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Automatic regulation

Subclass of:

315 - Electric lamp and discharge devices: systems

315291000 - CURRENT AND/OR VOLTAGE REGULATION

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Class / Patent application numberDescriptionNumber of patent applications / Date published
315309000 Thermal responsive regulator 58
315308000 Regulator responsive to plural conditions 26
315310000 Shunted impedance-type regulator 2
20100253245METHOD, SYSTEM AND CURRENT LIMITING CIRCUIT FOR PREVENTING EXCESS CURRENT SURGES - The present invention relates to a method, system and current limiting circuit configured to limit the excess output current passing through a load, said current limiting circuit comprising a resistor connected in series with said load and in parallel with a switch, which is initially turned OFF, wherein said switch is turned ON, thereby shorting said resistor, when the output voltage applied to said load is decreased by a predetermined level.10-07-2010
20110089868HARMONIC COMPENSATION CIRCUIT AND METHOD FOR AN LED LIGHT UNIT - The present invention relates to a harmonic compensation circuit for compensating at least the third harmonic in the input current (I04-21-2011
315311000 Variable impedance-type regulator 2
20130026952ILLUMINATION APPARATUS, ELECTRONIC BALLAST THEREIN AND METHOD FOR PROTECTING THE SAME - An electronic ballast includes an inverter circuit, a variable inductor unit and a control circuit. The variable inductor unit is electrically coupled between the inverter circuit and an illumination device. The control circuit controls the variable inductor unit according to an operation mode of the inverter circuit such that an equivalent inductance of the variable inductor unit has a variation fed back to the inverter circuit, to further change the operation mode of the inverter circuit. An illumination apparatus and a method for protecting the electronic ballast are also disclosed.01-31-2013
20120019170SEMICONDUCTOR LIGHT SOURCE LIGHTING CIRCUIT AND CONTROL METHOD - A semiconductor light source lighting circuit includes a transistor and a current detection resistor provided in series in a semiconductor light source current supply path, a control circuit for controlling the transistor so as to decrease any difference between the voltage occurring at the current detection resistor and a reference voltage, and a bypass resistor to establish a bypass path for the current supplied to the semiconductor light source, where a first end of the bypass path is located at a connection node between the transistor and the semiconductor light source.01-26-2012
Entries
DocumentTitleDate
20110199024SINGLE CHIP BALLAST CONTROLLER CAPABLE OF PROVIDING BRIGHTNESS LEVELS OVERVIEW AND BRIGHTNESS SETTING OF A FLUORESCENT LAMP - The present invention discloses a single chip ballast controller, capable of providing brightness levels overview and brightness setting of a fluorescent lamp during power-on period, having: a switching detection circuit, used to generate a set signal, which changes from an inactive state to an active state when a supply voltage falls below a threshold voltage; a time-varying reference voltage generator, used to generate a time-varying reference voltage varying between a first level and a second level during a power-on period, wherein the time-varying reference voltage can be fixed at a level by the active state of the set signal during the power-on period; and a gating signal generator, used to generate a high side driving signal and a low side driving signal according to an error voltage between the time-varying reference voltage and a current sensing voltage.08-18-2011
20100156325HIGH EFFICIENCY POWER CONDITIONING CIRCUIT FOR LIGHTING DEVICE - A power conditioning circuit in a light bulb efficiently converts an Alternating Current (AC) input voltage into Direct Current (DC) power for operating LEDs in the light bulb. The power conditioning circuit discharges capacitors when a voltage level of the input voltage drops below a given voltage necessary to operate the LEDs. The capacitors are then recharged when the input voltage is high enough to power the LED. The capacitors are configured to operate as voltage dividers while being charged thus reducing a peak voltage level of the output voltage used for powering the LEDs. The reduced output voltage reduces the overall amount of energy used by the light bulb and reduces the amount of heat radiated by the light bulb.06-24-2010
20130026951LED Dimming method and LED Dimming System - The present invention discloses a LED dimming method and a LED dimming system, wherein the LED dimming method comprises the following steps: A: calculating the equivalent current flowing through the LED in accordance with the duty cycle message of the input PWM signal; and B: regulating the current flowing through the LED to the equivalent current. Because the equivalent current flowing through the LED is calculated by the duty cycle message D of the input PWM signal while the duty cycle is not actually regulated, the present invention realizes the aim that the dimming uniformity is improved by linearly regulating the current flowing through the LED. Meanwhile, transformer noise will not be generated because current flows through the transformer in the overall dimming cycle.01-31-2013
20090195192SMART LIGHT - An intelligent light, such as a light for connecting with and receiving communications from a low voltage line, is provided. The intelligent light includes a power supply operable to generate a DC voltage from an input voltage communicated via a low voltage line by a power source, a receiver operable to extract a data pattern encoded in the input voltage; and output circuitry in communication with the DC voltage and the receiver operable to generate an output voltage to energize a light based on the data pattern to control operations of the light.08-06-2009
20090195191Perceptually linear LED brightness control - A current regulator includes a first current source to provide a reference current varying with a dimming step, and a second current source to generate a drive current for a white LED according to the reference current. The reference current and the dimming step have a relationship identical to or approximating a relationship between luminance and lightness perceived by human eyes. Thus, the white LED is controlled to have a linear variation of the luminance perceived by human eyes when the dimming step is changed.08-06-2009
20100052574BATTERY-POWERED OCCUPANCY SENSOR - A load control system comprises a load control device and a battery-powered occupancy sensor, which transmits a first wireless signal to the load control device in response to detecting the presence of an occupant in a space. The load control system further comprises a visual indicator for providing a visual indication when the magnitude of a battery voltage of a battery of the occupancy sensor has dropped below a predetermined low-battery voltage threshold. The occupancy sensor may comprise the visual indicator, such that the visual indicator is illuminated when the occupancy detects the presence of the occupant in the space and the magnitude of the battery voltage is less than the predetermined threshold. Alternatively, the load control device may comprise the visual indicator, such that the visual indicator is illuminated in response to receiving a second wireless signal, which is transmitting by the occupancy sensor when the magnitude of the battery voltage is less than the predetermined threshold.03-04-2010
20100148699CIRCUIT CONFIGURATION FOR OPERATING AT LEAST ONE DISCHARGE LAMP AND METHOD FOR GENERATING AN AUXILIARY VOLTAGE - A circuit arrangement for operating at least one discharge lamp may include: a first and a second input terminal for connecting a supply voltage; an inverter, which includes at least one first switch and one second switch, which are coupled in series between the first and the second input terminal and between which a bridge center point is defined; a drive circuit for at least the first switch and the second switch with an input for receiving a control signal; an apparatus for generating an auxiliary voltage. The apparatus may include: a first capacitor; a terminal for the provision of the auxiliary voltage, which terminal is coupled to a reference potential via the first capacitor; a two-state controller with a first input to which the control signal in inverted form is coupled, a second input, which is coupled to the terminal for the provision of the auxiliary voltage, and an output; a switch—with a control electrode, a working electrode and a reference electrode, the control electrode being coupled to the output of the two-state controller, the working electrode being coupled to the terminal for the provision of the auxiliary voltage; and a nonreactive resistor; wherein the apparatus for generating the auxiliary voltage furthermore includes a transformer with a primary winding and a secondary winding, the transformer being coupled to the first and the second input terminal, the terminal for the provision of the auxiliary voltage and the switch-in such a way that a current through the switch results in a current through the primary winding, in a current through the secondary winding and therefore in charging of the first capacitor.06-17-2010
20080258652Power control circuit for adjusting light - The present invention discloses a power control circuit for adjusting light, which adopts both frequency modulation and amplitude modulation for the control and starts using the amplitude modulation control after the frequency change exceeds a predetermined limit range, such that the voltage and frequency for driving the lamp set fall within a range acceptable to the lamp set and minimize the effect of frequency interferences.10-23-2008
20110193497CONTROL SYSTEMS - A lighting control system comprises an input for receiving a mains supply voltage; an output for providing an output voltage signal for powering plural lamps; a controller; a first transformer connected to the input and being for reducing the mains supply voltage to a reduced voltage; a second transformer having a secondary winding connected in series between the first transformer and the output and having a primary winding connected to the controller, the secondary and primary windings being arranged so as to induce a supplementary voltage in the secondary winding when said primary winding is energised. The controller is configured in a first phase, to provide a first energising signal to the primary winding of the second transformer such as to supplement the reduced voltage provided by the first transformer, thereby to provide an output voltage signal that is greater than the reduced voltage signal and in a second phase, immediately following the first phase, to cease to provide the first energising signal to the primary winding of the second transformer, thereby to provide an output voltage signal in the second phase that is different to the output voltage signal provided in the first phase The controller includes a control input for receiving a control signal from a user, for allowing a user to configure one or more parameters of the lighting control system.08-11-2011
20110193496CONTROL SYSTEMS - A lighting control system comprises an input for receiving a mains supply voltage; an output for providing an output voltage signal for powering plural lamps; a controller; a first transformer connected to the input and being for reducing the mains supply voltage to a reduced voltage; a second transformer having a secondary winding connected in series between the first transformer and the output and having a primary winding connected to the controller, the secondary and primary windings being arranged so as to induce a supplementary voltage in the secondary winding when said primary winding is energised. The controller is configured in a first phase to provide a first energising signal to the primary winding of the second transformer such as to supplement the reduced voltage provided by the first transformer, thereby to provide an output voltage signal that is greater than the reduced voltage signal; and in a second phase to short-circuit the primary winding of the second transformer, thereby to provide an output voltage signal substantially at the reduced voltage. The controller is configured in a third phase to provide a second energising signal to the primary winding of the second transformer such as to alter the reduced voltage provided by the first transformer, the second energising signal having a different voltage to the first energising signal, thereby to provide an output voltage signal in the third phase that is different to the output voltage signals provided in the first and second phases.08-11-2011
20110193495LIGHTING POWER SOURCE WITH CONTROLLED CHARGING OPERATION FOR DRIVING CAPACITOR - A lighting power source provides AC or DC power as needed to power an electric light source. A first switching element and a diode are coupled in series across output ends of a DC power source, with a second switching element coupled across the diode. An inductor forms an output loop with the diode. A driving capacitor has a first end coupled to a node between the first switching element and the diode. A charging power source is coupled to a second end of the driving capacitor and supplied with power from the DC power source. During a charging operation, a control circuit charges the driving capacitor by turning on the second switching element while maintaining the first switching element in an OFF state. During a normal operation which follows the charging operation the control circuit repeatedly turns on/off the first switching element while maintaining the second switching element in the OFF state.08-11-2011
20120176066PORTABLE LIGHTING DEVICE AND METHOD THEREOF - A portable lighting device includes a controller, a power source that provides a voltage, and a load that includes a light emitting diode (LED) light source. The controller receives the voltage and regulates a current of the LED light source based on a sensing signal indicating the voltage of the power source. The controller regulates the current of the LED light source to a first current level if the voltage of the power source is greater than a first voltage level, and to a second current level if the voltage of the power source is less than a second voltage level. The second voltage level is less than the first voltage level. The controller regulates the current of the LED light source to vary according to the sensing signal if the voltage of the power source is between the first voltage level and the second voltage level.07-12-2012
20130076266LASER DIODE DRIVER DAMPING CIRCUIT - A damping circuit having an input terminal and an output terminal is described. The damping circuit comprises a driver having an input and an output; an RC circuit coupled between the input terminal and the output; and a resistor coupled between the output and the output terminal, wherein the RC circuit delays passing a signal from the output terminal to the input terminal and a low impedance associated with the driver generally reduces ringing.03-28-2013
20090212721LED DRIVE CIRCUIT - An LED drive circuit includes a constant-current circuit that supplies a constant-current to an LED module to drive it; a thyristor; and a phase-angle control circuit which adjusts the ignition angle of the thyristor. The LED module, the constant-current circuit, and the thyristor are connected in series.08-27-2009
20130033197ISOLATED FLYBACK CONVERTER FOR LIGHT EMITTING DIODE DRIVER - An isolated flyback converter for an LED driver includes a snubber circuit unit connected to the primary side of a transformer; and a snubber voltage detection unit which detects a snubber voltage of the snubber circuit unit and generates a reference voltage proportional to the detected snubber voltage. Further, the isolated flyback converter includes a switching unit with a source terminal and a drain terminal, and may be turned on or off in response to an arbitrary logic signal. Furthermore, the isolated flyback converter includes a control unit which compares a voltage supplied through the switching current sensing resistor with the reference voltage, and supplies a logic signal at relatively high level or relatively low level to the switching unit to control the switching unit such that a secondary-side current of the transformer is maintained relatively constant.02-07-2013
20100052573LED REGULATION CIRCUIT AND METHOD - An LED regulation circuit and method include a voltage transformation unit to receive DC power and provide a constant current to drive at least one LED and a pulse-width modulation unit to generate a driving signal to control the voltage transformation unit. The driving signal of the pulse-width modulation unit has an operation period. In the operation period, the driving signal drives the voltage transformation unit to output regular operation power. The pulse-width modulation unit is connected to a timing regulation unit which generates a regulation signal sent to the pulse-width modulation unit to regulate the operation period of the driving signal by adding a sleep period. In the sleep period, the driving signal lowers the power of the voltage transformation unit that drives the LED. Through alternately controlling the operation period and sleep period of the driving signal, continuous heat generation and heat accumulation can be reduced.03-04-2010
20090179592UNI-DIRECTIONAL LIGHT EMITTING DIODE DRIVE CIRCUIT IN PULSED POWER NON-RESONANCE - The present invention uses the capacitive, inductive, or resistive impedance component to constitute the first impedance, and uses the inductive impedance component and capacitive impedance component which will not produce parallel resonance after parallel connection to constitute the second impedance, whereby the first impedance and the second impedance are series connected for inputting pulsed DC power, and the divided power generated at the two ends of the first or second impedance is rectified to drive the uni-directional light emitting diode.07-16-2009
20130038245FAST REIGNTION OF A HIGH INTENSITY DISCHARGE LAMP - Embodiments of the present invention provide for the rapid reignition of a high intensity discharge lamp. In one embodiment of the invention, an apparatus for a fast reigntion of a high intensity discharge lamp is disclosed. The apparatus is comprised of a ballast operatively coupled to the lamp that is configured to receive power from a power supply. The apparatus is also comprised of a timer circuit that enters a timing phase and produces a quantum of timing information when the lamp ceases receiving power from the power supply. This timer circuit does not require external power during the timing phase. The apparatus is additionally comprised of a control circuit that receives the timing information and permits the ballast to reignite the lamp based on the information.02-14-2013
20100109572HIGH-PRESSURE DISCHARGE LAMP BALLAST WITH RAPID LAMP RESTART CIRCUIT - An electronic ballast is provided for quickly restarting a high-pressure discharge lamp after shutdown. The ballast includes a power supply circuit for supplying power to the lamp from a commercial power source, a start voltage generation circuit for supplying a starting high voltage to the lamp and a control circuit for controlling the power supply circuit and the start voltage generation circuit. A lighting transition module detects a startup or shutdown of the lamp. A lighting time count module measures a lighting time of the lamp when startup is detected. A comparison module compares the lighting time and a first reference time when shutdown is detected. A delay time setting module sets a predetermined delay time of the start voltage generation circuit based on the comparison result. Operation of the ballast is halted from a startup trigger until lapse of the delay time, and then the high starting voltage is supplied to the lamp.05-06-2010
20100109571INSULATION TYPE AC-DC CONVERTER AND LED DC POWER SUPPLY DEVICE USING THE SAME - In an insulation type AC-dc converter in which input current from a commercial power supply is converted to obtain insulated direct current, the overall efficiency is raised and the structure is simplified. A multi-resonance type half-bridge DC-DC converter having an insulation transformer T is used as a first converter, and a boosting chopper circuit for power factor improvement is used as a second converter. Hence through multi-resonance operation, increases in losses can be suppressed even when the switching frequency is raised, and because a half-bridge circuit is used, switching elements and similar with lower voltage ratings can be employed, whereby overall efficiency can be increased. Moreover, a voltage substantially similar to the full-wave rectified waveform of the power supply voltage is obtained from the output capacitor at the boosting chopper circuit input, whereby there is no need for a feed-forward circuit across the insulation transformer, and moreover the electrolytic capacitor which had to be provided on the converter input side is unnecessary. This is advantageous for achieving miniaturization and a thin design.05-06-2010
20100109573DISCHARGE LAMP LIGHTING CIRCUIT - A discharge lamp lighting circuit facilitates carrying out re-ignition and addresses a problem than can arise due to an influence of a capacitor in an auxiliary lighting circuit. A driving voltage generating portion supplies an AC driving voltage to a discharge lamp to be a driving target. An auxiliary lighting circuit is provided on a terminal side of the discharge lamp. An auxiliary lighting capacitor, an auxiliary lighting resistor and a switch are provided in series between the terminal of the discharge lamp and a fixed voltage terminal. A control circuit controls a conducting state of the switch. The switch is brought into an ON state before the discharge lamp is turned ON, and is brought into an OFF state after the discharge lamp is turned ON.05-06-2010
20100109574ARRANGEMENT INCLUDING AN ELECTRONIC BALLAST AND DIMMING CONTROL APPARATUS CONNECTED THERETO, AND METHOD FOR OPERATING A LAMP - An arrangement is provided, including an electronic ballast having two terminals to which the electronic ballast applies voltage during operation, wherein the electronic ballast is configured to distinguish between different loads connected to the terminals and thus to obtain an analysis result, wherein it is configured to drive a lamp, which is connected to it, as a function of the analysis result; and a control apparatus, which is connected to the two terminals and draws energy for its operation via a voltage present at the two terminals, and which has a clock and can change the load, which is present between the two terminals, via an electronic controller as a function of information or signals provided by the clock.05-06-2010
20100320938METHOD OF DRIVING A GAS-DISCHARGE LAMP - The invention describes a method of driving a gas-discharge lamp (12-23-2010
20090045758Drive Circuit Supplying Current to Load Based on Control Signal, and Portable Information Terminal Including the Same - A drive circuit (02-19-2009
20130088171LED DRIVER HAVING NON-LINEAR COMPENSATION - A device driver which includes an input driver configured to produce a sequence of uncompensated drive signals along with compensation circuitry connected to receive the uncompensated drive signals and to produce corresponding compensated drive signals. The compensation circuitry is capable of storing two or less control points that define a single compensation curve such as a Bezier curve, with the compensation circuitry converting the uncompensated drive signals to the corresponding compensated drive signals utilizing the control points. An output driver is configured to drive a device such as one or more light emitting diodes to be connected to the output driver with the compensated drive signals.04-11-2013
20110001440LIGHT COLOR TUNABILITY - The application relates to setting color point and light intensity. By controlling the phase as well as the amplitudes of a driving voltage for a lighting device, the color point as well as the light intensity of a lighting device may be set.01-06-2011
20130049639LIGHT SOURCE APPARATUS - A constant-current power source unit has a variable power source which can adjust an output voltage. To detect a voltage applied to the gas discharge tube, a voltage detection unit is provided. A power source controlling unit configured to control the voltage by adding a predetermined voltage to the voltage taken in from the voltage detection unit after the electric discharge is started in the gas discharge tube.02-28-2013
20130088174ORGANIC EL ELEMENT DRIVING DEVICE AND ORGANIC EL LIGHTING APPARATUS - An organic EL element driving device that drives an organic EL element with a constant current is provided. The organic EL element driving device includes a power supply connected in series with the organic EL element, and a current control unit connected in series with the organic EL element. The current control unit includes a current detection circuit having a resistor for detecting the value of the current passing through the organic EL element. The current control unit sets a prescribed value for the current to be passed through the organic EL element in accordance with the luminance control, and performs control such that the current passing through the organic EL element has the prescribed value in accordance with an output from the current detection circuit. A value of the resistor in the current detection circuit is varied in accordance with the luminance control.04-11-2013
20130088173POWER SUPPLY DEVICE AND LIGHTING EQUIPMENT - In a power supply device according to one embodiment, a reference signal Vref04-11-2013
20130088172SEMICONDUCTOR LIGHT SOURCE LIGHTING CIRCUIT - A circuit for lighting a semiconductor light source is provided. The circuit includes: a switching regulator including a switching element and configured to generate a drive current for the semiconductor light source using the switching element; and a control circuit configured to control on-off of the switching element such that the magnitude of the drive current comes close to a targeted value. The control circuit includes: a comparator configured to compare the magnitude of the drive current with the targeted value; an up/down counter configured to count a digital value in a counting-up direction or counting-down direction, based on a comparison result of the comparator; a digital-to-analog converter configured to convert the counted digital value into an analog signal; and a drive circuit configured to control on/off of the switching element based on the analog signal.04-11-2013
20130088170DRIVING CIRCUIT OF LIGHT EMITTING DIODE AND LIGHT SOURCE APPARATUS - A driving circuit of a light emitting diode (LED) capable of receiving a power source to supply a driving current to an LED module is provided. The driving circuit includes a first current path and a second current path. The first current path includes a switch. The switch is disposed between the LED module and a terminal. The switch has a control terminal and receives a control signal through the control terminal so as to control whether the LED module is coupled to the terminal via the switch. The second current path is coupled between the LED module and the terminal. The second current path includes an impedance unit and is coupled to the first current path in parallel.04-11-2013
20090302784High pressure Discharge Lamp - A high-pressure discharge lamp with a discharge vessel comprising electrodes; at least one noble gas as starting gas; at least one element selected from the group consisting of Al, In, Mg, Tl, Hg, Zn for arc transfer and discharge vessel wall heating; and at least one rare-earth halide for the generation of radiation. The lamp is designed in such a way that the light generated is dominated by molecular radiation.12-10-2009
20090302783LED ILLUMINATION SYSTEM WITH MULTIPLE INDEPENDENT LOOPS - A LED illumination system with multiple independent loops includes an input unit provided to receive a D.C. voltage, and a plurality of light module control circuits electrically connected to the input unit. Each of the light module control circuits includes a light module controller and two filtering units. The two filtering units are electrically connected to the light module controller, and receive D.C. power transmitted form the input unit to drive two set of LED illuminators, respectively. The light module controller controls current of the two set of LED illuminators via the two filtering units so as to control brightness of the LED illuminators, respectively. Therefore, the LED illuminators are controlled by the independent loops to reduce mutual influence among the LED illuminators.12-10-2009
20130057180METHOD AND APPARATUS FOR DETECTING AND CORRECTING IMPROPER DIMMER OPERATIOIN - A method is provided for detecting and correcting improper operation of a lighting system including a solid state lighting load. The method includes detecting first and second values of a phase angle of a dimmer connected to a power converter driving the solid state lighting load, the first and second values corresponding to consecutive half cycles of an input mains voltage signal, and determining a difference between the first and second values. When the difference is greater than a difference threshold, indicating asymmetric waveforms of the input mains voltage signal, a selected corrective action is implemented.03-07-2013
20090091272PROJECTION-TYPE IMAGE DISPLAY APPARATUS, LIGHTING APPARATUS AND LIGHTING METHOD REALIZING AN EXTENDED LIFETIME - A projection-type image display apparatus includes a high pressure discharge lamp, which utilizes the halogen cycle, and a lamp lighting apparatus that controls lighting of the high pressure discharge lamp. The lamp lighting apparatus performs lamp refresh processing to improve a lamp property. The lamp refresh processing involves performing low power lighting of the high pressure discharge lamp by changing the lighting power of the high pressure discharge lamp to a value that is lower than the rated power, and thereafter performing high power lighting of the high pressure discharge lamp by changing the lighting power to a value that is higher than the lighting power during the low power lighting.04-09-2009
20120187869POWER SUPPLY DEVICE - In various embodiments, an electrical power supply device may include a transformer with a primary winding having coupled thereto a main switch switchable on and off to connect and disconnect said primary winding from a supply source and a secondary winding having coupled therewith a main branch for feeding a load and at least one auxiliary branch to provide an auxiliary power supply; wherein said at least one auxiliary branch includes a switching regulator with hysteresis with a respective auxiliary switch sensitive to the voltage on said secondary winding and the voltage of said auxiliary power supply, said auxiliary switch configured for closing to draw current from said main branch toward said auxiliary power supply in the presence of a negative transition of the voltage on said secondary winding and for opening when the voltage on said auxiliary power supply reaches an upper reference level.07-26-2012
20090267541LED LAMP CONTROL CIRCUIT HAVING POWER SAVING FUNCTION AND POWER SAVING CONTROL METHOD THEREOF - A light emitting diode (LED) lamp control circuit having power saving function includes a control switch, a LED lamp, a battery, and a controller. The battery is connected to the LED lamp to supply power via the control switch. The controller is connected to the control switch and the battery to detect voltage values of the battery and control the control switch. The controller outputs different control signals to control the switching time of the control switch to drive the LED lamp to emit light at different intensity according to the voltage value of the battery.10-29-2009
20120223658LAMP AND LUMINAIRE WITH AT LEAST ONE LIGHT EMITTING DIODE - In various embodiments, a lamp is provided. The lamp may include at least one light emitting diode; a housing, which comprises at least a first housing part and a second housing part, wherein the first housing part is arranged movably relative to the second housing part; a motion detection sensor for detecting a magnitude of a movement of the first housing part relative to the second housing part; and a radiation modification apparatus for modifying at least one parameter of the radiation emitted by the at least one light emitting diode, the radiation modification apparatus being coupled to the motion detection sensor, the radiation modification apparatus being designed to modify the radiation to be emitted by the at least one light emitting diode depending on the detected magnitude of the movement.09-06-2012
20110012536ELECTRONIC BALLAST WITH DIMMING CONTROL FROM POWER LINE SENSING - The present invention discloses an electronic ballast with dimming control from power line sensing for a fluorescent lamp, comprising: a control voltage generator, used to generate a control voltage according to a switching count of a power line; an oscillator, used to generate an oscillating signal, wherein the oscillating signal is of a fixed frequency and has a rising voltage portion and a falling voltage portion; and a comparator, used to generate a high side gating signal according to voltage comparison of the oscillating signal and the control voltage.01-20-2011
20110012535PORTABLE LIGHTING DEVICES - A portable lighting device and method of operating the portable lighting device are disclosed. The portable lighting device is configured to operate using a portable source of power having a plurality of modes of operation. The portable lighting device comprises a main power circuit including a light source, an inertial sensor having a plurality of signal outputs, and a controller electrically connected to the outputs of the inertial sensor and the main power circuit in a manner to permit the controller to enter into a new mode of operation based on signals received from the outputs of the inertial sensor. One method of operating the portable lighting device is by positioning the portable lighting device to one of a plurality of predetermined positions to enter into one of a plurality of modes of operation. Each of the plurality of predetermined positions is associated with one of the plurality of modes of operation.01-20-2011
20110012534PORTABLE LIGHTING DEVICES - A portable lighting device and method of operating the portable lighting device are disclosed. The portable lighting device is configured to operate using a portable source of power having a plurality of modes of operation. The portable lighting device comprises a main power circuit including a light source, an inertial sensor having a plurality of signal outputs, and a controller electrically connected to the outputs of the inertial sensor and the main power circuit in a manner to permit the controller to enter into a new mode of operation based on signals received from the outputs of the inertial sensor. One method of operating the portable lighting device is by positioning the portable lighting device to one of a plurality of predetermined positions to enter into one of a plurality of modes of operation. Each of the plurality of predetermined positions is associated with one of the plurality of modes of operation.01-20-2011
20130063047Load Control Device for a Light-Emitting Diode Light Source - An LED driver for controlling the intensity of an LED light source includes a power converter circuit for generating a DC bus voltage, an LED drive circuit for receiving the bus voltage and controlling a load current through, and thus the intensity of, the LED light source, and a controller operatively coupled to the power converter circuit and the LED drive circuit. The LED drive circuit comprises a controllable-impedance circuit adapted to be coupled in series with the LED light source. The controller adjusts the magnitude of the bus voltage to a target bus voltage and generates a drive signal for controlling the controllable-impedance circuit. To adjust the intensity of the LED light source, the controller controls both the magnitude of the load current and the magnitude of the regulator voltage. The controller controls the magnitude of the regulator voltage by simultaneously maintaining the magnitude of the drive signal constant and adjusting the target bus voltage.03-14-2013
20090237009DISCHARGE LAMP LIGHTING DEVICE, CONTROL METHOD THEREOF, AND PROJECTOR - A discharge lamp lighting device includes: a power control circuit outputting DC current; an AC conversion circuit generating and outputting discharge lamp driving AC current by inverting the polarity of the DC current at a predetermined timing; a control circuit performing an AC conversion control process of controlling a polarity inversion timing of the discharge lamp driving AC current on the AC conversion circuit and performing an interval current control process of controlling a current value of the DC current every polarity inversion timing interval on the power control circuit; a detection unit detecting a discharge lamp driving voltage at the time of normal lighting; a history information storage periodically storing history information of the detected discharge lamp driving voltage, a statistics processing unit statistically processing the stored history information every predetermined period; and a statistical information storage storing information having been subjected to the statistical process as statistical information. Here, the control circuit sets and controls at least one of a frequency, a duty ratio, and a waveform of the discharge lamp driving AC current on the basis of a time-dependent tendency of the statistical information.09-24-2009
20130127371CMOS Bootstrap Circuit For DC/DC Buck Converter Using Low Voltage CMOS Diode - A modified bootstrap circuit utilized, for example, in a high voltage DC/DC CMOS buck converter to convert a high input voltage (e.g., 24V) to a regulated voltage (e.g., 4V) for use, for example, by an LED driver circuit. The bootstrap circuit utilizes a feedback diode and a PMOS switch to avoid high reverse diode voltages across a low voltage bootstrap diode. A bootstrapped buck converter implements the bootstrap circuit to generate a high gate voltage on a high-side NMOS switch during all operating phases. The PMOS switch is controlled by the NMOS switch's output voltage to pass a system voltage (e.g., 5V) through the bootstrap diode whenever the output voltage drops low (e.g., 0V), and to shut off when the output voltage subsequently rises such that the feedback diode forward biases to pass the output voltage to the anode of the bootstrap diode.05-23-2013
20110012537Driver circuit and method for driving load circuit - The present invention discloses a driver circuit and a method for driving a load circuit. The driver circuit includes: a primary side circuit receiving rectified AC power; a transformer coupled to the primary side circuit and converting a primary voltage to a secondary voltage which is supplied to a load circuit; and a secondary side circuit coupled to the transformer, the secondary side circuit detecting current flowing through the load circuit and feedback controlling the primary side circuit accordingly.01-20-2011
20120235599LIGHTING DEVICE AND METHOD FOR ADJUSTING SENSING REGION THEREOF - A lighting device and a method for adjusting the sensing region thereof are provided. The lighting device includes a sensing device and an illumination unit. The sensing device is configure to detect whether an object is located at a first manipulating region or a second manipulating region so as to correspondingly emit a control signal, in which the first manipulating region and the second manipulating region are not overlapped by each other and are disposed in the sensing region along a sensing direction of the sensing device. The sensing device adjusts a shortest distance between the sensing region and the sensing device and a sensing range of the sensing region according to a first adjustment signal and a second adjustment signal. The illumination unit is coupled to the sensing device and adjusts the optical characteristic according to the control signal.09-20-2012
20080315794METHOD AND FIRMWARE FOR GENERTING A DIGITAL DIMMING WAVEFORM FOR AN INVERTER - A method and firmware for method of generating a digital dimming waveform for an inverter includes steps of receiving programmable parameters as input to firmware in an inverter voltage microcontroller including a soft start duration, a restrike voltage, a restrike duration, a recovery duration, a sustaining voltage, a dimming duty cycle, and an inverter frequency; and generating by firmware in the inverter voltage microcontroller a first portion of a pulse-width modulated digital switch control signal having a frequency equal to the inverter frequency and a duty cycle that varies from a first value to a second value during a time interval equal to the soft start duration.12-25-2008
20110279062DC POWER SUPPLY UNIT AND LED LIGHTING APPARATUS - In one embodiment, a DC power supply unit includes a DC power supply source; a load circuit connected to an output end of the DC power supply source; a load state detection device to detect a load voltage or an electric quantity corresponding to the load voltage; and a control device to receive the detected output of the load state detection device. The control device controls a maximum output voltage of the DC power supply source so that the voltage difference between the maximum output voltage of the DC power supply source and the load voltage at the time of normal operation falls within a predetermined range in which arc discharge is suppressed.11-17-2011
20110279061FEEDBACK CONTROL CIRCUIT AND POWER CONVERTING CIRCUIT - An exemplary embodiment of the invention provides a set of an initial value of an error amplifying signal in the feedback control circuit for feedback control, so as to reduce the time and the amplitude of oscillation of the error amplifying signal. Accordingly, a feedback control circuit and a power converting circuit provided in an exemplary embodiment of the invention not only reduce the degree and the time of overshoot but also provide accurate and stable feedback control.11-17-2011
20090160367POWER SUPPLY, LIGHT EMISSION CONTROL DEVICE AND DISPLAY DEVICE - The power supply of the present invention is composed of: a charge pump circuit (06-25-2009
20130162174DRIVING CIRCUIT AND OPTICAL CONNECTOR HAVING SAME - A driving circuit for driving a light source of an optical connector includes a controller, an equalizer, a pseudo-random binary sequence (PRBS) generator, and a driver. The controller controls the driving circuit such that the light source is driven to emit by the driver according to an input signal sending into the equalizer for transmitting the input signal or a PRBS test signal generated by the PRBS generator for test a bit error rate of the optical connector.06-27-2013
20110031899DIMMABLE LED DEVICE WITH LOW RIPPLE CURRENT AND DRIVING CIRCUIT THEREOF - A dimmable light emitting diode (LED) device with low ripple current includes a LED module, a phase dimmer, a voltage converting module, a driving module and a feedback module. The flyback converter of the voltage converting module adds a secondary forward winding connecting to a phase cut-off detector to provide a detecting voltage in proportion to current level of the output current across the LED module.02-10-2011
20100171443INDUCTION LAMP WITH BRIGHTNESS ADJUSTMENT CAPABILITY - An induction lamp includes a brightness control module, an induction unit, a register, and an illuminating unit. The brightness control module, the induction unit, the register, and the illuminating unit are electrically connected to each other in that order. When the induction unit detects a control signal from a user, the induction unit sends a detecting signal to change an address of the register, and the brightness control module controls a brightness of the illuminating unit depending on the address of the register.07-08-2010
20090066265INVERTER - A soft start circuit generates a soft start voltage Vss which changes with time at a starting time of lighting an EEFL. A pulse width modulator generates a PWM signal Vpwm whose duty ratio is feedback-controlled so that a feedback voltage Vfb corresponding to an output voltage Vdrv of an inverter conforms to the soft start voltage Vss. A logical control unit performs switching control of a voltage of a primary coil of a transformer on the basis of the PWM signal Vpwm from the pulse width modulator. The soft start circuit executes at least one striking operation in which the soft start voltage Vss is raised with time, lowered when being reached to a first voltage level VH, and raised again when being lowered to a second voltage level VL lower than the first voltage level VH.03-12-2009
20120112667Controlling Intensity of a Light Through Qualified Motion Sensing - Methods and apparatuses for controlling light intensity of a light through motion sensing are disclosed. One method includes sensing a first instance of motion. The light is activated only if consecutive instances of motion are sensed, wherein each instance is sensed within a gap of time of a previously sensed instance of motion, and the consecutive instances of motion being sensed span an entire window of time after sensing the first instance of motion. One apparatus includes a motion sensor for sensing a first instance of motion. The apparatus further includes a controller interfaced to the motion sensor and the light, the controller operative to activate the light only if consecutive instances of motion are sensed, wherein each instance is sensed within a gap of time of a previously sensed instance of motion, and the consecutive instances of motion being sensed span an entire window of time after sensing the first instance of motion.05-10-2012
20130162175DRIVE VOLTAGE GENERATION CIRCUIT FOR LIGHT EMITTING DIODE DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME - A drive voltage generation circuit for an LED display device capable of increasing the input voltage range thereof is disclosed. The drive voltage generation circuit includes a booster that boosts an input voltage from an external source, to generate a boosted voltage, a protection switching element that controls whether or not the boosted voltage generated from the booster is to be output, in accordance with a switch control signal, a protection circuit that compares a level of the boosted voltage output from the booster via the protection switching element with a predetermined threshold voltage, selects one of a high voltage and a low voltage, based on a result of the comparison, and outputs the selected voltage as the switch control signal, and a discharger that discharges a low voltage node, to which the low voltage is applied.06-27-2013
20120007524Terminal Device and Computer-Readable Storage Medium - A terminal apparatus and a computer-readable storage medium capable of achieving reduction of power consumption by appropriately controlling lighting of a display unit are provided.01-12-2012
20110285323DRIVING CIRCUIT WITH DIMMING CONTROLLER FOR DRIVING LIGHT SOURCES - A dimming controller for controlling dimming of a light-emitting diode (LED) light source includes a monitoring terminal and a control terminal. The monitoring terminal receives a switch monitoring signal indicative of an operation of a power switch which transfers power from an AC power source to a bridge rectifier when the power switch is on. A power converter receives input power from the bridge rectifier and provides output power to the LED light source. The control terminal generates a control signal to adjust the output power according to the switch monitoring signal so as to control dimming of the LED light source.11-24-2011
20110285322GAS-DISCHARGE LAMP CONTROLLER UTILIZING A NOVEL PREHEATING PHASE CONTROL MECHANISM - A gas-discharge lamp controller utilizing a novel preheating phase control mechanism, having: a supply voltage tracking reference voltages generator, biased between a supply voltage and a reference ground, for generating a first reference voltage which is proportional to the supply voltage; and a control unit, for generating a high threshold signal according to the first reference voltage and a saw-tooth signal, the peak value of the saw-tooth signal being proportional to the supply voltage, wherein the control unit has a preheating phase, the high threshold signal is coupled with the first reference voltage during the preheating phase, and the time duration of the preheating phase is set by a predetermined number of periods of the saw-tooth signal.11-24-2011
20110285321LIGHT SOURCE DRIVING CIRCUIT WITH LOW OPERATING OUTPUT VOLTAGE - A driving circuit for regulating current in a light source using a tracking component. The tracking component detects the voltage difference between an input node in the input stage and an output node in the output stage. The input stage is connected to a current source and includes an input transistor. The output stage is connected to the light source and includes an output transistor. The tracking component generates an output that controls the input and output transistors based on the voltage difference between the input node and the output node so that the voltage at the input node tracks the voltage at the output node. By using the tracking component, the LED driver can achieve accurate current control through one output transistor instead of cascaded transistors, resulting in lower output operating voltage and reduced power dissipation of the LED driver. Further, the tracking component is intermittently operated or shared across different channels to reduce energy consumption of the LED driver.11-24-2011
20090284182Method For Dimming Non-Linear Loads Using An AC Phase Control Scheme And A Universal Dimmer Using The Method - A universal dimmer for adjusting the output from linear and non-linear loads using an AC power control method incorporating phase angle control is disclosed which has a switching element, a load current measurement element for measuring the current passing through the load, a current evaluator for evaluating the current passing through the load, and a firing angle adjuster such as a regulator or transforming element. The current passing through the load is measured and evaluated so as to direct the firing angle adjuster to adapt firing angles of the switching element in such way that a load RMS current is proportional to an input signal to the dimmer, regardless of the type of load being controlled. The universal dimmer is capable of dimming the output from linear and non-linear loads using a variable power delivery method using AC power line phase angle control to vary output power of linear and non-linear loads, ranging from regular linear loads such as incandescent lamps, to non-linear loads, such as LED lamps, compact fluorescent lights (CFLs'), etc. as well as linear loads with large phase shift, that is, inductive and capacitive loads.11-19-2009
20110291593Fast Reignition of a High Intensity Discharge Lamp - Embodiments of the present invention provide for the rapid reignition of a high intensity discharge lamp. In one embodiment of the invention, an apparatus for a fast reigntion of a high intensity discharge lamp is disclosed. The apparatus is comprised of a ballast operatively coupled to the lamp that is configured to receive power from a power supply. The apparatus is also comprised of a timer circuit that enters a timing phase and produces a quantum of timing information when the lamp ceases receiving power from the power supply. This timer circuit does not require external power during the timing phase. The apparatus is additionally comprised of a control circuit that receives the timing information and permits the ballast to reignite the lamp based on the information.12-01-2011
20120098463PRIMARY-SIDE REGULATION OF OUTPUT CURRENT IN A LINE-POWERED LED DRIVER - A line-powered LED driver is operable to provide primary-side regulation of output current supplied to LED circuitry. The circuit includes a feedback loop coupled to a power converter, wherein the feedback loop adds scaled input current to scaled input voltage to produce a control signal. The power converter is responsive to the control signal to adjust input current drawn by the power converter in response to changes in line voltage to provide constant input power. The power converter produces output power for supplying constant output current at the LEDs. The feedback loop may use a reference voltage derived from the LED circuitry so that the output power may be regulated to provide constant LED current for varying LED voltages. When compared to secondary-side current feedback schemes, the LED driver provides increased efficiency and reliability at a reduced cost by implementing primary-side regulation of the output current.04-26-2012
20090085501CONSTANT CURRENT DRIVER CIRCUIT WITH VOLTAGE COMPENSATED CURRENT SENSE MIRROR - A current sensing circuit for sensing the current provided to LEDs by a constant current power source includes a resistive shunt in series with the load and a current mirror having a first leg connected to a first terminal of the resistive shunt and a second leg connected to a second terminal of the resistive shunt. Both legs of the current mirror are also connected to ground. The first leg provides a reference signal to the second leg, and the second log uses the reference signal and a voltage at the second terminal of the resistive shunt to provide a ground referenced output signal indicative of the current provided to the LEDs.04-02-2009
20080309257Diode lamp for simulating a filament lamp, and lamp monitoring method - An LED-based lamp assembly or diode lamp assembly effectively replaces a filament or incandescent type lamp assembly for cabin/compartment reading light applications for reducing power consumption and improving fuel efficiency. The diode lamp assembly comprises a light-emitting diode in circuit with peripheral components for effecting or simulating a low resistance through the diode lamp assembly. The simulation of a low resistance via the diode lamp assembly appears the same as the normal operation of a filament lamp assembly to existent circuit polling mechanisms so that the latter need not be replaced. Rather, the targeted element to be replaced is a relatively high power consumption filament lamp. A lamp monitoring method is further disclosed as bootstrap-supported by the teaching of the diode lamp assembly.12-18-2008
20080309256INTEGRATED CIRCUIT CONTROLLER FOR BALLAST - The present invention provides an integrated circuit controller for ballast with preheat/repreheat filament and ignition time control. A charge/discharge circuit is connected to a capacitor to provide the charge/discharge path for the capacitor. It charges when integrated circuit controller without errors and discharges when error occurred during lamp operation or power tripped. A control circuit is coupled to the charge/discharge circuit to control the charge/discharge circuit to charge or discharge the capacitor. A compare circuit is coupled to the charge/discharge circuit to compare a voltage signal on the capacitor from the charge/discharge circuit with threshold voltages for timing control and providing a preheat signal and an ignition signal. A control logic circuit is coupled to the control circuit to control the control circuit and coupled to the compare circuit to receive the preheat signal and the ignition signal for preheating the filament and igniting the lamp. The control logic circuit further receives a feedback voltage for over voltage protect. Once the feedback voltage is over its threshold voltage in the control logic circuit, the control logic circuit controls the control circuit for discharging the capacitor.12-18-2008
20090102399Backlight led drive circuit - A backlight LED drive circuit 04-23-2009
20090189547Lighting Device and Method of Control Based on Chemistry Composition of Power Source - A lighting device is generally illustrated having a light body having forward facing light sources including a visible white light source, visible colored light source and an infrared light source. Additionally, a side facing light source is provided. The light body also includes switches for activating the visible light sources and a three-position switch for activating the IR light source and the side facing light source. The light source of the lighting device may further be controlled based on a detected chemistry composition of the power source.07-30-2009
20090189548Lighting Device Having Boost Circuitry - A lighting device is generally illustrated including a light body having forward facing light sources including a visible white light source, visible colored light source and an infrared light source. Additionally, a side facing light source is provided. The light body also includes switches for activating the visible light sources and a three-position switch for activating the IR light source and the side facing light source. The lighting device further includes boost circuitry for controlling electrical energy supplied to a light source.07-30-2009
20090189545ELECTRONIC BALLAST WITH TRANSFORMER INTERFACE - An electronic ballast with transformer interface communicating between an external control system and the electronic ballast comprises an outboard circuit (07-30-2009
20090189546LED DIMMING CONTROL CIRCUIT - A LED dimming control circuit that avoids a higher output voltage than expected is provided. The LED dimming control circuit comprises an inductor, a transistor, a dimming control signal, a feedback signal, a switching control circuit, an error amplifier, and an inverted amplifier. The inductor and the transistor are coupled to a node. The switching control circuit is controlled by the dimming control signal and the feedback signal. The transistor is controlled by the switching control circuit. The output terminal of the error amplifier and the non-inverted input terminal of the error amplifier form a negative feedback path via the inverted amplifier.07-30-2009
20090179591UNI-DIRECTIONAL LIGHT EMITTING DIODE DRIVE CIRCUIT IN PULSED POWER PARALLEL RESONANCE - The present invention uses the capacitive, inductive, or resistive impedance component to constitute the first impedance, and uses the inductive impedance component and capacitive impedance component which produce parallel resonance after parallel connection to constitute the second impedance, whereby the first impedance and the second impedance are series connected for inputting pulsed DC power, and the divided power thereof is rectified to drive the uni-directional light emitting diode.07-16-2009
20100270948DIMMER AND LIGHTING APPARATUS - A dimmer and a lighting apparatus are provided. The dimmer apparatus includes a rectifier unit, a controller, a voltage divider and a voltage converter. The rectifier unit rectifies an AC power and generates a first operating voltage. The voltage divider outputs a voltage division of the first operating voltage. The controller integrates the voltage division to obtain an average voltage, and provides a pulse width modulation (PWM) signal based on the average voltage. The voltage converter drives a light emitting diode (LED), and adjusts a driving voltage and a driving current of the LED according to the PWM signal. Wherein, the controller also adjusts the PWM signal according to a feedback signal generated by the voltage converter.10-28-2010
20090096389DC/DC CONVERTER - A control circuit of a DC/DC converter is provided for supplying a driving voltage to a light emitting element. A hysteresis comparator compares a detection voltage that corresponds to the output voltage of the DC/DC converter with two threshold voltages. If the detection voltage is smaller than the lower threshold voltage, the hysteresis comparator outputs a comparison signal at the low level. Otherwise, the comparison signal is set to the high level. The switching control unit uses the comparison signal as a reference. The switching control unit instructs the switching transistor of the DC/DC converter to perform the switching operation during a period when the comparison signal is at the low level. Otherwise, the switching operation is suspended. The control circuit inhibits light emission of the light emitting element during a period when the comparison signal is at the low level. Otherwise, the control circuit permits the light emission.04-16-2009
20100295477METHOD FOR OPERATING A GAS DISCHARGE LAMP AND A GAS DISCHARGE LAMP DRIVER SYSTEM - In a method and circuit for operating a gas discharge lamp, the physical processes occurring in the gas discharge lamp are determined in order to control the behavior, and thus the light output, of the gas discharge lamp. Thereto, the method comprises the steps of, and the circuit comprises means for, providing an operating current to the gas discharge lamp and determining an operating parameter of the gas discharge lamp. Based on the determined operating parameter a value of a physical lamp parameter of the gas discharge lamp is determined. Using the determined value of the physical lamp parameter and a corresponding mathematical model of a physical process occurring in the gas discharge lamp an operating state of the gas discharge lamp is estimated. Using the model, which is based on the physical principles of the processes occurring in the gas discharge lamp, it is possible to determine the physical state of the gas discharge lamp. Consequently the operating current supplied to the gas discharge lamp may be controlled based on the determined operating state of the gas discharge lamp.11-25-2010
20090309516PIXEL AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - A pixel capable of compensating for the threshold voltage of a driving transistor, the voltage drop of a first power source and degradation of an organic light emitting diode is provided. The pixel includes an organic light emitting diode; a second transistor (e.g., a driving transistor) coupled between the first power source and the organic light emitting diode to control the current supplied to the organic light emitting diode; a third transistor coupled between a first electrode of the second transistor and the first power source; a first transistor coupled between a gate electrode of the second transistor and a data line; a first capacitor coupled between the gate electrode and the first electrode of the second transistor; a second capacitor coupled between the first electrode of the second transistor and the first power source; and a compensation circuit coupled between the organic light emitting diode and the gate electrode of the second transistor for adjusting a voltage of the gate electrode of the second transistor in accordance with degradation of the organic light emitting diode.12-17-2009
20100084994Energy-saving drive device for controlling an led heat dissipation temperature - An energy-saving drive device for controlling an LED heat dissipation temperature wherein, when the device converts signal voltage into operating energy for control, a feedback signal voltage is obtained at the LED load terminal. Meanwhile, the signal voltage is continuously compared by the calculus processor. Moreover, the oscillation waveform, the amplitude voltage, and the linearity of waveform are controlled by at least 3 times of software modulation to automatically offset and amplify the attenuated signal voltage and to enable the power amplifier to output a new operating voltage signal for correcting the voltage and the current, thereby driving the LED of high luminance and high power in the conditions of low voltage and low current depending on a load characteristic of the LED for achievement of the efficiency of energy conservation, no issue on overheating, and the virtues of safety and environmental protection.04-08-2010
20100283411LIGHT EMITTING DIODE DRIVING DEVICE AND METHOD THEREOF - A light emitting diode (LED) driving device and an LED driving method thereof are provided. The LED driving device includes a voltage generator, a circuit and a compensation circuit. The voltage generator is used to provide a positive voltage and a negative voltage, and the circuit is coupled to the positive voltage and the negative voltage. Herein, the circuit includes a load and an LED which are coupled to each other in series. The compensation circuit is used to sense voltages of two ends of the load, so as to generate a compensation signal and adjust the positive voltage and the negative voltage through the compensation signal. Therefore, voltage stress of the LED driving device is reduced by using the provided positive voltage and the provided negative voltage.11-11-2010
20110062894COLD CATHODE FLUORESCENT LAMP DRIVING CIRCUITS AND ASSOCIATED METHODS OF CONTROL - Methods and circuits for CCFL driving circuit control are disclosed according to various embodiments of the present disclosure. In certain embodiments, the methods and circuits for CCFL driving circuit control provide a control signal for regulating both the duty ratio and frequency of the switching control signal that controls the CCFL driving circuit. External components for control loop compensation and frequency sweeping rate, and/or striking frequency setting may also be utilized.03-17-2011
20110062892DRIVING DEVICE FOR A LIGHT EMITTING DIODE CIRCUIT AND RELATED LIGHTING DEVICE - A driving device for an LED circuit includes a power receiving terminal, a capacitor, and a light adjusting unit. The power receiving terminal is coupled to a switch for receiving a DC power source that supplies for the LED circuit and the driving device via the switch. The capacitor is coupled to the power receiving terminal, and is utilized for storing energy. The light adjusting unit is coupled to the power receiving terminal and the capacitor, and is utilized for generating a control signal according the status of the switch when a voltage on the capacitor decreases and does not decrease below a first threshold voltage, for adjusting light intensity of the LED circuit.03-17-2011
20100079090Light Emitting Driver Circuit with Compensation and Method - A light emitting driver circuit, system, and method are provided. The driver circuit system and method can be implemented in various ways. An embodiment includes a bypass circuit which diverts current from the LEDs whenever a switch coupled to the LEDs incurs residual current when turned off. In an additional or alternative embodiment, the residual current can be sensed and the amount of residual current used to trigger fetching of a compensation value. That compensation value can change a dimming function forwarded to the switch in order to compensate for, offset, or substantially eliminate the residual current through that switch.04-01-2010
20090206776LED DRIVE CIRCUIT AND LED ILLUMINATION DEVICE USING SAME - An LED drive circuit includes a resistor for setting a constant current, a switching power supply circuit for outputting a DC output voltage and a constant-current power supply circuit that receives the DC output voltage and that outputs the constant current to drive the LED. The LED drive circuit reduces, in dim light mode in which the LED is driven by a current less than that in normal light mode, at least one of the oscillation frequencies of an oscillation circuit included in the switching power supply circuit and an oscillation circuit included in the constant-current power supply circuit as compared with the normal light mode.08-20-2009
20100090618DIMMABLE LIGHTING SYSTEM - A lighting system for operation with a dimmer circuit comprising a triac connected to a load. The load comprises a driver circuit for supplying current to a light source comprising one or more LEDs, the current being determined at least in part by an adjusted setpoint value. The system further comprises a setpoint filter circuit for obtaining a dimmer setpoint value determined at least in part by a setting of the dimmer circuit, and for generating an adjusted setpoint value. The sensitivity of the adjusted setpoint value to changes in the dimmer setpoint value is low at low values of the dimmer setpoint value.04-15-2010
20090212720LIGHT EMITTING DIODE DRIVING SYSTEM - An exemplary light emitting diode driving system includes a protective circuit, a rectifying circuit, a driving circuit, a light emitting diode module and a detecting circuit. The protective circuit, the rectifying circuit, the driving circuit and the light emitting diode module are connected in series. The driving circuit is configured for driving the light emitting diode to emit light. The detecting circuit has predetermined voltages or current values stored therein. The detecting circuit detects the respective voltage or current of the protective circuit, the rectifying circuit and the driving circuit, and compares the respective voltage or current with the predetermined voltages or currents.08-27-2009
20080315795AMPLIFICATION CIRCUIT AND HEAT SINK USED WITH A LIGHT EMITTING APPARATUS HAVING VARYING VOLTAGES - A light emitting apparatus for regulating a current output of an LED at predetermined value with a power source having a wide variety of voltages and chemistries is described. A light emitting diode is electrically coupled to the voltage source. A pulse width modulation controller controls a duty cycle of the voltage applied. A resistor electrically coupled between the voltage source and the light emitting diode is used to regulate output current for the LED. An amplification circuit is electrically coupled to the resistor and the pulse width modulation controller for supplying a feedback voltage to the pulse width modulation controller that is higher than a voltage measured across the resistor.12-25-2008
20110169426Fluorescent Lamp Power Supply - Various embodiments of a fluorescent lamp power supply are disclosed herein. In one embodiment, a power supply includes a power input connected to a pulse generator. The power supply also includes a filter connected to a variable pulse width output on the pulse generator and to the power input. The filter is adapted to substantially block at least one harmonic frequency component of the variable pulse width output and to substantially pass a fundamental frequency component of the variable pulse width output. The power supply also includes a power output connected to the filter, wherein an amplitude at the power output is related to the pulse width at the variable pulse width output.07-14-2011
20090284181BACKLIGHT UNIT ASSEMBLY, DISPLAY DEVICE HAVING THE SAME, AND METHOD OF DIMMING THE DISPLAY DEVICE - A backlight unit assembly includes a surface light source with a plurality of first electrode lines extending in a first direction, a plurality of second electrode lines and a plurality of discharge blocks defined in regions where the first and second electrode lines cross each other, respectively; a memory stores discharge/non-discharge data; a luminance calculator calculates luminances of a selected region based on an image signal; and a dimming controller outputs dimming control signals corresponding to the calculated luminances by using the discharge/non-discharge data stored in the memory. A first driving signal is transmitted to one of the first electrode lines, a second driving signal having a different waveform from the first driving signal is transmitted to another of the first electrode lines adjacent the above first electrode line, and a driving voltage is applied to one of the second electrodes lines that crosses the above two first electrode lines.11-19-2009
20090289581HIGH INTENSITY DISCHARGE LAMP LIGHTING DEVICE AND LIGHTING FIXTURE - In order to optimally control power outputted from a high intensity discharge lamp lighting device for a difference among loads connected thereto, such as a difference in gas components contained in arc tubes and a difference in shape of the arc tubes individually in a plurality of discharge lamps 11-26-2009
20110169427CIRCUIT ARRANGEMENT AND METHOD FOR OPERATION OF A DISCHARGE LAMP - In various embodiments, a circuit arrangement may include a voltage-measuring device embodied to measure an output voltage, wherein the voltage-measuring device is embodied to provide at its output a signal which is correlated with the measured output voltage, wherein the voltage-measuring device is coupled to a control device for the purpose of transmitting said signal to the control device, and wherein the control device is embodied to vary an off-time as a function of the measured output voltage.07-14-2011
20110169425SINGLE CHIP BALLAST CONTROLLER FOR STEP-DIMMING OF A FLUORESCENT LAMP - The present invention relates a single chip ballast controller for step-dimming of a fluorescent lamp, comprising: a counting circuit, used to generate a switching count by counting the instances where the supply voltage falls below a threshold voltage; a reference voltage generator, used to generate a reference voltage proportional to the switching count; and a gating signal generator, used to generate a high side driving signal and a low side driving signal according to an error voltage between the reference voltage and a current sensing voltage to regulate the current sensing voltage at the reference voltage, wherein the current sensing voltage is proportional to a lamp current flowing through the fluorescent lamp.07-14-2011
20090009107LIGHT-EMITTING DEVICE, ELECTRONIC DEVICE, AND DRIVING METHOD OF LIGHT-EMITTING DEVICE - An object is to provide a novel driving method of a light-emitting element, particularly, an organic EL element. Another object is to provide a light-emitting device having a light-emitting element for which the driving method is employed and an electronic device having the light-emitting device as a display portion. A light-emitting device is provided, which includes: a pixel portion having a light-emitting element; a control switch connected to the pixel portion; and a sensor portion connected to the control switch. The control switch includes a unit configured to determine whether the light-emitting element emits light depending on an ambient temperature that is sensed by the sensor portion.01-08-2009
20110204822DEVICE AND METHOD OF PROVIDING POWER TO GAS DISCHARGE LAMP08-25-2011
20110204821OMNI VOLTAGE DIRECT CURRENT POWER SUPPLY - A battery operated LED lighting apparatus including: a battery outputting a battery voltage; a light emitting diode or array of light emitting diodes; and a power supply including a boost regulating circuit. The power supply being in communication with the battery and the light emitting diodes such that a constant voltage or constant current is supplied to the light emitting diodes as the battery discharges and the battery voltage falls below the output voltage. In a preferred embodiment the power supply further includes a buck regulator to maintain the proper output voltage when the battery voltage is greater than the output voltage.08-25-2011
20090261759DEVICE AND PROCESS FOR UNIFORMLY LIGHTING AN OPERATING AREA - A device and a process are provided for uniformly lighting an operating area for performing the lighting of an operating area (10-22-2009
20090261758LIGHT SOURCE DRIVING DEVICE - A light source driving device drives a plurality of light sources. A Power Factor Circuit (PFC) circuit converts a received electrical signal to a DC signal and output to a DC/AC converting circuit. The DC/AC converting circuit converts the DC signal to another AC signal, which is isolated by the transformer circuit. A resonance balancing circuit converts the AC signal output from the transformer circuit to another AC signal to drive the light source module. A PWM dimming controller outputs a control signal to control output of the DC/AC converting circuit according to a received dimming signal, wherein duty cycle of the control signal is fixed. A voltage dividing circuit adjustably divides voltage of the DC signal output from the PFC circuit. A PFC controller feeds the divided signal back to the PFC circuit to control the DC signal output from the PFC circuit.10-22-2009
20090261757Backlight driving circuit and driving method thereof - A backlight driving circuit includes a driving unit, a light source, a power supply circuit, and a controller connected to the driving unit. The power supply circuit includes a low voltage output terminal for outputting a low DC voltage and a high voltage output terminal for outputting a high DC voltage. If the backlight driving circuit is in a normal operation mode, the driving unit transforms the high DC voltage to a constant current for driving the light source by control of the controller. If the backlight driving circuit is in a power saving operation mode, the low DC voltage drives the light source by control of the controller.10-22-2009
20090039801Backlight control circuit - An exemplary backlight control circuit for changing a brightness of a light source includes a coarse adjusting circuit and a fine adjusting circuit. The coarse adjusting circuit is configured to coarsely adjust a DC voltage according to one received coarse adjusting signal. The fine adjusting circuit is configured to finely adjust the DC voltage according to one received fine adjusting signal. A change of the DC voltage generated by the coarse adjusting circuit is greater than another change of the DC voltage generated by the fine adjusting circuit.02-12-2009
20090039800AC POWER SUPPLY SYSTEM FOR BALANCED ENERGIZATION OF A PLURALITY OF LOADS - A gas-discharge lamp igniter is disclosed which has a group of gas-discharge lamps, such as those for LCD backlighting, connected in parallel with one another between the pair of outputs of an AC power supply. Provided one for each lamp to be energized, current-balancing transformers have their secondary windings serially interconnected. The lamps are connected to one of the pair of outputs of the AC power supply via the respective primary windings of the current-balancing transformers and the serial connection of the secondary windings thereof.02-12-2009
20090167210Current shaping of an LED signal for interfacing with traffic control equipment - A system creates a desired current level within a traffic signal. A power supply unit receives an external power signal and transforms the power signal to a lamp current. A pulse generator monitors the value of the lamp current and automatically adjust the power usage of the current sink circuit to maintained a predefined current amplitude. A current pulser generates square current pulses at a frequency based at least in part on the frequency of the lamp current. A current sink superimposes the rectangular current pulse onto the lamp current and outputs a combined power signal to the alternating current power line.07-02-2009
20100277102ELECTRONIC BALLAST WITH DIMMING CONTROL FROM POWER LINE SENSING - The present invention discloses an electronic ballast with dimming control from power line sensing for a fluorescent lamp, comprising: a line switching sensing circuit, used to generate a switching sensing signal by performing a voltage comparison operation on a DC voltage, and generate a reset signal according to the off time of the power line; a dimming voltage generator, used to generate a dimming voltage according to a count of the switching sensing signal; and a phase-controlled non-overlapping driver, used to generate a high side driving signal and a low side driving signal for delivering a lamp current according to the dimming voltage, wherein the dimming voltage is used to generate a phase, and the phase is used to generate the lamp current.11-04-2010
20100102757HID Lamp Ballast with Controlled DC Step Down Circuit - An electronic ballast is provided for powering a high intensity discharge lamp. A voltage step-down circuit is arranged to reduce an input DC voltage. An inverter circuit includes at least one high frequency switching element is and arranged to convert the reduced voltage to a high frequency AC voltage. A resonant circuit receives the high frequency voltage and is further coupled to the discharge lamp. A voltage step-down control circuit controls the DC voltage output from the voltage step-down circuit. A driving circuit supplies a driving signal to the switching element of the inverter, and further adjusts a driving frequency of the driving signal, thereby controlling the high-frequency voltage. The high frequency voltage in a first operating mode is controlled to a low level wherein the lamp is prevented from starting. The high frequency voltage in a second operating mode is controlled to a high level wherein the discharge lamp can be started.04-29-2010
20100102758Illumination apparatus - An illumination apparatus includes a light source unit having solid light-emitting elements and a sensor unit having a wave transmission portion for transmitting energy waves of specified frequency and a wave reception portion for receiving the energy waves reflected from an object. The sensor unit outputs a detection signal by detecting the object within a detection range based on the difference in frequency between the transmitted and received energy waves. The illumination apparatus further includes a control unit responsive to the detection signal from the sensor unit for performing a control operation to turn on the light source unit, and a power source unit for supplying electric power to the light source unit. The power source unit is arranged outside the detection range of the sensor unit. The sensor unit is provided on the opposite side to the direction of light irradiated from the light source unit.04-29-2010
20110266976System and Method of Tuning Current for LEDs - An apparatus includes a LED and a regulator circuit. The regulator circuit controls the current provided to the LED according to a calibration signal that is coupled to the current. The regulator circuit adjusts the output of the LED when the calibration signal is adjusted. In this manner, the LED may be calibrated to generate light at a desired brightness level and color level.11-03-2011
20080238343System and Method for Dimming One or More Light Source - A system for dimming one or more light sources includes a first light source that emits a light of a first brightness according to an operating condition of the first light source, a second light source that emits a light of a second brightness according to an operating current of the second light source, wherein the light of the first brightness is different than that of the light of the second brightness, and one or more components that references the operating condition of the first light source, wherein, in response to the referenced operating condition of the first light source, the one or more components modifies the operating current of the second light source to substantially match the light of the second brightness to the light of the first brightness. A method for dimming one or more light sources is also disclosed.10-02-2008
20090058324PRECHARGE CONTROLLING METHOD AND DISPLAY DEVICE USING THE SAME - An embodiment of the invention provides a precharge controlling method, including the steps of: providing a voltage generating circuit with an output circuit for outputting a voltage having a necessary level, and a comparator; judging an output voltage from the output circuit in the comparator during a precharge time period, and feeding back an output signal from the comparator to the output circuit; and controlling a precharge voltage until the voltage having the necessary level outputted from the output circuit is reached.03-05-2009
20090167209Circuit arrangement and method for operating at least one electric lamp - A circuit arrangement for operating at least one electric lamp having an inverter has at least one first and one second bridge transistor arranged in series with one another, a first drive circuit for the first bridge transistor; a second drive circuit for the second bridge transistor; the and second drive circuits being designed to drive the first and second bridge transistors to switch alternately completely on and off during normal lamp operation; and at least one protective apparatus; the at least one protective apparatus being designed, in the case of a value for a reference voltage, which is correlated with the voltage across the bridge transistor which has just been switched off, above a predeterminable limit value, to drive the bridge transistor, which has just been completely switched on, such that it is no longer completely switched on. A related method is also described.07-02-2009
20080278099Controlling electroluminescent panels in response to cumulative utilization - An electronic device includes a light source, which generates light in response to a signal, and a controller. Because the luminosity of the light source decays over time, the controller generates a utilization value based on a cumulative time that the light source is emitting light, and regulates the signal that is provided to the light source in response to the utilization value to at least partially compensate for decay in the luminosity of the light source.11-13-2008
20080284356Remote Dimmable Energy-Saving Device for Fluorescent Lamps - A remote dimmable energy-saving device (fluorescent lamp) (11-20-2008
20080284355Method and Driving Circuit for Operating a Hid Lamp - To avoid acoustic resonance in a gas discharge lamp, a lamp current constituted of a number of frequencies is supplied to said lamp. Using a number of frequencies, the total power supplied to the lamp is distributed over said number of frequencies. Since the power per frequency is relatively low, the possibility of occurrence of an acoustic resonance is low irrespective of the characteristics of the gas discharge lamp. The current may comprise a number of frequencies by applying a number of sinusoidal currents or by using a non-sinusoidal current.11-20-2008
20100033112Driving power supply system of an active type LED with multiple channels - The present invention is to provide an active type multiple channeled LED power driving system, which is an operation system of driving power mainly designed for light source equipment using high power LED. The best system composition includes seven operation regions. The ordinary power is lead-in through a first region, and at first the regulating and filtering are proceeded by an EMC circuitry. Then, after it is lead-in a PWM circuitry to raise its power, the voltage transformation is processed through the second region. After it is further regulated and filtered to form the optimum power through the CC&CV control circuitry in the third region, it proceeds multiple channeled splitting by the fourth region. And, the original DC (direct current) power output is modulated into the intermittent electric power capable of controlling the output frequency and width of period by intermittent modulating circuitry in the fifth region. It further is output to the LED lighting modules of the sixth region to proceed the light source activation operation. At the same time, there is an environment parameters' sensor set in the seventh region to feedback the temperature coefficients of the LED lighting module to the CC&CV control circuitry in the third region to proceed the adjustment and judgment in its curve of output voltage and current. Through this, it can achieve the active electronic typed heat dissipation and raise the energy efficiency thus let the LED lamp and lantern be able to achieve its maximum performance.02-11-2010
20080303455Method for Driving of a Fluorescent Lighting and a Ballast Stabilizer Circuit for Performing the Same - A method of driving a fluorescent light, having: (a) receiving and full-wave rectifying commercial AC power; (b) dividing phases of the AC power full-wave rectified at step (a) depending on voltage magnitude, and performing switching control such that low-voltage portions of the divided voltages, having low phases, are used as heating power for heating filaments of a fluorescent tube, and high-voltage portions of the divided voltages, having high phases, are used as discharge voltage of the fluorescent tube; (c) switching on the low-voltage portions having low phases as the heating power for heating the filaments of the fluorescent tube in response to a signal output at step (b); and (d) switching on the high-voltage portions having high phases as the lighting power of the fluorescent tube in response to the signal output at step (b).12-11-2008
20100295479Illumination apparatus - An illumination apparatus includes a lamp load; a lighting circuit unit for turning on the lamp load; a sensor unit; an amplifier circuit unit for; a control unit for controlling the lighting circuit unit to turn on or off the lamp load depending on presence or absence of a human body; and a power supply unit. The control unit determines that a human body is present when a voltage of the. amplified detection signal exceeds a first threshold voltage while the lighting circuit unit is not operated and the lamp load is turned off, and determines that a human body is present if a voltage of the amplified detection signal exceeds a second threshold voltage while the lighting circuit unit is operated and the lamp load is turned on, a magnitude of the second threshold voltage being set to be higher than a magnitude of the first threshold voltage.11-25-2010
20080203946LIGHT EMITTING APPARATUS - In conduction of light emitting diodes LEDs 08-28-2008
20100264848METHOD OF SHUTTING DOWN A HIGH PRESSURE DISCHARGE LAMP AND DRIVING UNIT FOR DRIVING A HIGH PRESSURE DISCHARGE LAMP - The invention describes a method of shutting down a high pressure discharge lamp (10-21-2010
20110006705VOLTAGE MULTIPLE DIMMING CONTROL APPARATUS - The present invention discloses a control apparatus, which not only accepts multiple dimming control signals, but also combines the signals in analog manner. By means of this, an inevitable analog to digital converter in a conventional voltage multiple dimming control apparatus can be saved without hurting the performance of generation of pulse width modulation signals. Compared with the conventional arts, the present invention further exhibits reduction in view of chip size and power consumption.01-13-2011
20100201287Method and Apparatus for Achieving Inherent Ignition Voltage in Operation of a High Intensity Discharge Lamp - A high intensity discharge lamp, such as a high power sodium or metal halide lamp, having an electronic ballast. The electronic ballast may incorporate resonance-based circuitry for achieving an ignition state via a frequency sweeping step, the particular ignition voltage being inherent to the operational state of the high intensity discharge lamp. The operating state of the lamp may be sensed in order to apply power and voltage levels appropriate for steady state operation.08-12-2010
20100141178DIMMER CONTROL LEAKAGE PULL DOWN USING MAIN POWER DEVICE IN FLYBACK CONVERTER - A flyback controller-may include a dimmer input configured to receive a chopped and rectified AC voltage. Each cycle of the signal may have an off period which is substantially attenuated but not always zero due to leakage of a dimmer control from which the chopped AC voltage originates, and an on period which substantially tracks the AC voltage. The ratio of the off period to the on period may be dependent upon a setting of the dimmer control. The flyback controller may include a control circuit configured to generate a switching signal based on the signal from the dimmer input. The switching signal may controllably oscillate between its on and off states during the on periods of the chopped and rectified AC voltage so as to controllably regulate current that is delivered by a secondary winding of a transformer in a flyback converter. The switching signal may be in the on state during the off periods of the chopped and rectified AC voltage, thereby preventing a voltage build up from the dimmer control leakage.06-10-2010
20100270950DC/DC CONVERTER - A control circuit of a DC/DC converter is provided for supplying a driving voltage to a light emitting element. A hysteresis comparator compares a detection voltage that corresponds to the output voltage of the DC/DC converter with two threshold voltages. If the detection voltage is smaller than the lower threshold voltage, the hysteresis comparator outputs a comparison signal at the low level. Otherwise, the comparison signal is set to the high level. The switching control unit uses the comparison signal as a reference. The switching control unit instructs the switching transistor of the DC/DC converter to perform the switching operation during a period when the comparison signal is at the low level. Otherwise, the switching operation is suspended. The control circuit inhibits light emission of the light emitting element during a period when the comparison signal is at the low level. Otherwise, the control circuit permits the light emission.10-28-2010
20100270949ELECTRONIC BALLAST WITH INPUT VOLTAGE FAULT CONTROL - An electronic ballast includes circuitry to prevent a switch from being damaged in the case where an abnormality occurs in an output voltage of an input power supply. A DC power supply control circuit has a zero current detection circuit that, when a current through an inductor becomes equal to or less than a predetermined current value, outputs a zero signal. A peak current detection circuit, when current through a switch the DC power supply circuit becomes equal to or greater than the predetermined current value, outputs a peak signal. A first drive circuit turns on the switch according to the zero signal, and turns off the switch Q10-28-2010
20100141179Universal input voltage light emitting device - The configurations of a light emitting device are provided in the present invention. The proposed device includes a light source, an enclosure, and an integrated control circuitry coupled to the light source, enclosed in the enclosure and receiving a universal input voltage.06-10-2010
20120104975LIGHTING SYSTEM ELECTRONIC BALLAST OR DRIVER WITH SHUNT CIRCUIT FOR LIGHTING CONTROL QUIESCENT CURRENT - Ballasts and LED drivers are presented for powering at least one light source, in which a shunt circuit provides a high impedance to allow operation of the light source when the AC input power exceeds a power threshold value, and provides a low impedance when the AC input power is below the power threshold value to prevent an output power stage from providing power to the light source.05-03-2012
20090160369CONTROLLING A LIGHT EMITTING DIODE FIXTURE - One embodiment in accordance with the invention can include a circuit for controlling a light emitting diode (LED) lighting fixture via a power line. The circuit can include a power switch coupled to the power line and is for outputting a firing angle. Additionally, the circuit can include a control circuit coupled to the power switch and is for implementing firing angle control of the power switch. Furthermore, the circuit can include a translator coupled to receive the firing angle and for mapping the firing angle to a function of the LED lighting fixture.06-25-2009
20090160366Method for Setting an Electronic Ballast - Method for setting an electronic ballast, with which an electric lamp is operated which comprises programming first settings of at least one operational parameter of at least one first lamp type into the electronic ballast, setting and operating an electric lamp, which is connected to the electronic ballast, with the programmed first settings as long as a normal operating mode of the electronic ballast is set, changing the first settings of the operational parameters during a secondary operating mode of the electronic ballast, the secondary operating mode of the electronic ballast being set when the electronic ballast identifies a value for the resistance of a lamp filament and/or a substitute load of the electric lamp connected to the electronic ballast which is untypical in comparison with the normal operating mode, the change to the first settings being carried out depending on the identified untypical value for the corresponding resistance.06-25-2009
20090128057FLUORESCENT LAMP AND BALLAST WITH BALANCED ENERGY RECOVERY PUMP - A fluorescent lamp formed of a power control unit and a fluorescent lamp assembly. The lamp assembly includes a fluorescent tube having filaments and including inductive and capacitive components connect to the filaments forming a resonant network. The power control unit includes an input power unit, an energy recovery pump, a bulk capacitor and a lamp driver including a half-bridge power stage and a half-bridge driver. The input power unit provides an input voltage, includes a lamp driver for switching a high DC voltage with a high switching frequency to provide a high-frequency driving voltage for driving the resonant network. The energy recovery pump is balanced so as not to disturb the resonance of the network and so as to enable recovery and transfer of energy to the bulk capacitor and thereby establish a high luminous efficiency for the fluorescent lamp.05-21-2009
20100194311DRIVING DEVICE FOR DISCHARGE LAMP, LIGHT SOURCE DEVICE, PROJECTOR, AND DRIVING METHOD FOR DISCHARGE LAMP - A driving device adapted to drive a discharge lamp including first and second electrodes adapted to generate discharge light, a primary reflecting mirror disposed on a side of the second electrode and adapted to reflect the discharge light, a secondary reflecting mirror disposed on a side of the first electrode and adapted to reflect the discharge light. The driving device includes: a deterioration detection section adapted to detect a degree of progression of deterioration in the first and the second electrodes; and a deterioration handling section adapted to increase first anode power energy, which is supplied while the first electrode acts as an anode, in accordance with the degree of progression of the deterioration detected by the deterioration detection section.08-05-2010
20090284180DRIVING CIRCUIT FOR LIGHT EMITTING DEVICE WITH COMPENSATION MECHANISM AND DRIVING METHOD THEREOF - A light emitting device driving circuit, includes: a switch device, a comparator, a driving module, a time counting circuit and a compensation module. The switch device is turned on or off according to a control signal for controlling a driving current flowing through the light emitting device. The comparator generates a comparison result according to a reference voltage and a feedback voltage corresponding to the driving current. The driving module generates the control signal according to the comparison result. The time counting circuit controls the driving module to turn on the switch device after the switch device turns off for a predetermined time. The compensation module detects a turn on time for the switch device and a delay time between the feedback voltage reaching the reference voltage value and the control signal varying correspondingly, and adjusts the reference voltage according to the turn on time and the delay time.11-19-2009
20090184670WAVEFORM MANAGEMENT SYSTEMS AND METHODS FOR BALLASTS - Waveform management systems and methods for ballasts are provided. The system includes a lamp, a ballast, a first interface, a storage unit, and a processing unit. The processing unit obtains at least one first waveform from the storage unit, and writes the first waveform to the ballast via the first interface. The processing unit transmits an illumination signal to the ballast via the first interface, such that the ballast controls the illumination of the lamp according to the first waveform.07-23-2009
20120068626Auto-Sensing Switching Regulator to Drive A Light Source Through A Current Regulator - An auto-sensing switching regulator, and systems and methods including same, is disclosed. The auto-sensing switching regulator includes a switching regulator and a controller coupled thereto. The controller is configured to provide a control signal to the switching regulator to increase the output voltage while receiving a current sense signal representative of a current output of the switching regulator, and to provide the control signal in response to the current sense signal to set the output voltage at a set value corresponding to a value at which the current output stops increasing with an increase in the output voltage. A system to drive a light source includes a current regulator configured to provide a constant current output to the light source and an auto-sensing switching regulator coupled to the current regulator, and configured to receive an input voltage from a voltage supply and provide an output voltage to the current regulator.03-22-2012
20120068625LIGHTING DEVICE WITH MULTIPLE ELECTRICAL CONNECTIONS - Various lighting devices and related methods are provided. In one example, a portable lighting device includes a light source, lighting control circuitry, first and second power terminals adapted to receive a battery power source, first and second electrical connections between the lighting control circuitry and the first and second power terminals, a third electrical connection between the second power terminal and the lighting control circuitry, and a switch adapted to selectively connect and disconnect the third electrical connection. The lighting control circuitry is adapted to operate the light source in response to a signal received over the third electrical connection in response to the switch. The first and second electrical connections are adapted to provide constant power to the lighting control circuitry while the battery power source is connected to the first and second power terminals regardless of operation of the switch.03-22-2012
20090256498FILAMENT POWER SUPPLY CIRCUIT FOR VACUUM FLUORESCENT DISPLAY - In a filament power supply circuit of a vacuum fluorescent display, an integration circuit is connected to a signal input terminal which receives a pulse signal having a magnitude corresponding to a DC power supply voltage. A comparison circuit compares an output voltage from the integration circuit with a reference voltage, and outputs a result. A first filament cathode connection terminal is connected to one terminal of the filament cathode of a vacuum fluorescent display and applies the DC power supply voltage to the one terminal. A second filament cathode connection terminal is connected to the other terminal of the filament cathode to ground the other terminal via a capacitive element. A three-terminal element includes first, second, and third terminals. The first terminal is connected to the first filament cathode connection terminal. The second terminal is grounded. The third terminal receives the output from the comparison circuit so that the path between the first terminal and the second terminal is switched in accordance with it.10-15-2009
20090015180Discharge lamp lighting apparatus - A discharge lamp lighting apparatus includes an input power supply, a power supply circuit, a bridge circuit having switching elements Q01-15-2009
20090015179BACKLIGHT CONTROL DEVICE AND DISPLAY APPARATUS - A PWM generation circuit is set so as to generate a PWM pulse signal having a frequency that is an odd number times a vertical synchronization frequency. A frequency division circuit frequency-divides the PWM pulse signal generated by the PWM generation circuit. An AND gate calculates the logical product of the PWM pulse signal generated by the PWM generation circuit and a frequency-division pulse signal outputted from the frequency division circuit. An OR gate calculates the logical sum of the PWM pulse signal generated by the PWM generation circuit and the frequency-division pulse signal outputted from the frequency division circuit. A selector outputs an output signal of the OR gate as a dimming pulse signal in a case where the set duty ratio is not less than 50%, while outputting an output signal of the AND gate as a dimming pulse signal in a case where the set duty ratio is less than 50%. Consequently, the frequency of the dimming pulse signal is five-second the frequency of a vertical synchronizing signal.01-15-2009
20110221360FEEDBACK LOOP FOR EMITTER FLASHING - A method and a device for stabilizing the emission current of an emitter of a charged particle beam device are provided. In the method, the emitter is operated under predetermined operation parameters including at least one voltage with a predetermined value. The method includes determining a first value of the emission current under the predetermined operation parameters and flash cleaning the emitter while a first electric field is applied to the emitter. The first electric field is generated by the at least one voltage having a first value of the at least one voltage, wherein the first value of the at least one voltage is provided in dependence of the determined first value of the emission current.09-15-2011
20090051300METHOD AND DRIVING UNIT FOR DRIVING A GAS DISCHARGE LAMP - This invention describes a method for driving a gas discharge lamp (02-26-2009
20090096390Electronic Ballast and Method for Operating an Electrical Lamp - An electronic ballast for an electrical lamp (04-16-2009
20090096391Control of Delivery of Current Through One or More Discharge Lamps - Control of delivery of current through one or more discharge lamps. Methods include alternately switching on and off switching elements that control a fluorescent lamp, in response to receiving input, until the brightness of the lamp decreases to a threshold. Further, methods include providing control signals at complementary duty cycles to further decrease the brightness and alternating the duty cycles of the signals applied to the filaments of the fluorescent lamp. Methods also include identify parameter sets stored in memory to operate fluorescent lamps.04-16-2009
20130214701SYSTEMS AND METHODS FOR LUMINESCENT DISPLAY - A ruggedized luminescent display system for displaying electronic images or light from a surface of an object, such as a boardsport medium, helmet medium, or protective clothing medium, for visibility enhancement. According to various aspects of the present invention, the object may comprise a resilient transmissive material disposed within a cavity of the object and may have a surface that is configured to be substantially flush with an outer surface of the object. A light source may be disposed within the object and may emit light through the resilient transmissive material such that the light may be visible from the outer surface of the object. The light source may be electrically coupled to an integrated circuit board with a control system comprising a microcontroller that may control the emission of light from the light source in response to a signal. The microcontroller may receive the signal from a motion sensor that may be electrically coupled to the integrated circuit board and configured to detect the motion of the object. The luminescent display system may be configured to indicate at least one or more of location, distance, direction and/or speed. The luminescent display system may be configured to illuminate environmental surroundings.08-22-2013
20090230888DISCHARGE LAMP OPERATION DEVICE - To improve the startability of a discharge lamp by achieving a smooth transition from a glow discharge to an arc discharge. A discharge lamp lighting device comprises: a direct-current power supply 09-17-2009
20090230889VOLTAGE SENSING APPARATUS FOR POWER REGULATION AND OVER-VOLTAGE PROTECTION OF DISCHARGE LAMP AND METHOD THEREOF - The configurations of a discharge lamp system and a controlling method thereof are provided in the present invention. The proposed discharge lamp system includes a discharge lamp, a converter circuit coupled to the discharge lamp and having a switching switch, a ballast controller generating a first driving signal and controlling the switching switch accordingly, and a voltage sensing apparatus receiving the first driving signal and generating a sensed voltage accordingly, wherein the discharge lamp is switched among a plurality of operating modes according to the sensed voltage.09-17-2009
20090230887ELECTRONIC BALLAST FOR A GAS DISCHARGE LAMP WITH CONTROLLED FILAMENT HEATING DURING DIMMING - An electronic ballast has control circuitry to operate a gas discharge lamp in both full and dimmed illumination modes. A dimming controller serves as the mechanism to permit a selection between full and dimmed illumination modes. The dimming controller signal has a dimming request range which describes the range of dimming controller signal magnitudes. The electronic ballast also includes a full power circuit having a power control coupled to the dimming controller output to receive the dimming controller signal. The full power circuit also has a full power output that can couple to the lamp. When the full power circuit receives the dimming controller signal, via the power control, and the dimming controller signal is not in the dimming request range (i.e. the full illumination mode has been selected), the full power circuit generates a full power signal capable of driving/operating the lamp(s) in the full illumination mode. A filament heating circuit has a heating input coupled to the reduced power circuit, to receive the reduced power signal, and a heating output that can couple to the filaments of one or more lamps. When the reduced power signal is present, the filament heating circuit generates and provides a filament heating signal to the filaments, via the heating output. The filament heating signal maintains the temperature of the filaments when the lamp(s) are operated in the dimmed illumination mode. Further, the filament heating signal is responsive to the reduced power signal.09-17-2009
20090200965ENERGY SAVINGS CIRCUITRY FOR A LIGHTING BALLAST - Methods and apparatus for saving energy in a ballast comprising a tank circuit for a gas-discharge lamp are disclosed. A feedback circuit and a filament shutoff circuit cooperate to detect energy in the tank ballast and save energy during operation. The feedback circuit detects current flowing in the tank circuit of a ballast and can signal to shut off a voltage regulator in the ballast, and/or signal to a filament shut off circuit to reduce energy consumed by the filaments in the bulb after ionization has occurred. A time delay ensures that the signal voltage generated does not immediately deactivate the voltage regulator and/or the filament shutoff circuit when powering the ballast, but only does so after ionization has occurred. In this manner, energy consumption is reduced after ionization of the bulbs has occurred.08-13-2009
20090200964Methods And Apparatus For Dimmable Ballasts With A High Power Factor - Methods and apparatus for powering dimmable ballast circuits are disclosed. In the described examples, a dimmable ballast circuit includes a rectifier, an energy storage device, a driver circuit, and a resonant circuit that are configured to actuate the light source such as a fluorescent lamp. Specifically, energy storage device is a capacitor that stores a high frequency energy and continually recycles energy in the circuit, resulting in a circuit with a large power factor. Further, because the current flowing into the resonant circuit is substantially sinusoidal, the circuit generally has an ideal crest factor, thereby increasing the lifespan of the light source.08-13-2009
20090206774Electronic reactive current oscillation-reducing ballast - The invention relates to an electronic ballast presenting an input capacitor and comprising and step-up chopper for operating a load, for example a discharge lamp, on a phase control dimmer having an integrated or parasite inductance. In such a way, the voltage overshooting on the input capacitor are reduced by active charge or discharge thereof.08-20-2009
20090243515MOTION ADAPTIVE AMBIENT LIGHTING - A method for controlling an ambient lighting element including receiving a content signal, analyzing the content signal to determine a motion vector of an object (10-01-2009
20090230890ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE AND METHOD OF PRODUCING THE SAME - An organic electroluminescent display device in which a plurality of light-emitting cells each having an organic electroluminescent portion are arranged on a substrate, wherein a plurality of organic electroluminescent portions included in the plurality of light-emitting cells include at least three organic electroluminescent portions which emit different colors, each of the light-emitting cells has a driving transistor which drives the organic electroluminescent portion included in the light-emitting cell, and an amount of an output current of the driving transistor under same driving conditions is different depending on emission color of the organic electroluminescent portion included in the light-emitting cell including the driving transistor.09-17-2009
20110227506CONTROLLERS, SYSTEMS AND METHODS FOR CONTROLLING POWER OF LIGHT SOURCES - A controller for controlling power to an LED light source includes a control terminal and control circuitry coupled to the control terminal. The control terminal provides a control signal to control a transformer. A cycle of the control signal includes a charging period, a discharging period, and an adjusting period. The control circuitry controls a primary winding of the transformer to receive power during the charging period and controls a secondary winding of the transformer to discharge power to the LED light source during the discharging period. The control circuitry further varies a frequency of the control signal periodically by controlling the adjusting period.09-22-2011
20090243516LIGHT EMITTING APPARATUS - A light emitting apparatus includes a clock generating circuit and a light-emitting module. The clock generating circuit is for generating a clock control signal. The light emitting module includes a current supplying unit and a light emitting unit. The current supplying unit is for controlling a driving current flowing through a path, and includes a driving current source and a switch unit, which are both positioned in the path. The driving current source is for providing the driving current. The switch unit is coupled to the driving current source and the clock generating circuit, and refers to the clock control signal to open or short for controlling whether the driving current flows through the path. The light emitting unit is positioned in the path and coupled to the current supplying unit, and is for providing a light source according to the driving current.10-01-2009
20090315482Light emitting apparatus capable of controlling lighting color and method thereof - A light emitting apparatus and a method for controlling the same are provided. The light emitting apparatus comprises a color-temperature relation stored in a memory, a thermometer or temperature acquiring means for acquiring a temperature reading, a processor for comparing the temperature reading with the color-temperature relation and determining a lighting color, and a light emitting unit for emitting the lighting color determined by the processor.12-24-2009
20090256499POWER SUPPLY, DISPLAY DEVICE, AND LIGHT SOURCE DRIVING APPARATUS - A power supply is provided, which includes a DC-DC converter being supplied with an external DC input voltage and a first switching control signal and outputting a duty sensing signal of which a magnitude is varied in accordance with the first switching control signal, the duty sensing signal being indicative of a duty ratio of the first switching control signal, and the DC-DC converter converting the input voltage into a DC output voltage of a predetermined magnitude based on the first switching control signal; and a feedback controlling unit comparing the duty sensing signal with a first reference signal to adjust the duty ratio of the first switching control signal.10-15-2009
20090273304APPARATUS AND METHOD FOR TRIMMING AN OUTPUT PARAMETER OF AN ELECTRONIC BALLAST - An electronic ballast includes a microprocessor which is programmed to read an external voltage value, output a signal which controls an amount of power outputted by the electronic ballast, and adjust the signal based upon a difference between the external voltage value and an internal reference value.11-05-2009
20120194098BRIGHTNESS CONTROL FOR LIGHTING FIXTURES - A brightness controller determines a dimmer setting and adjusts brightness of a light source according to the dimmer setting.08-02-2012
20090128058Overload Protection Circuit - A current shut-off overload protection circuit useful for fluorescent lamp ballast protection and the like has at least one power transistor for supplying a load current to a circuit load, a protection circuit comprising a current sensing resistance connected for developing a voltage drop related to the circuit load, and a switching diode having a control input operative for turning off the power transistor by removing a bias level, as by grounding the transistor base, responsive to a preset level of the voltage drop such that the load current to the load is switched off upon the load current exceeding a maximum acceptable load current represented by a preset level of the voltage drop.05-21-2009
20110140637LED ILLUMINATION SYSTEM WITH A POWER SAVING FEATURE - An LED illumination system includes a control circuit having a timing unit, a control unit, a PWM signal generating unit and a micro-programmed control unit (MCU). The timing unit divides an operating period of an LED lamp into different time segments, and outputs clock signals. The control unit outputs different controlling signals corresponding to the clock signals to the PWM signal generating unit, which in turn generates different PWM signals with different duty cycles. A constant current circuit electrically connects the control circuit and outputs different electric currents to make the LED lamp emit light having different light intensities at the different time segments. The MCU is at an outside of the LED lamp and sets a program to control the timing unit, the control unit and the PWM signal generating unit.06-16-2011
20100148700Constant Current Output Sink or Source - A constant current output sink or source eliminates a current limiting series resistor for a light emitting diode (LED) and maintains a constant light intensity from the LED for all operating and manufacturing variables of a digital device since the current through the LED is maintained at a constant value. The constant current output sink or source may be programmable for selection of a constant current value from a plurality of constant current values available.06-17-2010
20100156324LED DRIVER CIRCUIT WITH OVER-CURRENT PROTECTION DURING A SHORT CIRCUIT CONDITION - An LED driver circuit is provided for protecting one (or more) LEDs connected in series from over-current damages which may result from a short circuit condition. The driver circuit includes a current control circuit for receiving an input signal from a power source and providing a current output for powering the LED. A voltage sensor detects a voltage across the LED. An LED current restriction circuit such as a switching element restricts a current flow into the LED. A short circuit response circuit controls the LED current restriction circuit dependent on a comparison between the voltage detected by the voltage sensor and a predetermined threshold value. When the detected voltage is less than or equal to the threshold value, the response circuit determines a short circuit, and a signal is sent to the current restriction circuit to restrict current flow into the one or more LEDs.06-24-2010
20100156323Light emitting device driver circuit and method for driving light emitting device - The present invention discloses a light emitting device driver circuit and a method for driving a light emitting device. The circuit comprises: a power stage performing power conversion on an input voltage to supply an output current to one or more light emitting devices; and a control circuit sensing the output current of the power stage to feedback control the power stage accordingly.06-24-2010
20100176748TRANSMITTER AND INFORMATION PROCESSING DEVICE CONVERTING SUPPLY VOLTAGE TO DRIVE VOLTAGE - A transmitter includes a voltage conversion circuit converting supply voltage externally supplied into drive voltage and outputting the drive voltage; and an optical output unit which is supplied with the drive voltage and outputs an optical signal, wherein the voltage conversion circuit and the optical output unit are included in a same module.07-15-2010
20120194100LIGHTING DEVICE AND LUMINAIRE - According to one embodiment, a lighting device includes a lighting circuit, a lighting time measuring circuit, an initial illuminance correction control circuit and a dimming control circuit. The lighting circuit lights an illumination lamp. The lighting time measuring circuit counts a lighting time of the illumination lamp. The initial illuminance correction control circuit performs initial illuminance correction control of the lighting circuit according to the lighting time counted by the lighting time measuring circuit, and controls light output of the illumination lamp to be constant during life of the illumination lamp. The dimming control circuit performs dimming lighting control of the lighting circuit according to a dimming signal.08-02-2012
20090315484WIDE VOLTAGE, HIGH EFFICIENCY LED DRIVER CIRCUIT - An electrical circuit and method for driving light emitting diodes with a constant current via a high efficiency DC-DC converter controlled by a digital controller through pulse width modulation (PWM).12-24-2009
20090315483LIGHT EMITTING DIODE ILLUMINATING APPARATUS - A light emitting diode (LED) illuminating apparatus (12-24-2009
20100176747OUTPUT BUFFER AND SOURCE DRIVER USING THE SAME - An output buffer and a source driver using the same are provided. The output buffer includes an input stage module, a first output stage module, a second output stage module, and a first control module. The input stage module generates a first bias signal via a first connection terminal according to a driving signal and a output signal. The first output stage module generates the output signal in response to the first bias signal via an output terminal of the output buffer. The second output stage module generates a second bias signal in response to the first bias signal via a second connection terminal, and controls a first switch in the second output stage module. The first control module selectively connects a first current source to the output terminal of the output buffer or to the second connection terminal of the second output stage module according to an indication signal.07-15-2010
20100156322LOW POWER NON-ISOLATED DRIVER - The present invention mainly discloses low power non-isolated driver that can be used for LED lighting and other non-isolated power supply appliance, in which the input side is connected to an AC or DC input, a PWM control circuit is connected to the buck converter switch, a capacitor filters the output voltage ripple and an output voltage/current control circuit provides feedback signal to the PWM control circuit. The present invention has such features of less component number, low total cost, high reliability, and better line/load regulation.06-24-2010
20090121655Terminal device and computer-readable storage medium - A terminal apparatus and a computer-readable storage medium capable of achieving reduction of power consumption by appropriately controlling lighting of a display unit are provided.05-14-2009
20090121654LED Light Output Linearization - A system and method for producing a flattened characteristic for LED luminous output. The system may include an array containing one or more light emitted diodes, a power source connected to the LED array providing drive current to the LED array, a timer connected to a controller wherein the timer logs the on-time of the LED array and communicates the LED array on-time to the controller, and a controller connected to the power source wherein the controller adjusts the intensity of the drive current provided to the LED array based on the on-time data received from the timer such that the resultant relative luminous output is approximately equal to the initial relative luminous output.05-14-2009
20090289580BACKLIGHT ADJUSTMENT SYSTEM - A preferred embodiment relates to controlling the amount of backlight in an electronic display to account for the temperature in the backlight cavity. Another embodiment relates to a system for controlling the amount of backlight based on both the temperature in the backlight cavity and the amount of ambient light. The embodiments are especially useful in electronic displays which are subjected to cold or warm temperatures and displays which are placed in very bright environments. Exemplary embodiments allow the display to remain visible, while avoiding possible damage due to high levels of heat or cold.11-26-2009
20100188020HIGH FREQUENCY BALLAST FOR A FIXED OUTPUT HIGH INTENSITY DISCHARGE LAMP - A high frequency ballast for a fixed output high intensity discharge lamp is serially connected in order with a power input circuit, an electromagnetic wave interference filtering loop, a rectifying loop, a high power factor correction loop, a voltage-controlled oscillator ballast driver and a load loop, wherein the voltage-controlled oscillator ballast driver is connected with an ignition sequence control logic loop by a built-in voltage oscillator, and a half-bridge driving loop receives power transmitted by the high power factor correction loop and then converts into a steady power output by the ignition sequence control logic loop. When a lamp cannot start successfully, it can start by itself repeatedly through a restart triggering loop; and after the lamp has started, an operational amplifier circuit is used to maintain an original frequency which sets the power, so as to adjust automatically according to the lamps of various frequencies.07-29-2010
20090079367Software Controlled Electronic Dimming Ballast - A software controlled electronic dimming ballast for preheating, striking, and varying the dimming level of a lamp. In one embodiment, the ballast includes an EMI filter circuit, an AC/DC converter circuit, a PFC circuit, an inverter circuit, and a software controlled microcontroller circuit. The microcontroller circuit includes a microcontroller and software for generating inverter control signals that cause the inverter circuit to preheat, strike, and varying the dimming level of the lamp. The inverter control signals are generated based on dimming control and lamp dimming level feedback signals. The ballast also includes a lamp dimming level feedback signal conditioning circuit for generating the lamp dimming level feedback signals. Alternative embodiments of the ballast are also described.03-26-2009
20090079366FAST RUN-UP OF METAL HALIDE LAMP BY POWER MODULATION AT ACOUSTIC RESONANCE FREQUENCY - A method of controlling run-up of a metal halide lamp that has a nominal (full) light output during steady state operation and that has a current limit I03-26-2009
20090079365CONTROL METHOD AND BALLAST FOR RUN-UP OF METAL HALIDE LAMP - A method of controlling run-up of a metal halide lamp that has a nominal (full) light output during steady state operation and that has a current limit I03-26-2009
20090039802Backlight control circuit - An exemplary backlight control circuit includes a pulse width modulation integrated circuit (PWM IC) having a power input terminal, a power source capable of outputting an operation voltage, and a switching circuit connected between the power source and the PWM IC to control if the operation voltage is provided to the power input terminal.02-12-2009
20100188021ELECTRONIC BALLAST AND METHOD FOR OPERATING AT LEAST ONE DISCHARGE LAMP - An electronic ballast is provided, including first a second input connections for connecting an alternating supply voltage; an EMC filter; a rectifier; a capacitor for providing the DC operating voltage for the output stage; and a power factor correction device, which comprises a number n of partial devices for power factor correction, as well as a control device for controlling the number n of partial devices, the power to be provided at the output of the power factor correction device being a total power currently to be provided, the power to be provided by the partial device i being a currently to be provided partial power of the partial device i. The control device is configured to control at least first and second partial devices as a function of the currently to be provided total power in such that their currently to be provided partial powers differ from one another.07-29-2010
20100207547SWITCHING POWER SUPPLY FOR AN ILLUMINATION DEVICE WITH PRECISION CURRENT CONTROL - A system and method for powering a light-emitting element in an illumination device includes a DC power supply with the light-emitting element coupled across a positive output terminal and a negative output terminal of the DC power supply. A switching element is coupled between the light-emitting element and the negative output terminal. An average current value across the light-emitting element is measured each time the switching element is turned on. A control circuit generates a PWM signal having a pulse width determined based on the calculated average current value and a predetermined target value, and applies the PWM signal to drive the switching element on and off in accordance with the determined pulse width, and a current is generated across the light-emitting element.08-19-2010
20100259195ELECTRONIC BALLAST FOR AN HID LAMP WITH LAMP RE-START CONTROL - An electronic ballast for a high intensity discharge lamp includes a control circuit for switching between a first operation period to operate a starting voltage generating circuit to start the lamp and a second operation period to maintain a steady arc discharge after the lamp has started, based on a detection result from a lighting detector circuit. The control circuit further includes a measurement circuit to measure operation information of the first operation period, circuits to control operation during the first operation period based on a result of measurement from the measurement circuit, and a reset circuit to initialize the operation information of the first operation period measured by the measurement circuit upon continuation of the second operation period for a reference time or longer.10-14-2010
20130214702POWER CONVERTER WITH COMPENSATION CIRCUIT FOR ADJUSTING OUTPUT CURRENT PROVIDED TO A CONSTANT LOAD - A method for use in a power converter includes generating a peak input voltage signal that is representative of a peak value of the input voltage for phase angles less than a phase angle threshold and is representative of a value that is less than the peak value of the input voltage for phase angles greater than the phase angle threshold. The method also includes controlling a switching of a switch to regulate an output current of the power converter in response to the peak input voltage signal and the feedback signal. A compensation current is then added to the peak input voltage signal when the phase angle is greater than the phase angle threshold to allow for natural dimming at an output of the power converter.08-22-2013
20090045759BACKLIGHT UNIT, DISPLAY APPARATUS COMPRISING THE SAME AND CONTROL METHOD THEREOF - Provided is a display apparatus including: a display panel; a light source which includes a plurality of light source modules and supplies light to the display panel; a light source driver which drives the light source modules; a power source which supplies power to the light source driver; a current detector which detects a current of the power supplied from the power source to the light source driver; and a controller which controls the light source driver to sequentially drive the plurality of light source modules and compares the detected current with a range to detect errors from the respective light source modules.02-19-2009
20100194309CONTROLLER FOR DISCHARGE LAMP AND LIGHT SOURCE DEVICE - A control circuit for a discharge lamp, which can improve the lighting performance of the discharge lamp while realizing low power consumption, and a light source device are provided. The resistance value of the variable resistor (R08-05-2010
20100225250DRIVE CIRCUIT OF DC/DC CONVERTER, LIGHT EMITTING APPARATUS AND ELECTRONIC DEVICE USING THE SAME - A drive circuit controls the on/off state of a switching transistor of a DC/DC converter. A first resistor is provided on a path of current flowing through a primary coil of a transformer connected to the switching transistor, and one end of the first resistor is grounded. A second resistor is provided on a path of current flowing through a secondary coil of the transformer, and one end of the second resistor is grounded. A switching controller turns off the switching transistor when a first detection voltage exceeds a first threshold voltage and, turns on the switching transistor after lapse of predetermined delay time since a second detection voltage exceeds the second threshold voltage.09-09-2010
20100277103LED DIMMER DEVICE ADAPTED FOR USE IN DIMMER - A LED dimmer device for use in dimmer is provided. The LED dimmer device includes rectifier, voltage boost device, pre-voltage detection circuit and after-voltage detection circuit adapted for detect voltage, master chip adapted for driving circuit and elements to work, elementary transformer and secondary transformer adapter for changing voltage, secondary rectifier adapted for rectifying and secondary filter capacitance circuit adapter for filtering, and secondary switch tube. The rectifier is adapted for transforming alternating current into direct current. The voltage boost device includes a metal oxide semiconductor field effect transistor used to make dimmer entering into a normal edge state. The master chip includes integrated comparing element used to compare voltage. The secondary switch tube is used to driving elementary transformer and secondary transformer, secondary rectifier, secondary filter capacitance circuit so as to drive LED power supply to illuminate.11-04-2010
20100277101ELECTRONIC BALLAST WITH DIMMING CONTROL FROM POWER LINE SENSING - The present invention discloses an electronic ballast with dimming control from power line sensing for a fluorescent lamp, comprising: a line switching sensing circuit, used to generate a switching sensing signal by performing a voltage comparison operation on a DC voltage; an oscillating signal gating unit, used to gate an oscillating signal with a pulse signal to generate a gated oscillating signal, wherein the pulse width of the pulse signal is generated according to the switching sensing signal; and a non-overlapping driver, used to generate a high side driving signal and a low side driving signal according to the gated oscillating signal.11-04-2010
20100277100ELECTRONIC BALLAST WITH DIMMING CONTROL FROM POWER LINE SENSING - The present invention discloses an electronic ballast with dimming control from power line sensing for a fluorescent lamp, comprising: a line switching sensing circuit, used to generate a switching sensing signal by performing a voltage comparison operation on a DC voltage, and generate a reset signal according to the off time of the power line; a control voltage generator, used to generate a control voltage according to the count of said switching sensing signal; a voltage controlled oscillator, used to generate an oscillating signal according to the control voltage; and a non-overlapping driver, used to generate a high side driving signal and a low side driving signal according to the oscillating signal.11-04-2010
20100213875Power Supply Controlling Device - A power supply controlling device includes a main controlling unit, the main controlling unit stores daily sunrise and sunset time data from January 108-26-2010
20100237804CONSTANT BRIGHTNESS CONTROL FOR ELECTROLUMINESCENT LAMP - A ballast (09-23-2010
20110175552METHOD OF DRIVING A LIGHT SOURCE, METHOD OF DISPLAYING AN IMAGE USING THE SAME, AND DISPLAY APPARATUS FOR PERFORMING THE SAME - A method of driving a light source includes converting a reference luminance value of the light source to a first just noticeable difference (JND) value. The JND value represents a minimum noticeable difference between two stimuli. A target luminance value lower than the reference luminance value is determined using the first JND value. A first driving signal applied to the light source is generated using the target luminance value so that a user may not notice a luminance change when a luminance value of a light source is decreased in order to decrease power consumption of a display apparatus.07-21-2011
20110006707DEVICE FOR GENERATING LIGHT WITH A VARIABLE COLOR - An illumination system (01-13-2011
20110006706LATCH-OFF OF REAL TIME SYNCHRONOUS RECTIFICATION FOR LIGHT LOAD CONTROL - The present invention discloses a light load control circuit and the method accordingly where the synchronous rectification is latched off selectively according to the gate voltage of the synchronous rectifier.01-13-2011
20120187868LASER INSTRUMENT AND METHOD FOR ADJUSTING THE LASER POWER - A laser instrument and a method for adjusting the laser power is disclosed. The laser instrument includes a laser device which generates a laser beam and a rotating device which moves the laser device back and forth around an axis of rotation between a first turning point and a second turning point. The laser beam generates a laser line between a first end point and a second end point on a target surface. A control device is provided which adjusts the laser power of the laser beam as a function of a rotation angle and/or an angular velocity of the rotating device.07-26-2012
20100219773LIGHT-EMITTING DIODE CONTROLLER - Light-emitting diode controller 09-02-2010
20110012538LATCH-OFF OF SYNCHRONOUS RECTIFICATION FOR LIGHT LOAD CONTROL - Disclosed is a light load control circuit and the method accordingly where the synchronous rectification is latched off when the light load condition is detected for several successive cycles.01-20-2011
20110101887METHOD OF VIEWING A SUBJECT - A method and apparatus are provided for viewing a subject. The method includes the steps of providing a predetermined visual contrast among image details of the subject and maintaining the visual contrast for a predetermined time period of less than 100 milliseconds.05-05-2011
20100253244Fluorescent Lamp Dimming Controller Apparatus and System - A dimming controller and system is provided in either discrete or integrated form and includes a single electronic controller device and a dimming ballast for installation in an overhead fluorescent fixture. The system functions to sense power line changes caused by the flicking of a switch between OFF and ON and controls the light dimming accordingly. The power line changes may be either changes in mains frequency or user caused switch toggling.10-07-2010
20110057580Control of Delivery of Current Through One or More Discharge Lamps - Systems and techniques to control of delivery of current through one or more lamps include, in at least one aspect, a method comprising: receiving an electric signal from a resistor in a circuit, where the resistor is selected based on a lamp; determining that a value associated with the electric signal falls in a preset range of values, the preset range having one or more parameters that correspond to the lamp; and outputting the one or more parameters to operate the lamp.03-10-2011
20120194099ELECTROLUMINESCENT DEVICE AGING COMPENSATION WITH MULTILEVEL DRIVE - Compensation for aging of an electroluminescent (EL) emitter having a luminance and a chromaticity that both correspond to the density of the current and the age of the EL emitter is performed. Different black, first and second current densities are selected based on the measured age, each corresponding to emitted light colorimetrically distinct from the light emitted at the other two current densities. Respective percentages of a selected emission time are calculated for each current density to produce a designated luminance and chromaticity. The current densities are provided to the EL emitter for the calculated respective percentages of the emission time so that the integrated light output of the EL emitter during the selected emission time is colorimetrically indistinct from the designated luminance and chromaticity, no matter the age of the EL emitter.08-02-2012
20080315796Backlight modulation circuit and method thereof - A backlight modulation circuit includes an illumination controlling signal generating circuit, an illumination control signal separating circuit, and an illumination modulation circuit. The illumination controlling signal generating circuit is configured for receiving an modulation signal and generating an illumination controlling signal according to the modulation signal. The illumination control signal separating circuit is configured for separating the illumination controlling signal into a first modulation signal and a second modulation signal. The illumination modulation circuit is configured for modulating illumination of a backlight module according to the first and second modulation signals.12-25-2008
20130127372POWER SUPPLY FOR XENON LAMPS IN AN ACCELERATED WEATHERING TEST APPARATUS - A power supply for use in an accelerated weathering test apparatus can control both the xenon lamp radiated spectrum and its intensity in order to fully simulate the sun's daily cycle, improve the ultraviolet output, reduce the infrared radiation, and compensate for the xenon lamp aging.05-23-2013
20090256497BACKLIGHT DEVICE - A backlight device that is not affected by offset voltage. Driving transistor 10-15-2009
20090322255Apparatus and method for driving and adjusting light - An apparatus and method for driving and adjusting light is provided, applicable to the LED lighting environment. Without the necessity to change the existing wiring and lighting devices, the driving and light adjusting apparatus of the present invention can cooperate with LED driver, by counting the number of switch ON/OFF times, to enable the LED driver to adjust light so that the LED lighting device is capable of light adjustment in addition to lighting.12-31-2009
20090072762Backlight control circuit and method for driving same - An exemplary backlight control circuit includes a transformer, a control circuit, a lamp. The control circuit and the transformer form an inverter circuit to providing an alternating current (AC) voltage for driving the lamp. When the backlight control circuit works in a startup mode, the backlight control circuit defines a first current path including the lamp and the first current path forms a first resonant circuit. When the backlight control circuit works in an operation mode, the backlight control circuit defines a second current path including the lamp and the second current path forms a second resonant circuit. The first and second resonant circuits have different resonant frequencies from each other.03-19-2009
20090167211METHOD OF DRIVING A DISCHARGE LAMP, AND DRIVING UNIT - The invention describes a method of driving a discharge lamp (07-02-2009
20080303454Fluorescent Tube Lamp Drive Circuit - A drive circuit for driving a fluorescent tube lamp comprises a variable frequency oscillator generating a lamp drive frequency, a resonant drive circuit driving the lamp with the lamp drive frequency, and a control unit for driving the variable frequency of the latter under control of a synchronization signal. When a pre-heating frequency is generated by the variable frequency oscillator, the lamp is pre-heated while when an illumination drive frequency is generated, the lamp ignites and operates in its illuminated state. The control unit comprises a transition controller for at an ignition of the lamp limiting the drive frequency to an ultimate ignition frequency, and only enabling transition from the ultimate ignition frequency to the illumination drive frequency after an ignition delay time.12-11-2008
20090108776CIRCUIT FOR PROVIDING AN APPROXIMATELY CONSTANT RESISTANCE AND/OR CURRENT AND METHOD THEREFOR - A circuit can provide an approximately constant resistance value that is virtually independent of process and temperature variations. A current control circuit may use a device that tracks the changes in a corresponding device over process and temperature variations. As a result, the behavior of device may be used to help determine the control information provided to device in order to maintain an approximately constant resistance Rm over process and temperature variations. The approximately constant resistance Rm may be used to provide an approximately constant current I04-30-2009
20110031901LAMP HAVING SELF-REGULATED LIGHTING - A portable electric lamp comprises a lighting module with LEDs and user control means connected to an electronic control circuit to define different lighting modes. An optic sensor is housed in the casing near the light-emitting diode LED to transmit to the control circuit a signal representative of the lighting induced by the lamp to automatically regulate the power of the LED according to a predefined threshold.02-10-2011
20110031900CONTROLLER AND METHOD OF OPERATING A CONTROLLER - A controller for controlling a power generator circuit, and a method for operation such a controller, is disclosed. The invention is particularly suited to LED current generators. The current generator may be switched off to conserve power when not required for any LED circuits. The method relates to determining the time at which the controller is required to provide power, current or voltage, and to adjust the timing of switching-on of the controller, in order to ensure that power, current or voltage is available for the load when required.02-10-2011
20090108777Devices and systems that deliver nitric oxide - The present disclosure relates to dressings, such as patches and bandages, and other devices and systems that deliver nitric oxide.04-30-2009
20100295480Method for the Operation of and Circuit Arrangement for Light Sources - A method for the closed-loop control of the operation of a light source which is supplied with power by a DC/DC voltage converter, a manipulated variable being regulated by a setpoint value for an operational parameter of the DC/DC voltage converter being input, wherein the method comprises the steps of: increasing the switching frequency of the DC/DC voltage converter by an increase value prior to rapid changes in the setpoint value; waiting for a retention time; setting the new setpoint value; waiting for the end of a total retention time; and lowering the switching frequency of the DC/DC voltage converter by the increase value.11-25-2010
20100301775Gradual Power Reduction Circuit - Systems and methods to gradually reduce power to a load are disclosed. A method includes initializing a control circuit that is configured to transition from an initial state to a steady state. A first portion of an AC power cycle that is received at the input terminal is selectively blocked from passing to a load terminal. A second portion of the AC power cycle is selectively passed to the load terminal based on an output of the control circuit.12-02-2010
20110127929LED ILLUMINATION SYSTEM WITH A POWER SAVING FEATURE - An LED illumination system includes a control circuit having a timing unit, a control unit and a PWM signal generating unit. The timing unit divides an operating period of an LED lamp into a plurality of time segments, and outputs a clock signal at a start of each time segment to the control unit. The control unit outputs different controlling signals corresponding to the clock signals to the PWM signal generating unit, which in turn generates different PWM signals with different duty cycles. A constant current circuit electrically connects the control circuit to the LED lamp. The constant current circuit outputs different electric currents to the LED lamp according to the PWM signals, to thereby control the LED lamp to emit light having different light intensities at the various time segments of the operating period.06-02-2011
20110248649SYSTEMS AND METHODS FOR A DIGITAL-TO-CHARGE CONVERTER (DQC) - Systems and methods for a digital-to-charge converter (“DQC”) are disclosed. A DQC may include a converting circuit configured to receive a first digital signal indicative of a voltage across a capacitor coupled to an output pin of the digital-to-charge converter and to determine a present charge of the capacitor based at least in part on the first digital signal. The DQC may also include an error determining circuit coupled to the converting circuit, wherein the error determining circuit is configured to receive a second digital signal indicative of a target charge via an input pin of the digital-to-charge converter and to determine a difference between the target charge and the present charge. The DQC may further include a correction circuit coupled to the error determining circuit and configured to control a programmable current source to produce an analog signal at the output pin in response to the determined difference.10-13-2011
20100225251LED DRIVE CIRCUIT, LED LAMP, LED LIGHTING APPLIANCE, AND LED LIGHTING SYSTEM - An LED drive circuit receives an alternating-current voltage and drives an LED. The LED drive circuit has a current extractor which extracts a current from the current supply line through which an LED drive current is supplied to the LED, and a timing adjuster which adjusts the current extraction start timing and the current extraction duration in the current extractor.09-09-2010
20100134049LED LAMP-LIGHTING CIRCUIT AND LED LAMP AS WELL AS AN LED LAMP-LIGHTING CONVERSION SOCKET - To stably illuminate an LED lamp even when an internally-excited electronic transformer is used in the power supply circuit, the full wave of the AC voltage supplied from the power supply circuit is rectified using a current rectifying circuit. When the power supply starts, current flows into a start-assist circuit for a specific period of time. Subsequently, when the fixed current load circuit begins operating, the current will flow into the fixed current load circuit. When the current flows into the LED driver, operation of the fixed current load circuit is stopped by a current-stopping circuit. Because the current flows into the lamp-lighting circuit across the entire voltage output even when an internally-excited electronic transformer is used in the power supply circuit, operation of the internally-excited electronic transformer will not stop and will not become unstable. When the LED is not connected, the fixed current load circuit is stopped.06-03-2010
20110109249DIMMABLE LED LAMP AND DIMMABLE LED LIGHTING APPARATUS - A dimmable light-emitting diode (LED) lamp and a dimmable LED lighting apparatus thereof are provided. The dimmable LED lamp includes a bridge rectifier, a toggle detector, a sustain voltage supply circuit, a counter, an LED light source, and an LED lighting driver. The bridge rectifier receives a source alternating current (AC) voltage through a wall switch and provides a rectified direct current (DC) voltage. The toggle detector monitors a toggle action of the wall switch. The sustain voltage supply circuit provides a sustain voltage. The counter receives the sustain voltage for operation. Moreover, the counter stores and provides an counting value that changes when the toggle detector detects the toggle action. The LED lighting driver converts the rectified DC voltage to a constant current to drive the LED light source. The LED lighting driver also provides multi-level dimming to the LED light source according to the counting value.05-12-2011
20110025233Method and Apparatus For Reduction of Excess Current During Initial Firing of Arc Lamp Circuits - Arc lamps, including low-pressure arc lamps, are coupled to drive circuitry operable to provide drive signals that reduce or eliminate excess current when the lamp arc is struck. The drive circuitry controls the rate at which a lamp can fire by actively controlling the rate the voltage pulse increases. Prior to enabling the drive pulse burst, the frequency is shifted only part of the way towards the normal operating frequency in a single step, then allowed to approach the normal operating frequency in a fashion that is selected based at least in part upon the specific type of lamp being used. Typically, the rate of change of the frequency is linear.02-03-2011
20110241570INTELLIGENT SOFT START CONTROL TO REDUCE ELECTROSTATIC DISCHARGE CLAMP CURRENT SPIKES - Systems and methods of regulating a power supply may involve ramping an output voltage of the power supply toward an operating voltage level at a first slew rate in response to detecting a soft start condition of the power supply. A determination can be made as to whether the output voltage has exceeded an intermediate voltage level and, if so, the output voltage may be ramped toward the operating voltage level at a second slew rate. The first slew rate can be substantially less than the second slew rate in order to prevent an electrostatic discharge pump from activating.10-06-2011
20110025234LIGHT-EMITTING-ELEMENT DRIVING CIRCUIT - A light-emitting-element driving circuit is provided which comprises a voltage boosting circuit unit which supplies a boosted voltage to a light-emitting element, a current circuit unit which drives the light-emitting element with a current, a normal feedback loop path through which a voltage of the light-emitting element is input as a feedback voltage to the voltage boosting circuit unit, a backup feedback loop path through which a voltage of the light-emitting element is input as the feedback voltage to the voltage boosting circuit unit, an abnormality detection circuit unit which compares the feedback voltage which is input through the normal feedback loop path to the voltage boosting circuit unit and a predetermined determination voltage, to detect abnormality, and a switching circuit which switches from the normal feedback loop path to the backup feedback loop path when the abnormality detection circuit unit has detected the abnormality.02-03-2011
20110018467INTELLIGENT CONTROL MODULE AND METHOD FOR LIGHTING LAMP - An intelligent control module for lighting lamp is applied to a switch unit, a lamp control interface and a lamp. The intelligent control module for lighting lamp includes a dimming signal output sub-module and a display sub-module electrically connected to the dimming signal output sub-module. The dimming signal output sub-module includes a dimming microprocessor. The display sub-module includes a display microprocessor and a display unit electrically connected to the display microprocessor. The dimming signal output sub-module and the display sub-module are electrically connected to the switch unit. A dimming and timing signal is sent by the dimming microprocessor according to a switching-on time and duration of the switch unit and provided for controlling the lamp control interface to drive the lamp. A display signal is transmitted by the display microprocessor to drive the display unit according to the switching-on time and duration of the switch unit.01-27-2011
20090066266INTEGRATED POWER AND CONTROL UNIT FOR A SOLID-STATE LIGHTING DEVICE - The present invention provides an integrated power and control unit for use with a solid-state lighting device. The integrated power and control unit comprises a power input and a data input. The power input receives power from a power source, wherein this power is configured in a first power format and the data input receives control data from a control data source, wherein the control data is configured in a first data format. The integrated power and control unit further comprises a translation device coupled to the power input and the data input. The translation device is configured to convert the power in the first power format to power in a second power format and further configured to convert the control data in the first data format to control data in a second data format. The second power format and second data format are compatible with the required power and data formats of the solid-state lighting device and transmit the required power and data formats of the solid-state lighting device using a power and data output.03-12-2009
20100327775HIGH PRESSURE DISCHARGE LAMP LIGHTING DEVICE AND LIGHTING FIXTURE USING THE SAME - A high pressure discharge lamp lighting device comprising an inverter, an igniter, a controller, a pulse voltage detection circuit, and the starting pulse voltage regulation circuit. The inverter applies a lighting voltage to a high pressure discharge lamp. The controller applies the starting pulse voltage generated by the igniter to the high pressure discharge lamp. The pulse voltage detection circuit is configured to detect a voltage indicative of the starting pulse voltage to output a detection signal. The starting pulse voltage regulation circuit is configured to regulate the starting pulse voltage to a desired value of the starting pulse voltage on the basis of the detection signal. The pulse voltage detection circuit is configured to detect either one of the voltage developed in the specified circuit component of the igniter and the starting pulse voltage as the voltage indicative of the voltage indicative of the starting pulse voltage.12-30-2010
20110043140CHARGE PUMP CIRCUIT WITH CURRENT DETECTING AND METHOD THEREOF - The present invention relates to a charge pump circuit with current detecting and a method thereof. The current detecting charge pump circuit includes a controlled current source, a load circuit which electrically connects to the charge pump circuit unit, and is driven by the charge pump circuit unit to generate a load current. A detecting circuit unit electrically connects to the load circuit, and produces a feedback signal according to the load circuit. A feedback circuit unit which electrically connects to the detecting circuit unit, receives the feedback signal, and adjusts a current of the controlled current source according to the feedback signal. The charge pump circuit also includes a protecting circuit unit which is able to detect feedback signal to protect the circuit according to the feedback signal.02-24-2011
20110043139LED DRIVING CIRCUIT AND DRIVING CONTROLLER FOR CONTROLLING THE SAME - A driving controller for driving a load is disclosed. The driving circuit includes a driving power supply and the driving controller. The driving power supply provides a first power source to the load. The controller is coupled to a second power source to receive an electric power for operating. The controller controls the amount of the electric power to the load when operating in a first mode and stops the driving power supply from providing the electric power to the load when operating in a second mode. The controller operates exclusively in the first mode before the driving power supply provides the first power source to the load.02-24-2011
20110062893LIGHTING DEVICE, LIGHTING CONTROL DEVICE, AND PROJECTOR - A lighting device which supplies power to an electrode of a discharge lamp to turn on the discharge lamp, includes: a converting circuit which converts inputted direct current into alternating current; a pulse generating circuit which produces a high-voltage pulse from the alternating current received from the converting circuit and applies the high-voltage pulse to the electrode; and a trigger circuit which is disposed between the converting circuit and causes the pulse generating circuit to apply the high-voltage pulse to the electrode, wherein the trigger circuit allows the pulse generating circuit to apply the high-voltage pulse to the electrode in accordance with a drive frequency of the converting circuit.03-17-2011
20110115412POWER CONVERTER FOR AN LED ASSEMBLY AND LIGHTING APPLICATION - The present invention relates to a power converter for an LED assembly, the power converter comprising—a switched mode power supply arranged to power the LED assembly, an AC/DC converter arranged to provide a DC supply voltage to the switched mode power supply, a control unit arranged to receive an input signal representing a required load voltage for powering the LED assembly, the control unit being arranged to control the AC/DC converter based on the input signal.05-19-2011
20120242252CONTROL CIRCUIT AND CONTROL METHOD FOR DIMMING LED LIGHTING CIRCUIT - The present invention provides a control circuit for dimming LED lighting. The control circuit comprises a voltage divider, a controller and an adaptive bleeder. The voltage divider receives an input voltage from an input terminal to generate a dimming signal. The controller generates a switching signal in response to the dimming signal. The controller further generates a control signal in response to the input voltage. The adaptive bleeder receives the control signal and draws a bleeder current from the input terminal in response to the control signal.09-27-2012
20100164406SWITCHING POWER CONVERTER CONTROL WITH TRIAC-BASED LEADING EDGE DIMMER COMPATIBILITY - In at least one embodiment, a controller allows triac-based dimmer to properly function and dim a load whose voltage is regulated by a switching power converter. In at least one embodiment, the switching power converter includes a switch to control voltage conversion of an input voltage to the switching power converter, wherein phase delays are introduced in the input voltage by a triac-based dimmer during a dimming period. In at least one embodiment, the controller is configured to control the switch of the switching power converter to establish an input resistance of the switching power converter during a dimming portion of the input voltage, wherein the input resistance allows the triac-based dimmer to phase modulate a supply voltage to the dimmer so that an output voltage of the dimmer has a substantially uninterrupted phase delay during each half-cycle of the supply voltage during the dimming period.07-01-2010
20100164408LIGHT SOURCE CONTROL DEVICE - A light source control device is provided. A switching seat includes a switching key and a sensing device. A switching circuit is disposed between an external power source and a control circuit to disconnect or connect the external power source, and includes a mechanical switch, an electronic switch and a sensing unit. The mechanical switch is directly connected to the switching key, and is controlled to turn on or off by switching the switching key. The electronic switch is coupled to the sensing unit, and the sensing unit generates a sensing signal to control the electronic switch to turn on or off when the sensing device senses an excitation. The control circuit provides varied power supply to a light source according to the received signal.07-01-2010
20100164407SENSING TYPE CONTROL CIRCUIT FOR ELECTRONIC APPARATUS - A sensing type control circuit for an electronic apparatus is provided. An output unit is coupled between an external power source and the electronic apparatus and provides varied power supply to the electronic apparatus according to a control signal. A switch is coupled between the external power source and the output unit and disconnects or connects the external power source. A control unit receives a sensing signal and generates the control signal to the output unit according to the received signal. A sensing unit includes a sensing device and senses an external variation, wherein the sensing unit generates the sensing signal to the control unit when the sensing device senses an excitation.07-01-2010
20110241571Correction circuit, drive circuit, light-emitting device and correction method of current pulse waveform - A drive circuit and a drive current correcting method are described herein. The drive circuit comprises a current source that outputs a drive current, and a correction circuit that outputs a correction current. The correction circuit includes a first RC time constant circuit. An output terminal of the current source is connected to an output terminal of the correction circuit.10-06-2011
20090322256DRIVE CIRCUIT - Provided is a drive circuit for a light emitting device, which compensates for a decrease in luminance of the light emitting device and reduces a burn-in phenomenon. The drive circuit includes: a first capacitor connected to a gate of a drive transistor; and a second capacitor formed between the first capacitor on a side to which the gate of the drive transistor is not connected, and one end of a light emitting device. The drive circuit corrects an amount of charge of the first capacitor according to a change in potential of the node when the light emitting device starts illumination, and then, causes the light emitting device to illuminate according to the corrected amount of charge.12-31-2009
20090322254Apparatus and method for driving and adjusting light - An apparatus and method for driving and adjusting light is provided, applicable to the LED lighting environment. Without the necessity to change the existing wiring and lighting devices, the apparatus and method for driving and light adjusting apparatus of the present invention can enable the LED driver to adjust light so that the LED lighting device is capable of light adjustment. The apparatus and method for driving and adjusting light of the present invention lets the LED driver output stably to drive LED when the input voltage to the LED driver changes so that the LED brightness can maintain stable without flickering regardless of the unstable input voltage as well as with high efficiency and low variation of LED color temperature. In this manner, in addition to the lighting capability, the LED lighting device also has the light adjustment capability because the LED driver has the light adjustment capability.12-31-2009
20100039048Inverter controller and system - A driving circuit for driving loads includes a switch circuit, a transformer, a current sensing circuit, and an inverter controller. The switch circuit and the transformer are used for converting a DC electric power to an AC electric power so as to energize the loads. The current sensing circuit coupled to the loads generates a feedback current signal indicative of a current flowing through the loads. The inverter controller includes a switch drive circuit, a current regulation circuit receiving the feedback current signal, and a mode controller circuit. The switch drive circuit controls the switch circuit so as to adjust power delivered to the primary winding of the transformer in accordance with the feedback current signal. The mode controller disables the switch circuit through the switch drive circuit if the external signal is in an absence state for a predetermined period.02-18-2010
20120242253METHOD AND DEVICE FOR DRIVING A FLUORESCENT LAMP - A method is described for driving a fluorescent lamp (L) with variable light output within a dimming range between a low dimming level and a high dimming level. The lamp power and the lamp current are monitored. At high dimming level the lamp control is based on current control; at low dimming level, the lamp control is based on power control; at intermediary levels the lamp control is based on both current and power control. A first measuring signal (Ilamp) indicating lamp current and a second measuring signal (Plamp) indicating lamp power are obtained. An error signal (Serr) is calculated as a function of the said two measuring signals and as a function of dim level. With increasing dim level, the contribution of the first measuring signal (Il-amp) to the error signal (Serr) increases while the contribution of the second measuring signal (Plamp) to the error signal (Serr) decreases.09-27-2012
20110248650Power Tool with Light Unit - A power tool includes a housing coupled to an electrical power source, a motor contained in the housing, and a motor control circuit that controls output speed of the motor. A light unit is coupled to the housing to illuminate a work surface. A light unit control circuit controls illumination of the light unit. A switch unit is coupled to the housing and selectively operable to control the operation of the motor control circuit and the light unit control circuit. The light unit control circuit includes a timer configured to cause the light unit to illuminate a first brightness level when the switch unit is actuated, and to remain illuminated at the first brightness level for a predetermined time period after the trigger is actuated. The predetermined time period restarts if the switch unit is not deactivated before the end of the predetermined time period.10-13-2011
20110074314SYSTEM AND METHOD FOR CONTROLLING ELECTRICAL POWER OF LED AND LED PROJECTOR HAVING THE SAME - A method for controlling electrical power of light emission diodes (LED) is provided. The above method comprises steps of providing a supply voltage to the LED driver; providing a driving current to the LED by the LED driver; obtaining an operating voltage of the LED; and adjusting the supply voltage according to the operating voltage of the LED.03-31-2011
20110101886LOAD CONTROL CIRCUIT - A switch device controls a voltage applied to a load element according to an electric power supply from a power source. A driver circuit controls activation and deactivation of the switch device. A circuit portion sets a duty ratio and output the duty ratio to the driver circuit for causing the driver circuit to activate the switch device according to the duty ratio to control a voltage applied to the load element. The circuit portion sets the duty ratio according to a duty ratio characteristic curve. In the duty ratio characteristic curve, the duty ratio decreases gradually with increase in a voltage of the power source, and decrease in the duty ratio with increase in the voltage of the power source becomes small gradually.05-05-2011
20110068714HIGH PRESSURE DISCHARGE LAMP LIGHTING DEVICE AND ILLUMINATION INSTRUMENT - In an event of switching a DC output voltage of a boost chopper circuit from a first DC output voltage to a second DC output voltage, a boost chopper control circuit operates a boost chopper circuit intermittently. Therefore, a stop period of the boost chopper circuit is shortened as compared with a case where the boost chopper control circuit does not operate the boost chopper circuit intermittently. As a result, it becomes possible to supply a control power also when the DC output voltage of the boost chopper circuit is switched at a starting time of a high pressure discharge lamp while avoiding size and cost increases of a power supply circuit that supplies the control power.03-24-2011
20110068712POWER SUPPLY AND METHOD FOR ELECTRIC LIGHTING DEVICE - Disclosed herein are a power control system (03-24-2011
20110068711METHODS AND APPARATUS FOR CEILING MOUNTED SYSTEMS - Methods and apparatus for ceiling suspended systems according to various aspects of the present invention include a modular platform for supporting and supplying multiple devices. A wire way bar may facilitate connection and support for the devices, such as light sources and other systems.03-24-2011
20100244744METHOD OF DRIVING A GAS-DISCHARGE LAMP - The invention describes a method of driving a gas-discharge lamp (09-30-2010
20100244743LIGHTING EQUIPMENT - An illumination apparatus, which controls a supply power supplied to a lamp according to an accumulated interval of on-time and a light control signal, is configured in which a maximum supply power supplied to the lamp according to the accumulated interval of on-time is supplied to the lamp when the supply power to the lamp corresponding to the light control signal is above the maximum supply power to the lamp according to the accumulated interval of on-time at a point when the illumination apparatus is turned on or the lamp starts lighting. When the light control signal is operated so as to exceed a level of the maximum supply power to the lamp according to the accumulated interval of on-time or the light control signal varies more than a prescribed level, the supply power is shifted to an adjustable condition so as to be higher than the maximum supply power to the lamp according to the accumulated interval of on-time.09-30-2010
20110001439DRIVER ARRANGEMENT FOR LIGHT EMITTING DIODES - A driver arrangement for LEDs may include a PWM controller to deliver a feed voltage between an output line and a ground output line, said controller having a pin, a current regulator to regulate the feed current, a switch to connect said pin to a scaled-down version of the voltage on the first output line, and a control line to receive a signal to produce dimming, said control line coupled to said regulator and said switch to couple said regulator to a reference voltage and control switching, whereby: in one of the levels of a PWM control signal, said regulator interrupts said feed current, the voltage on said ground output line is floating, and in the other levels, said regulator is coupled to said reference voltage, said switch disconnects said pin from said voltage on the output line and the voltage on said ground output line is regulated.01-06-2011
20100295478LED DRIVING CIRCUIT - The present invention provides a LED driving circuit, which is adapted to be coupled to a power supply via a phase control dimmer. The driving circuit comprises a power switch unit and a control unit, wherein the control unit comprises a first signal sampling module, a frequency converting module, a feedback module and a PWM module, the first signal sampling module being configured to sample a first signal and to provide the first signal to the frequency converting module; the frequency converting module being configured to generate a second signal in response to the first signal and to provide the second signal to the PWM module; and the feedback module being configured to sample a third signal and to provide the third signal to the PWM module; the PWM module being configured to generate a fourth signal in response to the second signal and the third signal, so as to control the output current of the power switch unit, the frequency of the fourth signal being determined by the second signal and the duty cycle of the fourth signal being determined by the third signal.11-25-2010
20110254469DIMMING CIRCUIT AND METHOD FOR LEDS - A dimming circuit and method for a LED provide a first driving voltage or a second driving voltage according to a dimming signal provided by a functional IC to enable or disable the LED. The values of the first and second driving voltages are controlled so that overstressing of the LED is avoided while the functional IC is capable of working even when the LED is off. The LED's life time is thus prolonged.10-20-2011
20090261756METHOD OF SHUTTING DOWN A HIGH PRESSURE DISCHARGE LAMP AND DRIVING UNIT FOR DRIVING A HIGH PRESSURE DISCHARGE LAMP - The invention describes a method of shutting down a high pressure discharge lamp (10-22-2009
20110254468VOLTAGE CONVERTER AND DRIVING METHOD FOR USE IN A BACKLIGHT MODULE - A voltage converter for use in a backlight module stores energy of an input voltage using an inductor and outputs a plurality of output voltages accordingly. The charging path of the inductor is controlled according to the first output voltage so that the first output voltage can be stabilized. The discharging paths from the inductor to other output voltages are controlled according to the differences between other output voltages and the first output voltage so that other output voltages can also be stabilized.10-20-2011
20080203945Describing Two Led Colors as a Single, Lumped Led Color - A light emitting diode (LED) lighting system for producing white light is disclosed. The system comprises sets of LEDs arranged to emit light with different wavelength ranges and associated with different sets of characteristics, and a driving circuit arranged to drive the LEDs. The driving circuit comprises an input for desired light intensity, color rendering index, and color temperature, an input for signals for LED temperature, a model for determining driving currents for said sets of LEDs from said parameters, signals, and characteristics for each of said sets of LEDs; and a current driver for the LEDs. At least one of the sets of LEDs comprises a first subset of LEDs with a first wavelength sub-range and a first set of characteristics, and a second subset of LEDs with a second wavelength sub-range and a second set of characteristics. A lumped wavelength range of the set of LEDs is a range of said first and second wavelength sub-ranges, and the set of characteristics of the set of LEDs is a function of said first and second sets of characteristics. A method for controlling the sets of LEDs is also disclosed.08-28-2008
20110163695POWER SUPPLY UNIT AND METHOD FOR CONTROLLING A POWER SUPPLY UNIT - A power supply unit is provided which comprises an AC/DC conversion unit with an input to which an input voltage is coupled and an output to which a DC bus voltage is coupled. The power supply unit furthermore comprises a DC bus capacitor which is coupled to the output of the AC/DC conversion unit. The power supply unit furthermore comprises at least one sub-power supply unit receiving the DC bus voltage as input for providing at least one power supply. The power supply of the at least one sub-power supply unit or part of the load is at least reduced or switched off if the input voltage falls below a predetermined threshold value.07-07-2011
20110133673LED DRIVING CIRCUIT HAVING ERROR DETECTION FUNCTION - There is provided an LED driving circuit. An LED driving circuit according to an aspect of the invention may include: a shift register separating dimming data and control data from serial peripheral interface (SPI) data and outputting the dimming data and the control data in predetermine data units; a scan register generating scan data according to the control data from the shift register; a first error detection unit detecting an error in the dimming data from the shift register; a second error detection unit detecting an error in the scan data from the scan register; and a logic operation unit performing an OR operation on an output signal from the first error detection unit and an output signal from the second error detection unit.06-09-2011
20110080119CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A circuit for driving a light source, e.g., an LED light source, includes a converter, a sensor, and a controller. The converter converts an input voltage to an output voltage across the LED light source based upon a driving signal. A duty cycle of the driving signal determines an average current flowing through the LED light source. The sensor is selectively coupled to and decoupled from the converter based upon the driving signal. The sensor generates a sense voltage indicative of a current flowing through the LED light source when the sensor is coupled to the converter. The controller is coupled to the converter and sensor. The controller compares the sense voltage to a reference voltage indicative of a predetermined average current through the LED light source to generate a compensation signal and generates the driving signal based upon the compensation signal. The duty cycle of the driving signal is adjusted based upon the compensation signal to adjust the average current flowing through the LED light source to the predetermined average current.04-07-2011
20110260651CONTROL CIRCUIT OF LIGHT-EMITTING ELEMENT - A control circuit of a light-emitting element comprises a rectifying unit (10-27-2011
20110260650DEVICE FOR CONTROLLING POWER SUPPLY TOWARDS LIGHT SOURCES AND RELATED METHOD - In various embodiments, a device for controlling power supply towards at least one light source comprising a load having a value variable as a result of switching of at least one switch coupled thereto, is provided. The device may include: a power supply set controllable to determine the intensity of the current fed towards said load; a current feedback loop sensitive to the intensity of the current fed towards said load, said current feedback loop connected to said power supply set to maintain the intensity of the current fed towards said load upon variation of said load; and a voltage control sensitive to the voltage across said load, said voltage control likewise connected to said power supply set to maintain the intensity of the current fed towards said load upon variation of said load.10-27-2011
20120146549Power Supply System for Electronic Loads - The invention relates to a power supply system and a method for providing a load (L) with electrical power from either a first or a second AC grid source (06-14-2012
20100259194DEVICE FOR DRIVING A LOAD10-14-2010
20100060202Lighting System with Lighting Dimmer Output Mapping - A system and method map dimming levels of a lighting dimmer to light source control signals using a predetermined lighting output function. The dimmer generates a dimmer output signal value. At any particular period of time, the dimmer output signal value represents one of multiple dimming levels. In at least one embodiment, the lighting output function maps the dimmer output signal value to a dimming value different than the dimming level represented by the dimmer output signal value. The lighting output function converts a dimmer output signal values corresponding to measured light levels to perception based light levels. A light source driver operates a light source in accordance with the predetermined lighting output function. The system and method can include a filter to modify at least a set of the dimmer output signal values prior to mapping the dimmer output signal values to a new dimming level.03-11-2010
20100060204POWER SUPPLY UNIT HAVING DIMMER FUNCTION AND LIGHTING UNIT - In a power supply unit, if a dimmer rate is changed within a range of k03-11-2010
20100060203OMNI VOLTAGE DIRECT CURRENT POWER SUPPLY - A battery operated LED lighting apparatus including: a battery outputting a battery voltage; a light emitting diode or array of light emitting diodes; and a power supply including a boost regulating circuit. The power supply being in communication with the battery and the light emitting diodes such that a constant voltage or constant current is supplied to the light emitting diodes as the battery discharges and the battery voltage falls below the output voltage. In a preferred embodiment the power supply further includes a buck regulator to maintain the proper output voltage when the battery voltage is greater than the output voltage.03-11-2010
20080218101SOFT START CONTROL CIRCUIT FOR LIGHTING - A low voltage lighting system includes a transformer having at least a primary winding and a secondary winding. The low voltage lighting system also includes one or more lighting elements and a voltage control circuit. The lighting elements are coupled to the secondary winding. The voltage control circuit is electrically coupled with the primary winding. The voltage control circuit is configured to automatically increase the voltage applied to the primary winding of the transformer in a predetermined manner from a first voltage to a second voltage over a predetermined period of time.09-11-2008
20110187288DISCHARGE LAMP LIGHTING DEVICE - A discharge lamp lighting device capable of preventing magnetic saturation of an inductor connected with an output of an inverter. An inverter 08-04-2011
20110187287BALLAST CONFIGURED TO COMPENSATE FOR LAMP CHARACTERISTIC CHANGES - A ballast (08-04-2011
20110187289LIGHT SOURCE DRIVER - A light source driver supplies a driving voltage, obtained by the multiplication of an input voltage, to a light source, especially to an LED array. The light source driver includes a power converting part switching an input power to be converted into a first power having a predetermined voltage level; and a multiplying part including at least one multiplying cell having at least one capacitor charging and discharging the first power according to the switching of the power converting part and at least one diode providing a path for transmitting the first power according to the switching of the power converting part, multiplying the first power to thereby transmit a driving power to at least one light source, and being configured as a closed loop in which the capacitor and the diode are connected to an input terminal of the power converting part through which the input power is inputted.08-04-2011
20110187286Switching Circuit Having Delay For Inrush Current Protection - A two-wire switching circuit can handle a large inrush current, but does not require a neutral connection or a heavy-duty mechanical switch or relay. The switching circuit comprises a mechanical air-gap switch, a first controllably conductive device (e.g., a bidirectional semiconductor switch), and a second controllably conductive device (e.g., a latching relay), which are all adapted to be coupled between an AC power source and an electrical load when the air-gap switch is in a first position. First and second delay circuits control the semiconductor switch and the latching relay to be conductive at different times after the air-gap switch is changed to the first position. Specifically, the semiconductor switch is rendered conductive before the latching relay is rendered conductive, such that the semiconductor switch conducts the large inrush current. The latching relay conducts current from the AC power source to the electrical load after the inrush current has subsided.08-04-2011
20110148326TWO-WIRED LED LIGHT ADJUSTING SYSTEM - A two-wired LED light adjusting system, for controlling the luminance adjustment for a LED lamp module. The light adjusting circuit includes a phase modulating circuit, a LED driving circuit and a controller. The phase modulating circuit generates a phase modulating voltage. The controller detects the phase modulating voltage of various waveforms. When the controller detects the phase modulating voltage of different waveforms, the controller controls the LED driving circuit to enable the LED lamp module to emit light of different luminance according to waveforms of the phase modulating voltage.06-23-2011
20110148325POWER SUPPLY FOR LAMPS, PARTICULARLY FOR LED-MR16 LAMPS - There is described a power supply for lamps, particularly for LED-MR16 lamps; the power supply receives an alternating voltage, particularly provided by an electronic transformer, at the input between first and second input terminals. The input alternating voltage has a high frequency component and the power supply comprises rectifier means of said input alternating voltage and at least one capacitor connected to the output of said rectifier means; the voltage at the ends of said capacitor is adapted to supply the lamp. The power supply includes a capacitive circuit arranged between the first and second terminals and adapted to be charged by the negative half-wave of the high frequency component of the input alternating voltage; the capacitive circuit adapted to discharge to the capacitor in the presence of the positive half-wave of the high frequency component of the input alternating voltage.06-23-2011
20100026213INTEGRATED CIRCUIT CAPABLE OF SYNCHRONIZATION SIGNAL DETECTION - A method according to one embodiment may include providing power to at least one light source. The method of this embodiment may also include detecting the frequency of at least one vertical synchronization signal, among a plurality of different synchronization signals, and controlling the power to at least one light source based on, at least in part, the detected frequency of at least one vertical synchronization signal. Of course, many alternatives, variations, and modifications are possible without departing from this embodiment.02-04-2010
20100026212ELECTRONIC BALLAST FOR A LAMP - An electronic ballast for a lamp has at least one dimming value control input and a control unit configured to set the dimming value of the lamp, wherein arranged downstream of the dimming value control input are: a signal output state detecting unit configured to acquire at least one of a signal output state in which the signal level of a signal fed to the dimming value control input overshoots a predetermined limit value, and a signal output state in which it undershoots a predetermined limit value, and a measuring unit configured to measure the duration of a signal output state, the control unit configured to set a dimming value of the lamp being configured to set the dimming value on the basis of the measured duration of the signal output state.02-04-2010
20100026211Circuit Arrangement for Operation of Discharge Lamps, and Method for Operation of Discharge Lamps - A circuit arrangement for operating a discharge lamp, wherein the circuit arrangement comprises a commutation device, which has an input which is coupled to a DC source, and has an output which can be coupled to a discharge lamp. The commutation device is designed in such a way that it couples the DC source to the output, and the polarity at which the DC source is coupled to the output can be commutated by a control device. The control device has a sync input, and the polarity of the DC source is commutated in synchronism with sync pulses of a sync signal which can be applied at the sync input. The control device has a measuring input, which is coupled to a measuring device which is designed to provide a measured value which is a measure of the size of electrode peaks. The control device suppresses at least one commutation if the measured value overshoots or undershoots a predetermined threshold value.02-04-2010
20100019698AUTOMATIC ADAPTION OF SHED LIGHTING - The invention relates to a method, a control system and a shed wherein the lighting is adjusted depending on the presence of an animal in a specific section of a shed. The shed is divided into a number of sections, for example a separation section. When no cows have access to the separation section and the section is therefore empty, the control system ensures that the lighting in the respective section is switched off. As the control system according to the invention controls both access to the section and lighting thereof, it is possible to dispense with movement sensors for controlling lighting in the respective sections.01-28-2010
20100060200ELECTRONIC BALLAST HAVING A SYMMETRIC TOPOLOGY - An electronic ballast for driving a gas discharge lamp having first and second electrodes comprises an inverter circuit and a symmetric resonant tank circuit for minimizing the RFI noise produced at the electrodes of the lamp. The inverter circuit receives a substantially DC bus voltage generates a high-frequency AC voltage. The symmetric resonant tank circuit comprises a split resonant inductor having first and second windings magnetically coupled together. The first and second windings electrically coupled between the respective electrodes of the lamp and the inverter circuit. The symmetric resonant tank further comprises first and second capacitors coupled in series electrical connection between the electrodes of the lamp with the junction of the first and second capacitors coupled to the DC bus voltage at the input of the inverter circuit.03-11-2010
20110068713METHOD AND CIRCUIT ARRANGEMENT FOR CYCLE-BY-CYCLE CONTROL OF A LED CURRENT FLOWING THROUGH A LED CIRCUIT ARRANGEMENT, AND ASSOCIATED CIRCUIT COMPOSITION AND LIGHTING SYSTEM - The invention provides a method for cycle-by-cycle control of a LED current (ILED) flowing through a LED circuit arrangement (LEDCIRC) at a mean LED current level. The method comprises a) establishing a converter current (IL), b) establishing an oscillation of the converter current (IL) between substantially a valley current level and substantially a peak current level, c) feeding the LED circuit arrangement (LEDCIRC) with the converter current (IL) as the LED current during a part of an oscillation cycle of the oscillation of the converter current, d) determining a current level correction for compensating a current level error between an integral over an oscillation cycle of the LED current and a reference, the reference being representative of the mean LED current level, and e) adjusting at least one of the valley current level and the peak current level with the current level correction for use in a successive cycle of the oscillation of the converter current. The invention also provides a circuit arrangement operable for using the method, a LED driver IC using the circuit arrangement, a circuit composition with at least one LED and the circuit arrangement, and a lighting system with the circuit composition.03-24-2011
20100019697Pulse-Width Modulation Current Control with Reduced Transient Time - One embodiment of the present invention includes a current regulator circuit. The circuit includes at least one switch configured to periodically couple and decouple a respective at least one voltage rail to an inductor to maintain a current through the inductor. The circuit also includes a pulse-width modulation (PWM) controller configured to set a duty-cycle associated with a switching signal to control the at least one switch based on a feedback signal that is associated with a magnitude of the current. The circuit also includes a switch-controlled current path configured to shunt the current from a load in response to a control signal. The circuit further includes an error circuit configured to provide an error term to the PWM controller upon activating the control signal to adjust the duty-cycle substantially instantaneously in response to the control signal.01-28-2010
20100134048HID-Lamp Control Method and Circuit - A method and circuit for controlling an HID lamp powered by an HID ballast during warm-up includes gradually increasing the lamp power as the lamp voltage increases. The method includes the steps of calculating a variable reference signal as a function of the lamp voltage and controlling the lamp operating conditions based on the variable reference signal and a feedback signal, to thereby keep the lamp current within a range around a substantially constant target value during warm-up.06-03-2010
20110031902INVERTER DEVICE - An object of the present invention is to provide an inverter device that can readily prevent flickering on a light emitting apparatus even when the light emission level thereof lowers. To achieve the object, an inverter device according to the present invention includes a rectifier (02-10-2011
20090206775Constant Lumen Output Control System - A constant lumen output control system for providing a constant lumen output throughout the life of a lamp at the mean or preset lumen level. The lumen con system (08-20-2009
20120146550LED DRIVE CIRCUIT - An LED drive circuit for driving an LED includes a reactor L06-14-2012
20110304280LIPS BACKLIGHT CONTROL ARCHITECTURE WITH LOW COST DEAD TIME TRANSFER - A driving circuitry arranged to pass a dead time over an isolation transformer, the driving circuitry constituted of: a three-state driver arranged to output a first signal, the first signal selectively at one of two complementary voltage levels and a high impedance state; a first capacitor, a first end of the first capacitor coupled to receive the first signal; and a first isolation transformer, a first end of a first winding of the first isolation transformer coupled to a second end of the first capacitor.12-15-2011
20110304279OPEN CIRCUIT VOLTAGE CLAMP FOR ELECTRONIC HID BALLAST - An electronic high intensity discharge (HID) ballast (12-15-2011
20110304278Constant Power Limiter and Illumination Device Having Same - A constant power limiter includes a control circuit and a power source circuit thereof, and the control circuit includes a voltage detection circuit configured for detecting a voltage of power source; a current detection circuit configured for detecting a load current; a zero-cross detection circuit configured for detecting a zero-cross point of AC power; a load driving circuit including a controlled silicon; and a micro control unit (MCU) configured for receiving output signals from the voltage detection circuit, the current detection circuit, and the zero-cross detection circuit, and outputting a control signal respectively to the load driving circuit to control a load power, wherein when the load power is less than or equal to a set power value, the load driving circuit has the controlled silicon fully open, when load power is no less than the set power value, the load driving circuit has the controlled silicon conduction angle decreased to stabilize the load power at the set power value.12-15-2011
20120306408ENERGY-RECYCLING BURN-IN APPARATUS FOR ELECTRONIC BALLASTS AND A METHOD OF BURNING-IN ELECTRONIC BALLASTS - An apparatus and method for burning-in an electronic ballast for a lamp. The apparatus comprises a first stage for emulating an input impedance characteristic of a lamp for the electronic ballast and a second stage connected to the first stage for providing energy feedback to a power supply. An input of the first stage connects in use to the electronic ballast to be burnt-in. An output of the second stage connects in use to the power supply to provide energy feedback to said power supply from the electronic ballast being burnt-in. The energy-recyclable burn-in apparatus can emulate the lamp characteristics from start up to the steady state, process high-frequency ballast output power and recycle the power back into the power grid. The burn-in method includes operating the apparatus for a predetermined period of time such that a voltage applied to the electronic ballast simulates a steady-state operation of a lamp for the electronic ballast.12-06-2012
20090058323Flyback LED drive circuit with constant current regulation - A flyback LED drive circuit for the plurality of LEDs is provided. An inductive device is coupled to an input voltage. A power transistor is connected to the inductive device in series to control the switching current of the inductive device. The energy is stored into the inductive device when the power transistor is turned on. The stored energy is delivered to the plurality of LEDs via a flyback diode when the power transistor is turned off. A control circuit is utilized to detect the switching current of the inductive device for generating a switching signal to provide a constant current to the plurality of LEDs.03-05-2009
20120043913Dimmer Output Emulation - A lighting system includes a dimmer output voltage emulator to cause a power converter interface circuit to generate an emulated dimmer output voltage. In at least one embodiment, the emulated dimmer output voltage corresponds to an actual dimmer output voltage but is unaffected by non-idealities in the dimmer output voltage, such as premature shut-down of a triac-based dimmer. By generating an emulated dimmer output voltage, the energy delivered to a load, such as a lamp, corresponds to a dimming level setting.02-23-2012
20120112666ELECTRICAL OUTLET ACTIVATION AND DEACTIVATION SYSTEM - An electrical outlet activation and deactivation system includes a controller coupled to a live power source comprising a switch and an RF signal receiver. A remote environmental sensor comprises a motion sensor, a photo cell, and an RF signal transmitter. The motion sensor, detecting a motion, sends a first condition signal coupling the live power source to the electrical outlet or device. The photo cell, detecting a daylight condition, prevents the sending of the first condition signal. A timer uncouples the live power source after a predetermined time has elapsed since the motion sensor last detected the motion. A regulator couples and uncouples the live power source to the electrical outlet or device independent of the sensor. The controller can include an electrical plug removably connectable to the live power source through an electrical outlet, or alternatively, can be permanently coupled to the live power source through a hardwire connection.05-10-2012
20110050133LED Lamps with Packaging as a Kit - Apparatus and methods for re-usable packaging of a lighting product include providing a container body to receive an electric lamp and a cover that can be repeatedly sealed and unsealed to the container. In an illustrative example, the lamp may be an AC LED lamp substantially located within the container body by a lamp locating feature on a bottom interior surface of the container body. In some embodiments, an interior surface of the lid may provide a projecting feature configured to positively retain the lamp in the lamp locating feature when the lid is installed on the container body. In various embodiments, the container body and the container lid may advantageously provide a protective package that may be sold as a kit, and may further provide a durable and reusable general purpose container system that may, for example, substantially reduce an environmental footprint associated with lamp packaging.03-03-2011
20110316449LOAD DRIVING CIRCUIT - A main transformer is arranged such that a load is connected to its secondary winding side. A first error amplifier generates a feedback signal that corresponds to the difference between a detection signal which indicates the electrical state of the load and a predetermined first reference voltage. A current generating resistor is arranged between a current generating transistor and a fixed voltage terminal. A second error amplifier is arranged such that the first input terminal receives the electric potential at a node that connects the current generating transistor and the current generating resistor, a predetermined second reference voltage is input to the second input terminal thereof, and the output terminal thereof is connected to the control terminal of the current generating transistor. An adjustment resistor is arranged between the output terminal of the first error amplifier and a node that connects the current generating transistor and the current generating resistor.12-29-2011
20120001571BACKLIGHT MODULE DETECTING ABNORMAL LAMP TUBES AND AN LCD THEREOF - A backlight module detecting abnormal lamp tubes and an LCD employing such a backlight module are proposed. The LCD includes a voltage calculator for detecting voltage applied on ends of a lamp tube to monitor the lamp tube. Once the lamp tube becomes abnormal, the voltage varies accordingly. The voltage calculator calculates a voltage signal from a plurality of lamp tubes and produces a voltage value. A protection circuit regards the voltage value as a feedback signal to decide if there are any abnormalities. Once any of the lamp tubes is abnormal, the protection circuit transmits the voltage signal to a pulse-width modulated integrated circuit (PWM IC) to activate a protective function. The protection circuit of the present invention obtains the protection signal by sampling the voltage signal of the ends of the lamp tube and then gets the control signal by means of the calculation of the voltage calculator. Thus, voltage level retrieved from the protection signal are less easily affected by dimming and temperature.01-05-2012
20100194310CONTROL CIRCUIT FOR INVERTER - A reference voltage source generates a reference voltage for adjusting an electric current for a dimming operation. The first current source generates a first current. A first current mirror circuit includes multiple output terminals, duplicates the first current, and outputs multiple first duplicated currents via the multiple output terminals. Multiple first switches are provided on paths for the respective multiple first duplicated currents. A converting resistor, with one terminal set to a fixed electric potential, is provided on a path for the multiple first duplicated currents output from the first current mirror circuit. A decoder circuit receives a control signal from an external circuit, and controls the ON/OFF operations of the multiple first switches. The reference voltage source outputs, as the reference voltage, a voltage that corresponds to a voltage drop that occurs at a converting resistor.08-05-2010
20090160368Phase Control for Hysteretic Controller - A driver circuit, and light emitting system and method are provided. The driver circuit includes possibly a controller and a phase detector coupled to produce an intermittent output proportional to a value of an input relative to upper and lower threshold values, and a difference between the input signal, which is the intermittent output signal, and a reference value. The light emitting system can include a switch and at least one light emitting device coupled to the switch. The driver circuit can be coupled to forward the intermittent output signal to the switch that is active in proportion to current level through the light emitting device, rising and falling between the modifiable upper and lower threshold values.06-25-2009
20120013270LIGHT-EMITTING DEVICE AND METHOD - A light-emitting method is provided. The light-emitting method is applied in a light-emitting device. The light-emitting device includes an emitting member to emit light. The light-emitting method includes detecting an air pressure of the light-emitting device and controlling the emitting member to emit light with color and luminance value according to the detected air pressure. A related light-emitting device is also provided.01-19-2012
20120013269POWER SUPPLY APPARATUS FOR AN LED LAMP - The present invention provides a power supply apparatus for an LED lamp, which mainly uses an isolation transformer to convert a high voltage AC input signal into a low voltage AC signal and thus generate a driving voltage for driving an LED lamp, comprising: a waveform and frequency modulation module disposed on the primary side of the isolation transformer for modulating an input waveform and a frequency f; and a secondary rectifier filter module disposed on the secondary side of the isolation transformer for converting the low voltage AC signal after passing through the isolation transformer into the driving voltage. In this way, the power supply apparatus for an LED lamp utilizes the principle of persistence of vision of human eyes to modulate the waveforms and frequencies of voltages for driving LEDs and can still maintain the normal operation.01-19-2012
20130154515SYSTEMS AND METHODS OF APPLYING BLEED CIRCUITS IN LED LAMPS - A bleed circuit is applied to a transformer based on a bleed-on time and a bleed-off time determined by monitoring an output voltage waveform of the transformer.06-20-2013
20130154516SYSTEM AND METHOD FOR COLOR CREATION AND MATCHING - Systems and methods for controlling an output of a luminaire. The luminaire uses stored spectral information for light sources within the luminaire to determine a coordinate for each light source within a color space. A desired output color is also converted to a coordinate within the color space. The distance between the desired output color coordinate and each of the coordinates corresponding to the light sources is calculated to select initial control values for the light sources. The initial control values for each light source are individually modified by a step size value, the total output of the luminaire is calculated and converted to a coordinate within the color space, and the distance between the total luminaire output coordinate and the desired color coordinate is calculated. The control values for the light sources are iteratively modified until the luminaire output coordinate is within a threshold value of the desired color output.06-20-2013
20130154517Layered Dimmer system - A layered dimmer formed of different layers. The front layer may be a scattering layer, and the back layer may be a reflective layer. The light beam is scattered prior to reflecting, to avoid reflection back to form hotspots.06-20-2013
20120025736INTEGRATED CIRCUIT SWITCHING POWER SUPPLY CONTROLLER WITH SELECTABLE BUCK MODE OPERATION - An integrated circuit (IC) controller for a switching power supply has a selectable operating mode for supporting multiple switching power supply topologies. The IC controls current by controlling a cycle rate of the switching power supply to provide a constant or variable output current, which may be provided to lighting devices such as light-emitting diodes (LEDs). The selectable operating mode includes at least a buck converter operating mode and another operating mode, which may be a flyback converter operating mode.02-02-2012
20120025737CURRENT MIRROR CIRCUIT - A current mirror circuit duplicates an input current that flows through an input terminal, and outputs an output current via an output terminal. A first transistor, a second transistor, and a diode are sequentially arranged in series between a power supply terminal to which a fixed voltage is applied and an input terminal. A third transistor and a fourth transistor are sequentially arranged in series between the power supply terminal and the output terminal. The gate of the first transistor and the gate of the third transistor are connected to the drain of the second transistor. The gate of the second transistor and the gate of the fourth transistor are connected to the input terminal.02-02-2012
20120062149LIGHT EMITTING DIODE DRIVING INTEGRATED CIRCUIT - A driving integrated circuit of light emitting diodes is used for driving at least one light emitting diode. The driving integrated circuit includes a current setting pin, a regulator circuit, and an adjuster. The driving integrated circuit sets a target current for a current flowing through the at least one light emitting diode according to an outflowing current of the current setting pin. The adjuster adjusts a target voltage according to the outflowing current. Then the regulator circuit provides a supply voltage for driving the light emitting diode so as to regulate a terminal voltage of the light emitting diode to the target voltage.03-15-2012
20090218961POWER SENSING IN A FLASHLIGHT - A flashlight includes a battery and a circuit for operation to signal to a user that the battery voltage is at selected voltage or power level. There can be two switches each being for operating a light emitting source of the flashlight. The switches are linked 3-way switches and have momentary-on functionality. An enlarged head is located above the barrel and there is the intermediate portion between the head and the barrel. The intermediate portion receives part of the first switch. The second switch is located in part of the tail cap of the flashlight.09-03-2009
20120153868LIGHT TIMEOUT OPTIMIZATION - A lighting controller may optimize a timeout value of a lamp based on the goals of saving energy and providing occupant comfort. The lamp may illuminate a lighting area. The lighting controller may determine a false-negative rate for the lamp from sensor data that represents a frequency at which the lamp is timed out while the lighting area is occupied. The lighting controller may adjust the timeout value of the lamp over time so that the false-negative rate approaches a threshold false-negative rate. The false-negatives and occupancy periods may be detected from spikes in time distributions of motion data. The amount of energy that the lamp would consume at an increased timeout value of the lamp may be determined from motion data stored while the timeout value of the lamp is at an initial timeout value.06-21-2012
20110068710ADJUSTING DEVICE FOR REGULATING THE ILLUMINATION OF A LAMP AND THE METHOD THEREOF - The present invention comprises a rectifier-filter circuit, an active power factor correction (PFC), an oscillating circuit, a boost circuit, a tube circuit, an internal power, a sampling circuit, a micro controller unit (MCU), a detecting circuit, and a power switch to regulate the brightness of a lamp. Wherein, a parameter set in the MCU would accordingly help the MCU trigger the consecutive oscillating switching time and frequency. The sampling circuit acquires the data of the consecutive switching time and frequency and sends the MCU the data to determine whether to correspondingly send a control signal for starting the oscillating circuit and starting the frequency, pulse width, number of channels of the oscillating circuit. Therefore, the present invention is accomplished through the control signal of the MCU passing through the oscillating circuit and the tube circuit, conducing to a convenient adjustment, an energy saving competence, and the long-lived lamp and switch.03-24-2011
20120153869Dimmable Power Supply - Various embodiments of a dimmable power supply are disclosed herein. For example, some embodiments provide a dimmable power supply including an output driver, a variable pulse generator and a load current detector. The output driver has a power input, a control input and a load path. The variable pulse generator includes a control input and a pulse output, with the pulse output connected to the output driver control input. The variable pulse generator is adapted to vary a pulse width at the pulse output based on a signal at the control input. The load current detector has an input connected to the output driver load path and an output connected to the variable pulse generator control input. The load current detector has a time constant adapted to substantially filter out a change in a load current at a frequency of pulses at the variable pulse generator pulse output.06-21-2012
20090134816Self adjusting power supply apparatus and method - Apparatus and methods are disclosed that control power supplies to automatically provide the appropriate voltage to drive constant current devices. A lighting system according to the present invention comprises a lighting module having a constant current device that provides a constant current in response to constant current voltage. A power supply is included that generates a power supply voltage coupled to the lighting module. A feedback circuit is included from the lighting module to the power supply causing the power supply voltage to be sufficient to provide a constant current voltage at the LED module. A method according to the present invention for generating a constant current voltage to drive a constant current device, comprises providing a drive voltage to a constant current device. The current at the constant current device is sensed a first time, and the drive voltage is increased. The current to the constant current device is sensed a second time. The drive current is held at its increased level if the current did not increase from the first to the second sensing. The increasing of the drive voltage and sensing of the current is repeated of the current did increase between the first and second sensing.05-28-2009
20090134817Method and Apparatus for Controlling Current Supplied to Electronic Devices - The present invention provides a drive and control apparatus provides a desired switched current to a load including a string of one or more electronic devices. A voltage conversion means, based on an input control signal converts the magnitude of the voltage from the power supply to another magnitude that is desired at the high side of the load. A dimming control means provides control for activation and deactivation of the load and may further provide a means for current limiting. A feedback means is coupled to the voltage conversion means and a current sensing means and provides a control signal to the voltage conversion means that is indicative of voltage drop across the current sensing means which represents the current flowing through the load. Based on the control signal received, the voltage conversion means can subsequently adjust its output voltage such that a constant switched current is provided to the load.05-28-2009
20110089867HIGH EFFICIENCY LOW POWER CAPACITOR CHARGED DC DRIVER - A high efficiency low power DC driver apparatus is presented for powering a light source, with a capacitive divider circuit receiving an AC input and providing a divided AC output, a rectifier provide a DC output below ten watts, output terminals coupleable to one or more light sources, and a linear regulator coupled in series with the light source to regulate a drive current flowing through the series circuit.04-21-2011
20120313550APPARATUS AND METHOD FOR DRIVING COLD CATHODE FLUORESCENT LAMP BY DETECTING DRIVING CHARACTERISTIC OF COLD CATHODE FLUORESCENT LAMP - A driving apparatus for a cold cathode fluorescent lamp (CCFL), including a driving circuit, a detecting element and a control circuit. The driving circuit is for driving the CCFL. The detecting element is for detecting a driving characteristic of the CCFL as a detection output. The control circuit is coupled to the detecting circuit and the driving, and used for controlling the driving circuit according to the detection output.12-13-2012
20120119677Power Supply Arrangement and Method for the Power Supply of an Electrical Load - A power supply arrangement (05-17-2012
20100289431Dimming Control Method for Display - The present disclosure provides a dimming control method for a display having a light-emitting device which includes: a first light-emitting body including an active layer generating a first light by recombination of electrons and holes; and a second light-emitting body excited by the first light and emitting a second light having a longer wavelength than the first light, the dimming control method including: controlling the power which will be supplied to the light-emitting device according to a dimming request; and adjusting the brightness of the display according to the controlled power using the second light-emitting body containing a first fluorescent material having a characteristic that chromaticity coordinates are shifted in a first direction according to the power control and a second fluorescent material having a characteristic that chromaticity coordinates are shifted in a second direction opposite to the first direction according to the power control.11-18-2010
20100289429METHODS OF AND DRIVING UNITS FOR DRIVING A GAS DISCHARGE LAMP - Methods of driving a gas discharge lamp (11-18-2010
20100289430Universal Lighting Source Controller with Integral Power Metering - A universal lighting source controller including integral power metering for use with substantially all light source types including fluorescent, incandescent, magnetic low voltage, electronic low voltage, light emitting diode (“LED”), high density discharge (“HID”), neon, and cold cathode. The lighting source controller includes a line voltage dimming circuit that can control the intensity of light sources in a lighting circuit and measures the actual amount of power consumed by the light sources. The line voltage dimming circuit includes a triac circuit for controlling this intensity and current and voltage detection circuits for measuring the power consumption. The lighting source controller can also include low voltage dimming circuits to provide a control signal to light sources having electronic or magnetic dimming ballasts to set the intensity of these light sources.11-18-2010
20100244742VARIABLE COLOR DISCHARGE LAMP - A variable color discharge lamp including a first lamp tube, a second lamp tube and a variable voltage system is provided. The first lamp tube having a first diameter has a first fluorescent powder disposed therein. The second lamp tube connected to the first lamp tube has a second diameter not equal to the first diameter. The second lamp tube has a second fluorescent powder disposed therein, wherein the second color temperature of the second fluorescent powder is not equal to the first color temperature of the first fluorescent powder. The variable voltage system provides and adjusts a common voltage of the first lamp tube and the second lamp tube. When the common voltage is adjusted, respective luminescence efficiencies of the first fluorescent powder and the second fluorescent powder vary with the common voltage, so as to adjust the mixed light color of the first and the second lamp tubes.09-30-2010
20100244741DISCHARGE LAMP LIGHTING DEVICE AND LIGHTING FIXTURE - One output power characteristic curve for supplying constant power is provided with respect to a raging voltage range of a discharge lamp, and in addition, a plurality of output power characteristic curves W09-30-2010
20120126720THREE-DIMENSIONAL IMAGE DISPLAY DEVICE - A three-dimensional image display device includes a luminance controller receiving a three-dimensional enable signal, a backlight data signal and at least one starting signal of a scan starting signal, a vertical blank starting signal and a backlight starting signal. The luminance controller outputs a backlight control signal and a backlight unit is operated based on the backlight control signal and is coupled to the luminance controller. The backlight data signal is based on a previous pulse of the starting signal and is applied from a first time when a current pulse of the starting signal starts to a second time when a next pulse of the starting signal starts.05-24-2012
20120161668LED Driving Circuit - An LED driving circuit is provided in the present invention. The driving circuit includes a load; a control module providing a control signal for regulating a current flowing through the load; a first NMOS; and a first resistor coupled with the control module in parallel so as to generate a clamp voltage providing to the control module.06-28-2012
20120126719LED DRIVER CIRCUIT AND METHOD - An LED driver circuit and a method for driving the LED driver circuit. In accordance with an embodiment the LED driver circuit includes a voltage follower circuit and a calibration circuit coupled to the voltage follower circuit. First and second currents may be injected into the node and a current is sunk from the node. In accordance with another embodiment, the LED driver circuit asserts a non-zero voltage across the light emitting diode in a first phase of a drive cycle and asserts a fixed non-zero current in the light emitting diode in a second phase of the drive cycle.05-24-2012
20110181206EMERGENCY POWER SUPPLY CIRCUIT FOR DIMMABLE ELECTRONIC BALLASTS AND RELATED METHOD - An emergency supply circuit for an electronic ballast may include: an output line to feed a supply input of the ballast; a first line to receive a mains supply signal; a second line to receive an emergency supply signal from a battery, with a converter interposed in said second line to boost said supply signal, a switch to alternatively connect said output line to said first or said second line; a controller sensitive to the absence of said mains supply signal and to the charge level of said battery, said controller to produce switching of said switch to connect said output line to said second line in the absence of said mains supply signal on said first line, whereby said output line receives said supply signal, and dimming interface circuitry to drive said dimming control input of said ballast when said output line is connected to said second feed line.07-28-2011
20110181205HALF-BRIDGE POWER CONVERTER FOR DRIVING LED BY SERIES-RESONANT CONNECTION OF INDUCTOR, INDUCTOR AND CAPACITOR - Disclosed herein is an LLC half-bridge power converter for driving an LED, which uses a CMOS timer IC having 50% duty cycle and a usable frequency range of 50 KHz through 1 MHz as a controller. In the LLC half-bridge power converter for driving an LED, the output of a rectifier is detected to operate an opto-coupler according to a soft-start set value and the opto-coupler is controlled to be turned off when the output of the rectifier exceeds a set rated voltage. The capacitance of a frequency varying condenser of the controller is varied by the opto-coupler to change the frequency of the controller so as to rapidly stabilize the output level and maintain a desired output level.07-28-2011
20120133302High pressure discharge lamp lighting device - A high-pressure discharge lamp lighting device is used for projector devices that allow controlling the mean electric power at a desired value with a slow processing speed. A color wheel rotates and disperses the beam from lamp into each of the color components, such that the electric power supplied to the lamp is controlled at different levels for each segment of the color wheel and the power feeding device control part finds the mean electric power by sampling the electric power supplied.05-31-2012
20120169255CONTROL DEVICE FOR A DISCHARGE LAMP - A control device of a driving circuit of a discharge lamp is described. The driving circuit comprises an half bridge with a high side and a low side switches and the control device comprises a first device configured to control the switching frequency of the half bridge and a second device configured to detect the saturation current condition of the choke or the over current condition by detecting, cycle by cycle, a signal representative of the current passing through the low side switch. The second device generate a signal to cause the turning off of the low side switch and the turning on of the high side switch when the saturation current or over current condition of the choke is detected.07-05-2012
20120313549Filament Detection Circuit - Provided is a circuit for detecting a filament of a fluorescent lamp, wherein a first end of a first filament is connected to a second end of the first filament via an oscillation circuit, and the first end of the first filament is connected to an output of an inverter; a first end of a second filament is connected to a second end of the second filament via an oscillation circuit, wherein the first end of the second filament is connected to an internal ground; the second end of the second filament is connected to a power source, and a voltage at the second end of the second filament is used for controlling ON and OFF of an MOSFET, wherein a source of the MOSFET is connected to the internal ground.12-13-2012
20120074870Displaying Method and Portable Electronic Device Using the Same - A displaying method used in a portable electronic device is provided. The portable electronic device includes a display panel having a backlight module. The displaying method includes the following steps: turning off the backlight module when a rotation event occurs; waiting for a time period; turning on the backlight module.03-29-2012
20120249015Intelligent Electrical Systems for Powering Electrical Circuits - An electrical system for powering electrical circuits has a current varying device electrically coupled to a power consuming device and an exhaustible power source connector. A first microprocessor receives power through the exhaustible power source connector and communicates with a first signal modulator and demodulator. An inductor is responsive to the current varying device from which power is drawn. A second microprocessor receives power from the inductor and communicates with a second signal modulator and demodulator. The second signal modulator and demodulator receive power from the inductor.10-04-2012
20120181952DRIVE CIRCUIT FOR LIGHT-EMMITING DIODE ARRAY - The invention relates to a drive circuit for driving an LED array. In order to allow driving the LED array based on an AC current supplied by an electronic ballast circuit for driving a fluorescent lighting device, the invention provides for a power supply sub-circuit converting the supplied AC current to a DC current and at least partially storing energy of the converted DC current for driving the LED array. Further, the power supply sub-circuit is connected/disconnected to/from at least one of first or second terminals in response to the presence/absence of the AC current supplied via a terminal of at least one of the first or second terminals. Accordingly, the power supply sub-circuit is connected to the first and second terminals only when the supplied AC current is simultaneously supplied via a terminal of each of the first and second pair of terminals.07-19-2012
20120313548AC-DC DUAL-USE LED DRIVING CIRCUIT - An Alternating-current-Direct-current (AC-DC dual-use) Light Emitting Diode (LED) driving circuit includes an input power circuit, a buck-boost converter, and a Pulse Width Modulation (PWM) signal controller. The buck-boost converter, including a switching transistor and a feedback resistor, receives a current signal output from the input power circuit, and drives an LED with a driving signal. The PWM signal controller outputs a PWM signal according to the driving signal, so as to sequentially turn on and turn off the switching transistor. One end of the feedback resistor is coupled to the LED, and a floating ground terminal of the PWM signal controller is coupled to the switching transistor and the other end of the feedback resistor. Therefore, the AC-DC dual-use LED driving circuit is capable of dynamically adjusting the duty ratio of the PWM signal without connecting an external photocoupler.12-13-2012
20120187870LIGHTING DEVICE AND LUMINAIRE - According to one embodiment, a lighting device includes a lighting circuit and a control circuit. The lighting circuit includes an output end to which an illumination lamp is connected, and lights the illumination lamp by a direct-current power. The control circuit controls the lighting circuit so that power consumption caused by a contact resistance at a connection part between the illumination lamp and the output end of the lighting circuit during whole light lighting of the illumination lamp does not exceed a specified value set to 8 W or less.07-26-2012
20090021188LAMP DRIVING DEVICE - In one aspect, an impedance component which exhibits a high impedance in a high frequency region is arranged on a high pressure line formed on a secondary side of a transformer. The potential difference generated at both ends of the impedance component is used to detect an abnormal electrical discharge generated in the high pressure line. When the abnormal electrical discharge is detected, a switching operation is stopped by a controlling circuit whereby a protection operation is performed.01-22-2009
20120256561DC-DC CONVERTER AND DRIVING DEVICE OF LIGHT SOURCE FOR DISPLAY DEVICE USING THE SAME - A DC-DC converter includes a plurality of boost circuits and a controller. The boost circuits are coupled to another in parallel. The boost circuits receive a DC voltage and boost the DC voltage. The controller drives the boost circuits with a duty ratio of less than 50% and different phases.10-11-2012
20120229050CONVERTING CONTROLLER - A converting controller is provided and comprises a first comparing unit, a second comparing unit, a duty cycle operating unit and a reference voltage supplying unit. The first comparing unit receives a detecting signal representing a state of the load and a first reference signal, and generates a first comparing signal accordingly. The duty cycle operating unit controls power conversion of the converting circuit according to the first comparing signal. The second comparing unit receives the detecting signal and a second reference signal, and generates a second comparing signal accordingly. The reference voltage supplying unit supplies the first reference signal and adjusts a level of the first reference signal in response to the second comparing signal.09-13-2012
20120229049Lighting Control With Automatic and Bypass Modes - Methods, systems and apparatuses for controlling a light through an automatic mode and a bypass mode are disclosed. One method includes receiving physical signaling. Detection of a predetermined sequence of the physical signaling is used to determine whether to control the light in the automatic mode or the bypass mode. The automatic mode provides network control of the light, and the bypass mode bypasses the network control of the light. One lighting system includes a light, a sensor for receiving and sensing the physical signaling, and a controller detecting a predetermined sequence of the physical signaling. Detection of a predetermined sequence of the physical signaling is used to determine whether to control the light in the automatic mode or the bypass mode. The automatic mode provides network control of the light, and the bypass mode bypasses the network control of the light.09-13-2012
20120299512DIMMING SIGNAL GENERATION DEVICE AND ILLUMINATION CONTROL SYSTEM USING SAME - A dimming signal generation device outputs a square wave voltage signal having an on-duty corresponding to a dimming level to a dimming signal line from a time point when a predetermined time period has elapsed after power-up. In the dimming signal generation device, a specific voltage is outputted to the dimming signal line for the predetermined time period after the power-up.11-29-2012
20110121759METHOD AND GAS DISCHARGE LAMP WITH FILTER TO CONTROL CHROMATICITY DRIFT DURING DIMMING - Techniques are disclosed that allow for the use of metal halide lamps in dimming applications, as well as other discharge lamps susceptible to dimming-induced chromaticity drift. Examination of such lamps reveals that some of the spectral changes that cause chromaticity drift during dimming are localized in narrow band regions of the spectrum, and lamp emission in these regions is enhanced (either increased or decreased) relative to the rest of the spectrum. Selective filtering of the enhanced emission caused by dimming can be used to reduce chromaticity shift. For instance, a filter deposited on and/or integrated into a lamp component (such as the arc tube, shroud, and/or outer jacket) operates to block transmission of those regions of the spectrum.05-26-2011
20100327774Housing Illumination for Portable Electronic Devices - Systems, devices and methods for electronically marking a housing of a portable electronic device are disclosed. When the housing of the portable electronic device is electronically marked, the marking(s) are non-permanent and able to be rapidly and dynamically changed. The marked housing can provide notification or guidance to a user. The housing can also be electronically marked in a manner that facilitates low power operation of the portable electronic device. The portable electronic device can, for example, be a mobile phone (e.g., cell phone), a personal digital assistant (PDA), a computer peripheral (e.g., mouse), a portable media player, and the like.12-30-2010
20100327776HIGH PRESSURE DISCHARGE LAMP LIGHTING DEVICE AND LIGHTING FIXTURE USING THE SAME - A high pressure discharge lamp lighting device in this invention comprises a converter, an inverter, an igniter, a controller, and a pulse voltage detection circuit. The converter outputs the direct current voltage. The inverter converts the direct current voltage into the lighting voltage which is alternating current voltage, and applies the lighting voltage to the high pressure discharge lamp through an output terminal. The igniter is configured to output the pulse voltage superimposed on the lighting voltage, whereby the starting voltage is applied to the high pressure discharge lamp. The controller is configured to control the igniter to allow the igniter to superimpose the pulse voltage on the lighting voltage. The pulse voltage detection circuit detects the starting voltage to output the detection signal. The starting voltage regulation circuit regulates the starting voltage to the desired voltage value of the voltage on the basis of the detection signal.12-30-2010
20100327773METHOD AND SYSTEM FOR DIMMING AN OFFLINE LED DRIVER - An apparatus and method for dimming a light emitting diode (LED) driver. The apparatus includes a triode alternating current (TRIAC) dimmer and an LED driver receiving an input voltage from an output of the TRIAC dimmer so that the state of the LED driver is controlled by the TRIAC dimmer. The LED driver includes an active damping circuit configured for damping, upon detecting a rising edge of a bridge rectified input voltage, resonance caused by the TRIAC dimmer and the LED driver for a fixed period of time.12-30-2010
20080297069Method and Circuit for Driving a Low Voltage Light Emitting Diode - In a method for producing a control signal for regulating a drive current for driving an LED, a current through the LED is sensed, wherein the LED is driven by a power converter output, and wherein an output voltage of the power converter is proportionately controlled by a control signal. Next, a power supply voltage is sensed. The control signal is produced for the power converter, wherein the control signal is proportional to a difference between a reference voltage and the current through the LED. The control signal is then offset in response to the power supply voltage to reduce the current through the LED as the power supply voltage drops.12-04-2008
20120262092SOUND-ACTUATED ILLUMINATION CIRCUIT - A circuit (10-18-2012
20120262091Portable Lighting Devices - A flashlight having a locking mechanism for securing a head skirt to a head assembly is disclosed. A circuit for temporarily remember the mode of operation of the flashlight is also disclosed.10-18-2012
20120319621TRIAC DIMMING SYSTEMS FOR SOLID-STATE LOADS - A system includes a transformer. The transformer includes a first coil and a second coil. The first coil is configured to receive a first voltage based on an output of a switching circuit. The second coil is configured to generate a first current based on the first voltage to power a solid-state load. The system also includes a third coil. The third coil is configured to generate a second voltage based on the first voltage.12-20-2012
20110037418LED DEVICE - An LED device is provided. The LED device implements an efficient dimming operation. The LED device includes a triac dimmer for receiving an AC voltage and adjusting an angle of the AC voltage, a ballast for receiving the AC voltage from the triac dimmer and generating an AC voltage pulse, a bridge diode unit for generating a DC voltage pulse using the AC voltage pulse, an LED for receiving a DC current and emitting a light, an LED drive controller for receiving a dimming signal and controlling the DC current passing through the LED, and a dimming signal generator for receiving the AC voltage pulse from the ballast and generating a pulsating dimming signal for compensating an output of the triac dimmer and providing the dimming signal to the LED drive controller.02-17-2011
20110037417Zero power lighting control device and method - The present invention is directed to a lighting control system with a motion sensor unit that electrically couples to a load circuit through a latching relay or load controller for turning on and off lights. The motion sensor unit is configured to power down to draw zero power after a time delay, when motion is longer detected within the work space by the motion sensor unit. The lighting control system further includes a control circuit that reinitiates or turns the motion sensor back on through a switch device.02-17-2011
20110037416POWER CONVERSION APPARATUS, DISCHARGE LAMP BALLAST AND HEADLIGHT BALLAST - Power conversion apparatus includes a converter circuit, a control circuit, a simulation circuit and a sense circuit. The converter circuit includes a magnetic device for power conversion and a switching device, and is configured to convert power from a power supply into direct current power. The control circuit is configured to supply the converter circuit with a high frequency signal for turning the switching device on and off. The simulation circuit is configured to produce a simulation signal that simulates state or change of magnetic flux of the magnetic device. The sense circuit is configured to produce a signal which corresponds to at least one of the input and output of the converter circuit and is superposed on the simulation signal to form a superposed signal. The control circuit defines an on-period of the high frequency signal based on the superposed signal.02-17-2011
20100181935UNIVERSAL DIMMING METHOD AND SYSTEM - A universal line voltage dimming method and system, with a control circuit for an electronic ballast operable to receive ballast input power and an outboard dedicated dimming signal including a power sensing circuit (07-22-2010
20120268036POWER SUPPLY FOR AIRFIELD LIGHTING - Disclosed herein is a power supply suitable for use with an airfield lighting device. In accordance with an example embodiment, there is disclosed herein, a rectifier that converts a signal from an alternating current (AC) current source to a direct current (DC) voltage. The circuit comprises a current sensor, a controller, and a half active bridge rectifier. The controller receives a signal from the current sensor and controls the operation of the half active bridge rectifier to produce a light emitting diode (LED) current based on the current sensed by the current sensor.10-25-2012
20120268035Push button switch - A push button switch for use in logic-level switching applications. It has dual-intensity LED backlighting of a display: the switch off-state is low intensity and the on-state is distinctly brighter. The button assembly, not attached to the main body, uses magnets to provide a tactile touch and a retaining force. The backlight power is inductively coupled to the button assembly by a high-frequency oscillator that also limits and controls the LED backlight current. Switching is by a Hall-effect switch; alternate action is by bistable logic; and diode logic provides single-wire switch output and remote-control input. The wire can also carry remotely generated pulse signals to program an alternative active display. There are no mechanisms or wear parts in the assemblies, allowing impregnation sealing.10-25-2012
20120268038Layered Dimmer system - A layered dimmer formed of different layers. The front layer may be a scattering layer, and the back layer may be a reflective layer. The light beam is scattered prior to reflecting, to avoid reflection back to form hotspots.10-25-2012
20120268037LIGHTING APPARATUS - A lighting apparatus includes a power unit supplied with power; an emission unit to be lit with power supplied from the power unit, with a light quantity of the emission unit being controlled in accordance with a control signal; and a power control part lighting the emission unit after the control signal is supplied. Since the emission unit may be lit after the control signal is supplied, the emission unit may be lit with a light quantity in accordance with the control signal from an initial stage, and hence a user may be prevented from feeling uncomfortable.10-25-2012
20120319622Systems And Methods For Conveying Information Using A Control Signal Referenced To Alternating Current (AC) Power - Systems and methods convey information from a controller to at least one slave unit using a single wire referenced to an alternating current (AC) power supply. A control signal has a high voltage and a low voltage. The high voltage is greater than a voltage midpoint of the AC power supply and the low voltage is less than the voltage midpoint. The control signal is conveyed through the single wire to each of the at least one slave unit. At each slave unit, a comparison voltage, representative of the voltage midpoint, is generated by dividing substantially midway the potentials between the power lines of the AC power supply and the control signal is compared to the comparison voltage to determine low and high states of the control signal; the low and high states represent the information.12-20-2012
20120081039METHOD AND APPARATUS FOR A LED DRIVER WITH HIGH POWER FACTOR - A control circuit of a LED driver according to the present invention comprises an output circuit, an input circuit and an input-voltage detection circuit. The output circuit generates a switching signal to produce an output current for driving at least one LED in response to a feedback signal. The switching signal is coupled to switch a transformer. The input circuit samples an input signal for generating the feedback signal. The input signal is correlated to the output current of the LED driver. The input-voltage detection circuit generates an input-voltage signal in response to an input voltage of the LED driver. The input circuit will not sample the input signal when the input-voltage signal is lower than a threshold. The control circuit can eliminate the need of the input capacitor for improving the reliability of the LED driver.04-05-2012
20120081038DISPLAY PANEL DRIVING VOLTAGE SUPPLY APPARATUS AND METHOD - A display panel driving voltage supply apparatus and method is disclosed. Said supply apparatus comprises: a timing controller for providing a voltage control signal and a switch control signal; a level shifter, receiving the voltage control signal for selecting a first specified voltage to be transmitted on a first driving voltage supply line as well as selecting a second specified voltage to be transmitted on a second driving voltage supply line according to the voltage control signal; and a first switch, wherein the first and the second driving voltage supply lines are electrically connected with each other to charge share between the first and the second specified voltages when the first switch is turned on under the control of the switch control signal. Said supply apparatus is capable of solving the problem of high power consumption and thereby reducing the electricity consumption.04-05-2012
20100231141DRIVING CIRCUIT FOR LED - A driving circuit for LED includes: at least one LED; a light emission driving circuit having a first PWM unit and a power converting unit generating a driving current according to a signal generated by the first PWM unit and sending the driving current to the LED; a shunt parallel-connected with the LED; and a signal generating unit for generating a signal to switch on or off an electrical connection between the shunt and the light emission driving circuit. When the signal from the signal generating unit is at a high level, the electrical connection is switched on so that a majority of the residual driving current flows to the shunt.09-16-2010
20100231140DATA BASED AMBIENT LIGHTING CONTROL - In controlling an ambient lighting element, a category of data being rendered by a host is identified, ambient lighting data associated with the identified category is retrieved, and the retrieved ambient lighting data is rendered in correspondence with the rendered data. The retrieved ambient lighting data may be an ambient light script arranged to determine temporal portions of ambient lighting data. The ambient lighting data may be associated with the category based on user input. A sub-category of the data may be identified and the retrieved ambient lighting data may be modified with additional ambient lighting data associated with the sub-category. An association of a category with ambient lighting data may be edited by a user. A default association of a category to ambient lighting data may be provided.09-16-2010
20110266977ILLUMINATED OPTICAL APPARATUS - A device may include a magnifying lens having a focal length that defines a focal plane, a light source providing visible light directed toward the focal plane, and a controller. The controller may be programmed to receive a signal indicative of the distance from the device to an object, cause the light source to emit light at a first brightness if the distance is at least substantially equal to the focal length of the lens, and cause the light source to emit light at a second brightness, dimmer than the first brightness, if the distance is not at least substantially equal to the focal length of the lens.11-03-2011
20080265803POWER LIMITING CIRCUIT - A power limiting circuit for controlling the power of the incandescent lamp not to overrun the rated power limit includes a sampling circuit that consists of two resistors connected in parallel. A control chip compares the received sample voltage with the standard voltage then outputs control signal to drive the conduction of a SCR (silicon controlled rectifier) to change the inner states of contacts of a relay so as to further control the on/off between the input and the output. Based on this control process and technique, this invention prevents the employment of incandescent lamps having a greater power than power rating. Besides, a bi-operational amplifier circuit is used to fulfill the whole examination and control perfectly.10-30-2008
20120091915POWER LINE COMMUNICATION METHOD AND APPARATUS FOR LIGHTING CONTROL - A transmitter apparatus and a ballast/driver receiver apparatus are presented for transmitting control information through a lighting system power line connection to a ballast or driver in which the transmitter selectively interrupts power delivery in select AC line power cycles to indicate data of a first binary state an uninterrupted power cycles indicate a second binary state with the receiver decoding the message data bits of different binary states based at least partially on the interruptions.04-19-2012
20120091914FAULT TOLERANT ION SOURCE POWER SYSTEM - The presently disclosed technology provides a responsive ion beam source power supply system capable of handling fault events without relying on conventional protection circuitry (e.g., fuses and breakers) so that physical power supply hardware intervention by a user is minimized for typical fault conditions and the ion beam source power supply system may recover automatically after experiencing a fault condition. The presently disclosed technology further discloses an ion beam source power supply system capable of detecting and diagnosing fault states, autonomously implementing command decisions to preserve or protect the function of other ion source modules or sub-systems, and/or mitigating or recovering from the disruptive fault event and returning the ion beam source system to desired user settings.04-19-2012
20120326632SEMICONDUCTOR LIGHT SOURCE LIGHTING CIRCUIT - A lighting circuit for lighting a semiconductor light source includes: a DC/DC converter configured to receive a DC first voltage and a DC second voltage and generate a DC third voltage; a first connector including a first terminal, wherein the third voltage is applied to the first terminal, wherein the first connector connects the first terminal and one end of the semiconductor light source; and a control circuit that controls the DC/DC converter. The control circuit selects only the first voltage as a voltage applied to the other end of the semiconductor light source, when a voltage for emitting the semiconductor light source is less than an absolute value of a difference between the first and second voltages. The control circuit selects the first voltage or the second voltage as the voltage applied to the other end thereof, when the voltage is not less than the absolute value.12-27-2012
20100181934AUTOMATIC, LOW LEVEL FLOOR LIGHTING SYSTEM - An automatic, low level floor lighting system includes a light unit including a light operable to produce visible light when energized by a power source and a control means for allowing a user to adjust an intensity of the visible light. The light unit also includes an ambient light sensor to inhibit the light from being energized when an ambient light is above a predetermined level. The light unit further includes a receiver for receiving an activation signal to energize the light and a deactivation signal to de-energize the light. A transmitter transmits the activation and deactivation signals to an additional light unit. The system also includes a remote activation unit for transmitting the activation and deactivation signals to the receiver when the user engages the remote activation unit where the user can remotely turn the light on and off when the ambient light is below the predetermined level.07-22-2010
20100181936Driver Device for a Load and Method of Driving a Load With Such A Driver Device - The invention relates to a driver device for a load (07-22-2010
20120139449Movement-Based Feedback Device - An apparatus is provided that includes a substrate and an affixed accelerometer configured to measure acceleration of the substrate, and produce a signal representative of the measured acceleration. The apparatus also includes a light-emitting component capable of emitting multiple colors of light with variable luminosity, with the color and luminosity of light emitted by the light-emitting component defining a visual output produced by the light-emitting component. And the apparatus includes a processor coupled to the accelerometer and light-emitting component. The processor is configured to receive the signal from the accelerometer, calculate a visual output according to an algorithm as a function of the measured acceleration of the substrate, and cause the light-emitting component to produce the calculated visual output.06-07-2012
20120139448TWO-TERMINAL CURRENT CONTROLLER AND RELATED LED LIGHTING DEVICE - A two-terminal current controller having a current limiting unit and an adjusting unit regulates a first current flowing through a load according to a load voltage. When the load voltage does not exceed a first voltage, the two-terminal current controller operates in a first mode for conducting a second current associated a rectified AC voltage, thereby limiting the first current to zero and adjusting the second current accordingly. When the load voltage is between the first voltage and a second voltage, the two-terminal current controller operates in a second mode for conducting the second current, thereby limiting the first current to zero and limiting the second current to a constant value larger than zero. When the load voltage exceeds the second voltage, the two-terminal current controller operates in a third mode for turning off the current limiting unit. The adjusting unit can adjust the predetermined value and the second voltage.06-07-2012
20120139447DRIVING CIRCUIT HAVING A POWER FACTOR CORRECTION (PFC) FUNCTION - A driving circuit having a power factor correction (PFC) function includes a power converter, a harmonic wave generator, a voltage divider, and a modify element. The power converter receives AC power to convert to DC power. The harmonic wave generator generates a harmonic wave from the DC power. The voltage level of the harmonic wave is decreased by the voltage divider to generate a comparing signal. The modify element compares the comparing signal and a feedback current signal of the LED to regulate the DC power accordingly for power-supplying the LED stably. Therefore the power factor (PF) of the driving circuit is enhanced.06-07-2012
20130020966METHOD AND CIRCUIT FOR IMPROVING CREST FACTOR OF GAS DISCHARGE LAMP - A method and circuit for improving the crest factor of the gas discharge lamp. The method includes: the signal of the gas discharge lamp can be sampled to get a status signal; whether the present stage of the gas discharge lamp is at warm up stage or constant power stage can be judged based on the result of comparison between the status signal and a preset value; preset parameters can be selected based on the stage of the gas discharge lamp, the first parameter can be selected when the gas discharge lamp is at a warm up stage, and the second parameter can be selected when the gas discharge lamp is at a constant power stage; a control signal can be outputted during the lamp current commutation based on the selected first or second parameter to improve the crest factor of the gas discharge lamp.01-24-2013
20080252235Electronic Control Gear and Method of its Use - An electronic control gear for a lamp is disclosed. The electronic control gear has a memory device and a microprocessor configured to acquire data relating to at least one parameter of operation of the lamp and configured to store acquired data in the memory device. The at least one parameter of operation is an electrical power consumption of the lamp during a period of operation, a duration of operation of the lamp during a period, a duration of operation the lamp at each of a plurality of power consumption levels or bands, or an operating temperature of a component of a circuit in which the lamp is connected.10-16-2008
20080246418DRIVER SYSTEM AND METHOD WITH MULTI-FUNCTION PROTECTION FOR COLD-CATHODE FLUORESCENT LAMP AND EXTERNAL-ELECTRODE FLUORESCENT LAMP - System and method for driving a cold-cathode fluorescent lamp. The system includes a control subsystem configured to generate one or more control signals, and a power supply subsystem configured to receive the one or more control signals and a DC input voltage, convert the DC input voltage to an AC output voltage, and send the AC output voltage to a cold-cathode fluorescent lamp. If the DC input voltage is lower than a predetermined threshold, the system for driving the cold-cathode fluorescent lamp is turned off in response to the one or more control signals.10-09-2008
20130169188BIDIRECTIONAL VOLTAGE DIFFERENTIATOR CIRCUIT - A bidirectional voltage differentiator circuit comprises start-up circuitry, sensing circuitry, and output circuitry coupled to logic circuitry. The start-up circuitry acts to start-up the sensing circuitry when the circuit is powered on, and accelerates the response of the sensing circuitry thereafter. The sensing circuitry senses variation in an input voltage applied to an input node. Responsive to the voltage variation sensed by the sensing circuitry, the output circuitry produces a state change at a first or second output node. The logic circuitry receives the states of the output nodes and produces a logic output signal to indicate the occurrence of the variation sensed in the input voltage. The voltage sensing circuit is operable to sense variation of the input voltage regardless of whether the voltage is rising or falling and without regard to the DC value of the input voltage.07-04-2013
20130169189Variable Operating Mode Solar Lighting System - A solar lighting system includes a record of a plurality of lighting profiles. The particular profile that governs the operation of the lights of the system at any given time is selected by each lighting element according to its determination of the time of year or season. The invention allows the more efficient use of solar energy collected at various time of the year.07-04-2013
20130169190LIGHT EMITTING DEVICE, DISPLAY DEVICE, LIGHT EMITTING COMPONENT DRIVER CIRCUIT, AND METHOD OF DRIVING LIGHT EMITTING COMPONENT - A light emitting device includes light emitting component sets, a voltage measurement circuit, a voltage generator, and a drive controller. The voltage measurement circuit is configured to measure voltages at connecting points between light emitting component lines and drive switches. The voltage generator includes a plurality of smoothing capacitors for the light emitting component sets, respectively. The voltage generator is configured to generate a drive voltage applied to the light emitting component sets using one of the smoothing capacitors. The drive controller is configured to select the smoothing capacitor corresponding to the light emitting component set, the measured voltage of which is the lowest among the light emitting component sets on which lighting control is performed to alter the drive voltage according to alteration of the lighting control. The drive controller is configured to control the voltage generator to generate the drive voltage using the selected smoothing capacitor.07-04-2013
20080224636POWER CONTROL SYSTEM FOR CURRENT REGULATED LIGHT SOURCES - A light emitting diode (LED) lighting system includes a PFC and output voltage controller and a LED lighting power system. The controller advantageously operates from an auxiliary voltage less than a link voltage generated by the LED lighting power system. The common reference voltage allows all the components of lighting system to work together. A power factor correction switch and an LED drive current switch are coupled to the common reference node and have control node-to-common node, absolute voltage that allows the controller to control the conductivity of the switches. The LED lighting system can utilize feed forward control to concurrently modify power demand by the LED lighting power system and power demand of one or more LEDs. The LED lighting system can utilize a common current sense device to provide a common feedback signal to the controller representing current in at least two of the LEDs.09-18-2008
20090134818UNIVERSAL INPUT VOLTAGE DEVICE - A universal input voltage device is presented which may receive a wide range of regulated and unregulated input voltages, both DC and a wide range of variable frequency AC, and output a desired regulated current at a desired voltage independent of the fluctuation of input voltage and frequency. The circuit includes a preconditioning input circuit, a Buck converter circuit with over voltage protection, flyback and boost circuits, and a shutdown circuit configured to drive a predetermined electrical or electronic device.05-28-2009
20110273113Method and Device for Driving Light-Emitting Diode - A method for driving a light-emitting diode based upon an AC input voltage includes receiving and full-wave rectifying the AC input voltage to generate a full-wave rectified input voltage, generating a pulse width modulation signal according to the full-wave rectified input voltage and a luminance signal, and generating a driving voltage according to the pulse width modulation signal and the full-wave rectified input voltage, and applying the driving voltage to the light-emitting diode.11-10-2011
20120249014CIRCUIT FOR LEAKAGE-CURRENT ELIMINATION IN LED T8 FLUORESCENT TUBE - An electric-shock protection circuit that incorporates a PWM start-up control circuit for controlling the start-up of the PWM controller IC. When an electric-shock current test is conducted, the PWM start-up control circuit prevents the starting up of this PWM controller IC. This circuit is realized by resistors, capacitors and switches. In order to achieve protection, the switches perform an operation that different electric paths are activated for a supply voltage condition of around 90-149Vac and another condition of around 150-264Vac. The circuit disclosed in this invention: can be used in the electric-shock current test with a wide range of supply voltage; can ensure that the peak value of the shock current is lower than the safety threshold for human bodies; and can solve the problem encountered in carrying out the test of Standard UL935 where one end of the LED light tube is connected to the electric grid.10-04-2012
20130175949LIGHT SOURCE SYSTEM CAPABLE OF ADJUSTING COLOR TEMPERATURE - A light source system capable of adjusting color temperature includes the steps: disposing at least one first and second LED (light emitting diode) chips on an electrical isolation substrate; disposing a first driving circuit and a second driving circuit on the electrical insulation substrate to electrically connected to the first and second LED chips; using at least one fluorescent plastic body containing fluorescent powder to cover the first LED chip; using a driving unit to generate a first driving signal and a second driving signal transmitted to the first and second driving circuits so as to drive the first and second LED chips to emit light; and using at least one transparent packaging plastic body to cover the fluorescent plastic body and the second LED chip to provide protection and second order optic.07-11-2013
20130113395DEVICE DRIVER PROVIDING COMPENSATION FOR AGING - Driving circuits are provided that compensate for devices having characteristics that change with age. A correction circuit has a reference device having an output that changes with age in a known manner over a time span similar to the expected lifetime of the driven device. The output of reference device provides an indication of the current age of driven device.05-09-2013
20130093358DRIVING CIRCUIT OF LIGHT EMITTING DIODE AND GHOST PHENOMENON ELIMINATION CIRCUIT THEREOF - A driving circuit of a light emitting diode (LED) and a ghost phenomenon elimination circuit thereof are disclosed. The ghost phenomenon elimination circuit which includes a ghost phenomenon elimination unit and a counter unit may determine a black insertion period according to a gray scale clock signal, and output an enable signal to the ghost phenomenon elimination unit during the black insertion period. The ghost phenomenon elimination unit may pull up the voltage levels at current driving terminals of the driving circuit so as to prevent the ghost phenomenon from occurring.04-18-2013
20130099699POWER SUPPLY DEVICE - A power supply device containing a first board, a second board, an enclosure into which the first board and the second board are installed, a power supply unit which supplies power to an external load, a control circuit unit for controlling output current and/or output voltage from the power supply unit to the external load, the control circuit unit being embedded on the first board, a memory which stores control information, the memory being utilized in the control circuit unit for controlling the output current and/or the output voltage from the power supply unit, and an interface unit which is capable of receiving the control information from an external device and transmitting the control information to the memory, the interface unit being embedded on the second board which is physically separated from the first board.04-25-2013
20130187569INFLATABLE LAMP ASSEMBLY - The present invention discloses an inflatable lamp assembly a bladder and a light emitting apparatus that assembled together. The bladder includes a first bag portion, a second bag portion connected with an opening of the first bag portion, an air nozzle disposed on the firs bag portion, and a flange disposed at the opening of the second bag portion. The first bag portion and the second bag portion are co-formed an inflatable cell which is capable of being inflated and deflated by the air nozzle. The light emitting apparatus is received in a recess defined between the second bag portion and flange. As such, the light emitting apparatus can be firmly clamped in the recess when the inflatable cell is filled with air.07-25-2013
20110266975ILLUMINATION CONTROLLER AND ILLUMINATION DRIVING SYSTEM - An illumination controller adapted to control a converting circuit to convert an electric power of a DC input power source to drive a light source is provided. The illumination controller includes a dimming unit and a control unit. The dimming unit receives a dimming signal and correspondingly generates a dimming control signal according to the number of the dimming signal. The control unit controls the electric power provided to the light source by the converting circuit according to the dimming control signal, so as to adjust a brightness of the light source. Furthermore, an illumination driving system is also provided.11-03-2011
20130141016LIGHTING APPARATUS AND ILLUMINATING FIXTURE WITH THE SAME - A control circuit selects a first control mode in which a switching element is turned on/off so as to flow current in an inductor in a continuous mode by which the current flows in the inductor without a sleep period, thereby fully lighting a light source load. The control circuit selects one of a second control mode in which a turn-on time of the switching element is changed and a third control mode in which an oscillating frequency is changed according to an interval, to which the designated dimming ratio corresponds, to light the light source load. An output capacitor connected between output terminals of a step-down chopper circuit smoothes a pulsation component of an output current supplied to the light source load and has capacity set so that a ripple ratio of the output current is less than 0.5 at the full lighting of the light source load.06-06-2013
20130141017LIGHTING APPARATUS AND ILLUMINATING FIXTURE WITH THE SAME - A control circuit selects a first control mode in which a switching element is turned on and off so that a current flows through an inductor in a critical or discontinuous mode, thereby fully lighting a light source load. The control circuit selects one of a second control mode in which On time of the switching element is changed and a third control mode in which an oscillating frequency is changed according to an interval, to which a designated dimming ratio corresponds, to dim the light source load. An output capacitor connected between output terminals of a step-down chopper circuit smoothes pulsation component of an output current supplied to the light source load and has capacity set so that a ripple ratio of the output current is less than 0.5 at full lighting of the light source load.06-06-2013
20090121653Constant Current Circuit, Light Emitting Apparatus and Power Supply Apparatus Using That Constant Current Circuit - In a constant current circuit that supplies a constant current Ic to a circuit connected to a current output terminal, the first transistor M05-14-2009
20130147393HIGH ACCURACY, HIGH DYNAMIC RANGE LED/LASER DRIVER - A current driver circuit, for driving a light source, that provides high accuracy and reduced power consumption is disclosed. The driver includes a digital to analog converter configured to receive a digital value representing a light intensity and convert the digital value to an analog current signal. A current minor is configured to receive the analog current signal and create a current minor output which is larger than the analog current signal based on a ratio of the current mirror. This results in a modified analog current signal. A light source receives the modified analog current signal, and responsive thereto generate a light signal such that the light signal has an intensity controlled by the digital value. One or more amplifiers are also part of the current driver and configured to increase response time and accuracy.06-13-2013
20130147394METHOD OF DETECTING AND CONTROLLING PERCEPTUAL FLICKER - A method and apparatus are provided for processing light from a light source. The method includes the steps of measuring a predetermined set of characteristics of the light source and detecting flicker when the predetermined set of characteristics exceed a corresponding flicker fusion threshold value.06-13-2013
20100283412"Lip Light" Automatically Controlled by the Position of the Head - A lighting device for helmet comprises a helmet including an arm to which are fixed a microphone and a lamp, called “lip light”, lighting with at least one lighting level. The device comprises a head tracking system comprising a computer for measuring and collecting data concerning the attitude of the helmet in motion and its position in space. Lamp activation means are automatically controlled by positions calculated by the computer so that the lip light lights, with one of its lighting levels, when it is oriented in a direction contained within a predefined area.11-11-2010
20100308750CONSTANT CURRENT DRIVER CIRCUIT WITH VOLTAGE COMPENSATED CURRENT SENSE MIRROR - A current sensing circuit for sensing the current provided to LEDs by a constant current power source includes a resistive shunt in series with the load and a current mirror having a first leg connected to a first terminal of the resistive shunt and a second leg connected to a second terminal of the resistive shunt. Both legs of the current mirror are also connected to ground. The first leg provides a reference signal to the second leg, and the second leg uses the reference signal and a voltage at the second terminal of the resistive shunt to provide a ground referenced output signal indicative of the current provided to the LEDs.12-09-2010
20100308749AC Power Line Controlled Light Emitting Device Dimming Circuit and Method Thereof - The present invention discloses an AC power line controlled light emitting device dimming circuit and a method thereof. The AC power line controlled light emitting device dimming circuit includes: a light emitting device driver circuit for controlling current through a light emitting device, wherein the light emitting device is current-controlled; and a level adjustment circuit for detecting power-OFF of an AC power switch and generating a corresponding level adjustment signal which is transmitted to the light emitting device driver circuit to control the current through the light emitting device accordingly.12-09-2010
20100308748DEVICE DRIVER PROVIDING COMPENSATION FOR AGING - Driving circuits are provided that compensate for devices having characteristics that change with age. A correction circuit has a reference device having an output that changes with age in a known manner over a time span similar to the expected lifetime of the driven device. The output of reference device provides an indication of the current age of driven device.12-09-2010
20100308747PULSE WIDTH MODULATION (PWM) CLOSED LOOP LED CURRENT DRIVER IN AN EMBEDDED SYSTEM - Methods and systems for providing stable and accurate low noise DC reference voltage are described. In the described embodiments, a feedback controlled DC reference voltage supply provides a stable and well controlled sense current. The sense current is in turn used to produce a stable and well controlled light output from a light emitting diode (LED).12-09-2010
20110234123Dynamic Loading of Power Supplies - A circuit for altering a level of impedance presented to a power supply including a power supply line includes an energy dissipating circuit, a detection circuit configured to generate a control signal indicative of a power consumption level in a load circuit coupled to the power supply line, and an activation circuit configured to controllably couple the energy dissipating circuit to the power supply line in response to the control signal. Methods of operating a solid state lighting apparatus including a power supply and a solid state lighting device coupled to the power supply include detecting a level of power consumption by the solid state lighting device, and coupling an energy dissipating circuit to the power supply in response to the level of power consumption by the solid state lighting device falling below a threshold level.09-29-2011
20100315022Handheld Illuminating Torch - A handheld torch which comprises a cylindrical body that has a top and a bottom. The body is configured to be grasped by a person and is preferably made of wood. The torch includes a window portion configured to extend at least partially around the body and one or more light sources positioned within the window portion. The torch includes a power source that is coupled to the light source, where the power source located within the body. The torch includes circuitry within the body, in which the circuitry is coupled to the power source and the light source. The light source produces light which illuminates through the window portion when the light source is energized.12-16-2010
20130154514VOLTAGE-CONTROLLED LIGHT DIFFUSING MODULE, FLASH LAMP MODULE AND CONTROLLING METHOD THEREOF BASED ON FACE INFORMATION - A voltage-controlled light diffusing module, a flash lamp module and a controlling method thereof are provided. The voltage-controlled light diffusing module includes a light diffuser, a driving circuit and an information processing unit. The information processing unit receives face information for deciding a driving voltage of the driving circuit, so as to change transmission of the light diffuser.06-20-2013
20130181636Streetlight Controllers - The subject matter included in this disclosure can be embodied in an apparatus that includes a computing device having memory and a processor. The processor can be configured to establish a wireless connection with a streetlight controller that communicates with a streetlight, initiate transmission of a set of parameters related to commissioning the streetlight, and receive, from the controller, status and identification information associated with the streetlight.07-18-2013
20110298395CONTROL CIRCUIT OF LIGHT-EMITTING ELEMENT - A control circuit of a light-emitting element comprises a rectifying unit which full-wave rectifies an alternating current power supply, a clock generator which generates and outputs a clock signal (CLK), a first comparator which compares a comparison voltage (CS) corresponding to a current flowing to the light-emitting element and a reference voltage (REF), and a switching element which is set to an ON state in synchronization with the clock signal (CLK) and which is set to an OFF state when the comparison voltage (CS) becomes greater than the reference voltage (REF) at the first comparator, to switch the current flowing to the light-emitting element. In this structure, a period of the clock signal (CLK) generated in the clock generator is varied, to reduce or inhibit noise.12-08-2011
20110291592Dimmer Conduction Angle Detection Circuit and System Incorporating the Same - A conduction angle detection circuit, and systems and methods incorporating the same, is disclosed. The circuit includes a comparator having a first input and a second input, and configured to provide a pulse-width modulated output in response to comparison of signals at the first input with signals at the second input. The output has a pulse width representative of a dimmer setting of a dimmer circuit. The circuit also includes a limiting circuit coupled to the comparator and configured to receive a rectified voltage and to provide a voltage-limited output in response to the rectified voltage to the first input of the comparator. The circuit also includes a threshold supply circuit configured to provide a threshold voltage to the second input of the comparator, and a filter coupled to the comparator. The filter is configured to convert the pulse-width modulated output of the comparator to the dimmer reference level signal.12-01-2011
20110298396Light Emitting Device and Electronic Equipment Using the Same - A light emitting device is provided which is capable of displaying in desired colors stably by controlling a change in luminance of OLED when an organic light emitting layer is degraded or there is a change in temperature of the surroundings. A reference value for the amount of current flowing into a pixel portion is calculated from data of a video signal. Then, the pixel portion displays an image in accordance with the data of the video signal and the drive current at the time is measured for all of OLEDs in the pixel portion. The two voltage values supplied from a variable power supply to the pixel portion are corrected such that the measured drive current approaches the reference value. With the above structure, lowering of luminance which accompanies degradation of an organic light emitting layer is prevented and a clear image can be displayed as a result.12-08-2011
20110309771PROPORTIONAL REMOTE CONTROL - Disclosed is a proportional controller that utilizes a deflected metal cantilever that provides a progressive change in capacitance for a given deflection that is used to generate a proportional control signal. In addition, a efficient step-up converter 12-22-2011
20110309770LED LAMP HEAD WITH VARIABLE BRIGHTNESS - A lamp head is configured to be electrically coupled solely to a power-supply element and a return element. A power voltage carried by the power-supply element is regulated by a control element. The lamp includes at least one LED configured to emit light, and a first circuit coupled to the at least one LED and configured to adjust the brightness of the light emitted by the at least one LED solely in response to adjustments made to the power voltage by the control element.12-22-2011
20130187570LIGHT EMITTING ELEMENT DRIVE DEVICE - A light emitting element drive device with PWM dimming includes an LED module, a power conversion circuit that supplies electric power to the LED module, a dimming switch element that performs an open/close operation for a path in which a current flows in the LED module, and a voltage detection circuit that detects a voltage value of a voltage that is output from the power conversion circuit. When the dimming switch element is turned ON, a control circuit performs feedback control so as to make a current value of the current close to a first target value. When the dimming switch element is turned OFF, the control circuit performs feedback control so as to make the voltage value close to a second target value. Wherein, the first target value is a predetermined value and the second target value is set based on the voltage value.07-25-2013
20100127641SELF-OSCILLATING SWITCH CIRCUIT AND A DRIVER CIRCUIT COMPRISING SUCH A SWITCH CIRCUIT - A self-oscillating switch circuit is configured for use in a switching DC-DC converter (switched mode power supply (SMPS)). The self-oscillating switch circuit comprises an input terminal (Tin05-27-2010
20120019169DIMMABLE AMALGAM LAMP AND METHOD FOR OPERATING THE AMALGAM LAMP WHILE DIMMED - A dimmable amalgam lamp is provided having a quartz glass tube enclosing a discharge chamber comprising a filling gas, and closed by pinching at both ends thereof, through which at least one current feedthrough is fed through one coil-shaped electrode each in the discharge chamber, wherein at least one of the pinches has a hollow space having an opening to the discharge chamber for receiving a deposit of amalgam that can be heated by the coil-shaped electrode. In order to provide a method for operating the amalgam lamp on this basis, ensuring a high efficiency of UV-C radiation even when dimmed, the invention proposes that the current feedthrough include an outgoing line and a return line for an additional current I01-26-2012
20120019168ILLUMINATION CONTROL SYSTEM AND METHOD FOR CONTROLLING ILLUMINATION - According to one embodiment, an illumination control system includes a motion sensor and a central management server. The motion sensor acquires position information and action information of a person. The central management server holds holding position information of an illumination unit and necessary light amount information for action information of the person, acquires a necessary amount of light corresponding to the action information of the person based on the necessary light amount information, calculates a brightness control amount based on the position information of the illumination unit, and controls the illumination unit using the brightness control amount.01-26-2012
20120019167Backlight Control Circuit and Method Thereof - A backlight control circuit and method thereof are provided to control the backlight of a backlight module so as to enhance the dynamic contrast ratio and save power. The backlight control circuit includes an average luminance detection circuit, a luminance distribution detection unit, a pulse width control circuit and a pulse width modulator. The average luminance detection circuit detects the average luminance of a frame which includes a plurality of pixels; the luminance distribution detection unit detects the pixel luminance distribution of the frame; the pulse width control circuit generates a pulse width control signal according to the average luminance and the pixel luminance distribution of the frame; and the pulse width modulator generates a pulse width modulation (PWM) signal according to the pulse width control signal, so as to control the backlight of the backlight module.01-26-2012
20130193879Universal Dimmer - Various embodiments of a universal dimmer are disclosed. In one embodiment of a universal dimmer, a power limiting switch is connected to an input voltage. An output driver in the universal dimmer includes a power input and a load path, with the power input being connected to the input voltage. A variable pulse generator includes a control input and a pulse output, with the control input connected to a control input of the power limiting switch. The pulse output is connected to a control input of the power limiting switch.08-01-2013
20100060201METHOD OF CONTROLLING A BALLAST FOR A HIGH INTENSITY DISCHARGE LAMP AND RELATED SYSTEM - A method of controlling a ballast for a high intensity discharge (HID) lamp and related system. The method includes setting initial operating parameters of the ballast to turn on the HID lamp, generating starting transient electric characteristic values of the HID lamp by measuring actual electric parameters at a predetermined time during a transient process after the HID lamp is turned on, searching stored data for a rated power corresponding to the starting transient electric characteristic value range of the HID lamp after determining that the starting transient electric characteristic value is within stored starting transient electric characteristic value ranges of the HID lamp, and searching the stored data for a corresponding ballast operating parameter, to allow the HID lamp to operate in the corresponding rated power, and realize that a single ballast can be adapted to and control the HID lamps to operable in their respective specific rated power.03-11-2010
20130193877CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A dimming controller can operate in a first mode or a second mode to control dimming of a light-emitting diode (LED) light source. The dimming controller can include a voltage control terminal and a current control terminal. The voltage control terminal provides a pulse signal when the dimming controller operates in the first mode to operate a control switch in either a first state or a second state. A first current flowing through the LED light source increases when the control switch is in the first state and decreases when the control switch is in the second state. The voltage control terminal provides a control signal to the control switch to cut off the first current when the dimming controller operates in the second mode. The current control terminal conducts a second current through the LED light source when the dimming controller operates in the second mode.08-01-2013
20130193878LED-Lighting System Comprising an Operational Data Memory - The invention relates to an LED operating circuit in which a second module (08-01-2013
20130193880Power Supply Device and Lighting Equipment Provided with Power Supply Device - A power supply device according to one embodiment is configured to control a lighting of semiconductor light-emitting elements, wherein a dimming signal is canceled during a predetermined time period (T) from a timing immediately after power-ON, so as to light on light-emitting diodes to have a predetermined light amount, for example, a minimum light amount. After an elapse of the predetermined time period (T), cancellation of the dimming signal is released to light on the light-emitting diodes to have a light amount instructed by the dimming signal.08-01-2013
20130200822DIMMING CIRCUIT AND METHOD FOR LEDS - A dimming circuit and method for a LED provide a first driving voltage or a second driving voltage according to a dimming signal provided by a functional IC to enable or disable the LED. The values of the first and second driving voltages are controlled so that overstressing of the LED is avoided while the functional IC is capable of working even when the LED is off. The LED's life time is thus prolonged.08-08-2013
20120068624LIGHTING DEVICE WITH MULTI-POSITION JOYSTICK - Various lighting devices and related methods are provided. In one example, a portable lighting device includes a light source, lighting control circuitry, a body, and a tailcap assembly attached to an end of the body. The tailcap assembly includes a multi-position joystick adapted to pivot relative to the body in response to lateral pressure and move vertically relative to the body in response to vertical pressure. The tailcap assembly also includes switches adapted to provide signals to the lighting control circuitry in response to pivot movement and vertical movement of the joystick. The lighting control circuitry is adapted to operate the light source in response to the signals.03-22-2012
20120086361POWER SAVING ARRANGEMENT FOR USE WITH A USER IMPLEMENTABLE PHASE CUT DIMMER - A power saving arrangement for use with a phase cut dimmer, the power saving arrangement constituted of: a power converter arranged to convert a received alternating current power signal to a direct current signal; a detector arranged to detect the presence, or absence, of the phase cut dimmer blocking a portion of an alternating current mains power sine wave from reaching the power converter; and a controllable minimum holding current circuit in communication with the received alternating current power signal, the controllable minimum holding current circuit responsive to an output of the detector, wherein in the event that the detector detects the absence of the phase cut dimmer, the controllable minimum holding current circuit is disabled such that a minimum holding current is not provided.04-12-2012
20120086360ADJUSTABLE LIGHTING SYSTEM FOR FLUORESCENT LAMP AND SENSING APPARATUS OF THE ADJUSTABLE LIGHTING SYSTEM - An adjustable lighting system for fluorescent lamp, which includes a lighting unit, a sensing apparatus and a control apparatus, is provided. The lighting unit can emit a light. The sensing apparatus can sense if a target exists and generate a sensing signal accordingly. The sensing apparatus further generates and outputs a modulating signal based on the sensing signal. The control apparatus can receive the modulating signal from the sensing apparatus, adjust a supporting current of a power source and support the pulse width and phase level of the supporting current to the lighting unit, to control the strength of the light emitted by the lighting unit. Particularly, if the target exists, the modulating signal drives the control apparatus to provide a larger pulse width and phase level of the supporting current, so as to increase the strength of the light, or the modulating signal drives the control apparatus to provide a smaller pulse width and phase level of the supporting current, so as to decrease the strength of the light.04-12-2012

Patent applications in class Automatic regulation

Patent applications in all subclasses Automatic regulation