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Periodic-type current and/or voltage regulator in the supply circuit

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315 - Electric lamp and discharge devices: systems

315246000 - PULSATING OR A.C. SUPPLY

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DocumentTitleDate
20100109550LED Dimming Techniques Using Spread Spectrum Modulation - Circuits and methods of LED dimming are disclosed. Frequency modulation using controlled modulation depth generates deterministic sidebands of both the fundamental frequency and its harmonics. Various filters including low-pass, band-pass, high-pass and combinations of those are used to selectively filter the deterministic frequency components generated by the frequency modulation to achieve LED dimming.05-06-2010
20130026947Method Of Programming A Load Control Device Using A Smart Phone - A load control device is able to receive radio-frequency (RF) signals from a Wi-Fi-enabled device, such as a smart phone, via a wireless local area network. The load control device comprises a controllably conductive device adapted to be coupled in series between an AC power source and an electrical load, a controller for rendering the controllably conductive device conductive and non-conductive, and a Wi-Fi module operable to receive the RF signals from the wireless network. The controller controls the controllably conductive device to adjust the power delivered to the load in response to the wireless signals received from the wireless network. The load control device may further comprise an optical module operable to receive an optical signal, such that the controller may obtain an IP address from the received optical signal and control the power delivered to the load in response to a wireless signal that includes the IP address.01-31-2013
20090195179POWER LINE COMMUNICATION - Methods and systems for providing power line communications are provided. The methods employed by the system include receiving a line voltage, converting the line voltage to a DC voltage, and modulating the DC voltage with a data encoded signal to produce an output voltage. The methods also include communicating the output voltage to a remote device, where the output voltage is utilized to power the remote device and control operations of the remote device.08-06-2009
20100117554High Frequency Integrated HID Lamp With Run-Up Current - A high frequency ballast for a metal halide lamp comprises a controller, a switch, and an oscillator. The ballast is rated at a higher power than the steady state operating power of the lamp. The controller ignites the lamp at a frequency which is less than the steady state operating frequency of the lamp and ignites the lamp at a current which is greater than the steady state operating current of the lamp.05-13-2010
20100045201Circuit Arrangement and Method for Striking a Discharge Lamp - A circuit arrangement for striking a discharge lamp, comprising: a drive apparatus, having an output adapted to provide a drive signal with a predeterminable frequency; an inverter, which is coupled to the output of the drive apparatus, and having an output adapted to provide a square-wave signal with a predeterminable duty factor; a load circuit, which is coupled to the output of the inverter and has at least one terminal for the discharge lamp, the load circuit comprising a lamp inductor, which is coupled in series between the output of the inverter and the at least one terminal for the discharge lamp; a first control loop with a first reference variable, a first manipulated variable and a first controlled variable, the first control loop having a first time constant; a second control loop with a second reference variable, an auxiliary manipulated variable and a second controlled variable, the second control loop having a second time constant; and a strike detection apparatus, which is adapted to detect striking of the discharge lamp and, after detection of the striking to switch over the first and the second control loops from the striking operation mode to the continuous operation mode. The auxiliary manipulated variable of the second control loop represents the first reference variable of the first control loop, the first time constant being smaller than the second time constant by at least a factor of 10, and the first manipulated variable represents the duty factor of the output signal of the inverter.02-25-2010
20130038238PULSED OPERATION OF A DISCHARGE LAMP - A discharge lighting assembly and a method of operating a discharge lamp 02-14-2013
20100109551Light Source Package - A light source package includes a metal base adapted for engaging a suitable electrical socket; a transparent housing assembled with the base so as to form together with the base an accommodating space; and a light-emitting unit mounted within the accommodating space. The light-emitting unit has an LED die, and the LED die is operatively disposed in the accommodating space such that the light emitted from all of the six surfaces of the LED die is completely collected for illumination.05-06-2010
20100109549METHOD AND DEVICE FOR DRIVING A GAS DISCHARGE LAMP - A method is described for driving a lamp (L), specifically but not necessarily a gas discharge lamp. The lamp is driven with a pulse width modulated lamp current. The lamp current frequency is a constant frequency (fref) modulated with a random or at least pseudo05-06-2010
20120181947Light source driving circuit and display device including the same - A light source driving circuit for driving a light source includes a driving voltage generator configured to supply power to a light source, and a light source controller configured to generate a light source control signal for periodically turning on/off the light source, the light source being turned on again before being turned off completely.07-19-2012
20090302777PULSE GENERATOR USED FOR ELECTRONIC BALLAST - The present utility model proposes an impulse generator for driving an electronic ballast of a gas discharge lamp, the electronic ballast includes a resonance ignition circuit, characterized in that the impulse generator comprises: a micro-controller for generating a clock frequency signal, a logical time sequence control signal and a control voltage signal; a voltage controlled oscillator, coupled to the micro-controller, for receiving the logical time sequence control signal and the control voltage signal to generate oscillation and output a voltage controlled oscillating frequency signal; a phase comparator for receiving the clock frequency signal and the voltage controlled oscillating frequency signal to perform a logical exclusive-OR operation and output an impulse signal of corresponding frequency, thereby driving the resonance ignition circuit to generate a resonance voltage. In addition, the utility model also proposes an over-voltage protection circuit used for the electronic ballast.12-10-2009
20130162167THRESHOLD-BASED ZERO-CROSSING DETECTION IN AN ELECTRICAL DIMMER - Threshold-based zero-crossing detection is provided. A power phase threshold detector detects when absolute value of a voltage level of the electrical power rises above a non-zero voltage threshold and outputs a zero-crossing signal to a controller to indicate occurrence of the zero-crossing. Delaying the zero-crossing signal to the point when the absolute value of the voltage level of the electrical power rises above the non-zero voltage threshold ensures completion of the zero-crossing of the power phase prior to signaling the controller. The controller provides signals to a switching circuit for controlling switching of electrical power to a load based on the zero-crossing indications.06-27-2013
20130162168TIMER-BASED SWITCHING CIRCUIT SYNCHRONIZATION IN AN ELECTRICAL DIMMER - Timer-based switching circuit synchronization in an electrical dimmer is provided. The energizing of a switching circuit in a dimmer is synchronized with an AC wave to facilitate providing by the dimmer electrical power to a load. The synchronizing includes starting a timer having a predetermined timeout, responsive to receipt of a zero-crossing signal. Responsive to receipt of a subsequent zero-crossing signal prior to reaching the timeout, the timer is restarted, and responsive to expiration of the timeout, a switching circuit is energized at a predetermined firing angle with respect to the zero-crossing signal to supply electrical power to the load.06-27-2013
20120091910Dimming Control for Electronic Lamp - In one embodiment, an apparatus includes circuitry configured to receive a dimming input to control a dimming level of a lamp. Also, the apparatus includes circuitry configured to generate a control signal based on the dimming input. The control signal indicates the dimming level for a converter of the lamp and the converter is configured to interpret the control signal to control to the dimming level of the lamp using a sinusoidal signal.04-19-2012
20100026201DISPLAY APPARATUS HAVING REDUCED WATERFALL NOISE - A display device with improved display quality is provided. The display device includes an LED light source emitting light, a display panel receiving the light to display an image, and a backlight driver adjusting the magnitude and the duty ratio of an LED current I_LED flowing through the LED light source. The waveform of the LED current I_LED includes at least one of a rising section in which the magnitude of the LED current more gradually increases from a turn-off current value to a peak value, and a falling section in which the magnitude of the LED current more gradually decreases from the peak value to the turn-off current value. This acts to reduce waterfall noise.02-04-2010
20120286694METHOD OF POWER AND TEMPERATURE CONTROL FOR HIGH BRIGHTNESS LIGHT EMITTING DIODES - Various embodiments relate to a method for driving a light emitting diode (LED) flash including: measuring a junction temperature of the LED by applying a test current to the LED and measuring the LED forward voltage; determining the drive current based upon the measured junction temperature and measured data characteristics of the LED; and applying the drive current to the LED for a specified length of time.11-15-2012
20110043125LED DRIVING UNIT - A daisy chain dimming solution can be applied in all kinds of LED driver topologies. A central idea is to measure or sense the current levels or pulse width modulation duty cycles in a previous segment (N−I) in a chain of segments of LED driving units with associated LED strands, and control the current through the next segment (N) based on the sensed current through the previous. For example, each LED driving unit (02-24-2011
20090206768METHOD AND DEVICE FOR DRIVING A LAMP - A method is described for driving a lamp with a periodic signal (L) having a frame period (t08-20-2009
20110285308Dimmable thermally controlled safety light emitting diode illumination device - A Light Emitting Diode safety illumination device with thermal control and dimming compatibility for use with incandescent light dimmers and light fixtures. Circuit method and structure combine to provide thermal curve management of temperature control parameters overriding and taking priority over power and dimming of the intensity of illumination.11-24-2011
20110291583DIMMER CIRCUIT APPLICABLE FOR LED DEVICE AND CONTROL METHOD THEREOF - A dimmer circuit applicable for LED device and control method thereof is disclosed in the embodiments of the present invention. The dimmer circuit is applicable for controlling at least a LED device. The dimmer circuit includes a rectifier, a bleeder, a phase angle detect circuit, a constant current circuit and a programmable micro controller. The phase angle detect circuit couples to the programmable micro controller. The constant current circuit couples to the LED device The programmable micro controller generates a PWM signal according to the output signal of the phase angle detect circuit to adjust current of the constant current circuit.12-01-2011
20100090612Portable Lighting Device Having User Selectable Light Control - A lighting device embodied as a flashlight is provided that includes a handheld housing and a light source provided on the housing for generating a light beam. The light device also includes a battery power source for providing power to the light source. The lighting device further includes light control circuitry for turning the light source on and off and controlling intensity of the light beam. The light control circuitry includes a user actuatable switch and a controller for controlling intensity of the generated light beam. The controller processes user activation of the switch and adjusts the intensity of the light beam as a function of the activation of the switch such that the light intensity may be increased or decreased.04-15-2010
20100090613Lighting Device Having Light Intensity Control - 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. At least one switch is provided for turning at least one of the light sources on and off and further adjusting light intensity of the light source. The light source of the lighting device may further be controlled based on a detected chemistry composition of the power source.04-15-2010
20100066263Compact Flashlight - A flashlight is provided with an end cap which carries an axially-actuated switch for turning the flashlight on and off with a convenient one-handed operation. The switch is designed with a latching function and a mode selection function which can be cycled through high, low and strobed light outputs with a partial throw of the switch. Cut-out portions are provided in the end cap for guiding a user's finger toward the switch and away from the sidewalls of the end cap.03-18-2010
20100033106HIGH-PRESSURE DISCHARGE LAMP, HIGH-PRESSURE DISCHARGE LAMP LIGHTING SYSTEM AND LIGHTING EQUIPMENT - Disclosed is a high-pressure discharge lamp includes a translucent ceramics sealed container provided with an enclosed part with a discharge space formed therein, a pair of electrodes disposed inside of both end parts of the translucent sealed container, an ionization medium having a structure containing a metal halide that primarily emits light, a starting gas and substantially no mercury, the metal halide that primarily emits light including 30% by mass or more of a halide of at least one lanthanoid type rare earth metal and the starting gas having a pressure P (atm) satisfying the equation, 1≦P≦20, the ionization medium being sealed in the translucent ceramics sealed container, wherein the ratio D/G satisfies the equation, 0.3≦D/G≦2.4 when the maximum inside diameter of the translucent ceramics sealed container is D and the inter-electrode distance is G.02-11-2010
20090146579DISCHARGE-LAMP LIGHTING DEVICE AND LUMINAIRE - There is provided a discharge-lamp lighting device that, upon start-up of a high-intensity discharge lamp, alternately outputs a period A during which a starting circuit applies a high voltage to the high-intensity discharge lamp by resonance operation when a DC/AC inverter outputs a high-frequency voltage, and a period B during which the DC/AC inverter applies a low-frequency-square-wave voltage or a DC voltage to the high-intensity discharge lamp via the starting circuit. The period A for applying the high voltage by the resonance operation is set to about a time enough for a high-intensity discharge lamp in an initial aging stage to cause a dielectric breakdown, and a period C for alternately outputting the high-voltage generating period A and the period B for outputting the low-frequency-square-wave voltage or the DC voltage is set to about a time enough for a high-intensity discharge lamp in a life's last stage to cause a dielectric breakdown.06-11-2009
20100117553Illumination Apparatus - Embodiments provide an illumination apparatus including an adapter coupled detachably and electrically to an incandescent lamp socket or a halogen lamp socket, configured to convert alternating power to driving power; and a light emitting device connected detachably and electrically to the adapter, configured to emit light according to the driving power from the adapter.05-13-2010
20110062883System And Apparatus For Cathodoluminescent Lighting - A cathodoluminescent lighting system has a light emitting device having an envelope with a transparent face, a cathode for emitting electrons, an anode with a phosphor layer and a conductor layer. The phosphor layer emits light through the transparent face of the envelope. The system also has a power supply for providing at least five thousand volts of power to the light emitting device, and the electrons transiting from cathode to anode are essentially unfocused. Additional embodiments responsive to triac-type dimmers with intensity and color-changes in response to dimmer control. A power-factor-corrected embodiment is also disclosed.03-17-2011
20110062882SYSTEMS AND METHODS FOR DRIVING A LIGHT SOURCE - A circuit for driving a light source includes a voltage converter, a switch and a controller. The voltage converter converts an AC input voltage signal to a first rectified AC voltage signal. The voltage converter further generates an average signal proportional to an average voltage level of the first rectified AC voltage signal. The switch is coupled to the light source in series. The controller coupled to the voltage converter and the switch compares the first rectified AC voltage signal with the average signal to generate a pulse signal. The controller further generates a dimming control signal based on the pulse signal to control the switch thereby controlling dimming of the light source.03-17-2011
20090236999DISCHARGE LAMP LIGHTING DEVICE AND LIGHT FIXTURE - In a discharge lamp lighting device that, at a time of starting a discharge lamp La, alternately repeats periods HF09-24-2009
20100123410Driving and Dimming Control Device for Illuminator - The driving and dimming control device for illuminator includes an AC power input end connecting to a phase dimmer, a DC power output end for connecting to a lighting load, a rectifier connecting to the AC power input end, a pulse width modulator connecting to a transformer, a voltage/current detector, a photo-coupler connecting between the voltage/current detector and pulse width modulator, and a low-voltage-input locking circuit connecting between an output terminal of the phase dimmer and pulse width modulator. The low-voltage-input locking circuit includes a locking switch and a reset switch. The signals input to the pulse width modulator are locked by the locking switch to prohibit the pulse width modulator from hiccupping. Thus the DC output power can be stabilized.05-20-2010
20090278468Device and Method for Operating a High-Pressure Discharge Lamp - A device for operating a high-pressure discharge lamp (11-12-2009
20090289572IGNITION FOR CERAMIC METAL HALIDE HIGH FREQUENCY BALLASTS - A high frequency ballast for a metal halide lamp comprises a controller, a switch, and an oscillator. The controller selectively enables and disables the oscillator via the switch to ignite the lamp. The switch is in a power supply loop of the oscillator and selectively open circuits and close circuits the power supply loop. When the switch close circuits the power supply loop, the oscillator oscillates and provides power to the lamp. When the switch open circuits the power supply loop, the oscillator does not oscillate and does not provide power to the lamp.11-26-2009
20110199014Dimmer Circuit for Electronic Loads - In one embodiment, a dimmer circuit is coupled to an electronic load and receives an alternating current (AC) signal. A phase control circuit turns the dimmer circuit on for a first portion of the AC signal to turn on the electronic load. The dimmer circuit turns off during a second portion of the AC signal to turn off the electronic load. A switch is coupled to the phase control circuit. The switch is controlled to couple the phase control circuit to ground when the dimmer circuit is off where the switch is part of a power supply supplying power to the electronic load.08-18-2011
20110266968METHOD AND DEVICE FOR OBTAINING CONDUCTION ANGLE, METHOD AND DEVICE FOR DRIVING LED - In various embodiments, a method for obtaining a conduction angle of a trailing edge dimmer is provided. The method may include determining a time point t11-03-2011
20100141167ILLUMINATION APPARATUS - An illumination apparatus used in non-light emission transparent display devices includes a base material, light emitting elements arranged two dimensionally on the surface of the base material, a drive section driving the light emitting elements, and a light emitting intensity control section controlling a light emitting intensity of the light emitting elements. An arrangement of the light emitting elements is such that a density at ends of the base material is high compared to that in a center part thereof, and the ends have a high density in regions where the base temperature is high and the center part has a high density in regions where the base material temperature is high.06-10-2010
20100264842DEVICE FOR EMITTING VARIOUS COLORS - A device for emitting various colors by mixing light from a first light emitting diode and light from a second light emitting diode comprises, according to one embodiment: the first light emitting diode including an LED chip comprising InGaN and being capable of emitting a blue color light, and a phosphor capable of absorbing a part of the blue color light and emitting a yellow color light, the blue color light and the yellow color light being mixed to make white-color light; the second light emitting diode being capable of emitting red, green or blue color light; and a drive circuit for separately driving each of the first and second light emitting diode.10-21-2010
20100201283DRIVING DEVICE - A driving device comprises a first transistor (B08-12-2010
20100201282LIGHT EMITTING DIODE DRIVING DEVICE AND DRIVING METHOD THEREOF - A light emitting diode driving device and driving method thereof are provided. The light emitting diode driving device includes a duty cycle setup unit, a current setup unit, a control unit, and a light emitting diode driving circuit. The duty cycle setup unit is used for outputting duty cycle setup signal. The current set up unit is used for outputting a current setup signal. The control unit is used for receiving the duty cycle setup signal and the current setup signal, and outputting a current control signal and a duty cycle control signal in response to the duty cycle setup signal and the current setup signal. The light emitting diode driving circuit is used for driving at least one light emitting diode in response to the current control signal and the duty cycle control signal.08-12-2010
20110221358Driving Device, Light Emitting Diode Driving Device and Driving Method Thereof - A driving device, a light emitting diode (LED) driving device and a method thereof are provided. The driving device includes a driving unit and a plurality of selection units. The driving unit produces a driving signal to drive a light emitting diode. The selection units are coupled to the driving unit and respectively correspond to a current value. The driving unit selects one of the selection units according a first pulse width modulation (PWM) signal. The current value corresponding to the selected selection unit is taken as the current value of the driving signal. The driving unit generates a duty cycle of a second PWM signal according to the duty cycle of the first PWM signal to serve as a duty cycle of the driving signal. In this way, power consumption of the LED is reduced.09-15-2011
20100156312ELECTRONIC BALLAST FOR RESTARTING HIGH-PRESSURE DISCHARGE LAMPS IN VARIOUS STATES OF OPERATION - A high-pressure discharge lamp ballast is provided for igniting and re-igniting a high-pressure discharge lamp in various states of operation. A power supply circuit is coupled to a power source and supplies AC power to the lamp. An ignition voltage generating circuit supplies a high-voltage ignition pulse for igniting the lamp. A pulse control circuit alternatively controls the ignition voltage generating circuit in a first control mode to provide the high-voltage ignition pulses for a first time period and in a second control mode to delay the high-voltage ignition pulses for a second time period. An abnormality detection circuit detects an abnormal lighting state of the lamp wherein a measured condition of the lamp corresponds to a predetermined condition. The pulse control circuit increases a ratio of the second time period relative to the first time period upon detection of an abnormal lighting state of the lamp by the abnormality detection circuit.06-24-2010
20110227501ULTRAVIOLET LIGHT IRRADIATION DEVICE - The present invention provides an ultraviolet light irradiation device having a planer UV light source in which the irradiation intensity of UV light can be adjusted finely in a wider range. The ultraviolet light irradiation device of the present invention comprises an UV light source and a housing that holds the planer UV light source. In the UV light source, a plurality of thin plasma tubes, each of which has an UV phosphor layer formed therein, are arranged in parallel with each other on an electrode support sheet, and drive circuits apply a pulse voltage to electrode pairs provided between the electrode support sheet and an array of the thin plasma tubes. A control circuit controls a factor of the pulse voltage to be applied to the electrode pairs so as to adjust the irradiation intensity of the UV light.09-22-2011
20110140628POWER SUPPLY FOR LIGHTING LUMINARY FOR IMPROVING DIMMING PERFORMANCE - A power supply for a lighting luminary for improving dimming performance is disclosed. The power supply is applied to an AC source, a TRIAC dimmer, and at least one lighting luminary. The power supply includes a half-wave rectifier, an input voltage detector, a dimming signal generator, a feedback circuit, and a DC-to-DC converter. The input voltage detector is electrically connected to the half-wave rectifier. The dimming signal generator is electrically connected to the input voltage detector. The feedback circuit is electrically connected to the dimming signal generator. Besides, the DC-to-DC converter is electrically connected to the half-wave rectifier. More particularly, the half-wave rectifier provides a single-direction current path to avoid turning off the TRIAC dimmer during the dimming process because of the alternating positive and negative half cycles of the AC source.06-16-2011
20090212714DRIVING METHOD AND DRIVING DEVICE FOR DISCHARGE LAMP, LIGHT SOURCE DEVICE, AND IMAGE DISPLAY DEVICE - A driving method for a discharge lamp that lights by performing discharge between two electrodes while alternately switching a polarity of a voltage applied between the two electrodes includes: modulating an anode duty ratio, which is a ratio of an anode time for which one of the electrodes operates as an anode in one period of the polarity switching, within a predetermined range; and changing the predetermined range to make a maximum value of the modulated anode duty ratio higher than a maximum value of an initial anode duty ratio of the discharge lamp when a predetermined condition is satisfied.08-27-2009
20090243506METHOD AND DEVICE FOR DRIVING A LAMP - A method for driving a lamp with a variable duty cycle in a timing relationship with an input image signal (Si) comprises the steps of: receiving the image signal having a predetermined frame period (t10-01-2009
20110140629POWER SUPPLY FOR LIGHTING LUMINARY FOR FIXING MAXIMUM AND MINIMUM ILLUMINATION - A power supply for a lighting luminary for fixing maximum and minimum illumination is applied to a TRIAC dimmer and at least one lighting luminary. The power supply includes a dimming circuit for fixing maximum and minimum illumination, an input voltage detector, a feedback circuit, a DC-to-DC converter, and a rectifier. The dimming circuit for fixing maximum and minimum illumination outputs a reference voltage. More particularly, the feedback circuit controls the lighting luminary be operated at maximum illumination when a conduction angle of the TRIAC dimmer is excessive according to the reference voltage. Similarly, the feedback circuit controls the lighting luminary to be operated at minimum illumination when a conduction angle of the TRIAC dimmer is excessively small.06-16-2011
20100264841DEVICE FOR EMITTING WHITE-COLOR LIGHT - A device for emitting white-color light comprises: a light emitting diode including: an LED chip comprising a gallium nitride compound semiconductor containing indium and being capable of emitting a blue color light, and a phosphor capable of absorbing a part of the blue color light and emitting a light having longer wavelength than the blue color light, the blue color light and the light from the phosphor being mixed to make the white-color; a control unit for converting an input to pulse signals; and a driver receiving the pulse signals from the control unit to drive the LED chip, wherein the brightness of the white-color light from the light emitting diode is controlled by a width of the pulse signals.10-21-2010
20100156311Electronic Device and Light Emission Control Method For Electronic Device - In an electronic device having a light emitting section that emits light by utilizing recombination of electrons and holes and in a light emission control method for this electronic device, an electronic device and a light emission control method for this electronic device are provided in which lifetime improvement is achieved in the light emitting section.06-24-2010
20100176740FEEDFORWARD CONTROL OF SEMICONDUCTOR LIGHT SOURCES - A control method for a semiconductor light source may include operating the semiconductor light source with short, powerful pulses by an operating device; storing the characteristic light decrease of the semiconductor light source depending on the power introduced into the semiconductor light source in the operating device; and altering power introduced during the pulse in such a way that the emitted quantity of light of the semiconductor light source substantially remains constant over the pulse duration.07-15-2010
20100188012APPARATUS AND METHOD FOR DIMMING A BACKLIGHT WITH PSEUDO-RANDOM PHASE DELAY - A method for generating an actuation signal for a light source is provided. A random phase delay for each period of an input signal is generated, where each period is a predetermined length. Each phase delay is added to a predetermined actuation period to generate a sum. The sum is compared to the predetermined length. At least one turn-on and at least one turn-off for each period of the input signal is calculated from the comparison of the sum to the predetermined length, and the actuation signal having each turn-on and each turn-off is generated.07-29-2010
20100277089LED LIGHT HAS GEOMETRIC-UNIT(S) INCORPORATED WITH PROJECTION MEANS - The current invention disclosure LED light has geometric-unit(s) incorporate with project means(s) to has different distance-area(s) illumination from LED means on its body and project means. Further incorporated power saving circuit which has flashing quickly than human eye's response time and each flashing has duty cycle for “On” and “Off” at desired percentage (%) to make power saving purpose. The current invention for all kind of LED light for indoor or outdoor use for home, building, street, transportation equipments for people stay with more than one illumination areas with different distance from said the LED means.11-04-2010
20100127633METHOD FOR DRIVING A LAMP IN A LIGHTING SYSTEM BASED ON A GOAL ENERGIZING LEVEL OF THE LAMP AND A CONTROL APPARATUS THEREFOR - A method and a control apparatus for driving a lamp 05-27-2010
20100164394LED CONTROL CIRCUIT AND METHOD - A LED control circuit and method determine the frequency and duty of a LED driving signal according to a swing control signal and a dimming control signal, respectively. Responsive to the swing control signal, a pulse edge generator generates a clock whose frequency is determined by the swing control signal. Responsive to the clock and the dimming control signal, a duty ratio controller generates the LED driving signal whose frequency is determined by the clock frequency and whose duty is determined by the dimming control signal.07-01-2010
20100072913High pressure discharge lamp lighting device and luminaire using same - A high pressure discharge lamp lighting device includes a DC power source circuit; a power supply circuit for converting an output from the DC power source circuit into a square wave AC output to be supplied to a high pressure discharge lamp; a starting circuit for applying a high voltage output for lamp startup to the high pressure discharge lamp; a control circuit; and a half-wave discharge detection circuit for detecting a half-wave discharge. The detection circuit detects the half-wave discharge at an initial stage of the lamp startup and the control circuit controls the magnitude of a voltage of a square wave half period of one polarity having a load voltage of a larger magnitude and that of a square wave half period of the other polarity having a load voltage of a smaller magnitude to approximate to each other.03-25-2010
20120194093HIGH EFFICIENCY LIGHTING ASSEMBLY - A lighting assembly (08-02-2012
20090322245DISCHARGE LAMP LIGHTING APPARATUS - A discharge lamp lighting apparatus includes a DC/AC converter for converting a supplied direct voltage to an alternating voltage and then outputting the alternating voltage, a high-voltage generator for superposing a pulse voltage on the alternating voltage supplied from the DC/AC converter and then outputting the alternating voltage, and a microprocessor for providing a timing to control the high-voltage generator in such a manner that the pulse voltage is superposed on the alternating voltage in synchronism with the alternating voltage.12-31-2009
20100134037Light Source Emitting Mixed-Colored Light and Method for Controlling the Color Locus of Such a light Source - A light source (06-03-2010
20110018459Method and Operating Device for Minimizing the Insulation Stress of a High-Pressure Discharge Lamp System - A method for minimizing the insulation stress of a high-pressure discharge lamp system, with an operating device, which generates a high voltage for starting the high-pressure discharge lamp, wherein a starting voltage time sum applied during lamp starting is minimized, the starting voltage time sum is the sum of all time segments Z01-27-2011
20110115399Universal 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. The variable pulse generator is adapted to effectively vary a duty cycle at the pulse output. The universal dimmer also includes a load current detector having an input and an output. The load current detector input is connected to the output driver load path. The load current detector output is connected to the variable pulse generator control input. The variable pulse generator and the load current detector are adapted to limit the effective duty cycle when a load current reaches a maximum current limit to substantially prevent the load current from exceeding the maximum current limit.05-19-2011
20110115400LED DIMMER CONTROL - A circuit dims an LED based on a duty cycle detected in an incoming power signal.05-19-2011
20110127925TRIAC DIMMER COMPATIBLE WLED DRIVING CIRCUIT AND METHOD THEREOF - The present technology is generally related to Triac dimmer compatible driving circuits and methods thereof. The present technology also provides an electronic transformer that is integrated in the Traic dimmer compatible driving circuit. In one embodiment, the electronic transformer detects the conduction angles of an output AC voltage from the Triac dimmer and converts said output AC voltage into a PWM DC voltage having a duty cycle regulated by said conduction angles. Said PWM DC voltage is then applied to a WLED driver for driving a WLED.06-02-2011
20110241561Method of Controlling an Electronic Dimming Ballast During Low Temperature Conditions - An electronic ballast circuit for driving a gas discharge lamp is operable to control the lamp to avoid flicking and flashing of the intensity of the lamp during low temperature conditions. The ballast circuit includes an inverter circuit for receiving a DC bus voltage and for generating a high-frequency output voltage, a resonant tank circuit for receiving the high-frequency output voltage and generating a sinusoidal voltage for driving said lamp, and a control circuit operatively coupled to the inverter circuit for adjusting an intensity of the lamp between a minimum intensity and a maximum intensity. The control circuit receives a control signal representative of a lamp temperature of the lamp, and increases the minimum intensity of the lamp if the lamp temperature of the lamp drops below a cold temperature threshold. In addition, the ballast circuit may also include a temperature sensing circuit operable to generate the control signal representative of the lamp temperature of the lamp.10-06-2011
20110133665LUMINANCE ADJUSTING DEVICE - A luminance adjusting device for an illuminator utilizes a circuitry to control the brightness of the illuminator, wherein power is stored in a power storage through a step-down circuit. The illuminator has a preset brightness. The preset brightness is done by the calculating processor to run according to an analyzed data received from a sampling frequency circuit to control a pulse modulator for driving the illuminator to emit light. The power switch is turned off and on again shortly, which triggers the calculating processor to control the pulse modular to drive the illuminator to change the preset brightness, so that the brightness of the illuminator is controlled by the time differentials of the power switch's on and off.06-09-2011
20090218955METHOD OF DRIVING DISCHARGE LAMP, DRIVING DEVICE, AND PROJECTOR - A method for driving a discharge lamp that supplies an AC current to a discharge lamp having a first electrode and a second electrode so as to produce discharge and to cause the discharge lamp to emit light includes the steps of, during a steady operation in which the AC current is supplied to the first electrode and the second electrode, when power of the same amount is fed to the first and second electrodes, and a tip portion of the first electrode becomes higher than a tip portion of the second electrode in temperature, changing the duty ratio of the AC current to be supplied between the first electrode and the second electrode in accordance with a predetermined pattern, and setting a current value when the first electrode operates as an anode during one cycle so as to be smaller than a current value when the second electrode operates as an anode during one cycle.09-03-2009
20090322246Discharge Lamp Ballast and Fixture with Controlled Preheating - Electrical characteristics associated with a filament resistance are detected to control a preheating amount so as to heat a filament into an optimum state for emission in accordance with determined preheating time.12-31-2009
20100072912Side-Type Backlight Module and Operating Method Thereof - A side-type backlight module includes a light guide plate and a plurality of light emitting diode (LED) sources. The light guide plate includes a side. The LED sources are disposed on the side, in which two successive LED sources are spaced by a pitch. It is varied to arrange each pitch between two successive LED sources. Moreover, a method for operating the side-type backlight module is disclosed in the specification.03-25-2010
20110095695Illuminating System Having Sequential Color Filtering And A High-Pressure Discharge Lamp - A novel operating method and corresponding ballast for illuminating systems having temporally sequential color filtering and a high-pressure discharge lamp operated by alternating current. In this case, at least three commutations of the lamp current are used within a color filtering sequence, in order to be able to operate the lamp advantageously without an excessive increase in the operating frequency of the color filter system.04-28-2011
20100060185LIGHTING DEVICE WITH MULTIPLE PRIMARY COLORS - The invention relates to a lighting device (03-11-2010
20110095698ILLUMINATION LIGHTING APPARATUS, ILLUMINATION APPARATUS, AND ILLUMINATION SYSTEM - An illumination lighting apparatus is connected to, as an external apparatus, any of a human body sensing sensor configured to detect presence/absence of a person, an illuminance sensor configured to detect space illuminance, and a dimmer which arbitrarily adjusts the space illuminance, and is configured to produce an output control signal for controlling an optical output of a light source based on a signal output from the external apparatus. The illumination lighting apparatus includes: an external apparatus determining unit configured to determine which kind of the external apparatus is connected based on the signal output from the external apparatus; and a signal processing unit configured to produce the output control signal based on the signal output from the external apparatus.04-28-2011
20100066262DRIVER FOR OPERATING A GAS DISCHARGE LAMP03-18-2010
20110175539Light Source System Capable of Dissipating Heat - A light source system capable of dissipating heat includes a AC power supply for outputting a first power, a switch device for adjusting an output ratio of the first power according to a light setting, a light emitting device for generating a light source, and a control device for generating an active signal sequence, an heat-dissipation signal sequence and a burst signal according to lighting features of the light emitting device, and combining the active signal sequence and the heat-dissipation signal sequence, to generate a driving signal sequence, for timely outputting the driving signal sequence according to the burst signal, so as to generate the control signal.07-21-2011
20110074307ELECTRONIC BALLAST AND METHOD FOR PROVIDING A DC VOLTAGE COMPONENT DURING LAMP STARTUP - A discharge lamp ballast and method of operation are provided for generating a DC component in an output voltage during a lamp starting operation having a predetermined duration. The ballast includes an inverter having four switches arranged in a full-bridge configuration, a resonant circuit having a resonant frequency, and a control circuit. The method includes a step of sweeping an inverter operating frequency within a predetermined frequency range including the resonant frequency, wherein a high voltage is generated for igniting the lamp. The method further includes periodically and alternately repeating a first state of turning on a first set of diagonally positioned switching elements and turning off a second set of diagonally positioned switching elements, and a second state of turning on only one of the second set of switching elements and turning off the remaining three switching elements, respectively.03-31-2011
20110074306LED DIMMING APPARATUS, CIRCUIT, AND METHOD THEREOF - Disclosed is a LED dimming apparatus, which uses a conventional light modulator in conjunction with a rectification circuit, an active matching circuit, an analog/digital converter circuit and a pulse width modulation circuit to control brightness of a LED light source apparatus. The conventional light modulator produces a dimming signal. The matching circuit connects to the light modulator for receiving the dimming signal to convert it to a matching signal with the lowest output current. The analog/digital converter circuit connects to the matching circuit for receiving the matching signal and converting it to a conversion signal with positive half cycles of a sinusoidal waveform. The pulse width modulation circuit connects to the analog/digital converter circuit for receiving the conversion signal and producing a pulse width modulation signal with a stable output current. The LED light source apparatus connects to the LED dimming apparatus, receiving the modulation signal to control the brightness.03-31-2011
20110074308CONTROLLER FOR CONTROLLING DIMMING OF A LIGHT SOURCE - A controller for controlling dimming of a light source includes a detector, a dimming signal generator coupled to the detector, and a pulse generator coupled to the dimming signal generator. The detector can detect a startup phase of a burst dimming cycle of the light source and can generate a triggering signal when the startup phase ends. The burst dimming cycle includes an ON period and an OFF period. The dimming signal generator can trigger the ON period of the burst dimming cycle for a predetermined duration in response to the triggering signal. The pulse generator operable for generating a pulse signal to control a current through the light source can be enabled during the ON period and disabled during the OFF period.03-31-2011
20110025223HIGH PRESSURE DISCHARGE LAMP BALLAST AND LIGHT SOURCE APPARATUS - Even when usable driving frequencies are limited, a lamp voltage is appropriately controlled. A high pressure discharge lamp ballast performs driving with a synthesized current waveform comprising a combination of first and second sets of current waveforms. The ballast includes: a control means for controlling content rates of each of the sets per unit time; a detection means for detecting a rotation synchronization signal for a color wheel; an output means for applying a synthesized current waveform in accordance with the synchronization signal and the content rates to a high pressure discharge lamp; and a detection means for detecting a lamp voltage. The sets are each in a waveform inverted so as to correspond to at least one of a rotational speed and segment positions of color wheel. A period of each of the first and second sets has a length equivalent to one rotation of the color wheel. The number of inversions of the second set is larger than the number of inversions of the first set. The ballast is configured in that the content rate of the second set is set to R02-03-2011
20110025222HIGH PRESSURE DISCHARGE LAMP BALLAST AND LIGHT SOURCE APPARATUS - In a frequency control for a high pressure discharge lamp ballast, short-term increase and decrease of a lamp voltage are suppressed. The high pressure discharge lamp ballast drives a high pressure discharge lamp with a synthesized-waveform alternating current made of multiple frequency components, the high pressure discharge lamp having a pair of electrodes disposed to face each other. The ballast includes: a control means for controlling a component contained ratio of the multiple frequency components per unit time; an output means for applying a synthesized-waveform current in accordance with the component contained ratio to the high pressure discharge lamp; and detection means for detecting a lamp parameter of the high pressure discharge lamp. The control circuit is configured to shift the component contained ratio to a first component contained ratio when the lamp parameter is in a first state, and shift the component contained ratio to a second component contained ratio when the lamp parameter is in a second state. The control circuit is configured to change the component contained ratio stepwise when the component contained ratio is shifted from the first component contained ratio to the second component contained ratio, or when the component contained ratio is shifted from the second component contained ratio to the first component contained ratio.02-03-2011
20100033105DRIVING DEVICE AND DRIVING METHOD OF ELECTRIC DISCHARGE LAMP, LIGHT SOURCE DEVICE, AND IMAGE DISPLAY APPARATUS - A driving device of an electric discharge lamp includes: a discharge lamp lighting unit which supplies power to the electric discharge lamp while alternately switching polarity of voltage applied between two electrodes of the electric discharge lamp to lighting the electric discharge lamp; and an anode duty ratio modulating unit which sets at least a first retention period and a second retention period having an anode duty ratio different from that of the first retention period and provided after the first retention period to modulate the anode duty ratios, assuming that each of the retention periods is a period for retaining an anode duty ratio as ratio of an anode period in which one of the electrodes operates as anode at a constant value in one cycle of the polarity switching, wherein the anode duty ratio modulating unit has a first modulation mode for operating the electric discharge lamp in steady condition and a second modulation mode for providing larger change of the anode duty ratio between the first retention period and the second retention period than change of the first modulation mode.02-11-2010
20100295465LIGHT EMITTING ELEMENT, LIGHT EMITTING DEVICE, IMAGE DISPLAY DEVICE, METHOD OF DRIVING LIGHT EMITTING ELEMENT, AND METHOD OF PRODUCING LIGHT EMITTING ELEMENT - A light emitting element of the present invention includes an electrode substrate; a thin-film electrode; and an electron acceleration layer sandwiched between the electrode substrate and the thin-film electrode. In the electron acceleration layer, as a result of a voltage applied between the electrode substrate and the thin-film electrode, electrons are accelerated so as to be turned into hot electrons. The hot electrons excite surfaces of the silicon fine particles contained in the electron acceleration layer so that the surfaces of the silicon fine particles emit light. Such a light emitting element of the present invention is a novel light emitting element, which has not been achieved by the conventional techniques. That is, the light emitting element of the present invention is able to (i) be produced by using a silicon material, which is available at low price, through a simple production method, and (ii) efficiently emit light.11-25-2010
20120169247METHOD OF DRIVING DISCHARGE LAMP, DRIVING DEVICE, AND PROJECTOR - In at least one embodiment of the disclosure, a method for driving a discharge lamp includes changing a duty ratio of an AC current to be supplied between a first electrode and a second electrode of the discharge lamp in accordance with a predetermined pattern, and setting a current value when the first electrode operates as an anode during one cycle so as to be smaller than a current value when the second electrode operates as an anode during one cycle.07-05-2012
20110115401METHOD AND APPARATUS FOR CONTROLLING BRIGHTNESS OF LIGHT EMITTING DIODES - A circuit for driving a light emitting diode (LED) comprises: an alternating voltage power supply, comprising a triac dimmer having a firing angle and output terminals that provide power to the LED; a zero crossing detector that detects a polarity change of the alternating voltage provided by the alternating voltage power supply and provides a zero crossing output signal indicative of the zero crossing; a timer triggered by the zero crossing output signal that generates a timer output signal during a time period of the timer; and LED power circuitry that reduces current to the light emitting diode based upon timing characteristics of the timer output signal.05-19-2011
20100253239BRIGHTNESS CONTROL OF A STATUS INDICATOR LIGHT - An apparatus and method for controlling the brightness and luminance of a light, such as an LED. The embodiment may vary the brightness and luminance of the LED in a variety of ways to achieve a variety of effects. The exemplary embodiment may vary the rate at which the LED's luminance changes, such that an observer perceives the change in the LED's brightness to be smooth and linear as a function of time, regardless of the ambient light level. Changes to the LED's luminance may be time-constrained and/or constrained by a maximum or minimum rate of change.10-07-2010
20100259183Method and apparatus for LED dimming - A dimmable LED driver provides accurate full range dimming for LED lighting. The driver utilizes the timing of an AC signal rather than its power output or other characteristics to accurately determine the level of light a user desires. In this manner, the driver provides accurate full range dimming without the need for calibration to specific AC power levels. The driver may detect the period of an AC signal allowing the driver to be used with various frequencies without the need for calibration. In one or more embodiments, the driver compares the pulse widths of a dimmed AC signal to the period of the AC signal to determine the desired light level. The driver may comprise a signal processor and controller in one or more embodiments.10-14-2010
20110254460LIGHT EMITTING CONTROL DEVICE AND METHOD THEREOF FOR LIGHT EMITTING DIODE PRINT HEAD - A light emitting control device for a light emitting diode print head includes a control unit, a pulse-mask unit, a strobe unit and a data output unit. The pulse-mask unit outputs n clock signals in sequence to a light emitting diode print head. The strobe unit outputs a strobe signal to the light emitting diode print head, so as to switch on the light emitting diode print head. The data output unit outputs a print data signal to the light emitting diode print head. When the pulse-mask unit outputs a k-th clock signal of the n clock signals, the pulse-mask unit delays the k-th clock signal for a predetermined time, and the data output unit pauses outputting the print data signal. After the predetermined time, the pulse-mask unit and the data output unit continue to output the rest of the clock signals and the print data signal.10-20-2011
20100117552Illumination Apparatus - An illumination apparatus includes an adapter configured to be inserted into an incandescent lamp socket; and a light emitting device illumination part that is coupled detachably and electrically to the adapter to emit light according to the driving power from the adapter. The incandescent lamp socket has a coupling groove, including an injection groove and a rotation groove. The adapter in configured to convert alternating power to driving power.05-13-2010
20110095697Method and Apparatus for Regulating the Brightness of Light-Emitting Diodes - Embodiments of the present invention relate to methods and circuits for brightness regulation for at least one light-emitting diode in the field of general lighting, more particularly, for incandescent lamp replacement by means of a supply voltage comprising a brightness level signal, wherein the brightness level signal contained in the supply voltage is decoded and converted into a modulation signal with a duty cycle corresponding to the brightness level signal for the purpose of driving a driver circuit for the at least one light-emitting diode.04-28-2011
20110095696DISCHARGE LAMP LIGHTING DEVICE, PROJECTOR, AND METHOD FOR DRIVING DISCHARGE LAMP - A discharge lamp lighting device includes: a DC power supply unit that outputs a DC current; an inverter that sequentially generates, from the DC current output from the DC power supply unit, a current pulse whose current direction alternately changes to supply the current pulse to a discharge lamp; and a control unit that controls operations of the DC power supply unit and the inverter to adjust a waveform of the current pulse to be supplied to the discharge lamp, wherein the control unit changes a pulse width of the current pulse every pulse.04-28-2011
20090179583DIGITALLY SYNCHRONIZED INTEGRATOR FOR NOISE REJECTION IN SYSTEM USING PWM DIMMING SIGNALS TO CONTROL BRIGHTNESS OF COLD CATHODE FLUORESCENT LAMP FOR BACKLIGHTING LIQUID CRYSTAL DISPLAY - An apparatus and method for controlling the operation of a utility device, such as a cold cathode fluorescent lamp that is powered in accordance with a pulse width modulation (PWM) signal, includes an analog sensor which monitors the utility device to derive an output signal representative of the PWM signal. An integrating analog-to-digital converter (ADC), which is coupled to the sensor and has its operation synchronized with an integral multiple of the period of the PWM signal, produces an output representative of an average of the output of the utility device.07-16-2009
20100026202Starting Apparatus for a High-Pressure Discharge Lamp, and a High-Pressure Discharge Lamp with a Starting Apparatus - A starting apparatus for a discharge lamp (02-04-2010
20100148690Super High Pressure Mercury Lamp - An extra-high pressure mercury lamp in which wear of an electrode is kept small even if a temperature of an electrode on the side of an opening portion of a reflector of an arc tube is increased to be higher than that of an electrode on the side of a neck portion of the reflector to generate a difference in temperature between both electrodes of the arc tube. The extra-high pressure mercury lamp is an extra-high pressure mercury lamp 06-17-2010
20120038288METHOD AND SYSTEM FOR EXTENDING PWM DIMMING RANGE IN LED DRIVERS - An apparatus for driving a light emitting diode (LED). A rising edge of a pulse width modulation (PWM) signal is first sensed. Upon sensing the rising edge, a threshold pulse (TP) signal is initiated that has a configured width started when the rising edge is sensed, an LED current with an amplitude at a previously set level is generated, and starting to charge a capacitor which yields a voltage Vcap. Subsequently, a falling edge of either the PWM signal or the TP signal is detected. Upon detecting the failing edge, the circuit stops charging the capacitor, samples, after a first delay from the detected falling edge, the voltage Vcap, and adjusts a level of the amplitude of the LED current based on the sampled voltage Vcap. When the falling edges of both the PWM and TP signal are detected, the LED current is terminated.02-16-2012
20120043907COMPACT HIGH BRIGHTNESS LED GROW LIGHT APPARATUS, USING AN EXTENDED POINT SOURCE LED ARRAY WITH LIGHT EMITTING DIODES - A compact high-brightness LED grow light fixture is described for use in growing plants under artificial light, or as a supplement to natural sunlight. The LED grow light uses a densely-packed array of high-brightness light emitting diodes (LEDs) that are not individually packaged where the array behaves similarly to a point source of light. The LED chips are distributed laterally over an area, where the LED chips have light emitting surfaces for emitting light in directions transverse to said area, wherein the dimensions of the area do not exceed 25 mm. Adjacent chips of the array are preferably separated by less than about 0.2 mm. The extended point source LED array, with its lens and associated reflector, result in a concentrated, partially-collimated light source, such that the intensity of the light does not diminish rapidly as distance from the light source increases. Thus, foliage that is lower down on the plant will receive almost as much light energy as does foliage on the top of the plant. The compact LED grow light does not block much of the natural sunlight, making the LED grow light suitable for use as a supplement to natural sunlight. The LED array contains a plurality of LED strings that may be separately controlled, thereby allowing the spectral content of the LED grow light to be varied, to facilitate desired plant growth at various stages of plant life. Multiple wavelengths of LEDs may be used within each LED string, thereby allowing the ability to further optimize the spectral content of the LED grow light. Due to the compact size of the LED grow light, the light emitted at each of the multiple different wavelengths from the array is evenly distributed, when the objects being illuminated by the array are at a distance of less than about 6 feet or even less than 1 foot from the array. Flexible mounting options allow for the use of multiple compact LED grow lights within a single plant growing area, and also allow for side or bottom lighting of plant foliage, in addition to the more typical overhead lighting.02-23-2012
20110316440METHOD AND APPARATUS FOR LED DIMMING - A dimmable LED driver provides accurate full range dimming for LED lighting. The driver utilizes the timing of an AC signal rather than its power output or other characteristics to accurately determine the level of light a user desires. In this manner, the driver provides accurate full range dimming without the need for calibration to specific AC power levels. The driver may detect the period of an AC signal allowing the driver to be used with various frequencies without the need for calibration. In one or more embodiments, the driver compares the pulse widths of a dimmed AC signal to the period of the AC signal to determine the desired light level. The driver may comprise a signal processor and controller in one or more embodiments.12-29-2011
20120025733DIMMING MULTIPLE LIGHTING DEVICES BY ALTERNATING ENERGY TRANSFER FROM A MAGNETIC STORAGE ELEMENT - A single magnetic storage element is used to provide power to multiple lighting devices, which may be strings of light-emitting diodes (LEDs) of different color. A switching circuit controls alternating application of energy among the multiple lighting devices and another switching circuit may charge the primary winding to different energy levels to control the intensity of the multiple lighting devices. In particular, the multiple lighting devices may be controlled to provide a desired color profile while dimming the lighting devices, while requiring only a single magnetic storage element for supplying energy to the lighting devices.02-02-2012
20100231137LIGHT SOURCE DRIVING APPARATUS - A light source driving apparatus is disclosed which includes a power supply including a power supply terminal connected to a first path through which a power source is supplied to a light source and including a feedback terminal for receiving a feedback of the power source supplied to the light source, a feedback resistor connected to the feedback terminal, and a current divider for branching a current flowing into the first path and supplying the branched current to the feedback resistor.09-16-2010
20100213865Pulse Width Modulation Control Device - The present invention relates to a pulse-width modulation (PWM) control device, especially to a PWM control device for use with a TRIode for an Alternating Current (TRIAC) dimmer. The PWM control device is comprised of a load, a rectifier, a PWM control module and a PWM controllable ballast. The load may be a gas discharge lamp, a motor, a heating device or a light emitting diode lamp. The rectifier is connected to a power module and rectifies a truncated sinusoidal voltage from the power module to a pulsating truncated direct current (DC) voltage. The PWM control module is connected to the power module and the rectifier and generates a PWM control signal. The PWM controllable ballast is driven by a boost circuit and is controlled by the PWM control signal that limits current to a proper value for the load.08-26-2010
20120153859DRIVING CIRCUIT FOR DRIVING LIGHT EMITTING DIODES AND SIGNAL-EXTENDING CIRCUIT APPLIED TO A DRIVING CIRCUIT FOR DRIVING LIGHT EMITTING DIODES - A driving circuit for driving light emitting diodes includes a signal-extending circuit and a current sink. The signal-extending circuit is used for receiving an original dimming signal and extending a duty cycle of the original dimming signal. The current sink is coupled to the signal-extending circuit for generating a driving current for driving a series of light emitting diode.06-21-2012
20120249011LIGHT SOURCE DEVICE, PROJECTOR, AND DRIVING METHOD OF DISCHARGE LAMP - To prevent biased consumption of electrodes in a discharge lamp and to prevent biased precipitation of the electrode material, a light source is provided. The light source device has a discharge lamp that emits light by discharge between a first electrode and a second electrode; and a driver that supplies alternating current to the first and the second electrodes so as to maintain the discharge, and changes duty ratio of the alternating current in accordance with predetermined pattern. The predetermined pattern includes a plurality of section periods for which the duty ratio maintains mutually different values for a predetermined period.10-04-2012
20100052560COLOR TUNABLE LIGHT SOURCE - A color tunable light source comprising: a first LED arrangement operable to emit light of a first color and a second LED arrangement operable to emit light of a second color, the LED arrangements being configured such that their combined light comprises the output of the source and control means operable to control the color of light emitted by the source by controlling the relative light outputs of the two LED arrangements wherein the control means is operable to dynamically switch the outputs of the LED arrangements and the color is tunable by controlling a duty cycle of the drive current. One or both LED arrangements can comprise at least one phosphor and an associated LED that is operable to irradiate the phosphor with excitation radiation of a first wavelength range such that the phosphor emits light of a different wavelength range.03-04-2010
20120313546HIGH PRESSURE DISCHARGE LAMP LIGHTING DEVICE - To maintain the shape of the projection on the electrodes of the tip end for a long time to extend the lifetime of a discharge lamp, a lighting device lighting a high pressure discharge lamp supplies alternating current such that an alternating current with a basic frequency at the time of the steady state lighting selected from a range between 60 and 1000 Hz and a low frequency of a half cycle with a frequency lower than the basic frequency are generated alternatingly. The alternating current is supplied such that the waveform with one polarity of the low frequency appears consecutively at least twice. It is also possible for the alternately generated low frequency to be lower than the basic frequency in a range from 5 to 200 Hz, and for the interval during which the basic frequency is supplied to be gradually increased and decreased at specified times.12-13-2012
20120256558Dimmer for Light Emitting Diodes and Fluorescent Bulbs - A dimmer system for a luminaire is provided. The dimmer system has a dimmer that receives a first current and supplies a reduced-magnitude current. The dimmer system also has a boosting system that receives the reduced-magnitude current and supplies a boosted current to a light source or lamp if the reduced-magnitude current is being received in conjunction with the initial turn-on of the dimmer. The boosted current can be provided for a predetermined period of time. The boosted current can also be provided as pulses of boosted current interspersed with pulses of the reduced-magnitude current. The boosted current can have the magnitude of the first current or range from 70% to 100% of the first current.10-11-2012
20120299506VARIABLE OUTPUT MODULE AND METHOD FOR ELECTRICAL SIGNAL OUTPUT - A variable output module provides accurate full range dimming or adjustment of power output. The variable output module utilizes the characteristics of an AC or other periodic signal rather than its power output to accurately determine the level of dimming a user desires. In this manner, the variable output module provides accurate full range dimming without the need for calibration to specific AC signals. The variable output module can detect the period of an AC signal allowing the driver to be used with various frequencies without the need for calibration. In one or more embodiments, the driver compares the pulse widths of a dimmed AC signal to the period of the AC signal to determine the desired level of dimming.11-29-2012
20110121746HIGH-PRESSURE DISCHARGE LAMP LIGHTING DEVICE, HIGH-PRESSURE DISCHARGE LAMP UTILIZING THE SAME, PROJECTOR UTILIZING SAID HIGH-PRESSURE DISCHARGE LAMP, AND HIGH-PRESSURE DISCHARGE LAMP LIGHTING METHOD - A first waveform (a rectangular waveform, for example) is applied as the waveform of the alternating current supplied to a high-pressure discharge lamp for a predetermined time from the beginning of lighting of the lamp and a second waveform (a staircase waveform, for example) is applied as the waveform of the alternating current after the elapse of a predetermined time (100 [s], for example). The alternating current with the first waveform has a lower absolute instantaneous value in a final section of each half-cycle period thereof than in the other sections and the alternating current with the second waveform has a higher absolute instantaneous value in a final section of each half-cycle period thereof than in the other sections.05-26-2011
20110037407LED LIGHT EMITTING DEVICE - The present invention relates to an LED light emitting device. An LED light emitting device includes a plurality of LED channels including a plurality of LEDs. The LED light emitting device further includes a transformer configured to convert an input voltage and supply an output voltage to the plurality of LED channels, a controller, and an LED driver. The controller controls the transformer according to a first feedback signal for interrupting power supply to the plurality of LED channels when a dimming off state in which currents are not supplied to the plurality of LED channels occurs or when a state in which the maximum channel voltage of a plurality of channel voltages corresponding to voltages applied to the plurality of LED channels, respectively, is an overvoltage and a defective state in which the plurality of LED channels include an open state are maintained during a predetermined threshold period. The LED driver generates information on the dimming off state and information on the defective state. Further, the LED driver is connected to a secondary side of the transformer, the controller is connected to a primary side of the transformer insulated from the secondary side, and the first feedback signal is generated according to the information on the dimming off state and the information on the defective state.02-17-2011
20110227500Multi-Mode Portable Lighting Device - A portable lighting device, such as a flashlight, with a mechanical power switch and multiple operating modes is provided. The mechanical power switch is disposed in series with the controller for the lighting device and acts as the user interface to the controller to change modes of operation. Because the mechanical power switch is in series with the controller, the portable lighting device does not consume battery power when the mechanical switch is open. A state machine coupled to the controller is polled by the controller each time it is powered up to determine the operational mode of the lighting device. A regulating circuit is used to power a controller and light source. The regulating circuit converts between current regulation and voltage regulation.09-22-2011
20110241560APPARATUS FOR GENERATING A DRIVE SIGNAL FOR A LAMP DEVICE AND METHOD FOR GENERATING A DRIVE SIGNAL FOR A LAMP DEVICE - An apparatus for generating a drive signal for a lamp device comprises a pulse generator for generating a first pulse train in response to a first brightness request for a first brightness and for generating a second pulse train in response to a second brightness request for a second brightness. The first pulse train has a first frequency and the second pulse train has a different second frequency. The second pulse train comprises two neighboring pulses of the first pulse train and comprises a further pulse between the two neighboring pulses, the further pulse not being comprised in the first pulse train.10-06-2011
20120326622COMPUTING DEVICE WITH COLOR ORGAN - A computing device includes an audio signal processing unit, a light module, and driving circuits. The audio signal processing unit decompresses digital audio data into an audio signal. The driving circuit drives the light module to light according to the audio signal, in such a manner that the intensity/brightness of the light module corresponds to amplitude of the audio signal in real-time.12-27-2012
20130009566BOOSTER CIRCUIT AND DISPLAY DEVICE - A display device includes a display panel having scan lines, and a booster circuit configured to generate an output voltage and to supply the output voltage as power source to the display panel. The booster circuit includes a charge pump and a feedback circuit section configured to control a booster operation of the charge pump depending on the output voltage. A mode of the booster operation includes a charge mode that charges the output capacitor and a discharge mode that discharges the output capacitor. The mode is switched depending on the output voltage. The feedback circuit section includes a booster operation control section configured to secure a period during which the mode is not switched between the charge mode and the discharge mode in accordance with an external synchronizing signal. The period includes a timing at which an active scan line is switched among the plurality of scan lines.01-10-2013
20130169186Multiple Location Load Control System - A multiple location load control system comprises a main device and remote devices, which do not require neutral connections, but allow for visual and audible feedback at the main device and the remote devices. The main device and the remote devices are adapted to be coupled in series electrical connection between an AC power source and an electrical load, and to be further coupled together via an accessory wiring. The remote devices can be wired on the line side and the load side of the load control system, such that the main device is wired “in the middle” of the load control system. The main device is operable to enable a charging path to allow the remote devices to charge power supplies through the accessory wiring during a first time period of a half-cycle of the AC power source. The main device and the remote devices are operable to communicate with each other via the accessory wiring during a second time period of the half-cycle.07-04-2013
20130113389LIGHTING DEVICE INCLUDING A DRIVE DEVICE CONFIGURED FOR DIMMING LIGHT-EMITTING DIODES - A lighting device with a drive device for dimming light-emitting diodes. The drive device comprises a dimming component that operates a switch in response to both a change in an input power signal and a system temperature. In one example, the dimming device can include a waveform generator that generates a signal with a waveform having levels that change in response to changes in temperature. The waveform defines the time during which the switch is open and closed, thereby determining the period of time the LEDs are energized. By operating the LEDs in this manner, the drive device effectively dims the LEDs to reduce the operating temperature and cool the LEDs.05-09-2013
20110266967METHOD AND SYSTEM FOR DRIVING LED - The present invention discloses an LED driving method and an LED driving system, the method comprising: generating a PWM control signal with a PWM dimming signal; and controlling a PWM DC/DC converter with the PWM control signal, so as to generate a driving voltage of the LED.11-03-2011
20130127368DRIVING METHOD FOR DISCHARGE LAMP, DRIVING DEVICE FOR DISCHARGE LAMP, LIGHT SOURCE DEVICE, AND IMAGE DISPLAY APPARATUS - In at least one embodiment of the disclosure, a driving device for a discharge lamp includes an alternating current supply section and a frequency modulation section. The alternating current supply section supplies two electrodes of the discharge lamp with an alternating current. The alternating current comprises a plurality of modulation periods. The frequency modulation section modulates a frequency of the alternating current so as to provide a plurality of retentive periods within each of the modulation periods. Each retentive period has a constant frequency that is different from a frequency of its temporally adjacent retentive periods. The frequency modulation section lengthens a length of at least one of the retentive periods in the modulation period in response to a predetermined condition occurring. The frequency of at least one of the retentive periods is equal to or higher than a predetermined reference frequency.05-23-2013
20130141005ELECTRONIC DEVICE AND CONTROL METHOD THEREFOR - In an electronic device including a discharge lamp, and a lamp power supply section that supplies power to the discharge lamp, a control section makes the lamp power supply section execute a lamp refresh process of supplying power necessary for generation of a halogen cycle to the discharge lamp at predetermined time intervals during low power operation in which the discharge lamp is lighted with power less than the rated power. Further, the control section records, in a recording section (non-volatile memory), a control instruction which is issued to the lamp power supply section during low power operation.06-06-2013
20090212713PULSE-MODULATION-SIGNAL GENERATING DEVICE, LIGHT-SOURCE DEVICE, AND OPTICAL SCANNING DEVICE - A high-frequency clock generating circuit generates a plurality of high-frequency clock signals having different phases. A modulation-signal generating circuit generates a pulse modulation signal based on transition timing data including data pertaining to a turn-on timing at which a state of a light source is changed from a turn-off state to a turn-on state and a turn-off timing at which the state of the light source is changed from the turn-on state to the turn-off state by inputting any one of the high-frequency clock signals for a predetermined period including the turn-on timing and the turn-off timing.08-27-2009
20100295464ILLUMINATING DEVICE - An illuminating device comprising semiconductor light-emitting devices employing a semiconductor light-emitting element, wherein outputted light is stably combined, separation of light is inhibited, and color tone is variable. Control for operating the light-emitting devices is as simple as possible. It is an illuminating device comprising a light-emitting part comprising a plurality of kinds of semiconductor light-emitting devices which differ in emission color are integrated and arranged, the semiconductor light-emitting devices comprising a semiconductor light-emitting element and a phosphor, and wherein the semiconductor light-emitting devices emit light outward on the basis of an emission from the semiconductor light-emitting element and an emission from the phosphor which is excited by said emission from the semiconductor light-emitting element to fluoresce or on the basis of an emission from the phosphor which is excited by an emission from the semiconductor light-emitting element to fluoresce, wherein the semiconductor light-emitting devices each have an emission color, the deviation duv of which from a blackbody radiation locus being within a range of −0.02≦duv≦0.02, in the uv chromaticity diagram according to UCS (u,v) color system (CIE 1960), and outputted lights from the light-emitting part in which the plurality of kinds of the semiconductor light-emitting devices are integrated and arranged, are mixed together and emitted outward.11-25-2010
20100308744LED Controlling Driver And Controlling Method Thereof - The present invention discloses a LED controlling driver comprising light emitting diodes and a detection-control module and a power supply unit in addition to the light source. The detection-control module includes a power/blinking control unit and a LED driver IC. The power supply unit outputs power to the light source and the detection-control module and provides different switching information so that the LED drive unit of the detection-control module is controlled by power/blinking control signals. Further, a power switch enables the power supply unit to output the corresponding switching information to the detection-control module based on switching actions inputted by a user so that the user only needs to simply switch the power switch to achieve the goal of switching power levels or blinking states of the LED.12-09-2010
20110234115LED DRIVE CIRCUIT, LED ILLUMINATION FIXTURE, LED ILLUMINATION DEVICE, AND LED ILLUMINATION SYSTEM - An LED drive circuit in which an alternating voltage is input and an LED is driven, and which can be connected to a phase control dimmer The LED drive circuit is provided with an edge detector for detecting an edge of the output voltage of the phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to the LED; wherein the value of the current extracted from the current feed line by the current extractor is varied in accordance with the detection results of the edge detector.09-29-2011
20130154504DIMMING AND CONTROL ARRANGEMENT AND METHOD FOR SOLID STATE LAMPS - A system and method are disclosed for dimming light emitting diode (LED) lamps. A control unit is coupled to a dimmer and LED lamp. The dimmer receives power from an AC source and determines a phase angle of the AC power. The dimmer provides DC power to the lamp based on the phase angle. The control unit sends a control signal to the dimmer during a first portion of each half sine-wave of the received AC power. The control signal causes the dimmer to modify at least one function of the lamp. A plurality of LED lamps may be associated with a single dimmer, and the dimmer may individually instruct the lamps to modify their operational characteristics. The dimmer may send an operational signal back to the control unit. The operational signal may represent end of life information for the associated LED lamp. Other embodiments are described and claimed.06-20-2013
20110298389DISCHARGE LAMP LIGHTING APPARATUS AND DISCHARGE LAMP LIGHTING METHOD - A discharge lamp lighting apparatus of the present invention comprises: a power supply section for supplying a discharge lamp voltage prescribed in accordance with the characteristic of the discharge lamp; an inverter for inversely converting the discharge lamp voltage supplied by the power supply section into an AC voltage to be applied to the discharge lamp; and a control section for controlling the discharge lamp voltage in the power supply section and a drive frequency in the inverter, based on the AC voltage applied to the discharge lamp and an AC current flowing in the discharge lamp. The control section controls the discharge lamp voltage in the power supply section and the drive frequency in the inverter such that the AC current flowing in the discharge lamp becomes a square wave having a high-frequency block that is a high-frequency interval, and a low-frequency block that is a low-frequency interval, and that the square wave has spikes so as to make the current value (absolute value) of the AC current as it is just before the polarity of the AC current inverts larger than the current value (absolute value) as it is just after the polarity inverts.12-08-2011
20110309767LIGHT-EMITTING ELEMENT DRIVE DEVICE - A light-emitting element drive device capable of expanding a dimming range of a light-emitting element, enabling a constant minimum dimmed luminance to be obtained irrespective of individual differences between devices. A burst signal generating circuit 12-22-2011
20110309766REMOTE CONTROL AND ADJUSTMENT APPARATUS DISPOSED IN AN ENERGY SAVING LIGHTING APPARATUS AND A CONTROL SYSTEM OF THE SAME - The present invention provides a remote control and adjustment apparatus disposed in an energy saving lighting apparatus and a control system of the same. The remote control and adjustment apparatus of the invention includes a RF wireless transceiver, a processing module and a power module. The wireless transceiver can receive a first signal from a remote controller. The processing module can receive the first signal from the wireless transceiver, and generate a second signal or generate and send a third signal according to the first signal. Particularly, the second signal includes at least a control parameter, and the processing module can control the energy saving lighting apparatus operating based on the control parameter. Additionally, the power module can provide electric power for the operation of the remote control and adjustment apparatus.12-22-2011
20130187563DIMMING DEVICE AND LIGHTING SYSTEM - According to one embodiment, a control section receives supply of control power from a control power supply section through a capacitive element and divides, a period of each half cycle of an alternating-current voltage into a first section, a second section, and a third section. In the first section, the control section subjects a switch section to conduction control to supply electric power to a load and stops a converting action of the control power supply section. In the second section, the control section subjects the switch section to non-conduction control to interrupt the power supply to the load and stops the converting action of the control power supply section. In the third section, the control section subjects the switch section to the non-conduction control to interrupt the power supply to the load and causes the converting action of the control power supply to operate.07-25-2013
20120286695ELECTRIC SUPPLY DEVICE - An electric supply device for a high-pressure discharge lamp comprising: an electric supply device control unit, having a function of switching between a steady lighting mode and a low power lighting mode in which electric power lower than the electric power in the steady lighting mode is supplied to the high pressure discharge lamp. While in the low power lighting mode, predetermined base current is continuously supplied to the high pressure discharge lamp and a current supply command signal is sent so that boost current obtained by superimposing current having a predetermined magnitude on the base current, is periodically supplied thereto, and a luminance control signal for adjusting the luminance of a video signal of the liquid crystal projector apparatus according to a magnitude of the electric power of the high pressure discharge lamp, which is operated responding to the supply of the boost current, is sent.11-15-2012
20120086354GENERATION FROM PHASE CUT DIMMER OUTPUT WITH FAST RESPONSE TO CHANGES IN DIMMER POSITION - A circuit for a dimmer system is disclosed, in which a phase-cut dimmer output signal is converted to a dimming control level signal. The phase-cut dimmer output signal is used to generated a pulse modulated signal indicative of the duty cycle of the phase cut dimmer output signal, and the pulse modulated signal is directly converted to a piece-wise linear dimming control level signal. By directly converting the pulse modulated signal to a piece-wise linear dimming control level signal, no further processing is necessary to produce a dimming signal which closely resembles the ideal logarithmic response of the human eye.04-12-2012
20130207568LIGHT SOURCE DEVICE, PROJECTOR, AND METHOD OF DRIVING DISCHARGE LAMP - A light source device includes a discharge lamp having a light emitting case and a pair of electrodes, a drive device, a voltage detector, and a time measurement device, the drive device alternately repeats a first alternating current supply interval and a second alternating current supply interval, measures a period of the first and the second alternating current supply interval with the time measurement device, performs a change from the first alternating current supply interval to the second alternating current supply interval when the period of the first alternating current supply interval reaches a predetermined period A, and performs a change from the second alternating current supply interval to the first alternating current supply interval when the period of the second alternating current supply interval reaches a predetermined period B, or when an absolute value of an inter-electrode voltage of the pair of electrodes reaches a threshold value.08-15-2013

Patent applications in class Periodic-type current and/or voltage regulator in the supply circuit