Class / Patent application number | Description | Number of patent applications / Date published |
315185000 | Christmas lights | 21 |
20080224622 | Multicolor light-emitting diode light string and light-emitting diode component thereof - A multicolor light-emitting diode (LED) light string includes multiple serially connected LED components. Each LED component includes multiple chips and multiple pairs of positive and negative pins. The pairs of the positive and negative pins are respectively and electrically connected to positive and a negative poles of the corresponding LED chip. Further, the LED chips with the same light color are serially connected through the positive and negative pins. In this way, the LED light string can be driven by different voltage sources at different times to show different light colors. | 09-18-2008 |
20080231201 | LED LIGHTING FIXTURE - A light-emitting diode (LED) lighting fixture is provided as a potential solid state lighting (SSL) replacement fixture for a conventional HID lamp fixture. The LED lighting fixture includes a main housing having a bottom surface supporting an array of LEDs, a top surface and sides, and at least one driver provided in a side housing attached to a side of the main housing to drive the LED array. The thickness of the side housing is equal to or greater than the thickness of the main housing. A plurality of heat spreading fins is arranged on the top surface of the main housing. | 09-25-2008 |
20080231202 | LED Light String with Half-wave Rectifying and Filtering Device - The invention relates to a decorative light and more particularly, relates to an LED light string with a half-wave rectifying and filtering device. The light string includes a plug, a power line and an LED light string having a plurality of LED lamps, these LED lamps sharing the same polarization direction. The LED light string further includes a half-wave rectifying and filtering device disposed between pins of the plug and the LED light string. The light string of the invention benefits from low cost, reduced volume of itself, convenience, and a longer life span. In addition, it can be used needless of a special controller and without generating twinkling. | 09-25-2008 |
20080246408 | EL lamp driver with plural outputs - A driver for electroluminescent (EL) lamps is an integrated circuit that includes a first transistor, a second transistor, and an inductor connected in series between the first transistor and the second transistor. The driver also includes at least four output circuits coupled to said inductor for separately driving at least four electroluminescent lamps. The driver further includes memory for storing data representing dimming levels and device addresses. Data is communicated to the driver through a serial interface that recognizes at least one standard protocol. | 10-09-2008 |
20080258636 | LED DRIVER WITH CURRENT SINK CONTROL AND APPLICATIONS OF THE SAME G - A backlight system for use in an LCD display with a driver providing current sink control includes an LED array module, a current feedback circuit, and a current compensation circuit. The LED array module has N columns of LEDs and each LED column has M LEDs connected in serial, wherein the current feedback circuit includes N current feedback units and the current compensation circuit includes N current compensation units, both of the current feedback circuit and the current compensation circuit being electrically coupled to the LED array module. When the backlight system is in operation, a current passes through an LED column, a current feedback unit, and a current compensation unit to generate an output voltage that is used for comparison with a predetermined DC voltage, and the current is compensated based on the results of the comparison. | 10-23-2008 |
20080258637 | LIGHT EMITTING ELEMENT DRIVER AND CONTROL METHOD THEREFOR - A method of controlling a light emitting element to compensate for reduced brightness includes accumulating a power-on time of the light emitting element and adjusting a light emitting element driving signal in order to adjust the power supplied to the light emitting element dependent on the power-on time of the light emitting element. | 10-23-2008 |
20080265789 | LIGHT EMITTING DIODE LAMP - LED lamp, light comprising an LED lamp, method for operating a light and method for generating an electrical dissipation power in association with an LED lamp | 10-30-2008 |
20080284343 | LIGHT EMITTING DIODE LAMP, LIGHT EMITTING DIODE ASSEMBLY, AND LIGHT EMITTING DIODE STRING - An exemplary light emitting diode (LED) lamp is provided. The LED lamp includes a base, an encapsulation, a circuit carrier, a first LED chip, a second LED chip, a first electrode, and a second electrode. The base and the encapsulation cooperatively define a sealed space. The circuit board, along with the first and the second LED chips carried thereon, are received in the sealed space. The first and the second LED chips are electrically connected to the circuit board. The first LED chip is electrically connected with the second LED chip in anti-parallel. The first and the second electrodes are electrically connected to the circuit board so as to supply power to the first and the second LED chips. A LED assembly and a LED string, both employing the aforementioned LED lamp therein, also are provided. | 11-20-2008 |
20080297058 | Method, apparatus, and system for driving LED's - A method and apparatus for driving LED's is disclosed, comprising the steps of receiving a desired intensity value, wherein the desired intensity value represents the desired intensity for the LED's; generating a first switching control signal, wherein the first switching control signal is a pulse width modulated signal whose duty cycle is based on the desired intensity value; switching the LED's on and off based on the first switching control signal, wherein the switching takes place when the desired intensity value is less than a first desired intensity value threshold; generating a desired constant current value based on the desired intensity value, wherein the desired constant current value represents the value of the desired constant current to drive the LED's; determining an actual constant current value, wherein the actual constant current value represents the value of the actual constant current driving the LED's; comparing the actual constant current value with the desired constant current value; and adjusting the output of the primary drive of the LED's so that the actual constant current value is equal to the desired constant current value. A system for providing LED backlighting of a display is also disclosed, comprising a first constant current source driver, wherein the constant current source driver comprises a primary drive and a step-up circuit; a first series connection of LED's, wherein the LED's are driven by the first constant current driver; and wherein the first constant current source provides a forward voltage of 42 volts or greater to drive the first series connection of LED's. | 12-04-2008 |
20080297059 | Led Control Circuit and Method - A LED control circuit for controlling the activation scheme of a plurality of LED light sources in an in-vivo swallowable imaging capsule is presented, which is designed for efficient operation and for flexible and changeable modes of operation. | 12-04-2008 |
20080303446 | LAMP SYSTEM - A lamp system including a bulb assembly, a socket assembly, and a conductor base assembly is provided. The bulb assembly includes an insulation object, a first bulb pin, and a second bulb pin. The socket assembly includes an outer housing, a first conductive terminal, and a second conductive terminal. The outer housing includes an opening to install the bulb assembly. The conductor base assembly includes a conductor. The conductor base assembly is an element manufactured independently and should be placed within the socket assembly. When the bulb assembly is not installed in the socket assembly, the two ends of the conductor contact the conductive terminals, respectively. When the bulb assembly is installed in the socket assembly, the insulation object on the bottom of the bulb assembly insulates the terminals from the conductor. The conductive terminals contact the bulb pins, respectively. | 12-11-2008 |
20080315776 | Traffic signal lights showing dynamic patterns, particularly as are interposed on continuous illumination - A traffic control signal light presents (1) a first, constant, light emission preferably from arrayed first LED light sources, in accompaniment with (2) a second light emission that is in any of time, hue, pitch (frequency), chroma and, most preferably, space, preferably from arrayed second LED light sources interspersed with the first LED light sources. The variable second light emission is preferably 8-10 Hz, and may cause Brücke-Bartley phenomenon, making that the composite light stimulates the combined human visual and nervous systems, and is all but impossible to miss or to ignore. | 12-25-2008 |
20090015169 | Method for Driving an LED - A method for driving a light emitting diode (LED), which is operated at a prescribed constant driving voltage and a prescribed constant driving current such that the prescribed power consumption of the LED in a prescribed unit of time is the prescribed constant driving voltage times the prescribed constant driving current, comprises the step of supplying the LED with a driving pulse signal at a cycle equal to the prescribed unit of time, the driving pulse signal having a peak value equal to n times of current value of the prescribed constant driving current and a high voltage level duration of T/n′, wherein T is the prescribed unit of time, n and n′ both are positive integer excluding 0 and 1, and n/n′≦1, thereby the intensity of the light emitted from the LED can be increased by n times while the power consumption is kept unchanged. | 01-15-2009 |
20090015170 | Method for Driving LED - A method for driving a LED and to an illumination system comprising at least one LED. The LED is driven by a pulse signal, wherein the pulse signal comprises pulses of a duration of T/n, wherein T is the duration of a single pulse and the corresponding pause in between two consecutive pulses and n is at least 2, and the current value of the pulses is at least double as much as the nominal constant current of said LED. The light intensity is increased by n times while the power consumption is the same in comparison to driving that LED with a prescribed constant driving voltage and the prescribed constant driving current. | 01-15-2009 |
20090079352 | Organic Light Emitting Device and Method for Manufacturing the Same - Disclosed is an organic light emitting device and a method of manufacturing the same. The organic light emitting device includes a base rod, and a plurality of organic light emitting units. Each of the plurality of organic light emitting units includes a first electrode formed on the base rod, an organic layer formed on the first electrode, and a second electrode formed on the organic layer. The plurality of organic light emitting units are formed in longitudinal direction of the base rod and come into continuous contact with each other. The first electrode of each of the organic light emitting units comes into contact with the second electrode of each of the organic light emitting units adjoining said first electrode of each of the organic light emitting units. | 03-26-2009 |
20090091265 | BACKLIGHT ASSEMBLY AND DISPLAY DEVICE HAVING THE SAME - A backlight assembly a plurality of first light-emitting chips for emitting light and a thermistor for indicating the temperature of the first light-emitting chips. The first light-emitting chips emit first color light and are connected in series to each other. The thermistor may be connected in series to the first light-emitting chips and has an electrical resistance that decreases with an increase of its temperature. The light amount emitted by the first light-emitting chips is controlled by pulse width modulating the current driving the first light-emitting chips based on the temperature (resistance) of the thermistor and based on received image data. Thus, a decrease in brightness due to temperature variation may be compensated for while performing color dimming. | 04-09-2009 |
20090128045 | Electronic Circuits for Driving Series Connected Light Emitting Diode Strings - Electronic circuits provide an error signal to control a regulated output voltage signal generated by a controllable DC-DC converter for driving one or more series connected strings of light emitting diodes. | 05-21-2009 |
20090167197 | Driver and method for driving LEDS on multiple branch circuits - Techniques pertaining to driving LEDs on multiple branches of a circuit are disclosed. According to one aspect of the present invention, an LED drive circuit includes a boost circuit configured for receiving an input voltage and providing an output voltage according to a control signal, a selector configured for alternatively selecting one of the feedback signals as an output feedback signal and switching on a corresponding branch circuit, and a pulse-width modulation (PWM) controller configured for generating a pulse-width modulation signal as the control signal for the boost circuit according to the output feedback signal of the selector, essentially to match respective currents in the multiple branches. | 07-02-2009 |
20090206762 | LED Light String with Split Bridge Rectifier and Thermistor Fuse - A string of lights has an electrical plug at one end and a receptacle at the other end and plural light-emitting diodes (LEDs) in series with a negative temperature coefficient (NTC) thermistor. The device also includes a bridge rectifier providing direct current to the LEDs and the thermistor but split between the plug and receptacle of the light string so that alternating current from the plug is delivered to the receptacle but direct current flow through the LEDs. Light string fuses protect the string but the NTC fuses protect the LEDs at a lower current rating. The LEDs can be arranged in a simple electrical series, or, in an alternative embodiment, an electrical series of groups of plural LEDs each of which is arranged electrically in parallel with other LEDs of the same group. The use of the lower-current-rating NTC thermistor allows the LEDs in one light string to fail without necessarily jeopardizing the current flow to subsequent light strings unless the current is high enough to blow the light string fuses in the plug. | 08-20-2009 |
20090218952 | COLOR-CHANGING LIGHT STRING - A color-changing light string comprises a plurality of color-changing luminous bodies connected in series, driven by a rectifier circuit and controlled by a control switch, so that each of the luminous bodies in the light string can emit lights of various colors individually, making the entire light string sparkle with vibrant and different colors and effectively enhancing visual effects of the light string as is not seen in conventional light strings. | 09-03-2009 |
20090261742 | LED ASSEMBLY AND AN IMPROVED POWER SUPPLY CIRCUIT THEREOF - An LED device comprises an LED assembly and a power supply circuit. The power supply circuit includes an AC circuit connecting to the power source, a DC circuit coupling with the AC circuit, a driving circuit and a snubber circuit connected with each other and located between the DC circuit and the LED assembly. The locations of the driving circuit and the snubber circuit in the power supply circuit are exchangeable, i.e., the driving circuit being connected to the DC circuit and the snubber circuit being connected to the LED assembly, or the driving circuit being connected to the LED assembly and the snubber circuit being connected to the DC circuit. The snubber circuit is used for extending a time period for a voltage value of a DC initially applied to the LED assembly to increase from zero to a predetermined value. | 10-22-2009 |
20090267527 | System For Supplying In-Series Connected Light Sources - A supply system for light sources connected in series is powered by one power line (SE), and a plurality of adjustment units (UR | 10-29-2009 |
20090273288 | LED DRIVER WITH DYNAMIC POWER MANAGEMENT - A light emitting diode (LED) system implements a LED driver to drive a set of one or more LED strings. The LED driver includes a voltage source to provide an adjustable output voltage to a head end of each LED string of the set for a first duration and a second duration following the first duration. The LED driver further includes a feedback controller to control the voltage source to adjust the output voltage for the second duration based on a digital code value generated from a minimum tail voltage of one or more tail voltages of the set at a sample point of the first duration. The LED driver further includes a power controller to temporarily enable one or more components of the feedback controller for a sample period of the first duration, the sample period comprising the sample point. | 11-05-2009 |
20090289559 | LED DEVICE AND LED DRIVER - A LED device having a LED array, LED driver ICs, DC-DC converter, a first feedback circuit consisting of voltage dividing resistors, and a headroom voltage monitoring circuit having controller and second feedback circuit. In second feedback circuit, headroom voltages obtained at output current terminals of the LED driver ICs, are fed back to DC-DC converter. | 11-26-2009 |
20090295298 | LIGHT SOURCE DRIVING CIRCUIT - A light source driving circuit includes a power supply circuit, a first dimming circuit, and a control circuit. The power supply circuit has a control terminal and an output terminal that is connected to a terminal of a first light-emitting element. The first dimming circuit has a first terminal connected to the other terminal of the first light-emitting element, a second terminal connected to a common potential, and a pulse width signal input terminal. The control circuit is connected between the pulse width input terminal of the first dimming circuit and the control terminal of the power supply circuit. The first dimming circuit determines an ON/OFF state according to a logic state of the pulse width signal. The power supply circuit determines whether or not to output the voltage. The control circuit delays the power supply circuit, turns off the power supply circuit, and delays the first dimming circuit. | 12-03-2009 |
20090302770 | Circuit for compensating thermal variations, lamp, lighting module and method for operating the same - A circuit for adjusting and for at least partially compensating, respectively, thermal variations is provided, where a current source is connected to a temperature compensation unit, where the temperature compensation unit at least partially compensates thermal variations of the current source, wherein the temperature compensation unit has at least one device having a temperature coefficient, in particular having a negative temperature coefficient. Further a lighting module or a lamp may have such a circuit as well as a method for operating the circuit and/or the lamp and the lighting modules, respectively. | 12-10-2009 |
20090315467 | APPARATUS AND METHODOLOGY FOR ENHANCING EFFICIENCY OF A POWER DISTRIBUTION SYSTEM HAVING POWER FACTOR CORRECTION CAPABILITY BY USING A SELF-CALIBRATING CONTROLLER - The present invention relates to circuits and methods for controlling one or more LED strings. The circuit comprises a programmable controller coupled to one or more detectors, wherein the one or more detectors are configured to detect one or more measurable parameters of one or more LEDs or LED drivers. The controller is configured to receive information from the one or more detectors related to the one or more measurable parameters and use that information to determine the desired drive voltage for the LED strings. The controller is associated with a power supply having power factor correction (PFC) capability. The controller provides the power supply with a control signal indicative of the desired drive voltage for one or more LED strings. The power supply also receives ac voltage and current waveforms as inputs and performs power factor correction and rectified waveforms related to the ac waveforms. The power supply generates the desired drive voltage based on the control signal. | 12-24-2009 |
20090322235 | LED DRIVING CIRCUIT, LED DRIVING CONTROL UNIT AND TRANSISTOR SWITCH MODULE THEREOF - An LED driving circuit is used for dimming by switching between an operating current and a maintaining current or by voltage clamping of a source/drain of MOSFET that is coupled to the LED module. When the LED module is dimmed off, the voltage across the LED module can be kept at a value around a lighting threshold voltage of the LED module that is a minimum voltage for lighting the LED module. Therefore, a voltage difference between the drain and the source of MOSFET coupled to the LED module is smaller than that in the conventional arts. Hence, a withstand voltage of MOSFET can be reduced, and cost of the LED driving circuit as well as the power consumption of MOSFET can be lessened, thereby improving integral efficiency of the circuit. | 12-31-2009 |
20100013395 | DYNAMIC HEADROOM CONTROL FOR LCD DRIVER - An LED driver controller comprises a voltage regulator for controlling an output voltage to a top of a plurality of LED strings responsive to at least a reference voltage. A plurality of first circuitries each associated with a node at a bottom of each of the plurality of LED strings compares a voltage at the bottom of each of the plurality of LED strings with a high reference voltage and a low reference voltage. Control logic generates a first control signal when the voltage at the bottom of each node of the plurality of LED strings exceeds the high reference voltage and generates a second control signal when the voltage at least one of node of the plurality of LED strings falls below the low reference voltage. Second circuitry responsive to the first control signal and the second control signal generates the reference voltage. The reference voltage is controlled to cause the voltage at the bottom of the lowest voltage node of the plurality of LED strings to remain between the high reference voltage and the low reference voltage. | 01-21-2010 |
20100019681 | ELECTRONIC DEVICE FOR DRIVING LED STRINGS - The present invention relates to an electronic device for driving at least a first channel (CHA) and a second channel (CHB) of light emitting diodes (LED). The electronic device includes driving means having a first and a second driving portion for driving the first and the second channel (CHA, CHB) of light emitting diodes separately, and configuration | 01-28-2010 |
20100039037 | Light Emitting Diode Driving Apparatus - A light emitting diode driving apparatus includes: a switching converter having an inductor and a switching device; a plurality of serial light emitting diode lines each having a plurality of light emitting diodes connected in series; a plurality of rectifier diodes respectively connected in series to the plurality of serial light emitting diode lines; a plurality of capacitors respectively connected to nodes between the serial light emitting diode lines and the rectifier diodes for smoothing a voltage; and one or more current distribution coils disposed between the switching converter and the plurality of serial light emitting diode lines to let a current flow in a direction of canceling out a magnetic flux generated by a first winding and a magnetic flux generated by a second winding each other, thereby making currents flowing in the serial light emitting diode lines equal to each other. | 02-18-2010 |
20100045193 | ORGANIC ELECTROLUMINESCENT LIGHT EMITTING DEVICE FOR RESTORING NORMAL OPERATION AFTER LOW-VOLTAGE ERRORS - Provision of a light emitting device having functionality for restoring to normal even if a low-voltage error occurs, by temporarily applying a reverse current to a low-voltage error light emitting element using a direction inverting circuit, and repairing portions in which impedance has fallen by applying the current. | 02-25-2010 |
20100045194 | POWERING AND CONTROLLING LIGHT EMITTING DIODES VIA THERMALLY SEPARATED ARRAYS OF DISSIPATIVE ACTIVE ELEMENTS - A chipset for powering and controlling a plurality of light emitting diode (LED) strings. The chipset includes a controller having a pulse width modulating (PWM) functionality and a data transfer interface circuitry; and at least one dissipative active element array comprising a plurality of dissipative active elements. The dissipative active element array(s) are packaged to be thermally separate from the controller. The PWM functionality is arranged to individually pulse width modulate a current flow through each of the LED strings. Each of the plurality of dissipative active elements is associated with a particular one of the plurality of LED strings and is arranged to limit the current flow of the pulse width modulated current that flows through the particular LED string to a value, the value being responsive to a value output by the controller via the data transfer interface circuitry. | 02-25-2010 |
20100052552 | APPARATUS FOR LIGHTING LEDS - An apparatus for lighting LEDs includes an LED group load having the LEDs, a converter to generate a voltage applied to the LED group load, a current controller to control a current of the LED group load, a voltage controller to control an output voltage provided by the converter, a time division circuit to intermittently pass a current through the LED group load, and a selector. The selector, during a period in which the time division circuit passes a current through the LED group load, selects the current controller to control a current of the LED group load and thereby control an output voltage provided by the converter, and during a period in which the time division circuit passes no current through the LED group load, selects the voltage controller to control an output voltage provided by the converter. | 03-04-2010 |
20100060177 | LOAD DRIVING APPARATUS - The load driving apparatus according to the present invention includes a load current setting signal generating section, a load current generating section, a reference voltage generating section and a drive voltage generating section. The load current setting signal generating section generates a desired load current setting signal. The load current generating section generates a load current based on the load current setting signal to drive the load. The reference voltage generating section generates a reference voltage based on the load current setting signal. The drive voltage generating section generates a drive voltage, supplies the drive voltage to the load, generates a between-both-terminals voltage between both terminals of the load current generating section based on the drive voltage and controls the drive voltage so that the difference between the between-both-terminals voltage and the reference voltage becomes small. | 03-11-2010 |
20100072903 | Color and Intensity Control Over Power Wires - A control element for a luminaire constituted of a first and a second manually variable non-momentary impedance and a first and a second time dependent gating circuit, each responsive to a respective manually variable non-momentary impedance and operative to provide a time dependent gating of a respective polarity of an alternating current power signal, the amount of time of the gating reflecting the present value of the respective manually variable non-momentary impedance, wherein the first time dependent gating circuit and the second time dependent gating circuit are restrained to maintain a minimum predetermined power towards the solid state lighting unit. | 03-25-2010 |
20100072904 | AIRCRAFT LED WASHLIGHT SYSTEM AND METHOD FOR CONTROLLING SAME - A modular area washlight illumination system and method for operating are providing that comprises an intelligent light module group that has: one or more light modules, each of which comprises a plurality of discrete illumination sources; a power supply; and an intelligent module group controller comprising: a) circuitry that controls the illumination levels of the illumination sources; and b) an interface for receiving and sending information. The system further comprises a system controller that comprises: a) an attendant control panel serving as a user interface; and b) a system controller interface that is connected to the module group controller interface. | 03-25-2010 |
20100084983 | LED driving circuit - An LED driving circuit is provided for driving an LED module, comprising a transistor switch and a feedback controller. The transistor switch has a control terminal, a first terminal, and a second terminal. The first terminal is coupled to the LED module and the control terminal receives a control signal for controlling a current passing through the transistor switch. The feedback controller receives a reference voltage and a current detecting signal indicative of the magnitude of the current and generates the control signal accordingly. The feedback controller is connected to a driving power source with level higher than the level of the first terminal of the transistor switch. Hence, the maximum level of an adjustable range of the control signal is higher than the first terminal of the transistor switch. | 04-08-2010 |
20100096999 | LIMITED FLICKER LIGHT EMITTING DIODE STRING - A limited flicker decorative light-emitting diode (LED) string includes a power plug adapted to connect to an alternating current (AC) power source and supply AC power to the LED string, a first pair of LEDs and a second pair of LEDs, a plurality of LEDs electrically connected in series to form an LED series, and a plurality of rectifying diodes. The plurality of rectifying diodes provides full-wave rectification of the AC power to the LED series and half-wave rectification of the AC power to the first and second pair of LEDs. | 04-22-2010 |
20100102733 | LED LIGHT STRING - A light emitting diode light string has a front plug, a rear socket and an LED assembly. The front plug has a first end, a second end and a resistor being mounted inside the front plug and connected to the first end. The rear socket has a first end and a second end. The LED assembly is electrically connected between the resistor and the second end of the rear socket and has multiple LEDs being connected in serial. Plastic package materials for sealing resistors are unnecessary. Therefore cost of manufacturing the LED light string is low. | 04-29-2010 |
20100102734 | LIGHT EMITTING DIODE DRIVER AND METHOD - Disclosed is a method and apparatus for controlling a plurality of Light Emitting Diodes (LEDs). A communications protocol is also provided, which comprises a START code, a first Command packet and at least one subsequent Command packet. An LED driver receives a signal according to the protocol, and separates the first Command packet from the signal and controls an LED associated with the LED driver in accordance with instructions in the first Command packet. The LED driver then outputs the remaining signal for use by one or more subsequent LED drivers. | 04-29-2010 |
20100109537 | LED LIGHTING CIRCUIT AND ILLUMINATING APPARATUS USING THE SAME - Light outputs from many LEDs are uniformized and power consumption required for such uniformizing is suppressed, in an LED lighting circuit to be used for illuminating apparatus and the like. Currents flowing from a DD converter to an LED module are detected by a current detection resistor and compared with a reference voltage (Vref) from a reference voltage source by a comparison circuit. Corresponding to the comparison results, a control circuit controls the DD converter, and the currents flowing to the LED module are controlled to be constant currents at the same time. Furthermore, in LED load circuits configuring the LED module, control elements configuring a current mirror circuit are arranged in series, a corresponding control element is permitted to have a diode structure by having a circuit with the highest sum of the LED ON voltages as a reference, the flowing current values of the control elements of the remaining circuits are interlocked, and the LED load circuits are balanced. | 05-06-2010 |
20100109538 | CONTINUOUS CURRENT CONTROL CIRCUIT MODULES OF SERIES STRING BULBS TYPE - The invention relates to a continuous current control circuit module of series string bulbs type, which can maintain the normal current and voltage across each of the bulbs when any of series connected bulbs burn out. The string includes a shunt in every bulb assemblies, which is especially a Zener diode with a tiny volume. The shunt will thus provide a secure electrical connection of the light string whenever any bulb is burn out or broken. | 05-06-2010 |
20100134024 | LED THERMAL MANAGEMENT SYSTEM AND METHOD - A thermal management system for reducing or eliminating heat-mediated degradation of LED performance and/or operating life. The system may include a thermal controller arranged to respond to an LED operating condition, and to responsively limit temperature in the LED. The thermal controller in one implementation includes a bypass circuit containing a bypass control element, such as a varistor, Zener diode, or antifuse device, and arranged to divert current from flowing to the LED so that the LED remains in a cool state, e.g., below 75° C. The system may be arranged to (I) at least partially attenuate the power supplied to an LED so as to reduce heat generation in such LED and maintain the LED below a threshold temperature and/or (II) remove heat from the LED to maintain temperature of the LED below a threshold temperature. | 06-03-2010 |
20100134025 | LED curtain - An LED curtain includes a plurality of transparent hollow tubes parallelly connected side by side to form an integral unit and serve as a basic curtain body; a plurality of light-emitting strings, each of which includes a plurality of serially connected light-emitting diodes (LEDs) sequentially disposed in each of the hollow tubes; and a light controller internally provided with a circuit board, from which a plurality of signal lines is extended to separately connect to the light-emitting strings. Multiple pieces of the LED curtain can be hung to a track via a plurality of hooks provided at upper ends of the light-emitting strings. By operating the light controller to control the LEDs, different patterns or animations can be displayed on the curtain via the light-emitting strings, and different brightness of LEDs can be regulated to illuminate a room or create a special atmosphere. | 06-03-2010 |
20100134026 | LIGHT EMITTING DIODE DEVICE - A light emitting diode (LED) device comprises a base and a cover packaging of a rectifier diode chip and a light emitting diode chip connecting in series with a metal wire. The LED device can be plugged directly into the socket of the LED light string without any other external rectifier circuits. Moreover, the device has advantages of small size, easy-to-use and easy-to-change. By adopting different connection methods with the LED device, it can achieve anticipative functions, such as half-wave, full-wave and bridge rectifier, etc. | 06-03-2010 |
20100141159 | LED DRIVING CIRCUIT AND CONTROLLER WITH TEMPERATURE COMPENSATION THEREOF - The present invention provides an LED driving circuit with temperature compensation, comprising a power transforming circuit, an LED module and a controller. The transforming circuit receives an electrical power from an input power source and transforms it into an output voltage according to a control signal. The LED module is coupled to the transforming circuit. The controller generates the control signal according to an operation temperature and a voltage feedback signal indicative of the output voltage, and makes the output voltage decrease with increasing operation temperature. Therefore, the LED driving circuit of the present invention has an effect of temperature compensation that compensates the influence of the decreased driving voltage of the LED module due to temperature. | 06-10-2010 |
20100141160 | TRACKING REGULATOR FOR LED LOAD AND POWER REGULATION METHOD THEREOF - A tracking regulator for a plurality of light emitting diode (LED) loads is provided. The tracking regulator includes a power supply and a control circuit coupled to the power supply. The power supply provides a power signal to each of the LED loads according to a control signal, wherein each of the LED loads provides an output signal according to the power signal. The control circuit detects the output signals from the LED loads to generate the control signal, so as to control the power supply to adjust the power signal. | 06-10-2010 |
20100148679 | CURRENT-BALANCE CIRCUIT AND BACKLIGHT MODULE HAVING THE SAME - The present invention relates to a current-balance circuit and a backlight module having the same. The current balance circuit includes a current balance unit, a control unit, and a detection unit. The current balance unit is connected to a plurality of light units to regulate the current of the plurality of light units, independent from the effects of input voltage. The detection unit is connected to the plurality of light units and the current balance unit to detect the minimum operating voltage for the plurality of light units. The control unit, connected to the current balance unit, controls the operation of the plurality of light units. | 06-17-2010 |
20100156304 | LIGHTING CONTROL SYSTEM HAVING A TRIM CIRCUIT - A lighting control system suitable for a surgical lighting device. The lighting control system includes circuitry that compensates for the effects of temperature changes in a lighting device, and that compensates for forward voltage variations among LED lighting modules to provide substantially uniform light output. | 06-24-2010 |
20100176734 | Method and device for driving light-emitting diodes of an illumination device - A method for driving series-connected light-emitting diodes of an illumination device, in particular an illumination device for film, video and photographic recordings with a pulse-width-modulation of the light-emitting diode current, is provided. In the method the pulse-width-modulated light-emitting diode current is detected and a current sensor signal is derived and fed to a microprocessor, which outputs a drive signal for the pulse-width-modulation and for the setting of the light-emitting diode voltage applied to the light-emitting diodes, depending on the detected current sensor signal. The current-time integral of the pulse-width-modulated light-emitting diode current flowing through the light-emitting diodes is determined and a controllable voltage source for setting the light-emitting diode voltage is driven in such a way that a predetermined pulse-width-modulated light-emitting diode current flows through the light-emitting diodes. | 07-15-2010 |
20100181923 | SELF-POWERED LED BYPASS-SWITCH CONFIGURATION - A LED string is divided into segments that each have a bypass-switch and a driver for the bypass-switch. The driver is powered by a supply voltage locally generated from the forward-voltages of the LEDs of the segment. | 07-22-2010 |
20100194296 | LED FLUORESCENT LAMP - Provided is a light-emitting diode (LED) fluorescent lamp using as light sources a plurality of LEDs, which are eco-friendly and can contribute to power conservation. The LED fluorescent lamp includes an LED array including a plurality of LEDs connected in series; first through fourth connection pins; first through fourth capacitors connected to the first through fourth connection pins, respectively; a first diode having an anode connected to a second end of the first capacitor and a cathode connected to a first end of the LED array; a second diode having an anode connected to a second end of the LED array and a cathode connected to a second end of the second capacitor; a third diode having an anode connected to the second end of the LED array and a cathode connected to a second end of the third capacitor; and a fourth diode having an anode connected to a second end of the fourth capacitor and a cathode connected commonly to the first end of the LED array and the cathode of the first diode. The LED fluorescent lamp can be readily used in various types of fluorescent lamp ballasts without a requirement of the installation of additional equipment or the change of wiring. | 08-05-2010 |
20100201278 | SERIAL CONFIGURATION FOR DYNAMIC POWER CONTROL IN LED DISPLAYS - A power management technique in a light emitting diode (LED) system is disclosed. The LED system includes a plurality of LED driver connected in series, each LED driver configured to regulate the current flowing through a corresponding subset of a plurality of LED strings. Each LED driver determines the minimum tail voltage of the LED strings of the corresponding subset, compares the determined minimum tail voltage with an indicator of a minimum tail voltage of one or more other subsets provided from an upstream LED driver in the series, and then provides an indicator of the lower of the two tail voltages to the downstream LED driver. In this manner an indicator of the minimum tail voltage of the plurality of LED strings is cascaded through the series. A feedback controller monitors the minimum tail voltage represented by the cascaded indicator and accordingly adjusts an output voltage provided to the head ends of the plurality of LED strings. | 08-12-2010 |
20100201279 | SERIAL CASCADE OF MINIMIUM TAIL VOLTAGES OF SUBSETS OF LED STRINGS FOR DYNAMIC POWER CONTROL IN LED DISPLAYS - A light emitting diode (LED) system implements a power management technique. The LED system includes a plurality of LED drivers connected in series, each LED driver configured to regulate the current flowing through a corresponding subset of a plurality of LED strings. Each LED driver determines the tail voltages of the one or more LED strings of the corresponding subset. Each LED driver, except for the first LED driver in the series, also receives a voltage representative of the minimum tail voltage of the other subsets regulated by the upstream LED drivers. Each LED driver then provides the lowest of the voltage received from the upstream LED driver and the one or more tail voltages of the corresponding subset to the downstream LED driver. In this manner a voltage representative of the minimum tail voltage of the plurality of LED strings is cascaded through the series. A feedback controller monitors the minimum tail voltage represented by this cascaded voltage and accordingly adjusts an output voltage provided to the head ends of the plurality of LED strings. | 08-12-2010 |
20100207533 | Light string with alternate LED lamps and incandescent lamps - In one embodiment an electrical circuit for use as a string of lights includes a load comprising a plurality of lamps connected in series, the lamps comprising a first group of lamps including an LED and a first Zener diode in parallel therewith, and a second group of lamps including an incandescent light bulb and a second Zener diode in parallel therewith; and a rectifier for converting a source of AC into DC which is supplied to the load. The first group of lamps are alternate with the second group of lamps. | 08-19-2010 |
20100231133 | APPARATUS FOR CONTROLLING SERIES-CONNECTED LIGHT EMITTING DIODES - An apparatus for controlling an LED-based lighting system includes a comparison circuit configured to compare at least one signal representative of a supply voltage with at least one other signal representative of a series voltage drop over at least some of a plurality of LEDs connected electrically in series. The apparatus includes a controller, connected to the comparison circuit; and a power section connected to the controller. The power section is configured to operate at least one switch such that the number of LEDs operated in series may be changed in response to the comparison circuit. | 09-16-2010 |
20100237786 | METHOD AND APPARATUS FOR AN INTELLIGENT LIGHT EMITTING DIODE DRIVER HAVING POWER FACTOR CORRECTION CAPABILITY - The present invention relates to circuits and methods for controlling one or more LED strings. The circuit comprises a programmable controller coupled to one or more detectors, wherein the one or more detectors are configured to detect one or more measurable parameters of one or more LEDs or LED drivers. The controller is configured to receive information from the one or more detectors related to the one or more measurable parameters and use that information to determine the desired drive voltage for the LED strings. The controller is associated with a power supply having power factor correction (PFC) capability. The controller provides the power supply with a control signal indicative of the desired drive voltage for one or more LED strings. The power supply also receives ac voltage and current waveforms as inputs and performs power factor correction and rectified waveforms related to the ac waveforms. The power supply generates the desired drive voltage based on the control signal. | 09-23-2010 |
20100237787 | PROCESS AND CIRCUITRY FOR CONTROLLING A LOAD - A current source and an associated method for supplying current to a load such as an arrangement of LEDs. The intensity of the supplied current varies as a function of the temperature of the load. The intensity of the current is temperature-dependent and limited to a predefined maximum. The temperature dependence is achieved by the component parts that are used without the help of special temperature sensors. The current source is supplied with a reference voltage derived from an integrated circuit. The reference voltage is tapped from a port of the IC and therefore it is switchable. The reference voltage is used to produce a control current, which is fed through a driver stage to produce the current of the current source. Elements in the current source limit the current's intensity and change it as a function of temperature. | 09-23-2010 |
20100244711 | Self-Calibrating White Light Emitting Diode Module - The self-calibrating WLED module in accordance with the present invention providing precisely matched current outputs by matching each output current to a reference current, wherein matching a current output to a current reference is done sequentially for a number of current outputs, restarting at a first current output after the last has been matched to the reference current. The module may be implemented with components that comprise multiple WLED strings, a controller, a transconductance amplifier, an input voltage, a generator, a reference module and multiple current regulators. The current regulators provide required current respectively to WLED strings by varying the current through the WLED strings. | 09-30-2010 |
20100244712 | LIGHT STRING WITH EXTERNAL RESISTOR UNIT - An LED light string including a first loop, which further includes a first plurality of LEDs in series successively connected by first connecting wires, and at least one first resistor connected to two first resistor wires, the first two resistor wires removably connected to two of the first connecting wires in any portion of the first loop. | 09-30-2010 |
20100259177 | LED DRIVER WITH EXTENDED DIMMING RANGE AND METHOD FOR ACHIEVING THE SAME - A circuit for powering of a Light Emitting Diode (LED) string has a switching power converter. A brightness control circuit is coupled to the switching power converter to allow a duration of a conductive state of the power converter to exceed a duration of a conductive state of the LED string for maintaining a current magnitude in the LED string constant. | 10-14-2010 |
20100264836 | LIGHTING ASSEMBLY, CIRCUITS AND METHODS - A circuit in accordance with one embodiment of the invention can include an LED drive circuit that may isolate a sense circuit from a supply voltage in a passive mode, and maintain a predetermined voltage difference between the sense circuit and the supply voltage in an operational mode. | 10-21-2010 |
20100270935 | LIGHT-EMITTING DEVICE AND ILLUMINATION APPARATUS - A light-emitting device and an illumination apparatus are disclosed. A plurality of LED elements are connected in series between positive and negative lines, and first bypass capacitor is connected in parallel to the LED elements respectively. Each series circuit of a predetermined number of LED elements is connected in parallel to second bypass capacitors. As a result, with the negative power line set as a grounding point, the AC impedance at connection points of the series circuit of the LED elements against the ground is reduced. Thus, the erroneous lighting or “flicker” of each LED which otherwise might be caused by an external noise is prevented. | 10-28-2010 |
20100277083 | LIGHTING DEVICE - According to one embodiment, a lighting device includes a device board, a rectification device connected to a commercial power supply, a series LED circuit, and a transistor (current limiter) which limits a maximum current flowing through the series LED circuit. The series circuit mounted on the device board is configured by connecting in series a plurality of LED elements. Each of the LED elements lights when an output voltage of the rectification device is applied to the series circuit. A number of LED elements included in the series circuit is set in a manner that a voltage applied to the series LED circuit is 70 to 90% of the output voltage of the rectification device. | 11-04-2010 |
20100283396 | LIGHT SOURCE SYSTEM AND LIGHT SOURCE DRIVING CIRCUIT - A light source driving circuit includes a plurality of light-emitting loads, an operational amplifier, a plurality of transistors, an isolation circuit, and a reference circuit. The first ends of each transistor are electrically connected to the plurality of light-emitting loads respectively. The second end of each transistor is electrically connected to a current mirror. The control end of each transistor is electrically connected to the output end of the operational amplifier. The isolation circuit is electrically connected between the negative input end of the operational amplifier and the plurality of transistors. | 11-11-2010 |
20100289415 | Energy efficient decorative lighting - Energy efficient system for lighting is provided that allows variation of length, density of illumination and positioning. The inventive system is particularly suitable for decorative lighting and seasonal display. The lighting system comprises at least one light string having a plurality of light emitting diodes (LEDS) interconnected to a parallel set of power wires maintaining output voltage within a prescribed range. A direct current (DC) transformer is connected to the parallel set of power wires to convert alternating current (AC) input to DC output to control power to the lighting system at relatively low voltage level and less than about fifteen watts. Multiple LED light strings may be connected to the parallel set of power wires to provide decorative lighting displays of desired length, configuration and density of illumination. Accordingly, the unique system provides decorative lighting that is energy efficient and suitable for low cost manufacture compared with conventional incandescent light strings. | 11-18-2010 |
20100295458 | AC LED MODULE WITH AN IMPROVED POWER FACTOR - An AC LED module with an improved power factor for coupling with an AC source includes a plurality of LED strings and a plurality of connecting-to-middle drive elements. The LED strings are coupled in parallel between two ends of the AC source, and each of the LED strings further includes a respective number of LEDs connected in series. The connecting-to-middle drive element assigned to a respective LED string has two connection point, one connected to one end of the AC source while another being connected with a middle point between two consecutive LEDs in the same LED string. | 11-25-2010 |
20100295459 | CIRCUIT ARRANGEMENT FOR OPERATING A SERIES CIRCUIT OF AT LEAST TWO LOW-PRESSURE GAS-DISCHARGE LAMPS, AND A CORRESPONDING METHOD - In various embodiments, a circuit arrangement for operating a series circuit of a first and a second low-pressure gas-discharge lamp is provided, which may include an input with a first and a second input connection for application of a supply voltage; an output with a first arrangement, which has a first and a second connection pair for connection of the first lamp, and a second arrangement, which has a first and a second connection pair for connection of the second lamp, wherein a first connection of the second pair of the first arrangement is coupled to a first connection of the first pair of the second arrangement; a resonant circuit; and a capacitive voltage divider, which has a first capacitor, which is coupled in parallel with the first arrangement, and a second capacitor, which is coupled in parallel with the second arrangement. | 11-25-2010 |
20100301759 | RESTART CIRCUIT FOR MULTIPLE LAMP ELECTRONIC BALLAST - A restart circuit for causing an electronic ballast to perform a restart in response to reconnecting any lamp of a multiple lamp configuration of the electronic ballast to the electronic ballast is disclosed. The electronic ballast includes a filament health check circuit for providing a first current through a monitored filament of the lamps to a controller of the ballast. The controller restarts the electronic ballast when a determined ratio of the first current to a reference current indicates that the monitored filament has been disconnected or broken (i.e., the first current substantially decreases) and is subsequently replaced or reconnected to the ballast (i.e., the first current returns to a predetermined level). The ballast further comprises a dv/dt circuit for reducing the first current for a transient time period in response to reconnecting a filament other than the monitored filament to the ballast, causing the controller to restart the ballast. | 12-02-2010 |
20100308738 | Apparatus, Method and System for Providing AC Line Power to Lighting Devices - An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). An exemplary apparatus comprises: a plurality of LEDs coupled in series to form a first plurality of segments of LEDs; a plurality of switches coupled to the plurality of segments of LEDs to switch a selected segment into or out of a series LED current path in response to a control signal; a current sensor; and a controller which, in response to a first parameter and during a first part of an AC voltage interval, generates a first control signal to switch a corresponding segment of LEDs into the series LED current path; and during a second part of the AC voltage interval, generates a second control signal to switch a corresponding segment of LEDs out of the first series LED current path. | 12-09-2010 |
20100315012 | LIGHT EMITTING DEVICES AND SYSTEMS HAVING TUNABLE CHROMATICITY AND METHODS OF TUNING THE CHROMATICITY OF LIGHT EMITTING DEVICES AND SYSTEMS - A light emitting device package assembly includes a light emitting device package body, and first, second and third white light emitting devices on the package body, each of the first, second and third white light emitting devices emits light when energized having a chromaticity that falls within a respective one of first, second and third non-overlapping chromaticity regions in a two dimensional chromaticity space. The first, second and third chromaticity regions are spaced apart in the two dimensional chromaticity space by respective regions having at least the size of a seven step MacAdam ellipse. Related solid state luminaires and methods are also disclosed. | 12-16-2010 |
20100315013 | LED Current-Balance Driving Circuit - An LED current-balance driving circuit for driving a plurality of LED strings comprises a feedback transformer, a plurality of current-balance transformers, a plurality of full-wave rectifiers and a current control circuit. The feedback transformer has a detecting winding and an outputting winding for outputting a feedback signal. Each of the current-balance transformers has a primary winding and a secondary winding. The primary windings of the current-balance transformers and the detecting winding of the feedback transformer are coupled in series to compose a current-balance loop with an AC power being supplied thereto. Each of the full-wave rectifiers is coupled between a corresponding secondary winding of the current balance transformers and a corresponding LED string of the LED strings. The current control circuit receives the feedback signal and controls the AC power according to the feedback signal. | 12-16-2010 |
20100320920 | Decorative Lamp for Displaying Snowing or Water-Flowing Pattern - The present invention relates to a decorative lamp for displaying snowing and water-flowing pattern, comprising a rectification power supply, a controller and a lamp series section connected in sequence, wherein the lamp series section is composed of a plurality of LED strings connected in parallel or in series. The controller comprises an integrated circuit including a plurality of outputs and switch devices for controlling sequentially flashing of the LED strings. Each of the switch devices has two terminals electrically connected in series to a loop of the respective LED string. Each of the LED strings has respective terminal connected to a common terminal which is a direct current output terminal of the rectification power supply, the other terminal of the LED string is connected to the respective switch device. | 12-23-2010 |
20110001433 | LED LIGHT EMITTING DEVICE AND METHOD OF DRIVING THE SAME - An LED light emitting device and a method of driving the same are provided, and technology that can uniformly sustain the magnitude of a channel current flowing to a plurality of LED channels is disclosed. The LED light emitting device includes: a plurality of LED channels that are formed with a plurality of LED elements that are continuously connected in series; and a constant current source that controls each channel current flowing to the plurality of LED channels according to a predetermined channel reference current to be a predetermined setting channel current, wherein the constant current source includes a plurality of operating amplifiers that control the magnitude of each of the channel currents, and a feedback voltage generating according to a predetermined offset reference current is input to a second input terminal of an operating amplifier for an offset setting period that sets an offset voltage of the plurality of operating amplifiers, a reference voltage generating according to a channel reference current is input to a first input terminal of the operating amplifier, and an offset voltage of each of the plurality of operating amplifiers is set so that an actual channel current may be identical to a predetermined setting channel current. | 01-06-2011 |
20110006691 | VOLTAGE CONVERTER FOR SUPPLYING A SEMICONDUCTOR LIGHT SOURCE, IN PARTICULAR A LED LAMP - An embodiment of the invention relates to a voltage converter for supplying a semiconductor light source and having at least an input terminal connected to a power supply reference, namely an AC mains voltage reference, and an output terminal providing a current signal to said semiconductor light source, the converter being also connected to a voltage reference and comprising at least a step-down block inserted between a switching node and to the output terminal and connected to the voltage reference and an input block connected to the input terminal, as well as to a first input node and to a first output node of a control circuit, in turn connected to the switching node and to the voltage reference. The input block is a pre-regulator input block and comprises at least a switching component connected to the input terminal and to a capacitive block, in turn inserted between a second input node of the control circuit and the voltage reference, such a switching component having a control terminal connected to the first output node. | 01-13-2011 |
20110006692 | APPARATUS FOR DRIVING CAPACITIVE LIGHT EMITTING DEVICE - A capacitive light emitting device includes: a capacitive light emitting device | 01-13-2011 |
20110012519 | ANALOG-TO-DIGITAL CONVERTER WITH NON-UNIFORM ACCURACY - An analog-to-digital converter (ADC) implements non-uniform conversion accuracy so as to allow for high conversion accuracy for a select narrower input range while also accommodating a wider overall input range and requiring fewer conversion bits compared to conventional ADCs. The ADC includes an ADC core that receives an input signal and outputs a first digital value having a first number of bits, the first digital value based on the input signal and an accuracy configuration of the ADC core. The ADC also includes an encoder to generate a second digital value have a second number of bits, greater than the first number of bits, based on the first digital value and the accuracy configuration of the ADC core. The ADC further includes an accuracy controller to adjust the accuracy configuration of the ADC core based on a relationship between the first digital value and at least one threshold. | 01-20-2011 |
20110012520 | APPARATUS FOR DRIVING A LIGHT EMITTING DIODE - An apparatus for driving a light emitting diode (LED) comprises: an LED unit configured as a plurality of LEDs are serially connected to each other; a rated current providing unit connected to one end of the LED unit, for providing a current to the LED unit under control of a controller; a voltage dividing unit connected between another end of the LED unit and another end of the rated current providing unit; and a voltage measuring unit connected to the LED unit in parallel, for measuring a voltage applied to the LED unit. | 01-20-2011 |
20110018449 | AC LED device for avoiding harmonic current and flash - An AC LED device for avoiding harmonic current and flash includes an AC power input terminal, a first AC LED group and a second AC LED group. The AC power input terminal receives an AC power including a positive half-cycle and a negative half-cycle. The first AC LED group is turned on in the positive half-cycle and turned off in the negative half-cycle. The second AC LED group is turned on in the negative half-cycle and turned off in the positive half-cycle. Each of the first AC LED group and the second AC LED group has an overall on voltage with a value lower than a peak voltage value of the AC power by a predetermined value, and an overall peak inverse voltage with a value higher than the peak voltage value of the AC power, so as to increase power factor and avoid harmonic current, thereby effectively eliminating flash problems of the AC LED. | 01-27-2011 |
20110018450 | Light Source Driving Device Capable of Dynamically Keeping Constant Current Sink and Related Method - A light source driving device for driving a light emitting component is disclosed. The light source driving device includes a voltage converter coupled to the light emitting component for converting an input voltage into an output driving voltage according to a voltage control signal, a dimming unit coupled to the light emitting component for implementing a dimming process according to a dimming signal, a current source coupled to the dimming unit for providing a driving current to drive the light emitting component, and a control unit coupled to the dimming unit and the voltage converter for detecting a dimming state to generate a dimming detection signal and generating a reference voltage according to the dimming detection signal, wherein the control unit controls the voltage converter to generate the output driving voltage so as to driving the light emitting component. | 01-27-2011 |
20110018451 | Single Inductor Serial-Parallel LED Driver - An LED driver circuit is disclosed that can drive a plurality of LED strings that are arranged in parallel, each LED string having a plurality of component LEDs that are series-connected. The LED strings can be the same type of LEDs in each string, or have different types of LEDs from one string to another. The LED driver includes a voltage control loop that dynamically regulates the output voltage across the parallel arrangement of LED strings. The output voltage is dynamically adjusted to accommodate the LED string with the largest operational voltage drop. This enables LED displays to constructed using different types of LEDs strings, but still supply the LED strings in a power efficient manner. Further, each LED string also includes its own individual current regulation loop so that the current, and therefore brightness, of each LED string can be individually adjusted. | 01-27-2011 |
20110025212 | ELECTRONIC DEVICE INCLUDING AN ORGANIC DIODE AND A SHUNT AND A PROCESS OF FORMING THE SAME - An electronic device can include an organic diode and a shunt that allows a significant current to bypass the organic diode, wherein the shunt is separate from the organic diode. Alternatively, an electronic device can include an organic diode lying along a first conduction path. The electronic device can also include a resistive member lying along a second conduction path that is parallel to the first conduction path. In another aspect, a process of forming an electronic device can include forming a first conductive member, forming a resistive member over the first conductive member, and forming an organic semiconductor layer over the first conductive member. The process can also include forming a second conductive member over the resistive member and the organic semiconductor layer, such that the resistive member and the organic semiconductor layer lie along parallel conduction paths between the first and second conductive members. | 02-03-2011 |
20110025213 | WISDOM TECH LED CURRENT BALANCE ASSEMBLY - A wisdom tech LED current balance assembly comprises a DC current source connected with a bridge converter to convert DC current into AC current so as to be as an AC current source; a transformer series comprising at least one primary side and a plurality of secondary sides; the at least one primary side of the transformer series serially connected to the AC current source; and each secondary side being serially connected to a bank of LEDs which are connected in series. Only one PWM IC is used to balance a plurality of LED banks which are arranged in parallel. Furthermore, the whole circuit structure is simple without using balance MOSFET and thus heat dissipation is low. | 02-03-2011 |
20110025214 | Lighting system and control method thereof - A lighting system is provided. The lighting system includes a plurality of lamp modules connected in series, wherein each of the lamp modules includes a decoder and a lamp. When a first lamp module of the lamp modules receives a trigger signal, a first decoder of the first lamp module configures a first identification code for a first lamp of the first lamp module, and provides a configuring signal to a second decoder of a second lamp module of the lamp modules to configure a second identification code for a second lamp of the second lamp module. The second lamp module is a next lamp module following the first lamp module. | 02-03-2011 |
20110025215 | MULTICOLOR LED SEQUENCER - A multicolored LED luminaire module is provided that can be controlled using a single driver and only two wires. The LED luminaire module comprises a plurality of LEDs and a sequencer. The sequencer connects each LED to the circuit in a predetermined order. Synchronously with the sequencer, the driver transmits a control signal comprising a time division multiplexed (TDM) signal that combines the driving currents for each LED into one TDM signal. The sequencer and TDM rate are sufficiently fast such that the light emitted by the LED luminaire appears to be the combined light from all the LEDs. | 02-03-2011 |
20110037396 | LIGHT EMITTING DIODE MODULE AND DRIVING METHOD THEREOF - A light emitting diode module having a plurality of LED strings is provided. The light emitting diode module includes a voltage generating loop, a light tuner, a voltage selector, and a voltage storage and comparison circuit. The voltage generating loop generates a system voltage according to a pulse modulation control signal. The light tuner receives a light tuning signal and turns on or off the LED strings accordingly. The voltage selector selects one of terminal voltages of terminals of the LED strings coupled to the light tuner for generating a selection voltage. The voltage storage and comparison circuit generates an error voltage by comparing the selection voltage and a reference voltage. The voltage storage and comparison circuit stores the error voltage temporarily and provides the temporarily stored error voltage as the pulse modulation control signal. | 02-17-2011 |
20110037397 | LIGHT EMITTING ELEMENT WITH A PLURALITY OF CELLS BONDED, METHOD OF MANUFACTURING THE SAME, AND LIGHT EMITTING DEVICE USING THE SAME - The present invention relates to a light emitting element with arrayed cells, a method of manufacturing the same, and a light emitting device using the same. The present invention provides a light emitting element including a light emitting cell block with a plurality of light emitting cells connected in series or parallel on a single substrate, and a method of manufacturing the same, wherein each of the plurality of light emitting cells includes an N-type semiconductor layer and a P-type semiconductor layer, and the N-type semiconductor layer of one light emitting cell is electrically connected to the P-type semiconductor layer of another adjacent light emitting cell. Further, the present invention provides a light emitting device including a light emitting element with a plurality of light emitting cells connected in series. Accordingly, it is possible to simplify a manufacturing process of a light emitting device for illumination capable of being used with a household AC power source, to decrease a fraction defective occurring in manufacturing a light emitting device for illumination, and to mass-produce the light emitting device for illumination. Further, there is an advantage in that DC driving efficiency can be enhanced in an AC operation by installing a predetermined rectifying circuit outside the light emitting element. | 02-17-2011 |
20110043118 | LIGHT-EMITTING DIODE BACKLIGHTING SYSTEMS - Lighting system embodiments are provided to energize and calibrate strings of light-emitting diodes. These embodiments are particularly useful for calibration of strings of light-emitting diodes that are arranged to provide backlighting of liquid crystal displays. The systems are structured around the use of a single comparator that is multiplexed to facilitate calibration of a plurality of current sources. The systems can be adapted for use in displays in which different techniques (e.g., “analog dimming” and “pulse-width modulation”) are used to vary the brightness of the display. The systems remove the need for special structures (e.g., fuse arrays, special test equipment, and interfaces). | 02-24-2011 |
20110050109 | REVERSE POLARITY SERIES TYPE LED AND DRIVE CIRCUIT - The present invention of a reverse polarity series type LED is formed by two sets of LED and diode assemblies in reverse polarity series connection wherein the first set is consisted of at least one or multiple homopolar series or parallel connected or series and parallel connected LED's, and the second set consisting of at least one or more homopolar parallel or series connected or series and parallel connected LED's for further connection to the drive circuit formed by current-limiting impedance and/or power storage and discharging devices and/or voltage-limit circuit devices in order to produce the required operational characteristics. | 03-03-2011 |
20110050110 | APPARATUS AND METHOD OF DRIVING LED, SYSTEM FOR DRIVING LED USING THE SAME, AND LIQUID CRYSTAL DISPLAY APPARATUS INCLUDING THE SYSTEM - The light emitting diode (LED) driving apparatus includes a channel driving unit configured to detect a pulse width of a pulse width modulation (PWM) signal, and configured to output n dimming signals, where n is a natural number greater than or equal to 2. The channel driving unit is configured to sequentially shift a phase of the PWM signal by as much as the detected pulse width to generate the n dimming signals, and configured to output the n dimming signals to n channels. | 03-03-2011 |
20110050111 | LIGHT SOURCE DEVICE - A light source device which is used as the backlight device and does not generate sound is provided. One or more flat substrates each having a light emitting element on its surface side are supported by a chassis having a conductive flat plate surface so that back surfaces of the substrates are opposed to the flat plate surface. The substrate comprises first wiring conductive thin films on a surface side of an insulation substrate, and one or more second radiating or wiring conductive thin films on a back surface side of the insulation substrate. Two terminals of the light emitting element are connected to the two adjacent first conductive thin films. A potential of at least one of the second conductive thin films is fixed to have a constant potential difference or preferably fixed to the same potential with respect to that of the flat plate surface of the chassis. | 03-03-2011 |
20110050112 | FLICKERING CANDLE LED LIGHTING - A series-wired LED light string with flickering candle LED's. The LED's in the light string can be of the standard steady bum type or of the flickering type resembling a candle flame or the string can include a combination of both types as shown in FIG. | 03-03-2011 |
20110057572 | Voltage regulating devices in LED lamps with multiple power sources - LED driver circuits containing voltage reducing devices, voltage regulating devices, and voltage converting devices are disclosed as the main components to provide power to LEDs. The LED driver circuits are designed to work with a ballast, mains alternating current voltage, direct current voltage, and electromagnetic induction power. The voltage regulating devices can be a resistor in series with at least one zener diode or a voltage regulator both in parallel with and providing power to the LEDs. The LEDs can also be anti-parallel diode pairs consisting of one diode and one LED or two LEDs, or the LEDs can be anti-parallel diode string pairs consisting of diodes and LEDs or all LEDs. The LED driver circuits will be incorporated into LED replacement lamps, and in particular to LED lamps to replace fluorescent lamps for use with existing ballasts and other power sources where the ballast may be removed or bypassed. | 03-10-2011 |
20110057573 | LED BALLAST POWER SUPPLY HAVING DIGITAL CONTROLLER - A power supply for an LED lamp has a set of coupled coils, primary-side power circuitry including a converter power switch for conducting input power, and secondary-side power circuitry including a dimming power switch. Power control circuitry includes converter control circuitry which generates a converter control signal for the converter power switch to maintain a desired undimmed level of lamp current at a normal operating value of a lamp voltage. Dimming control circuitry generates a dimming control signal for the dimming power switch to pulse-width modulate the lamp current at a duty cycle corresponding to a desired dimming. Operation of the converter control circuitry is modified during dimming to prevent an automatic increase of the lamp voltage in response to a decrease in lamp current, avoiding undesirable overshooting of the lamp current and providing more accurate and effective control over dimming operation. | 03-10-2011 |
20110068700 | Method and apparatus for driving multiple LED devices - A series of methods of driving multiple LED devices with high efficiency balancing technique is disclosed. The regulation of the LED current is accomplished by switching operation to compensate the difference of the LED operating voltage. Reactive components are also employed to construct non-dissipative balancing networks to drive multiple LED strings with low losses. Additionally, a series of concept is presented to drive the LED devices from PFC voltage directly with low cost circuit architecture. | 03-24-2011 |
20110068701 | SOLID STATE LIGHTING APPARATUS WITH COMPENSATION BYPASS CIRCUITS AND METHODS OF OPERATION THEREOF - A lighting apparatus includes a string of serially-connected light emitting devices and a bypass circuit coupled to first and second nodes of the string and configured to variably conduct a bypass current around at least one of the light-emitting devices responsive to a temperature and/or a total current in the string. In some embodiments, the bypass circuit includes a variable resistance circuit coupled to the first and second nodes of the string and configured to variably conduct the bypass current around the at least one of the light-emitting devices responsive to a control voltage applied to a control node and a compensation circuit coupled to the control node and configured to vary the control voltage responsive to a temperature and/or total string current. | 03-24-2011 |
20110084617 | High reliability and long lifetime AC LED device - A high reliability and long lifetime AC LED device includes: an LED group, a rectifier diode group and an AC power. The LED group includes a plurality of LED micro-chips connected in series. The rectifier diode group includes four rectifier diodes. The AC power is electrically connected to the rectifier diode group, and the rectifier diode group is electrically connected to the LED group. The AC power includes a positive half-cycle voltage and a negative half-cycle voltage. The rectifier diode group enables the LED group to conduct both in positive and negative half-cycle voltage, so as to prevent the LED group from bearing high reverse bias voltage, and extend the light-emitting lifetime and enhance the reliability. | 04-14-2011 |
20110084618 | LED DRIVING CIRCUIT HAVING A LARGE OPERATIONAL RANGE IN VOLTAGE - An LED driving circuit includes a current selecting circuit. The current selecting circuit controls the current transmission path in the plurality of LEDs according to respective threshold voltages of corresponding LEDs and a plurality of current limits. | 04-14-2011 |
20110084619 | Light Emitting Diode Selection Circuit - The present invention relates to a Light Emitting Diode (LED) selection circuit for an LED driver that drives multiple unequal lengths of LED strings, which selectively turns the LED strings ON and OFF corresponding to an input alternating current (AC) line voltage. The LED driver provides optimal efficiency as input AC line voltage varies from low to high voltages (i.e. 90V to 150V for nominal 120 VAC operation and 190V to 250V for nominal 220 VAC operation). Thus The LED driver can be used internationally since it accepts voltages from virtually every industrialized country in the world. The LED selection circuit in accordance with the present invention comprises a rectifier, multiple LED strings, multiple current sources and a controller. The controller generates multiple signals to the corresponding current source and turns ON and OFF the LED strings. | 04-14-2011 |
20110101873 | LIGHTING DISPLAY HAVING ANIMATED EFFECT - A decorative lighting display including at least one string of lighting elements positioned within a display housing having a plurality of distinct regions, and wherein, when the lighting display is activated, one or more lighting elements positioned in a first region of the housing intermittingly illuminate a first portion of the display and one or more lighting elements positioned in a second region intermittingly illuminate a second portion of the display, the intermittent illumination of the first and second portions of the display cooperating to produce a dynamic or animated visual effect. | 05-05-2011 |
20110101874 | METHOD OF DRIVING LIGHT SOURCE AND DISPLAY APPARATUS FOR PERFORMING THE METHOD - A method of driving a light source apparatus includes inverting a direct current voltage to generate a first alternating current voltage, transforming the first alternating current voltage into a second alternating current voltage having a voltage level that is greater than a voltage level of the first alternating current voltage, compensating a driving alternating current voltage based on the second alternating current voltage to generate a compensated driving alternating current voltage such that a substantially equal current flows through each light emitting string of a plurality of light emitting string included in the light source apparatus, and rectifying the compensated driving alternating current voltage to apply a driving voltage to the light emitting strings. | 05-05-2011 |
20110101875 | LIGHT EMITTING DEVICE - A light emitting device includes: a plurality of light emitting elements configured to emit light when a direct current is supplied thereto; and a direct current power supply circuit configured to supply an electric current of a given level or more to the light emitting elements. The light emitting device further includes: a light emitting element voltage detection circuit configured to detect a voltage applied to the light emitting elements; and a forward/reverse inverting circuit configured, when the light emitting element voltage detection circuit detects an abnormality in a light emitting element, to apply a reverse voltage to the light emitting element in which the abnormality is detected. | 05-05-2011 |
20110109233 | MULTI-CHANNEL CURRENT DRIVER - A multi-channel current driver is provided. One of the channels includes a channel switch and a memory-type current mirror. A first end of the channel switch receives a reference current. A master current end of the memory-type current mirror is coupled to a second end of the channel switch. Wherein, a slave current end of the memory-type current mirror outputs a driving current according to the reference current when the channel switch provides the reference current to the memory-type current mirror, and the slave current end of the memory-type current mirror holds the driving current when the channel switch stops the reference current. | 05-12-2011 |
20110115387 | LED LAMP AND PROTECTING CIRCUIT THEREOF - A protecting circuit for an LED unit includes first, second, third and fourth diodes. A cathode of the second diode couples to an anode of the first diode, and a cathode of the third diode couples to a cathode of the first diode. The fourth diode includes an anode coupling to the anode of the second diode and a cathode coupling to the anode of the third diode. A first junction is formed between the first and second diodes, a second junction is formed between the third and fourth diodes, a third junction is formed between the second and fourth diodes, and a fourth junction is formed between the first and the third diodes. The first and the second junctions are connected to the LED unit. The third and fourth junctions are connected to a power source for supplying electric current to the LED unit. | 05-19-2011 |
20110115388 | LIGHT-EMITTING DIODE LIGHTING DEVICE WITH REGULATED POWER SUPPLY CIRCUIT - The invention relates to lighting devices with light-emitting diodes organized in ramps arranged in parallel, each ramp including a certain quantity of light-emitting diodes arranged in series, the ramps being powered by a DC voltage of several tens of volts, called high voltage, the high voltage being generated by a step-up converter circuit from a low DC voltage of a few volts. The value of the voltage is controlled by the duty cycle of the step-up converter circuit, and the voltage is servocontrolled to a constant average value by a servocontrol device controlling the duty cycle. Each servocontrol device has several operating modes defined by a particular electronic addressing of the high voltage or by a defined number of ramps of lit diodes. To optimize the operation of the lighting device, the step-up converter circuit has discontinuous conduction and the servocontrol device includes several servocontrol electronic circuits linked to an electronic multiplexer, and each servocontrol electronic circuit being dedicated to a particular operating mode, the electronic characteristics of the servocontrol electronic circuits depending on the operating mode. The servocontrol electronic circuit is operational only when the operating mode is selected. | 05-19-2011 |
20110115389 | DEVICE WITH LIGHT-EMITTING DIODE CIRCUITS | 05-19-2011 |
20110121740 | LED LIGHTING SYSTEM AND POWER SYSTEM THEREOF - An LED lighting system including an LED device, a current-balancing device, a comparing device, a power device, and a control device is provided. The current-balancing device generates a feedback voltage based on the operation condition of the LED device. The comparing device compares the feedback voltage with a reference voltage and accordingly generates a compared result. The power device is used for providing a DC voltage to the LED device. The control device generates a control signal based on the compared result. The power device adjusts the DC voltage according to the control signal. | 05-26-2011 |
20110127918 | LED flash bulb decorating light - A LED flash bulb decorating light with features of able to achieve complicated light variation by employing simple circuit design, which comprises a power cord with a power plug, a series of single color, dual color or multiple color LED flash bulb forming in series or parallel circuit with the power cord. And a circuit control box comprises a low pass filter circuit and a power reset circuit and installed between the power plug of the power cord and the LED flash bulb, wherein the LED flash bulb at least comprises a LED chip and an IC driving element for driving the LED chip with DC power according to the setting time sequence to generate desired light variation. And the power reset circuit reset power supply at the repeated setting time interval to enable each LED flash bulb on the power cord to restart flash sequence to maintain the desired synchronous light variation. | 06-02-2011 |
20110127919 | LIGHT-EMITTING DEVICE - A light-emitting device, electrically connected to an external variable voltage source, includes a plurality of light-emitting modules sequentially electrically connected in series and electrically connected to the external variable voltage source. Each light-emitting module has at least one light-emitting unit, a first connection terminal and a second connection terminal. At least one of the light-emitting modules has a control unit and a bypass unit electrically connected to the light-emitting unit. The second connection terminal of the light-emitting module having the bypass unit and the control unit is electrically connected to the first connection terminal of the other light-emitting module and serves as a detection terminal. The control unit detects a voltage of the detection terminal and accordingly controls the bypass unit to adjust a current flowing through the light-emitting unit. | 06-02-2011 |
20110133656 | INTENSITY BALANCE FOR MULTIPLE LAMPS - A compensation system includes first and second sensors to determine the intensities of first and second fluorescent lamps, a compensator to control the intensity of the first lamp, and a controller to adjust the intensity of the first lamp to about the same intensity as the second lamp. The lamps may be coupled in series, and the compensator may be arranged to divert current around or way from one of the lamps. | 06-09-2011 |
20110140614 | POWER FACTOR CONVERTER AND METHOD - A method and circuit for controlling feedback in, for example, a power factor converter circuit. A current sense signal is compared with a reference signal to generate a comparison signal. A clipped signal is generated from the comparison signal where the signal is a periodic waveform that transitions between two levels that are symmetrically positioned about a reference signal. The clipped signal is used to generate a summed signal at the input of an integrator. The integrator generates a feedback signal suitable for use in, for example, a power factor converter circuit. | 06-16-2011 |
20110140615 | APPARATUS AND METHOD OF DRIVING LIGHT SOURCE - A light source driving apparatus for implementing general purpose driving of a high-current light emitting diode (LED) and a low-current LED, and a method for driving the same are disclosed. The apparatus for driving the light source includes a plurality of light emitting diode (LED) strings, and a light emitting diode (LED) driving circuit for driving the LED strings, and having a plurality of channels commonly connected to the same LED string. | 06-16-2011 |
20110148311 | Controller Circuit For Half Wave LED Light Strings - A series connected light string using LEDs connected to an AC power source is disclosed. In order to make some or all of the lights color change, twinkle, and/or flash, controllers are provided in series with all or some of the LEDs. Because the supply source AC, but the active elements are essentially rectifiers, the circuit becomes a half wave DC circuit. Half wave DC will cause unpredictable behavior in DC circuit components. This will cause the controller to shut down during the zero voltage portion of the pulsating DC cycle. To prevent this a current supplying element is placed in parallel with the controller. | 06-23-2011 |
20110148312 | INTEGRATED BUCK POWER SUPPLY ARCHITECTURES FOR LED-BASED DISPLAYS - A system includes a plurality of light emitting diodes (LEDs) and a control module configured to generate pulse width modulated (PWM) pulses to drive the LEDs. The LEDs and the control module are integrated in an integrated circuit (IC) package. | 06-23-2011 |
20110148313 | METHOD AND CIRCUIT FOR CONTROLLING AN LED LOAD - The invention relates to a method for controlling an LED load. First an input voltage is supplied to an inductive element. Subsequently, a current is drawn through the inductive element for a first predetermined time period. Finally, a current is supplied from the inductive element to a first terminal of the LED load during a second time period. The first predetermined time is controlled to maintain a predetermined average current through the LED load. | 06-23-2011 |
20110156600 | SMART MONITORING OF LIGHT EMITTING DIODE STRINGS - System(s) and method(s) are provide to efficiently assess performance of a set of light emitting diode (LED) strings in an illumination system. A multiplexer component collects input signal from the one or more LED strings via a first set of one or more monitoring pins, processes the collected input signal, and extracts at least one output signal. The at least one output signal is conveyed to a demultiplexer component through a second set of one or more monitoring pins, wherein the number of elements in the second set of monitoring pins is equal to or smaller than the number of monitoring pins in the first set. The collected input signal is processed in accordance with at least one mode of operation of the multiplexer component, the mode of operation autonomously configured by the demultiplexer component. The multiplexer component can autonomously generate intelligence on operating status of the set of LED strings. | 06-30-2011 |
20110156601 | Data-processing module and method thereof - A data-processing module can handle a predetermined command transmitted by a corresponding main controller through a command serial signal or a clock signal. When the predetermined command represents “command-latching”, the data-processing module controls a command register to store the data transmitted by a section of the command serial signal temporarily stored in an FIFO buffering circuit for latching command. When the predetermined command represents “data-latching”, the data-processing module controls a command register to store the data transmitted by the section of the command serial signal temporarily stored in the FIFO buffering circuit for latching data. In this way, the data-processing module can control the command register to latch command or the data register to latch data without a redundant pin for receiving latching signals transmitted by the main controller, reducing the cost of the data-processing module. | 06-30-2011 |
20110156602 | LIGHT EMITTING DIODE DRIVING DEVICE - An LED driving device includes: an LED circuit having an input side for receiving a driving current corresponding to an AC input voltage from an external power source when the magnitude of a driving voltage across the input side is greater than a predetermined value; and a clamp circuit coupled between the input side of the LED circuit and the external power source, and permitting the driving current to pass through for clamping the magnitude of the driving current to a predetermined current level and for clamping the magnitude of the driving voltage to a predetermined voltage level. | 06-30-2011 |
20110156603 | LIGHT-EMITTING DIODE DRIVING CIRCUIT - An exemplary light-emitting diode (LED) driving circuit includes a LED driving IC, at least a LED string and at least a resistor. The LED string each is electrically coupled between a power source voltage and a control terminal of the LED driving IC and whereby a driving current of the LED string is subjected to the control of the LED driving IC. The resistor each is electrically coupled to between the control terminal and a predetermined potential. Moreover, a LED driving method also is provided. | 06-30-2011 |
20110156604 | DRIVING CIRCUIT OF LIGHT EMITTING DIODE - A driving circuit of a light emitting diode (LED) is provided, including a driving unit, a current pre-charging unit and a feedback selecting unit. The driving unit outputs a driving power to drive the LEDs and outputs at least a first feedback signal according to the current conducted by the LEDs. The current pre-charging unit is coupled to an output of the driving unit to provide a current path to the driving unit and generates a second feedback signal according to a current conducted by the current pre-charging unit. The feedback selecting unit selects and outputs one of first feedback signals or the second feedback signal according to an enable signal, and the driving unit adjusts the driving power according to an output of the feedback selecting unit so as to maintain a current driving capability of the driving circuit to provide a sufficient current to drive the LEDs. | 06-30-2011 |
20110163679 | AC LIGHT EMITTING DIODE DEVICE HAVING INTEGRATED PASSIVE DEVICE - A light emitting diode device is disclosed in the present invention. The device includes a substrate, an integrated passive device, at least four rectifying diodes and several light emitting diodes. The rectifying diodes form a bridge rectifier to rectify an external alternating current (AC) inputted into a direct current so that the light emitting diodes can lighten. Furthermore, the light emitting diode device has a Zener diode, formed on the substrate and connected with the integrated passive device for regulating the direct current. It can also have a varistor, connected with the Zener diode in parallel, for protecting the light emitting diode device from surges. | 07-07-2011 |
20110175536 | LIGHTING DEVICE - A lighting device includes a substrate and a planar light source portion including a plurality of LED chips arrayed on the substrate. The planar light source portion faces an illumination space (space to be illuminated) by a predetermined opening area. The plurality of LED chips are arrayed on the substrate such that the mounting density with respect to the opening area is not less than 3/cm | 07-21-2011 |
20110193487 | Direct AC Drive for LED Lamps - A direct driver system is disclosed for powering and regulating LED lamps. An LED driver is configured to serve as a linear regulator/switcher, thus minimizing the need for the use of switched-mode power supplies, flybacks or pulse-width modulation (PWM) in LED driver circuitry. The direct drive is configured with a voltage source, a resistive element or apparatus, and a predetermined number of LEDs optimized to produce customizable features in relation to driver efficiency, power factor and regulation. When dimming circuits are used, an active region for the LED can be defined using a phase angle of the dimming circuit. | 08-11-2011 |
20110199007 | Current regulator drive circuit shunting current by voltage-dividing load - The present invention is through the power control unit, which is connected with the voltage-dividing load in parallel, to perform shunt regulation for the current passing through the voltage-dividing load, the shunt regulation means of the power control unit is that the power control unit increases or decreases the current passing through the voltage-dividing load. | 08-18-2011 |
20110199008 | Current source, current source arrangement and their use - A current source ( | 08-18-2011 |
20110199009 | LIGHT EMITTING DIODE DRIVING APPARATUS - A light emitting diode driving apparatus ( | 08-18-2011 |
20110204799 | Current driver for LED - A current driver for powering an LED assembly comprises an input capacitor and a full wave rectifier. The LED assembly is connected to the rectifier output terminals. A driven LED assembly may be formed of series and parallel strings of individual LEDs. AC Line frequencies, e.g., 50 cycles, 60 cycles, non-line AC frequencies; and ranges of source voltages, e.g., 120 to 220 volts are accommodated by the driver. The driver provides essentially equal energy current pulses to the LED load, coincident with the time and the duration of the positive excursions of the input power. Energy is delivered to the LED load in a 50% duty cycle. Transfer of energy from an AC input power source to an LED assembly is independent of the output parameters of that source. | 08-25-2011 |
20110204800 | BACKLIGHT APPARATUS - A backlight apparatus includes light emitting diode (LED) modules. Each LED module includes a first connection pin set, a second connection pin set, a driving circuit, a first LED string, and a second LED string. Each of the connection pin sets has a first and second power connection pins and a first and second ground connection pins. The first and second power connection pins are coupled to each other, and the first and second ground connection pins are coupled to each other. The first ground connection pin of the first connection pin set is coupled to the first power connection pin of the second connection pin set. The driving circuit is used to provide a driving signal. Each of the LED strings is serially connected between the second power connection pin and the second ground connection pin of each of the connection pin sets and receives the driving signal. | 08-25-2011 |
20110210674 | Multi-LED Control - A LED driver and controller system utilizes switches to parallel connect to respective sets of one or more LEDs and a current source to provide efficient control of the LEDs. In at least one embodiment, the LEDs are connected in series. An LED controller of the LED driver and controller system | 09-01-2011 |
20110210675 | Light source module and lighting apparatus, and illumination apparatus using same - A light source module includes a substrate unit for mounting multiple light emitting diodes thereon to electrically connecting them; first and second electrical connecting terminals for supplying a current to the light emitting diodes based on a voltage applied from outside the substrate unit; and a characteristic setting unit for presetting characteristic information corresponding to a electrical characteristic of the light emitting diodes. Further, the light source module includes a third electrical connecting terminal for outputting a setting signal based on the characteristic information preset in the characteristic setting unit, and the characteristic setting unit is connected at least between the third and first electrical connecting terminals or between the third and second electrical connecting terminals, and the characteristic setting unit responds to a set-up power inputted from the third electrical connecting terminal to generate the setting signal. | 09-01-2011 |
20110210676 | Public lighting device with high energetic efficiency - Public lighting device with high energetic efficiency, including a casing ( | 09-01-2011 |
20110210677 | HOLIDAY LED LIGHTING SYSTEM AND METHODS OF USE - The present disclosure provides a decorative light string system comprising a light string comprising a plurality of lighting bulbs arranged electrically in series, wherein each light bulb comprises at least two LED chips, wherein half of said LED chips are connected in parallel and wherein half of said LED chips are connected in reverse parallel; and an adapter comprising a rectifier, wherein when the plug of the light string is plugged into the outlet adapter in a first orientation, the rectifier allows passage of a half-rectified wave lighting the LEDs connected in parallel, and wherein when the plug of the light string is plugged into the outlet adapter in a second orientation, the rectifier allows passage of a half-rectified wave lighting the LEDs connected in reverse parallel. Also included are methods of using said adapter and said decorative light string system. | 09-01-2011 |
20110227489 | Reduced flicker AC LED lamp with separately shortable sections of an LED string - An LED lamp with an integrated circuit, a rectifier, and a string of series-connected LEDs rectifies an incoming AC signal. The integrated circuit includes power switches that can separately and selectably short out a corresponding one of several groups of LEDs in an LED string across which the rectified AC signal is present. As the voltage across the string increases, the integrated circuit controls the power switches to increase the number of LEDs through which current flows, whereas as the voltage across the string decreases the integrated circuit controls the power switches to decrease the number of LEDs through which current flows. The flow of LED string current is broken to reduce flicker. Alternatively, a valley fill capacitor peaks LED current during the valleys of the incoming AC signal to reduce flicker. LED current is regulated to provide superior efficiency, reliability, power-factor correction, and lamp over-voltage, -current, and -temperature protection. | 09-22-2011 |
20110227490 | AC LED lamp involving an LED string having separately shortable sections - An LED lamp includes a rectifier, an integrated circuit and a string of series-connected LEDs. The lamp receives an incoming AC signal such that a rectified version of the signal is present across the LED string. The integrated circuit includes a plurality of power switches. Each power switch is coupled so that it can separately and selectably short out a corresponding one of several groups of LEDs in the string. As the voltage across the string increases the integrated circuit controls the power switches such that the number of LEDs through which current flows increases, whereas as the voltage across the string decreases the integrated circuit controls the power switches such that the number of LEDs through which current flows decreases. LED string current flow is controlled and regulated to provide superior efficiency, reliability, anti-flicker, regulation against line voltage variations, power factor correction, and lamp over-voltage, over-current, and over-temperature protection. | 09-22-2011 |
20110227491 | FLUORESCENT LAMP APPLIANCE, AND LIGHTING CONTROL APPARATUS OF FLUORESCENT LAMP APPLIANCE - The present Invention provides 2-lamp parallel-type and 2-lamp serial-type fluorescent lamp fixtures, in which 2-lamp lighting and 1-lamp lighting are switchable according to an ON/OFF operation of a power supply switch. In a 2-lamp parallel-type or 2-lamp serial-type fluorescent lamp fixture provided with an inverter-type stabilizer, 2-lamp lighting and 1-lamp lighting are switched by a first control circuit ( | 09-22-2011 |
20110234108 | CAPACITIVE CURRENT-SHARING CONTROL CIRCUIT FOR LED LAMP STRING - A capacitive current-sharing control circuit for LED lamp strings includes a signal generating unit, a control unit, a current-sharing unit, and a light-emitting unit. The control unit is used to control a driving voltage, which is generated from the signal generating unit, to drive the light-emitting unit, thus effectively providing a stable current source to the light-emitting unit to maintain illuminating brightness of the LED lamp strings. | 09-29-2011 |
20110234109 | LED LAMP APPARATUS AND METHOD FOR ADJUSTING COLOR TEMPERATURE OF LED MODULE THEREIN - A light emitting diode (LED) module is disclosed. The LED module includes a plurality of LED strings each including a plurality of LEDs in a serial connection with each other and disposed with respect to a central axis of a base board in a co-axial fashion, a plurality of drivers each connected to the corresponding LED string for providing adjustable driving currents to trigger each of the LED strings respectively and to adjust a color temperature of each of the LED strings, and a controller, connected to the plurality of drivers, for generating a plurality of output signals and outputting the output signals to the plurality of drivers respectively in response to a predetermined setting so as to adjust the color temperature. | 09-29-2011 |
20110248638 | LED DRIVING APPARATUS - An LED driving apparatus comprises a power supply unit that includes a transformer having a primary coil and a plurality of secondary coils and outputs alternating power from the plurality of secondary coils; a current balancing unit and a first rectification smoothing unit connected to a first secondary coil of the plurality of secondary coils; an LED load group that includes a plurality of LEDs connected in series and to which power smoothed from the first rectification smoothing unit is supplied; a power control unit that controls power to be supplied to the first and second LED loads, based on currents flowing in the first and second LED loads; and a direct current load that is connected to both ends of a second secondary coil of the plurality of secondary coils. The power supplying unit controls the alternating power, based on the power supplied to the direct current load. | 10-13-2011 |
20110254456 | Current Balancing Circuit For LED Strings - A current balancing circuit includes a plurality of LED strings each formed by a series-connection of a plurality of LEDs, a current mirror module including the same number of tri-electrodes elements as that of the LED strings, and a constant-current source providing a constant current for the LED strings. Two electrodes of one of the tri-electrodes elements are short-connected with each other, and the tri-electrodes elements are further connected with one another through one short-connected electrode thereof so as to achieve a mirror effect. The tri-electrodes elements are further one-on-one series-connected with the corresponding LED strings respectively so as to make the LED strings equally distribute the constant current from the constant-current source on the basis of the mirror effect of the current mirror module. | 10-20-2011 |
20110266961 | AC LED APPARATUS - An alternating-current (AC) light-emitting diode (LED) apparatus is disclosed. A rectifier rectifies a power AC voltage to generate a rectified voltage, which is monitored by a controller. A number of LEDs are electrically coupled between the rectified voltage and a ground. A number of switches correspondingly control at least a portion of the LEDs respectively, wherein one terminal of each switch is electrically coupled to one electrode of the corresponding LED or LEDs. The switches are controlled by the controller according to the rectified voltage. | 11-03-2011 |
20110266962 | DRIVER IC FOR ELECTRICAL LOAD AND DRIVING METHOD THEREOF - A driver IC for electrical loads, suitable for regulating a driving voltage depending upon a feedback signal and supplying a regulated driving voltage to a power supply line to which load strings are connected in parallel. The driver IC includes driving current sources respectively connected to the load strings through regulated voltage nodes and configured to supply driving current to the load strings in response to a control signal; sensing units configured to sense and output a minimum voltage among voltages of the regulated voltage nodes; a sample-and-hold circuit configured to sample, hold and output the minimum voltage in response to the control signal; and a comparator configured to compare an output voltage of the sample-and-hold circuit and a reference threshold voltage and generate the feedback signal. | 11-03-2011 |
20110279043 | CURRENT DRIVE CIRCUIT FOR LIGHT EMITTING DIODE - A pulse width modulated dimming pulse signal PWM is input to a control input terminal P | 11-17-2011 |
20110285298 | Illumination Module - A luminous module for a luminous chain may include at least one light source; and at least one electrical connection configured to supply the at least one light source, wherein the luminous module includes a heat sink. | 11-24-2011 |
20110298381 | DIMMABLE LIGHT SOURCE WITH TEMPERATURE SHIFT - An illumination device ( | 12-08-2011 |
20120007513 | PASSIVE CURRENT BALANCE DRIVING APPARATUS - A passive current balance driving apparatus has a circuit topology composed by several simple passive components and is capable of driving a plurality of LED strings simultaneously. The present passive current balance driving apparatus is mainly configured such that each LED string has the identical load characteristics during the positive and negative half cycles of the AC power. As such, the currents flowing through the respective LED strings are basically/substantially equal, thereby achieving the current balance. | 01-12-2012 |
20120007514 | LED LIGHTING DEVICE CAPABLE OF CHANGING ILLUMINATION COLOR - A LED lighting device capable of changing illumination color has an adjusting circuit, a bridge rectifier and multiple LED modules. The adjusting circuit is connected to a light regulator and produces a regulated input voltage in response to the output voltage of the light regulator. The bridge rectifier converts the regulated input voltage to a DC voltage to be applied to drive at least one of the LED modules. When the output voltage of the light regulator is changed, at least one of the LED modules receiving the DC voltage varies the illuminating intensity. Since the illuminating intensity of at least one of the LED modules is adjustable, the different colored lights emitted from all the LED modules are mixed to produce a desired light color. | 01-12-2012 |
20120013259 | LED STRING DRIVER ARRANGEMENT WITH NON-DISSIPATIVE CURRENT BALANCER - A solid state lighting driver arrangement exhibiting a plurality of LED strings receiving power from a single power source, the single power source providing a discontinuous current, wherein a plurality of first windings are provided, each associated with a particular LED string and coupled to provide current balancing between the various LED strings. The discontinuous current resets the windings during the off time or during a reversal period. In one particular embodiment, a second winding is magnetically coupled to each of the first windings, and the second windings are connected in a closed in-phase loop. In another particular embodiment, at least two of the first windings are magnetically coupled to each other, thus ensuring a balance between current in each LED string. | 01-19-2012 |
20120013260 | LIGHT EMITTING DEVICE WITH LIGHT EMITTING CELLS ARRAYED - The present invention relates to a light emitting device. The light emitting device according to the present invention comprises a light emitting cell block having a plurality of light emitting cells; and a bridge rectifying circuit connected to input and output terminals of the light emitting cell block, wherein the bridge rectifying circuit includes a plurality of diodes between nodes. In manufacturing an AC light emitting device with a bridge rectifying circuit built therein, the present invention can provide a light emitting device capable of enhancing the reliability and luminance of the light emitting device by setting the size of diodes of the bridge rectifying circuit to be a certain size and controlling the number thereof. | 01-19-2012 |
20120019153 | Direct Current Driving Circuit of a Light Emitting Device - The invention provides a direct current driving circuit of a light emitting device for driving a plurality of light emitting devices. The direct current driving circuit of the light emitting device comprises a rectification unit, a constant current unit and a light emitting module. The rectification unit is configured to rectify an outside alternate current voltage to output a direct current voltage. The constant current unit is electrically connected to the rectification unit, and generates a direct current corresponding to the direct current voltage to drive the light emitting module. The light emitting module comprises a plurality of light emitting devices and at least one diode connected in serial, and the light emitting devices are respectively connected in parallel to voltage stabilizing capacitances. The driving circuit can provide stabilized direct current load driving with high efficiency and high power factor. | 01-26-2012 |
20120025719 | LED Tube and Drive Circuit thereof - This present invention provides a lighting system. The lighting system is disposed in a lamp holder. The lighting system includes a transparent tube, a lighting module, two covers and a drive circuit. The lighting module is located inside the transparent tube. The lighting module includes a plurality of light emitting diodes (LEDs) formed in a substrate. Two covers seals two end of the transparent tube. The drive circuit is located outside the transparent tube to drive the lighting module. | 02-02-2012 |
20120025720 | POWER SUPPLY APPARATUS AND METHOD FOR A BACKLIGHT SYSTEM - A power supply system includes a transformer having a primary winding on its primary side for coupling to a power source and one or more secondary windings on its secondary side. A first control circuit is disposed on the primary side of the transformer for controlling a current flow in the primary winding. A second control circuit disposed on the secondary side of the transformer, and the second control circuit is configured to provide a regulated output voltage. In the power supply system, the first control circuit is configured to generate a control signal for controlling the current flow in the primary winding without using a feedback control signal from the secondary side of the transformer. | 02-02-2012 |
20120025721 | BACKLIGHT MODULE - The present invention provides a backlight module, and the backlight module has an LED module which has a plurality of light emitting diodes averagely divided into a plurality of light strings. Forward voltages of the light emitting diodes are between a minimum forward-voltage value and a maximum forward-voltage value, and each of the light strings at least has one first light emitting diode and one second light emitting diode. The first light emitting diode has the minimum forward-voltage value and the second light emitting diode has the maximum forward-voltage value. The backlight module is contributive to lower power loss on a constant current control circuit. | 02-02-2012 |
20120068614 | Transmitting and Receiving Digital and Analog Signals across an Isolator - Various embodiments of systems for transmitting and receiving digital and analog signals across a single isolator, solid state lighting systems, and DC/DC converter feedback regulation control systems are disclosed. At least some of the circuits, systems and methods disclosed herein may be implemented using conventional CMOS design and manufacturing techniques and processes to provide, for example, a single integrated circuit or ASIC. | 03-22-2012 |
20120074854 | LIMITED FLICKER LIGHT EMITTING DIODE STRING - A limited flicker decorative light-emitting diode (LED) string includes a power plug adapted to connect to an alternating current (AC) power source and supply AC power to the LED string, a first pair of LEDs and a second pair of LEDs, a plurality of LEDs electrically connected in series to form an LED series, and a plurality of rectifying diodes. The plurality of rectifying diodes provides full-wave rectification of the AC power to the LED series and half-wave rectification of the AC power to the first and second pair of LEDs. | 03-29-2012 |
20120081013 | Energy Conversion Device - According to one embodiment, an energy conversion device comprises a nuclear battery, a light source coupled to the nuclear battery and operable to receive electric energy from the nuclear battery and radiate electromagnetic energy, and a photocell operable to receive the radiated electromagnetic energy and convert the received electromagnetic energy into electric energy. The nuclear battery comprises a radioactive substance and a collector operable to receive particles emitted by the radioactive substance. | 04-05-2012 |
20120081014 | APPARATUS, METHOD, AND SYSTEM FOR LED FIXTURE TEMPERATURE MEASUREMENT, CONTROL, AND CALIBRATION - The present invention generally relates to the field of large area lighting, such as lighting for sport venues. More specifically, some embodiments of the present invention relate to controlling solid state illumination for various applications including sports lighting, architectural lighting, security lighting, parking, general area, interior, larger area and others. Embodiments according to aspects of the current invention monitor lighting circuits with regard to voltage and current, compare readings with stored models, characterize lighting circuits with regard to stored models for voltage and current, and control lighting circuits in accordance with desirable outcomes. | 04-05-2012 |
20120086347 | CONTROL CIRCUIT OF LIGHT EMITTING DIODES - A control circuit of light emitting diodes includes a driver and a target voltage adjuster. The driver is used for providing an output power to drive at least one series of light emitting diodes, and the driver forces a smallest terminal voltage on the terminals of the at least one series of light emitting diodes to approach a target voltage. The target voltage adjuster adjusts the target voltage according to the smallest terminal voltage. | 04-12-2012 |
20120112643 | LIGHT-EMITTING DIODE LAMP WITH MULTI-CHANNEL CONSTANT-VOLTAGE AND CONSTANT-CURRENT CONTROL - A light-emitting diode lamp with multi-channel constant-voltage and constant-current control is disclosed. The light-emitting diode lamp includes a constant-current controller, a feedback controller, a constant-voltage controller, a plurality of light-emitting diode apparatuses, a plurality of first feedback components, and a plurality of second feedback components. The constant-current controller, the feedback controller, and the constant-voltage controller are used to process current signals and voltage signals fed back from the light-emitting diode apparatuses to provide an adaptive multi-channel constant-voltage and constant-current control, thus increasing overall efficiency and operation flexibility of the light-emitting diode lamp under the alternating current or direct current power supply. | 05-10-2012 |
20120112644 | LIGHT EMITTING DIODE DRIVING INTEGRATED CIRCUIT AND METHOD FOR DRIVING A SERIES OF LIGHT EMITTING DIODES - A driving integrated circuit of light emitting diodes is used for driving a plurality of series of light emitting diodes. 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 plurality of series of light emitting diodes 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 plurality of series of light emitting diodes, so as to regulate a terminal voltage of the plurality of series of light emitting diodes to the target voltage. | 05-10-2012 |
20120119663 | LIGHT EMITTING DIODE CURRENT CONTROL CIRCUIT CAPABLE OF ENERGY RECYCLING - Alight emitting diode current control circuit capable of energy recycling includes at least one diode and at least one converter. The diode has an anode terminal, and a cathode terminal for coupling to a first terminal of at least one series of light emitting diodes. The converter has a first terminal coupled to an anode terminal of a corresponding diode, a second terminal for coupling to a second terminal of a series of light emitting diodes corresponding to the converter, a third terminal, and a fourth terminal coupled to ground. | 05-17-2012 |
20120126710 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - Embodiments in accordance with the present invention provide circuits and methods for driving light sources, e.g., a light-emitting diode (LED) light source. In one embodiment, a lamp includes a rectifier rectifying an AC voltage to a rectified AC voltage, an LED light source, and a switch coupled to the LED light source in series controlling a current through the LED light source according to a predetermined current reference. The LED light source and the switch coupled in series receive the rectified AC voltage while the switch is controlled linearly. | 05-24-2012 |
20120126711 | PLANAR LIGHT EMITTING DEVICE - A sensor circuit or a display apparatus from which a highly accurate sensor output can be obtained includes a photodiode, a capacitor that is connected to the photodiode via an accumulation node and accumulates charges according to an electric current in the photodiode; a sensor switching element transistor that causes the accumulation node and an output line to be conductive with respect to each other in response to a readout signal and outputs an output signal according to the potential of the accumulation node to the output line; a variable capacitor that is provided between the accumulation node and an input electrode, and whose capacitance varies when a pressure is applied by a touching operation; and a control switching element transistor to which a control signal for switching conduction and non-conduction between the variable capacitor and the accumulation node is input. | 05-24-2012 |
20120133288 | CIRCUIT STRUCTURE CAPABLE OF STRAIGHT/REVERSE CONNECTION OF POSITIVE AND NEGATIVE ELECTRODES OF AN INPUT POWER SOURCE - The present invention provides a circuit structure capable of straight/reverse connection of positive and negative electrodes of an input power source, which includes a load, an input power portion, a protection unit, a first switch unit and a second switch unit. The first switch unit and the second switch unit can respectively select an ON or OFF state based on the electrical polarities of a first electrode end and a second electrode end of the input power portion. By this arrangement, the circuit structure of the present invention can be operated normally no matter whether the positive and negative electrodes of the input power source are straightly or reversely connected. | 05-31-2012 |
20120133289 | AC LED Light Source with Reduced Flicker - A lighting apparatus and method for operating LED-based lighting devices are disclosed. The apparatus includes a receiver that receives a potential from a power source whose output varies as a function of time, an energy storage device, and an LED array. The energy storage device stores energy from the power source when the driving potential is greater than a predetermined value. The LED array has variable forward bias potential, the LED array generating light when a potential across the array is greater than the selected forward bias potential. A source selector connects the energy storage device to the array when the potential from the power source is less than a predetermined value. A controller that varies the forward bias potential such that the difference between the forward bias potential and potential across the array is maintained at a value less than a predetermined value. | 05-31-2012 |
20120133290 | IMAGE DISPLAY APPARATUS - An image display apparatus includes a main body in which a display unit is disposed, and a backlight unit that is detachable from the main body and to which a plurality of LED modules are attached, each of which is provided with LEDs, so that the image display apparatus displays an image on the display unit with backlight light emitted by the LEDs. The plurality of LED modules are assigned with different channels as units of control of light emission luminance of the LEDs and can be replaced independently of each other. | 05-31-2012 |
20120139428 | DEVICE FOR CONTROLLING AN ELECTRICAL LOAD - A device serves to control an electrical load of at least two single loads connected in series. Each of the at least two single loads is connected in parallel to a controllable switch, so that each of the at least two single loads can be switched independently of one another. In addition, a driver stage that drives a current into the electrical load is present. The controllable switches can be controlled by the control unit. A dummy load is connected in series to the at least two single loads. | 06-07-2012 |
20120153844 | LIGHTING APPARATUS USING A NON-LINEAR CURRENT SENSOR AND METHODS OF OPERATION THEREOF - A lighting apparatus includes a lighting circuit including at least one light-emitting device, e.g., a string of LEDs, and at least one current sense diode configured to generate a forward voltage responsive to a current passing through the at least one light-emitting device. The apparatus further includes a control circuit configured to control the lighting circuit responsive to the generated forward voltage. In some embodiments, the least one light-emitting device includes the at least one current sense diode. In some embodiments, the at least one current sense diode is connected in series with the at least one light-emitting device. | 06-21-2012 |
20120153845 | SOLID STATE LIGHTING CONTROL METHODS AND APPARATUSES FOR SERIES COMBINATIONS OF LIGHT EMITTING DIODES - A lighting apparatus comprises a lighting circuit and a control circuit. The lighting circuit includes a first sub-circuit comprising one or more solid state lighting (SSL) devices and having a diode electrical characteristic, and a second sub-circuit comprising one or more SSL devices and having a diode electrical characteristic. The first sub-circuit and the second sub-circuit are electrically connected in series with the cathode of the first sub-circuit and the anode of the second sub-circuit electrically connected at a first/second electrical connection. The control circuit includes an electrical drive voltage or current supply connected to drive the lighting circuit, and an adjustment current source connected with the first/second electrical connection to increase electrical current flowing in one of the first sub-circuit and the second sub-circuit without adjusting electrical current flowing in the other of the first sub-circuit and the second sub-circuit. | 06-21-2012 |
20120176046 | LIGHTING DEVICE - The present invention is directed to a lighting device. A lighting unit includes at least one lighting string, and each lighting string includes one or serial-connected lighting elements. An AC/DC power converter converts an AC voltage to a DC voltage, therefore providing a current to the lighting unit. In one embodiment, a detecting unit performs detection to generate a detect signal; in another embodiment, a brightness adjusting unit, after adjustment, generates adjust signals that represent different brightness modes respectively. Subsequently, a resistor network generates a control signal according to the detect signal or the adjust signal, and a switch unit controls the brightness of the lighting unit according to the control signal. | 07-12-2012 |
20120176047 | Lighting Apparatus and Light Emitting Diode Device Thereof - The present invention provides a light emitting diode (LED) device. The LED device include a driver, a first LED coupled in series with the driver, and an impedance-providing component coupled in parallel with the first LED and in series with the driver. The impedance-providing component provides a shunt impedance having a value that varies in positive proportion with a variation in an ambient temperature. The driver is respectively coupled in series with the first LED and the at least one impedance-providing component. The driver provides a drive current divided to flow through the first LED and the at least one impedance-providing component according to the shunt impedance and the internal impedance. | 07-12-2012 |
20120206052 | LED DEVICE WITH SHARED VOLTAGE-LIMITING UNIT AND INDIVIDUAL EQUALIZING RESISTANCE - The present invention relates to a LED device with shared voltage-limiting unit and individual voltage-equalizing resistance, wherein two ends of a LED set constituted by a plurality of same-polarity series LEDs are in parallel connected with a shared voltage-limiting unit, and two ends of individual LED are respectively in parallel connected with an voltage-equalizing resistance for providing an overvoltage protection to the LEDs. | 08-16-2012 |
20120206053 | LED DEVICE WITH VOLTAGE-LIMITING UNIT AND VOLTAGE-EQUALIZING RESISTANCE - The present invention provides a LED device with voltage-limiting unit and voltage-equalizing resistance in which a light-emitting unit is structured through a LED being connected in parallel with a voltage-limiting unit in the same polarity, and two ends thereof being further connected in parallel with an voltage-equalizing resistance, so that when plural sets of the light-emitting units are connected in series or in series-parallel in the same polarity, the end voltage of each set is stabilized by the voltage-equalizing resistance connected in parallel with the two ends of the LED and the voltage-limiting unit. | 08-16-2012 |
20120206054 | LED DRIVING CIRCUIT - An LED (Light Emitting device) driving circuit is disclosed, the circuit characterized by: at least two LED strings ( | 08-16-2012 |
20120217882 | LED lighting system - A lighting system includes at least one lighting apparatus having a light emitting element capable of emitting a controllably variable light output in a region. A position determination subsystem is capable of determining a position in three dimensions of at least one mobile entity within the region. A control subsystem is capable of variably controlling a light output of the at least one lighting apparatus according to the position of the mobile entity. The system may determine position by radio ranging with mobile electronic elements. The system may include multiple lighting elements and may determine light levels according to positions of multiple mobile entities. The system may include a database of information about lighting elements, mobile entities, and lighting plans that may be selected from mobile electronic elements. | 08-30-2012 |
20120217883 | Lighting Apparatus Using PN Junction Light-Emitting Element - The present disclosure discloses a lighting apparatus using a PN junction light-emitting element, the apparatus comprising: a power transmitting substrate; PN junction light-emitting elements mounted on the power transmitting substrate; circuit elements mounted on the power transmitting substrate and controlling power provided to the PN junction light-emitting elements; and a top cover covering the circuit elements and forward reflecting light emitted by the PN junction light-emitting elements. | 08-30-2012 |
20120235581 | LIGHT EMITTING DEVICE - A light emitting device includes a substrate, a plurality of rectifier diodes, and at least one light emitting diode (LED) module. The substrate has a first cavity, a second cavity, and a third cavity formed thereon. The rectifier diodes are arranged in the first cavity and the third cavity respectively. The LED module is arranged in the second cavity. The LED module includes a plurality of LEDs. The light emitting device is capable of rectifying and converting an alternating current (AC) power supply to drive the LEDs to emit light. | 09-20-2012 |
20120248995 | Method and Circuit Arrangement for Producing Mixed LED Light of a Predetermined Color - The invention relates to a method for operating a range of LEDs preferably fed with constant current, which range of LEDs preferably generates white mixed light with at least two LED types of different spectrum, wherein the movement of the colour locus of the mixed light, which is caused by the different negative gradients of the temperature dependencies of the intensity of at least two different LED types, is reduced by circuitry without using measurements and feedback variables. | 10-04-2012 |
20120306386 | LED DRIVE DEVICE AND LED ILLUMINATING DEVICE - An LED drive device whose power dissipation can be effectively reduced without halting current supply to an LED row as well as an LED illuminating device with the LED drive device incorporated therein. When an LED | 12-06-2012 |
20120306387 | LED DRIVER ARRANGEMENT WITH MULTIPLE CURRENT MIRRORS - A current balancer arrangement constituted of a plurality of current mirror circuits, each of the current mirror circuits comprising a master leg and at least one slave leg is enabled. A constant current source is provided, arranged to provide power for a plurality of LED strings in parallel. Each of the plurality of LED strings is further arranged in series with a master leg of a particular one of the plurality of current mirror circuits, and with the slave leg of each of the balance of the current mirror circuits. | 12-06-2012 |
20120326613 | LIGHT EMITTING DEVICE ARRAY DRIVER CIRCUIT AND CURRENT SPLITTER CIRCUIT AND METHOD OF SPLITTING CURRENT THEREFOR - The present invention discloses a current splitter circuit for splitting a supply current to multiple light emitting device strings of a light emitting device array. The current splitter circuit includes: a minimum selector circuit coupled to the multiple light emitting device strings to generate a minimum signal which indicates a minimum voltage of the light emitting device strings; and multiple current source circuits each including a first current source end coupled to a corresponding light emitting device string, a second current source end coupled to ground, and a current source control end receiving a current control signal related to the minimum signal, so as to control currents through the corresponding light emitting device string. | 12-27-2012 |
20130002153 | Multi-Color Light Emitting Device Circuit - The present invention discloses a multi-color light emitting device circuit, which includes: multiple light emitting device strings of different colors, a timing control circuit, a power regulator circuit, and preferably a dark feedback circuit. Each light emitting device string has multiple light emitting devices coupled in series. The number of the light emitting devices of each light emitting device string is determined by an operational voltage of the light emitting device, wherein at least two of the light emitting device strings have different numbers of the light emitting devices, such that voltage drops of the two light emitting device strings are closer to each other than in a case wherein the two light emitting device strings have the same number of the light emitting devices, and the response time of the light emitting device strings are increased. | 01-03-2013 |
20130002154 | ILLUMINATING APPARATUS AND DRIVING METHOD THEREOF - An illuminating apparatus includes a drive circuit that generates a drive current, and an organic light emitting panel that receives the drive current and that emits light. The drive circuit is capable of controlling a color temperature of the emitted light from the organic light emitting panel by controlling a current strength of the drive current and is capable of controlling a brightness of the emitted light according to a pulse width of the drive current. | 01-03-2013 |
20130009556 | Electronic Circuits and Techniques for Maintaining a Consistent Power Delivered to a Load - Circuits and methods used therein provide an adjustable average current through a load in accordance with a pulse width modulated (PWM) signal. A condition detection circuit is configured to identify a condition of the electronic circuit and to generate a condition signal indicative of the condition. A current extension circuit is coupled receive the condition signal and coupled to receive the PWM signal. The current extension circuit is configured to generate, at the output node of the current extension circuit, an extended PWM signal having a first state and a second state. The first state of the extended PWM signal longer in time than a first state of the PWM signal by an amount related to a value or a state of the condition signal. Current pulses through the load are extended to be longer in accordance with the extended PWM signal. | 01-10-2013 |
20130015772 | LIGHTING DEVICE - A lighting device is provided. The lighting device comprises a first substrate and a plurality of second substrates. The plurality of second substrates are separately and electrically connected to the first substrate and comprise a light emitting device. | 01-17-2013 |
20130026930 | HIGH-EFFICIENCY AC-DRIVEN LED MODULE - A high-efficiency Alternating Current (AC)-driven Light-Emitting Diode (LED) module includes a full-wave rectification unit, an LED unit, at least one instantaneous current control unit, and at least one input power compensation unit. The full-wave rectification unit rectifies commercial supply voltage. The LED unit is configured such that LEDS connected in series are arranged separately or in groups. The instantaneous current control unit sequentially controls the sections of the LEDs connected in series. The input power compensation unit actively controls variations in input current and power attributable to variations in input voltage. The full-wave rectification unit, the LED unit, the instantaneous current control unit, and the input power compensation unit are formed of a one-board module (ASIC) or an Integrated Circuit (IC). | 01-31-2013 |
20130049613 | RESONANT NETWORK FOR REDUCTION OF FLICKER PERCEPTION IN SOLID STATE LIGHTING SYSTEMS - An apparatus and method for reducing the perception of flicker of solid state light sources. An alternating current (AC) signal is passed through an AC conditioning circuit and a passive resonating circuit before being supplied to a string of solid state light sources, such as light emitting diodes. | 02-28-2013 |
20130057163 | REGULATOR FOR LED LIGHTING COLOR MIXING - A system includes a first light emitting diode configured to produce light of a first color and a second light emitting diode configured to produce light of a second color. A constant current circuit is configured to provide a first current, wherein (i) the first current is approximately constant, (ii) a first portion of the first current flows through the second light emitting diode, and (iii) a remaining portion of the first current flows through the first light emitting diode. A current regulating circuit is configured to control the first portion of the first current flowing through the second light emitting diode. The current regulating circuit is connected in series with the second light emitting diode, the constant current circuit, and a reference potential. The first light emitting diode is connected in series directly between the constant current circuit and the reference potential. | 03-07-2013 |
20130057164 | Inductive Electronic Module and Usage of Such - An inductive electronic module comprises a planar core element having an inner limb and at least two lateral limbs, to which winding arrangements are assigned for forming a transformer. First and second partial windings are formed on first and second of the lateral limbs such that a resulting magnetic flux of the first planar winding arrangement is cancelled in the inner limb and the second planar winding arrangement is magnetically decoupled from the first planar winding arrangement on the inner limb. The inner limb has a first core section for interacting with the second planar winding arrangement and a second core section spaced from the first core section on the core element. The second core section interacts with an additional planar winding arrangement, which forms a series connection with the second planar winding arrangement. The second core section implements a magnetically active air gap for the additional planar winding arrangement. | 03-07-2013 |
20130082609 | Low Cost LED Driver With Integral Dimming Capability - A distributed system for driving strings of series-connected LEDs for backlighting, display and lighting applications includes multiple intelligent satellite LED driver ICs connected to a an interface IC via serial bus. The interface IC translates information obtained from a host microcontroller into instructions for the satellite LED driver ICs pertaining to such parameters as duty factor, current levels, phase delay and fault settings. Fault conditions in the LED driver ICs can be transmitted back to, the interface IC. An analog current sense feedback system which also links the LED driver ICs determines the supply voltage for the LED strings. | 04-04-2013 |
20130082610 | TEMPERATURE CURVE COMPENSATION OFFSET - A lighting device includes a first array of LEDs, a temperature sensor, memory, and a system controller. The memory may include a first duty cycle offset and first curve information that defines a relationship between temperature and a duty cycle for driving at least one LED of the first array of LEDs. The system controller will determine a temperature based on information from the temperature sensor. Based on the temperature, the system controller will determine a first pre-calibrated duty cycle that corresponds to the temperature from the first curve information and then adjust the first pre-calibrated duty cycle with the first duty cycle offset to generate a first calibrated duty cycle. The LED is then driven with a first pulse width modulated signal having the first calibrated duty cycle. | 04-04-2013 |
20130082611 | FEED FORWARD CONTROLLED VOLTAGE TO CURRENT SOURCE FOR LED DRIVER - A DC to DC converter receives a DC input voltage and generates an output DC voltage. A current sensor measures a DC input current. A control circuit is coupled to the current sensor for controlling the DC to DC converter to have a constant DC input current. | 04-04-2013 |
20130082612 | Light Emitting Devices and Systems Having Tunable Chromaticity and Methods of Tuning the Chromaticity of Light Emitting Devices and Systems - A light emitting device package assembly includes a light emitting device package body, and first, second and third white light emitting devices on the package body, each of the first, second and third white light emitting devices emits light when energized having a chromaticity that falls within a respective one of first, second and third non-overlapping chromaticity regions in a two dimensional chromaticity space. The first, second and third chromaticity regions are spaced apart in the two dimensional chromaticity space by respective regions having at least the size of a seven step MacAdam ellipse. Related solid state luminaires and methods are also disclosed. | 04-04-2013 |
20130099680 | LIGHT SOURCE DRIVING DEVICE - A light source driving device includes a light source unit, a driving unit, a voltage converting unit, a detecting unit, and a feed-back control unit. The driving unit is used to receive an input signal, and convert the input signal to a driving signal for output according to an enable signal and a feed-back signal. The voltage converting unit is used to convert the driving signal to a driving voltage, so as to output the driving voltage to a first end of the light source unit. The detecting unit is coupled to a second end of the light source unit, and used to detect an output current of the light source unit, so as to generate a detecting voltage. The feed-back control unit generates the feed-back signal according to the detecting voltage and a pulse width modulation signal. | 04-25-2013 |
20130099681 | Low Cost LED Driver With Improved Serial Bus - An LED driver IC for driving external strings of LEDs comprises a prefix register and a data register connected in series with each other and with the prefix and data registers in other driver ICs. The prefix and data registers of the driver ICs are connected in a daisy chain arrangement with an interface IC. The interface IC loads data identifying a functional latch into the prefix register and data defining a functional condition into the data register of each driver IC. The data in the data register is then transferred to the functional latch to control the functional condition within the LED driver IC. | 04-25-2013 |
20130099682 | Low Cost LED Driver With Improved Serial Bus - An LED driver IC for driving external strings of LEDs comprises a prefix register and a data register connected in series with each other and with the prefix and data registers in other driver ICs. The prefix and data registers of the driver ICs are connected in a daisy chain arrangement with an interface IC. The interface IC loads data identifying a functional latch into the prefix register and data defining a functional condition into the data register of each driver IC. The data in the data register is then transferred to the functional latch to control the functional condition within the LED driver IC. | 04-25-2013 |
20130099683 | LIGHT-EMITTING DIODE DRIVING APPARATUS FOR SUPPRESSING HARMONIC COMPONENTS - An LED driving apparatus for suppressing harmonic components is provided. First and fourth portions | 04-25-2013 |
20130106297 | THERMAL PROTECTION STRUCTURE FOR MULTI-JUNCTION LED MODULE | 05-02-2013 |
20130119872 | SOLID STATE LIGHTING SWITCHES AND FIXTURES PROVIDING SELECTIVELY LINKED DIMMING AND COLOR CONTROL AND METHODS OF OPERATING - A solid state lighting switch can include a first input control that can be configured to adjust a dimming indication or color indication for a solid state lighting fixture that is configured for coupling to the solid state lighting switch. A selective linking mechanism can be configured to activate a linked mode of operation of the switch to link the dimming indication to the color indication or to activate an unlinked mode of operation of the switch to unlink the dimming indication from the color indication. | 05-16-2013 |
20130119873 | LIGHT EMITTING DEVICE AND METHOD OF CONTROLLING LIGHT EMITTING DEVICE - An LED backlight includes a light emitting unit, a driver, a current divider, and a power supply unit. The lighting unit includes a plurality of LEDs connected in series. The driver is connected in series with the LEDs and configured to control driving of the light emitting unit. The current divider is connected in parallel to the driver of a series circuit including the light emitting unit and the driver. The power supply unit is configured to apply a voltage to the series circuit. | 05-16-2013 |
20130147369 | LED LIGHT STRING AND LED MODULE WITH AN INTEGRATED SIGNAL CONTROLLER THEREOF - An LED light string has multiple LED modules connected in series and a control device connected to the LED modules. Each LED module has a pin assembly, at least one LED chip and a signal controller. The pin assembly has a substrate and multiple pins. The multiple pins include a first power pin, a second power pin, a first signal pin and a second signal pin. The substrate is formed on a top end of the first power pin. The LED chip and the signal controller are mounted on the substrate. The pin assembly, the at least one LED chip and the signal controller are electrically connected to each other. Because the signal controller is integrated in the LED module, the signal controller receives a control signal to activate the LED chip directly. | 06-13-2013 |
20130147370 | Serial Lighting Interface With Embedded Feedback - A system for controlling multiple strings of LEDs includes a group of LED driver ICs, each of which includes a current sense feedback (CSFB) sample latch for storing a digital representation of the forward-voltage drop across a controlled LED string. Each CSFB latch is coupled to a register within a serial lighting interface (SLI) bus that both originates and terminates at an interface IC. As the data on the SLI bus is shifted into the interface IC, the interface IC selects the CSFB word that represents the highest forward-voltage drop of any of the controlled LED strings, which is then used by the interface IC to generate a CSFB signal for setting the appropriate supply voltage for the controlled LED strings. | 06-13-2013 |
20130147371 | Serial Lighting Interface With Embedded Feedback - A system for controlling multiple strings of LEDs includes a group of LED driver IC's, each of which includes a current sense feedback (CSFB) sample latch for storing a digital representation of the forward-voltage drop across a controlled LED string. Each CSFB latch is coupled to a register within a serial lighting interface (SLI) bus that both originates and terminates at an interface IC. As the data on the SLI bus is shifted into the interface IC, the interface IC selects the CSFB word that represents the highest forward-voltage drop of any of the controlled LED strings, which is then used by the interface IC to generate a CSFB signal for setting the appropriate supply voltage for the controlled LED strings. | 06-13-2013 |
20130147372 | Serial Lighting Interface With Embedded Feedback - A system for controlling multiple strings of LEDs includes a group of LED driver ICs, each of which includes a current sense feedback (CSFB) sample latch for storing a digital representation of the forward-voltage drop across a controlled LED string. Each CSFB latch is coupled to a register within a serial lighting interface (SLI) bus that both originates and terminates at an interface IC. As the data on the SLI bus is shifted into the interface IC, the interface IC selects the CSFB word that represents the highest forward-voltage drop of any of the controlled LED strings, which is then used by the interface IC to generate a CSFB signal for setting the appropriate supply voltage for the controlled LED strings. | 06-13-2013 |
20130147373 | Aircraft LED Washlight System and Method for Controlling Same - A modular area washlight illumination system and method for operating are provided that comprise an intelligent light module group that has: one or more light modules, each of which comprises a plurality of discrete illumination sources; a power supply; and an intelligent module group controller comprising: a) circuitry that controls the illumination levels of the illumination sources; and b) an interface for receiving and sending information. The system further comprises a system controller that comprises: a) an attendant control panel serving as a user interface; and b) a system controller interface that is connected to the module group controller interface. | 06-13-2013 |
20130169171 | LIGHT EMISSION DRIVER DEVICE - A light emission driving device includes a shunt resistor, a driver circuit and a correction circuit. The shunt resistor converts a magnitude of a driving current flowing in a LED group into a voltage value. The driver circuit | 07-04-2013 |
20130181619 | HIGH EFFICIENCY LEDS AND LED LAMPS - In various embodiments, lighting systems include an electrically insulating carrier having a plurality of conductive elements disposed thereon, a light-emitting array, and at least one power source. The light-emitting array is disposed over the carrier and includes a plurality of light-emitting strings, each light-emitting string comprising a plurality of light-emitting diodes (LEDs) electrically connected in series. Each LED has at least two electrical contacts, and each electrical contact is electrically connected to a conductive element by a solder. The power source provides power to the light-emitting strings. | 07-18-2013 |
20130193859 | Apparatus, Circuit and Method for Automatic Phase-Shifting Pulse Width Modulated Signal Generation - Systems, circuits and methods for phase-shifting pulse width modulated signal generation are disclosed. In some embodiments, a phase-shifting pulse width modulation circuit is configured to output pulses based on an input pulse width modulated signal. The pulses are staggered relative to one another, and can be received by a light-emitting diode driver for driving a light-emitting diode string at one or more time periods. The phase-shifting pulse width modulation circuit can include a counter-based programmable delay subcircuit consisting of two counter-based programmable delay blocks. | 08-01-2013 |
20130214690 | High Efficiency LED Power Supply - There is an increasing need for simple and low cost power supplies to control loads such as battery chargers and LEDs. It is the object of this invention to provide an alternative method for the control of current in such loads with very high efficiency and to reduce the variation of load current with supply voltage. This invention is particularly relevant to LED power supplies or battery chargers and provides an electronic power supply for the control of an electrical load connected to an electrical source, the electrical load comprising a main load with at least one LED and an auxiliary load with at least one LED, the electronic power supply comprising a series compensation block connected in series with the main load and the voltage source, the series compensation block providing a voltage in opposition to the voltage source by directly controlling the power delivered to the auxiliary load and indirectly controlling the power converted in the main load. | 08-22-2013 |
20130229119 | Dimmable Solid State Lighting System, Apparatus and Method, with Distributed Control and Intelligent Remote Control - Exemplary systems, methods and apparatuses for a distributed solid-state lighting system are disclosed. An exemplary system comprises a central power source, and one or more terminal lighting apparatuses. An exemplary central power source comprises: an AC/DC rectifier coupled to a DC/DC converter to convert an AC input power to a first DC voltage level; a central user interface to receive user input for a selected brightness level; and a central controller to provide a first control signal to the DC/DC converter to provide a second DC voltage level corresponding to the selected brightness level. A terminal lighting apparatus may comprise: a plurality of LEDs; a current (or power) source or regulator; and a terminal controller which, in response to the second DC voltage level, provides a second control signal to the current source or regulator to provide a selected current level of the LEDs corresponding to the selected brightness level. | 09-05-2013 |
20130234609 | LED LIGHTING DEVICE - When a pulsating current is applied to an LED string included in an LED lighting device, and the number of LEDs caused to light up is changed, the LED lighting device is in efficient, since there are LEDs lighting up for a long period of time and LEDs lighting up only for a short period of time. The LED string includes LED string | 09-12-2013 |
20130249415 | CURRENT-LIMITING DEVICE AND LIGHT-EMITTING DIODE APPARATUS CONTAINING THE SAME - An LED apparatus includes an LED component and a current-limiting device. The LED component includes at least one LED having a corresponding current-limiting resistance value. The current-limiting device includes a plurality of PTC devices connected in series. The plurality of PTC devices are capable of effectively sensing the temperature of the LED and are electrically coupled to the LED component. The resistance value of the current-limiting device increases with the increment of sensed temperature. The current-limiting device has a resistance close to or equal to the current-limiting resistance value at a temperature at which the LED operates normally. When the temperature of the LED gradually increases to an abnormal temperature, current allowable to be flowed through the current-limiting device gradually decreases to be lower than LED operating current. | 09-26-2013 |
20130249416 | POWER SUPPLY SYSTEM AND CONTROLLING METHOD - A method for controlling a current of a power supply system includes following steps. First, the power supply is started to produce an output current and the output current is increased. Afterward, the output current is decreased when the output current increases to a rated output current value. Finally, the output current is maintained at a typical output current value when the output current decreases to the typical output current value. | 09-26-2013 |
20130249417 | Flexible LED Pixel String With Two Shielding Ground Lines - The present invention relates to a flexible LED pixel string comprising a number of LED pixels interconnected by a flexible cable, where the flexible LED pixel string comprises a connector for connecting the flexible LED pixel string to a data and power feeder. The flexible cable comprises a first conductor being a power line, a second conductor being a data line, a third conductor being a clock line, a fourth conductor being a first ground line and a third conductor being a second ground line. The data line or the clock line are arranged between the first ground line and the second ground line. | 09-26-2013 |
20130257298 | POWER COMPENSATION DEVICE AND LIGHT EMITTING DIODE ILLUMINATION APPARATUS HAVING THE SAME - A light emitting diode (LED) illumination device having a power compensation function is provided. The illumination device includes a light emitting unit including a plurality of LEDs connected in series, a rectifier for rectifying input AC power to provide a rectified voltage to the light emitting device, and a power compensator for detecting a change in the rectified voltage provided to the light emitting device and compensating a current provided to the light emitting device according to the detected change in the rectified voltage. | 10-03-2013 |
20130278152 | LIGHT EMITTING DIODE LIGHTING DEVICE AND LIGHT EMITTING DIODE LAMP - The present application discloses a light emitting diode lighting device and a light emitting diode lamp, the light emitting diode lighting device includes: a fluorescent lamp ballast outputting an alternating current; and at least one first light emitting diode lamp coupled with the fluorescent lamp ballast, and comprising a rectifying and filtering circuit and at least one light emitting diode string coupled with the rectifying and filtering circuit. The present application directly replaces a conventional fluorescent lamp tube with a properly designed LED lamp without any other modifications when reinstallation a conventional fluorescent lamp lighting device into a light emitting diode lighting device, which may reduce the cost of reinstallation, and greatly facilitate the user. | 10-24-2013 |
20130278153 | SOLID-STATE LIGHT SOURCE - In one aspect, a light source module includes one or more light emitters of a first color forming a first color group, one or more light emitters of a second color forming a second color group, the one or more light emitters of the second color group connected in series to the one or more light emitters of the first color group, a second color group adjustment circuit connected in parallel to the one or more light emitters of the second color group, the second color group adjustment circuit configured to adjust one or both of color and intensity of output light of the second color group, and a current source connected in series to solid-state color emitters of the first and the second color groups. | 10-24-2013 |
20130278154 | POWER SUPPLY - A power supply is provided. The power supply includes at least one light emission unit, a power source, an openness detection circuit, and a feedback control unit. The at least one light emission unit includes a plurality of serially connected LEDs. The power source supplies a DC voltage to the light emission unit. The openness detection circuit varies a reference potential with a voltage which is detected from both ends of at least one of the LEDs in the light emission unit. The feedback control unit regulates an output current of the power source according to the reference potential of the openness detection circuit. | 10-24-2013 |
20130285563 | Power Supply Device, Luminaire, Control Method for the Power Supply Device, and Control Method for the Luminaire - According to one embodiment, a control circuit detects power supply voltages converted by switching elements for conversion and subjects the switching elements for conversion to feedback control. The control circuit subjects all of a switching element for power factor improvement and a plurality of the switching elements for conversion to switching control at different switching frequencies. | 10-31-2013 |
20130293122 | Reduced Flicker AC LED Lamp With Separately Shortable Sections Of An LED String - An LED lamp with an integrated circuit, a rectifier, and a string of series-connected LEDs rectifies an incoming AC signal. The integrated circuit includes power switches that can separately and selectably short out a corresponding one of several groups of LEDs in an LED string across which the rectified AC signal is present. As the voltage across the string increases, the integrated circuit controls the power switches to increase the number of LEDs through which current flows, whereas as the voltage across the string decreases the integrated circuit controls the power switches to decrease the number of LEDs through which current flows. The flow of LED string current is broken to reduce flicker. Alternatively, a valley fill capacitor peaks LED current during the valleys of the incoming AC signal to reduce flicker. LED current is regulated to provide superior efficiency, reliability, power-factor correction, and lamp over-voltage, -current, and -temperature protection. | 11-07-2013 |
20130328490 | LED LIGHT STRING AND CONTROL METHOD THEREOF - A LED light string contains an adjustable remote control and a control host connected with the LED light string, wherein the adjustable remote control includes a button set, a subhost MCU, and a TX transmitter module, the sub host includes a TX coding module, and a variation of a pressed time and/or a pressing way of the button set generates a press signal received and coded by the TX coding module; the control host includes a RX receiver module and a host MCU; the host MCU includes an AC 60 HZ/50 HZ synchronization over-zero module, a RF decoding analysis module, and a two-way controllable silicon driving circuit module, thus controlling a light flash of the LED light string. | 12-12-2013 |
20130334974 | LIGHTING DEVICE - Providing a lighting device wherein provisions are made to be able to provide a sufficiently high dielectric strength while retaining the required heat-sink property even when a module substrate with a plurality of LED elements mounted thereon is reduced in size. A lighting device includes a module substrate on an upper surface of which are mounted a plurality of LED elements, a heat-sink member, having a raised portion, for dissipating heat generated by the plurality of LED elements, and an insulating sheet formed with an opening and interposed between a portion of the lower surface of the module substrate and the heat-sink member, and wherein the raised portion is formed so as to be located via the opening in close proximity to the lower surface of a region where the plurality of LED elements are mounted on the module substrate. | 12-19-2013 |
20130342115 | LIGHT-EMITTING DEVICE - A light-emitting device is connected with an alternating current (AC) power and includes a first light-emitting module and a second light-emitting module. The first light-emitting module is electrically connected with the AC power and has a first light-emitting unit and a first bypass unit which is in parallel connection with the first light-emitting unit. The second light-emitting module is in series connection with the first light-emitting module and has a first connection terminal, a second connection terminal and n second light-emitting units which are connected in series between the first and second connection terminals. There are n−1 third connection terminals configured between the n second light-emitting units. Each of the n−1 third connection terminals and the second connection terminal are connected to the first connection terminal through a second bypass unit. | 12-26-2013 |
20140009074 | LED LAMP STRING - The present invention relates to LED lamp string, comprising at least three conducting wires with insulating layers. One of the conducting wires is a positive conducting wire, and the others are negative conducting wires. A mounting part is provided on each negative conducting wire at every certain interval. A light emitting wafer is fixed to the mounting part. The light emitting wafer comprises a first electrode and a second electrode which are separately provided. The first electrode of the light emitting wafer connected with each negative conducting wire is electrically connected with the conductor of the same negative conducting wire. The second electrode is electrically connected with the conductor of the positive conducting wire via a wire. A transparent outer sealing gum encapsulating the mounting part, the light emitting wafer and the wire is provided on the LED lamp string. | 01-09-2014 |
20140015424 | MULTI-STRING LED DRIVE SYSTEM - A multi-string LED drive system for multiple LED strings powered by a common line voltage. A plurality of current control circuits are connected in series with respective LED strings, each of which includes a transistor which causes a desired LED string current to be conducted when a sufficient voltage is applied to the transistor's gate. A “maximum” circuit receives each of the gate voltages at respective inputs and outputs a voltage which is proportional to the greatest of the received voltages. A line regulator circuit receives the output of the maximum circuit and a signal which represents a target gate voltage at respective inputs and generates the common line voltage such that the highest of the gate voltages is approximately equal to the target gate voltage, such that system power efficiency is optimized in cases of imbalance between LED string voltage drops and/or sink device characteristics. | 01-16-2014 |
20140015425 | LINE VOLTAGE CONTROL CIRCUIT FOR A MULTI-STRING LED DRIVE SYSTEM - A line voltage control circuit for use with a multi-string LED drive system which provides a common line voltage for multiple LED strings that are connected to respective current sink circuits at respective junctions. An error amplifier receives the minimum junction voltage and a reference ‘desired junction voltage’ at respective inputs, and a voltage regulator outputs the line voltage in response to a voltage applied to a feedback input. A comparator toggles an output when the maximum junction voltage (V | 01-16-2014 |
20140015426 | LED DRIVE SYSTEM FOR CONTROLLING AN OFF-CHIP POWER SUPPLY - A LED drive system for controlling an off-chip power supply enables the power supply function to be located ‘off-chip’—i.e., on an IC which is separate from the IC containing the other LED drive system components. The off-chip supply provides a common line voltage for LED strings connected in series with respective current sink circuits at respective junctions, in response to a signal applied to a control input. The system includes a ‘minimum’ circuit which outputs the least of the voltages at the junctions, and an I/O pin which receives a signal that varies with the output of the minimum circuit. When the external supply's control input is coupled to the system's I/O pin, the present system controls the output of the external power supply as needed to provide a desired common line voltage. | 01-16-2014 |
20140028201 | LED STRING WITH A CAPABILITY TO MAINTAIN A CURRENT PATH AND LED UNIT THEREOF - An LED string with a capability to maintain a current path has multiple LED units electrically connected in series. Each of the LED units has a base, a holder, a bridge device, a cover and an LED device. The base has two conductive pads. The holder and the cover are mounted in the base. The bridge device is mounted in the holder. The LED device is mounted in the cover. The bridge device and the LED device are electrically connected in parallel and contact the conductive pads. When the LED device is damaged, the bridge device still contacts the conductive pads. Hence, the bridge device provides a path that allows a current to flow through the conductive pads. | 01-30-2014 |
20140028202 | Dimming way for led - A new dimming way is to change output voltage for LED or OLED lamp corresponding to dimming percentage without turn on and off LED or OLED lamp; The dimming control signal can come from a keyboard, a phase dimmer, a dimmer button or a computer; The dimming control signal can be sent to controller through PWM signal, phase dimmer or I2C; The output load can be LED lamp or OLED lamp. | 01-30-2014 |
20140035471 | CURRENT DISTRIBUTOR - A current distributor includes a plurality of current adjustment units and a reference voltage adjustment unit. The plurality of current adjustment units is for distributing currents flowing through plural sets of light emitting diodes. The reference voltage adjustment unit is coupled to the plurality of current adjustment units for controlling the plurality of current adjustment units according to a reference voltage. | 02-06-2014 |
20140035472 | REDUCING LUMEN VARIABILITY OVER A RANGE OF COLOR TEMPERATURES OF AN OUTPUT OF TUNABLE-WHITE LED LIGHTING DEVICES - A system provides white light having a selectable spectral characteristic (e.g. a selectable color temperature, delta uv, and intensity) using a combination of sources (e.g. LEDs) emitting light of three, four, five, or six different characteristics, for example, one or more white LEDs, and one or more LEDs of each of three primary colors, plus cyan and royal blue. A controller maintains a desired spectral characteristic, e.g. for white light at a selected point on or within a desired range of the black body curve. In addition, the controller provides selectable adjustments for values of the spectral characteristics, while maintaining substantially constant overall output intensity for the light output of White LEDs, thereby achieving Maximum Utilization. | 02-06-2014 |
20140042917 | LED DEVICE, LED DRIVING CIRCUIT AND METHOD - A light-emitting diode (LED) driving circuit includes an LED control circuit and a power stage circuit. The LED control circuit shifts an input pulse width modulation (PWM) signal toward a higher frequency direction in a frequency domain to generate an output PWM signal having a duty cycle substantially the same as a duty cycle of the input PWM signal. The power stage circuit outputs an LED driving current according to the output PWM signal. | 02-13-2014 |
20140042918 | LED DRIVING DEVICE AND LED DRIVING METHOD USING SAME - In various aspects of the present subject matter, a light emitting diode (LED) driving device and an LED driving method using the same are disclosed. | 02-13-2014 |
20140049170 | Method and Apparatus for LED Lighting - A LED lighting method and a LED lighting device has been disclosed, a method for improving the luminous efficiency of LED, an integrating method of a LED lighting circuit and a LED lighting integrated chip are provided, which use the negative power characteristics of the constant current diode CRD to enable the power supply current to drive the LED to emit light and illuminate after affecting by the constant current effect of the constant current diode CRD. The constant current diode CRD and an LED light module group are packaged and integrated into a chip to form an LED light module group integrated chip. The constant current diode CRD has negative power characteristic, which enables the LED light module group integrated chip to have the negative power physical characteristic, and when the operating temperature of the LED light module group integrated chip is too high, the constant current diode will automatically reduce circuit power input in order to reduce the temperature of the LED light module group integrated chip to protect it from lumens depreciation due to the overheating. | 02-20-2014 |
20140055044 | LED CURRENT CONTROL SYSTEM FOR LED DRIVE SYSTEM WITH MULTIPLE DIMMING INPUTS - A LED current control system for use with an LED drive system which includes LED strings connected in series with respective current sink circuits, each of which causes a current to be conducted by the LED string to which it is connected. The drive system includes 3 or more ‘dimming’ inputs with which the LED string currents can be adjusted. The LED current control system comprises at least one minimum circuit which receives two or more dimming inputs and produces an output which is proportional to the lesser of the inputs, a multiplier circuit which receives the outputs of the minimum circuits and at least one other dimming input and produces an output ILED which is proportional to the product of the received signals, and a sink control circuit which receives ILED and controls the current sink circuits such that the string currents vary with ILED. | 02-27-2014 |
20140062314 | CURRENT SHARING CIRCUIT FOR LED LIGHTING - Techniques and corresponding circuitry are disclosed for providing active current sharing in lighting applications. The techniques can be used, for instance, to minimize or otherwise reduce current differences between parallel LED strings of a given lighting apparatus while further minimizing or otherwise reducing power dissipation. In some embodiments, an active current sharing circuit is provided that includes a series-pass sub-circuit, such as a transistor or transistor circuit (or other active series-pass circuit), for each LED string. In addition, each string has a current sense sub-circuit for sensing current of that string. A monitor and control sub-circuit operates in conjunction with the series-pass sub-circuit to maintain the sensed current equal to a common reference level. In some embodiments, the common reference level is controlled to maintain the lowest series-pass element voltage close to or equal to zero volts (−0.25VDC to +0.25VDC). | 03-06-2014 |
20140062315 | WIRING BOARDS FOR ARRAY-BASED ELECTRONIC DEVICES - In accordance with certain embodiments, lighting systems include one or more lightsheets each including a plurality of strings of light-emitting elements, control elements, and power conductors for supplying power to the light-emitting elements and control elements. | 03-06-2014 |
20140062316 | WIRING BOARDS FOR ARRAY-BASED ELECTRONIC DEVICES - In accordance with certain embodiments, lighting systems include one or more lightsheets each including a plurality of strings of light-emitting elements, control elements, and power conductors for supplying power to the light-emitting elements and control elements. | 03-06-2014 |
20140062317 | LED DRIVING DEVICE AND METHOD FOR DRIVING AN LED BY USING SAME - The present invention relates to an LED driving device and a method for driving an LED by using the same. According to one aspect of the present invention, an LED driving device includes: a light source unit including first to nth LED groups sequentially connected in series; and a driving control unit having first to nth input terminals respectively connected to output terminals of the first to nth LED groups for controlling each of first to nth input currents which are inputted to the first to nth input terminals through first to nth current sensing signals generated by reflecting the first to nth input currents at predetermined ratios. | 03-06-2014 |
20140070710 | LIGHTING COMPONENT WITH INDEPENDENT DC-DC CONVERTERS - The present disclosure relates to a lighting component with multiple DC-DC converters. Each of the DC-DC converters is used to independently drive a corresponding string of LEDs. In general, rectifier circuitry receives an AC power signal and generates a rectified signal, which is provided to first and second converter circuitries. The first converter circuitry converts the rectified signal into a first drive voltage for a first string of LEDs and provides a first drive current for the first string of LEDs based on a first drive current control signal. Similarly, the second converter circuitry converts the rectified signal into a second drive voltage for a second string of LEDs and provides a second drive current for the second string of LEDs based on a second drive current control signal. | 03-13-2014 |
20140091718 | Power Converter with an Inductor-Inductor-Capacitor Stage and Method of Operating the Same - A power converter including an inductor-inductor-capacitor stage and method of operating the same. In one embodiment, the power converter includes an inductor-inductor-capacitor (LLC) stage coupled to an input of said power converter. The power converter also includes a controller configured to control a switching frequency of the LLC stage as a function of an input voltage of the power converter. | 04-03-2014 |
20140103820 | Boost Converter of Driver Circuit With Thermal Compensation - A circuit for providing thermal compensation for a driver circuit used to drive light emitting diodes (LEDs) is provided. The driver circuit can include a rectifier circuit configured to rectify an AC power source into a DC power source providing a DC source voltage. The driver circuit can further include a boost circuit configured to boost the DC source voltage to provide a drive voltage for driving the light emitting diodes. The boost circuit can include a switching element that is controlled based at least in part on a current sense circuit having a sense transistor. A thermal tracking transistor is provided as part of the reference to the sense circuit. | 04-17-2014 |
20140103821 | LIGHTING DEVICE AND VOLTAGE REDUCTION METHOD THEREOF - The disclosure provides a lighting device and a voltage reduction method thereof, wherein the lighting device comprises: an AC power supply generator for generating an AC power source to supply power to other accessories and circuits in the lighting device; m load components, every two adjacent load components forming one head common connection point and one end common connection point respectively for each load component from head to end alternatively; and (m−1) current balancing cells each respectively connected between one head common connection point or one end common connection point and one of two output terminals of the AC power supply generator; wherein the m load components comprise (m−n) low impedance load components therein. The present application can reduce the output voltage of the AC power supply generator with lower cost. | 04-17-2014 |
20140117864 | WHITE AC LED - A multi-color white LED which can be driven by a single current, and more particularly, to the use of a specific ratio of numbers of different color LEDs to obtain a specific desired color while running all of them at the same current. | 05-01-2014 |
20140125235 | CIRCUIT FOR DRIVING LEDS - A circuit is disclosed for driving a plurality of LED strings from an AC supply and arranged to, in use, drive current through a series arrangement of a plurality N of the LED strings when the AC voltage is sufficient to drive the plurality N of the LED strings: the circuit comprising a first current source configured to be switchably connected to a one end of said series arrangement of N LED strings; a series combination of a second current source and a heat dissipater, wherein the series combination of the second current source and the heat dissipater is arranged in parallel with the first current source; and a current balancer for balancing the current through the first current source and the second current source. A driver for such a circuit is also disclosed. | 05-08-2014 |
20140132163 | HIGH-VOLTAGE LED MULTICHIP MODULE AND METHOD FOR ADJUSTING AN LED MULTICHIP MODULE - An LED multichip module may include a plurality of LED chips, which have electrical terminals and are connected in series via electrical connections, and have a designated operating voltage, wherein at least one short-circuiting connection is provided, which connects two of the terminals or connections electrically conductively to one another, and the short-circuiting connection bypasses at least one of the LED chips or a resistor, with the result that the operating voltage is in the range of between 150 V and 350 V. | 05-15-2014 |
20140159591 | Direct-Current Power Supply Device and Lighting Apparatus - According to one embodiment, a direct-current power supply device and an LED lighting apparatus are provided in which arc discharge is more certainly detected and versatility can be improved. The direct-current power supply device includes a constant-current circuit, a voltage detection unit, a current detection unit and a control unit. The constant-current circuit is supplied with power by an external power supply and outputs a constant current to an LED. The voltage detection unit detects one of a load voltage and an electric quantity corresponding to the load voltage. The current detection unit detects one of a load current and an electric quantity corresponding to the load current. The control unit reduces or stops the output current from the constant-current circuit if a detected value of the voltage detection unit increases and a detected value of the current detection unit does not at least increase. | 06-12-2014 |
20140167628 | ILLUMINATING DEVICE - Disclosed is an illuminating device which has: a first illuminating lamp which is disposed at a first predetermined position and is identifiable; a second illuminating lamp which is disposed at a second predetermined position having a predetermined relationship with the first predetermined position and is identifiable; a determining means which determines the mutual relationship between the first illuminating lamp and the second illuminating lamp; and a transmitting means which transmits identifiable control signals to the first illuminating lamp and the second illuminating lamp, respectively, so as to achieve the determination made by the determining means. | 06-19-2014 |
20140175993 | WIRING BOARDS FOR ARRAY-BASED ELECTRONIC DEVICES - In accordance with certain embodiments, lighting systems include one or more lightsheets each including a plurality of strings of light-emitting elements, control elements, and power conductors for supplying power to the light-emitting elements and control elements. | 06-26-2014 |
20140184085 | ELECTRONIC DEVICE AND CONTROL METHOD THEREOF - According to one embodiment, an electronic device includes, a light source, LED protective elements, a detecting module, a determining module, and a setting module. The light source includes LED elements connected in series. The power supplying module configured to supply a drive voltage to the light source. The LED protective elements connected to the respective LED elements in parallel. The detecting module configured to detect a fluctuation in the drive voltage supplied to the light source and the LED protective elements. The determining module configured to determine that the fluctuation in the drive voltage detected by the detecting module has an abnormal value. | 07-03-2014 |
20140203714 | LED LIGHTING APPARATUS FOR USE WITH AC-OUTPUT LIGHTING BALLASTS - A lighting apparatus includes at least one light emitting diode (LED) and a passive resonant converter circuit having an output coupled to the at least one LED and an input configured to be coupled to a ballast that produces an AC output. The passive resonant converter circuit may include a combination of a passive rectifier circuit, such as a passive diode bridge, and a resonant circuit, such as a CL resonant circuit. An input of the passive rectifier circuit may be configured to be coupled to the ballast and the resonant circuit and the at least one LED may be coupled to an output of the passive rectifier circuit. At least a portion of the passive resonant converter may be packaged with the at least one LED in a lamp and all or a portion of the passive resonant converter circuit may be packaged as a module or other unit for use with a lamp. | 07-24-2014 |
20140203715 | CONTROLLER, A DRIVER CIRCUIT AND A METHOD FOR CONTROLLING A DIMMABLE LED LIGHTING CIRCUIT, AND A DIMMABLE LED LIGHTING CIRCUIT - A controller for a for a dimmable LED lighting circuit is disclosed, the controller comprising: an LED current controller configured to set a current of a constant current source in dependence on a conduction angle of the phase-cut dimmer; a first feedback circuit configured to control the circuit's power converter in dependence on the constant current source by adjusting an output of the power converter; and a second feedback circuit configured to control a supplementary output load arranged in parallel with the series arrangement of the constant current source and plurality of LEDs, wherein the second feedback circuit is operable to adjust the supplementary output load faster than the first feedback circuit adjusts the output of the power convertor. | 07-24-2014 |
20140239824 | LED CONTROLLING CIRCUIT WITH HIGH POWER FACTOR AND AN LED LIGHTING DEVICE - The present invention is suitable for an LED controlling field, and provides an LED controlling circuit with high power factor and an LED lighting device. In the present invention, by using an LED current controlling circuit with high power factor comprising a plurality of output current controlling modules, a resistor Re and a reference voltage generating module, the LED groups is driven accordingly in a piecewise manner to be on and a current flows through the LED groups according to the input voltage of the LED strip, without sampling the input voltage of the LED strip by a sampling circuit and without increasing the number of high cost component, which increase the utilization of the LED, the power factor of the whole LED controlling circuit and the efficiency of the system, thereby solving the problem of low power factor and low efficiency system existing in the prior art. | 08-28-2014 |
20140252965 | Methods of Operating Switched Mode Power Supply Circuits Using Adaptive Filtering and Related Controller Circuits - A method of operating a switched mode power supply circuit can be provided by determining an error in a control signal for the switched mode power supply circuit. The error can be compared to an error threshold value to provide a filtering selection. The error can be adaptively filtered of based on the filtering selection to provide a selected filtering and the error can be filtered using the selected filtering. | 09-11-2014 |
20140265884 | ELECTRICAL LOAD DRIVING APPARATUS - An electrical load driving apparatus, comprising a current distribution apparatus having a power source arranged to deliver an input current into a plurality of branches such that the input current is distributed into a plurality of individual branch currents, wherein each of the plurality of branches includes an inductive arrangement arranged to form an inductive coupling with an associated inductive arrangement of at least one other associated branch, and a plurality of output loads connect to each of the associated branches of the current distribution apparatus. | 09-18-2014 |
20140300282 | Control of the Intensity of a LED Lighting System - There is described a system and method for controlling the intensity of a lighting system for vehicles comprising light emitting diodes mounted on printed circuit boards (PCBs). The method comprises sending a first modulation signal to the lighting modules from a master controller upon detection of a presence of power from a power source by the master controller; and sending a second modulation signal to the lighting modules from the master controller upon detection of an absence of power from a power source by the master controller. The first modulation signal corresponds to a first LED intensity and the second modulation signal corresponds to a second LED intensity lower than the first light intensity. | 10-09-2014 |
20140312785 | LIGHT EMITTING DIODE LIGHTING DEVICE - A lighting device having an electrical circuit includes an LED having a variable illuminating resistance. The electrical circuit is configured for energizing the LED light source with a source of electrical power. The LED light source is energized with an effective power such that the LED light source functions in accordance with a targeted illuminating resistance. The circuit includes one or more components for monitoring circuit parameters, calculating the illuminating resistance of the LED and for changing the effective power applied to the LED light source in response to a relationship between the illuminating resistance and the targeted illuminating resistance. The change in effective power made by the circuit is for returning the illuminating resistance to a predetermined relationship with the targeted illuminating resistance. | 10-23-2014 |
20140312786 | LED LIGHT STRIP COMPRISING TWO OR MORE INDEPENDENT CIRCUITS MEETING SEPARATE POWER CONSUMPTION AND ILLUMINATION OUTPUT REQUIREMENTS - A vending machine includes a controller coupled to at least one light emitting diode (LED) light strip mounted within the vending machine and illuminating an interior thereof. The LED light strip includes an input terminal that receives one or more signals corresponding to a mode of the LED light strip, an LED mounting board supports a plurality of LED chips forming a plurality of independent circuits each including a serially-connected subset of the LED chips, and electrical circuit components (resistor, input terminal, and/or output terminal) that cause the respective circuit to function independently from remaining circuits in the LED light strip. The controller selectively powers one or more of the independent circuits in the LED light strip to meet either a power consumption requirement or an illumination output specification, leaving off any remaining independent circuits not corresponding to the specified mode. | 10-23-2014 |
20140312787 | DIMMABLE LED LIGHTING CIRCUITS, CONTROLLERS THEREFOR AND A METHOD OF CONTROLLING A DIMMABLE LED LIGHTING CIRCUIT - Controllers ( | 10-23-2014 |
20140312788 | ILLUMINATION DEVICE CONTROL SYSTEMS AND METHODS - In various embodiments, a control system for an electronic circuit iteratively applies voltage to and senses current from a load to regulate operation of the load. | 10-23-2014 |
20140320030 | PROGRAMMABLE CONTROLLER OF LIGHT STRING - The present invention relates to a programmable controller of light string characterized in that the controller of light string is provided with a bluetooth receiver and a main IC electronically connected with the bluetooth receiver so as to further corporate with a smart phone to download a new song or music and then transmit it through the bluetooth of the smart phone to the bluetooth receiver. The rhythm of the new song or music is converted to signals by the main IC of the controller for controlling the flashing of all light bulbs at the corresponding rhythm. Thereby the light string is able to change the flashing pattern of light bulbs in association with the update of a song or music that varies the flashing effect of light string in a broad range of variety. | 10-30-2014 |
20140333215 | MULTI-SEGMENT LED DRIVING CIRCUIT - Disclosed is a multi-segment LED driving circuit used in an AC operating mode for outputting a drive current to drive a plurality of serially connected LED strings. The LED driving circuit includes at least one detection part, at least one comparison part and at least one adjusting part. The detection part detects an input voltage and an output voltage at both ends of each string and its next string to form a detected value provided for the comparison part to compare the detected value with a reference value to turn on or off the adjusting part so as to control the strings through which the drive current passes and then sequentially drives the strings to emit light. The LED driving circuit can adjust the load of the circuit immediately based on the change of voltage value of the AC power to ensure the stability of the drive current. | 11-13-2014 |
20140333216 | MULTI-STRING DIMMABLE LED DRIVER - An apparatus includes a first LED driver configured to control a first string of LEDs, a second LED driver configured to control a second string of LEDs, a third LED driver configured to control a third string of LEDs, and a control circuit configured to receive a control signal and to control the first, second, and third LED drivers so that the first, second, and third strings of LEDs cooperate in producing light according to the control signal and a color curve. | 11-13-2014 |
20140346959 | Circuit Arrangement and Method for Operating an LED Chain on AC Voltage - A circuit arrangement for operating a chain comprising at least one light emitting diode on an AC voltage, in particular mains voltage, comprising a rectifier with an input circuit for drawing the AC voltage and an output circuit, into which a rectified AC voltage is output. An energy store is provided in the output circuit, in particular a storage capacitor, to which the LED chain can be connected in a parallel circuit. A current controller interrupts, during operation, the charging of the storage capacitor each time the current in the output circuit has risen to a specific threshold current, and enables charging again when the voltage in the output circuit has then fallen to a specific threshold voltage. | 11-27-2014 |
20140361694 | Circuit and Method for Current-Based Analog Dimming of Light Emitting Diode Illuminators, with Improved Performance at Low Current Levels - By diverting a small amount of current from a string of LED(s) powered by a LED driver at low current levels in a process of dimming the LED string, performance of the LED string light emission is improved. | 12-11-2014 |
20140361695 | LED LIGHTING DEVICE - The purpose of the invention is to obtain, with a simple circuit configuration, an LED illumination device having an LED column driven by a pulsating voltage, capable of lighting with little flicker, and also having lighting control capability. The LED illumination device ( | 12-11-2014 |
20150028752 | CONTROL CIRCUIT OF LIGHT EMITTING DIODES AND OPERATION METHOD OF A CONTROL CIRCUIT OF LIGHT EMITTING DIODES - A control circuit of light emitting diodes is used for driving at least one series of light emitting diodes. The control circuit includes a current setting pin, a driving current generator, a regulator circuit, and an adjuster. A reference current flows through the current setting pin. The driving current generator is used for generating a driving current flowing through the series of light emitting diodes according to the reference current. The adjuster generates an adjustment voltage according to the reference current. Then, the regulator circuit generates a supply voltage to drive the series of light emitting diodes, and regulates a voltage of a first terminal of the series of light emitting diodes at a target voltage according to the adjustment voltage. The target voltage is increased with decrease of the driving current when the driving current is less than a first predetermined current. | 01-29-2015 |
20150035442 | Controlling Current Flowing Through LEDs in a LED Light Fixture - An alternating current (“AC”)-powered light emitting diode (“LED”) driver is described herein for driving one or more arrays of series-connected LEDs. The LED driver includes a first transistor that includes a collector-emitter path connected in series with at least one LED of an array of series-connected LEDs. The LED driver also includes a second transistor configured to selectively activate the first transistor based on a level of current through the array of series-connected LEDs. The array of series-connected LEDs has a turn-on voltage. | 02-05-2015 |
20150061513 | MULTICHIP PACKAGE STRUCTURE - A multichip package structure includes a metal substrate, a circuit substrate and a light-emitting module. The metal substrate has a first mirror plane area and a second mirror plane area. The circuit substrate is disposed on the metal substrate. The circuit substrate includes a plurality of first conductive pads, a plurality of second conductive pads, a first passing opening for exposing the first mirror plane area, and a second passing opening for exposing the second mirror plane area. The light-emitting module includes a plurality of light-emitting units disposed on the first mirror plane area. Each light-emitting unit includes a plurality of LED chips disposed on the first mirror plane area. The LED chips of each light-emitting unit are electrically connected between the first conductive pad and the second conductive pad in series. Thus, the heat-dissipating efficiency and the light-emitting effect of the multichip package structure can be increased. | 03-05-2015 |
20150069922 | CURRENT ROUTING TO MULTIPLE LED CIRCUITS - An illumination module includes a plurality of Light Emitting Diodes (LEDs) located in different zones to preferentially illuminate different color converting surfaces. The flux emitted from LEDs located in different zones may be independently controlled by selectively routing current from a single current source to different strings of LEDs in the different zones. In this manner, changes in the CCT of light emitted from LED based illumination module may be achieved. | 03-12-2015 |
20150084526 | SYSTEMS AND METHODS FOR CURRENT MATCHING OF LED STRINGS - System and method are provided for regulating a string current flowing through a string of one or more light emitting diodes. A system controller includes a first controller terminal, a second controller terminal and a third controller terminal. The first controller terminal is coupled to a base terminal of a bipolar junction transistor, the bipolar junction transistor further including an emitter terminal and a collector terminal, the collector terminal being connected to the string of one or more light emitting diodes. The second controller terminal is coupled to the emitter terminal of the bipolar junction transistor and to a first resistor terminal of a resistor associated with a resistance. The third controller terminal is coupled to a second resistor terminal of the resistor. In addition, the system controller is configured to receive a reference voltage, receive an emitter voltage, and output a base current. | 03-26-2015 |
20150091453 | LED LAMP STRING - A novel LED lamp string is provided whose LED lamps are protected from current/voltage fluctuation. The gist of the present invention lies in the configuration of a number of resistors series-connected to the LED lamps along the cable of the LED lamp string. With the resistors, the current and voltage along the cable are stable with no sudden high or low, and therefore the LED lamps have longer operational lives. | 04-02-2015 |
20150108906 | WIRING BOARDS FOR ARRAY-BASED ELECTRONIC DEVICES - In accordance with certain embodiments, lighting systems include one or more lightsheets each including a plurality of strings of light-emitting elements, control elements, and power conductors for supplying power to the light-emitting elements and control elements. | 04-23-2015 |
20150108907 | WIRING BOARDS FOR ARRAY-BASED ELECTRONIC DEVICES - In accordance with certain embodiments, lighting systems include one or more lightsheets each including a plurality of strings of light-emitting elements, control elements, and power conductors for supplying power to the light-emitting elements and control elements. | 04-23-2015 |
20150115809 | POWER LINE COMMUNICATION FOR LIGHTING SYSTEMS - Techniques are provided for bi-directional communication between a power supply and one or more light engines (and/or other lighting system components) via the existing power lines so that no additional communication wires are needed. In particular, the power supply can transmit information by modulating its output (voltage or current) and the light engine (or other lighting componentry, such as a sensor) can communicate back by modulating how much power it draws from the power supply. Any suitable type of modulation scheme can be used, and a master-slave arrangement can be used to control the bi-directional communication if so desired, so as to avoid multiple devices communicating over the power line communication channel at the same time. Other embodiments allow a multiple simultaneous communications over the power line communication channel. | 04-30-2015 |
20150115810 | LED DRIVE CIRCUIT - An LED drive circuit includes: a rectifier circuit that outputs a full-wave rectification waveform voltage; a primary LED row that includes a first partial LED row and a second partial LED row; an auxiliary LED row-; a bypass circuit that is connected to part connecting the first partial LED row and the second partial LED row and that returns current from the first partial LED row to the rectifier circuit; and a current limiting circuit that limits the current flowing through the auxiliary LED row wherein the primary LED row and the auxiliary LED row are connected in parallel to the rectifier circuit; and the bypass circuit blocks the current passing through the bypass circuit in accordance with the current flowing through the primary LED row, and controls and blocks the current flowing through the auxiliary LED row. | 04-30-2015 |
20150123549 | LED LIGHTING SYSTEM - The invention relates to a LED lighting system comprising a power supply circuit and at least one LED module. The power supply circuit comprises input terminals (K | 05-07-2015 |
20150130360 | COMPACT CONVERTER PLUG FOR LED LIGHT STRINGS - Disclosed is a compact converter plug that can be used with LED lighting strings. The converter plug has a size and shape that is comparable to a standard wall plug and is capable of plugging into a standard wall socket. The converter plug is waterproof and can be easily assembled. A unique converter circuit is utilized that is compact and highly efficient. Monitoring is performed by a transformer coil that generates a monitoring signal. The converter is controlled by controlling the modulation frequency of a direct current signal using a controller. | 05-14-2015 |
20150145424 | LCD BACKLIGHT DRIVING CIRCUIT AND LIQUID CRYSTAL DEVICE - A LED backlight driving circuit is disclosed. The LED backlight driving circuit includes a driving module, a detecting module, and an adjusting module. The driving module receives a control voltage generated by a voltage control module, receives a feedback voltage generated by a feedback voltage module, and generates driving signals to a LED unit. The detecting module generates adjusting signals for the adjusting module according to a detected value of the driving signals. The adjusting module controls the feedback voltage according to the adjusting signals generated by the detecting module so as to adjust the driving signals. In this way, not only the current precision within the LED unit is enhanced, but also the light source is kept stable. Also, the life cycle of the LED units is also increased. In addition, a LED backlight driving circuit includes the above LED backlight driving circuit is also disclosed. | 05-28-2015 |
20150145425 | Cascode-type Dimming Switch Using A Bipolar Junction Transistor For Driving A String Of Light Emitting Diodes - The invention comprises a dimming switch for use with a string of light emitting diodes (LEDs). The dimming switch comprises a bipolar junction transistor (BJT) driven in a cascode scheme. The dimming switch also comprises circuitry to offset the current that drives the base of the BJT to provide a controlled amount of current to the LEDs when the dimming input signal is high. | 05-28-2015 |
20150296582 | LED LUMINESCENCE APPARATUS - An LED luminescence apparatus is provided, which includes a rectifying unit rectifying an AC voltage and generating a rectified voltage; a plurality of LEDs connected in series to an output terminal of the rectifying unit; a plurality of switches having drain terminals connected to cathodes of the plurality of LEDs, respectively; and a switch control unit sensing current through a plurality of resistors connected to source terminals of the plurality of switches, respectively, comparing the sensed current with a set reference current, and outputting a voltage corresponding to a difference between the sensed current and the set reference current to a gate terminal of each of the plurality of switches. | 10-15-2015 |
20150296584 | HIGH UTILIZATION LED DRIVER - A high utilization AC-line input light emitting diode driver that can automatically transition to the most favorable configuration of the LEDs based on the instantaneous line voltage input. | 10-15-2015 |
20150312979 | RADIO TRANSMISSION BETWEEN MODULES IN A POTENTIAL-SEPARATED LED CONVERTER - The invention relates to an operating unit ( | 10-29-2015 |
20150326117 | ILLUMINATION DEVICE CONTROL SYSTEMS AND METHODS - In various embodiments, a control system for an electronic circuit iteratively applies voltage to and senses current from a load to regulate operation of the load. | 11-12-2015 |
20150341994 | LED CIRCUIT AND DRIVING METHOD THEREOF - An LED circuit includes a series of LED devices, a power supply circuit and a signal control circuit. Each of the LED devices includes an LED unit and an integrated circuit unit having a specific serial number and receiving an electrical parameter. The signal control circuit is coupled to the power supply circuit and the series of LED devices, and has a loaded status. The signal control circuit changes the loaded status in response to a control signal so as to cause the electrical parameter to have a variation, the variation of the electrical parameter generates a signal code having an information, all the integrated circuit units receive the signal code, and a specific LED unit will be driven by a corresponding integrated circuit unit when the signal code corresponds to the specific serial number of the corresponding integrated circuit unit. | 11-26-2015 |
20150341998 | MULTIPLEXED ULTRA-LOW-POWER LED LUMINAIRE - The present invention relates to a luminaire based on the same optical principle as the cinema, in which only one image is presented at any given instant of time but the image appears to be in constant movement. According to the invention, each LED lights up simultaneously for an instant of time in a sequential manner, as with television screens. The LED luminaire of the invention includes a configuration of electronic elements in a circuit which controls the lighting of the LED array and which also includes a PIC microcontroller, a CMOS multiplexer and an operational amplifier that can be used to improve the power consumption of the luminaire, lighting control and the lighting quality of the LED luminaire. | 11-26-2015 |
20150351171 | LED RETROFIT LAMP WITH SHUNT CAPACITORS ACROSS RECTIFIER DIODES FOR USE WITH A BALLAST - The invention relates to LED replacement lamp suitable for operation with a high frequency fluorescent lamp ballast, comprising—a LED load (LS) comprising a series arrangement of LEDs,—a first lamp end circuit comprising—a first lamp pin (LP | 12-03-2015 |
20150351187 | LIGHTING FIXTURE PROVIDING VARIABLE CCT - The present disclosure relates to a lighting fixture that is capable of providing white light over an extended range of correlated color temperatures. | 12-03-2015 |
20150366028 | LIGHT EMITTING DEVICE DRIVER CIRCUIT AND DRIVING METHOD OF LIGHT EMITTING DEVICE CIRCUIT - The present invention discloses a light emitting device driver circuit and a driving method of a light emitting device circuit. The light emitting device driver circuit is for driving a light emitting device circuit with plural light emitting devices connected in series. The light emitting device driver circuit determines a number of the conductive light emitting devices according to a rectified input voltage. The light emitting device driver circuit includes: a switch module, a current source circuit, and a total harmonic distortion (THD) compensation circuit. The THD compensation circuit generates an adjustment current according to the rectified input voltage. The current source circuit provides a light emitting device current to the light emitting device circuit according to the adjustment current, such that the THD is reduced. | 12-17-2015 |
20150369724 | PHOTOACOUSTIC IMAGING DEVICE - A photoacoustic imaging device includes a connector that connects a light source device, a booster circuit that includes a capacitor and that performs a boosting operation that applies voltage to the light source device via the connector, a discharge circuit connected to both poles of the capacitor of the booster circuit and that performs a discharge operation that discharges a charge stored in the capacitor, and a discharge circuit controller that controls the discharge circuit to perform the discharge operation when the connector and the light source device are disconnected or when the power source of the photoacoustic imaging device main body is off. | 12-24-2015 |
20150373795 | LED SYSTEM WITH TWO WIRE CONTROL CIRCUIT - An LED module can be powered by two conductors and the LED module includes a constant current driver. The constant current driver is configured to provide a predetermined current so long as the input voltage provided on the two conductors exceeds a predetermined level. The constant current driver powers an LED string supported by the LED module and can adjust the current to the LED string based on an input signal. A conversion circuit converts the input voltage to an input signal and provides that input signal to the constant current driver so that dimming can be provided while only using two conductors to provide power. | 12-24-2015 |
20150373807 | LIGHT EMITTING DIODE DRIVING APPARATUS CAPABLE OF DETECTING WHETHER CURRENT LEAKAGE PHENOMENON OCCURS ON LED LOAD AND LIGHT EMITTING DIODE DRIVING METHOD THEREOF - A light-emitting-diode (LED) driving apparatus and an LED driving method suitable for driving an LED load are provided. The LED driving apparatus includes a driving circuit, a feedback circuit, and a control chip. The driving circuit provides a driving voltage by means of boost converting or buck-boost converting to one terminal of the LED load according to a pulse-width-modulation (PWM) driving signal. The feedback circuit generates a feedback voltage according to a voltage on the other terminal of the LED load. The control chip generates the PWM driving signal and adjusts the duty cycle of the PWM driving signal in response to the feedback voltage. If the control chip determines the PWM driving signal with a maximum duty cycle continues being output over a preset period of time, the control chip determines that the current leakage phenomenon occurs on the LED load and stops generating the PWM driving signal. | 12-24-2015 |
20150373811 | DETECTION OF AN LED MODULE - The invention relates to an LED module ( | 12-24-2015 |
20160007419 | LED Illuminator Apparatus, Using Multiple Luminescent Materials Dispensed Onto An Array of LEDs, For Improved Color Rendering, Color Mixing, and Color Temperature Control - An LED array includes three or more strings of bare LEDs mounted in close proximity to each other on a substrate. The strings of LEDs emit light of one or more wavelengths of blue, indigo and/or violet light, with peak wavelengths that are less than 490 nm. Luminescent materials deposited on each of the LED chips in the array emit light of different wavelength ranges that are of longer wavelengths than and in response to light emissions from the LED chips. A control circuit applies currents to the strings of LEDs, causing the LEDs in the strings to emit light, which causes the luminescent materials to emit light. A user interface enables users to control the currents applied by the control circuit to the strings of LEDs to achieve a Correlated Color Temperature (CCT) value and hue that are desired by users, with CIE chromaticity coordinates that lie on, or near to the black body radiation curve. Preferably a transparent material is dispensed on the substrate between the LED semiconductor chips to substantially surround the LED semiconductor chips. Thereafter at least one layer containing luminescent materials is applied on the LED semiconductor chips and the transparent material. | 01-07-2016 |
20160014859 | LED LIGHTING APPARATUS | 01-14-2016 |
20160021710 | LIGHT EMITTING DIODE DRIVING APPARATUS - A light emitting diode driving apparatus includes a first light emitting diode driving unit and a second light emitting diode driving unit. The first light emitting diode driving unit includes a plurality of first light emitting diode driving subunits in series. The second light emitting diode driving unit includes a plurality of second light emitting diode driving subunits in series. The first light emitting diode driving unit and the second light emitting diode driving unit are electrically connected in parallel to receive a direct current power. A light signal is transmitted between the first light emitting diode driving unit and the second light emitting diode driving unit in series. | 01-21-2016 |
20160037591 | DESIGN AND METHODS TO PACKAGE AND INTERCONNECT HIGH INTENSITY LED DEVICES - Design and methods to package and interconnect high intensity LED devices employ tabless LED devices adjoined in alternating polarities, such that an anode of one LED device is electrically connected to a cathode of an adjoining LED device to create a series. Electrical and positional connections are affected by connectors attached to the anode or cathode by means of fasteners, thermally conductive insulators optionally present. | 02-04-2016 |
20160044753 | SMOOTH BRIGHTNESS ADJUSTMENT FOR COLOR-TUNABLE LIGHT SOURCE MODULE - A first sequence of pulses having a high frequency can be modulated using a second sequence of pulses having a lower frequency. The pulse width of the second sequence of pulses can be perturbed from a nominal pulse width on a per-pulse basis, within a perturbation range corresponding to the pulse period of the first sequence of pulses. In one application, the resulting output can be used to drive LEDs. In some instances, two or more channels of LEDs of different colors can be supported, with the pulse width of the first pulse sequence being selected per-channel based on a desired light color and the nominal pulse width of the second pulse sequence being selected for all channels based on a desired brightness. | 02-11-2016 |
20160057828 | LIGHTING APPARATUS USING SERIES-CONNECTED CURRENT SOURCES AND METHODS OF OPERATING SAME - An apparatus includes a plurality of series-connected current control circuits configured to control a current therethrough responsive to at least one current reference signal and to be coupled in parallel with a load, such as a string of LEDs. The apparatus further includes a voltage control circuit configured to control respective voltages across respective ones of the current control circuits. In some embodiments, the voltage control circuit may be configured to individually adjust responses of the current control circuits responsive to the voltages across the current control circuits. In further embodiments, the voltage control circuit may include respective voltage limiters coupled across respective ones of the current control circuits. | 02-25-2016 |
20160066382 | LIGHT EMITTING APPARATUS COMPRISING INDIVIDUALLY CONTROLLED LIGHT EMITTING CIRCUITS ON AN INTEGRATED CIRCUIT - Various aspects of a light emitting apparatus include an integrated circuit having several electrically coupled light emitting circuits. The integrated circuit includes several control lines to control the light emitting circuits. Each of the control lines is configured to provide individual control for a different one of the light emitting circuits from a source remote to the integrated circuit. | 03-03-2016 |
20160073462 | LED DRIVING DEVICE AND METHOD FOR IMPROVING HARMONIC CURRENT DISTORTION ON A LED DRIVING DEVICE - A LED driving device is provided. The LED driving device includes a multi-segment linear LED driver, first current-compensating device and second current-compensating device. The LED driving device is used to drive a LED device which is composed by a plurality of serial LED modules. The multi-segment linear LED driver selectively provides a first path to a first LED module of the LED modules for flowing a first constant current, or provides a second path to the first LED module and a second LED module of the LED modules for flowing a second constant current. When the first path is provided, first compensating current flows through the first current-compensating device. When the second path is provided, the first current-compensating device stops conducting the first compensating current. When the second path is provided, second compensating current flows through the second current-compensating device. | 03-10-2016 |
20160077536 | Power Converter - Control circuit for a power converter that converts an input voltage into an output voltage is disclosed. The control circuit comprises a power switch; a power switch driver coupled with the power switch to control the switching state of the power switch so as to provide the output voltage at an output port of the power converter, the output port for coupling with a first terminal of a load; a load port for coupling with a second terminal of the load; a switching element coupled with the load port to selectively connect the load port to ground; and operating voltage supply means coupled with the load port, for providing an operating voltage to the control circuit. | 03-17-2016 |
20160081145 | LED LIGHTING CIRCUIT - The invention describes a lighting circuit ( | 03-17-2016 |
20160088698 | Method and Circuit For Driving Light-Emitting Diodes From Three-Phase Power Source - Multiple LEDs connected in series are driven by DC voltage that is provided by a diode rectifier, the diode rectifier being connected to a three-phase power source and converting the three-phase currents from the three-phase power source into the DC voltage that is used to drive the light emitting diodes. In order to reduce ripple in the DC voltage, the series-connected light emitting diodes can be divided into a first set and a second set, and a first constant current source is provided that drives the first set, and a second constant current source is provided that drives the second set. The first and second constant current sources are both connected across the outputs of the rectifier circuit, and operate to drive the respective sets of light emitting diodes in alternation. The capability for dimming can be provided, as well as back-up single phase operation. | 03-24-2016 |
20160088702 | Devices for LED Direct Driver - The device for a LED direct driver comprises a major LED string, a minor LED string set, a pre-regulator, and a direct driver. The major LED string has multiple series-connected LED diodes which has a first end and a second end. The minor LED string set has a first end and a second end, and is formed with multiple series-connected minor strings. The first end of the minor LED string set is connected to the second of the major LED string. Each minor LED string has at least one LED diode. The direct driver is connected to the pre-regulator, the major LED string, and the minor LED string, which is configured to short out selected minor LED strings for ensuring the most efficient LED driving configuration. The pre-regulator provides a regulated voltage output. The regulated voltage output fed to the LED direct driver allows the LED direct driver to provide a constant power output with virtually no output power ripple. | 03-24-2016 |
20160088704 | LOW FLICKER ALTERNATING CURRENT (AC) LED DRIVER - In some embodiments, an apparatus comprising a rectifier that is configured to rectify an Alternating Current (AC) from an AC line to produce a rectified line voltage, at least one resistor operatively coupled to the rectifier, and at least one capacitor operatively coupled to the at least one resistor and ground is disclosed. In some instances, the at least one resistor and the at least one capacitor form a low-pass filter configured to reduce a ripple voltage of the rectified line voltage of the rectifier. In some instances, the at least one resistor and the at least one capacitor are configured to provide a minimum voltage on the at least one capacitor that is high enough to maintain at least one LED conducting current at a minimum level and maintain the at least one LED operational for substantially all of a line cycle of the AC line when the at least one LED is operatively coupled to the at least one capacitor. | 03-24-2016 |
20160088705 | LED DRIVE SYSTEM FOR CONTROLLING AN OFF-CHIP POWER SUPPLY - A LED drive system for controlling an off-chip power supply enables the power supply function to be located ‘off-chip’—i.e., on an IC which is separate from the IC containing the other LED drive system components. The off-chip supply provides a common line voltage for LED strings connected in series with respective current sink circuits at respective junctions, in response to a signal applied to a control input. The system includes a ‘minimum’ circuit which outputs the least of the voltages at the junctions, and an I/O pin which receives a signal that varies with the output of the minimum circuit. When the external supply's control input is coupled to the system's I/O pin, the present system controls the output of the external power supply as needed to provide a desired common line voltage. | 03-24-2016 |
20160095180 | LED Lighting System - An LED lighting system having at least one LED circuit and at least two circuits or drivers capable of receiving an AC voltage at a first frequency and having an output capable of driving the at least one LED circuit, wherein the output of each circuit or driver capable of driving the at least one LED circuit is provided to the at least one LED circuit through a circuit or sensor capable of permitting only a single output from the at least two circuits or drivers be provided to the at least one LED circuit. | 03-31-2016 |
20160113085 | Combined Hybrid and Local Dimming Control of Light Emitting Diodes - An LED backlight controller combines global/hybrid and local brightness/dimming control for an LED backlight illuminator with local regions illuminated by associated LED strings. Global/hybrid brightness/dimming control performs hybrid digital modulation control for a predefined lower range of brightness levels, with string current maintained at a substantially constant level associated with a predefined maximum brightness for the lower range (controlling brightness by adjusting digital modulation, such as PWM duty cycle, up to a maximum), and performs hybrid string current control for a predefined higher range of brightness levels (controlling brightness by adjusting string current). Local dimming control is performed by introducing a local digital modulation signal into a hybrid digital modulation control path for the associated string, so that digital modulation for the associated string is a combination of local digital modulation and global/hybrid digital modulation. | 04-21-2016 |
20160119277 | LIGHT EMITTING DIODE LAMP WITH BURNABLE FUNCTION AND LIGHT EMITTING DIODE LAMP STRING WITH BURNABLE FUNCTION - A light emitting diode lamp with a burnable function includes at least a light emitting diode and a light emitting diode driving apparatus with the burnable function. The light emitting diode driving apparatus is electrically connected to the light emitting diode. The light emitting diode driving apparatus includes a positive contact and a negative contact. The light emitting diode driving apparatus receives a burn start signal sent through the positive contact and a burn address data sent through the positive contact. The light emitting diode driving apparatus is configured to burn the burn address data into the light emitting diode driving apparatus after the light emitting diode driving apparatus receives the burn start signal. | 04-28-2016 |
20160126010 | FLEXIBLE CIRCUIT ASSEMBLY AND METHOD THEROF - An embedded device | 05-05-2016 |
20160126838 | Automatic Reference Generator in Switching Boost Converters - The present document relates to switching DC converters In particular, the present document relates to creating an auxiliary reference voltage for the switching converter to implement a dynamic correction of static load regulation. Main objective of the disclosure is minimizing the regulation error on account of accuracy when non-idealities present in the regulation loop are considered. An additional control loop to monitor the regulated error signal has been added. The additional loop has the purpose to create an auxiliary reference for the boost converter which will be updated (up and down) whenever the regulation exceeds a target threshold. | 05-05-2016 |
20160128139 | SINGLE LED SHORT DETECTION IN MULTICHANNEL LED - A method and circuit are described in which a maximum voltage is determined from among a plurality of series load voltages, where each series load voltage of the plurality of series load voltages is a voltage defined by a corresponding series of N loads of a plurality of series of N loads, where N is an integer greater than one. Also, a minimum voltage may be determined from among the plurality of series load voltages. Next, the maximum voltage from among the plurality of series load voltages may be compared with the minimum voltage from among the plurality of series load voltages to make a determination as to whether the maximum voltage from among the plurality of series load voltages exceeds the minimum from among the plurality of series load voltages by a threshold voltage. Then, an indication can be output based on the results of the determination. | 05-05-2016 |
20160169494 | TREE TOPPER WITH TRUNK ATTACHABLE DEFORMABLE CONDUIT | 06-16-2016 |
20160183338 | MODULAR LIGHT-STRING SYSTEM HAVING INDEPENDENTLY ADDRESSABLE LIGHTING ELEMENTS | 06-23-2016 |
20160190927 | ILLUMINATION DEVICE CONTROL SYSTEMS AND METHODS - In various embodiments, a control system for an electronic circuit iteratively applies voltage to and senses current from a load to regulate operation of the load. | 06-30-2016 |
20160190939 | Push-Pull LED Driver Circuit - Push-pull circuits are described that are suitable for the driving of LEDs and that reduce the voltage stress on the switching transistors that is caused by the output transformer. The push-pull arrangement caters to reducing the size of the transformer as it eliminates the DC magnetic bias of the transformer core and it also caters to the integration of the semiconductor content of the circuit requiring only low side DMOS to be implemented in the monolithic, junction isolated process. | 06-30-2016 |
20160192448 | ILLUMINATION DEVICE CONTROL SYSTEMS AND METHODS - In various embodiments, a control system for an electronic circuit iteratively applies voltage to and senses current from a load to regulate operation of the load. | 06-30-2016 |
20160198533 | SERIAL LIGHTING INTERFACE WITH EMBEDDED FEEDBACK | 07-07-2016 |
20160205730 | CURRENT ROUTING TO MULTIPLE LED CIRCUITS | 07-14-2016 |
20160255684 | Drive Circuit and Illumination Device Comprising the Drive Circuit | 09-01-2016 |
20160255693 | ANALOG AND DIGITAL DIMMING CONTROL FOR LED DRIVER | 09-01-2016 |
20160381752 | LED CURRENT BALANCING CIRCUIT AND METHOD THEREFOR - In one embodiment, and LED control circuit may be configured to monitor the value of currents in two or more strings of series connected LEDs, and to adjust the currents to be substantially equal to each other. | 12-29-2016 |
20170236982 | LED MODULE | 08-17-2017 |
20190150239 | LED LIGHTING SYSTEM | 05-16-2019 |
20080218092 | Christmas light string with socket for connecting to another christmas light string - A Christmas light string is disclosed and includes a plug a power socket, a first cord electrically interconnecting the plug and the power socket, a second cord extending from the plug and being electrically connected thereto, an adapter proximate the plug and mounted in the second cord, and a plurality of lamps electrically connected in series or parallel and mounted along the second cord and distal the plug. The plug of another Christmas light string is adapted to electrically connect to the power socket by insertion. Hence, a number of Christmas light strings can be assembled together to form a lighting unit having an increased length. | 09-11-2008 |
20090085487 | LIGHT SETS - A light set including multiple circuits or light strings and utilizing a single set of electrical connectors. The electrical connectors include a male electrical connector for connection to an electrical power source, such as a wall outlet, and a female connector for receiving a male electrical connector of another light set. The multiple light strings allow a unique light size and electrical rating to be coupled to each light string. Moreover, the multiple light strings may be assembled to produce an array of aesthetically pleasing light arrangements utilizing the different sized lights. | 04-02-2009 |
20090091266 | STRINGED LIGHTS - A stringed light set having a pair of conductors for supplying electricity and at least one light electrically connected to the conductors for receiving electricity and providing luminance. The at least one light being adapted to move between a use position and a storage position relative to the conductors. | 04-09-2009 |
20090128046 | Rectifier module for LED lamp strings - A rectifier module is provided for simultaneous use with a plurality of light-emitting diode (LED) lamp strings. The rectifier module includes an extension cable having first and second ends to which first and second connectors are mounted and a casing mounted to the extension cable and including therein an electronic circuit. The electronic circuit includes a rectifier element, which can be a diode based circuit or a bridge rectifier, to which a resistor and a capacitor are electrically connected. The resistor can be a variable resistor to allow for manual adjustment. The casing can be mounted to a middle portion of the extension cable or, if desired, can be integrated with either one of the connectors. | 05-21-2009 |
20090189533 | Dual colored LED decoration lamp - A dual colored LED decoration lamp which includes a lamp string combined of multiple dual colored LED lamps and a controller connected between the power supply and the lamp string. The lamp string includes lamp groups combined of multiple LED lamps with two different colors and with their anodes and cathodes cross-linked. The multiple lamp groups are then connected in series, and each LED lamp in every lamp group is connected in same direction with the same colored LED lamp in the next lamp group. The controller controls the variation of the direction of current in aforementioned lamp strings. Thus, the lamp string is able to emit light with different colors by varying the current direction in the same lamp string through the usage of controller, and there is no need to set with multiple lamp strings. | 07-30-2009 |
20090256485 | Decorative light string - A decorative light string has a power connector, at least one lightening unit and a rectifier. The lightening unit is electrically connected to the power connector and has an incandescent bulb set and an LED set. The incandescent bulb set has a primary wire and multiple incandescent bulbs. The LED set has a secondary wire and multiple LEDs. The incandescent bulbs and LEDs are respectively electrically connected to the primary and the secondary wire. The secondary wire is electrically connected and intertwined with primary wire. At least one of the incandescent bulbs of the incandescent bulb set is placed between each two of the LEDs. The rectifier is electrically connected the power connector and each LED set in series. The decorative light string has an advantage of preventing snow to veil LEDs by the heat from the incandescent bulbs when used in the snows. | 10-15-2009 |
20090273289 | LED Light String for Decoration with Units having Replaceable LED and Housing - A lamp unit includes a power cord having a mating plug at one end and a corresponding mating plug at the other end, a bulb seat, an LED holder, an LED, and a housing. The LED is mounted on the LED holder in a watertight fashion and the LED holder is mounted on the bulb seat in a watertight fashion so as to prevent water from getting in the bulb seat. The LED can be replaced with another LED capable of emitting light of different color. The housing can be replaced with another housing of different shape. The corresponding mating plug of one lamp unit is adapted to connect to the mating plug of another lamp unit so as to form an LED light string for decoration of any desired length. The invention is highly adaptable to be employed in different environments and events. | 11-05-2009 |
20090278463 | POWER INTERRUPTION PROTECTION STRUCTURE FOR LED STRING LIGHT - A power interruption protection structure for an LED string light implements a Zener diode connected between an anode and a cathode inside or outside a casing of each of plural monochromatic or polychromatic LEDs that are connected in series to form the LED string light. In case of a burnout or breakdown of one of the LEDs, the Zener diode provided at the malfunctioning LED serves to instantly restore electrical conduction, allowing the LED string light to function normally without interruption. Accordingly, failure of one or some of the LEDs does not affect the LED string light as a whole. | 11-12-2009 |
20090278464 | Christmas light string combining tungsten lamps with LED lamps - The present invention is to provide a kind of decoration light string structure combining of tungsten filament lamps and LED lamps, which is characterized in a decoration lamp string with single power plug and combining of wrapped tungsten filament lamp string and LED lamp string to form a curtain lamp configuration. The decoration light string is thus equipped with two kinds of light source effects of the traditional tungsten filament lamp and LED lamp. | 11-12-2009 |
20090284159 | Decorative light string device - The present invention discloses a decorative light string device, which comprises: a power plug receiving AC power, a tail socket coupled to the power plug, and a LED string with one end thereof coupled to the power plug and the other end thereof coupled to the tail socket, wherein each of the power plug and tail socket has a diode and a capacitor coupled to the diode, whereby a DC voltage, which is twice the peak voltage of the AC power, is output to the LED string. | 11-19-2009 |
20090289560 | Pop-up christmas tree - A pop-up Christmas tree that is formed by translucent spandex printed fabric member, printed with a graphic of a real Christmas tree, wrapped into a cone shape. An electrically motorized power antenna assembly is located within the hollow trunk of the tree display. A plurality of supporting frames and cords are mounted inside the fabric cone shape. The antenna tip is attached to the internal apex of the fabric cone shape. The base of the cone shape is attached to the perimeter of a molded plastic tree base housing. When the user activates the power antenna via a remote control switch, the tree shape rises from its base housing to instantly form a realistic Christmas tree shape. The walls of the fabric cone shape include apertures that hold standard Christmas lights and hooks for ornaments. | 11-26-2009 |
20090289561 | FLICKER-FREE LED LAMP AND LED STRING LAMP - A light emitting diode (LED) lamp comprising an LED light ( | 11-26-2009 |
20090309504 | COLOR-CONTROLLABLE LIGHT STRING - A color-controllable light string has a control box and a light string composed of lighting units. The control box provides a DC power to the lighting units through two power wires and transmits a synchronization signal to the lighting units through a signal wire. Each of the lighting units has a waterproof assembly constructing a sealed environment and an LED circuit board with multiple LEDs of different colors mounted in the sealed environment to provide colorful lights by mixing and activating proper LEDs. | 12-17-2009 |
20090322236 | Christmas light string with LED bulb loop and incandescent light bulb loop - A Christmas light string includes a plug; a first negative wire together with a first positive wire and the plug forming a circuit; incandescent light bulbs connected together along the first positive and negative wires to form a first loop; a rectifier having a positive input connected to the first incandescent light bulb via a second positive wire and a negative input connected to the last incandescent light bulb via a second negative wire; an end enlargement connected to the positive input of the rectifier via the second positive wire and the negative input of the rectifier via the second negative wire; and LED bulbs forming a second loop between the positive output and the negative output of the rectifier. An optimum illumination is rendered by mixing cold light with warm light. Moreover, mating sockets are adapted to receive the incandescent light bulbs only. | 12-31-2009 |
20100141161 | HOLIDAY LED LIGHTING SYSTEM AND METHODS OF USE - The present disclosure provides a decorative light string system comprising a light string comprising a plurality of lighting bulbs arranged electrically in series, wherein each light bulb comprises at least two LED chips, wherein half of said LED chips are connected in parallel and wherein half of said LED chips are connected in reverse parallel; and a switch box, and a switchbox comprising a switch having at least a first position and a second position, wherein when the switch is in the first position, a first pole is engaged allowing passage of a positive waveform lighting the LEDs connected in parallel, and wherein when the switch is in a second position, a second pole is engaged allowing passage of a negative waveform lighting the LEDs connected in reverse parallel; as well as methods of using said decorative light string system. | 06-10-2010 |
20100148680 | LED LIGHT STRING CAPABLE OF INCREASING THE NUMBER OF LEDS WITHOUT ADDING EXTENSION PLUGS AND SOCKETS - An LED light string has a plug with two front diodes, an extension socket with two rear diodes, multiple LED units connected between the plug and the extension socket, and multiple intermediate diodes connected to the LED units. The intermediate diodes, the two front diodes and the two rear diodes are connected to form multiple bridge rectifiers. The multiple bridge rectifiers are connected to an AC voltage in parallel and drive the LED units, respectively. | 06-17-2010 |
20100176735 | LED light string assembly with constant current circuit - An LED light string assembly has a plug, an extension socket, a light string connected between the plug and the extension socket, and at least one constant current circuit connected to the light string. The constant current circuit has a first input capacitor, a second input capacitor, a first diode, a second diode and a filter capacitor. The first input capacitor is connected in series to the second input capacitor between a first AC terminal and the cathode of the first diode. The second diode is connected between the first diode and the second AC terminal. The filter capacitor is connected between the cathode of the first diode and the second AC terminal. | 07-15-2010 |
20100194297 | Light string device - The present invention discloses a light string device to solve the problem of a limited LED quantity in the conventional technology. The light string device of the present invention comprises a plug containing a full-wave voltage-doubling circuit. The full-wave voltage-doubling circuit converts an AC power into a high-voltage signal powering the light string, whereby the present invention can increase the quantity or brightness of LEDs in the light string without replacing the power supply or increasing the cost. | 08-05-2010 |
20110074300 | STRUCTURE OF AN LED DECORATION LAMP - A dual colored LED decoration lamp which includes a lamp string combined of multiple dual colored LED lights and a controller connected between the power supply and the lamp string. The lamp string includes lamp groups combined of multiple LED lights with two different colors and with their anodes and cathodes cross-linked. The multiple lamp groups are then connected in series, and each LED light in every lamp group is connected in same direction with the same colored LED light in the next lamp group. The controller controls the variation of the direction of current in aforementioned lamp strings. Thus, the lamp string is able to emit light with different colors by varying the current direction in the same lamp string through the usage of controller, and there is no need to set with multiple lamp strings. | 03-31-2011 |
20140091719 | CHRISTMAS STRING LIGHT CONTROL SYSTEM AND STRING LIGHT DEVICE THEREOF - A string light device employs a mobile device to control a string light thereof through a bluetooth connection module thereof. The mobile device is activated to switch to one of the display modes of the string light so as to operate the string light to exhibit a visual effect, such as blinking the string light according to rhythms of music or sounds or changing the luminance or color or the string light. Accordingly, users achieve to wirelessly control a string light by simply using a mobile device, such as a smart phone or a tablet personal computer. | 04-03-2014 |
20160007430 | REMOTELY CONTROLLED HOLIDAY LIGHTING AND SOUND SYSTEM - A remotely controlled holiday lighting and sound system provides a remotely controlled and decorated control module that integrates into a holiday symbol, such as a Christmas tree, to control a holiday themed lighting pattern and audio recording for a plurality of light strings and a speaker. The system provides a plurality of light strings having spaced apart lights connected together in series around the holiday symbol. The system further includes a speaker that integrates into the holiday symbol and emits a holiday themed audio recording that is consistent with the theme of the holiday symbol. A control module is associated with the light strings and the speaker for selective control of each. The control module is covered with a holiday themed ornamental member. A receiver in the control module uses Wi-Fi or Bluetooth protocol to receive command signals from a transmitter in a mobile communication device. | 01-07-2016 |