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8174207 |
Lamp and driving device for backlight assembly having the same
A device for driving a backlight assembly includes a controller for outputting a control signal, a switching unit for outputting a DC square wave voltage in response to the control signal, an...
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8129916 |
Light emitting driver circuit with bypass and method
A light emitting driver circuit, system, and method are provided. The driver circuit system and method can be implemented in various ways. An embodiment includes a bypass circuit which diverts...
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8129914 |
Operating circuit for light-emitting diodes
An operating circuit for at least one light-emitting diode (LED) incorporates a switched-mode regulator circuit to which a DC voltage is fed and which provides a supply voltage for the at least one...
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8120266 |
Driving circuit for driving a load
A driving circuit comprises a first and a second switching circuit coupled in parallel to a node which is adapted to be coupled to a load, a first and a second detecting circuit, and a...
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8120273 |
Light control system with PWM duty cycle control using current signal feedback
A light control system having a light emitting device to produce a pre-determined light output is disclosed. The light control system includes a power circuit in electrical communication with the...
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8110998 |
Multi-pulse ignition circuit for a gas discharge lamp
An ignition circuit for igniting a gas discharge lamp generates a high voltage gas breakdown pulse by building up a current through a primary winding of a transformer. After a predetermined period...
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8106601 |
LED illuminant driving circuit and automatic brightness compensation method thereof
An LED illuminant driving circuit and an automatic brightness compensation method thereof are provided herein. The automatic brightness compensation method includes: providing a target value;...
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8106600 |
Photopolymerization apparatus
A light-weight, portable photocuring device possesses a single multi-wavelength light emitting diode (LED). The single LED backed with a heat sink is driven by a driving circuit and controlled by a...
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8089220 |
Circuit arrangement and method for operating a high-pressure discharge lamp
A circuit arrangement for operating a high pressure discharge lamp includes a bridge circuit with at least two switches, a control device controlling the switches. The bridge circuit is a...
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8084954 |
Lamp driving circuit
The present invention relates to a lamp driving circuit capable of achieving miniaturization by using a safe insulation type multi-output transformer. The lamp driving circuit in accordance with...
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8084953 |
Changing power input to a gas discharge lamp
The present disclosure thus provides a technique for providing multi-level operation of ballast circuitry for discharge lamps. In one version, an auxiliary capacitance is switched in and out of...
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8084962 |
Driving circuit for LED
A driving circuit for LED includes: at least one LED; a light emission driving circuit having a first PWM unit and a power converting unit generating a driving current according to a signal...
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8076865 |
Ignition for ceramic metal halide high frequency ballasts
A high frequency ballast for a metal halide lamp comprises a controller, a switch, and an oscillator. The controller selectively enables and disables the oscillator via the switch to ignite the...
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8076864 |
Circuit configuration for starting and operating at least one discharge lamp
A circuit arrangement for starting and operating at least one discharge lamp is provided.
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8058812 |
Buck-mode boost converter with regulated output current
An LED driver circuit that includes a buck-mode boost converter that provides a regulated output current and that requires only a single connection to each channel of LEDs. The buck-mode boost...
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8054003 |
Switch-off time regulation system for an inverter for driving a lamp
The present invention relates to an electronic ballast for operating a lamp (L) which has a Class E converter (T1, L1). When a lamp (L) is connected, the output current of the Class E converter...
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8053999 |
HID ballast
A method and apparatus are disclosed for providing current to a load. The apparatus includes a full or half bridge switching circuit, including at least one switching element for supplying power to...
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8044919 |
Backlight driving apparatus of LCD and driving method thereof
An inverter of a liquid crystal display for receiving a power voltage for burst dimming via one power terminal to simultaneously adjust a burst dimming and an analog dimming is disclosed. In the...
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8035311 |
Light-emitting semiconductor device driver and method
An electronic device includes circuitry for driving a light-emitting diode (LED) or other light-emitting semiconductor device. The circuitry includes a first switch (NM5) coupled with the...
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8026673 |
Methods and apparatus for simulating resistive loads
Methods and apparatus for simulating resistive loads, and facilitating series, parallel, and/or series-parallel connections of multiple loads to draw operating power. Current-to-voltage...
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8022639 |
Dimming fluorescent ballast system with shutdown control circuit
A ballast system for, and a method of, controlling illumination of a lamp, include a dimmer switch having an actuator settable at different settings corresponding to different output voltages...
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8018174 |
Safety circuit for electro-luminescent lamp ballast
A safety circuit is provided for a ballast of an electro-luminescent (EL) lamp. The EL lamp had an electrical ground shield on at least a portion thereof and has a separate ground lead. The ballast...
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8018177 |
Dimming buck type LED driving apparatus
A dimming buck type light emitting diode (LED) driving apparatus includes a main switch controlling a driving current flowing into an LED; a current detector detecting a driving current flowing...
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8008873 |
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...
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8008866 |
Hybrid light source
A hybrid light source comprises a high-efficiency lamp, for example, a fluorescent lamp, and a low-efficiency lamp, for example, a halogen lamp. A control circuit individually controls the amount...
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8004213 |
Power supply, light emission control device and display device
The power supply of the present invention is composed of: a charge pump circuit (54) that periodically turns on and off a plurality of charge-transfer switches (Q1 to Q4) according to clock signals...
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7999489 |
Circuit for driving light sources using balanced feedback signal
An exemplary circuit (200) for driving light sources (211, 212, 213, 214) includes feedback circuits (218, 228, 238, 248), a signal balance circuit, and a controller (250). Each feedback circuit...
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7994731 |
Universal input voltage device
A universal input voltage device is presented which may receive a wide range of regulated and unregulated input voltages, both DC and a wide range of variable frequency AC, and output a desired...
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7990069 |
Method and circuit for driving a gas discharge lamp
A method for driving a gas discharge lamp and relates to a lamp driver circuit for driving a gas discharge lamp. The method includes supplying a current to the gas discharge lamp, reversing the...
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7986103 |
Method for driving a lamp in a lighting system based on a goal energizing level of the lamp and a control apparatus therefor
A method and a control apparatus for driving a lamp 14 in a lighting system, in particular a lamp having a fast response to a change of an amount of energy supplied through the lamp, in which a...
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7982406 |
Active lamp current crest factor control
Ballasts with crest factor control are provided. During a transition to a given half cycle steady state, the current provided to reach the steady state is varied, such as turned off for a short...
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7982412 |
LED circuit with high dimming frequency
A LED circuit comprises: an inductor, a group of LEDs, a capacitor, a power MOS and a switching circuit. The inductor is connected to a voltage supply and a first node; the group of LEDs is...
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RE42425 |
Dimmer having a power supply monitoring circuit
A two-wire dimmer for control of a lighting load from an alternating-current (AC) power source includes a semiconductor switch, a power supply, and a control circuit. The power supply includes an...
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7911147 |
Limited current circuit of digital inverter for LCD backlight
A limited current circuit of this invention comprising: a transformer that raises an alternating current (AC) power supplied from the digital inverter to an AC voltage of a high voltage to light a...
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7911148 |
Circuit arrangement for operating a discharge lamp having temperature compensation
The invention relates to a circuit arrangement which is used to operate a low pressure discharge lamp (EL), wherein the discharge lamp receives power. Said circuit arrangement is embodied in such a...
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7902764 |
Control device for discharge lamp
A driving method for a discharge lamp having two cathodes includes providing a supply input voltage for providing an alternating voltage at the terminals of the cathodes, monitoring a condition of...
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7898298 |
Inverter driver integrated circuit
An inverter driver integrated circuit (IC) includes a control signal generator generating a first control signal and a second control signal by use of a pulse width modulation oscillator signal, a...
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7839098 |
Microcontroller based ignition in high frequency ceramic metal halide lamps
A high frequency ballast for a metal halide lamp comprises a controller, a switch, and an oscillator. The controller selectively enables and disables the oscillator via the switch to ignite the...
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7819531 |
Projector
A light source device includes first and second electrodes, an arc tube having a main body section having a discharge space in which the first and second electrodes are disposed with a distance and...
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7791283 |
Discharge lamp lighting apparatus
There is provided highly efficient discharge lamp lighting apparatus capable of reducing its cost by reducing high withstand voltage components on the secondary side of a high voltage transformer...
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7768212 |
LED driver and circuit for controlling a power switch to provide a driving voltage to at least one LED
An LED driver circuit and its control circuit for controlling its power switch are provided. The LED driver includes a switch, a PWM controller, a current source and a signal controller. The switch...
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7755297 |
Display apparatus and control method thereof
A display apparatus and a control method thereof are provided. The inventive method and apparatus improves a response speed of a light source and image quality by minimizing a ripple of a current...
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7755298 |
Power supply circuit with soft start circuit
An exemplary power supply circuit (20) includes a scaler (21), a field-effect transistor (23), a pulse width modulation circuit (25), and a capacitor (29). The scaler includes an output port (213)....
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7741787 |
Light-emitting diode driving circuit
A light-emitting diode driving circuit includes a control circuit, a transistor switch and a compensating circuit. The control circuit receives an oscillating signal to generate a pulse drive...
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7733032 |
OLED driver and lighting apparatus equipped with the same
An OLED driver for driving at least one organic electroluminescence element and lighting apparatus equipped with the driver. The driver has a direct-current power source and a dimmer. The source...
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7728527 |
Energy saving power supply circuit
A power supply circuit includes a power supply input for receiving power from a power supply, a power supply output for supplying power to a load, a voltage reference circuit, and a switch circuit....
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7723928 |
Ballast control IC with minimal internal and external components
A ballast controller integrated circuit which executes a specific set of instructions via an integrated state diagram architecture to control a fluorescent lamp or high intensity discharge lamp and...
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7719205 |
Inverter for driving light source
An inverter for driving light source is disclosed. The inverter includes a pulse control unit for producing a conduction period signal, a power switch unit driven by the conduction period signal...
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7705543 |
Supply device of circuit branches with LED diodes
A device includes at least two circuit branches, each of said at least two circuit branches comprising at least one LED diode. The device comprises a supply circuit that provides an electric supply...
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7679295 |
Converter with feedback voltage referenced to output voltage with separate ground planes for converter and load
A driver for a white LED string or a display is provided. The driver includes a boost converter that is arranged to provide an output voltage from a source voltage. Also, the driver includes a...
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