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7633245 |
Light-emitting device driver circuit
A driver circuit is designed employing a current sensing circuit adapted to sense driving current being supplied to one or more light emitting devices. The driver circuit additionally employs a...
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7633239 |
Dimming circuit for controlling electrical power
A dimming circuit includes an isolated DC voltage source that is selectively coupled to a switch through which power is supplied from a source to a load. In a disclosed example, the switch...
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7633238 |
Lamp driving device and display apparatus having the same
A lamp driving device includes first, second, and third voltage converters. The first voltage converter converts a direct current (DC) power voltage to a first pulse voltage. The second voltage...
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7633779 |
Method and apparatus for operating a light emitting diode with a dimmer
A circuit includes an input and an output, and an electronic light generator drive portion that is coupled to the input and drives the output. In one configuration, the circuit includes a further...
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7629752 |
Light source driving device
A light source driving device is for driving a plurality of light sources of a light source module ( 12 ), and comprises an inverter circuit ( 11 ), a current sampling circuit ( 13 ) and a PWM...
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7626342 |
High efficiency power controller for solid state lighting
A high efficiency power controller comprising of a driver circuit to convert to direct current (DC) voltage from alternating current (AC) voltage is used for drive solid state lighting (SSL)...
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7626341 |
Discharge lamp lighting apparatus
A discharge lamp lighting apparatus includes an input power supply, a power supply circuit, a bridge circuit having switching elements that performs AC operation of a discharge lamp, a lighting...
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7626346 |
LED circuit with current control
Circuit for regulating a current applied to an electrical load, comprising
a compensation unit comprising a temperature sensor and providing an electrical signal at an output, the electrical...
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7619904 |
Pulse signal drive circuit
A pulse signal drive circuit includes an energy storage device. A source of energy supplies a substantially constant flow of energy to the energy storage device. A switch circuit draws repetitive...
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7615940 |
Gate driver topology for maximum load efficiency
A circuit comprises a first input for receiving a supply voltage and a second input for receiving a sensed current signal from an output of a DC to DC converter. The circuit also includes an output...
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7615941 |
Apparatus and method for maximizing the longevity of arc tube bulbs during pulsing operation
Heating or powering a filament less light bulb, and preferably a High Intensity Discharge light sufficiently close to steady state temperature and then pulsing the current, thereby improving and or...
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7612505 |
Liquid crystal display backlight inverter
A LCD backlight inverter including: a dimming control unit comparing a level of a triangle wave with a level of a dimming control signal and controlling a dimming control current to be supplied or...
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7613020 |
Discharge lamp ballast apparatus comprising DC/DC converters having at least two transformers and outputting two kinds of voltages
A discharge lamp ballast apparatus includes a DC/DC converter having a transformer T 1 and a DC/DC converter having a transformer T 2 , which are connected in parallel; a control section 4 for...
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7605545 |
Control system for multiple fluorescent lamps
The present invention is directed to an apparatus that drives a lighting system with multiple lamps. A phase shift mechanism is produced either by a digital method, an analog method, or a mixture...
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7605809 |
Driver and method for driving a semiconductor light emitting device array
A driver and method for driving a semiconductor light emitting device array is provided. The driver includes at least one current regulator unit having a plurality of controllable switches to...
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7592757 |
System and method for dimming one or more light source
A system for dimming one or more light sources includes a first light source that emits a light of a first brightness according to an operating condition of the first light source, a second light...
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7593241 |
Hybrid power supply system
A hybrid power supply system including piezoelectric and ferrite transformers for driving a discharge lamp is provided. Specifically, the hybrid power supply system includes a rectifier/filter, a...
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7589477 |
Control method and ballast for run-up of metal halide lamp
A method of controlling run-up of a metal halide lamp that has a nominal (full) light output during steady state operation and that has a current limit I lim , includes a lamp ballast sensing lamp...
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7583035 |
System and method for driving LED
A system drives one or plurality of LEDs regulating their brightness by controlling LEDs average current or voltage. The system includes a switching power converter and an integrated digital...
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7573207 |
Driver system and method with multi-function protection for cold-cathode fluorescent lamp and external-electrode fluorescent lamp
System and method for driving a cold-cathode fluorescent lamp. The system includes a control subsystem configured to generate one or more control signals, and a power supply subsystem configured to...
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7570235 |
Communication diode driver circuit
A Communication Diode Driver Circuit (CDDC) for selectively illuminating communication diodes (CDs) in response to incoming digital data pulses with a LED drive current I LED (t) close to a nominal...
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7569998 |
Striking and open lamp regulation for CCFL controller
An apparatus and method for igniting a lamp during a strike mode of an inverter comprising: sequentially controlling a duty cycle sweep and a frequency sweep of driving signals in the inverter to...
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7567041 |
Discharge lamp lighting apparatus and projector
In a lamp lighting apparatus for lighting a high intensity discharge lamp, which is used for a projector, it is possible to carry out high speed modulation of brightness of the discharge lamp, in...
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7564192 |
HID dimming method and apparatus
A HID dimming method and apparatus are provided. The method includes generating a dc waveform during a reduced power dimming mode of operation of the HID lamp, the reduced power dimming mode being...
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7560879 |
Method and apparatus for DC to AC power conversion for driving discharge lamps
Methods and circuits are disclosed for converting DC power to AC power for driving discharge lamps such as cold cathode fluorescent lamps (CCFLs). Among other advantages, the lamp current and open...
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7557515 |
Simplified ballast control circuit
A ballast control circuit for use with a fluorescent lamp in accordance with an embodiment of the present application includes a voltage controlled oscillator operable to provide an operating...
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7554271 |
Single stage PFC and power converter circuit
A power converter provides constant load power while achieving a high power factor in a single stage configuration with reduced component count and ratings. The power converter takes a rectified...
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7554272 |
Low noise electroluminescent lamp (EL) driver and method therefor
An EL driver circuit has a full H-bridge circuit. A boost converter is coupled to the full H-bridge circuit. The boost converter is pulse width modulated to generate a gradual increase in voltage...
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7550934 |
LED driver with fast open circuit protection, short circuit compensation, and rapid brightness control response
An LED driver drives one or more strings of series-connected LEDs. A feedback voltage at a sense resistor is detected by an op amp, and the op amp controls the conductivity of a MOSFET in series...
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7550933 |
Offline control circuit of LED driver to control the maximum voltage and the maximum current of LEDs
An offline control circuit of LED driver controls the maximum voltage and the maximum current of a plurality of LEDs. A switching circuit generates a plurality of LED currents through a...
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7545102 |
Single-stage electronic ballast device
A single-stage electronic ballast device outputs a square wave current to drive an HID lamp, which includes a rectifying and power factor correction unit, a bridge converter and a controller...
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7541746 |
Lamp driver circuit with power factor correction circuit coupled to direct-current to direct-current power converter
A lamp driver circuit is disclosed. The lamp driver circuit comprises a passive power factor correction (PFC) circuit. The passive PFC circuit, in operation, is coupled with an alternating-current...
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7538498 |
Driving circuit of surface light source and method of driving the same
A driving circuit of a surface light source and a method of driving the same are disclosed, which is suitable for decreasing the luminance-stabilization period of time and improving the...
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7535183 |
Apparatus and method to provide a hybrid linear/switching current source, such as for high-efficiency, wide dimming range light emitting diode (LED) backlighting
A hybrid power supply provides powers to a load, such as a light emitting diode (LED) backlight display, using pulse wave modulation (PWM) enable signal to control activation of a linear power...
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7531969 |
Arc lamp improvements
An arc lamp power supply with a first part including a converter adapted to convert a low voltage power supply to provide an arc running power supply suitable for running an arc lamp after an arc...
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7528551 |
LED control system
In one embodiment, an LED system is controlled to have a substantially unity power factor.
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7528557 |
Electronic controller for high-power gas discharging lamp
An electronic controller for a high-power gas discharging lamp bulb includes a filter circuit to reduce interference and control the electromagnetic characteristics of an input power signal. A...
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7524085 |
Series wiring of highly reliable light sources
The light array of this invention includes a number of columns and rows of LED's connected in a series/parallel combination. The series parallel combinations effectively optimize the impedance,...
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7521877 |
Dimmer circuit for a discharge lighting apparatus
There is provided a discharge lamp lighting apparatus including a dimmer circuit which is provided with a control means to dynamically adjust screen brightness according to an input signal, and a...
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7521876 |
Electronic ballast with lamp type determination
An electronic ballast includes open circuit voltage regulation comprises an filament current sensing circuit 224 operably connected to an output of the electronic ballast and generating a sensed...
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7521912 |
Power supply apparatus
In a power supply apparatus for performing constant current driving of a light emitting diode which is a load circuit, a constant current circuit is disposed on a path for driving the load circuit....
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7521879 |
Device for driving light emitting diode
A device for driving a plurality of light emitting diodes includes a plurality of light emitting diode groups in series; a current providing unit for providing a current to the plurality of light...
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7521874 |
Dimmable ballast control integrated circuit
An IC for controlling a power supply circuit for delivering power to a fluorescent lamp in accordance with an embodiment of the present invention includes a ballast control section operable to...
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7518319 |
LED lighting device and LCD device using the same
An LED lighting device can compensate a brightness change and a color change caused by a temperature change and exhibit an in-plane uniform luminance and color. A lighting device includes: at least...
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7514880 |
Lighting apparatus for projector
A lighting apparatus for a projector comprises a control module, a lamp driver and a transient voltage suppression circuit, in which the control module is used for generating a lighting signal, the...
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7514879 |
Method and system for driving a plasma-based light source
A gas discharge lamp is driven with a constant current square wave from a current transformer where the number of volt-microseconds are designed such that at the start of each square wave, the...
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7511435 |
Backlight unit and liquid crystal display device having the same
A backlight unit includes: a power supplying part; a non-dimming point light source receiving power from the power supplying part and providing a feed back signal to the power supplying part; a...
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7511436 |
Current control method and circuit for light emitting diodes
A flow of a LED current (ILED 2 ) through one or more LEDs is controlled by a LED current control circuit ( 50 - 54 ) implementing a method ( 30 ) that is independent of an input line and a load of...
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7511437 |
Methods and apparatus for high power factor controlled power delivery using a single switching stage per load
Methods and apparatus for high power factor power transfer to a load using a single switching stage. In exemplary implementations, a controllable variable power may be delivered to a load using a...
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7504782 |
Discharge lamp lighting apparatus and projector
A discharge lamp lighting apparatus comprising a d.c. power source section which rectifies and smoothes an a.c. voltage; a current detecting circuit which detects a current which flows through a...
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