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7109665 |
Three-way dimming CFL ballast
A three-way dimming CFL ballast operates at a single high bus voltage while varying switching frequency to control lamp current. The ballast accepts three different light level input switch command...
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7109667 |
Discharge lamp driving apparatus
A discharge lamp driving apparatus comprises a DC power supply, a control circuit, switching elements, a step-up transformer, and a lamp current controlling circuit. In the discharge lamp driving...
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7098605 |
Full digital dimming ballast for a fluorescent lamp
A lamp control circuit is described, containing a power factor corrector, coupled to it a digitally controlled ballast, having power devices. The digitally controlled ballast is capable of powering...
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7098606 |
Electronic ballast with open circuit voltage control and cable compensation
An electronic ballast uses a voltage sampling circuit and a voltage control circuit to limit the open circuit voltage of the ballast. A lamp voltage sensing circuit is provided that uses a voltage...
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7098607 |
Electronic ballast with lossless snubber capacitor circuit
An improved high input voltage instant start electronic ballast uses a substantially lossless snubber circuit. The substantially lossless snubber circuit is incorporated into the ballast to reduce...
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7098727 |
Boosting circuit
A boosting circuit is provided that includes a reference voltage generating circuit unit to generate a reference voltage, a voltage boosting circuit to output a given boosting voltage, and a...
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7098608 |
Lossless circuit for sampling of lamp voltage
An electronic ballast has a resonant tank circuit that includes a tank inductor and a tank capacitor connected in series. Lossless sampling of the output voltage of the electronic ballast is...
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7098612 |
Frequency synchronization device for LCD lamps
A frequency synchronization device for a large LCD having a plurality of lamps as a background light source is disclosed. The device comprises a power amplification unit wherein one power...
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7093962 |
Light emitting device and method of using same
An apparatus and method for strategically illuminating a darkened area. The present invention may be used by law enforcement to illuminate an area without law enforcement officials having to reveal...
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7095637 |
Method of determining working voltage of inverter
The present invention pertains to a method of determining a working voltage of an inverter, which utilizes a rectifying method to transform an alternating current into a pulse direct current, and...
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7095184 |
Electronic ballast for a lamp to be operated using iterative voltage pulses
A ballast and its operating method for a dielectrically impeded discharge lamp. The ballast contains a transformer having a third winding which can be short-circuited via a switch. By so doing, the...
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7095183 |
Control system for a resonant inverter with a self-oscillating driver
A controller for a resonant inverter with a self-oscillating driver IC for powering AC loads, such as gas discharge lamps or regulated DC/DC converters, includes a timing circuit that generates...
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7088058 |
Image display
An image display device which has a display element that optically modulates an incident light for displaying an image. A lamp is a light source of the incident light to the display element. A lamp...
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7088055 |
High efficiency controller of a gas-filled light emitting tube
The present invention relates to a high-efficiency controller of a gas-filled light producing tube; the controller can produce signals in a form of outputs of high-frequency sine wave to soft-start...
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7084832 |
Plasma production device and method and RF driver circuit with adjustable duty cycle
An RF driver circuit and an orthogonal antenna assembly/configuration, are disclosed as part of a method and system for generating high density plasma. The antenna assembly is an orthogonal antenna...
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7084581 |
Device and method for controlling a gas discharge lamp, and lighting system with gas discharge lamp and control device
A device and a method for the control of a gas discharge lamp are disclosed. In order to detract as little as possible from lamp life in spite of the luminous flux requirements to be fulfilled...
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7081708 |
Lighting circuit
A lighting circuit for lighting a vehicular lamp including a plurality of light-emitting diodes, includes: a selection unit for selecting the number of light-emitting diodes to be connected in...
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7081743 |
Intelligent power supply and control method thereof
Intelligent power supply and control method thereof. A power supply for altering an output power by detecting a power requirement of an electronic device and the electronic device having a memory....
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7078868 |
DC—DC converter and device for operation of a high pressure discharge lamp using said converter
A low cost DC—DC converter which facilitates a reduction of the switching loss in a wide, variable range of the continuity ratio of the main switching device includes a direct current source; an...
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7078870 |
Simplified topology for HID lamps
An HID ballast includes a flyback power converter with a simplified topology that permits power factor correction while supplying constant output power to drive an inverter supplying low frequency...
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7078867 |
DC—DC converter and device for operation of a high pressure discharge lamp using said converter
A DC-DC converter which accomplishes a reduction of the switching loss in the wide, variable range of the continuity ratio of the main switching device includes a direct current source, an...
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7077530 |
Projector of external power supply
The invention is to provide a projector of external power supply, which comprises: a DC (direct current) power supply port, a step-up circuit, a voltage regulation circuit, a lamp, and an igniter....
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7075245 |
Driving circuit for multiple cold cathode fluorescent lamps backlight applications
The present invention provides a driving circuit for driving a light source. The driving circuit includes a serial-arranged transformers system having multiple primary windings and secondary...
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7075249 |
Arrangement in connection with a coupling device of a fluorescent lamp
An arrangement in connection with a coupling device of a fluorescent lamp, the coupling device comprising a supply transformer, whose secondary is coupled in parallel with a fluorescent tube, the...
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7075251 |
Universal platform for phase dimming discharge lighting ballast and lamp
A ballast, or power supply circuit, for gas discharge lamps of the type using IC control based gate-drive circuitry for controlling a pair of serially connected switches of a d.c.-a.c. inverter....
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7075246 |
Discharge lamp illumination circuit
A discharge lamp illumination circuit 1 has a DC-AC conversion circuit 3 which effects AC conversion and boosting upon receipt of a DC input, and a starter circuit 4 for supplying a start-up...
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7075254 |
Lighting ballast having boost converter with on/off control and method of ballast operation
A ballast for driving a gas discharge lamp comprising a rectifier stage having an alternating current (AC) input and providing a rectified output voltage, a boost converter stage receiving the...
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7071762 |
Supply assembly for a led lighting module
A supply assembly for an LED lighting module includes a control switch for supplying a constant current to the LED lighting module. A dual switching signal composed of low frequency bursts of high...
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7071630 |
Closed loop magnetic boost LED driver system and method
Current is delivered to a load using a closed-loop boost circuit topology that is suitable for LED driver applications. An inductor is charged when a transistor is active during a first operating...
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7067991 |
Feedback sampling control circuit for lamp driving system
The invention discloses a feedback sampling control circuit for a lamp driving system having a feedback loop, in that the feedback sampling control circuit includes a switch and an effective...
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7067987 |
Electronic ballast with closed loop control using composite current and voltage feedback and method thereof
An electronic control system especially for non-linear loads, such as high pressure sodium (HPS) lamps, includes an active power factor correction circuit (APFC). The system provides a power factor...
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7067989 |
Modularized inverter control circuit
A modularized inverter control circuit makes use of a push-pull type control IC to connect other accessory circuit units, and is packaged and disposed on a printed circuit board to accomplish...
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7067988 |
Inverter circuit for lighting discharge lamps with reduced power consumption
An inverter circuit for lighting discharge lamps with reduced power consumption is disclosed. The inverter circuit comprises: a transformer having a resonant circuit formed by a parasitic...
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7067990 |
Projection type video display
A projection type video display reduces the flicker in projection images caused by the brightness fluctuation of a light source lamp regardless of the kind of lamp used as a light source lamp. The...
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7064496 |
State detection device
A state detection device is disclosed that is for detecting driving states of plural loads which are connected with each other in parallel and are driven by a driving unit. The state detection...
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7064494 |
Discharge lamp operating apparatus and self-ballasted electrodeless discharge lamp
A discharge lamp operating apparatus includes a DC power circuit portion for outputting a DC voltage; an inverter circuit including a switching element provided with a control terminal for...
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7064495 |
Electronic circuit and method of supplying energy to a high-pressure gas-discharge lamp
The invention relates to an electronic circuit and a method of supplying energy to a high-pressure gas-discharge lamp H, 65, 75 . The electronic circuit comprises a line-supply input section 62,...
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7061781 |
Circuit arrangement for operating light sources
In a circuit arrangement for operating light sources, inexpensive technologies for power factor correction can be used in combination. A resonant capacitor in a reactance network for coupling the...
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7061187 |
Circuit having clamped global feedback for linear load current
A resonant circuit includes a clamped feedback signal for providing a load current signal envelope that substantially tracks an input signal. With this arrangement, circuit efficiency is enhanced...
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7061190 |
Circuit arrangement and operating device for operating lamps
The invention relates to circuit arrangements for operating lamps and to operating devices which contain such circuit arrangements. A first stage of a circuit arrangement according to the invention...
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7055962 |
System and method for managing projector bulb life
Projector bulb life is managed to achieve desired performance parameters, such as a maximum life mode or maximum brightness mode, by sensing bulb luminance and applied the sensed luminance with a...
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7057357 |
Rapid warmup light actuator
A rapid warmup light actuator is disclosed to solve the problems that the light actuator cannot rapidly warm up the lighting load in the prior art and that unstable light sources result from the...
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7053563 |
Circuit arrangement for operating light sources
In a circuit arrangement for operating light sources, inexpensive technologies for power factor correction can be used in combination. Owing to the combination of a dual charge pump and a valley...
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7053564 |
Ballast for a discharge lamp
The invention relates to ballast for a discharge lamp ( 16 ), comprising a direct-current supply phase ( 2 ), semiconductor switches ( 10, 11 ), operated at a high-frequency clock frequency for...
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7045967 |
Multi-lamp actuating facility
A lamp actuating device includes a number of lamps each having an output terminal, an inverter circuit coupled to the lamps to energize the lamps, a low frequency control unit coupled to the...
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7045970 |
Electronic ballast for a lamp to be operated with iterative voltage pulses
The invention relates to an electronic ballast for a dielectrically impeded discharge lamp (L), which ballast has an inductor (W 1 , W 2 , W 3 ) with a winding (W 2 ) that can be short-circuited.
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7042165 |
Driver circuit for LED vehicle lamp
A first vehicle lamp driver circuit for a light emitting diode (LED) array, the LED array having a first string of four LEDs in series and a second string of four LEDs in series. A first LED driver...
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7042164 |
Self light emitting display device
In order to realize, at a low cost, the function of an indicator which is brought to a light emitting state during a wait state, a panel 1 as a display section is constituted by self light...
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7042166 |
Circuit arrangement for operating electric lamps
The invention relates to a circuit arrangement for operating electric lamps ( 5 ), in particular dielectric barrier discharge lamps, having an input stage ( 1 ) in the form of a voltage-increasing...
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7038594 |
Led driver current amplifier
A circuit powering an electrical device based on a commanded current signal is provided. The circuit includes a linear current amplifier which sets a desired current flow. The circuit also...
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