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7609007 |
Dimmer adaptable to either two or three active wires
A dimmer ( 42 ) adaptable to either two (H, DH) or three (H, N, DH) active wires includes a first full-wave rectifier (D 1 , D 2 , D 3 , D 4 ) across an AC power hot (H) terminal and a dimmer hot...
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7586272 |
Cold cathode fluorescent lamp, cold cathode fluorescent lamp driving apparatus, cold cathode fluorescent lamp apparatus, liquid crystal display apparatus, control method for cold cathode fluorescent lamp, and control method for liquid crystal display apparatus
A cold cathode fluorescent lamp apparatus has a cold cathode fluorescent lamp which can be lit readily and in which leak current is minimized. A pair of internal electrodes are disposed on an inner...
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7579788 |
Power supply system of a light source and a light source actuating method
A power supply system of a light source includes a luminance control unit, luminance adjusting unit, control circuit and voltage transformer. The luminance control unit is for receiving a turn-on...
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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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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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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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7554254 |
Flat fluorescent lamp
The present invention provides a flat fluorescent lamp. The flat fluorescent lamp comprises a single plate. Consequently, the flat fluorescent lamp is structurally safe, brightness of the flat...
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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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7528551 |
LED control system
In one embodiment, an LED system is controlled to have a substantially unity power factor.
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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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7501773 |
Multistrike gas discharge lamp ignition apparatus and method
A gas discharge lamp has a gas and has a cathode, an anode, and an ignition electrode. Individual discharges of a series of lamp discharges are spaced at least one millisecond from each other, and...
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7495398 |
Discharge lamp lighting apparatus
A discharge lamp lighting apparatus includes: an inverter circuit including a switch circuit and a high-voltage transformer; a step-up circuit connected at the input stage of the inverter circuit;...
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7486032 |
Apparatus for driving LED arrays
In an apparatus for driving LED arrays, a dimming/size setter sets each of driving voltages for a plurality of red, green and blue LED arrays in response to at least one of a dimming signal and a...
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7477022 |
System and method for driving a multi-lamp
A system for driving a multi-lamp, and more particularly to, a system for driving a multi-lamp for driving a parallel arrangement of a plurality of discharge lamps and a method of driving a...
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7463070 |
Switching device for driving LED array by pulse-shaped current modulation
A circuit drives an LED array and controls the brightness of the LED array by regulating the current flowing through the array. The LED array is driven by a pulse-shaped current of which the mean...
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7459861 |
Lamp containing voltage conversion circuit including forward/reverse hybrid phase-control clipping circuit
A lamp contains a lamp voltage conversion circuit which includes a forward/reverse hybrid phase-control clipping circuit that clips a load voltage and provides an RMS load voltage to the lamp. The...
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7456586 |
Voltage controlled light source and image presentation device using the same
A device ( 300 ) includes a driver circuit ( 200 ) having a field effect transistor (FET) ( 30 ), acting as a current sink, a current sense network ( 10 ), an operational amplifier (opamp) ( 20 ),...
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7449841 |
Charge limited high voltage switch circuits
High voltage switches are configured with a junction transistor driven with a transformer coupled AC drive signal in the common base configuration or driven by a capacitor coupled charge pump. The...
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7446483 |
Backlight light source drive device
This backlight light source drive device includes a plurality of backlight light source drive circuits which drive a plurality of respective backlight light sources, and a control circuit which...
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7432663 |
Circuit for igniting a high intensity discharge lamp
A circuit ( 300 ) for igniting a high intensity discharge (HID) lamp comprises input terminals ( 302,304 ), output terminal ( 306,308 ), a charging circuit (R IGN ,C IGN ), a transformer ( 320 )...
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7425804 |
Lamp drive device of projector
A projector includes a lamp drive circuit which drives a lamp, and a lamp drive current detection unit which detects the lamp drive current. Based upon the lamp drive current which is detected, the...
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7423385 |
System and method for controlling voltage on discharge capacitors which control light energy from flash lamps
A system and method are described for controlling voltage on discharge capacitors which control light energy from flash lamps, wherein the method includes measuring over time an operational...
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7408329 |
Power supply unit for gas discharge processes
A method of generating an output DC voltage of a gas discharge process voltage supply unit, in which in a first voltage transformation stage a first DC voltage is transformed into a second DC...
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7408309 |
Input current limiting circuit and driving device using the same
A driving device for driving a light source module ( 12 ) includes an input current limiting circuit ( 10 ) and an inverter ( 11 ). The input current limiting circuit includes an input current...
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7402956 |
Ballast with zero voltage switching converter
A ballast ( 10 ) for powering at least one gas discharge lamp ( 20 ) comprises a switching converter ( 100 ) and an inverter ( 900 ). Switching converter ( 100 ) includes a transistor ( 130 ) and a...
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7391164 |
Visual notification methods for candy-bar type cellphones
A wireless handheld communications device with a liquid crystal display, especially, a field sequential liquid crystal display, includes a visual notification for a powered up, inactive state. The...
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7378804 |
Ballast for a discharge lamp with integrated control circuit for controlling switching element of dc power supply and inverter circuit
The ballast of the present invention includes a DC power supply, an inverter circuit, a load circuit, and an integrated control circuit. The integrated control circuit controls the switching...
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7378803 |
Igniting pulse booster circuit
A pulse booster circuit ( 10 ) comprises a first pulse transfer path ( 41 ) and a second pulse transfer path ( 42 ) extending between input terminals ( 11 a ; 11 b ) and output terminals ( 12 a ;...
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7372216 |
Constant brightness control for electro-luminescent lamp
A ballast ( 11 ) includes a variable output DC converter source ( 12 ) and an inverter circuit ( 14 ) arranged to provide AC output voltage to an electro-luminescent (EL) lamp ( 16 ). A Q factor of...
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7372211 |
Cold cathode tube lighting device and driving method and integrated circuit to be used in same
A cold cathode tube lighting device is provided which is capable of obtaining stable luminance when a cold cathode tube is driven by applying voltages to input terminals on both ends of the cold...
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7362058 |
Method and device for controlling the light intensity in a multi-lamp illumination device for a display panel
For controlling the light intensity in a multi-lamp illumination device an automatic sequencing of the PWM dimming distributes the burst dimming pulses during the display's frame period....
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7358689 |
Phase-control power controller for converting a line voltage to a RMS load voltage
A phase-control power controller converts a line voltage to an RMS load voltage and includes a phase-control clipping circuit that clips a load voltage to provide the RMS load voltage. The power...
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7358683 |
Automatic PWM controlled driver circuit and method
A load driver circuit includes an output transistor configured to drive a load. The circuit further includes a power supply, and a power supply evaluation circuit configured to sense a...
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7358680 |
Bistate HID operation
Bi-state power operation of an HID lamp system. A power mode control selection determined where a high power mode and a low power mode are selectable. A modulation is determined to generate a...
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7355353 |
Illumination control circuit
It is an object of the invention to provide an improved illumination control circuit comprising a light emission element FL, a driving element 5 for driving the light emission element FL, and a...
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7345432 |
Inverter circuit for lighting backlight of liquid crystal display and method for driving the same
A separately-excited inverter circuit includes: an oscillator which generates a high-frequency voltage pulse by mixing a high-frequency voltage pulse of a first frequency and a high-frequency...
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7339330 |
Methods and circuits for instant hot restart of high intensity discharge lamps
A lamp ballast for operating a high intensity discharge lamp includes an electronic ballast circuit to supply an operating voltage to the discharge lamp, and an igniter circuit to supply starting...
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7339328 |
Method of shaping light pulses emitted by an arc lamp
A method of operating an arc lamp. The method includes introducing a primary voltage pulse into the arc lamp, thereby inducing a primary flow of electrical current in the arc lamp. The method also...
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7334917 |
Illumination device
An illumination device comprising at least four luminous units ( 1, 2 ), the light emitted by at least two of the four luminous units ( 1, 2 ) being suitable for being mixed to form white light....
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7332873 |
Electrical circuit for fluorescent lamps
A portable fluorescent task lamp comprising at least two fluorescent bulbs of any wattage up to forty Watts and of either a non-starting type or a self-starting type; and an electronic ballast...
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7332870 |
Driving voltage controller for light-emitting source
An initial driving voltage fixing a desired luminance of a light-emitting source is set at a voltage lower than that of a power supply; the light-emitting source is driven by applying a...
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7330002 |
Circuit for controlling LED with temperature compensation
A circuit for controlling an LED with temperature compensation is employed in the LED-based system. The circuit of the invention linearly controls luminance and color of the LED according to...
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7321203 |
LED dimming control technique for increasing the maximum PWM dimming ratio and avoiding LED flicker
Circuitry and methodology for providing LED dimming control in a LED driving system having a switching regulator for providing power supply to drive the LED. The switching regulator includes a...
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7315137 |
Method and apparatus for a CCFL driving device
A driving device is provided for a cathode fluorescent lamp (CCFL) circuit, comprising a voltage generator outputting a driving voltage and a controller coupled thereto. The controller directs the...
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7315135 |
Load driving device and load driving method
Provided is a load driving device controlling a drive of a load including a driver for periodically turning on/off a current according to a switching clock signal and supplying a average driving...
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7304438 |
Method and apparatus for preventing instabilities in radio-frequency plasma processing
A method and apparatus for controlling a power supply to prevent instabilities due to dynamic loads in RF plasma processing systems, operating at frequencies of from 1 MHz and up, uses a...
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7294971 |
Balancing transformers for ring balancer
A ring balancer comprising a plurality of balancing transformers facilitates current sharing in a multi-lamp backlight system. The balancing transformers have respective primary windings separately...
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7291984 |
Method of reducing RMS load voltage in a lamp using pulse width modulation
A method of converting a line voltage to an RMS load voltage in a lamp includes modulating a load voltage with a pulse width modulation circuit that is entirely within the lamp and provides an RMS...
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7288898 |
Automotive high intensity discharge lamp ballast circuit
An electronic ballast for driving a high intensity discharge (HID) lamp is provided. The electronic ballast includes a voltage boost stage for receiving a DC input voltage and outputting a boosted...
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7285920 |
Method and circuit arrangement for operating a high-pressure gas discharge lamp
A method and a circuit arrangement for the operation of a high-pressure gas discharge lamp (HID [high intensity discharge] lamp or UHP [ultra high performance] lamp) is described, which lamp is...
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