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7609006 |
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....
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7576337 |
Power supply for an ion implantation system
A power supply system for an ion implantation system. In one particular exemplary embodiment, the system may be realized as a power supply system that includes a low frequency power inverter, 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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7518316 |
Half-wave rectification circuit with a low-pass filter for LED light strings
Disclosed is a low cost LED string circuit design that uses an inexpensive half-wave rectification and low-pass filter circuit that is designed to produce minimal flicker in the LED string that is...
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7453215 |
Illumination system having cold cathode started, illumination controlled gas discharge lamps in series
An illumination system having cold cathode started, illumination controlled gas discharge lamps in series, includes the parts of a voltage-adjustable full-wave voltage-doubler rectifier power...
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7449839 |
Structure of LED lighting chain
A LED lighting chain is disclosed to include a front plug, a rear plug, an AC-DC converter formed of four rectifying diodes, and a LED serial set, wherein the LED serial set has a voltage dropping...
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7276858 |
Decorative lighting string with stacked rectification
An improved decorative light string circuit comprises full bridge rectification located in or downstream of the front plug, wherein the rectification circuit contains one or more voltage reducing...
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7164237 |
Circuit arrangement for operating discharge lamps
A DC-AC converter in a half bridge configuration is used for operation with high pressure discharge lamps as well as low pressure discharge lamps. The converter consists in two switches (T 1 -T 2 )...
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6949889 |
Wide input voltage range light emitting diode driver
A current-regulating driver circuit for a light emitting diode (LED) maintains energization drive to and thereby illumination provided by the LED at a prescribed, substantially constant value, over...
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6630799 |
Resonant power supply and apparatus for producing vacuum arc discharges
The present invention relates to a vacuum arc discharge power supply. The power supply may be a high frequency resonant AC supply or it may be rectified to give resonant DC. The power supply of the...
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6501228 |
Full-wave driving circuit for multiple electroluminescent cells
A full-wave driving circuit for multiple electroluminescent lamps includes circuitry at a collective first end of the electroluminescent lamps for boosting of both positive and negative waves, and...
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6462485 |
EL driver for small semiconductor die
A driver for an EL lamp includes a voltage boost circuit and an H-bridge output having an AC diagonal and a DC diagonal. An EL lamp is coupled across the AC diagonal. A current path is coupled in...
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6459216 |
Multiple CCFL current balancing scheme for single controller topologies
The multiple lamp circuit for minimizing lamp current imbalance comprises at least one transformer comprising primary windings and secondary windings. Multiple lamps are coupled in serial to the...
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6211625 |
Electronic ballast with over-voltage protection
In an electronic ballast, a rapid start fluorescent lamp is powered by being parallel-connected with the tank-capacitor of a series-resonant LC circuit. Beating power for the lamp's cathodes is...
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6204609 |
Enhanced inverter for powering an EL lamp
A power supply for an EL lamp includes a boost circuit and four semiconductor switches connected as a bridge having an AC diagonal and a DC diagonal having one end grounded. The voltage boost...
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6172464 |
Compact screw-in fluorescent lamp
In a high-frequency electronic ballast, a fluorescent lamp is connected with and powered by way of a series-resonant LC circuit. A resistive load is connected with the LC circuit, thereby to...
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6166492 |
Low loss, electronic ballast
A low loss capacitive delivery system for converting a low voltage AC power source into a driving energy for a high voltage lamp is disclosed. The system involves delivering two energy loops with...
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6150761 |
Discharge lamp ballast circuit with charge pump igniter
A ballast for a compact fluorescent lamp includes a down-converter for operating the lamp with a DC current during stable operation and a charge pump for igniting the lamp. The converter includes...
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6121733 |
Controlled inverter-type fluorescent lamp ballast
Unfiltered full-wave-rectified 60 Hz power line voltage is supplied to a first self-oscillating series-resonance-loaded inverter, the high frequency output current from which is...
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6118225 |
High frequency discharge lamp operating circuit with resonant power factor correction circuit
A circuit arrangement comprising a DC-AC converter for operating a lamp (La). A first capacitor is connected across first and second inputs of the DC-AC converter. A first coil and a second...
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6100645 |
Ballast having a reactive feedback circuit
A circuit for energizing a load includes an inverter which provides a feedback signal to a rectifier for substantially linear operation of the rectifying diodes. In one embodiment, a ballast...
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6100642 |
Discharge lamp operating electronic device for improving the reliability, efficiency, and life of a hot-cathode discharge lamp
A discharge lamp operating electronic device is provided with a booster circuit for converting the direct-current power provided by a direct-current power supply to a predetermined operating...
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6091208 |
Lamp ignitor for starting conventional hid lamps and for starting and restarting hid lamps with hot restrike capability
An ignitor is provided to predictably and reliably start a conventional HID lamp, or to start or restart an HID lamp having a hot strike capability such as a high pressure xenon HPS lamp or similar...
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6091206 |
Electronic ballast system for fluorescent lamps
Electronic ballast system for fluorescent lights. A power oscillator connected to the primary winding of a power transformer for operation at a predetermined frequency in the range of 10 KHz to 5...
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6043610 |
Battery operated power supply including a low level boost and a high level boost
An EL lamp is driven by a power supply including a voltage boost circuit and a low power inverter. The boost circuit includes a level shifting capacitor to provide voltage doubling. The inverter...
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6008589 |
Single-switch, high power factor, ac-to-ac power converters
A single-switch ac-to-ac converters for driving ac loads which are particularly suitable for gas discharge lamp ballast applications based upon integration of automatic current shapers and...
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6008587 |
Fluorescent lamp electronic ballast control circuit
An electronic ballast control apparatus and method for fluorescent lamps includes applying a heating current through the filaments of the lamp, and delaying the application of arc current through...
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5998812 |
Amplifying-gate thyristor with an increased hold current
An amplifying-gate thyristor having an increased integrated circuit includes a main thyristor and an amplifying thyristor. The amplifying thyristor is of the gate turnoff-type. The main thyristor...
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5986410 |
Integrated circuit for use in a ballast circuit for a gas discharge lamp
Disclosed is an integrated circuit for use in a ballast circuit for supplying a.c. current to a resonant load circuit incorporating a gas discharge lamp and a resonant inductance and capacitance....
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5982109 |
Electronic ballast with fault-protected series resonant output circuit
An electronic ballast (100) for powering at least one gas discharge lamp (10) comprises an inverter (200) and an output circuit (300). Output circuit (300) comprises a resonant inductor (310), a...
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5982106 |
Self-protected series resonant electronic energy converter
An energy conversion device has a self-oscillating transistorized L-C series-resonant half-bridge inverter circuit having alternating resonant inductor current and adapted to deliver a high...
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5977721 |
Controlled power-factor-corrected ballast
Subject electronic ballast draws power from the power line with a power factor higher than 90%. The ballast consists of a power-factor-correcting rectifier circuit and an inverter circuit that...
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5977720 |
Method and apparatus for driving an electroluminescent lamp
An electroluminescent lamp is driven by a driving circuit that can supply an approximately sinusoidal signal, a bi-directional sawtooth signal or a single-ended sawtooth signal. Switches...
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5962984 |
High intensity lighting circuit
To provide a high intensity lighting circuit of improved efficiency and reduced electromagnetic interference generation, a DC xenon lamp is driven by a three phase AC source through a three phase,...
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5939832 |
Safety disconnection with asymmetric lamp power
A circuit is proposed for the AC voltage operation of a discharge lamp by ans of a coupling capacitor (C3) with a safety disconnection device, connected in series with the lamp for DC current...
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5925986 |
Method and apparatus for controlling power delivered to a fluorescent lamp
An improved ballast circuit for controlling the power delivered to a fluorescent lamp. The present invention uses a complex resonating circuit to dynamically adjust the power being delivered to the...
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5903107 |
Lighted switch apparatus
A display apparatus for illuminating a switch is provided which includes a switch having an on and off position to control power from a power supply to a device. A light source is located near the...
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5892332 |
Starter for a high-pressure gas discharge lamp
On one side, a high-pressure gas discharge lamp (10) is connected, by way of the secondary winding (16) of an ignition transformer (14), to a line (11) and, on its second side, to a second line...
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5883472 |
Circuit for operating a discharge lamp
The invention concerns a circuit for operating a discharge lamp with a habridge generator (T1, T2) wherein a turn-off transistor (T3) can stop the half-bridge generator The energy source for the...
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5880564 |
High-frequency operating circuit for a low-pressure discharge lamp with improved electromagnetic compatibility
A circuit is proposed for the high-frequency operation of at least one lamp with an active harmonic filter with at least one capacitive pump branch with a pump capacitor (C1; C2) for feeding the...
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5864212 |
Control system for providing power to a gas discharge lamp
A dimming control circuit provides power from an ac source to a compact fluorescent lamp. The circuit generally includes a resonant half-bridge inverter driven by a pulse-duration-modulated...
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RE35994 |
Variable control, current sensing ballast
The present invention is directed to an electronic ballast device for the control of gas discharge lamps. The device is comprised of a housing unit with electronic circuitry and related components....
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5844373 |
Power supplying apparatus, a plasma display unit, a method of converting a direct-current voltage and a method of adding two direct-current voltages
A power supply which inputs a first direct-current voltage from the outside and outputs a high direct-current voltage to a plasma display panel. The power supply connects the input direct-current...
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5786670 |
High-frequency converter for fluorescent lamps using an improved trigger circuit
A high frequency converter for driving a gas discharge lamp load is comprised of an input stage for receiving an AC input voltage and rectifying the input voltage to create a DC voltage source, an...
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5761058 |
Power converter apparatus for a discharge lamp
A power converter apparatus in which a switched capacitor circuit includes one or more sets of cells connected in series each having a capacitor as a voltage supply source and a bridge circuit for...
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5723952 |
Rare gas discharge fluorescent lamp device
The present invention provides a rare gas discharge fluorescent lamp device which is long in life and high in brightness and efficiency. The lamp device basically comprises a rare gas discharge...
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5717293 |
Strike enhancement circuit for a plasma generator
A strike enhancement circuit for a dc power supply, which can be a switched half-bridge supply, creates a high voltage at high impedance to initiate a plasma in a plasma chamber or sputtering...
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5714846 |
Minimum harmonic distortion operating circuit for at least one low-pressure discharge lamp
To substantially reduce harmonic distortion and improve the power factor of n operating circuit for a fluorescent lamp, a smoothing circuit (G) is interposed between the outputs from a power...
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5710487 |
Ballast circuit for gaseous discharge lamps without inductive electrical components or filaments
An improved energizing circuit for starting and regulating a gaseous discharge lamp. The circuit is 100% solid state and does not require the use of any inductive components or any filaments for...
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5684366 |
Lamp protection device
A lamp protection device includes a circuit to prevent a lamp from being switched on at full line voltage and which provides for the gradual heating of the filament to reduce the expansion rate of...
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