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7586098 |
Ion stripper device made of carbon nanotubes or fullerenes
A system and method for developing a solid state stripper device is described that more effectively strips off negative carbon ions to produce positively charged carbon ions. In one embodiment the...
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7576494 |
High voltage discharge lamp lighting method, lighting apparatus and image device using that lighting apparatus
The present invention applies to provide a lighting method of a high pressure discharge lamp dedicated particularly for image equipments in which re-lighting when turning ON the switch again...
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7420336 |
Method of controlling cathode voltage with low lamp's arc current
The embodiment disclosed herein relates to systems and methods to provide improvements to power delivery systems employed with lamps in general and fluorescent lamps in particular. In accordance...
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7268496 |
Discharge lamp lighting device and lighting system
When a discharge lamp is preheated, impedance of a filament electrode of the discharge lamp is computed. In accordance with the computed impedance, preheating and lighting of the discharge lamp are...
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7199526 |
Electronic ballast
An electronic ballast capable of extending life of the fluorescent lamp is disclosed. The electronic ballast according to the present invention comprises a DC/AC converter, a fluorescent lamp, a...
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7193368 |
Parallel lamps with instant program start electronic ballast
In a current fed electronic ballast multiple lamps are operated in a parallel circuit arrangement. The ballast provides pre-heating to the cathodes of the lamps for a period of time before an open...
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7183714 |
Ballast with relamping circuitry
An apparatus for detecting the reconnection of a lamp filament to an electronic ballast driving a fluorescent lamp. A control circuit controls an inverter circuit to providing power to a filament...
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7119490 |
Starter for minimizing damage to lamp electrodes of a discharge lamp at startup
A starter for a discharge lamp is disclosed for operation from an AC supply voltage. The starter comprises a first terminal for connection to a first lamp electrode, a second terminal for...
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6972531 |
Method for operating at least one low-pressure discharge lamp
A method for operating at least one low-pressure discharge lamp having heatable lamp electrodes, in which, during the preheating phase of the lamp electrodes, the type of lamp is identified. In...
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6943395 |
Phase random access memory with high density
A phase random access memory including a plurality of access transistors, each access transistor including a drain region, and a phase-changeable film shared by the plurality of access transistors....
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6936970 |
Method and apparatus for a unidirectional switching, current limited cutoff circuit for an electronic ballast
In accordance with one aspect of the present application, a lamp inverter circuit includes a switching portion that converts a bus voltage signal into an alternating current signal. An input...
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6911778 |
Ignition control circuit for gas discharge lamps
The disclosure includes an ignition control circuit comprising a transformer having at its secondary side an operating winding, and at least one filament winding. In a pre-heating phase, only the...
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6906468 |
Ballast device for uv radiator and also method and device for disinfecting water
The invention relates to a novel ballast device for pre-heating, starting and operating at least one UV emitter, constructed in the form of a gas discharge lamp with two heating coils lying...
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6858987 |
Flash lamp unit and flash radiation device
The object of the present invention is to provide a flash lamp unit with a long service life which allows a high radiant efficiency to be obtained and a flash radiation device demonstrating...
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6838834 |
Lighting system and electric power supplier for the same
An electronic ballast of a lighting system includes an output power supplier and a heater power supplier. The output power supplier is configured to supply electric power to a lamp of the lighting...
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6806657 |
Device for operating discharge lamps
A device for operating a plurality of discharge lamps ( 71, 72 ) is to be fashioned cost effectively. Two lamps ( 71, 72 ) are therefore operated in a single load circuit. In the preheating phase,...
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6771025 |
Magnetron controller with transformer controlling the inrush current
A control unit for a magnetron, the circuit being supplied form a source of a.c. voltage and comprising a power switch, a process controller/firing circuit for the power switch and first and second...
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6750469 |
Phase change nonvolatile storage device and drive circuit
In a phase-change nonvolatile storage device using a phase-change material as storage cells, which is improved to overcome a basic problem involved in conventional devices of this type and...
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6657402 |
Portable device with reduced power dissipation
A low power portable device includes a terminal ( 2 ) for connection of the device to a power source. A rectifier ( 3 ) is connected to the terminal and a half-bridge circuit ( 4 ) is connected to...
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6621226 |
Microwave oven and method for controlling voltage thereof
A microwave oven comprises a magnetron having an anode, a cathode and a filament, and a high voltage transformer having a primary coil and a secondary coil for supplying a high voltage to the...
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6570346 |
Circuit for flashing fluorescent lamps
A circuit for flashing a fluorescent lamp. The circuit includes a first and second terminal for coupling the circuit to a fluorescent lamp circuit. The terminals receive an AC power source. A...
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6567080 |
Image display apparatus and control method thereof
In an image display apparatus, based upon such a relationship among previously measured power consumption in a power save mode, an application voltage and application time thereof, and also rising...
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6566818 |
High-efficiency and light-adjustable lighting means of two-electrode lamp
A lighting and starting device for two-electrode lamp includes a plurality of voltage-multiplier rectifying circuits parallelly connected to two electrodes of the lamp with stepping voltages, for...
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6531825 |
Method and apparatus for supplying power for a vacuum fluorescent display (VFD) filament
A VFD driver circuit includes a DC power supply coupled to cascaded first power operational amplifier (POA 1 ) and second power operational amplifier (POA 2 ). The POA 1 is a self-oscillating...
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6501235 |
Microcontrolled ballast compatible with different types of gas discharge lamps and associated methods
A ballast compatible with different types of gas discharge lamps includes a power supply and a controller connected to the power supply. The controller includes a memory having a plurality of...
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6501225 |
Ballast with efficient filament preheating and lamp fault protection
A ballast ( 10 ) for powering a gas discharge lamp ( 20 ) having heatable filaments ( 22,24 ) includes a filament heating and protection circuit ( 300 ) that provides preheating of the filaments,...
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6426598 |
Control gear for fluorescent lamp
A control gear for a fluorescent lamp, comprising a voltage source and an ignition and supply circuit comprising an inductive component and a capacitance. The control gear also comprises a...
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6411041 |
Non-thermionic fluorescent lamps and lighting systems
A standard bi-pin, non-thermionic fluorescent lamp comprising a fluorescent envelope having a length selected from about two-, four- and eight-foot lengths and a pair of electrode ends, an...
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6359387 |
Gas-discharge lamp type recognition based on built-in lamp electrical properties
A gas discharge lamp has an impedance element such as a capacitor connected to at least one electrode heater, to produce a heater impedance which falls within a range which is unique to lamps of...
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6339299 |
Preheating circuit for detecting the filament temperature of fluorescent lamps
A preheating circuit for a fluorescent lamp is provided. The preheating circuit includes a filament detecting circuit indirectly detecting a filament resistance in a fluorescent lamp by measuring a...
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6204601 |
Device for controlling a magnetron filament current based on detected dynamic impedance
The present invention refers to a method for controlling a magnetron filament current. The control is provided by detecting the dynamic impedance or a noise level of the magnetron and by...
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6147455 |
Gas discharge lamp ballast circuit with electronic starter
A ballast circuit with an electronic starter for a gas discharge lamp having a pair of cathodes is disclosed. The circuit comprises a main current path with a first leg connected to one cathode of...
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6114810 |
Electronic ballast circuit for fluorescent lamps which have a high Q factor and high resonance voltage
An electronic ballast circuit for fluorescent lamps, said circuit comprises an anti-interfering circuit, a rectifying circuit, a filtering circuit, a frequency-converting circuit and a resonant...
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6043606 |
Discharge lamp device having a preheating electrode circuit
The invention relates to a circuit arrangement for operating a discharge lamp with a high frequency current comprising a power feedback circuit and a electrode preheater. The circuit arrangement...
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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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5986408 |
Discharge lamp with heating electrode circuit
The invention relates to a circuit arrangement for operating a discharge lamp with a high frequency current comprising a power feedback circuit and an electrode preheater. The circuit arrangement...
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5973455 |
Electronic ballast with filament cut-out
An electronic ballast for a gas discharge lamp includes an AC to DC converter for changing alternating current at power line voltage to direct current and an inverter powered by the converter and...
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5952788 |
Vacuum fluorescent display filament drive circuit
A drive circuit for controlling a vacuum fluorescent display is provided. A charge storage device is connected between signal ground or a voltage supply and a display element. One multiway switch...
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5939836 |
Discharge lamp lighting apparatus and lighting apparatus
A discharge lamp lighting apparatus of the present invention includes an inverter to convert input DC voltage into high frequency voltage and supply the converted high frequency voltage to a...
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5925982 |
Power supply circuit for intermittently actuating a filament of a vacuum fluorescent display
A power supply circuit for a filament of a vacuum fluorescent display includes an LC series circuit and a capacitor. A first end of the LC series circuit is connected with a secondary winding of a...
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5920153 |
Power supply for light sources, particularly for the quick ignition of fluorescent lamps and the like
A power supply for light sources, particularly for fluorescent lamps and the like, comprising capacitive means (1) that are connected to the mains (9) and are adapted to supply rectifier means (2)...
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5903105 |
Apparatus and method for controlling lighting of fluorescent lamp for refrigerator
A fluorescent lamp lighting control apparatus and method for use in a refrigerator is provided. Here, power is supplied according to opening of a refrigerator door and a fluorescent lamp is...
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5877592 |
Programmed-start parallel-resonant electronic ballast
A family of programmed start parallel-resonant electronic ballast circuits operate in a first mode during a preheat interval following application of power to the ballast, and then afterwards...
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5859504 |
Lamp ballast circuit with cathode preheat function
A ballast circuit for a gas discharge lamp contained within a resonant load circuit has resistively heated cathodes. A d.c.-to-a.c. converter circuit supplyies a.c. current to the resonant load...
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5854538 |
Circuit arrangement for electrode pre-heating of a fluorescent lamp
A circuit arrangement used with electronic ballast equipment has an inverter which supplies a high-frequency half-bridge voltage to at least one load circuit having a lamp throttle, a fluorescent...
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5838110 |
Apparatus and method for starting and controlling a fluorescent tube
A starter unit for a fluorescent tube includes in parallel across two terminals, first and second main thyristors head-to-tail connected and a zener protection diode. The gate of the first...
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5825133 |
Resonant inverter for hot cathode fluorescent lamps
A fluorescent lamp drive circuit is disclosed. The fluorescent lamp drive circuit includes first filament drive circuitry coupled to the filaments of the lamp for driving the fluorescent lamp with...
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5801491 |
Supply circuit for discharge lamps with means for preheating the electrodes
The circuit for firing and supplying a discharge lamp, includes: a load circuit (10), with at least one discharge lamp (L) and a voltage supply for supplying a discharge lamp, a subportion of...
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5789866 |
Electronic ballast with reversely wound filament winding
An electronic ballast includes a series resonant inductor and capacitor and a filament winding magnetically coupled to said inductor. The filament winding forms a closed circuit with a filament in...
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5751117 |
Modular fluorescent track lighting
A modular ballast system particularly suited for strip lighting installations has ballast modules on opposite ends of each fluorescent lamp tube, each module having lamp connectors for receiving...
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