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6661072 |
Piezoelectric ceramic transistor
A piezoelectric ceramic transistor is formed from a single-layered or multi-stacked layers piezoelectric ceramic voltage transformer and a capacitor, the capacitor being series connected to an...
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6661182 |
Lamp ballast system having improved power factor and end-of-lamp-life protection circuit
A ballast system for use with a fluorescent lamp having two filaments disposed at opposite ends of the lamp. The ballast system has a DC input terminal for connection to a DC voltage source or for...
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6657399 |
Self-oscillating circuit for driving high-side and low-side switching devices with variable width pulses
A self-oscillating circuit for driving high-side and low-side switching devices, such as MOSFETs connected in a half-bridge configuration. The circuit alternately turns on the switching devices by...
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6657403 |
Circuit arrangement for operating a fluorescent lamp
A method and circuit arrangement for operating a fluorescent lamp (LA), comprising a half-bridge arrangement ( 12 ) whose output signal can be fed to a load circuit (LK; 16 ), it being possible to...
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6657400 |
Ballast with protection circuit for preventing inverter startup during an output ground-fault condition
A ballast ( 10 ) for powering a gas discharge lamp load includes an inverter ( 200 ) and a protection circuit ( 400 ) for preventing start up of the inverter ( 200 ) in response to a ground fault...
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6646389 |
Discharge lamp ignition device, equipment and image forming apparatus
An ignition device which ignites a discharge lamp comprises high-frequency voltage generator, a feeding harness line, and a lowpass filter. The high-frequency voltage generator includes a switch...
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6642670 |
Ballast converter with power factor and current crest factor correction
A ballast converter with a power factor and crest factor correction to be connected to an input source for providing an input voltage. The ballast converter includes a rectifier, a power converter,...
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6642668 |
Discharge lamp device for reducing noise radiation and surge pulse current
Providing a discharge lamp device to reduce noise radiation and to reduce a surge pulse current resulting from a shield sheath involves providing a ballast, including a DC/DC conversion circuit for...
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6642655 |
High-pressure metal halide discharge lamp and a lighting apparatus using the lamp
A high-pressure metal halide discharge lamp includes a sealed light-transmitting discharge vessel, first and second electrodes disposed in the discharge space, and a pair of conductive wires...
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6642669 |
Electronic dimming ballast for compact fluorescent lamps
The operating frequency of a ballast is sufficiently far from resonance that, when a compact fluorescent lamp is dimmed to about one percent light output level, the ballast is operating with an...
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6639366 |
Power supply circuit for a cold-cathode fluorescent lamp
A power supply circuit for a cold-cathode fluorescent lamp (CCFL). The power supply circuit converts a DC voltage to a high AC voltage for driving the CCFL. The power supply circuit includes: a...
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6639367 |
Control circuit employing preconditioned feedback amplifier for initializing VCO operating frequency
A control circuit for a piezo transformer based power supply includes oscillator circuitry, drive circuitry, sense circuitry, and feedback circuitry collectively operating to regulate an...
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6639369 |
Electronic dimmable ballast for high intensity discharge lamp
A dimmable electronic ballast for an HID lamp includes a rectifier stage for rectifying an AC input and providing a rectified DC output, a power factor correction stage for modifying a power factor...
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6639368 |
Programmable PWM module for controlling a ballast
A programmable Pulse Width Modulation (PWM) generator is disclosed wherein a single module provides four different signals utilized to control a ballast for a light device. By changing the value in...
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RE38273 |
Baseband RF voltage-current probe
An RF probe for a plasma chamber picks up current and voltage samples of the RF power applied to an RF plasma chamber, and the RF voltage and current waveforms are supplied to respective mixers. A...
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6630797 |
High efficiency driver apparatus for driving a cold cathode fluorescent lamp
An inverter circuit for a gas discharge lamp having a primary circuit having a DC voltage supply, a transformer, a switching circuit including a first switch and a second switch for controlling a...
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6628091 |
Electronic switch for a bi-level fluorescent lamp fixture
The present invention provides electronic switching for a bi-level fluorescent lamp fixture that allows power to be switched on and off to a group of lamps in a fixture when more or less...
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6628090 |
Resonant driving system for a fluorescent lamp
A resonant driving system for a fluorescent lamp having one end connected to a primary winding of a transformer. The driving system includes an inductor inserted between an input section of the...
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6624595 |
Resonant energy recovery for electro-luminescent lamp panels
Circuits and methods employing the inherent capacitance of an electro-luminescent lamp in a resonant circuit to recover the energy otherwise lost in electro-luminescent lamp driver circuits to...
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6624599 |
Compact single-stage electronic ballast circuit for emergency lighting applications
A compact single-stage electronic ballast circuit for emergency lighting applications, integrating the functions of a flyback charger, a flyback discharger and a half-bridge series resonant...
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6624600 |
Lamp power measurement circuit
A lamp power measurement circuit measures average power delivered to a gas discharge lamp. The circuit includes a voltage sensor having a first measurement output representative of AC voltage...
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6621224 |
Light-controlling device used for vehicle
A light-controlling device of this invention includes a controlling circuit having a function for turning an incandescent lamp and an LED off simultaneously, which have different minimum voltages...
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6621236 |
Discharge lamp lighting device and illumination device
This invention provides a discharge lamp lighting device and illumination device which can be miniaturized with high power factor and also is inexpensive. In the discharge lamp lighting device, in...
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6621237 |
Gas-discharge lamp lighting apparatus with optimized circuit configuration
A gas-discharge lamp lighting apparatus includes: a power conditioning unit regulating power supplied from a power source, and outputting voltages with mutually different levels from two output...
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6614192 |
Electronic ballast circuit
A driver waveform ( 30 ) for a gas discharge lamp is produced by a ballast circuit. The waveform ( 30 ) has a substantially vertical rising portion 831 ) forming an instantaneous, of time 10...
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6611112 |
Appliance for discharge lamps with reliable starting
Appliance for discharge lamps, which has a load circuit with a resonance point at a resonant frequency fres. In order to start the discharge lamps, the load circuit is fed with a square-wave source...
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6611111 |
Load drive circuit
A load drive circuit is disclosed, comprising: a MOSFET 24 including a power supply terminal connected to a lamp load 1, and turned ON/OFF to supply a power supply voltage to the lamp load 1 ...
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6608450 |
High frequency, high efficiency electronic lighting system with sodium lamp
The present invention is a high frequency, high efficiency start and quick restart system including a lamp. It includes hook ups for connecting and applying a power input to circuitry; a switch for...
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6608452 |
Xenon power supply
A transformerless, microprocessor controlled xenon power supply including: a DC supply which rectifies and filters the incoming AC electrical power; a plurality of current path connected between...
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6605905 |
Discharge lamp driving apparatus and lighting fixture using the apparatus
A discharge lamp driving apparatus includes, a direct current power supply having a rectifier, an inverter circuit, which has stable and unstable output terminals, converting a direct current power...
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6605908 |
Stopper protection circuit of electronic ballast for fluorescent lamp
A (vibration) stopper protection circuit of an electronic ballast for fluorescent lamps. The electronic ballast has an inverter to convert a direct current source into a square-wave source, and to...
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6603674 |
Electronic transformer with good immunity against high-voltage pulses
Electronic transformers with a self-excited half bridge can be destroyed by high-voltage pulses from the mains supply lead. This can happen by the high-voltage pulse initiating a starting operation...
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6603274 |
Dimming ballast for compact fluorescent lamps
A fluorescent lamp ballast circuit including a phase cut dimmer connectable to a source of AC power, the selectable phase cut dimmer and an electronic switch having a trigger voltage and a...
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6600271 |
Method and apparatus of an improved electronics ballast circuit
A ballast circuit adaptive to changes in the input voltage capable of providing a “floating” high output voltage for the operation of fluorescent lamps. The present invention employs an output...
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6597127 |
Discharge lamp operating apparatus, self-ballasted discharge lamp, dimmer and illumination kit for dimming
A discharge lamp operating apparatus includes a discharge lamp; a dimmer for performing phase-control with respect to an input power source; and a ballast circuit for dimming and operating the...
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6597130 |
Driving apparatus of discharge tube lamp
A driving apparatus of a discharge tube lamp includes a voltage source; a plurality of AC conversion circuits for boosting a voltage supplied from the voltage source and generating a plurality of...
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6593703 |
Apparatus and method for driving a high intensity discharge lamp
A circuit arrangement and control thereof for igniting a high intensity discharge lamp, for reducing current stresses imposed on semiconductor devices during a polarity transition of a lamp voltage...
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6593704 |
Method and ballast for feeding a UV light low pressure radiator
The invention relates to a method and a ballast for feeding a UV light low pressure radiator. The UV light low pressure radiator is ignited and subsequently fed with direct current. The polarity of...
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6590351 |
Operating device for at least one electric lamp with a control input, and an operating method for electric lamps connected to such an operating device
The invention relates to an operating method and an operating device for at least one electric lamp ( 11 ), which device has a control input ( 13, 14 ) for prescribing a setpoint for the brightness...
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6590350 |
Lighting system with a high intensity discharge lamp
A lighting system ( 1 ) having a high intensity discharge lamp ( 16 ) mounted replaceably in a holder ( 25 ) which connects to an electronic control ( 8 ) which includes a variable frequency...
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6586892 |
Method of and device for operating a gas discharge lamp
A method of and a device for operating a gas discharge lamp which is fed with an alternating voltage or an alternating current and wherein the instantaneous power of the lamp is increased at given...
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6586890 |
LED driver circuit with PWM output
The driver circuit for light emitting diodes (LEDs) of the present invention provides power to LEDs using pulse width modulation (PWM). The driver circuit 100 uses current feedback to adjust...
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6580229 |
Discharge lamp lighting device
A discharge lamp driving device capable of detecting a lamp life end reliably in a high or low temperature environment for circuit protection, yet preventing the occurrence of the cataphoresis...
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6580222 |
Inverter for driving EL lamp and light emitting diodes
An inverter for driving an EL lamp is tapped to provide voltage or current for driving one or more EL lamps, LEDs, and an LCD. In accordance with one aspect of the invention, one side of the pump...
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6577078 |
Electronic ballast with lamp run-up current regulation
An electronic ballast with lamp run-up current regulation. In one aspect, the electronic ballast comprises an input stage coupled to an AC source, the input stage converting an AC voltage to a...
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6577076 |
Adaptive control for half-bridge universal lamp drivers
An adaptive compensation circuit for controlling a universal lamp driver coupled to a lamp is disclosed. The adaptive compensation circuit utilizes an identification of a lamp type of the lamp to...
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6577079 |
Electronic ballast with intermediate circuit regulation
An electronic ballast for at least one gas discharge lamp (LA) comprises a rectifier circuit ( 2 ) connectable to an a.c. voltage source (U 0 ), a smoothing circuit ( 3 ), connected to the output...
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6577077 |
Circuit arrangement
In an electronic ballast for operating a discharge lamp at a high frequency, a single feedback and a double pump feedback are implemented in a combined way. The resulting electronic ballast...
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6573666 |
Digital regulation of fluorescent lamps
A method to control the illumination intensity of a gas discharge lamp is achieved. The method comprises, first, converting an analog lamp illumination signal into a digital lamp illumination...
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6573664 |
High efficiency high power factor electronic ballast
A method and apparatus for driving a ballast in critical discontinuous mode (CDCM). The method provides for zero loss switching in order to maximize efficiency, and also provides controllable input...
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