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6841952 |
Electronic stabilizer
An electronic stabilizer includes a high frequency output transformer which is connected in a primary side with a frequency modulation/power amplifying circuit, and in a secondary side with a...
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6836078 |
Circuit for lighting HID lamp
A lighting circuit of confirming the insulation property of an HID lamp and a lighting circuit upon starting the operation of the HID lamp to previously prevent damages of the main circuit, and...
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6836081 |
LED driver circuit and method
An LED driver circuit and method are disclosed where a plurality of arrays of light emitting diodes each have a transistor connected to each respective array of light emitting diodes. A PWM...
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6836083 |
Illumination light supply system
An illumination light supply system that can save users from the task of replacing defective light source lamps with proper ones, enabling the users to use illumination light over an extended time...
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6836077 |
Electronic elimination of striations in linear lamps
The present invention provides a ballast circuit powered by a system power source. The ballast, in operative connection with the system power source, is an inverting type of ballast designed to...
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6836082 |
Ballast and method of feeding a fluorescent lamp
A ballast ( 1 ) for feeding a fluorescent lamp ( 9 ), comprising power supply means ( 2 ) for supplying a stabilised power to the lamp ( 9 ), dimming means ( 3 ) for adjusting said power, a...
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6833678 |
Circuit arrangement for operating discharge lamps
Circuit arrangement for operating discharge lamps (LP), having the following features: A power factor correction device (PFC) provides an intermediate circuit voltage; an inverter (INV), which...
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6831422 |
Operating circuit with an improved power supply for a driver circuit
The invention relates to the supply of power to a driver circuit (V) for a switching transistor (T) in an operating circuit, in particular for lamps. The supply is provided via a pump circuit with...
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6831423 |
High Q impedance matching inverter circuit with automatic line regulation
An inverter circuit includes an input section configured to receive voltage from a voltage source and to input the voltage to the circuit. A switching network is connected to receive the input...
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6831426 |
Electronic device, or dimmer, for regulating the power supply applied to a load
The invention concerns an electronic device, or dimmer, for regulating the power supply applied to a load ( 4 ), the device comprising an insulated gate bipolar transistor or IGBT ( 1 ), the IGBT (...
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6831421 |
Shunt-induced high frequency excitation of dielectric barrier discharges
An ionizing discharge device operating arrangement wherein initiation of discharges in for example a dielectric barrier discharge device is accomplished by a short circuit shunting of the charged...
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6828737 |
Discharge lamp operating circuit with a current regulation circuit and a circuit for detection of the proximity to capacitive operation
The invention relates to an operating circuit for a discharge lamp with a current regulation circuit for regulating the lamp current and a detection circuit for identifying proximity to capacitive...
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6819057 |
Ballast self oscillating inverter with phase controlled voltage feedback
A self-oscillating ballast inverter circuit for powering a gas discharge lamp. The circuit is used in a ballast inverter to compensate positive resonance frequency shift in the inverter load during...
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6819062 |
Discharge lamp lighting apparatus, light source apparatus and projection type display apparatus
A circuit for supplying an ignition voltage to a discharge lamp includes a capacitor for charging a supplied voltage, a transformer for stepping-up the charged voltage of the capacitor, a switching...
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6815908 |
Dimmable self-oscillating electronic ballast for fluorescent lamp
A simple, low-cost ballast circuit for adjusting the lumen output of a gas lamp. A number of ballast circuits are provided for a gas lamp, such as a fluorescent lamp. Specifically, a variable...
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6815906 |
Gas discharge lamp drive circuitry
An apparatus and method for driving a gas discharge lamp, and in particular for dimming fluorescent lamps or tubes. An electronic circuit for controlling a gas discharge lamp is connected to an...
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6815912 |
Discharge lamp lighting apparatus and discharge lamp apparatus
A discharge lamp lighting apparatus which can prevent an increase of loss and a rise of temperature in the area where discharge lamp tube voltage is low. A power conversion circuit converts the...
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6809483 |
Method and apparatus for arc detection and protection for electronic ballasts
An electric arc detection apparatus and method is based on AC current rectification phenomena in air plasma that causes low frequency amplitude modulation of high frequency currents and voltages in...
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6808287 |
Method and apparatus for a pulsed L.E.D. illumination source
Improved method and apparatus for hand-held portable illumination. A flashlight and corresponding method are described. The flashlight includes a housing, a plurality of LEDs, and an electrical...
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6798153 |
Method of regulating power in a high-intensity-discharge lamp
A system and method of controlling power to a high-intensity-discharge lamp is provided. A voltage sensor determines voltage across the lamp. A current sensor determines current through the lamp. A...
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6794827 |
Multiple ballasts operable from a single DC bus
A plurality of lighting ballasts ( 12, 14, 16 ) draw power from a single DC bus signal. A power factor correction circuit ( 10 ) rectifies and smoothes AC power to produce the DC bus signal. In...
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6794826 |
Apparatus and method for lamp ignition control
Intermittent electrical power is applied to a lamp ballast to achieve reliable ignition within specifications of the related hardware. The operating state of the lamp is sensed to facilitate...
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6794829 |
Method and apparatus for a protective ballast circuit
A plurality of lighting ballasts ( 12, 14, 16 ) draw power from a single DC bus signal. A power factor correction circuit ( 10 ) rectifies and smoothes AC power to produce the DC bus signal. In...
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6791280 |
System and method for generating a discharge in high pressure gases
A method of generating an electrical discharge in a high pressure gas contained in a sealed enclosure. The method includes driving a helical coil resonator at an RF frequency to generate an RF...
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6791285 |
Lamp color control for dimmed high intensity discharge lamps
A means of effecting color change or improved color rendition by altering the ratios of average lamp arc current to RMS lamp arc current in a high intensity discharge lamp typically a metal halide...
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6791279 |
Single-switch electronic dimming ballast
An electronic ballast for a fluorescent lamp has a single-switch flyback inverter including a magnetizing inductance, a resonant circuit connected to the output of the inverter including a tank...
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6791286 |
Hid lamp operating circuit
A lighting circuit for an HID lamp causing no erroneous operation of a lighting circuit even when counter-electromotive force is generated due to the inductance in the wirings when the lighting...
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6791273 |
Vehicle lighting fixture
A vehicle lighting device uses a high-beam discharge lamp and a low-beam discharge lamp, and includes a DC/DC converter circuit, DC/AC converter circuit, starter circuits, and a control circuit for...
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6788009 |
Method and device for lighting ultra-high pressure discharge lamps
There is provided an improved method of lighting an ultra-high pressure discharge lamp in which a pair of electrodes are disposed confronting each other with a spacing of not more than 1.5 mm...
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6784623 |
Variable switch with reduced noise interface
A direct-current dimmer switch with low noise. A direct-current switch is turned on relatively slowly to avoid noise generation. Input capacitance of the direct-current switch device works in...
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6784627 |
Discharge lamp lighting device to light a plurality of discharge lamps
A discharge lamp lighting device comprises a plurality of discharge lamps, at least one reflector, and at least one leakage transformer. Each leakage transformer lights three discharge lamps and...
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6781323 |
Electronic ballast with crest factor correction
Low cost electronic ballast does not have a function of crest factor correction in those conventional arts, and so a life span of a fluorescent lamp using the electronic ballast decreases due to a...
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6781327 |
Discharge lamp lighting device
In a discharge lamp lighting device having a power source, a HID bulb ( 5 ), and an igniter ( 4 ), the power source supplies DC or AC voltage to the HID bulb ( 5 ), the igniter ( 4 ) applies a high...
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6781328 |
Image display apparatus and method for operating the same and lamp unit for image display apparatus
An image display apparatus includes a lamp unit including a discharge lamp and a reflecting mirror, an optical system and a ballast circuit. The ballast circuit includes a power circuit portion, an...
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6781326 |
Ballast with lamp sensor and method therefor
A ballast circuit is provided having an input, an output for coupling to an electric discharge lamp and an oscillation circuit for illuminating the lamp. A circuit may be included for sensing when...
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6774579 |
Electric discharge lamp and electric discharge lamp drive apparatus
A lighting control signal generating circuit 10 controls the output pulse of a drive signal circuit 11 by the output signal. The output pulses of the drive signal circuit 11 include a first...
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6774580 |
Inverter circuit for a discharge tube
An inverter circuit for a discharge tube of the present invention comprises a transformer in which a resonance circuit is composed of a parasitic capacitance of a discharge tube, and a H-bridge...
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6768272 |
Apparatus for driving a fluorescent lamp
An apparatus for driving a fluorescent lamp. The apparatus includes a dynamic driving voltage generator and an inverter. The dynamic driving voltage generator outputs a dynamic driving voltage. The...
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6765354 |
Circuitry arrangement for the operation of a plurality of gas discharge lamps
A circuitry arrangement for operating n gas discharge lamps, n being a whole number greater than 1, includes a single inverter, fed with d.c. voltage, for generating an a.c. voltage alterable in...
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6765355 |
Apparatus for lighting a discharge lamp at electric characteristics appropriate to a type of the discharge lamp
Electric characteristics such as a change of an electric power, a change of a voltage and a change of a current supplied from a discharge lamp lighting apparatus to a discharge lamp from a lighting...
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6759813 |
Operating circuit for a discharge lamp with frequency-variable ignition
A novel operating circuit for a low-pressure gas discharge lamp 1 in the case of which a digital controller 12 is designed such that by gradually lowering the operating frequency in the...
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6759661 |
Miniature high intensity LED illumination source
An apparatus emits radiation on curable adhesives to bond things together under different ambient conditions. An insulating housing has a cylindrical section and a disc-shaped section defining an...
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6756744 |
Method of initiating lighting of a discharge lamp, circuit for lighting a discharge lamp, light source device using the circuit, and optical instrument incorporating the light source device
A method of initiating lighting of a discharge lamp is provided including applying to the discharge lamp to be lighted an initiating voltage resulting from superimposition of a step-up pulse...
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6753661 |
LED-based white-light backlighting for electronic displays
Apparatus and method for backlighting an electronic display with LEDs to control luminosity, radiometric power, and color levels by means of feedback control through a microprocessor, thereby...
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6753660 |
Method and arrangement with control gear, and control gear
A method and an arrangement in connection with a control gear arranged to control two parallel-connected fluorescent tubes, and a control gear, whereby the parallel-connected fluorescent tubes are...
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6750620 |
Discharge lamp igniter device and projector device
A discharge lamp lighting device for lighting a discharge lamp includes an ignitor for applying a starting voltage to the discharge lamp at the time of starting and thus lighting the discharge...
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6750842 |
Back-light control circuit of multi-lamps liquid crystal display
A multi-lamps LCD back-light control circuit comprises a control unit, an full bridge switch, a resonance network circuit, a voltage transformer, a lamp, and a feedback network. A constant...
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6750619 |
Electronic ballast with filament detection
A fluorescent lamp electronic ballast for use with fluorescent lamps of the preheat or heated filament type is provided. The electronic ballast includes a multiple output DC to DC converter with a...
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6747420 |
Drive circuit for light-emitting diodes
The invention relates to a control circuit for at least one light-emitting diode ( 1 ) for adjusting the current and/or the voltage of the light-emitting diode ( 1 ) to a desired value adjusted by...
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6747418 |
Device and method for preheating the coil electrodes of a fluorescent lamp
The present invention relates to a device for preheating the two coil electrodes (W 1 , W 2 ) of a fluorescent lamp (La) comprising an AC voltage source ( 10 ), a resonance capacitor C R , which is...
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