|
Match
|
Document |
Document Title |
|
|
8084953 |
Changing power input to a gas discharge lamp
The present disclosure thus provides a technique for providing multi-level operation of ballast circuitry for discharge lamps. In one version, an auxiliary capacitance is switched in and out of...
|
|
|
8013543 |
Backlight control circuit
An exemplary backlight control circuit includes a transformer, a control circuit, a lamp. The control circuit and the transformer form an inverter circuit to providing an alternating current (AC)...
|
|
|
7804253 |
Self-exciting step-up converter
An electronic ballast includes a step-up converter, which includes a storage inductor, a diode, an intermediate circuit condenser and a switch element. According to the invention, a current passing...
|
|
|
7512333 |
Method and apparatus for powering a strobe for retinal imaging
A lightweight, small, high-voltage power supply for a xenon flash lamp or strobe permits rapid and reliable strobing for retinal imaging. In one embodiment the power supply can develop 500 volts at...
|
|
|
7315130 |
Switching control for inverter startup and shutdown
An electronic ballast circuit for a lamp is described, wherein the ballast comprises a power factor correction circuit coupled to an inverter circuit. The inverter circuit is further coupled to a...
|
|
|
7245085 |
Lamp fault detector
The continuity of a series-wired, lamp circuit is restored after interruption caused by failure of a lamp filament by providing a control relay that is wired in parallel with each lamp. A power...
|
|
|
7235931 |
Discharge lamp lighting apparatus for lighting multiple discharge lamps
In a discharge lamp lighting apparatus to light two discharge lamps, one terminal of the secondary side of a step-up transformer is connected to one terminal of each of the two discharge lamps, the...
|
|
|
7190124 |
Two-wire dimmer with power supply and load protection circuit in the event of switch failure
A dimmer circuit provides AC power to an inductive lighting load in series with the dimmer circuit. A bidirectional semiconductor switch has a control electrode with a control signal for...
|
|
|
6894439 |
Portable power converter pack
A portable power converter comprising input means to receive low voltage DC input, voltage converter means for converting the low voltage DC input into high DC voltage output, the voltage converter...
|
|
|
6856101 |
Method and apparatus for switching of parallel capacitors in an HID bi-level dimming system using voltage suppression
Switching of parallel capacitors in an HID bi-level lighting control system is accomplished through use of transient voltage suppression across an electronic relay for discharge of residual charge...
|
|
|
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...
|
|
|
6590349 |
Bidirectional flip-flop
A bidirectional switch, including a first bidirectional switch between two power terminals of the switch, a low-voltage storage element between a first power terminal and a control terminal of the...
|
|
|
6518713 |
Method of illuminating incandescent lamp, and circuit for illuminating the same
An incandescent lamp 12 and a MOSFET 14 are connected in series with a power supply. A capacitor 164 is interposed between the gate G of the MOSFET 14 and a reference potential. Electric charges...
|
|
|
6448950 |
Energy efficient resonant switching electroluminescent display driver
A driving circuit for powering an electroluminescent display using energy recovered from a varying panel capacitance of the display. The driving circuit comprises a source of electrical energy; and...
|
|
|
6407507 |
Personal electronic device having EL lamp and buzzer powered from a single inductor
A personal electronic device includes and inverter having a single inductor for powering an EL lamp and a buzzer. The lamp and the buzzer are coupled together to the output of the inverter and are...
|
|
|
6396220 |
Lamp ignition with compensation for parasitic loading capacitance
A ballast for powering a gaseous discharge lamp that has a required minimum ignition voltage and a permissible maximum ignition voltage. Via a cable through which ignition voltage pulses are...
|
|
|
6356027 |
0-10V dimming interface protection circuit
A 0-10V dimming interface protection circuit generating an indication that line voltage is applied across first and second leads of the dimming interface controlling light output by a lamp,...
|
|
|
6225757 |
Combination MH/HPS ballast
A combination electronic ballast designed to operate a metal halide lamp and a high-pressure sodium gas discharge lamp is disclosed. The ballast includes a primary and secondary coil coupled to a...
|
|
|
6198232 |
Discharge lamp circuit with dual ignition coils
A ballast circuit for a compact fluorescent lamp includes a down-converter for operating the lamp with a DC current during stationary operation. The ballast circuit is equipped with an additional...
|
|
|
6191538 |
High-pressure discharge lamp having a base at one end and a starting device integrated in the base
The invention relates to a high-pressure discharge lamp having a base at one end and whose return conductor (13) is protected with the aid of a bidirectional trigger (D) against high induced...
|
|
|
6181082 |
Ballast power control circuit
A ballast circuit for energizing a lamp includes an inductive element coupled to an input terminal and a capacitive element coupled to the inductive element in parallel with the lamp. In one...
|
|
|
6151560 |
Open circuit failure monitoring apparatus for controlled electrical resistance heaters
An open circuit failure monitoring apparatus for controlled electrical resistance heaters is disclosed. The heater failure monitoring apparatus allows controlled electrical resistance heaters to be...
|
|
|
6114816 |
Lighting control system for discharge lamps
A lighting control system for discharge lamps which comprises a ballast for supplying energy from a power source to a lamp. First and second capacitors and a first control relay and contact set...
|
|
|
6104147 |
Pulse generator and discharge lamp lighting device using same
A pulse generator for a stable output pulse voltage obtains a high voltage pulse with a charge accumulated in a capacitor and discharged at a discharge gap made ON, wherein a pulse energy source...
|
|
|
6057650 |
Input circuit for the starter of a high-pressure gas-filled discharge lamp
A high-pressure gas discharge lamp is connected on one side to a lead across the secondary winding of a starter transformer and to a second lead on the second side. Starting energy is applied with...
|
|
|
6031340 |
Device and method for capacitive bi-level switching of high intensity discharge lighting
A zero current crossing capacitive switching scheme for controlling the switching of a capacitor into and out of an HID lead ballast circuit at a time when a current through the capacitor is at or...
|
|
|
5962988 |
Multi-voltage ballast and dimming circuits for a lamp drive voltage transformation and ballasting system
A discharge lamp operating circuit is connected to a source of alternating current (AC) voltage, and has a discharge lamp and a semi-resonant circuit connected to the source of alternating current...
|
|
|
5949196 |
Method and system for switchable light levels in operating gas discharge lamps with an inexpensive single ballast
An arrangement for switchably operating one or more gas discharge lamps, such a compact or circline fluorescent lamps, with a single ballast commonly used with a linear fluorescent lamp. One or...
|
|
|
5923127 |
High-pressure discharge lamp with miniature discharge vessel and integrated circuitry
A discharge vessel with a ceramic wall is filled with inert gas and metal and is ignited and operated by an electronic circuit including a half bridge converter with an LC circuit which, when the...
|
|
|
5894200 |
Two terminal method of and apparatus for improving electrical and light producing efficiency in low voltage direct current incandescent lamp intensity control
A method for improving electrical and light producing efficiency in two terminal, direct current, low voltage incandescent lamp dimming wherein a small inductance in series with the power source,...
|
|
|
5844374 |
Inverter arrangement employing resonant capacitive elements directly connected across the switching elements for zero voltage switching
A circuit arrangement for operating a high pressure discharge lamp having a full bridge commutator network. A capacitor across each of four commutator switches forms a tuned circuit together with a...
|
|
|
5838115 |
Gas discharge device
In a gas discharge device having a gas discharge channel, which comprises two gas discharge electrodes and a gas discharge volume lying between said electrodes, having an energy storage circuit...
|
|
|
5825139 |
Lamp driven voltage transformation and ballasting system
A discharge lamp operating circuit is connected to a source of alternating current (AC) voltage, and has a discharge lamp and a semi-resonant circuit connected to the source of alternating current...
|
|
|
5751116 |
Apparatus to retrofit an HID light fixture
An apparatus for retrofitting an HID light fixture is described in several embodiments. The apparatus is coupled in series with the secondary winding and the HID lamp of the HID light fixture. A...
|
|
|
5663612 |
Apparatus for dimming discharge lamp having electromagnetic regulator with selectively tapped capacitance winding
An apparatus for dimming a discharge lamp is provided which comprises an electromagnetic regulator. The electromagnetic regulator has a primary winding connected to an AC power supply, a secondary...
|
|
|
5640070 |
Electronic flash apparatus with a protective circuit which limits heating
In an electronic flash apparatus having a flash tube (2) which is disposed inside a reflector (3), having a storage capacitor (5) which can be discharged via the flash tube having a d.c. voltage...
|
|
|
5594305 |
Power supply for use with switched anode field emission display including energy recovery apparatus
A switching power supply 38 for use in a switched anode, field emission flat panel display includes energy recovery modules 48R, 48G and 48B for recovering energy from each anode electrode 50R, 50G...
|
|
|
5572093 |
Regulation of hot restrike pulse intensity and repetition
Included in a ballast circuit arrangement for a gas discharge lamp is a ballast transformer arrangement receptive of an input power signal and providing an output, ballast voltage. Further included...
|
|
|
5563473 |
Electronic ballast for operating lamps in parallel
An electronic ballast for powering at least two rapid start, parallel connected fluorescent lamps. Associated with each lamp is a serially connected choke and capacitor combination. A train of...
|
|
|
5519287 |
Two terminal pulsed low voltage incandescent lamp dimmer with increased illuminating efficiency
A two terminal pulse width modulated incandescent lamp dimmer using low frequency pulse repetition rate provides increased illuminating efficiency by compensating both for light producing...
|
|
|
5502357 |
Low cost inverter for EL lamp
An EL lamp is driven by a flyback inverter having an inductor connected in series with a first transistor which switches on and off at a high frequency. The junction of the inductor and transistor...
|
|
|
5498936 |
Power system with simplified, low cost self-starting self oscillator, power factor correction, power regulation and output open circuit voltage regulation, overload and short circuit protection
A gas discharge lamp power ballast or power supply having simplified power factor correction, simplified automatic short circuit/overload protection and output open circuit voltage regulation. The...
|
|
|
5463285 |
Variable capacitor with very fine resolution
The resolution ΔC of a binary capacitance ladder having a plurality of N branches is precisely determined by appropriately selecting the value of a fixed capacitor in each branch relative to the ...
|
|
|
5451843 |
Apparatus and method for providing bilevel illumination
A lighting fixture has a lamp and a housing for a lamp ballast. In the new fixture for providing bilevel illumination, the housing also contains a control device comprised of a dual capacitor and a...
|
|
|
5449980 |
Boosting of lamp-driving voltage during hot restrike
Disclosed is a ballast circuit arrangement for a gas discharge lamp, which includes a ballast transformer arrangement receptive of an input power signal, having a winding and a serially connected...
|
|
|
5442260 |
Light-emitting element drive circuit
A light-emitting element drive circuit for a camera comprises a diode and a light-emitting element connected in series with each other between a power source and ground, a first switching element...
|
|
|
5420479 |
High pressure vapor discharge lamp with a built-in igniter
A built-in igniter type high pressure sodium lamp includes an igniter connected in parallel with an arc tube 1 for a high pressure sodium lamp and composed of a series circuit of a...
|
|
|
5416384 |
Back-up lighting system
This is an emergency lighting system that provides an emergency driving voltage to drive at least one lamp when the AC power input to the lamp is detected as absent. A rechargeable battery pack and...
|
|
|
5396152 |
Electrical circuit for the pulsed operation of high-pressure gas-discharge lamps
The Lamp (La) is connected in series with first reactive impedances (C1, . To generate pulses, one or more second reactive impedances (C3, L3; C3-L2) are located as energy storage elements in...
|
|
|
5367227 |
Circuit arrangement for operating a gas-discharge lamp
A circuit arrangement for operating a gas-discharge lamp is proposed, in which the high voltage for starting the gas-discharge lamp is generated by means of the energy stored in a transformer or...
|