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| Number | Title | Issue Date |
| 7312584 | Plasma-generation power-supply device A plasma-generation power-supply device includes a transformer connected to an alternating-current power-supply, a rectifier connected to the transformer, an inverter connected to the rectifier, a reactor inserted in series in a power line of an ozonizer that is sup... | 12/25/2007 |
| 7119495 | Controlling a light assembly A method and apparatus for operating a light assembly with fewer peripheral devices than is currently required is presented. The apparatus of the invention includes a lamp unit, a current restricting unit coupled to the lamp unit, and a current sensing unit that is ... | 10/10/2006 |
| 7049765 | Transformer for dimmer switch or on/off switch and method of use The present invention achieves the above objects, among others, by providing, in a preferred embodiment, a transformer system for use with either a dimmer switch or an on/off switch, including: a transformer; a load connected to the transformer; a first tap connecte... | 05/23/2006 |
| 6922883 | Method for making a non-linear inductor Non-linear inductor(s) are used to reduce the percent total harmonic distortion of the harmonics in the line currents in the input side rectifier system of an ac drive system. Several constructions for the non-linear inductor(s) are described. The non-linear inducto... | 08/02/2005 |
| 6914392 | Switching apparatus for operating discharge lamps The following circuit is proposed for discharge lamps having a particularly high starting voltage. An a.c. voltage generator (1) provides a corresponding a.c. voltage. A starting voltage generating device, which comprises a piezo transformer (2), is co... | 07/05/2005 |
| 6650067 | Electronic ballast for discharge lamps An electronic ballast operates a gaseous discharge lamp. The electronic ballast includes a filter circuit for removing noise from an electrical power signal. The power factor of the filtered power signal is adjusted by a power factor correction circuit. T... | 11/18/2003 |
| 6568774 | Pulsed operation method for a silent discharge lamp The invention improves an operating method, already described in the prior application 198 39 329.6, for a silent discharge lamp L, in which, using the forward transformer principle, a voltage pulse effecting a forward ignition is impressed from a primary... | 05/27/2003 |
| 6522088 | Lamp ignition with automatic compensation for parasitic capacitance Ballast circuitry is provided for powering a gaseous discharge lamp which has a range of possible parasitic loading capacitances associated with it. The circuitry includes a reactive source of ignition pulses which stores sufficient energy to charge the h... | 02/18/2003 |
| 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 obtained by way of loosely-coupled auxiliary windings on the ... | 04/03/2001 |
| 6166494 | Drive circuit arrangement for a gas discharge lamp A drive circuit arrangement for a gas discharge lamp includes a) a self resonating inverting for providing a drive voltage across a load impedance, the inverter having a pair of field effect transistors which operate in anti-phase, b) a tank circuit for c... | 12/26/2000 |
| 5726537 | Circuit for pulsed operation of a discharge lamp To provide for automatic switch-over between a power phase and a holding se in operation of a discharge lamp (EL), a choke or ballast coil (L), serially connected to the discharge lamp, is constructed to have, with respect to current flow therethrough, a... | 03/10/1998 |
| 5477113 | Apparatus for applying a variable voltage to an electric load An apparatus for applying a variable voltage to an electric load utilizes a transformer with several taps to provide different voltage levels for the load. The load is connected to alternate taps by a switching device, which is operated by a control devic... | 12/19/1995 |
| 5444334 | System for starting a high intensity discharge lamp A ballast circuit arrangement with hot restrike capabilities includes an input transformer having a primary winding receptive of line power and a secondary winding over which an output voltage is made available. A first capacitor coupled across the second... | 08/22/1995 |
| 5428264 | Electronic ballast with controlled operating voltage In a fluorescent lamp ballast, a high-frequency AC voltage is applied directly across a tuned L-C circuit. The fluorescent lamp is connected in parallel with the capacitor of the L-C circuit and a voltage-limiting means prevents the series-resonating L-C ... | 06/27/1995 |
| 5345150 | Regulating light intensity by means of magnetic core with multiple windings A device for regulating the intensity of light emitted by a lamp includes a core of magnetic material, a first electrical circuit having a primary inductor wrapped around at least a portion of the core of magnetic material, and a second electrical circuit... | 09/06/1994 |
| 5289083 | Resonant inverter circuitry for effecting fundamental or harmonic resonance mode starting of a gas discharge lamp The invention relates to an inverter powering a lamp that uses a switch to vary the resonance of the resonance circuit for starting and for operating.... | 02/22/1994 |
| 5239239 | Surrounding a portion of a lamp with light regulation apparatus A device for regulating the intensity of light emitted by a lamp includes a variable inductor configured to surround a portion of the lamp and electrical circuitry arranged to connect electrically the variable inductor to the lamp in a manner such that a ... | 08/24/1993 |
| 5162700 | Controllable ballast and operating system utilizing same This reactor ballast is used for controlling a lamp and comprises a core and winding connected in circuit with the lamp and inductively coupled to the core for developing a magnetic field in the core when the winding is traversed by electric current. The ... | 11/10/1992 |
| 5140228 | Apparatus for regulating the intensity of light emitted by a lamp A control circuit is disclosed that can be used to control the light intensity of a fluorescent lamp. A first embodiment of the control circuit includes one variable inductor and a plurality of fixed inductors. A switch is used to connect one of the induc... | 08/18/1992 |
| 5118994 | Method and circuit for improved HID lamp maintenance In one aspect of the present invention a capacitor is placed in series with the ballast and the lamp. The capacitor lowers the impedance during lamp starting and is shorted out when final arc conditions of the lamp are reached. Method and device for impro... | 06/02/1992 |
| 5118997 | Dual feedback control for a high-efficiency class-d power amplifier circuit A dual feedback control system for a Class-D power circuit maximizes efficiency by controlling the magnitude and phase angle of the resonant load circuit using two separate feedback loops. The first feedback loop changes the value of a first variable capa... | 06/02/1992 |
| 5063332 | Feedback control system for a high-efficiency class-D power amplifier circuit A closed-loop control system for a Class-D power amplifier circuit, having a variable output resonant circuit impedance, maintains high-efficiency operation by using the phase angle between the resonant load voltage and current to control tuning of the re... | 11/05/1991 |
| 5015922 | Power supply circuit for a gas discharge lamp A power supply circuit for an electric discharge lamp driven by an A.C. power supply has a regulating transformer connected in parallel with a current limiting reactor and an electric discharge lamp interconnected in series. The tap of the regulating tran... | 05/14/1991 |
| 5004959 | Fluorescent lamp ballast with adjustable lamp current A fluorescent lamp ballast comprises a self-oscillating inverter with saturable transformer means in its positive feedback circuit. The saturation flux density of the magnetic material used in this saturable transformer means determines the frequency of i... | 04/02/1991 |
| 4980612 | Energy-saving ballast for electric gas discharge lamps In a ballast for operating one of a high-pressure sodium-vapor and a mercury-vapor lamp from a source of electric power, the ballast has a first one of a condenser and an inductor connected to be in series between the lamp and the source of electric power... | 12/25/1990 |
| 4851739 | Controlled-frequency series-resonant ballast In a self-oscillating inverter-type fluorescent lamp ballast, the inverter's output is a squarewave voltage of frequency controllable about 30 kHz. The squarewave voltage is applied across a series-connected high-Q L-C circuit. The fluorescent lamp is con... | 07/25/1989 |
| 4743809 | Xenon lamp circuit A circuit for a Xenon lamp is disclosed comprising an inductor having first, second and third connectors between one terminal of the lamp and a power line, said first connector being connected to said power line, means connecting the third connector to a ... | 05/10/1988 |
| 4622496 | Energy efficient reactance ballast with electronic start circuit for the operation of fluorescent lamps of various wattages at standard levels of light output as well as at increased levels of light output A ballast and control circuit for use with fluorescent lights. The circuit aids energy efficiency by removing heater current flow once the lamp has ignited. The circuit also uses time delayed inductive storage to allow delivery to the lamps of increased o... | 11/11/1986 |
| 4574223 | Fast warmup ballast for HID lamps A lag ballast for a high intensity discharge lamp includes a transformer providing voltage at either of two levels. Triacs tied to the transformer supply current at the desired voltage level through either of two inductances. The triacs are controlled by ... | 03/04/1986 |
| 4562384 | Variable reactance inductor with adjustable ranges A discharge lamp ballast for stabilizing wattage input into a discharge lamp at different levels in two or more ranges comprises a magnetic core forming a closed magnetic circuit. A main winding on the core may be used alone or with an extended winding sw... | 12/31/1985 |
| 4523129 | Modular lighting control with circulating inductor The invention is directed to a circuit and a method for efficiently controlling the output illumination level in gas discharge lighting arrangements. Load side control is provided by a timed interval controlled impedance, serially coupled between the ball... | 06/11/1985 |
| 4523130 | Four lamp modular lighting control The invention is directed to a circuit and a method for efficiently controlling the output illumination level of a gas discharge lighting arrangement having four or more gas discharge lamps with multiple ballasts. Load side control of each ballast is prov... | 06/11/1985 |
| 4464610 | Modular lighting control with circulating inductor The invention is directed to a circuit and a method for efficiently controlling the output illumination level in gas discharge lighting arrangements. Load side control is provided by a timed interval controlled impedance, serially coupled between the ball... | 08/07/1984 |
| 4463287 | Four lamp modular lighting control The invention is directed to a circuit and a method for efficiently controlling the output illumination level of a gas discharge lighting arrangement having four or more gas discharge lamps with multiple ballasts. Load side control of each ballast is prov... | 07/31/1984 |
| 4455510 | High intensity discharge ballast with hot restrike performance A high intensity discharge ballast that provides instant restrike of hot high intensity lamps, rapid warm-up and normal ballasting functions so as to circumvent the deficiencies of heating and cooling cycles in high intensity discharge lamps which cycles ... | 06/19/1984 |
| 4443740 | Dimmer switch for a fluorescent lamp A dimmer switch for a fluorescent lamp having a gaseous discharge light bulb, the switch being adapted to be connected in a ballast circuit including the light bulb and comprising a tapped inductor having a plurality of coil segments connected in series w... | 04/17/1984 |
| 4392089 | Isolator for use with frequency responsive switching circuit A frequency responsive power control system includes an improved isolator in series electrical connection with respect to a ballasted lamp load. The isolator has a high inductive impedance at low current for blocking ballast induced noise signals from int... | 07/05/1983 |
| 4350934 | Discharge device ballast component which provides both voltage transformation and variable inductive reactance Composite structure for use as an HID device ballast component and which performs the dual functions of voltage transformation and provision of ballasting reactance which can be cntrollably shifted in value. A multi-leg magnetic structure has a primary wi... | 09/21/1982 |
| 4349768 | Method for starting and operating a preheat type fluorescent lamp A method for starting and operating a preheat type fluorescent lamp includes a source of alternating current, a fluorescent lamp having a low impedance starting mode wherein current passes through one or more starting filaments and a high impedance operat... | 09/14/1982 |
| 4242614 | Lighting control system System for controlling operation of a plurality of gaseous discharge lamps for selectively turning on or off one or more of the lamps and producing desired lumen output of the lamps as needed, to provide for conservation of electrical energy. In the syste... | 12/30/1980 |
