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| Number | Title | Issue Date |
| 8154213 | Circuit arrangement and method for operating a high-pressure discharge lamp A circuit arrangement (10) for operation of a high-pressure discharge lamp having a commutation device (K), which has an input (E1, E2) for coupling to a DC voltage source and has an output (A1, A2) for coupling to the high-pressur... | 04/10/2012 |
| 7884555 | Discharge lamp ballast apparatus A capacitor 42 (C1) of a first bootstrap circuit 4 for maintaining the ON state of a first switching device 61, one of the two switching devices disposed on a higher potential side of first DC voltage V1, is not only charged with s... | 02/08/2011 |
| 7355300 | Solid state turbine engine ignition exciter having elevated temperature operational capability A turbine engine ignition exciter circuit applies energy stored in the exciter tank capacitor to the load (igniter plug) through a thyristor type semiconductor switching device that minimizes leakage current at elevated operating temperatures. The semiconductor swit... | 04/08/2008 |
| 7339326 | DC/AC converter for supplying two gas discharge lamps An DC/AC converter for supplying two gas discharge lamps, includes a double bridge configuration of four switches and a controller. The controller controls the conducting periods of the switches with a duty cycle which is variable. By control of the conducting perio... | 03/04/2008 |
| 7312427 | High-frequency dielectric heating device and printed board with thermistor A high-frequency dielectric heating device includes: a microwave output unit including an inverter unit using a semiconductor switching element, heat-radiating fins for radiating the heat generated by an IGBT, and a printed board having a thermistor for detecting th... | 12/25/2007 |
| 7259507 | Low pressure discharge lamp having external electrodes provided with heat equalizing members A dielectric barrier discharge type low pressure discharge lamp 11 includes dielectric barrier discharge type external electrodes 21, 22 on external ends of a tubular glass lamp vessel 10, electrically conductive material layers 31, 32 on... | 08/21/2007 |
| 7151680 | Switching power supply circuit and frequency converter An object of the present invention is to lower the voltage applied to the starting resistor of the starting circuit in a switching power supply circuit to reduce the power loss especially when the receiving voltage is high and thereby provide a small and inexpensive... | 12/19/2006 |
| 7132918 | Inductive coil assembly An inductive coil assembly having multiple coils arranged at distinct orientations to provide efficient inductive coupling of power or communications or both to a device when the device is arranged at different orientations with respect to the inductive primary coil... | 11/07/2006 |
| 7126286 | Lamp assembly, back light assembly having the same, display device having the same, and method of driving lamps A lamp assembly includes a lamp and a lamp driving device. The lamp includes a body and first and second electrodes. The body converts invisible ray generated by a discharge into visible ray, and the electrodes are disposed on the body. The lamp driving device provi... | 10/24/2006 |
| 7109669 | Microwave lamp power supply that can withstand failure in high voltage circuit A radiation generating system for treating a coating on a substrate. A high voltage circuit provides power to a microwave generator that, in turn, supplies microwave radiation to drive a lamp. A current limiting device is connected between the high voltage circuit a... | 09/19/2006 |
| 7102110 | Magnetron oscillating apparatus A magnetron oscillating apparatus includes a magnetron, power supply unit, and switch circuit. The magnetron oscillates a microwave. The power supply unit applies a power to the magnetron. The switch circuit is connected between the power supply unit and the cathode... | 09/05/2006 |
| 7091632 | Stabilization circuit for compensating fluctuations in a voltage at a user A stabilization circuit wherein voltages of the secondary winding of a transformer are stabilized with respect to mains voltage fluctuations and load fluctuations, an auxiliary voltage is derived either from a secondary winding of the transformer or an auxiliary tra... | 08/15/2006 |
| 7081636 | Pulsed UV light source There is described an ultraviolet light source comprising an ultraviolet bulb, a pulsed microwave energy source for exciting said ultraviolet bulb and an enclosure for enclosing the ultraviolet lamp, the enclosure comprising an optically transparent waveguide. The o... | 07/25/2006 |
| 7049764 | Electrodeless lighting apparatus using microwave and method for controlling power thereof An electrodeless lighting apparatus using microwave and a method for controlling its power can lengthen lifetimes of the magnetron by constantly maintaining power applied to a magnetron of the electrodeless lighting apparatus using microwave. Therefore, when inputte... | 05/23/2006 |
| 7018070 | Fluorescent lampholder with disconnectable plug on back A flourescent lamp assembly including a reflector having a cutout, a flourescent lamp and a lampholder. The lampholder includes a base end positioned within the cutout, a socket receiving the flourescent lamp and a first plug-in connector of a first gender for recei... | 03/28/2006 |
| 6963267 | Operator for a movable barrier and method of use A modifiable transmitter is used with an operator to control a position of a barrier. The operator includes a controller for comparing radio frequency transmissions received with stored serial numbers so that the controller can move the barrier when a radio frequenc... | 11/08/2005 |
| 6914391 | Illuminating device An illuminating device according to an embodiment of the present invention includes a dielectric barrier discharge type low pressure discharge lamp 1 composed of a tubular glass lamp vessel 10, in which mercury and rare gas are enclosed, a first and a ... | 07/05/2005 |
| 6870324 | Method for color mixing with arc stability and straightening of HID lamps operated at high frequencies using duty cycle modulation A method of color mixing with arc stability and arc straightening of HID lamps operated at high frequencies which modulates a duty cycle of a half bridge configured resonant inverter at a frequency which is substantially one-half the frequency of a second longitudin... | 03/22/2005 |
| 6856095 | High frequency heating device This invention provides a magnetron high frequency device which includes: a filtering inductor coupled to a positive end of a direct current power supply; a central tap transformer having a central tap end, a first end and a second end; a filtering capacitor; a firs... | 02/15/2005 |
| 6803731 | Operating circuit for a discharge lamp with early EOL detection The invention relates to a novel operating circuit for a low-pressure discharge lamp 1 with early EOL detection via a measurement of the DC voltage between the electrodes 2, 3. In this case, the DC voltage can be modified by an offset voltage 10 | 10/12/2004 |
| RE38547 | Frequency-modulated converter with a series-parallel resonance A frequency-modulated converter with a series-parallel resonance, particularly for driving any ohmic or inductive load, including gas discharge tubes, wherein a commutating voltage switch in the form of a transistor is provided and is connected in series between a n... | 07/06/2004 |
| 6617807 | Discharge lamp lighting circuit for a plurality of discharge lamps In a discharge-lamp lighting circuit for turning on a plurality of discharge lamps, starting circuits 8 for supplying starting pulses to the respective discharge lamps are provided. Each starting circuit 8 has transformers T1 and T2 equal in number to the... | 09/09/2003 |
| 6329757 | High frequency transistor oscillator system In a high frequency oscillator system a series oscillator circuit includes a load coil inductively coupled with a plasma generator. A capacitance is in series with the coil between the drain and source terminals of a transistor. A capacitive or inductive ... | 12/11/2001 |
| 6150768 | Ballast with active power factor correction An electronic ballast is powered from a constant-magnitude DC supply voltage and provides a high-magnitude high-frequency voltage at a ballast output across which are connected two lamp-ballast series-combinations, each consisting of an instant-start fluo... | 11/21/2000 |
| 6147459 | Voltage-controlled ballast for gas-discharge lamps An electronic, externally controlled ballast has a control oscillator which feeds a fluorescent lamp via an invertor bridge and a resonant circuit. To keep the voltage constant, there are derived from the lamp AC voltage charge packets whose size (and/or ... | 11/14/2000 |
| 5925989 | Buck converter switching scheme A circuit arrangement for igniting and operating a high-pressure discharge lamp is provided with a switching device, inductive device and a rectifier which together form a Buck converter, connected to input terminals for connection to a supply source and ... | 07/20/1999 |
| 5841241 | Electronic ballast for fluorescent lamps An electronic ballasting circuit provides high efficiency ballasting for most common types of fluorescent lamps. The circuit consists of a half-bridge inverter providing a substantially squarewave voltage across a series-combination of an inductor and a c... | 11/24/1998 |
| 5561349 | Frequency-modulated converter with a series-parallel resonance A frequency-modulated converter with a series-parallel resonance, particularly for driving any ohmic or inductive load, including gas discharge tubes, wherein a commutating voltage switch in the form of a transistor is provided and is connected in series ... | 10/01/1996 |
| 5510680 | Electronic ballast with special voltage waveforms An inverter-type electronic ballast for a gas discharge lamp is powered by a DC supply voltage provided from a rectifier-filter combination connected with an ordinary electric utility power line. The absolute magnitude of the DC supply voltage is higher t... | 04/23/1996 |
| 5510681 | Operating circuit for gas discharge lamps A half-bridge inverter is powered from a constant-magnitude DC supply voltage and provides at the inverter's output a first AC output voltage that is describable as a modified squarewave voltage. This first AC voltage is applied across a series-combinatio... | 04/23/1996 |
| 5449981 | Electronic ballast and power controller A relatively high efficiency, relatively light weight, relatively small electronic ballast or AC power controller for use in aircraft and elsewhere for controlling a fluorescent lamp load or other load includes an EMI filter, a multi-purpose transformer, ... | 09/12/1995 |
| 5422546 | Dimmable parallel-resonant electric ballast A pre-converter is connected with AC power line voltage and provides DC voltage across a pair of DC terminals. A current-limiting inductor, a self-oscillating parallel-resonant inverter, and a periodically activated FET switch are series-connected with on... | 06/06/1995 |
| 5386181 | Swept frequency switching excitation supply for gas discharge tubes The present invention describes a method and apparatus for a swept frequency switching gas discharge tube supply which produces a "crawling effect" in gas discharge tubes containing neon, argon or mercury gases or other gases and which has a means for eli... | 01/31/1995 |
| 5309350 | Push-pull inverter Here is disclosed a push-pull inverter used to drive a cold cathode discharge tube, a hot cathode discharge tube and the like, comprising a boosting transformer having a first primary coil, a first secondary coil, a second primary coil and a second second... | 05/03/1994 |
| 5262700 | Fluorescent lighting means A special fluorescent lamp is provided with its own built-in cathode heating means and is operable to be properly ballasted by way of a light-weight two-wire power cord coming from a special power plug that comprises a built-in high-frequency ballasting m... | 11/16/1993 |
| 5231333 | Switching excitation supply for gas discharge tubes having means for eliminating the bubble effect The present invention describes a method and apparatus for a high frequency switching gas discharge tube supply which suppresses or eliminates the "bubble effect" in gas discharge tubes containing neon or argon-mercury gas or other gases and which elimina... | 07/27/1993 |
| 5225741 | Electronic ballast and power controller A relatively high efficiency, relatively light weight, relatively small electronic ballast or AC power controller for use in aircraft and elsewhere for controlling a fluorescent lamp load or other load includes an EMI filter, a multi-purpose transformer, ... | 07/06/1993 |
| 5162703 | Flashing light warning apparatus A flashing light warning apparatus, which includes a voltage source (U), a main gate transformer (HW), a flash tube (R), an ignition device (Z), at least one storage condenser (K), and an electrical switching device (S), can be switched to provide light e... | 11/10/1992 |
| 5134344 | Ballast circuits for gas discharge lamps A ballast circuit includes a load circuit. A reservoir capacitor is effective to supply charge to the load circuit. A capacitive charge pump circuit is effective to transfer charge from a charge pump capacitive circuit to the load circuit and to the reser... | 07/28/1992 |
| 5130609 | Illuminating device incorporating gas-filled chambers A light source having two potential terminals, a transformer coil having a primary incorporating two windings and a secondary transistor, the first potential terminal being connected to the first winding of the primary, which is connected to the base of t... | 07/14/1992 |
