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| Number | Title | Issue Date |
| 7525255 | Split phase inverters for CCFL backlight system An apparatus and method for driving a lamp are provided. In one embodiment, an inverter having four switching elements is split into two inverter arms that are deployed at separate terminals of a floating lamp structure to achieve even light output. A controller dri... | 04/28/2009 |
| 7439682 | Current driving circuit for inductive loads A circuit for driving the current for inductive loads such as a electron beam deflection coil for an x-ray generator system. The circuit includes two selectable voltage levels which are provided by a high level voltage source and a low level voltage source or, alter... | 10/21/2008 |
| 7327092 | Current driving circuit for inductive loads A circuit for driving the current for inductive loads such as an electron beam deflection coil for an x-ray generator system. The circuit includes two selectable voltage levels provided by a high level and a low level source. A plurality of switches selects the volt... | 02/05/2008 |
| 7116053 | Method for arc attachment stabilization A method of stabilizing an arc between electrode tips in a high pressure arc discharge lamp is provided comprising initially creating an arc between the pair of electrodes during a start-up phase of the lamp by supplying power to the lamp for a first period. The met... | 10/03/2006 |
| 7102334 | Method and apparatus for electronic power control The method of the invention in one aspect involves electronic power control by varying the amplitude of an electrical power supply voltage, independent of frequency, whereby the output frequency will always be the same as the input frequency. An electrical circuit a... | 09/05/2006 |
| 7088357 | Power circuit for display driver, display device, and camera A power circuit supplies a plurality of voltages to a display-device-driving circuit for time-division-driving a display device. Each of the plurality of voltages are output via a constant-voltage circuit constituted by a regulator for dividing a voltage supplied fr... | 08/08/2006 |
| 7084587 | Apparatus and method for control of high intensity discharge lighting An improved apparatus and method for control of discharge lighting, such as HID (high intensity discharge) lighting, effects full-voltage start up of the lighting, and sustained operation of the lighting at a reduced voltage after a selected and variable start-up ph... | 08/01/2006 |
| 7084580 | Discharge lamp lighting circuit A discharge lamp lighting circuit 1 has: a DC-AC converter circuit 3 which receives a DC input, and which conducts AC conversion and a boosting operation; and a starting circuit 4 which supplies a starting signal to a discharge lamp 10. T... | 08/01/2006 |
| 7075246 | Discharge lamp illumination circuit A discharge lamp illumination circuit 1 has a DC-AC conversion circuit 3 which effects AC conversion and boosting upon receipt of a DC input, and a starter circuit 4 for supplying a start-up signal to a discharge lamp. Power output from the DC-A... | 07/11/2006 |
| 7043709 | Method and apparatus for determining gate-level delays in an integrated circuit A system is provided for determining voltage at the output of a gate in an integrated circuit. The system locates a gate within the integrated circuit and looks up a set of output current waveforms as a function of time for different effective capacitances at the ga... | 05/09/2006 |
| 6975314 | Power circuit for display driver, display device, and camera There is provided a power circuit for a display-device-driving circuit for supplying a plurality of voltages to a driving circuit for time-division-driving a display device, wherein each of the plurality of voltages are output via a constant-voltage circuit constitu... | 12/13/2005 |
| 6967446 | High pressure discharge lamp lighting apparatus and high pressure discharge lamp lighting method A high pressure discharge lamp lighting apparatus is provided which prevents dying out or instabilities of the discharge arc inside the arc tube due to the acoustic resonance phenomena and enables to light the high pressure discharge lamp in a steady state. In the h... | 11/22/2005 |
| 6934772 | Lowering display power consumption by dithering brightness A method for reducing video display power usage by dithering the brightness. This method can be used to reduce power consumption without having an effect on the brightness of the display screen as perceived by the user or may further reduce the power consumed with a... | 08/23/2005 |
| 6900446 | Charged particle beam irradiation equipment and control method thereof A power supply for applying a voltage to a scanning electromagnet for deflecting a charged particle beam has a first power supply unit having no filter and a second power supply unit having a filter. When an irradiation position of the charged particle beam in an ir... | 05/31/2005 |
| 6844687 | Method of operating a discharge lamp A method of operating a discharge lamp includes modulation of lamp power with a first longitudinal mode frequency to reduce segregation of the vapor phase species within the arc tube. The first longitudinal mode excitation frequency is determined by the acoustic res... | 01/18/2005 |
| 6670780 | Method for operating high-pressure discharge lamp, lighting apparatus, and high-pressure discharge lamp apparatus Disclosed is a method for operating a high-pressure discharge lamp, a lighting apparatus, and a high-pressure discharge lamp apparatus each capable of operating the lamp at a power lower than the rated power without imposing excessive burden on the lighti... | 12/30/2003 |
| 5932976 | Discharge lamp driving A discharge lamp driving circuit includes DC voltage input connections, lamp driving connections, bridge circuitry, and control circuitry. The bridge circuitry is connected to the DC voltage input connections and to the lamp driving connections and includ... | 08/03/1999 |
| 5723951 | Method of hot restarting a high intensity discharge lamp An apparatus and method for operating an arc discharge lamp which can be hot restarted is described. The method involves providing low microwave power after the lamp ballast is disconnected from the lamp. The microwave power is modulated such that conduct... | 03/03/1998 |
| 5714845 | Method and circuit arrangement for operating a high pressure gas discharge lamp A high pressure gas discharge lamp is operated with normal output by at least predominantly low frequency energy supplied from a conventional power supply unit, and is operated at lower than 25 percent of the normal output by at least predominantly high f... | 02/03/1998 |
| 5581160 | Method and apparatus for lighting an EL element An electroluminescence (EL) element lighting device for an EL element, includes a first circuit for self-oscillating to generate a first signal having a first frequency, and for gradually charging up said EL element in response to the first signal, and a ... | 12/03/1996 |
| 5578906 | Field emission device with transient current source A field emission device (100) having an electron emitter (101), for emitting electrons, an extraction electrode (102) proximally disposed with respect to the electron emitter (101), an anode (103) for collecting some of any emitted electrons is formed. An... | 11/26/1996 |
| 5402042 | Method and apparatus for vacuum fluorescent display power supply A power supply for a VF display generates a DC filament voltage from a battery by either a switched transformer supply or a monolithic regulator circuit. Where a higher-than-battery voltage is needed for anode and grid voltages, another monolithic regulat... | 03/28/1995 |
| 5349269 | Power supply having dual inverters for electroluminescent lamps A power supply for an electroluminescent lamp includes a pair of inverters for alternately powering the EL lamp from a low voltage DC source. A first inverter is connected to a first electrode of the EL lamp and a transistor is connected between the first... | 09/20/1994 |
| 5278475 | Cathodoluminescent display apparatus and method for realization using diamond crystallites Cathodoluminescent display apparatus employing an electron source including a plurality of diamond crystallites. Image display apparatus employing an array of picture elements, each picture element having associated therewith an electron source including ... | 01/11/1994 |
| 5214352 | Light dimming system for emergency operation An emergency lighting system utilizing standard nonemergency circuitry to provide power to all of the light fixtures in a facility during a power failure. This emergency lighting system uses an electronic inverter to convert d.c. power stored in batteries... | 05/25/1993 |
| 5144205 | Compact fluorescent lamp dimming system A dimming system provides power from a switch-controlled power source in series with a leakage auto-transformer to a compact fluorescent lamp. The system incorporates a high-frequency resonant converter that provides high voltages to strike and maintain a... | 09/01/1992 |
| 5095251 | Low voltage DC light apparatus for a neon lamp A lighting apparatus for a neon lamp includes a direct current power supply with a relatively low voltage output. The direct current power supply actuates a pulse oscillator to produce a narrow pulse voltage train output. The narrow pulse voltage train ou... | 03/10/1992 |
| 5034660 | Method of and apparatus for supplying high frequency alternating current to a fluorescence lamp A method of and apparatus for supplying high frequency alternating current to a fluorescence lamp. For eliminating a so-called striation phenomenon, a direct current component is induced in the high frequency alternating current passing through a lamp (8)... | 07/23/1991 |
| 5032782 | Series-connected power-line controller A full-bridge transistor inverter is connected at its DC supply-side with an energy-storing capacitor. The inverter's output terminals are connected in series between a source of AC voltage and a load; which load may be an electric motor, a fluorescent li... | 07/16/1991 |
| 5013974 | Electronic ballast with improved lamp current crest factor An inverter-type electronic fluorescent lamp ballast powers a fluorescent lamp with a sinusoidal current that is modified by insertion of a measured amount of properly phased third harmonic current, thereby attaining a lamp current crest factor that is su... | 05/07/1991 |
| 4972126 | Ballasting system for fluorescent lamps A ballasting system for powering an array of flourescent lamp assemblies, as in a sun tanning apparatus, comprises an electronic frequency converter adapted to convert ordinary 60 Hz power line voltage into two non-current-limited high frequency outputs: ... | 11/20/1990 |
| 4939423 | Reduction of effects of beat frequencies in systems with multiple oscillators Apparatus for reducing the effects of beat frequencies in systems having multiple oscillators wherein a wide band frequency modulator operates to alter the frequency supplied by one of the oscillators at a rate high enough that any beat frequencies occur ... | 07/03/1990 |
| 4910438 | Wide band, high efficiency simmer power supply for a laser flashlamp Methods and apparatus are disclosed for supplying and controlling simmer current to a flashlamp 28. A direct current-to-direct current converter including a transformer 12, full-wave bridge rectifier 24, and first and second switching means 20 and 22 prod... | 03/20/1990 |
| 4870326 | Method and apparatus for driving neon tube to form luminous bubbles and controlling the movement thereof A system for driving a neon tube to form luminous bubbles and controlling the motion thereof in which a modulatable high AC voltage source is connected to control a pair of electronic switches in the primary circuit of a high voltage transformer which is ... | 09/26/1989 |
| 4862042 | Apparatus and method for forming segmented luminosity in gas discharge tubes A device for producing and controlling the flow rate of bubble-like ionization discontinuities (30) in a gas discharge tube (10) which includes means to produce an alternating current at a frequency between 1500 and 8000 Hz and a voltage between 2000 and ... | 08/29/1989 |
| 4855646 | Fluorescent illuminator with inverter power supply A fluorescent illuminator including a fluorescent lamp, a lamp housing, and a lamp power supply with a variable current output with a relatively fixed frequency at least an order of magnitude greater than line frequency and a non-integral multiple thereof... | 08/08/1989 |
| 4818917 | Fluorescent lighting ballast with electronic assist A ballasting circuit for fluorescent lamps includes a series-connected current limiting ballast element and an electronic assist circuit. The ballast element has a high voltage side connectable to a commercial 110 VAC/60 hertz power source and a low volta... | 04/04/1989 |
| 4803406 | High-pressure discharge lamp operating circuit A high-pressure discharge lamp operating circuit performs a low-frequency AC operating at an early stage of operating and thereafter performs a high-frequency AC operation or DC operation during the steady-state of lamp operation. This circuit comprises a... | 02/07/1989 |
| 4798997 | Lighting device A discharge tube adapted to produce a light by an extraneous high frequency electromagnetic field is heated before discharge to thereby improve the rising-up of the discharge and achieve uniformization of emitted light. Further, the discharge tube is heat... | 01/17/1989 |
| 4797598 | Illumination apparatus An illumination apparatus includes a discharge tube for emitting light upon an application of an external high frequency wave electromagnetic field, an electrode, arranged outside the discharge tube, for applying the high frequency wave electromagnetic fi... | 01/10/1989 |
