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| Number | Title | Issue Date |
| 8188682 | High current fast rise and fall time LED driver The present invention contemplates a variety of improved techniques for the fast switching of current through, among others, LED loads. A current shunting device is utilized to divert current away from a load at high speed when activated, thus enabling the control o... | 05/29/2012 |
| 8004212 | Drive apparatus for a vacuum fluorescent display A VFD drive apparatus in which the filament of a VFD is coupled at a first terminal to an input voltage derived from a voltage source, and at a second terminal to a shunt voltage regulator that establishes a regulated filament current and a regulated cutoff voltage ... | 08/23/2011 |
| 7884557 | Protection circuit and method A light source is protected by selectively coupling a shunt path in parallel with the light source, such that current is diverted away from the light source and through the shunt path. A detection circuit detects the current flowing in the shunt path when the shunt ... | 02/08/2011 |
| 7388337 | Fluorescent lamp lighting apparatus and lighting control system A fluorescent lamp lighting apparatus according to the present invention comprises an initial illuminance correction control circuit which sets a fluorescent lamp to an initial illuminance correction control lighting mode, a switching portion which changes the fluor... | 06/17/2008 |
| 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 |
| 7302982 | Label applicator and system A label applicator including a support surface having a central area and curving downwardly from the central area. A post assembly extends up from the central area such that a label having a label through-hole can be positioned in a support position generally on the... | 12/04/2007 |
| 7279854 | Charge pump interface circuit A ballast circuit including a charge pump interface circuit is disclosed to provide a method of isolating a switch from a power line used to power a ballast for supplying electrical power to a lamp. In addition, the charge pump interface circuit provides a method to... | 10/09/2007 |
| 7259524 | Apparatus and methods for regulating delivery of electrical energy Apparatus and methods for regulating delivery of electrical energy to a lighting load are disclosed. An electrical waveform is received from a source of electrical energy. An integration value is generated based on a square of an amplitude of the received waveform. ... | 08/21/2007 |
| 7242012 | Lithography device for semiconductor circuit pattern generator General purpose methods for the fabrication of integrated circuits from flexible membranes formed of very thin low stress dielectric materials, such as silicon dioxide or silicon nitride, and semiconductor layers. Semiconductor devices are formed in a semiconductor ... | 07/10/2007 |
| 7211965 | High intensity discharge lamp with current sense resistor A circuit for operating a high intensity discharge (HID) lamp includes an H-bridge connected between a common terminal and a power line, and a control circuit connected to the H-bridge. The control circuit includes a transformer having a primary winding connected be... | 05/01/2007 |
| 7193239 | Three dimensional structure integrated circuit A Three-Dimensional Structure (3DS) Memory allows for physical separation of the memory circuits and the control logic circuit onto different layers such that each layer may be separately optimized. One control logic circuit suffices for several memory circuits, red... | 03/20/2007 |
| 7185230 | Method for monitoring a driver output A method for monitoring a driver output has is provision for actively influencing the driver output in order to perform fault analysis. To avoid a component addressed by the driver being influenced as a result of the active influencing of the driver output although ... | 02/27/2007 |
| 7176545 | Apparatus and methods for maskless pattern generation General purpose methods for the fabrication of integrated circuits from flexible membranes formed of very thin low stress dielectric materials, such as silicon dioxide or silicon nitride, and semiconductor layers. Semiconductor devices are formed in a semiconductor ... | 02/13/2007 |
| 7138295 | Method of information processing using three dimensional integrated circuits A Three-Dimensional Structure (3DS) Memory allows for physical separation of the memory circuits and the control logic circuit onto different layers such that each layer may be separately optimized. One control logic circuit suffices for several memory circuits, red... | 11/21/2006 |
| 7026799 | Circuit assembly for operating a luminous signal The invention relates to a circuit assembly for operating a luminous signal, particularly an LED signal, comprising at least one light-emitting diode (D) to which a resistance (R) is serially connected and a control (St) is connected in parallel. In order to adjust ... | 04/11/2006 |
| 6911789 | Power supply for a hot-filament cathode In accordance with one embodiment of the present invention, there is provided a switch-mode power supply to generate the heating current for a hot-filament electron-emitting cathode. The power supply directly couples, without an output transformer, the output from a... | 06/28/2005 |
| 6815911 | Filament lamp light source unit and filament lamp light quantity control method The invention relates to a light source unit control method and a light source control unit, and a light source unit comprising a filament lamp with a characteristic of having a light quantity changing almost in proportion to a control voltage, which includes: a cur... | 11/09/2004 |
| 6795044 | Plasma display panel and driving method thereof Scanning electrodes are shared between adjacent display lines. Sustaining electrodes are disposed between the scanning electrodes by two. The sustaining electrodes form display lines by gaps with adjacent scanning electrodes. The sustaining electrodes are separated ... | 09/21/2004 |
| 6721152 | Boost circuit and power supply converter The invention provides a boost circuit including a first capacitor, a transformer, a sensing resistor and a second capacitor. The transformer has a boost side coil with its one end connected in series with the first capacitor. The sensing resistor is connected in se... | 04/13/2004 |
| 6710993 | Method and apparatus for providing overload protection for a circuit A method and apparatus for voltage/current overage condition protection for a lighting control circuit. The method provides a hybrid software and hardware solution to take advantage of the useful attributes of both. Overages are sensed in hardware by digital compara... | 03/23/2004 |
| 6278420 | Plasma display panel and driving method thereof A plasma display panel, one of flat panel display device, having improved electrical connections and the driving method thereof are disclosed. The plasma display panel and the driving method thereof have the advantage of diminishing the number of the high... | 08/21/2001 |
| 6153980 | LED array having an active shunt arrangement A device, e.g., a luminaire, that includes a plurality of LEDs connected in series, and an active shunt arrangement for sensing a failure of one or more of the LEDs and for shunting current that would have otherwise flowed through a failed LED, to thereby... | 11/28/2000 |
| 5959413 | Home and small business phone system for operation on a single internal twisted pair line and methodology for operating the same A low power, low noise driving circuit for a bank of LEDs utilized in the station units of the MAN system is provided by coupling each bank of LEDs in a series circuit between the voltage supply and a constant current source. Each LED has a controllable l... | 09/28/1999 |
| 5844378 | High side driver technique for miniature cold cathode fluorescent lamp system A circuit for supplying power to a fluorescent lamp comprising a buck regulator with a high side drive. A dc battery is coupled to a drain of a first transistor. A source of the first transistor is coupled to an inverter for powering the lamp. A first con... | 12/01/1998 |
| 5767630 | Methods and apparatus for obtaining floating output drive to fluorescent lamps and minimizing installation requirements Power supply and control circuits are provided for driving a fluorescent lamp with a differential drive voltage from a low voltage DC power source. In one embodiment, the lamp is driven by a transformer having a primary and two independent secondary windi... | 06/16/1998 |
| 5604411 | Electronic ballast having a triac dimming filter with preconditioner offset control A dimming ballast for use with a phase control dimmer, and particularly a triac dimmer, includes an EMI filter selected with a high impedance to avoid excessive voltage and peak currents in the filter due to resonance with the phase controlled AC waveform... | 02/18/1997 |
| 5530319 | Power supply circuit for a discharge lamp and use of and method of operating the same For triggering a discharge lamp powered by a d.c. source and having electrodes disposed in the lamp bulb, a power supply circuit is proposed having a triggering device where, after the start of heating of a cathode (which cathode is in the form of a heate... | 06/25/1996 |
| 5517087 | Fluorescent lamp ignition circuit A fluorescent lamp ignition circuit of the type including a DC voltage stabilizer to process input voltage into a constant voltage by dropping or boosting, an inductance filter to receive output power supply from the DC voltage stabilizer and to remove su... | 05/14/1996 |
| 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 |
| 4973884 | Substitute lamp module for projectors A low light level lamp module for slide projectors is provided as a substitute for the normal lamp module using high-wattage, high-brightness lamps to permit using the projector with a conversion kit which allows the slides to be viewed on a video receive... | 11/27/1990 |
| 4912375 | Energizing arrangement for a discharge lamp A discharge lamp energizing arrangement comprises a starter and a generator adapted to maintain a discharge current in the lamp. The generator includes a first circuit arranged to couple in series a D.C. voltage source, a first switch and a second switch.... | 03/27/1990 |
| 4890039 | Fluorescent lamp resonant ballast Subject invention relates to a fluorescent lamp ballast that is intended for safe and cost-effective use in lighting systems wherein the power to the various lighting fixtures is provided from a central source of relatively high frequency (Ex: 30 kHz) AC ... | 12/26/1989 |
| 4792730 | Circuit for interrupting arc discharge in a gas-discharge vessel The device consists of a series network of a rectifier and a choke connected in parallel with a gas-discharge vessel and a capacitor. Between an intermediate tap of the primary of the saturating transformer and the positive terminal of the recitifer a thy... | 12/20/1988 |
| 4733137 | Ion nitriding power supply In the ion nitriding power supply disclosed herein, power to the discharge chamber is normally current-regulated by a pulse-width modulated current switching device effectively in series with a switching inverter which energizes the chamber, instantaneous... | 03/22/1988 |
| 4725759 | Pilot lamp A conventional pilot lamp which is used in a power plant, substation, or other types of plants, each has its own large and heavy weight transformer below the lamp case. In order to obtain a pilot lamp having the same capacity as the conventional pilot lam... | 02/16/1988 |
| 4724360 | Circuit arrangement for operating a high-pressure discharge lamp A circuit for operating a discharge lamp (1) by means of a direct voltage. The circuit comprises direct voltage terminals (A,B) for connection of a direct voltage source, alternating voltage output terminals (K,L) for connection to the discharge lamp, a d... | 02/09/1988 |
| 4723098 | Electronic ballast circuit for fluorescent lamps An electronic ballast circuit for fluorescent or other gaseous discharge lamps includes a resonant half-bridge inverter circuit. The source voltage to the inverter is a full-wave rectified line voltage together with a DC carry-over voltage for supplying p... | 02/02/1988 |
| 4654562 | Flashing lamp unit A flashing lamp unit comprising a fluorescent lamp, an ionization electrode in close proximity to the lamp, and an electrical means for exciting the lamp and ionization electrode to cause the lamp to flash. In one embodiment, the lamp is torroidal in shap... | 03/31/1987 |
| 4649322 | Energizing arrangement for controlling the luminous intensity of at least one discharge lamp and use of such arrangement The arrangement of the invention enables control of a light emitting element comprising at least one discharge tube. Firing of the tube is effected by a generator which provides voltage pulses at predetermined periodic intervals (Tr). The lumin... | 03/10/1987 |
| 4603281 | Electronic fluorescent lamp starter A Varistor (which is a non-linear impedance means) is connected in series with the primary winding of a current-transformer; and this series-combination is connected across the fluorescent lamp to be started. Before the lamp starts, the voltage across it ... | 07/29/1986 |
