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| Number | Title | Issue Date |
| 8139378 | LED dimmer device adapted for use in dimmer A LED dimmer device for use in dimmer is provided. The LED dimmer device includes rectifier, voltage boost device, pre-voltage detection circuit and after-voltage detection circuit adapted for detect voltage, master chip adapted for driving circuit and elements to w... | 03/20/2012 |
| 8040694 | Spike converter The present invention is a spike converter providing a special mode of operation of a low power fly-back converter in a very narrow duty cycle range in particular. This spike operation minimizes the size of the required reactive components such as that of the power ... | 10/18/2011 |
| 7903432 | High-voltage power generation system and package A power generation system comprises a power source, a transformer module for converting a low voltage from the power source into a higher voltage, and a voltage-multiplier module for amplifying higher voltage from the transformer module. The transformer module compr... | 03/08/2011 |
| 7778045 | Universal power conversion methods Methods and systems for transforming electric power between two or more portals. Any or all portals can be DC, single phase AC, or multi-phase AC. Conversion is accomplished by a plurality of bi-directional conducting and blocking semiconductor switches which altern... | 08/17/2010 |
| 7599196 | Universal power converter Methods and systems for transforming electric power between two or more portals. Any or all portals can be DC, single phase AC, or multi-phase AC. Conversion is accomplished by a plurality of bi-directional conducting and blocking semiconductor switches which altern... | 10/06/2009 |
| 7390427 | Hydrofluoroether as a heat-transfer fluid The present invention provides an apparatus comprising a device and a mechanism for heat transfer comprising a hydrofluoroether heat-transfer fluid wherein the heat transfer fluid is represented by the following structure: Rf—O—Rh... | 06/24/2008 |
| 7362191 | Methods and circuits for frequency modulation that reduce the spectral noise of switching regulators The present invention comprises methods and circuits for spread spectrum frequency modulation that reduce peak spectral noise at the outputs or inputs of switching regulators. More specifically, the present invention modulates the operating frequency of the switchin... | 04/22/2008 |
| 7247954 | Portable AC power system A portable ac power system for providing cordless remote electrical power. The portable ac power system includes a pair of portable power supply devices, and a recharging assembly. The pair of portable power supply devices each including a portable housing, an outle... | 07/24/2007 |
| 7199552 | Control circuit apparatus and power supply circuit control method A microcomputer outputs a command to a control IC to operate first and second loads. The control IC sets first and second DC/DC converters' on-state to operate the first and second loads. The first DC/DC converter converts a voltage of power supplied from a power su... | 04/03/2007 |
| 7193337 | System and method utilizing a solid state power controller (SSPC) for controlling an electrical load of a variable frequency three-phase power source A solid state power controller (SSPC) (100) includes a power switching controller (30) and power switching devices (PSDs) (20A, 20B, 20C) for controlling each phase of a multiple-phase load to switch-on or -off at a zero-crossing p... | 03/20/2007 |
| 7128133 | Hydrofluoroether as a heat-transfer fluid The present invention provides an apparatus comprising a device and a mechanism for heat transfer comprising a hydrofluoroether heat-transfer fluid wherein the heat transfer fluid is represented by the following structure: Rf—O—Rh... | 10/31/2006 |
| 7034414 | Mobile AC-to-DC power conversion system A mobile AC-to-DC power conversion system that can convert AC power into DC power for use by facilities that require it, such as telecommunications switching offices, thereby enabling telecommunications services supplied by the facility's equipment to be quickly and... | 04/25/2006 |
| 6972546 | Power system A power system causes no variation in output voltage during switching from a linear regulator to a DC-DC converter. The power system switches off a drive circuit of a DC-DC converter and supplies voltage to a load from a linear regulator if the load is light, while ... | 12/06/2005 |
| 6963302 | DC/DC converter A method of controlling a switching element in a switching regulator power supply of a radar. The method of controlling the switching element comprises only switching the switching element during predetermined time intervals, the predetermined time intervals advanta... | 11/08/2005 |
| 6963146 | Modular power control apparatus A modular power control apparatus for use with a plurality of peripheral devices. A plurality of modules, which connect to the peripheral devices, are supported by a housing. An interface module is supported by the housing to selectively interface with the plurality... | 11/08/2005 |
| 6927607 | Inverter driver and method An inverter driver comprises: an inverter circuit including first and second switches, inverting DC components into AC components in response to switching by the first and second switches to drive a load; a control signal supply outputting a first voltage correspond... | 08/09/2005 |
| 6919709 | Battery charger A battery charger has a particularly advantageous application in the field of mobile radio terminal batteries. The charger generates an output voltage and an output current for charging a battery and includes a first regulator, a second regulator for regulating the ... | 07/19/2005 |
| 6856040 | Variable speed wind turbine having a passive grid side rectifier with scalar power control and dependent pitch control A variable speed wind turbine having a passive grid side rectifier using scalar power control and dependent pitch control is disclosed. The variable speed turbine may include an electrical generator to provide power for a power grid and a power conversion system cou... | 02/15/2005 |
| 6677715 | Portable electronic ballast A portable lighting ballast includes first and second transistors 20, 22 for converting direct current from a voltage source 16 into alternating current to operate a lamp 10. The lamp has an ignition voltage that is significantly higher than the voltage t... | 01/13/2004 |
| 6633932 | Method and apparatus for using a universal serial bus to provide power to a portable electronic device A method and apparatus for using a universal serial bus "USB" in a computer as a power source for a portable electronic device. In one embodiment of the invention, a computer (26) having an external USB connector (38) is coupled to the external power inpu... | 10/14/2003 |
| 6593521 | Power converter integrated solar cell module This invention is a power converter integrated solar cell module having a power converter mounted on the rear surface of a solar cell module. This solar cell module has a structure by which the power converter is attached to a low-temperature portion on t... | 07/15/2003 |
| 6566764 | Variable speed wind turbine having a matrix converter A variable speed wind turbine is disclosed comprising a turbine rotor that drives a doubly-fed induction generator, a matrix converter which converts variable frequency output into constant frequency output, and a control unit and a protection circuit for... | 05/20/2003 |
| 6528966 | Sensorless vector control apparatus and method thereof A sensorless vector control apparatus includes a speed controller for receiving a speed command value from a user and outputting a synchronous speed; a `d` and `q` axis voltage command unit for receiving the synchronous speed and outputting a `d` axis vol... | 03/04/2003 |
| 6403148 | Magnetooptical recording medium on which high-density information can be recorded and method of reproducing the recorded information A magnetooptical recording medium includes a first magnetic layer, a second magnetic layer whose Curie temperature is lower than that of the first magnetic laye, and a third magnetic layer, comprising a vertically-magnetizing film, whose Curie temperature... | 06/11/2002 |
| 6329589 | Solar panel A solar panel arrangement for capturing solar energy and supplying power for use in a building. Solar cells are embedded in a window pane and generate electrical direct current that is converted, by an electrical circuit permanently attached to the pane, ... | 12/11/2001 |
| 6138242 | Power adapter for powering a remote device through a computer data port A power adapter for powering a remote device for use with a portable computer. The power adapter has a first plug for connecting to a data port of the portable computer and for sourcing power from the data port. Also provided is a power converter electric... | 10/24/2000 |
| 6096446 | Magnetooptical recording medium and method of producing the same To obtain a magnetooptical recording medium with a magnetooptic effect suitable for ultraviolet radiation, x-layers and y-layers are sequentially laminated on a glass substrate, where x is a TbFeCo layer and y is a Pt or NdCo layer. This multilayer thin f... | 08/01/2000 |
| 6049881 | Power adapter for powering a remote device through a computer data port A power adapter for powering a remote device for use with a portable computer. The power adapter has a first plug for connecting to a data port of the portable computer and for sourcing power from the data port. Also provided is a power converter electric... | 04/11/2000 |
| 6046551 | Device for controlling lighting of discharge lamp and H-bridge circuit for use in such a device A discharge lamp lighting control device comprises an H-bridge circuit connected between the secondary coil of a transformer and a discharge lamp and provided with a first pair of transistors and a second pair of transistors, capable of converting a DC vo... | 04/04/2000 |
| 6031400 | Circuit with multiple output voltages for multiple analog to digital converters A circuit for generating at least two output voltages in response to an input current. A first stage comprises a first impedance for providing a first output voltage when the input current passes through the first impedance. At least a second stage compri... | 02/29/2000 |
| 5963435 | Apparatus for coating metal with oxide An electrolysis apparatus for coating a metal, typically aluminum, with an oxide, which applies long voltage pulses to the control electrodes of the thyristors 13, 14, 15, 16. The thyristors control the flow of alternating current between the metal sample... | 10/05/1999 |
| 5952855 | Circuit with multiple output voltages for multiple analog to digital converters A circuit for generating at least two output voltages in response to an input current. A first stage comprises a first impedance for providing a first output voltage when the input current passes through the first impedance. At least a second stage compri... | 09/14/1999 |
| 5790388 | Antiseismic static electrical converter apparatus An antiseismic static electrical converter installation comprises a valve assembly mounted on a platform, the platform being suspended at each of two opposite ends from a series of rods which are attached in a spaced-out relationship to a horizontal beam,... | 08/04/1998 |
| 5686766 | Islanding-operation prevention apparatus, and dispersed power generation apparatus and power generation system using the same Even when a plurality of dispersed power generation systems are connected to a utility gride, an islanding-operation prevention apparatus can easily and assuredly prevent an islanding operation of each dispersed power supply constituting the corresponding... | 11/11/1997 |
| 5513087 | Arcjet startup using a shunt output high voltage pulse circuit There is disclosed a power supply for igniting and sustaining an electric arc in an arcjet thruster. The power supply is capable of delivering a short duration, high voltage pulse for igniting the arc and then providing a continuous low voltage, high ampe... | 04/30/1996 |
| 5146395 | Power supply including two tank circuits The present invention provides a power supply for supplying electrical power to a load. The power supply includes first and second tank circuits having a common resonant frequency, and functions repetitively in two "major periods." In the first major peri... | 09/08/1992 |
| 4937730 | Constant voltage power supply A constant voltage power supply that includes an enclosure and a transformer positioned within the enclosure. The transformer has a primary winding and first and second sets of secondary windings mounted and magnetically coupled to each other all on a sin... | 06/26/1990 |
| 4886979 | Power source circuit device for monitors and host computers An improved power source device for monitors and host computers includes a first power source arrangement having a plug at one end and a capacitor parallel-connected at the other end which is electrically coupled with an internal circuit of a monitor for ... | 12/12/1989 |
| 4507720 | Automotive/home power interconnection system A system for conveniently and safely accessing and utilizing the electrical system of a vehicle to provide suitable electrical power output for emergency use with conventional appliances and lighting fixtures, by electrifying the existing parallel distrib... | 03/26/1985 |
| 4360741 | Combined antenna-rectifier arrays for power distribution systems An electrical power distribution system wherein electromagnetic energy irradiates a large spatial area is configured to include an array of antenna-rectifier modules wherein the receive aperture of each module is established in accordance with the electro... | 11/23/1982 |
