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| Number | Title | Issue Date |
| 7982442 | Power system A method for voltage stabilization of an electrical power network system including a producing power network system side, a consuming power network side including a power load, a power transmission line with an impedance ZLN, a transformer and an on-line ... | 07/19/2011 |
| 7973520 | Piezoelectric transformer type high-voltage power apparatus and image forming apparatus A piezoelectric transformer type high-voltage power source apparatus to control an output voltage from a piezoelectric transformer to a load, and an image forming apparatus including the same, the piezoelectric transformer type high-voltage power source apparatus in... | 07/05/2011 |
| 7816894 | Method and apparatus for regulating voltage An AC voltage regulator able to provide a desired voltage to any type of a given load within a predetermined range without any output power interruptions during any transition time, without distortion of the AC sine wave and without high current circulating through ... | 10/19/2010 |
| 7755334 | Voltage regulation device A voltage regulation device adapted for connection to a varying electrical supply and to regulate the voltage supplied to certain selected circuits whose loads benefit from voltage regulation. The device comprises a PWM or phase angle switched autotransformer which ... | 07/13/2010 |
| 7449867 | Multi-phase buck converter with a plurality of coupled inductors A multi-phase converter comprising 2N+1 inductors; and 2N+1 switching converters parallel connected and each including a switched node; wherein N is an even integer, a pair of said inductors are coupled and wound about a common core and each said coupled inductor is... | 11/11/2008 |
| 7378828 | DC-DC converter having magnetic feedback A DC-DC converter suitable for multiple converter circuit topologies is disclosed. The DC-DC converter utilizes magnetic feedback of the output load current to provide broad inductance control of a magnetic element, while inhibiting saturation of the switched windin... | 05/27/2008 |
| 7342321 | Bicycle electric power unit A bicycle electric power unit supplies electric power to a bicycle motor unit having a power source, a power source controller, a power source voltage detector, a first power source switch and a second power source switch. The power source controller turns off the f... | 03/11/2008 |
| 7343501 | Power-saving device for notebook computer A power-saving device implemented as a circuit design for a notebook computer comprises a power supply providing power to notebook computer, a built-in device, a control circuit connecting between the power supply and the built-in device, and a switch connecting to ... | 03/11/2008 |
| 7321834 | Method for calculating power flow solution of a power transmission network that includes interline power flow controller (IPFC) Power flow models of Interline Power Flow Controllers (IPFC) for large-scale power systems are studied, in details. Mathematical models of the IPFC, using the d-q axis decompositions of control parameters are derived. In this framework, for each IPFC, only two contr... | 01/22/2008 |
| 7301440 | Power line communication system and method The present invention provides a device for providing communications through power lines comprised of multiple conductors by transmitting the data signals through a plurality of the conductors. One embodiment of the present invention may be comprised of a transmit c... | 11/27/2007 |
| 7180759 | Push-pull inverter with snubber energy recovery A power inverter comprises a push-pull inverter circuit that includes a transformer having a primary winding coupled to a DC bus and a secondary winding coupled to an AC bus, main power switches coupling each end of the primary winding to a DC return, and one or mor... | 02/20/2007 |
| 7136724 | Electrical power distribution system for street lighting The invention comprises an electric power distribution system for providing power to a plurality of loads. An energy reduction device receives high voltage electrical power from a utility. A processor controls three variable transformer windings to produce electrica... | 11/14/2006 |
| 7113134 | Transformer antenna device and method of using the same The invention contemplates an antenna device, system and method of installing the antenna device for receiving a wireless signal at a pad mounted electrical transformer. The novel device includes an antenna capable of communicating the wireless signal and a material... | 09/26/2006 |
| 7075414 | Device and method for communicating data signals through multiple power line conductors The present invention provides a device for providing communications through power lines comprised of multiple conductors by transmitting the data signals through a plurality of the conductors. One embodiment of the present invention may be comprised of a transmit c... | 07/11/2006 |
| 7052271 | Draft inducer system A draft inducer system has a voltage reducer capable of converting an input AC voltage to a reduced voltage, and an inducer unit capable of being coupled with the voltage reducer. The voltage reducer includes a reducer housing, a set of prongs extending from the red... | 05/30/2006 |
| 6980091 | Power line communication system and method of operating the same The present invention provides a system for operating a power line communications system that is comprised of a plurality of network elements, which may take the form of repeaters, bypass devices, backhaul devices, wireless backhaul devices, enhanced bypass device, ... | 12/27/2005 |
| 6965303 | Power line communication system and method A method of communicatively coupling power line communication (PLC) devices to a first and second overhead power line conductor that travel in a substantially parallel physical arrangement and in spaced-apart relation is provided. The method may comprise coupling a ... | 11/15/2005 |
| 6950567 | Method and apparatus for providing inductive coupling and decoupling of high-frequency, high-bandwidth data signals directly on and off of a high voltage power line The present invention is drawn to an electrically “closed” method and apparatus for transmitting and receiving data signals over a high voltage power line. Inductive coupling is employed for coupling and decoupling the data signal directly on to and off of a sin... | 09/27/2005 |
| 6930472 | Switching regulator circuit A switching regulator circuit for supplying two input potentials to a passive device that is driven by a potential difference between the two input potentials irrespective of potential differences between the two input potentials and a ground potential, includes: a ... | 08/16/2005 |
| 6917225 | Driver circuit for driving a switching transistor The driver circuit for driving a switching transistor comprises a driver transformer for driving the switching transistor and an output stage for driving the driver transformer, and an output of the driver circuit is used for providing also said switching voltage. T... | 07/12/2005 |
| 6882125 | Motor controller with position detector A motor controller includes a motor-position detector, a motor driver and a power cable having a pair of electric lines (two lines) which feeds power from the driver to the detector. The detector superimposes serial information about the motor-position to the power ... | 04/19/2005 |
| 6798675 | Charging a capacitive energy store using energy trapping and adaptive clocking A resonant switching-type capacitive charging power conditioner circuit includes a trap switch assembly to prevent the energy initially delivered to the circuit by an electrical energy source, from returning to the source. Once trapped, all of the energy is transfer... | 09/28/2004 |
| 6788034 | Method for operating a transformer from a drivable voltage source, as well as an apparatus for carrying out the method A method is specified for operating a transformer (1) from a drivable voltage source (2), in which the voltage source, (2) produces an output voltage (uA) for feeding active power and/or a reactive component via the transformer (1 | 09/07/2004 |
| 6713974 | Lamp transformer for use with an electronic dimmer and method for use thereof for reducing acoustic noise A controller for reducing acoustic noise produced during use of a leading edge dimmer, includes a leading edge controller responsive to an input voltage fed thereto for producing a control signal upon detection of a leading edge, and a linear switch coupled to the l... | 03/30/2004 |
| 6703719 | Systems and methods for managing a battery source associated with a microturbine power generating system A microturbine power generating system and associated method for managing a battery source associated with a microturbine power generating system is disclosed. The system and methods enable charging the battery source from the utility grid when the turbin... | 03/09/2004 |
| 6606259 | Clamped-inductance power converter apparatus with transient current limiting capability and operating methods therefor A power converter apparatus, such as a DC--DC converter, includes a switch that controls current transfer between an input port and an inductance. A control circuit is operative, while current is being transferred between the inductance and a clamping cir... | 08/12/2003 |
| 6604055 | System and method for AC line voltage analysis A system and method for AC line voltage analysis is disclosed. According to one embodiment of the present invention, a system for AC line voltage analysis on an AC line includes a transformer that steps down the AC line voltage, a rectifier that rectifies... | 08/05/2003 |
| 6515458 | Pulse oscillator and voltage level converter A signal translating circuit is operable on applied input signal through recurring cycles of conduction and non-conduction of a junction type transistor in response to current transfers between inductors in collector and base circuits through an internal ... | 02/04/2003 |
| 6498464 | System for supplying power to a load connected to a distribution network A system for supplying power to a load connected to a power supply network, to achieve improve operating. the invention provides for the load to be connected via an inductive element, such as a duplex inductor, to the electrical supply network and to an e... | 12/24/2002 |
| 6316755 | Method and apparatus for producing power for an induction heating system An induction heating power supply is disclosed. It includes a power circuit having at least one switch and a power output. The output circuit includes an induction head. The output circuit is coupled to the power output. A controller has at least one feed... | 11/13/2001 |
| 5970139 | T1 channel bank control process and apparatus A technique for powering telephone lines using an unbalance current source and current sink; and a technique for improving attenuation/frequency distribution and return loss (impedance matching) of transformer-coupled wire-line communications circuits by ... | 10/19/1999 |
| 5895979 | Power distribution network incorporating a voltage support transformer and process of use A power distribution network including a voltage support transformer is disclosed which uses the fault current from a line of the power distribution network in which a fault condition exists to support or stabilize the voltage across one or more other lin... | 04/20/1999 |
| 5889373 | Fluorescent lamp ballast with current feedback using a dual-function magnetic device A fluorescent lamp ballast utilizes a single a transformer for providing both tank inductance and current mode feedback to the ballast driver circuitry. The transformer has an "EE" core with inductor windings on the center legs and gate windings on one of... | 03/30/1999 |
| 5757176 | Method and system for controlling output current of a large, low-voltage, DC power supply and obtaining diagnostic information from the operation thereof A method and system for controlling the output current of large, low-voltage, DC power supply which includes at least one transformer primary by controllably switching an AC power line voltage to the primary as a function of actual and desired output curr... | 05/26/1998 |
| 5623171 | High-voltage pulse generating circuit and electrostatic recipitator containing it A high-voltage pulse generating circuit of a charge transfer-type comprising a main capacitor for storing input energy and at least one magnetic pulse compression circuit comprising a saturable reactor, a saturable reactor on the side of a load comprising... | 04/22/1997 |
| 5589760 | Traveller's voltage converter for automatically selecting load wattage A voltage converter for traveller's uses includes: a 50 watts (0-50 W) transformer for converting an input voltage of 220 VAC to an output voltage of 110 VAC for normally powering a load of 50 watts or less; a 1600 watts (50-1600 W) transformer for conver... | 12/31/1996 |
| 5122725 | Negative feedback power supply apparatus In a power supply apparatus for a load such a toroidal core testing apparatus, an input current is supplied to the load, and an output voltage of the load is obtained. A current corresponding to one part of the output voltage is negatively fed back to the... | 06/16/1992 |
| 5109185 | Phase-controlled reversible power converter presenting a controllable counter emf to a source of an impressed voltage A universal phase-controlled reversible power converter having one transformer with multiple windings (i) couples a fixed d.c. voltage to an associated transformer winding through a fixed port having switches controlled for switching by fixed-phase signal... | 04/28/1992 |
| 4896093 | Electronic inductor To produce a high current carring inductor with a high inductance value in space normally too small, a transformer is chosen which meets space requirements and has a primary winding of sufficient current capacity, but too little inductance. A bidirectiona... | 01/23/1990 |
| 4866366 | Negative feedback power supply apparatus In a power supply apparatus for a load such a toroidal core testing apparatus, an input current is supplied to the load, and an output voltage of the load is obtained. A current corresponding to one part of the output voltage is negatively fed back to the... | 09/12/1989 |
