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| Number | Title | Issue Date |
| 7768241 | Device for adjusting the impedance of a high voltage line supplying an alternating current A device (8), for adjusting the impedance of a high voltage line (9), supplying an alternating current, has at least one control coil (2), which may be inserted in series in the high voltage line (9) and at least one switching device (... | 08/03/2010 |
| 7489115 | Method in an electric net data transmission system for keeping the signal level constant in a coupling furnished with supply cable Method in low voltage net data transmission system for keeping the signal level of transmission constant on the net voltage rail or on wall outlet. In the method the feedback signals are taken wired or wirelessly from one or some locations of the actual apparatus or... | 02/10/2009 |
| 7402990 | Reduction of energization transients in a three phase power system A method and an apparatus for reducing energization transients in a three phase AC power system which includes an electrical device having legs A, B and C associated with corresponding phases of the power system. The method includes the steps of connecting the legs ... | 07/22/2008 |
| 7402989 | Capacitor multiplier A capacitor multiplier including a capacitor, a first voltage follower, a first impedance element, and a second impedance element is provided. The input terminal of the first voltage follower is electrically connected to the first terminal of the capacitor. Wherein,... | 07/22/2008 |
| 7323213 | Apparatus and method for discharge surface treatment An apparatus has a green compact electrode including a material of a coating formed on a workpiece by a discharge, a power source for supplying a first voltage, a voltage detector for detecting a voltage between the workpiece and the electrode, and a pulse current g... | 01/29/2008 |
| 7317301 | Auxiliary power supply An auxiliary power supply equipment for a high voltage installation includes a power source at ground potential, a load circuit at high potential, and a transmission link for coupling the power source to the load circuit. The power source includes a high frequency v... | 01/08/2008 |
| 7307362 | Solid-state microsecond capacitance charger for high voltage and pulsed power A solid-state high-voltage pulse generator based on a three-phase chopper capacitance charger is described. In a first phase, an intermediate capacitor is resonance-charged via a diode. In a second phase, the intermediate capacitor is discharged to the load through ... | 12/11/2007 |
| 7262578 | Direct control of an induction motor This invention relates to sensorless control (i.e. without encoder at the motor shaft) of an induction motor (AC asynchronous motor). In particular, the invention comprises a method for a direct measurement of the electromotive forces (EMF) at the stator of the moto... | 08/28/2007 |
| 7253403 | Control system for a power supply A control system (12) for a power supply (14), such as a high voltage power supply, includes a control circuit (16) and a feedback circuit (18, 28, 30). The feedback circuit (18, 28, 30) is configured to produce a feedback signal i... | 08/07/2007 |
| 7235900 | Switching apparatus and method for varying a phase line impedance of an electric power transport line section The switching apparatus and method are provided for varying the impedance of a phase line of a segment of an electrical power line. The phase line includes n conductors electrically insulated from each other and short-circuited among each other at two ends of the se... | 06/26/2007 |
| 7142811 | Wireless communication over a transducer device One aspect of the present invention is generally directed towards a system and method of tuning a transducer for transmitting and receiving a wireless signal. In an illustrative embodiment, a single transducer is coupled to a first or second circuit for either trans... | 11/28/2006 |
| 7116010 | Control of small distributed energy resources A power electronics interface in a microsource controller allows efficient connection in a power system of small, low cost and reliable distributed generators such as microturbines, fuel cells and photovoltaic. Power electronics provide the control and flexibility t... | 10/03/2006 |
| 7091872 | Controlled power source for underground line location A transmitter for a line locator system that controls the electrical current, voltage or power applied to the target line is disclosed. Control of the electrical output of the transmitter can be achieved passively or by means of a feedback control system. A transmit... | 08/15/2006 |
| 7091703 | Dynamic reactive compensation system and method The invention features a system for connection to a utility power network. The system includes a reactive power compensation device coupled to the network and configured to transfer reactive power between the utility power network and the reactive power compensation... | 08/15/2006 |
| 7067011 | Apparatus and method for discharge surface treatment An apparatus has a green compact electrode including a material of a coating formed on a workpiece by a discharge, a power source for supplying a first voltage, a voltage detector for detecting a voltage between the workpiece and the electrode, and a pulse current g... | 06/27/2006 |
| 7042198 | System using a power converter EMI noise in a system using a power converter with switching control is reduced in a simple configuration. The power converter 3 includes a converter 31, a smoothing capacitor 32, and an inverter 33, and receives the power from an ... | 05/09/2006 |
| 6992872 | Circuit breaker incorporating fault lockout protection A method of protecting multiple feeder circuits fed from a shared electrical distribution system is provided. The method includes providing a bypass line, providing bypass switches in the bypass line, providing a fault lockout protection controller coupled to the by... | 01/31/2006 |
| 6984962 | Device and a method for voltage control in an electric transmission network A device for control of a compensator connected to a polyphase electric transmission network for reactive electric power in dependence on a voltage sensed in the transmission network. A voltage controller, in dependence on the difference of a reference value for the... | 01/10/2006 |
| 6982546 | Hybrid reactive power compensation device A hybrid reactive power compensation device comprises a passive type reactive power compensator and an active type reactive power compensator serially connected thereto. The passive type reactive power compensator is an AC power capacitor adapted to provide the reac... | 01/03/2006 |
| 6906501 | Control method for parallel-connected power converters A control method for the parallel-connected power converters includes a control circuit comprising a voltage feedback circuit and a current feed-forward circuit. The voltage feedback circuit, consisting of a voltage regulated control circuit and a waveform control c... | 06/14/2005 |
| 6906434 | Electric utility system with superconducting magnetic energy storage a voltage recovery device is configured to provide real and reactive power to a utility power network at a sufficient level and for a sufficient duration to recover the voltage on the utility power network within a predetermined proportion of the nominal voltage, fo... | 06/14/2005 |
| 6876178 | Hybrid reactive power compensation device A hybrid reactive power compensation device comprises a passive type reactive power compensator and an active type reactive power compensator serially connected thereto. The passive type reactive power compensator is an AC power capacitor adapted to provide the reac... | 04/05/2005 |
| 6819089 | Power factor correction circuit with high-voltage semiconductor component A switching power supply including a power factor correction circuit comprises a rectifier, an inductor coupled in series with the rectifier, a semiconductor switch formed by a compensation device coupled in parallel with the rectifier and the inductor. The output c... | 11/16/2004 |
| 6801022 | Universal electrical energy saver A universal electric energy saver to recuperate power losses comprised of a bank of condensers connected in parallel; a bank of resistors with some connected in parallel while others are connected in series; a transformer to step down the voltage to power up a small... | 10/05/2004 |
| 6783795 | Power supply apparatus for discharge surface treatment In a power supply apparatus for discharge surface treatment which uses a green compact electrode as a discharge electrode, allows a pulse-type discharge to take place between said discharge electrode and a workpiece, and forms a film, which is made of an electrode m... | 08/31/2004 |
| 6702896 | Apparatus and method for discharge surface treatment In a power supply apparatus for discharge surface treatment which uses a green compact electrode as a discharge electrode, allows a pulse-type discharge to take place between said discharge electrode and a workpiece, and forms a film, which is made of an ... | 03/09/2004 |
| 6693409 | Control system for a power converter and method of controlling operation of a power converter A control system (20) for a power converter (22) designed to convert DC power from a source (30) such as a battery, flywheel or fuel cell into AC power. The control system includes an impedance current regulator (106) for providing an impedance current si... | 02/17/2004 |
| 6690143 | Power factor correction circuit with resonant snubber A power factor correction (PFC) circuit with a resonant snubber. The power factor correction (PFC) circuit has an input part (601) for receiving an AC voltage and outputting a first DC voltage; a main part (604) for converting the first DC voltage to a se... | 02/10/2004 |
| 6653822 | Circuit for converting AC voltage into DC voltage A circuit for converting AC voltage into DC voltage for one or two devices (Rm, Ra), includes a first part of the current being fed to the input side via a large induction coil (L50) and a first rectifier (Gm), and a second part of the current being fed v... | 11/25/2003 |
| 6483501 | Load current compensated type voltage sampling circuit A load current compensated voltage sampling circuit is characterized by a sampling voltage that is compensated by utilizing different load current values of the detected sample as parameters for transforming into the intended display target value.... | 11/19/2002 |
| 6371265 | Electric railway vehicle and an electric powering unit in particular for such a vehicle An electrical power supply unit powers a load, in particular a transformer (8), from a power source (10) via electrical switchgear (14), in particular a circuit-breaker, and it includes an interference attenuator (16) of the ferrite type for attenuating i... | 04/16/2002 |
| 6369550 | Method and apparatus for reducing input impedance of a preamplifier A feedback circuit is provided for reducing the input impedance of a preamplifier circuit, such as for use with a sensing coil in an imaging system. The feedback circuit permits adjustment of the input impedance by balancing inductive and capacitive compo... | 04/09/2002 |
| 6359423 | Method and system for suppressing a voltage fluctuation in a power system A system for compensating a voltage fluctuation in a transmission line of a power system is such that a power detection circuit detects a voltage and power flow in the transmission line involving a voltage fluctuation to be compensated, a calculation circ... | 03/19/2002 |
| 6343024 | Self-adjustable impedance line driver with hybrid A pair of equivalent controlled impedance buffers are connected in a push-pull configuration to a transformer primary coil. A pair of equivalent pre-drivers are connected to the pair of buffers. Each pre-driver receives a driver input signal and outputs a... | 01/29/2002 |
| 6091612 | Universal power supply for arc welder A single phase power supply for electric arc welders comprising: a full wave rectifier forming the input of said power supply; a valley fill power factor correcting circuit for controlling input current flow to the rectifier and creating an high crest fac... | 07/18/2000 |
| 6069469 | Controller for power converter The controller for a power converter of the present invention, connects a transformer in series with the AC system, and has devices which find the voltage drop portion generated by the impedance of this transformer when introducing a voltage in series by ... | 05/30/2000 |
| 6008548 | Programmable logic controller for resonance control in complex capacitor switching A system for regulating the voltage by switching capacitor banks and for preventing damage due to harmonic resonance in an AC power supply line after a capacitor bank is switched. The system includes a detector for detecting the harmonic distortion in the... | 12/28/1999 |
| 5927598 | Energy management method and apparatus An energy management system designed to reduce the costs of electrical energy particularly applicable to service businesses such as restaurants, service stations, convenience and grocery stores and the like. The system includes controllers to sequentially... | 07/27/1999 |
| 5818126 | Power transfer controller A method and apparatus for controlling power transferred and regulating voltage in a multi-phase transmission line includes generating a first plurality of voltages, a second plurality of voltages displaced in phase from the first plurality of voltages, a... | 10/06/1998 |
| 5801460 | Electrical power transmitting system with reduced feeder size and method of operation An electrical power transmitting system (50) in accordance with the invention includes an alternating current electrical power generator (12) for producing alternating current on an output having a specified maximum; at least one electrical load (22) whic... | 09/01/1998 |
