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| Number | Title | Issue Date |
| 7317264 | Method and apparatus to independently control contactors in a multiple contactor configuration A method and apparatus to independently control the closing or making of contactors in a modular contactor assembly is disclosed. The apparatus includes a contactor assembly having multiple contactors such that each contactor is separately controlled such that one c... | 01/08/2008 |
| 7305311 | Arc detection and handling in radio frequency power applications A radio frequency power delivery system comprises an RF power generator, arc detection circuitry, and control logic responsive to the arc detection circuitry. A dynamic boundary is computed about the measured value of a parameter representative of or related to the ... | 12/04/2007 |
| 7259945 | Active arc-suppression circuit, system, and method of use An active arc suppression circuit and systems and methods of use to suppress arcing in an electro-mechanical apparatus. The preferred circuit includes an electro-mechanical switch and a solid state shunt switch for temporarily shunting current around the electro-mec... | 08/21/2007 |
| 7248008 | Shaded-pole A.C. motor with dynamic brake Am improved shaded pole A.C. motor with dynamic brake that includes a secondary high resistance winding that is selectively connected to a D.C. source when the A.C. voltage is removed. To stop a motor the A.C. voltage applied to the motor is removed with tandem swit... | 07/24/2007 |
| 7239492 | Control system for at least one vacuum interrupter gap A control system for at least one vacuum interrupter gap in a high-voltage switching device includes at least one non-reactive control resistor disposed in parallel with the vacuum interrupter. The non-reactive control resistor merges concentrically onto the vacuum ... | 07/03/2007 |
| 7224287 | Method for determining the switching state of a contact and evaluation circuit corresponding thereto An input voltage contacted at the input of a contact can be through-connected to an output of the contact or switched off via a movable contactor. In order to determine the switching state of the contact, any drop in the contact voltage between the input and the out... | 05/29/2007 |
| 7196434 | Modular contactor assembly having independently controllable contractors The present invention provides an electrical isolation apparatus having independently controllable contactors. The isolation apparatus includes a contactor for each phase or pole of an electrical device as well as each phase or pole of a load. Each contactor is cons... | 03/27/2007 |
| 7184254 | Apparatus and method for controlling the maximum stroke for linear compressors An apparatus and method for controlling the maximum stroke of a linear compressor is provided. The shorting of the normal supply voltage of a compressor to ground is used to detect overstroking. A plurality of transistors are electrically coupled to the control circ... | 02/27/2007 |
| 7151330 | Apparatus and method for generating high voltages using a voltage inversion generator and multiple closed-path ferrites A vector inversion generator utilizes closed-path ferrites to modify the characteristics of the generator. The closed-path ferrites increase an inductance within a portion of the generator and additionally provide a protective shield for associated electronic circui... | 12/19/2006 |
| 7110225 | Arc-limiting switching circuit First and second switches and an arc-limiting switch are closed during a turn-on sequence in a switching circuit. The arc-limiting switch is left open during a turn-off sequence. Current flow through the switching circuit may be broken by opening the first or second... | 09/19/2006 |
| 7079363 | Hybrid DC electromagnetic contactor In a hybrid DC electromagnetic contactor, by including a power unit for supplying a certain power voltage; a main contact point of a breaking switch for providing a supply path of the power voltage by being switched in accordance with a voltage apply to an operation... | 07/18/2006 |
| 7057311 | Isolation contactor assembly having independently controllable contactors The present invention provides an electrical isolation apparatus having independently controllable contactors. The isolation apparatus includes a contactor for each phase or pole of an electrical device as well as each phase or pole of a load. Each contactor is cons... | 06/06/2006 |
| 6956728 | Method and apparatus to control modular asynchronous contactors A modular asynchronous contactor assembly includes a contactor for each phase or pole of an electrical device. The contactor assembly is applicable as both a switching device and an isolation or load protection device. As such, each contactor is constructed so that ... | 10/18/2005 |
| 6909585 | Protection circuit protecting against voltage irregularities Protection circuits (1) to be located between power supplies (2) and further circuitries (20,30) for protecting further circuitries (20,30) against voltage irregularities and comprising main transistors (7) coupled to switching cir... | 06/21/2005 |
| 6687100 | Method of dissipating energy from a contactor coil A method of rapidly dissipating energy from a contactor controlled by a switching device, the steps comprising: operably connecting a metal oxide varistor to the switching device; interrupting electrical current to the contactor; absorbing energy from the... | 02/03/2004 |
| 6466420 | High voltage disconnector having a moving contact that is moved at high speed A high voltage electrical disconnector that has a moving contact that moves at high speed comprises a moving first contact which is mounted to move along an axial direction relative to a fixed second contact, and which co-operates therewith to establish a... | 10/15/2002 |
| 6075684 | Method and arrangement for direct current circuit interruption In the direct current circuit interruption arrangements disclosed in the specification, a solid state circuit interrupter interrupts the connection in a circuit path between a power source and a load. The stored energy in the circuit is dissipated in a re... | 06/13/2000 |
| 5854729 | Power system device and method for actively interrupting fault current before reaching peak magnitude A device/method for actively interrupting fault current in an ac or dc power system before the fault current is capable of growing to peak magnitude or steady state condition, respectively, is presented. In an ac implementation, a commutating capacitance ... | 12/29/1998 |
| 5703743 | Two terminal active arc suppressor The arc suppression circuit includes an insulated gate bipolar junction transistor (IGBT) connected across the electrical switch contacts to be protected. When the contacts open, the combination of added Miller capacitance and the gate-to-emitter capacita... | 12/30/1997 |
| 5517378 | Direct-current breaker for high power for connection into a direct-current carrying high-voltage line A high power d.c. breaker for connection into a d.c. carrying high-voltage line (L), has two normally closed and electrically series-connected mechanical breaks (BSI, BSII) adapted to be traversed by the line current (I) and to be opened for breaking the ... | 05/14/1996 |
| 5502609 | Electric circuitry for preventing contactor tip contamination in dry switching applications A contactor control system for a DC electric power system for reducing contactor tip contamination from dry-switching includes a first switch connected in circuit between a power source and a controller for enabling the controller upon closure of the firs... | 03/26/1996 |
| 5452170 | Commutation type DC breaker A commutation type DC breaker having a commutation circuit electrically connected in parallel to a main contact. The main contact is connected between a DC power supply and a load. The commutation circuit is a series circuit of a commutation capacitor, a ... | 09/19/1995 |
| 5402297 | Commutating type DC circuit breaker arrangement A commutating type DC circuit breaker arrangement comprising: a vacuum circuit breaker having a movable electrode and stationary electrode; a series circuit of a capacitor, a saturation reactor and a commutating switch which is connected in parallel with ... | 03/28/1995 |
| 5214557 | D.C. vacuum circuit breaker for an electric motor vehicle A vacuum circuit breaker particularly suitable for use in an electric motor vehicle. The circuit breaker includes a vacuum interrupter to which a voltage is applied, the series combination of a capacitor and a switch which are connected in parallel with t... | 05/25/1993 |
| 5210674 | Superconducting coil protective system A superconducting coil protective system comprises a quenching detector (QD) for detecting occurrence of a quenching in a superconducting coil (L) and generating a quenching signal indicative of the occurrence of the quenching. In response to the quenchin... | 05/11/1993 |
| 4805062 | DC circuit breaker and method of commutation thereof A DC circuit breaker and a method of commutation during a commutation capacitor capable of being directly charged from a main DC line are disclosed. A breaker unit is inserted in a main DC line and is connected through a first switch in parallel to a seri... | 02/14/1989 |
| 4740858 | Zero-current arc-suppression dc circuit breaker A zero-current arc-suppression circuit breaker arrangement having a series circuit including a capacitor power source previously charged and a switch connected in parallel with a series circuit formed of a circuit breaker and a diode. Upon operation, the ... | 04/26/1988 |
| 4618905 | DC circuit breaker A line voltage charging type DC circuit breaker for use in DC transmission, having a series circuit connected in parallel with a commutation breaker, the series circuit being constituted by a capacitor to be charged by a line voltage, a reactor, and a cir... | 10/21/1986 |
| 4578730 | High-voltage DC circuit breaker apparatus There is disclosed a high-voltage DC circuit breaker apparatus with reverse current insertion system by line voltage charge, which comprises a commutation switch, a series circuit of a capacitor, a reactor and a switch connected in parallel with the commu... | 03/25/1986 |
| 4544978 | Circuit for the arcless de-energization of a direct current load A circuit for the arcless de-energization of a direct current load receiving direct current from a rectified alternating current source. The circuit includes a means for rectifying alternating current from an alternating current source to provide direct c... | 10/01/1985 |
| 4449162 | Drive circuit A drive circuit for an electromagnetic device includes an inductor which can be connected across a pair of supply lines by way of a first switch. Energy is stored in the core of the inductor which can be released into the device to cause rapid operation t... | 05/15/1984 |
| 4442469 | DC Circuit breaker apparatus A DC circuit breaker apparatus comprises a first interrupter and a second interrupter connected in series. A first capacitor and a discharge gap are respectively connected in parallel with the first and second interrupters. An impedance element is connect... | 04/10/1984 |
| 4356525 | Method and circuit for controlling a hybrid contactor A method and circuit for minimizing DC current offset generated by the voltage-integrating property of an inductive load. First, second and third hybrid contactors connect first, second, and third output lines of an AC power source to first, second, and t... | 10/26/1982 |
| 4346420 | Magnetoplasmadynamic switch A magnetoplasmadynamic switch adapted to be coupled in parallel with an ictive energy storage circuit carrying current through an initially closed circuit interrupter. The switch includes an electrode spaced by a gap from an arcjet source which is trigge... | 08/24/1982 |
| 4319296 | Series connected oscillating transverse field interrupter and method The invention provides a technique for interrupting current employing a plurality of series connected vacuum arcs in parallel with a resonating circuit. At least one of the series vacuum arcs is subjected to an oscillating transverse magnetic field which ... | 03/09/1982 |
| 4307428 | Circuit breaker apparatus for high voltage direct currents A circuit breaker apparatus of high voltage direct currents is connected in series with an external circuit comprising an AC-DC converting device connected to an AC power supply and a DC reactor connected to the AC-DC converting device, and comprises a ci... | 12/22/1981 |
| 4305107 | DC Interrupting apparatus A DC interrupter unit as provided between a DC power source unit and a load unit. The DC interrupter unit includes a DC interrupter section having at least one interrupter to interrupt a DC current and a saturable reactor connected between the interrupter... | 12/08/1981 |
| 4300181 | Commutation circuit for an HVDC circuit breaker A commutation circuit for a high voltage DC circuit breaker incorporates a resistor capacitor combination and a charging circuit connected to the main breaker, such that a commutating capacitor is discharged in opposition to the load current to force the ... | 11/10/1981 |
| 4287436 | Electrical circuit for driving an inductive load An electrical circuit for driving an inductive load includes an output transistor of one conductivity type and a detector transistor of the other conductivity type. The output transistor has an emitter connected to a power source, a base to which an input... | 09/01/1981 |
| 4249223 | High voltage DC contactor with solid state arc quenching An arc quenching circuit senses initiation of an arc across the contacts of a contactor, commutates a capacitor discharge to the contacts that brings the contact voltage to zero for arc extinction and promptly recharges the capacitor to enable reoperation... | 02/03/1981 |
