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| Number | Title | Issue Date |
| 7504750 | Device of protection against a polarity reversal A device for protecting a circuit against a polarity reversal of a connection to a D.C. power supply, comprising a controllable switch interposed on said connection between a first terminal of a first voltage of the D.C. power supply and a first terminal of the circ... | 03/17/2009 |
| 7348689 | Switching circuit and a method of operation thereof This invention relates to the operation of a switching circuit, such as a bridge circuit. The invention provides a method of generating pulsed first and second switching signals for switching first and second switches of a switching circuit further comprising an out... | 03/25/2008 |
| 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 |
| 7193336 | Switchable low-loss cryogenic lead system A method and apparatus for reducing conductive thermal losses in high-current cryogenic power electronics systems needing large cables to interface between warm and cold environments. Thermal losses increase with increasing cross-sectional area. The total current at... | 03/20/2007 |
| RE39446 | Power filter circuit responsive to supply system fault conditions A power filter circuit for protecting electronic equipment from electromagnetic interference introduced by a supply system circuit includes a fault/condition sensing circuit capable of detecting whether the supply system circuit is properly wired. The sensing circui... | 12/26/2006 |
| 7119459 | Intelligent switch for connecting power to a load A switching circuit includes a microchip which, in response to a signal from a signal switch, controls the operation of a power switch which, when closed, connects a load to a battery. The microchip can monitor the status of the battery and control the power switch ... | 10/10/2006 |
| 6946752 | Input power stabilizing circuit An input power stabilizing circuit, adapted to be disposed between a DC power source and a load to which DC power from the source is to be supplied. Voltage on a capacitor in the input power stabilizing circuit is prevented as much as possible from causing reverse c... | 09/20/2005 |
| 6930409 | Electromechanical switching device An electromechanical switching device ensures automatic selected polarity interconnection between terminals of two power sources. A double pole double throw (DPDT) switch has three pairs of contacts. A first pair of leads connect to two pairs of contacts in a manner... | 08/16/2005 |
| 6927959 | Method for operating an electromagnetic switching device and electromagnetic switching device Switching contacts of a switching device are provided to ensure optimum service life. An optimum switching point, in terms of the load of one of the switching contacts, is determined depending on a current path that is measured during the switching process and the s... | 08/09/2005 |
| 6661122 | Polarity independent power supply control methods and systems using the same A method of controlling a power supply having an output activated in response to a first logic level of a control signal and deactivated in response to a second logic level of the control signal. A clock is generated on a second power source and used to t... | 12/09/2003 |
| 6466627 | Pulse signal transmitting circuit and subscriber's line terminal apparatus using the pulse signal transmitting circuit A pulse signal transmitting circuit generates a pulse signal having an enhanced high-frequency component with a reduced power loss. A pulse signal is transmitted to a load circuit through a transmission cable connected to a secondary winding of a transfor... | 10/15/2002 |
| 6166451 | Distributed airbag firing system and interface circuit therefor A distributed airbag firing system (10) includes a controller (12) receiving sensor signals from a sensor (20) over a two-wire bus (18). The controller provides a firing command over to the two-wire bus to a squib driver circuit (26), which provides the f... | 12/26/2000 |
| 6040969 | Power filter circuit responsive to supply system fault conditions A power filter circuit for protecting electronic equipment from electromagnetic interference introduced by a supply system circuit includes a fault condition sensing circuit capable of detecting whether the supply system circuit is properly wired. The sen... | 03/21/2000 |
| 6008733 | Air conditioning system master/slave control unit determination A plurality of air conditioning system control units are connected to each other through a communication line (20). Discharge resistors (R1, R2) are provided for discharging residual charges of the communication line (20). The control unit has a power sup... | 12/28/1999 |
| 5828309 | Power source miswiring detection apparatus A power source miswiring detection apparatus for detecting a miswiring of wires of a power source, including a pulse generator for generating a first pulse having a pulse width corresponding to a first phase difference between a first pair of two phases o... | 10/27/1998 |
| 5821643 | Synchronization control scheme for a plurality of switching circuits, method of operation therefor and battery plant employing the same A synchronization control scheme that provides a drive signal to a plurality of switching circuits and method of operation therefor. The synchronization controller, includes: (1) a plurality of dual threshold relaxation oscillators, coupled to a correspon... | 10/13/1998 |
| 5818130 | Method and arrangement for appropriately polarity recognition and switchover of an output stage For appropriately polarity recognition and corresponding switchover of a output stage of a proximity switch or the like connected to a supply voltage (VB), even while continuously activated, when a change in load polarity occurs, the proximity switch havi... | 10/06/1998 |
| 5682067 | Circuit for reversing polarity on electrodes A circuit for reversing a voltage polarity on a first electrode and a second electrode may comprise a first inductor connected between the first electrode and a negative terminal of an external power supply. The positive terminal of the power supply is co... | 10/28/1997 |
| 5646463 | Synchronization control for interrelated DC voltage/battery polarity switching circuits A plurality of battery/voltage polarity switching circuits are constrained to operate in switching synchronism by a timing circuit associated with each polarity switching circuit that are interrelated to one another such that only the fastest response tim... | 07/08/1997 |
| 5646462 | DC voltage bypass power system architecture A power plant system architecture includes a plurality of battery polarity switching circuits for providing uninterruptible power/voltage to a plurality of loads, each of which is powered by low frequency AC, and which is also powered by a DC voltage. DC ... | 07/08/1997 |
| 5440180 | Microprocessor based electrical contactor with distributed contactor opening A multiphase contactor with solid state circuity gating rectified pulses to an electromagnetic coil to close and hold closed contacts for each phase, sequentially for each successive opening of the contactor adjusts the delay angle of the last pulse to ro... | 08/08/1995 |
| 5045670 | Method and apparatus for extending the brush life of a cooling fan in an electronic welder An improved electronic welding station is disclosed. The welding station provides for an improved arc striking capability by providing a higher arc striking voltage and a large arc striking current and, once the arc is struck, automatically switches over ... | 09/03/1991 |
| 4906861 | Superconducting current reversing switch A superconducting switching device having no moving components for reversing current flow through a load. This load typically is a superconducting magnet and, in this application, the present invention also selectively serves as a persistent switch. The i... | 03/06/1990 |
| 4868504 | Apparatus and method for locating metal objects and minerals in the ground with return of energy from transmitter coil to power supply Eddy current type metal detector for locating and distinguishing between different classes of metal objects, and geophysical apparatus for measuring various properties of soil and rock. A nonsinusoidal transmit voltage energizes a transmit coil which tran... | 09/19/1989 |
| 4739461 | Power supply device for providing positive and negative DC voltages on the secondary of a transformer A power supply device capable of supplying high DC voltages of positive and negative polarities has a transformer having a primary coil and two secondary coils. A DC current supplied to the primary coil is switched to generate voltages in the secondary co... | 04/19/1988 |
| 4682046 | Positive or negative voltage power supply with slideable carrier switching mechanism An electrical apparatus for regulating voltage polarity including a support for slidably receiving one or more carriers therein, with each carrier including circuitry. A positive and negative source of power is associated with the apparatus and each of th... | 07/21/1987 |
| 4583091 | Serial signal transmission system In a serial signal transmission system for transmitting data signals in a serial manner from a transmitting part to a receiving part of the system, both supplied power from a common power source, are provided a signal line extended between the two parts, ... | 04/15/1986 |
| 4425512 | Power supply system A power supply system for supplying a d.c. current from a center equipment to a terminal device through a two-wire line, is capable of properly supplying the current for communicating purposes irrespective of the connection condition of the two-wire line ... | 01/10/1984 |
| 4185561 | Automatic switching system An automatic switching system particularly adapted for railroad hobbyists whereby the complicated polarity switching usually required is eliminated. Apparatus is associated with each insulation point in a track section (block) to sense the direction of tr... | 01/29/1980 |
| 4153922 | Relay control circuit A relay control circuit is disclosed in which a timer circuit is actuated by a reference clock pulse in synchronism with an AC voltage supplied by a commercial power supply. An output signal of the timer circuit causes current to flow in the coil of the r... | 05/08/1979 |
| 4086624 | Current to voltage converter Disclosed is a circuit for converting a current input of either polarity to a low voltage output of a single polarity. The circuit includes two pairs of pnp-npn transistors which are coupled to that current flow in one direction will turn on one pair whil... | 04/25/1978 |
| 4065807 | DC-to-DC voltage converter employing a common transistor in both switching and multivibrator functions In this converter, a common transistor Q2 is one of the two transistors Q1 and Q2 of a multivibrator and is also one of a pair of power switching transistors Q2 and Q3 that are connected in series across an input port receiving an input voltage-V of one p... | 12/27/1977 |
