Polarity Reversing Patents (Class 307/138)
  • Patent number: 9929773
    Abstract: A slave control device receives a communication signal from a master control device, and controls loads according to the received communication signal. A modulator superimposes the communication signal from the master control device on power source lines, and a demodulator demodulates the communication signal superimposed on the power source lines and supplies the demodulated communication signal to the slave control device. The modulator is provided on power source lines on a battery side, and the demodulator is provided on the power source lines on a load side. The modulator superimposes the communication signal on the power source lines which are on a side closer to the loads with respect to the modulator among the power source lines.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: March 27, 2018
    Assignee: YAZAKI CORPORATION
    Inventors: Akiyoshi Kanazawa, Atsushi Takahashi, Kazuo Sugimura, Takaaki Izawa
  • Patent number: 9343974
    Abstract: A power source apparatus includes a transformer configured to output a voltage, a feedback unit configured to output a feedback signal based on the voltage output from the transformer, and a driving unit configured to drive the transformer according to a setting signal for setting the output voltage and the feedback signal. Whichever of a voltage of positive polarity and a voltage of negative polarity is output, the feedback unit controls the voltage output according to a value of a difference between the output voltage and a threshold value.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: May 17, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Jun Kawakatsu
  • Patent number: 9099876
    Abstract: An energy storage cell, or a plurality of energy storage cells assembled into an apparatus, are self-orienting relative to one or more adjacent energy storage cells. The energy storage cells are capable of sensing their polarity orientation of at least one other energy storage cell and self-orienting its own polarity responsive thereto. Thus, a method for self-orienting a subject energy storage cell includes: sensing the polarity of an adjacent energy storage cell; and setting the polarity of the subject energy storage cell responsive to the sensed polarity if the polarities of the adjacent energy storage cell and the subject energy storage cell are incompatible.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: August 4, 2015
    Assignee: Lockheed Martin Corporation
    Inventors: Gregory G Romas, Jacob M Stultz, Thomas E Byrd
  • Patent number: 8966019
    Abstract: A method, apparatus, and computer program product for running software on an adapter. In response to a connection of a hardware interface for the adapter with a current host computer, a processor unit in the adapter determines whether a set of protocols for communicating with the current host computer to access resources is present on the adapter. In response to the set of protocols being absent on the adapter, the processor unit obtains the set of protocols from the current host computer. The processor unit identifies a set of available resources in the current host computer for use by the adapter using the set of protocols. The processor unit runs software stored on a set of storage devices in the adapter using the set of available resources identified for use by the adapter.
    Type: Grant
    Filed: June 24, 2010
    Date of Patent: February 24, 2015
    Assignee: International Business Machines Corporation
    Inventors: Diane G. Flemming, William A. Maron, Mysore S. Srinivas, Basu Vaidyanathan
  • Patent number: 8723372
    Abstract: A method of inducing a high efficiency conductive state at room temperature within a conductive mass (1) by injecting a complex modulated carrier signal (7) into one or more injection points (2,3) whereby the carrier signal and the subharmonic modulation frequencies (4,5,6) which are imbedded in the modulation of the carrier signal are tuned to the mass lattice qualities of the material. The amplitude and phase relationship of each individual subharmonic frequencies (4,5,6) are respectively tuned to the mass lattice qualities of the conductive mass (1). This method of excitation, with precise matching of subharmonic modulation frequencies, and with a precise matching concordant harmonic of the carrier frequency, creates an observed ionic excitation throughout the conductive mass (1) at room temperature.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: May 13, 2014
    Inventor: Larry A. Park
  • Patent number: 8605399
    Abstract: A load driving device according to an aspect of the present invention may includes an output transistor and a load connected in series between first and second power supply lines, a protection transistor connected between a gate of the output transistor and the second power supply line, the protection transistor turning on the output transistor when a polarity of a power supply connected between the first and second power supply lines is reversed, and a resistor arranged on a line, which supplies a voltage to a back gate of the protection transistor.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: December 10, 2013
    Assignee: Renesas Electronics Corporation
    Inventor: Akihiro Nakahara
  • Patent number: 8390150
    Abstract: A field device interface module includes a connector, a plurality of terminals, a protocol interface module, a controller and a power supply module. The connector is configured to operably couple to a computer. The terminals are operably coupleable to a field device. The protocol interface module is coupled to the plurality of terminals and configured to generate signals in accordance with a process communication protocol. A power supply module is coupled to the plurality of terminals. The controller is coupled to the protocol interface module and to the power supply module and is configured to measure a voltage across the plurality of terminals and selectively cause the power supply module to provide power to the field device.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: March 5, 2013
    Assignee: Fisher-Rosemount Systems, Inc.
    Inventors: Daniel E. Vande Vusse, Alden C. Russell, III, Douglas W. Arntson
  • Patent number: 7977822
    Abstract: Power control circuitry for controlling connection of a voltage source to a switched power rail powering an associated circuit is provided. A plurality of switch blocks are connected in parallel between the switched power rail and the voltage source, each switch block being controlled by an enable signal provided by a switch controller. The switch controller performs a turn-on sequence providing a series of enable signal patterns to the switch blocks. The switch controller applies a time varying generation operation to at least one sequence stage of a predetermined turn-on sequence to produce a corresponding enable signal pattern for that sequence stage. When the turn-on sequence is later repeated, the enable signal pattern produced for at least one of the sequence stages differs from the enable signal pattern previously produced for that sequence stage.
    Type: Grant
    Filed: November 5, 2007
    Date of Patent: July 12, 2011
    Assignee: ARM Limited
    Inventors: David Walter Flynn, Sachin Satish Idgunji
  • Patent number: 7924540
    Abstract: A main transistor and a reverse current prevention transistor are provided in series between an input terminal and an output terminal. An input diode is provided between a connection point of the reverse current prevention transistor and the main transistor and a reference voltage terminal in such a direction that the anode becomes the reference voltage terminal side. A control unit controls the gate voltage of the main transistor according to a DC voltage. The reverse current prevention transistor is arranged in such a direction that the anode of its body diode becomes the input terminal side. The reverse current prevention transistor is biased to be turned on in a normal state that the input terminal becomes high potential and the reference voltage terminal becomes low potential.
    Type: Grant
    Filed: October 15, 2008
    Date of Patent: April 12, 2011
    Assignee: Rohm Co., Ltd.
    Inventor: Yoichi Tamegai
  • Patent number: 7915766
    Abstract: The life of load tap changer contacts is monitored by detecting an arcing event; identifying arcing surfaces involved in the arcing event; calculating a per-unit loss of life for the identified arcing surfaces as a result of the arcing event; updating estimates of cumulative erosion for the arcing surfaces; comparing the updated estimates of cumulative erosion to a first threshold value; and signaling for action when at least one of the updated estimates of cumulative erosion exceeds the first threshold value.
    Type: Grant
    Filed: October 23, 2008
    Date of Patent: March 29, 2011
    Assignee: Cooper Technologies Company
    Inventors: Augusto D. Hernandez, Augusto D. Hernandez, Jr., legal representative, Fred J. Rapant, Richard J. Kaluzny, Donald A. Down
  • Patent number: 7854832
    Abstract: An input terminal is electrically connected to a contact point. An anti-corrosion current supplying section is operable to supply an anti-corrosion current to the contact point through the input terminal so as to remove corrosion in the contact point. A series resistor is electrically interposed between the input terminal of the signal processing circuit and the contact point. The anti-corrosion current is supplied to the contact point through the series resistor.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: December 21, 2010
    Assignee: Fujitsu Ten Limited
    Inventors: Kazuhiro Komatsu, Keisuke Kido, Kouji Oonishi
  • Publication number: 20090072630
    Abstract: A semiconductor device controls an electrostatic actuator having first and second electrodes. A voltage generation unit generates different types of voltages applied to the first and second electrodes. A control unit controls voltages generated by the voltage generation unit to be applied to the first and second electrodes. A capacitance detection unit detects a voltage of the first or second electrode to detect a capacitance between the first and second electrodes. The control unit applies a first voltage between the first and second electrodes and then a second voltage smaller than the first voltage between the first and second electrodes. Thereafter, the control unit switches one of the first electrode or the second electrode to a high impedance state and then changes a voltage applied to the other. The capacitance detection unit detects the amount of change in voltage of the first or second electrode to detect a capacitance between the first and second electrodes.
    Type: Application
    Filed: September 8, 2008
    Publication date: March 19, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Takayuki Miyazaki
  • Patent number: 7504750
    Abstract: 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 circuit, and first means for turning-off with a delay the switch in the presence of a reverse polarity.
    Type: Grant
    Filed: April 1, 2004
    Date of Patent: March 17, 2009
    Assignee: STMicroelectronics S.A.
    Inventors: Philippe Bienvenu, Sandra Mattei
  • Patent number: 7348689
    Abstract: 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 output and that receives a DC signal of voltage +Vs, wherein switching of the first and second switches produces voltage pulses of +Vs, 0V and ?Vs at the output; the method comprising the steps of: receiving a voltage demand signal; and generating the first and second switching signals according to a rule that the first switching signal shall have a single pulse of a first determined width and the second switching signal shall remain in one state, the combination of the first and second switching signals producing an average voltage at the output being substantially equal to the demanded voltage.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: March 25, 2008
    Assignee: BAE Systems PLC
    Inventor: Andrew M G Westcott
  • Patent number: 7119459
    Abstract: 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 to ensure optimum operation of the load and optimum usage of the energy in the battery. The microchip can control the connection of the load to the battery in different ways according to the manner of operation of the signal switch.
    Type: Grant
    Filed: June 13, 2001
    Date of Patent: October 10, 2006
    Assignee: Azoteq (PTY) LTD
    Inventors: Frederick Johannes Bruwer, Brandt Aucamp, Abraham Carl Greyling
  • Patent number: 6946752
    Abstract: 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 current to flow when the DC power source develops a short circuit momentarily. A current detecting unit detects reverse current from the capacitor in an input power supply line, and a current interrupting unit interrupts a current line connecting the load with the DC power source. When reverse current flow is detected, the current line is interrupted by the current detecting unit and the current interrupting unit. The reverse current from the capacitor is held to a minimum value in the input power stabilizing circuit.
    Type: Grant
    Filed: April 11, 2002
    Date of Patent: September 20, 2005
    Assignee: NEC Communication Systems, Ltd.
    Inventor: Hiromitsu Tahara
  • Patent number: 6930409
    Abstract: 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 that reverses polarity when switched, while a second pair of leads connect to the other pair of contacts. A switch controller employs a plurality of coils in electrical communication with the two pairs of leads. The coils are arranged and configured so that, when the two pairs of leads are connected to the respective power sources, the coils cause an actuator to move the switch automatically into the correct polarity state regardless of the connections of the leads. The invention is described as a battery jumper cable and to automatically connect like terminals of a pair of batteries. The invention encompasses the method of this device.
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: August 16, 2005
    Inventor: Jerry R. Smith
  • Publication number: 20040222703
    Abstract: 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 circuit, and first means for turning-off with a delay the switch in the presence of a reverse polarity.
    Type: Application
    Filed: April 1, 2004
    Publication date: November 11, 2004
    Applicant: STMicroelectronics SA
    Inventors: Philippe Bienvenu, Sandra Mattei
  • Patent number: 6661122
    Abstract: 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 time a time-out period of a selected number of clock periods. In response to the step of sensing, if the state of the output of the power supply is inactive through the timeout period, then the first logic level of the control signal is generated to activate the power supply for use in powering operations of an associated device. After completion of these operations, the second logic level of the control signal is generated to deactivate the power supply. If however, the state of the output of the power supply is active during the time-out period, then the first logic level of the control signal is maintained to power operations of the associated device.
    Type: Grant
    Filed: December 7, 2001
    Date of Patent: December 9, 2003
    Assignee: Cirrus Logic, Inc.
    Inventor: Jeffrey Dunnihoo
  • Patent number: 6466627
    Abstract: 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 transformer. First and second transistors are connected to a primary winding of the transformer. A voltage output from an external power source is input to the primary winding of the transformer when at least one of the first and second transistors is conductive so that a pulse voltage signal is input to the transformer. A booster power supply circuit is located between the external power source and a middle point of the primary winding of the transformer. The booster power supply circuit superimposes a boost voltage onto the voltage input to the primary winding of the transformer so that a high-frequency component of the pulse voltage signal input to the primary winding of the transformer is enhanced.
    Type: Grant
    Filed: February 5, 1999
    Date of Patent: October 15, 2002
    Assignee: Fujitsu Limited
    Inventor: Isamu Kuwana
  • Patent number: 6166451
    Abstract: 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 firing current necessary to detonate a squib device (32) and inflate the airbag. The squib driver circuit includes a rectifier (42) with its first and second inputs interchangeably connected to the two-wire bus. The rectifier circuit converts the voltage orientation on the first and second conductors to a positive potential on a first output conductor and a negative or ground potential on a second output conductor. The interchangeability of the first and second inputs of the rectifier to the two-wire bus makes the connection arbitrary and fail-safe.
    Type: Grant
    Filed: January 14, 1999
    Date of Patent: December 26, 2000
    Assignee: Motorola, Inc.
    Inventor: John M. Pigott
  • Patent number: 6040969
    Abstract: 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 circuit controls switching circuits in accordance with the determination of whether the supply system is properly wired. The sensing circuit activates a first switching circuit to form a short circuit between the neutral and ground conductors of the power filter circuit when it is determined that the supply system circuit is properly wired. If any wiring fault conditions, including a reverse polarity wiring, is detected by the sensing circuit, the first switch is not activated and the short circuit is not formed between the neutral and ground conductors.
    Type: Grant
    Filed: August 4, 1998
    Date of Patent: March 21, 2000
    Assignee: Electronic Systems Protection, Inc.
    Inventors: Peter G. Winch, Richard Billingsley
  • Patent number: 6008733
    Abstract: 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 superposition circuit (50) for applying a direct-current voltage and outputs an identification number signal from the power superposition circuit (50) to the communication line (20). The control unit further has a polarity select circuit (60) having a negative-polarity resistance characteristic that current increasingly flows as an applied voltage is lowered, and a voltage discriminating circuit (70) for detecting the terminal voltage of the polarity select circuit (60). When detecting the voltage of the communication line (20), the control unit determines whether its own control unit is a master unit or a slave unit according to output signals from the voltage discriminating circuit (70) and a polarity discriminating circuit (3C).
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: December 28, 1999
    Assignee: Daikin Industries, Ltd.
    Inventors: Takashi Okano, Kouji Kamafusa, Hisatoshi Kawakami
  • Patent number: 5828309
    Abstract: 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 of a three-phase alternating power source, and a second pulse having a pulse width corresponding to a second phase difference between a second pair of two phases of the three-phase alternating power source which is different from the first pair of two phases, and a microcomputer for detecting a third phase difference between the first pulse and the second pulse to judge whether the third phase difference is in a predetermined range, and detecting the miswiring if the third phase difference is judged to be out of the predetermined range.
    Type: Grant
    Filed: April 2, 1996
    Date of Patent: October 27, 1998
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Masayuki Kumakura, Eiji Oohashi
  • Patent number: 5821643
    Abstract: A synchronization control scheme that provides a drive signal to a plurality of switching circuits and method of operation therefor.
    Type: Grant
    Filed: June 10, 1997
    Date of Patent: October 13, 1998
    Assignee: Lucent Technologies Inc.
    Inventor: Yehoshua Mandelcorn
  • Patent number: 5818130
    Abstract: 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 having in each case a high side driver and a low side driver, it is proposed to define on the output-side voltage axis between the positive supply voltage (+VB) and the negative pole or ground an upper and a lower detection window which sense the load configuration, each at a distance from the working points (which remain in a steady state) of each output stage driver, such that when a change in load configuration occurs, the potential of the output connection, to which the load configuration detection stage is connected, passes only briefly through these detection windows, and such that the transient signal changes which result therefrom in each window region are used for appropriately polarized switchover to the respective correct output stage circuit section b
    Type: Grant
    Filed: July 24, 1996
    Date of Patent: October 6, 1998
    Assignee: Gebhard Balluff GmbH & Co.
    Inventors: Ernst Gass, Sorin Fericean, Bernd Fingerle, Heinz Kammerer
  • Patent number: 5682067
    Abstract: 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 connected to the second electrode. A diode and a first capacitor are connected in series across the first and second electrodes so that the cathode of the diode is connected to the first electrode. A second capacitor and a switching device are also connected in series across the first and second electrodes. A second inductor is connected between the switching device and the anode of the diode.
    Type: Grant
    Filed: June 21, 1996
    Date of Patent: October 28, 1997
    Assignee: Sierra Applied Sciences, Inc.
    Inventors: Barry W. Manley, Keith H. Billings
  • Patent number: 5646463
    Abstract: 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 timing circuit is operative to supply a common synchronizing signal to all the polarity switching circuits.
    Type: Grant
    Filed: August 4, 1995
    Date of Patent: July 8, 1997
    Assignee: Lucent Technologies Inc.
    Inventor: Yehoshua Mandelcorn
  • Patent number: 5646462
    Abstract: 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 voltage is substituted for the AC voltage applied to the load should the voltage polarity processing circuitry in the power plant fail.
    Type: Grant
    Filed: August 3, 1995
    Date of Patent: July 8, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: Timothy M. Cortes, Robert John Kakalec, Keith C. Schmid
  • Patent number: 5440180
    Abstract: 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 rotate the sequence in which the individual phase currents are interrupted. By alternately making the last pulse positive or negative the polarity of the interrupted current alternates to further promote even contact wear.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: August 8, 1995
    Assignee: Eaton Corporation
    Inventors: Birch L. DeVault, Rick A. Hurley
  • Patent number: 5045670
    Abstract: 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 to preselected parameters for conducting the welding operation. Also disclosed are a method for preventing transistor failure due to loads which tend to cause a very large instantaneous current flow and an apparatus for protecting the driver circuit and the remaining output transistors in the event that one of the output transistors should suffer a collector-to-base short. The welding station also describes a method of operating the cooling fan at a speed commensurate with the cooling requirements and periodically reversing the voltage to the cooling fan so as to extend the operating lifetime of the fan brushes.
    Type: Grant
    Filed: November 3, 1989
    Date of Patent: September 3, 1991
    Inventor: Malcolm T. Gilliland
  • Patent number: 4906861
    Abstract: 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 invention includes a pair of switching units connected between the load (magnet) and a current source. These switching units each have a pair of superconductor members and a mechanism for selectively producing in the switching units either a substantial electrical resistance or no resistance. Through the use of a control logic, the level of resistance of the switching units can be changed to effect the direction of current flow. In the case of the superconductor magnet, both switch units can be simultaneously made to have substantially zero resistance, and their interconnection forms the persistent switch for the superconducting magnet.
    Type: Grant
    Filed: September 30, 1988
    Date of Patent: March 6, 1990
    Assignee: Cryomagnetics, Inc.
    Inventors: Apurba Roy, David M. Coffey
  • Patent number: 4868504
    Abstract: 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 transmits a nonsinusoidal alternating magnetic field into the soil, rocks or metal objects to be located. Distortion of the magnetic field caused by the presence of these materials in the field induces corresponding voltage waveforms in a receive coil. The induced waveform is analyzed in order to deduce certain electrical properties of the materials, or in order to distinguish buried metal objects from the soil in which they are buried. The circuit which energizes the transmit coil returns energy from the collapse of the magnetic field to the power supply, minimizing the power consumption of the apparatus.
    Type: Grant
    Filed: February 9, 1987
    Date of Patent: September 19, 1989
    Assignee: FLR, Inc.
    Inventor: David E. Johnson
  • Patent number: 4739461
    Abstract: 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 coils. These voltages are rectified and smoothed in mutually opposite polarities, and the output voltages are obtained by summing the rectified and smoothed voltages.
    Type: Grant
    Filed: September 3, 1986
    Date of Patent: April 19, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shunichi Komatsu, Koji Suzuki
  • Patent number: 4682046
    Abstract: 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 the carriers includes connector means for coupling each carrier to the positive source of power when the carrier is in a first position, and for coupling each carrier to the negative source of power when the carrier is in a second position. In a preferred embodiment of the invention means are provided for preventing either intentional or accidental movement of the carriers from one of the first and second positions to the other position during operation of the carriers. Preferably a bridging connector is provided for coupling the circuitry of adjacent carriers to each other when the carriers are in a first position coupled to the positive source of power.
    Type: Grant
    Filed: August 1, 1986
    Date of Patent: July 21, 1987
    Assignee: Applied Energy Systems, Inc.
    Inventor: David H. Buerkel
  • Patent number: 4583091
    Abstract: 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, a device for detecting the polarity of the power source voltage, a device for generating binary pulses in response to the output of the polarity detecting device, and a control element provided in the signal line. The control element is made conductive in accordance with the binary pulses constituting the data signals.
    Type: Grant
    Filed: October 25, 1982
    Date of Patent: April 15, 1986
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Hiroaki Sugiura, Yoshihito Mino
  • Patent number: 4425512
    Abstract: 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 and accurately stopping the supply of current to the terminal device in the non-communicating condition.
    Type: Grant
    Filed: April 9, 1982
    Date of Patent: January 10, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Keiji Tomooka, Makoto Ogawa, Hideo Ishiguro
  • Patent number: 4185561
    Abstract: 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 train motion and automatically conform the polarity of the next track block upon which the train will enter if the next block is of an opposite polarity from the prior block section from which the train has left.
    Type: Grant
    Filed: July 22, 1977
    Date of Patent: January 29, 1980
    Inventor: Joseph Reymann
  • Patent number: 4086624
    Abstract: 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 while the other is reverse biased, and the same polarity will appear at the output regardless of the polarity of the input. The low voltage at the output is established by the voltage drop across the transistors of the pair which are conducting. The circuit is particularly suited for converting telephone line current to a voltage output of 1.5 volts or less.
    Type: Grant
    Filed: June 15, 1977
    Date of Patent: April 25, 1978
    Assignee: Bell Telephone Laboratories Incorporated
    Inventor: Phillip Edward Fraley
  • Patent number: 4065807
    Abstract: 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 polarity. The other transistor Q1 of the multivibrator is also connected across the input port. The multivibrator causes the switching transistors Q2 and Q3 to be alternately conducting and nonconducting. A pair of capacitors C3 and C4 and unidirectional diodes D4, D5, and D6 are connected to the switching transistors Q2 and Q3 in such a manner that only one capacitor C3 is charged in one direction during conduction of the common transistor Q2, and that this one capacitor C3 discharges through the other capacitor C4 to charge the latter and produce an output voltage of the other polarity across it and an output port only during conduction of the other switching transistor Q3.
    Type: Grant
    Filed: February 7, 1977
    Date of Patent: December 27, 1977
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventor: Neale A. Zellmer
  • Patent number: RE39446
    Abstract: 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 circuit controls switching circuits in accordance with the determination of whether the supply system is properly wired. The sensing circuit activates a first switching circuit to form a short circuit between the neutral and ground conductors of the power filter circuit when it is determined that the supply system circuit is properly wired. If any wiring fault conditions, including a reverse polarity wiring, is detected by the sensing circuit, the first switch is not activated and the short circuit is not formed between the neutral and ground conductors.
    Type: Grant
    Filed: March 21, 2002
    Date of Patent: December 26, 2006
    Assignee: Electronic Systems Protection, Inc.
    Inventors: Peter G. Winch, Richard Billingsley