Reverse Energy Responsive (e.g., Directional) Patents (Class 361/82)
  • Patent number: 10439607
    Abstract: A circuit breaker device includes at least one circuit breaker component with an input terminal (18), an output terminal (22) and with a driving terminal (26). The circuit breaker component (14) is in a conductor state when driving voltage is applied to the driving terminal (26) and is in a diode state when driving voltage is not applied thereto, resulting in a component blocked state when the input terminal (18) is at a higher potential than the output terminal (22). A driving unit (30) provides a driving voltage to the driving terminal. An auxiliary driving unit (38) provides an auxiliary driving voltage to the driving terminal (26). The auxiliary driving unit (38) generates the auxiliary driving voltage based on a voltage drop between the input terminal and the output terminal in the diode state and the circuit breaker component output terminal is at a higher potential than the input terminal.
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: October 8, 2019
    Assignee: Eberspächer Controls Landau GmbH & Co. KG
    Inventors: Steffen Wandres, Christian Knopf
  • Patent number: 10027107
    Abstract: A host electronic device may be coupled to an accessory electronic device. The host device and the accessory device may be connected via power supply lines and user data lines. If the host and accessory devices are improperly connected or if the accessory device is exposed to an incorrect voltage environment, the internal circuitry on the accessory device can be damaged. The accessory device may therefore include a reverse voltage protection circuit that can help prevent a large amount of current from inadvertently flowing into the accessory device. The protection circuit may include a low-side-enabled reverse current protection switch coupled between the external and internal ground terminals and also a single low-drop switch coupled to each of the user data lines. The low-drop switch will be activated whenever the voltage at the external ground terminal exceeds the voltage at the data line to help deactivate low-side-enabled reverse current protection switch.
    Type: Grant
    Filed: April 5, 2016
    Date of Patent: July 17, 2018
    Assignee: Apple Inc.
    Inventors: Robert M. Proie, Salvatore Reddiconto
  • Patent number: 9385529
    Abstract: Power supply current is supplied to a plurality of electric loads, the power supply current being generated by a DC power supply, flowing in and branching from a shared power supply switching device and then flowing in reverse connection protection devices that are a field-effect transistor and connected in series to the electric loads, respectively. The reverse connection protection devices are connected in a polarity such that the power supply current flows in the forward direction of parasitic diodes generated between the source terminal S and the drain terminal D of the field-effect transistor. When the current in the field-effect transistor is less than a predetermined value, a gate control circuit interrupts the gate voltage of the reverse connection protection device to cause the reverse connection protection device to open.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: July 5, 2016
    Assignee: Mitsubishi Electric Coporation
    Inventors: Shozo Kanzaki, Koji Hashimoto, Tomohiro Kimura
  • Patent number: 9270250
    Abstract: An impedance adjustment apparatus of the invention performs impedance matching using characteristic parameters, even where a high frequency power source of variable frequencies is used. The apparatus is applicable to a power supply system using a high frequency power source of variable frequencies. Characteristic parameters obtained by targeting a portion of combinations of position information (C) of a variable capacitor and output frequency information (F) of the power source are stored in a memory. A T-parameter acquisition unit acquires characteristic parameters corresponding to (Cnow, Fnow) at the current time. An output reflection coefficient calculation unit calculates a reflection coefficient of an output end. A target information specifying unit, based on the above information and a target input reflection coefficient, specifies target combination information in which a reflection coefficient of an output end approaches the target input reflection coefficient.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: February 23, 2016
    Assignee: DAIHEN Corporation
    Inventors: Takashi Shimomoto, Koji Itadani, Masakatsu Mito
  • Patent number: 9252669
    Abstract: The present invention provides an Alternating Current/Direct Current (AC/DC) converter employing measures not only against residual voltage but also to reduce power consumption. The AC/DC converter receives an Alternating Current (AC) voltage through a concentric plug and converts the AC voltage into a Direct Current (DC) voltage. A discharge path is disposed on a path from a discharge terminal to a ground terminal. A detection circuit compares a wave detection voltage with a predetermined threshold voltage, and enables the discharge path to be turned on when the wave detection voltage is continuously lower than the threshold voltage for a predetermined detection time.
    Type: Grant
    Filed: July 23, 2012
    Date of Patent: February 2, 2016
    Assignee: ROHM CO., LTD.
    Inventors: Satoru Nate, Hiroshi Hayashi
  • Patent number: 9110110
    Abstract: The present invention relates to a bidirectional 3 phase power meter for compensating reverse load flow and a method for metering thereby. According to the present invention, there is provided a bidirectional 3 phase power meter for compensating reverse load flow which allows calculating power receiving and power transmitting apparent power and power factor using the detected voltage/current and a method for metering thereby.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: August 18, 2015
    Assignee: KOREA ELECTRIC POWER CORPORATION
    Inventor: Dong-Yeol Shin
  • Patent number: 9057751
    Abstract: A ground fault detection circuit for detecting ground faults in electrical subsea conductor lines including a first electrical conductor line, a second electrical conductor line, a first ground fault detection line, and a second ground fault detection line. The ground fault detection circuit further includes a first resistor operatively connected to a voltage source and the first ground fault detection line, a second resistor operatively connected to the voltage source and the second ground fault detection line, and a voltage detection device configured to detect the voltage at an output end of the first resistor to determine the presence of a ground fault in at least one of the first and second conductor lines.
    Type: Grant
    Filed: April 26, 2011
    Date of Patent: June 16, 2015
    Assignee: Schlumberger Technology Corporation
    Inventors: Ronald Spencer, Kirtikumar Patel
  • Publication number: 20140247528
    Abstract: A method and device are disclosed for determining the direction of current flowing through a circuit breaker. An embodiment includes obtaining a sample value of current flowing through the circuit breaker and a differential value of current; obtaining a sample value of voltage at the circuit breaker; on the basis of a relationship between voltage and current in an equivalent circuit in which the circuit breaker lies at the present time and at a previous time, obtaining an equivalent resistance and an equivalent inductance in the equivalent circuit; if the equivalent resistance and equivalent inductance are both greater than zero, determining that the direction of current flowing through the circuit breaker is the same as the current reference direction, and if the equivalent resistance and equivalent inductance are both less than zero, determining that the direction of current flowing through the circuit breaker is opposite to the current reference direction.
    Type: Application
    Filed: February 27, 2014
    Publication date: September 4, 2014
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Wei Gang CHEN, Feng DU, Yue ZHUO
  • Patent number: 8780513
    Abstract: A reverse battery protection circuit for an actuator or the like. The circuit includes at least a first transistor and a second transistor which is coupled to both the first transistor and a voltage supply in a manner wherein the second transistor is adapted to turn the first transistor off in the event of an interruption in the voltage supply.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: July 15, 2014
    Assignee: CTS Corporation
    Inventor: Kristopher L. Desrochers
  • Patent number: 8680708
    Abstract: In response to turning-on of a lock-type power switch, an initial controller outputs a first voltage for a first period and a gate is turned on for the period via a first driver responsive to the first voltage, then DC power is supplied to a main circuit. During the period, a control processor causes a voltage output section to start outputting a second voltage so that the gate is turned on via a second driver to continue the DC power supply. When no event has been generated for a second period, the second voltage from the voltage output section is stopped to turn off the gate, thus the power supply to the main circuit is shut off. Once a power from outside is switched from OFF to ON while the power switch kept ON, the power supply to the main circuit is resumed via the controller and first driver.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: March 25, 2014
    Assignee: Yamaha Corporation
    Inventor: Tamotsu Shirai
  • Patent number: 8675326
    Abstract: A bidirectional switch device, has: a bidirectional switch having a HEMT; and a control circuit which, during a first condition, applies a first voltage lower than a threshold voltage across a gate and one terminal among a source and a drain of the HEMT to turn off a first current path from the other terminal among the source and the drain to the one terminal, and during a second condition, applies a second voltage lower than the threshold voltage across the other terminal and the gate to turn off a second current path from the one terminal to the other terminal, and further during a third condition, applies a third voltage higher than the threshold voltage across the source and the gate and across the drain and the gate of the HEMT to turn on the first and second current paths.
    Type: Grant
    Filed: February 8, 2012
    Date of Patent: March 18, 2014
    Assignee: Fujitsu Semiconductor Limited
    Inventor: Ken Shono
  • Patent number: 8553382
    Abstract: A circuit protection system for a power panel is disclosed. The circuit protection system includes a transistor connected in a channel of a power panel, the transistor connected between return connections of a load and a return path, and the power panel including a plurality of channels connected to the load. The circuit protection system also includes control circuitry electrically connected in parallel with the transistor, the control circuitry configured to selectively activate the transistor to allow current to pass through the transistor based on an observed voltage across the transistor.
    Type: Grant
    Filed: October 9, 2009
    Date of Patent: October 8, 2013
    Assignee: ADC Telecommunications, Inc.
    Inventor: Joseph C. Coffey
  • Patent number: 8547671
    Abstract: The electronic device for protecting against a polarity reversal of a DC power supply voltage comprises, produced within one and the same integrated circuit, an N-channel main transistor (TP) mounted on the line of expected positive polarity of the power supply voltage and command means (MCM) for the main transistor comprising a charging pump circuit (CP), associated with a dynamic biasing circuit (MCTRL) for the substrate regions of active components connected to the main transistor.
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: October 1, 2013
    Assignee: STMicroelectronics (Rousset) SAS
    Inventor: Antoine Pavlin
  • Patent number: 8494178
    Abstract: Methods and techniques to implement a digital signal processor for avoidance of audio feedback are disclosed, in particular, audio signal processing systems that reduce the requirement for physical segregation of sound acquisition and diffusion zones. In a more general aspect, the components and techniques described herein provide a for a sound space and sound processing equipment such that sound travelling electronically in a loop through the sound processing equipment that is output into a physical sound diffusion zone, received at the input to the sound processing equipment, and then re-amplified, etc. is attenuated over that loop by frequency modification. The frequency modification is such that, at least for some signals, on each pass through the loop, the sound processing equipment will attenuate or amplify individual sub-bands of the frequency spectrum of the audio signal that is received at the input of the sound processing equipment.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: July 23, 2013
    Assignee: Pixar
    Inventors: Loren Carpenter, Lanny Smoot, Alex Stahl
  • Publication number: 20120206110
    Abstract: A reverse current prevention circuit, connected to an input terminal, an output terminal, and a driver transistor, including a current detection circuit to detect a current flowing through the driver transistor, and convert the detected current into a detection voltage; a proportional voltage generator to generate a proportional voltage proportional to a difference voltage between an input voltage at the input terminal and an output voltage at the output terminal; an inversely-proportional voltage generator to generate an inversely-proportional voltage inversely proportional to the difference voltage between the input voltage and the output voltage; and a comparison circuit to compares the generated voltages. When the detection voltage, the proportional voltage, and the inversely-proportional voltage are equal, the comparison circuit determines that the indication of the reverse current is detected and prevents the reverse current flowing from the output terminal to the input terminal.
    Type: Application
    Filed: January 26, 2012
    Publication date: August 16, 2012
    Applicant: RICOH COMPANY, LTD.
    Inventor: Junji NISHIDA
  • Patent number: 8222860
    Abstract: A power transmission control device included in a contactless power transmission system in which power is transmitted from a power transmission device to a power receiving device by electromagnetically coupling a primary coil and a secondary coil and the power is supplied to a load of the power receiving device, includes a controller controlling the power transmission control device, and a load condition detection circuit detecting a load condition on a power receiving side. The controller determines the load condition on the power receiving side based on threshold information received from the power receiving device and load condition detection information from the load condition detection circuit.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: July 17, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Takahiro Kamijo, Yoichiro Kondo, Kota Onishi, Masayuki Kamiyama, Nobutaka Shiozaki
  • Patent number: 8203234
    Abstract: A power safety system includes a first MOS, a second MOS, a switch and a body controller. The first MOS is connected between a power input and a power output. The second MOSFET is connected between the power output and a charging output. The switch has an end connected to the body of the first MOS, and the opposite end switched between the source and the drain of the first MOS. A body controller controls the switch according to the voltage at the power input and the voltage at the power output, to connect the body of the first MOS to the source or the drain of the first MOS. By switching the switch, the first MOS will have a parasitic diode effective to prevent a reverse current from the power output to the power input.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: June 19, 2012
    Assignee: Richtek Technology Corp.
    Inventors: Li-Wei Lee, Nien-Hui Kung, Kwan-Jen Chu, Chun-Tsung Chen
  • Patent number: 8169169
    Abstract: A door operator for controlling operation of a door, the door operator having a motor to open the door against a spring force, the door operator further comprising a door position sensor for transmitting a signal indicative of door position; and among other things, calculates a door moment of inertia based on a net torque and the time for the door to reach a predetermined angle from the closed position. Also provided is a door operator that compares door speed to a desired door speed based on a door speed-position profile and generates a door speed error signal and minimizes the door speed error signal by adjusting the braking load resulting from charging a chargeable battery using the motor as a generator.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: May 1, 2012
    Inventors: Brian Hass, Eric Dube
  • Patent number: 8159165
    Abstract: A first semiconductor switching element connects to a high side of a motor and includes a diode whose cathode faces the high side. A second semiconductor switching element having a diode resides on a low side of the first semiconductor switching element. A third semiconductor switching element having a diode resides on a low side of the motor. A fourth semiconductor switching element is connected in parallel to the motor and configures a return current circuit that includes a return current element and causes a return current that arises when the first semiconductor switching element turns off to flow through the return current element. A control portion controls on-off states of the first to the fourth semiconductor switching elements and performs return current circuit failure detection based on a first monitor voltage that is an electric potential of a connecting point between the first semiconductor switching element and the motor.
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: April 17, 2012
    Assignee: Advics Co., Ltd
    Inventors: Isao Okamoto, Hiroyuki Matsumori
  • Patent number: 8134816
    Abstract: A high-frequency power supply system includes an anomaly detector 3 which detects an anomaly occurring in a circuit on the side of a load L as from an outputting end A of a high-frequency power source 1. The anomaly detector 3 includes a first detector 21 which detects a voltage value Vf of a high-frequency forward wave, a second detector 22 which detects a voltage value Vr of a high-frequency reflected wave, a reflection coefficient calculator 23 and a differentiator 24 which calculate a reflection coefficient differential value d?/dt from the forward wave voltage value Vf and the reflected wave voltage value Vr, and an anomaly determiner 25 which determines of an occurrence of an anomaly based on the reflection coefficient differential value d?/dt. When the anomaly detector 3 outputs an anomaly detection signal to the high-frequency power source 1, high-frequency power source 1 stops its power output operation.
    Type: Grant
    Filed: July 12, 2010
    Date of Patent: March 13, 2012
    Assignee: Daihen Corporation
    Inventors: Hiroyuki Kotani, Hirotaki Takei, Yoshifumi Ibuki, Hiroaki Oichi
  • Patent number: 8111041
    Abstract: A power reception device transmits authentication information (e.g., start code, manufacturer ID, product ID, rated power information, and resonance characteristic information) to a power transmission device before starting normal power transmission by a non-contact power transmission system. The power transmission device performs instrument authentication based on the received authentication information, and regulates the maximum transmission power is regulated to conform to a power-reception-device side rated power. The power transmission device then performs normal power transmission.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: February 7, 2012
    Assignees: Seiko Epson Corporation, Sony Ericsson Mobile Communications Japan, Inc.
    Inventors: Kota Onishi, Kentaro Yoda, Haruhiko Sogabe, Takahiro Kamijo, Kuniharu Suzuki, Hiroshi Kato, Katsuya Suzuki, Manabu Yamazaki
  • Patent number: 8054036
    Abstract: A power transmission device performs power-saving power transmission that transmits a small amount of power as compared with normal power transmission when the power transmission device has detected that a battery of a load has been fully charged so that the operation of a charge control device (charge control IC) of the load is maintained, thereby enabling recharging due to a charge management function of the charge control device. Since the load state of a power reception device increases when recharging has started, the power transmission device detects an increase in the load state and changes power transmission from power-saving power transmission to normal power transmission. When the power reception device has been removed during power-saving power transmission, the power transmission device detects that the power reception device has been removed, and stops continuous power transmission so that unnecessary power consumption does not occur.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: November 8, 2011
    Assignees: Seiko Epson Corporation, Sony Ericsson Mobile Communications Japan, Inc.
    Inventors: Kota Onishi, Kentaro Yoda, Takahiro Kamijo, Haruhiko Sogabe, Kuniharu Suzuki, Hiroshi Kato, Katsuya Suzuki, Manabu Yamazaki
  • Publication number: 20110227640
    Abstract: In a power supplying system that includes a plurality of power supply devices, each of which has a backflow prevention circuit at an output side thereof, and supplies power to a load device, a backflow prevention circuit is configured by using a hetero-junction FET (HEMT). A normally-on type GaNFET is used for the hetero-junction FET (HEMT), so that the backflow prevention circuit is further simplified.
    Type: Application
    Filed: March 16, 2011
    Publication date: September 22, 2011
    Applicant: SANKEN ELECTRIC CO., LTD.
    Inventor: YOICHI KYONO
  • Patent number: 8013475
    Abstract: An integrated circuit arrangement includes a semiconductor body having a substrate and at least one substrate terminal. At least one semiconductor component is integrated in the semiconductor body and is connected between a first supply terminal and a second supply terminal. The first supply potential is higher than the second supply potential during normal operation of the semiconductor component and the first supply potential is lower than the second supply potential during reverse voltage operation of the semiconductor component. A switch is adapted to couple at least one of the substrate terminals to the first supply terminal during reverse voltage operation and to the second supply terminal during normal operation.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: September 6, 2011
    Assignee: Infineon Technologies AG
    Inventors: Bernhard Wotruba, Andrea Logiudice, Andrea Scenini, Salvatore Pastorina
  • Patent number: 7995317
    Abstract: A module hot swap circuit includes a low voltage-drop rectifier adapted to receive either positive or negative voltages of different absolute values. The rectifier is coupled to a power manager that provides dual startup/shutdown voltage thresholds and inrush current limiting. A detector prevents reverse current flow allowing the module to hold up during input voltage drop-outs.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: August 9, 2011
    Assignee: Nortel Networks Limited
    Inventor: Charles E. Norman
  • Patent number: 7889472
    Abstract: A module hot swap circuit includes a low voltage-drop rectifier adapted to receive either positive or negative voltages of different absolute values. The rectifier is coupled to a power manager that provides dual startup/shutdown voltage thresholds and inrush current limiting. A detector prevents reverse current flow allowing the module to hold up during input voltage drop-outs.
    Type: Grant
    Filed: October 27, 2006
    Date of Patent: February 15, 2011
    Assignee: Nortel Networks Limited
    Inventor: Charles E. Norman
  • Patent number: 7796368
    Abstract: A high-frequency power supply system includes an anomaly detector 3 which detects an anomaly occurring in a circuit on the side of a load L as from an outputting end A of a high-frequency power source 1. The anomaly detector 3 includes a first detector 21 which detects a voltage value Vf of a high-frequency forward wave, a second detector 22 which detects a voltage value Vr of a high-frequency reflected wave, a reflection coefficient calculator 23 and a differentiator 24 which calculate a reflection coefficient differential value d?/dt from the forward wave voltage value Vf and the reflected wave voltage value Vr, and an anomaly determiner 25 which determines of an occurrence of an anomaly based on the reflection coefficient differential value d?/dt. When the anomaly detector 3 outputs an anomaly detection signal to the high-frequency power source 1, high-frequency power source 1 stops its power output operation.
    Type: Grant
    Filed: November 26, 2004
    Date of Patent: September 14, 2010
    Assignee: DAIHEN Corporation
    Inventors: Hiroyuki Kotani, Hirotaki Takei, Yoshifumi Ibuki, Hiroaki Oichi
  • Patent number: 7724487
    Abstract: An apparatus, system, and method are disclosed for preventing reverse current in a switching power supply. An electrical connector receives an input current from an electric source. An input current limiting module substantially prevents the input current from reaching a switching power supply when the input current is flowing in a reverse direction. A voltage reduction module reduces an input voltage of the switching power supply to a switching voltage when the input current is flowing in a forward direction. A switching module closes a switch in response to the voltage reduction module providing the switching voltage. The switch provides the input current a lower impedance path to the switching power supply than does the input current limiting module.
    Type: Grant
    Filed: July 10, 2008
    Date of Patent: May 25, 2010
    Assignee: International Business Machines Corporation
    Inventors: Cecil C. Dishman, Randhir S. Malik, Trung M. Nguyen
  • Patent number: 7719809
    Abstract: A method and apparatus for distributing electrical power is provided. In one embodiment, the apparatus includes: a semiconductor switch adapted to receive input power from a DC power source, adapted to distribute power to a DC/DC module, and adapted to receive a control signal, a charge storage device in operative communication with the semiconductor switch and a return path associated with the DC power source, and a reverse current monitoring logic in operative communication with the semiconductor switch. In this embodiment, the reverse current monitoring logic is adapted to detect reverse current flowing in the semiconductor switch and, in response to detecting the reverse current, is adapted to open the semiconductor switch. Several embodiments of a method of distributing electrical power to a DC load are also provided.
    Type: Grant
    Filed: September 12, 2006
    Date of Patent: May 18, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Paul A. Wirtzberger, Gary Williams, Rico Brooks
  • Patent number: 7692908
    Abstract: Circuits and methods for protecting polarity-sensitive components, such as light emitting diodes, electrolytic capacitors or integrated circuits, operating from a DC current source including a DC motor, an inductor or relay having a positive terminal and a negative terminal for receiving current from the current source, a protection diode connected parallel with the positive and negative terminals of the motor in a reverse bias configuration, at least one polarity-sensitive component connected in parallel with the protection diode and the DC motor, and a polarity protection transistor connected either between the nominally positive current source terminal and the positive motor terminal, or between the nominally negative current source terminal and the negative motor terminal.
    Type: Grant
    Filed: January 2, 2008
    Date of Patent: April 6, 2010
    Assignee: GLJ, LLC
    Inventors: Harry Chen, Eric Junkel
  • Patent number: 7679873
    Abstract: A method of preventing deep discharge of the battery pack (1?) with series-connected cell groups (2a, 2b) by polarity reversal of an individual weakest cell (3), includes a difference measurement step which is repeated over time for detecting an event indicative of a probable reversal of polarity in which the change over time of the voltage difference between two cell groups (2a, 2b) having identical numbers of cells is checked to determine if the change in the voltage difference has exceeded an amount corresponding to a difference threshold value which reliably distinguishes a fast polarity reversal of an individual weakest cell (3) in exactly one cell group (2a, 2b) from the slow fluctuation of the voltage difference between two cell groups (2a, 2b) during an ordinary discharge characteristic curve without polarity reversal of an individual weakest cell (3); and a battery pack (1?) and a battery-powered hand-held power tool (7) with a monitoring circuit (5?) for implementing the method.
    Type: Grant
    Filed: October 11, 2006
    Date of Patent: March 16, 2010
    Assignee: Hilti Aktiengesellschaft
    Inventor: Bernd Ziegler
  • Patent number: 7656624
    Abstract: An IC power protection circuit functions as a surge protection circuit and reverse connection protection circuit. The IC power protection circuit includes an error amplification circuit, positioned and integrated within an integrated circuit and a transistor positioned as a stand-alone element that is separate from the integrated circuit. The integrated circuit includes a sensor signal processing circuit that processes a signal of a sensor. A transistor protects the integrated circuit against a surge voltage from a battery terminal. A resistor is positioned between an output terminal of an error amplifier and a base terminal of the transistor to provide reverse connection protection. Another resistor is connected between a ground and a connection point between the above resistor and the output terminal to provide overvoltage protection for the integrated circuit. A starting resistor is connected between a collector and base of the transistor.
    Type: Grant
    Filed: January 24, 2007
    Date of Patent: February 2, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Matsumoto, Masamichi Yamada, Hiroshi Nakano, Keiji Hanzawa, Ryo Sato
  • Patent number: 7616421
    Abstract: An interface system may be used to connect an electrical device to an electrical bus. The interface system may include a first end and a second end in electrical communication with the first end. Where the interface system is used to connect an electrical device to an electrical bus, the first end may be connected to the electrical bus and the second end may be connected to the electrical device. The interface system may also include a reverse current blocking circuit configured to block current from flowing from the second end to the first end. Additionally, the interface system may include a discharge circuit electrically connected between the first end and the second end for discharging the blocked current.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: November 10, 2009
    Assignee: Caterpillar Inc.
    Inventor: Christopher D. Hickam
  • Patent number: 7599161
    Abstract: A method of operating a relay device, in an electrical circuit comprising first and second main circuit breakers, and a bus tie circuit breaker connecting the first and second main circuit breakers, the method comprising computing a first positive sequence current phasor for the first main circuit breaker and a second positive sequence current phasor for the second main circuit breaker computing a first positive sequence voltage phasor for the first main circuit breaker and a second positive sequence voltage phasor for the second main circuit breaker; computing a correction of the first positive sequence voltage and second positive sequence voltage to a line-to-neutral phase angle reference if there is any rotation in a potential transformer connection; determining a fault has occurred when a magnitude of a current through at least one of the first main circuit breaker or the second main circuit breaker exceeds a predetermined threshold; determining a phase angle difference by comparing the phase angle of the
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: October 6, 2009
    Assignee: General Electric Company
    Inventors: William Premerlani, Marcelo Valdes, Thomas Frederick Papallo, Jr., Gregory P. Lavoie, Radoslaw Narel
  • Patent number: 7570469
    Abstract: A dynamically configurable relay element configured to protect an electrical system, including a dynamically calculated relay operating quantity, a dynamically calculated relay pickup setting, a dynamically calculated time dial, a plurality of dynamically calculated variables that define a characteristic of the dynamically configurable relay element, and a dynamically calculated operating time, the dynamically calculated operating time based on the dynamically calculated relay operating quantity, the dynamically calculated relay pickup setting, the dynamically calculated time dial and the plurality of dynamically calculated variables. The relay element may be an inverse-time overcurrent element, an instantaneous overcurrent element, an adaptive pickup overcurrent element, and inverse-time overvoltage element, a voltage restrained overcurrent element, and an inverse-time undervoltage element.
    Type: Grant
    Filed: June 23, 2006
    Date of Patent: August 4, 2009
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Armando Guzman-Casillas, Luther S. Anderson
  • Patent number: 7542256
    Abstract: A method of operating a relay device, the method comprising the steps of: providing main circuit-breakers and a bus-tie-breaker connecting the main-circuit-breakers; defining a partial-differential-zone comprising a main circuit breaker and the bus-tie breaker; assigning a first value to the direction of the fault current flowing into the partial differential zone;—assigning a second value to the direction of the fault currents flowing out of the partial-differential-zone, wherein the first value is not equal to the second value;—comparing the values assigned to the fault currents; determining if the fault currents are flowing into the partial differential zone; and determining if at least two of the fault-currents is flowing in a different direction with respect to the partial-differential-zone wherein one of the fault currents is flowing into the partial-differential-zone and one of the fault currents is flowing out of the partial differential zone.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: June 2, 2009
    Assignee: General Electric Company
    Inventors: William Premerlani, Marcelo Valdes, Thomas Frederick Papallo, Jr., Radoslaw Narel, Gregory P. Lavoie
  • Patent number: 7535687
    Abstract: An alarm system sensor topology to reduce susceptibility to configuration errors and component failures includes a sensor configured to differentiate between system status conditions, including electrical power isolation for power polarity independence and for sustained sensor operation during power interruptions. A topological method for reducing fire sensor susceptibility to configuration errors and component failures includes configuring a sensor with capability to operate using electrical input power independent of power polarity, and providing capability to operate at least a part of the sensor circuitry for at least a specified time interval in the absence of applied electrical power.
    Type: Grant
    Filed: April 13, 2006
    Date of Patent: May 19, 2009
    Assignee: GE Security, Inc.
    Inventor: Hilario S. Costa
  • 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: 7463468
    Abstract: A circuit for protection against reverse circulation of current through the body diode of an FET power switching device switching a load, the power switching device having gate, source and drain terminals, wherein the power switching device is connected in series with the load, the load being connected to the source or drain terminal of the power switching device, the load being capable of providing a voltage across the source and drain terminals sufficient to cause the body diode to conduct, the power switching device being controlled by a driver output stage having a driver output stage body diode, the driver output stage having a substrate set at a substrate voltage level, the reverse circulation protection circuit comprising a circuit for changing the substrate voltage level of the driver output stage so that the voltage across the driver output stage body diode is less than a voltage sufficient to cause the driver output stage body diode to conduct, thereby allowing the power switching device to pass the
    Type: Grant
    Filed: May 12, 2004
    Date of Patent: December 9, 2008
    Assignee: International Rectifier Corporation
    Inventor: Vincent Thiery
  • Publication number: 20080285191
    Abstract: This patent specification describes a backflow prevention circuit which includes a first switch configured to conduct or to shut down a current path from an input terminal to an output terminal, a logic circuit configured to binarize an input voltage at the input terminal based on an output voltage at the output terminal and to output a binary signal and a shutdown circuit configured to cause the first switch to shut down independently of a switching control signal in accordance with the binary signal output from the logic circuit. The switching control signal performs a switching control of the first switch. The logic circuit outputs a shutdown signal to shut down independently of the switching control signal when the input voltage becomes smaller than the output voltage.
    Type: Application
    Filed: July 22, 2008
    Publication date: November 20, 2008
    Applicant: RICOH COMPANY, LTD.
    Inventor: Yuuichi UEDA
  • Publication number: 20080225454
    Abstract: An integrated circuit arrangement includes a semiconductor body having a substrate and at least one substrate terminal. At least one semiconductor component is integrated in the semiconductor body and is connected between a first supply terminal and a second supply terminal. The first supply potential is higher than the second supply potential during normal operation of the semiconductor component and the first supply potential is lower than the second supply potential during reverse voltage operation of the semiconductor component. A switch is adapted to couple at least one of the substrate terminals to the first supply terminal during reverse voltage operation and to the second supply terminal during normal operation.
    Type: Application
    Filed: December 27, 2007
    Publication date: September 18, 2008
    Inventors: Bernhard Wotruba, Andrea Logiudice
  • Patent number: 7394633
    Abstract: A reverse current protection circuit is provided to protect the internal circuit components of a switching power supply from being damaged by a reverse current discharging from an input filtering capacitor. The reverse current protection circuit according to a preferred embodiment includes a transistor switch coupled between an input terminal and the input filtering capacitor. The reverse current protection circuit also includes a surveillance device for monitoring the change of a voltage polarity across the current-conducting terminals of the transistor switch and generating a driving signal if the voltage polarity across the current-conducting terminals of the transistor switch is changed. The reverse current protection circuit also includes a signal coupler for coupling the driving signal to the control terminal of the transistor switch in order to turn off the transistor switch so as to block the discharging loop of the reverse current.
    Type: Grant
    Filed: May 9, 2005
    Date of Patent: July 1, 2008
    Assignees: Delta Electronics, Inc., Delta Electronics (Thailand) Public Company, Limited
    Inventors: Alongkorn Sasitornwannakul, Phichej Cheevanantachai, Weng Leong Hon
  • Patent number: 7391612
    Abstract: A fan sink that includes a dual impeller push-pull axial fan and a heat sink to cool a hot electronic device is presented. The axial fan has a hub motor, a first impeller that is radially proximate to the hub motor, and a second impeller that is radially distal to the hub motor, wherein the first impeller pushes air in a first direction and the second impeller pulls air in a second direction. The heat sink is oriented between the axial fan and the hot electronic device such that the hot electronic device, the heat sink, and the axial fan are axially oriented, wherein cool air is forced onto the heat sink by one impeller in the axial fan, and wherein heated air from the heat sink is removed by an other impeller in the axial fan.
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: June 24, 2008
    Assignee: International Business Machines Corporation
    Inventors: Jimmy Grant Foster, Sr., Michael Sean June, Albert Vincent Makley, Jason Aaron Matteson
  • Patent number: 7385815
    Abstract: A fan sink that includes a dual impeller push-pull axial fan and a heat sink to cool a hot electronic device is presented. The axial fan has a hub motor, a first impeller that is radially proximate to the hub motor, and a second impeller that is radially distal to the hub motor, wherein the first impeller pushes air in a first direction and the second impeller pulls air in a second direction. The heat sink is oriented between the axial fan and the hot electronic device such that the hot electronic device, the heat sink, and the axial fan are axially oriented, wherein cool air is forced onto the heat sink by one impeller in the axial fan, and wherein heated air from the heat sink is removed by an other impeller in the axial fan.
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: June 10, 2008
    Assignee: International Business Machines Corporation
    Inventors: Jimmy Grant Foster, Sr., Michael Sean June, Albert Vincent Makley, Jason Aaron Matteson
  • Patent number: 7385816
    Abstract: A fan sink that includes a dual impeller push-pull axial fan and a heat sink to cool a hot electronic device is presented. The axial fan has a hub motor, a first impeller that is radially proximate to the hub motor, and a second impeller that is radially distal to the hub motor, wherein the first impeller pushes air in a first direction and the second impeller pulls air in a second direction. The heat sink is oriented between the axial fan and the hot electronic device such that the hot electronic device, the heat sink, and the axial fan are axially oriented, wherein cool air is forced onto the heat sink by one impeller in the axial fan, and wherein heated air from the heat sink is removed by an other impeller in the axial fan.
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: June 10, 2008
    Assignee: International Business Machines Corporation
    Inventors: Jimmy Grant Foster, Sr., Michael Sean June, Albert Vincent Makley, Jason Aaron Matteson
  • Patent number: 7379282
    Abstract: The present invention is a method and system for providing improved isolation for power supplies while minimizing power dissipation. A body diode of a MOSFET may be utilized with a comparator circuit. The comparator circuit may detect current flow across the MOSFET and may turn the MOSFET on. This may shunt the diode with a low drain to source resistance limiting power dissipation across the diode to an amount of the drain to source current squared (Ids2) times the drain to source resistance of the MOSFET when on (RDSon). Use of the comparator circuitry may reduce the time delay associated with turning the MOSFET off to prevent a high reverse inrush current within a power supply.
    Type: Grant
    Filed: December 26, 2002
    Date of Patent: May 27, 2008
    Assignee: Network Appliance, Inc
    Inventor: Zoltan Zansky
  • Patent number: 7342760
    Abstract: A circuit arrangement for protection against electrostatic discharge for a field-effect transistor is disclosed. The arrangement includes a first and a second controllable path each having a control terminal. The control terminals of the controllable paths are coupled to a source terminal of the field-effect transistor. A first terminal of the first controllable path is connected to a control terminal of the transistor, and a first terminal of the second controllable path is connected to a bulk terminal of the unipolar transistor. Second terminals of the controllable paths are connected to the drain terminal. A voltage regulating device includes the circuit arrangement and a comparator configured to generate a control signal in a manner dependent on a difference between two signals applied thereto. A control output of the comparator is coupled to the control terminal of the transistor.
    Type: Grant
    Filed: August 31, 2004
    Date of Patent: March 11, 2008
    Assignee: Infineon Technologies AG
    Inventors: Markus Müllauer, Roman Riederer
  • Patent number: 7324339
    Abstract: A fan sink that includes a dual impeller push-pull axial fan and a heat sink to cool a hot electronic device is presented. The axial fan has a hub motor, a first impeller that is radially proximate to the hub motor, and a second impeller that is radially distal to the hub motor, wherein the first impeller pushes air in a first direction and the second impeller pulls air in a second direction. The heat sink is oriented between the axial fan and the hot electronic device such that the hot electronic device, the heat sink, and the axial fan are axially oriented, wherein cool air is forced onto the heat sink by one impeller in the axial fan, and wherein heated air from the heat sink is removed by an other impeller in the axial fan.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: January 29, 2008
    Assignee: International Business Machines Corporation
    Inventors: Jimmy Grant Foster, Sr., Michael Sean June, Albert Vincent Makley, Jason Aaron Matteson
  • Publication number: 20070217104
    Abstract: An input protection circuit comprises a reverse flow preventing diode, a series circuit of a diode and a Zener diode, and a current path forming resistor or diode. The reverse flow preventing diode is connected between an input terminal and an internal circuit. The series circuit is connected between the input terminal and a ground. The current path forming resistor or diode is connected between a first common connection point of the reverse flow preventing diode and the internal circuit and a second common connection point of the series circuit, and sets a potential at the first common connection point to be less than a potential at the input terminal when the surge voltage is applied to the input terminal.
    Type: Application
    Filed: March 8, 2007
    Publication date: September 20, 2007
    Applicant: DENSO CORPORATION
    Inventors: Shinichiro Nakata, Hiroyuki Ban, Satoshi Ichikawa
  • Patent number: 7259537
    Abstract: A polarity-reversal protector for power sources, in particular for automobile batteries, which is connected between a power source and at least one consumer and/or at least one generator, is described. The polarity-reversal protector is to prevent the reverse polarity current from flowing through the connected systems, so that the systems may not be damaged in case of polarity reversal. For this purpose, the polarity-reversal protector includes means for recognizing whether the two poles of the power source are connected to the appropriate terminals of the consumer and/or generator, and means for decoupling the power source from the consumer and/or from the generator if the two poles of the power source have been transposed during connection to the consumer and/or generator.
    Type: Grant
    Filed: May 11, 2002
    Date of Patent: August 21, 2007
    Assignee: Robert Bosch GmbH
    Inventors: Henning Hauenstein, Richard Spitz, Stephan Ernst, Achim Henkel