Balancing (e.g., Known/unknown Voltage Comparison, Bridge, Rebalancing) Patents (Class 324/98)
  • Patent number: 10191524
    Abstract: Techniques for low-power USB Type-C receivers with high DC-level shift tolerance are described herein. In an example embodiment, a USB-enabled device comprises a receiver circuit coupled to a Configuration Channel (CC) line of a USB Type-C subsystem. The receiver circuit is configured to receive data from an incoming signal on the CC line even when the incoming signal has more than 250 mV of DC offset with respect to local ground, and to operate in presence of a VBUS charging current that is specified in a USB-PD specification.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: January 29, 2019
    Assignee: Cypress Semiconductor Corporation
    Inventors: Rishi Agarwal, Nicholas Alexander Bodnaruk
  • Patent number: 9811135
    Abstract: Techniques for low-power USB Type-C receivers with high DC-level shift tolerance and high noise rejection are described herein. In an example embodiment, a USB-enabled device comprises a receiver circuit coupled to a Configuration Channel (CC) line of a USB Type-C subsystem. The receiver circuit is configured to receive data from an incoming signal on the CC line even when the incoming signal has more than 250 mV of DC offset with respect to local ground, and to reject the incoming signal even when the incoming signal includes noise with a magnitude of more than 300 mVpp.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: November 7, 2017
    Assignee: Cypress Semiconductor Corporation
    Inventors: Rishi Agarwal, Nicholas Alexander Bodnaruk
  • Patent number: 9404956
    Abstract: A power system for a vehicle includes at least two battery packs spaced away from each other. A first battery pack includes a plurality of battery cells and a switching element electrically connected with the battery cells. A second battery pack includes a resistor electrically connected in series with the switching element, and sense circuitry configured to detect voltage across the resistor indicative of leakage current associated with the first battery pack.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: August 2, 2016
    Assignee: Ford Global Technologies, LLC
    Inventor: Benjamin A. Tabatowski-Bush
  • Patent number: 9306609
    Abstract: A front-end of a first differential circuit is DC-coupled to a second differential circuit. The front-end comprises a resistive element, a voltage sensor and a current adjustor. The resistive element has a resistivity between a first end that is DC-coupled to the second circuit and a second end that is DC-coupled to the first circuit and accepts a programmable current passing therethrough to impose a voltage across the element that varies in direction and amplitude according to the current value. The voltage sensor senses a difference between a DC voltage at the second end of the resistive element and a desired reference voltage of the first circuit. The current adjustor adjusts a direction and amplitude of the programmable current so that the voltage of the first circuit matches the desired reference voltage of the first circuit. The first circuit may be a receiver circuit and the second circuit may be a transmitter circuit.
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: April 5, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Marc-Andre LaCroix
  • Patent number: 9018937
    Abstract: An electromechanical system (MEMS) voltmeter. An exemplary MEMS voltmeter includes a proof mass mounted to a substrate in a teeter-totter manner. The MEMS voltmeter also includes an input voltage plate located on the substrate under a first end of the proof mass. The first input voltage plate receives a voltage from a device under test. A drive voltage plate is located on the substrate under a second end of the proof mass. A first sense input voltage plate is located on the substrate under the first end of the proof mass. A second sense voltage plate is located on the substrate under the second end of the proof mass. A rebalancing circuit receives signals from the proof mass and the first and second sense voltage plates and generates a voltage value that is equal to the root mean square (RMS) voltage of the device under test.
    Type: Grant
    Filed: January 17, 2012
    Date of Patent: April 28, 2015
    Assignee: Honeywell International Inc.
    Inventor: Paul M. Werking
  • Patent number: 8981758
    Abstract: A measurement bridge, in particular for a network analyzer, including a reference port, a central output port and a balun having a first balun input connector and a first and a second balun output connector. The first balun output connector is connected to a first signal path and the second balun output connector is connected to a second signal path. The central output port is connected to the first signal path, and the reference port is connected to the second signal path. The electrical parameters of the first signal path and the second signal path are approximately the same.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: March 17, 2015
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Martin Leibfritz, Werner Held
  • Patent number: 8933688
    Abstract: A fast AC voltage detector includes a bridge rectifier connected to an AC power source, a threshold detector connected to an output of the bridge rectifier, a voltage isolation circuit connected to the threshold detector, a continuous voltage averager connected to an output of the voltage isolation circuit, and a Schmidt trigger connected to the continuous voltage averager. The Schmidt trigger is operable to output a first voltage level when a load is preset on said AC power source and a second voltage level when no load is present on said AC power source.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: January 13, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Eric O. Varland, Karl James Hamilton, Philip Chandler
  • Patent number: 8917079
    Abstract: A reference potential adjusting apparatus is provided. The reference potential adjusting apparatus includes a reference potential measuring unit configured to measure a potential of a solution, a counter electrode disposed in the solution, and configured to change the potential of the solution through oxidation-reduction reactions with the solution, and a comparator configured to compare a measurement voltage provided by the reference voltage measuring unit to a reference voltage provided by a reference voltage supply unit, and to adjust reactions of the counter electrode with the solution according to the result of the comparison. The reference potential measuring unit includes a reference electrode, a common electrode disposed to be spaced apart from the reference electrode, and at least one nano structure contacting the reference electrode and the common electrode, and having electrical conductivity changing according to the potential of the solution.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: December 23, 2014
    Assignee: SNU R&DB Foundation
    Inventors: Jin Hong Ahn, Young June Park
  • Patent number: 8912785
    Abstract: Techniques are disclosed relating to radio frequency (RF) power detection. In one embodiment, a power detection circuit includes a multiplier circuit configured to multiply a first voltage signal by a second voltage signal. The multiplier circuit receives the first voltage signal at gates of a first transistor pair and receives the second voltage signal at gates of second and third transistor pairs. In some embodiments, a drain of a first transistor in the first transistor pair is coupled to sources of the second transistor pair, and drain of a second transistor in the first transistor pair is coupled to sources of the third transistor pair. In some embodiments, the power detection circuit includes a comparison circuit that compares the first pair of currents and a second pair of currents associated with a threshold voltage signal.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: December 16, 2014
    Assignee: Silicon Laboratories Inc.
    Inventor: Andras Vince Horvath
  • Patent number: 8823358
    Abstract: A calibration method for adjusting an offset voltage of a unit is proposed. The unit, capable of operating in a calibration mode or a normal mode, includes a first input terminal, a second input terminal and an output terminal. The calibration method includes: operating the unit in a calibration mode; providing a programmable voltage to the first input terminal; providing a constant voltage to the second input terminal; adjusting the programmable voltage monotonously when an output status of the output terminal is not changed; latching the programmable voltage when the output status toggles; and operating the unit in a normal mode after the output status toggles.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: September 2, 2014
    Assignee: Leadtrend Technology Corp.
    Inventor: Ching-Tsan Lee
  • Patent number: 8774365
    Abstract: A high voltage sensing circuit with temperature compensation comprises a first series of resistors in parallel with a second series of resistors. The first series includes a material with a different temperature coefficient of resistance than in the second series. A voltage measurement circuit calculates a high voltage by use of a voltage across a resistor in the first series and a voltage differential between the series.
    Type: Grant
    Filed: May 7, 2012
    Date of Patent: July 8, 2014
    Assignee: Moxtek, Inc.
    Inventor: Dongbing Wang
  • Patent number: 8760094
    Abstract: An apparatus and method for protecting a power system comprising a generator providing power to an alternating current bus, a power converter for converting alternating current power on the alternating current bus to direct current power on a direct current bus, and a direct current load powered by the direct current power on the direct current bus. An undesired condition is identified at the input to the power converter from the alternating current bus. The undesired condition is caused by at least one of the power converter, the direct current bus, or the load. The power converter is disconnected from the alternating current bus in response to identifying the undesired condition for at least a time delay. The time delay is selected such that the power converter is disconnected from the alternating current bus before the alternating current bus is disconnected from the generator due to the undesired condition.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: June 24, 2014
    Assignee: The Boeing Company
    Inventors: Eugene V. Solodovnik, Jeffrey J. White
  • Patent number: 8729884
    Abstract: A voltage measuring circuit includes a voltage measuring port, a voltage reference unit, a first voltage comparing unit and a light emitting diode. The voltage measuring port is for receiving an external voltage to be measured. The voltage reference unit includes a port providing a reference voltage. The first voltage comparing unit includes a reference port connected to the voltage reference unit, a measuring port connected to the voltage measuring port, and an output port for outputting a high/low level voltage when the external voltage is lower/higher than the reference voltage. The light emitting diode includes a cathode connected to the output port of the first voltage comparing unit and an anode connected to an external voltage port.
    Type: Grant
    Filed: October 27, 2011
    Date of Patent: May 20, 2014
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventor: Yong-Zhao Huang
  • Patent number: 8730049
    Abstract: A water sensing electrode circuit comprises a voltage source; first electrode; second electrode; first resistor; second resistor; and an inverting comparator with an internal reference voltage, Vc; wherein: said voltage source, first electrode, second electrode, first resistor and second resistor are connected in series; and the negative input of said voltage comparator is attached to the junction of said first and second resistor.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: May 20, 2014
    Assignee: Aquatic Safety Concepts LLC
    Inventors: David M. Cutler, Vincent Berluti, Jr., Thomas F. Healy, Jeffrey William Londona, James Alphonse Marquis, Mark Henry Méndez
  • Publication number: 20140111186
    Abstract: An impedance sourcing circuit for a measurement device configured to measure a device under test (DUT) and method are disclosed. The impedance sourcing circuit includes a voltage/current source. An electrically controlled variable resistance having a control input is configured to adjust the variable resistance is coupled to the DUT. A loop gain controller is coupled to the control input of the electrically controlled variable resistance. The loop gain controller is configured to drive the control input of the electrically controlled variable resistance to adjust the variable resistance to generally match the impedance of the DUT. The impedance sourcing circuit may also include a voltage detector configured to detect a voltage across the DUT and a voltage reference. The loop gain controller may be configured to drive the control input of the electrically controlled variable resistance based on the voltage detected across the DUT and the voltage reference.
    Type: Application
    Filed: October 23, 2012
    Publication date: April 24, 2014
    Applicant: KEITHLEY INSTRUMENTS, INC.
    Inventor: James A. Niemann
  • Patent number: 8633840
    Abstract: A determining method and apparatus thereof for a transition point of a sequence which can be applied to a decoder. The determining method determines the transition point of the sequence having N numbers, wherein the sequence is composed of a first value and a second value and N is a positive integer. The determining method includes determining the position the first value appearing consecutively in the sequence to determine a first interval; determining the position the second value appearing consecutively in the sequence to determine a second interval; and determining the longer interval between the first interval and the second interval, when the first interval is longer, determining an adjacency of the first interval and the second value as the transition point according to the first interval, and when the second interval is longer, determining an adjacency of the second interval and the first value as the transition point.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: January 21, 2014
    Assignee: MStar Semiconductor, Inc.
    Inventors: Po Lin Yeh, Chien-Hsing Lin, Jui-Hua Yeh, Shao Ping Hung, Chih-Tien Chang
  • Patent number: 8575950
    Abstract: A resistance measuring apparatus which includes a variable voltage source, a signal display circuit, a bridge consisting of a first standard resistor, a second standard resistor, an adjustable resistor and the unknown resistor, a bridge balance display circuit and a dynamic voltage display circuit alternatively connected within the bridge. The resistance measuring apparatus is adapted to measure static resistance and dynamic resistance variation of an unknown resistor in the case of external environment having changed dramatically.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: November 5, 2013
    Assignee: Ningbo University
    Inventors: Jiankang Chen, Jintao Lei, Minghua Zhang
  • Publication number: 20130285641
    Abstract: Methods and systems are described for monitoring and compensating an offset between a reference voltage used in a first device and a corresponding reference voltage used in a second device. The first device can include offset circuitry. The offset circuitry receives two voltage signals. The first voltage signal is equal to a first voltage value that is used as a reference voltage in the first device. The second voltage signal can be a time-varying voltage signal that has a known relationship with a second voltage value that is used as a reference voltage in the second device. The offset circuitry can then determine the second voltage value from the second voltage signal, and output an offset value based on a difference between the first voltage value and the second voltage value.
    Type: Application
    Filed: April 26, 2012
    Publication date: October 31, 2013
    Applicant: SYNOPSYS, INC.
    Inventors: Edvard Mkrtchyan, Dino Anthony Toffolon, Adam Burns
  • Patent number: 8552710
    Abstract: A calibration method for adjusting an offset voltage of a unit is proposed. The unit, capable of operating in a calibration mode or a normal mode, includes a first input terminal, a second input terminal and an output terminal. The calibration method includes: operating the unit in a calibration mode; providing a programmable voltage to the first input terminal; providing a constant voltage to the second input terminal; adjusting the programmable voltage monotonously when an output status of the output terminal is not changed; latching the programmable voltage when the output status toggles; and operating the unit in a normal mode after the output status toggles.
    Type: Grant
    Filed: December 15, 2010
    Date of Patent: October 8, 2013
    Assignee: Leadtrend Technology Corp.
    Inventor: Ching-Tsan Lee
  • Publication number: 20130214762
    Abstract: A measurement bridge, in particular for a network analyzer, including a reference port, a central output port and a balun having a first balun input connector and a first and a second balun output connector. The first balun output connector is connected to a first signal path and the second balun output connector is connected to a second signal path. The central output port is connected to the first signal path, and the reference port is connected to the second signal path. The electrical parameters of the first signal path and the second signal path are approximately the same.
    Type: Application
    Filed: February 21, 2012
    Publication date: August 22, 2013
    Applicant: Rohde & Schwarz GmbH & Co. KG
    Inventors: Martin LEIBFRITZ, Werner HELD
  • Publication number: 20130181697
    Abstract: An electromechanical system (MEMS) voltmeter. An exemplary MEMS voltmeter includes a proof mass mounted to a substrate in a teeter-totter manner. The MEMS voltmeter also includes an input voltage plate located on the substrate under a first end of the proof mass. The first input voltage plate receives a voltage from a device under test. A drive voltage plate is located on the substrate under a second end of the proof mass. A first sense input voltage plate is located on the substrate under the first end of the proof mass. A second sense voltage plate is located on the substrate under the second end of the proof mass. A rebalancing circuit receives signals from the proof mass and the first and second sense voltage plates and generates a voltage value that is equal to the root mean square (RMS) voltage of the device under test.
    Type: Application
    Filed: January 17, 2012
    Publication date: July 18, 2013
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventor: Paul M. Werking
  • Publication number: 20130027053
    Abstract: A semiconductor device has an internal power bus, parallel power connections for connecting the power bus with an external power supply and a test module. The test module includes a sensor for producing first and second differential sensor signals that are functions of voltages at spaced positions in one of the parallel connections produced by current in the parallel connection. The test module includes first and second balanced differential pair comparators that receive first and second reference signals and produce a first comparator signal that is a function of the relative values of the first differential sensor signal and the first reference signal, and a second comparator signal that is a function of the relative values of the second differential sensor signal and the second reference signal. The test module includes an output element that produces an output signal that is a function of the first and second comparator signals.
    Type: Application
    Filed: June 13, 2012
    Publication date: January 31, 2013
    Applicant: FREESCALE SEMICONDUCTOR, INC.
    Inventors: Lini LEE, Feng Liu, Ruijie Peng
  • Patent number: 8330447
    Abstract: A self-balancing Wheatstone bridge that provides frequency and power information. The frequency information obtained can be applied to correct the power measurement to provide excellent match, excellent frequency insensitivity, good dynamic range, good frequency range, and adequate frequency accuracy. The system is highly responsive, simple, and cost effective.
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: December 11, 2012
    Assignee: Ladybug Technologies, LLC
    Inventors: Richard R. Hawkins, Jon R. Sigler
  • Publication number: 20120268283
    Abstract: A circuit board includes a current balancing unit that receives a number of current values from ammeters. A minimum current value between the current values is determined by the current balancing unit. Resistance of one or more variable resistors of the current balancing unit is adjusted by the current balancing unit to make the current value from one or more the ammeters serially connected to the one or more the variable resistors to be substantially equal to the minimum current value.
    Type: Application
    Filed: June 24, 2011
    Publication date: October 25, 2012
    Applicant: HON HAI PRECISION INDUSTRY CO., LTD.
    Inventors: SHOU-KUO HSU, YUNG-CHIEH CHEN, HSIEN-CHUAN LIANG, SHEN-CHUN LI, WEN-LAING TSENG, CHIA-NAN PAI
  • Publication number: 20120246801
    Abstract: A water sensing electrode circuit comprises a voltage source; first electrode; second electrode; first resistor; second resistor; and an inverting comparator with an internal reference voltage, Vc; wherein: said voltage source, first electrode, second electrode, first resistor and second resistor are connected in series; and the negative input of said voltage comparator is attached to the junction of said first and second resistor.
    Type: Application
    Filed: June 6, 2012
    Publication date: October 4, 2012
    Inventors: David M. Cutler, Vincent Berluti, JR., Thomas F. Healy, Jeffrey William Londona, James Alphonse Marquis, Mark Henry Méndez
  • Publication number: 20120235666
    Abstract: A voltage detector detects a detected AC voltage generated in a detected object, and includes a detection electrode that is disposed facing the detected object, and an integrating circuit including an operational amplifier that has a first input terminal set at a reference voltage and a second input terminal connected to the detection electrode that integrates a detection current and outputs the integrated signal whose amplitude changes in accordance with the potential difference. The voltage detector also includes an insulating circuit that inputs the integrated signal and outputs the inputted integrated signal so as to be electrically insulated from an input side, and a voltage generating circuit that amplifies a signal based on the integrated signal so as to reduce the potential difference and generate the reference signal.
    Type: Application
    Filed: May 30, 2012
    Publication date: September 20, 2012
    Applicant: HIOKI DENKI KABUSHIKI KAISHA
    Inventor: Koichi YANAGISAWA
  • Publication number: 20120139553
    Abstract: A system and method for measuring a voltage of electrochemical cells of a pack. The system includes circuit elements individually associated with respective electrochemical cells of the pack and having electrical characteristics that are different such that individual electrochemical cells can be distinguished from one another. The system also includes a measurement circuit configured to measure the voltage of the electrochemical cells and to identify an electrochemical cell being measured based on an electrical characteristic of a circuit element associated with the electrochemical cell. Various self-diagnostic techniques are described, as well as techniques for measuring sense resistance, reducing sense resistance, and measuring changes in voltage of a cell over time.
    Type: Application
    Filed: December 6, 2011
    Publication date: June 7, 2012
    Applicant: Coda Automotive, Inc.
    Inventors: Peter Fredrick Nortman, Daniel A. Sufrin-Disler, Phillip John Weicker, Patrick J. Mcgulpin
  • Patent number: 8129981
    Abstract: An apparatus can be coupled to at least two lines for transmitting a differential signal, which is substantially symmetrical to a predefined reference potential, and/or for receiving such a differential signal. The apparatus includes a balancing unit, which can be coupled to the at least two lines and which includes a center tap. A monitoring unit is coupled to the center tap on the input side and is configured such that it monitors a center tap voltage between the center tap and the predefined reference potential and detects errors if the center tap voltage is greater than a predefined threshold value.
    Type: Grant
    Filed: January 2, 2008
    Date of Patent: March 6, 2012
    Assignee: Continental Automotive GmbH
    Inventor: Stephan Bolz
  • Publication number: 20110248699
    Abstract: A calibration method for adjusting an offset voltage of a unit is proposed. The unit, capable of operating in a calibration mode or a normal mode, includes a first input terminal, a second input terminal and an output terminal. The calibration method includes: operating the unit in a calibration mode; providing a programmable voltage to the first input terminal; providing a constant voltage to the second input terminal; adjusting the programmable voltage monotonously when an output status of the output terminal is not changed; latching the programmable voltage when the output status toggles; and operating the unit in a normal mode after the output status toggles.
    Type: Application
    Filed: December 15, 2010
    Publication date: October 13, 2011
    Inventor: Ching-Tsan Lee
  • Patent number: 7957844
    Abstract: A method for stabilization of the power balance in an electric power system including a number of nodes. An instantaneous value of the mains frequency of the electric power system is sensed. In dependence on the frequency deviation of the instantaneous value from a reference frequency value, a selected part of the electric power system, connected in a node, is disconnected in the node. A voltage amplitude value is sensed in the node. A measure of the magnitude of the deviation of the voltage amplitude value from a reference amplitude value is formed. A time lag is formed in dependence on the measure of the magnitude. The part of the electric power system is disconnected in dependence on the time lag.
    Type: Grant
    Filed: January 26, 2004
    Date of Patent: June 7, 2011
    Assignee: ABB AB
    Inventors: Lars Messing, Daniel Karlsson
  • Patent number: 7884596
    Abstract: A self-balancing Wheatstone bridge that provides frequency and power information. The frequency information obtained can be applied to correct the power measurement to provide excellent match, excellent frequency insensitivity, good dynamic range, good frequency range, and adequate frequency accuracy. The system is highly responsive, simple, and cost effective.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: February 8, 2011
    Assignee: Ladybug Technologies, LLC
    Inventors: Richard R. Hawkins, Jon R. Sigler
  • Publication number: 20100253321
    Abstract: The invention relates to a determination circuit for measuring a current. The invention also relates to a method for measuring a current using such a determination circuit and to a computer program product adapted, when being executed by a processor, to integrate a current using such a determination circuit. According to the invention an integration circuit comprising the determination circuit is reset each time the integration value of the current exceeds the threshold until expiration of a predefined maximum integration time. The invention increases the accuracy of integrating a current and also increases the dynamic range of currents that can be integrated. To further increase the dynamic range of currents as can be integrated the determination circuit may comprise circuits having different gain factors.
    Type: Application
    Filed: October 31, 2008
    Publication date: October 7, 2010
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Jacobus Josephus Leijssen, Harry Marinus
  • Publication number: 20100219809
    Abstract: An apparatus can be coupled to at least two lines for transmitting a differential signal, which is substantially symmetrical to a predefined reference potential, and/or for receiving such a differential signal. The apparatus includes a balancing unit, which can be coupled to the at least two lines and which includes a center tap. A monitoring unit is coupled to the center tap on the input side and is configured such that it monitors a center tap voltage between the center tap and the predefined reference potential and detects errors if the center tap voltage is greater than a predefined threshold value.
    Type: Application
    Filed: January 2, 2008
    Publication date: September 2, 2010
    Applicant: CONTINENTAL AUTOMOTIVE GMBH
    Inventor: Stephan Bolz
  • Patent number: 7769497
    Abstract: A method of performing loadflow calculations for controlling voltages and power flow in a power network by reading on-line data of given/specified/scheduled/set network variables/parameters and using control means, so that no component of the power network is overloaded as well as there is no over/under voltage at any nodes in the network following a small or large disturbances.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: August 3, 2010
    Inventor: Sureshchandra B. Patel
  • Patent number: 7706991
    Abstract: An alternator tester is provided for testing an alternator of a vehicle while the alternator is coupled to the vehicle. A sensor is configured to couple to the vehicle and sense a signal related to operation of the alternator. A memory contains data related to operator instructions for performing an alternator tester of a function of vehicle type. A processor configured to provide an output indication of alternator condition based upon the sensed signal. An extra load or connection can be provided for coupling to the electrical system.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: April 27, 2010
    Assignee: Midtronics, Inc.
    Inventors: Kevin I. Bertness, Alan Keith Melton
  • Publication number: 20100007332
    Abstract: In order to detect and evaluate changes in current as a result of electric arcs, a sensor signal, differentiated on the basis of time, is produced with a sensor-dependent frequency bandwidth whose upper cutoff frequency is 40 MHz and whose lower cutoff frequency is 100 kHz. The sensor signal is taken and an evaluation signal is produced with an upper cutoff frequency of less than or equal to 10 MHz. The evaluation signal is compared with a threshold value and a normalized signal is produced, and a pulse duration of the signal is extended to a prescribed time value.
    Type: Application
    Filed: September 18, 2009
    Publication date: January 14, 2010
    Applicant: ELLENBERGER & POENSGEN GMBH
    Inventors: Michael Naumann, Markus Miklis
  • Publication number: 20100007331
    Abstract: A self-balancing Wheatstone bridge that provides frequency and power information. The frequency information obtained can be applied to correct the power measurement to provide excellent match, excellent frequency insensitivity, good dynamic range, good frequency range, and adequate frequency accuracy. The system is highly responsive, simple, and cost effective.
    Type: Application
    Filed: September 26, 2007
    Publication date: January 14, 2010
    Applicant: LADYBUG TECHNOLOGIES, INC.
    Inventors: Richard R. Hawkins, Jon R. Sigler
  • Publication number: 20090201010
    Abstract: A pumping voltage detector includes a first division voltage generating unit for dividing a pumping voltage at a first division ratio to generate a first divided voltage, a second division voltage generating unit for dividing the pumping voltage at a second division ratio different from the first division ratio to generate a second divided voltage, and a detection signal generating unit for comparing one of the first and second divided voltages with a reference voltage to generate a pumping voltage detection signal.
    Type: Application
    Filed: October 31, 2008
    Publication date: August 13, 2009
    Applicant: HYNIX SEMICONDUCTOR, INC.
    Inventor: Yoon-Jae Shin
  • Publication number: 20090026881
    Abstract: A piezoelectric fan comprises a blade (110, 210, 310, 410, 510, 610), a piezoelectric actuator patch (120, 220, 320, 420, 520, 620, 811) adjacent to the blade, and a piezoelectric sensor patch (130, 230, 330, 430, 530, 630, 812) adjacent to one of the piezoelectric actuator patch and the blade. The piezoelectric sensor patch measures a voltage proportional to a deflection of the piezoelectric actuator patch and a deflection of a tip of the blade and uses that voltage to generate an input signal to an active feedback controller (840) that in turn ensures that the oscillation amplitude of the blade satisfies certain cooling specifications.
    Type: Application
    Filed: July 26, 2007
    Publication date: January 29, 2009
    Inventors: Hakan Erturk, Ioan Sauciuc
  • Publication number: 20080136399
    Abstract: A current sensor includes a sensing circuit for sensing current and supplying indications thereof. The current sensor also includes two or more output terminals coupled to the sensing circuit that alternately supply respective indications of the sensed current according to control signals supplied to the current sensor.
    Type: Application
    Filed: December 12, 2006
    Publication date: June 12, 2008
    Inventors: Donald E. Alfano, Timothy J. Dupuis
  • Patent number: 7246015
    Abstract: An alternator tester is provided for testing an alternator of a vehicle while the alternator is coupled to the vehicle. A sensor is configured to couple to the vehicle and sense a signal related to operation of the alternator. A memory contains data related to operator instructions for performing an alternator tester of a function of vehicle type. A processor configured to provide an output indication of alternator condition based upon the sensed signal. An extra load or connection can be provided for coupling to the electrical system.
    Type: Grant
    Filed: June 9, 2004
    Date of Patent: July 17, 2007
    Assignee: Midtronics, Inc.
    Inventors: Kevin I. Bertness, Alan Keith Melton
  • Patent number: 6747205
    Abstract: The invention relates to a device for assisting in the measurement of the earth resistance comprising a ground rod with a wire coiled up on a reel or the like, and electrical connecting means for connecting the wire to the ground rod. To provide such a device which is practical to handle, simple, small, and capable of being produced at low costs, it is provided for the reel or the like to be rotatably mounted on the ground rod. A further improvement results in that the ground rod comprises an offset portion in whose region the reel or the like is rotatably mounted. Preferably, the electrical connecting means between ground rod and wire comprise sliding rings on the rotation axis, the reel or the like. For an rapid exchangeability of the reel, the latter may be mounted on the ground rod by a snap connection.
    Type: Grant
    Filed: March 7, 2002
    Date of Patent: June 8, 2004
    Assignee: Lem Norma GmbH
    Inventor: Jurgen Gobelhaider
  • Patent number: 6714881
    Abstract: A method for time reference compensation in a power metering system, the method comprising monitoring a time-dependent characteristic of incoming AC power over a predetermined local time interval, comparing the monitored characteristic over the predetermined local time interval with the expected value of the characteristic based upon the nominal frequency of the AC power, and calculating a correction to one or more of local real-time and time-based measurements of the power metering system, based on the comparing.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: March 30, 2004
    Assignee: Square D Company
    Inventors: David C. Carlson, Michael J. Devaney
  • Patent number: 6657442
    Abstract: An AC/DC voltage reference system has at least one micromechanically fabricated electrode pair having first and second electrodes facing each other so that the electrodes are disposed at a distance from each other, whereby at least one of the electrodes is movable against a spring force. An AC signal is applied over the electrodes to establish an electrostatic force at a frequency substantially higher than the effective mechanical resonant frequency of the movable electrode. The system further includes an apparatus for detecting the AC voltage applied between the electrodes, thus forming an AC voltage reference.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: December 2, 2003
    Assignee: Valtion teknillinen tutkimuskeskus
    Inventors: Heikki Seppä, Aarne Oja, Mika Suhonen
  • Patent number: 6582840
    Abstract: A method and apparatus for detecting leakage current in the coolant of a fuel cell stack. The invention eliminates the use of a conductivity sensor by using a voltmeter to measure the voltage across the coolant. If the coolant voltage is at or below a predetermined level, an excessive level of conductivity in the coolant exists, and the presence of leakage current is reported. The invention can also compare the coolant voltage to two different predetermined voltage levels, the second one higher than the first. A coolant voltage at or below the lower voltage level could signal a shut down of the stack, while a coolant voltage at or below the higher voltage level could signal an alarm or another diagnostic. The invention can optionally use a second voltmeter to measure the voltage across the stack and calculate the resistivity and conductivity of the coolant.
    Type: Grant
    Filed: January 8, 2001
    Date of Patent: June 24, 2003
    Assignee: General Motors Corporation
    Inventor: Matthew K. Hortop
  • Publication number: 20020105316
    Abstract: A circuit for sensing the voltage across a power device, such as an insulated gate bipolar transistor (IGBT), that provides a power signal, such as to a motor. Where power devices are connected in a half bridge configuration, the sensing circuitry provides low side and high side sense signals. The signals indicate respectively when voltage changes across the low side and high side power devices. If on times of the devices are separated by deadtime, one sense signal can indicate the beginning of deadtime and the other can indicate the ending of the deadtime. The sensing circuitry can provide a sense result signal indicating whether voltage across the power device is greater than a reference voltage.
    Type: Application
    Filed: November 30, 2001
    Publication date: August 8, 2002
    Applicant: International Rectifier Corporation
    Inventor: Toshio Takahashi
  • Patent number: 6118409
    Abstract: In order to inspect at least one antenna branch (A1, A2, . . . An), in particular in a vehicle, a power level to be radiated is initially fed into the antenna branch, after which a power level which is reflected in the antenna branch is sensed. Then, a relationship is formed between the fed-in power level and the reflected power level in order to obtain a quality signal indicating the quality of the antenna branch. This procedure can be carried out successively when there are a plurality of antenna branches, in order to select, as a function of the respective quality signal, that antenna branch at which the reflected power level is lowest. In this way, on the one hand, it is possible to check the matching of the antenna branches while, on the other hand, it is possible to ensure that, for example when specific antenna branches are damaged, it is always possible to find other antenna branches for satisfactory communication.
    Type: Grant
    Filed: February 12, 1998
    Date of Patent: September 12, 2000
    Assignee: Nokia Mobile Phones, Ltd.
    Inventors: Andreas Pietsch, Uwe Dalisda, Jukka-Matti Karhu, Jurgen Hess, Holger Christiansen
  • Patent number: 5877619
    Abstract: A method of null balancing a hand field-strength meter is described in which the effect of the measurement probe on the balancing is suppressed by short-circuiting the measurement probe by two MOS-FETs connected in series across the probe outputs so that the null balancing can be performed when the field-strength meter is located in the vicinity of a high strength field. In a preferred embodiment of the null balancing circuit for the meter another circuit branch consisting of two other complimentary MOS-FETs connected in series with each other is connected in parallel across the first two MOS-FETs via two resistors R1,R2.
    Type: Grant
    Filed: October 2, 1996
    Date of Patent: March 2, 1999
    Assignee: Wandel & Goltermann, Management Holding GmbH
    Inventor: Helmut Keller
  • Patent number: 5461322
    Abstract: A feedback operated DC bridge circuit for monitoring the voltage variations in a voltage divider circuit using a voltage controlled resistance component to reach a null balance across the bridge. Amplification is provided at higher accuracy near the null point when the voltage difference across the bridge is zero. The feedback bridge circuit includes an integrator which directly drives the controlling component to the value of the resistance in an unknown branch to force the null condition. The voltage controlled component (configured as a discrete metal oxide semiconductor device or bipolar junction transistor) and the balancing scheme are suitable for microfabrication and provides noise-rejection enhancement. The interconnected integral feedback of the autonulling DC bridge enables both a neural network for pre-processing sensor input in a spatial domain as well as general analog computation that mimics a first order differential equation in the form of the system state equation.
    Type: Grant
    Filed: August 6, 1993
    Date of Patent: October 24, 1995
    Assignees: Geo-Centers, Inc., Naval Research Laboratory
    Inventors: Paul P. Bey, Jr., Thomas L. Fare, David J. Yonce
  • Patent number: 5313165
    Abstract: An apparatus for monitoring current through a lamp circuit that uses a series resistance shunt in the circuit with one end connected to a current source and the second end connected to the lamp. The apparatus includes a comparator that is connected across the shunt and has a threshold switching voltage wherein a voltage across the shunt that is larger than the threshold switching voltage will switch the comparator on and a voltage across the shunt that is smaller than the threshold switching voltage will switch the comparator off. A biasing circuit, connected to and controlling the comparator, temperature compensates the threshold switching voltage such that the threshold switching voltage changes proportionally to absolute temperature and controls a sensitivity of the threshold switching voltage to changes in a supply voltage of the circuit. In a preferred embodiment, the shunt is a portion of the printed board trace.
    Type: Grant
    Filed: July 17, 1991
    Date of Patent: May 17, 1994
    Assignee: Analog Devices, Inc.
    Inventor: A. Paul Brokaw