Polyphase Patents (Class 324/107)
  • Patent number: 10715056
    Abstract: A three-phase converter configured to be coupled between a direct current system and an alternating current system to perform interconversion between a direct current and an alternating current, where the three-phase converter includes a switching network, a three-phase filter coupled to the switching network, a sampling circuit coupled to the three-phase filter, a control circuit coupled to the three-phase sampling circuit, an active damping circuit coupled to the control circuit and the sampling circuit, and a modulation circuit coupled between the active damping circuit and the switching network, where the sampling circuit is configured to obtain three-phase currents in the three-phase filter, and send the three-phase currents to the active damping circuit, the active damping circuit is configured to obtain new three-phase modulated waves according to the three-phase currents, and transmit the new three-phase modulated waves to the modulation circuit.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: July 14, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Fangcheng Liu, Kai Xin, Haibin Guo
  • Patent number: 10707677
    Abstract: A differential protection method allows monitoring a three-phase transformer. Current measured values are recorded for each phase on all sides of the transformer, a phase-related formation of difference values is carried out using the current measured values from a reference side and amplitude-adjusted and phase-angle-adjusted current measured values from all other sides. An internal error is detected if a difference value exceeds a threshold value. In order to form the amplitude-adjusted and phase-angle-adjusted current measured values, the current measured values recorded for all phases are initially subjected to an amplitude adjustment and then to a phase angle adjustment. In order to allow the phase angle shift to be freely adjusted, a defined matrix equation with a defined matrix coefficient is used for the phase angle adjustment of the current measured values from the particular other side of the transformer. There is also described a differential protection device.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: July 7, 2020
    Assignee: Siemens Aktiengesellschaft
    Inventor: Joerg Weilbier
  • Patent number: 10613119
    Abstract: A voltage measurement system has a voltage measuring device connected to a device under test by a voltage divider to drop high voltages (e.g., peaking at or above 100 kilovolts) at a measurement point to lower levels for processing by a voltage measurement and wireless printed circuit board. The voltage measuring device communicates raw measurement data wirelessly (e.g., via Bluetooth®) to a remote device such as a mobile phone, laptop or portable meter head having a display and processing device programmed to calculate voltage measurements such has absolute average (ABS AVG), AC root mean square (RMS), +/?peak voltage, and AC or DC coupling. The remote device can wirelessly communicate with multiple voltage measuring devices to capture raw measurement data therefrom for voltage measurement applications with multiple measurement points (e.g., three-phase measurement, and transformer testing).
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: April 7, 2020
    Assignee: Hubbell Incorporated
    Inventors: Michael David Carson, John Edward Brower, Joseph Neuhaus Dowdell
  • Patent number: 10613123
    Abstract: A system and method for estimating the magnitude and phase of magnetic and electrical currents in a power line comprising at least one processor operating to create a model of the power line and derive expected complex magnetic and electric-field values; at least one memory; at least one sensor positioned proximate to the at least one power line for sensing and providing measurements of the magnetic and electric fields of the at least one power line; the at least one processor operating to compute a set of complex magnetic and electric field values based upon the measurements provided by the at least one sensor and to estimate parameters related to the complex voltage and/or current of the at least one power line based upon the measured field values and the set of expected complex electric current and voltage values derived from a model of at least one power line.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: April 7, 2020
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Thorkell Gudmundsson, David M Hull, James W. Waite, Ross N Adelman
  • Patent number: 10530146
    Abstract: A differential protection method for generating a fault signal includes measuring current measurements at least at two different measuring points of a multiphase transformer for each phase. The current measurements for each phase are used to form differential current values and stabilization values. The fault signal is generated if it is determined during a trigger region check that a measurement pair of at least one of the phases, being formed by using one of the differential current values and the associated stabilization value in each case, is in a predefined trigger region. In order to be able to selectively and reliably distinguish an external fault from an internal fault, the transformer has a grounded star point and a zero system current flowing through the star point is used to form the stabilization values. A corresponding differential protection device is provided for performing the differential protection method.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: January 7, 2020
    Assignee: Siemens Aktiengesellschaft
    Inventor: Frank Mieske
  • Patent number: 10527704
    Abstract: A utility meter includes a meter housing in which are supported at least one current coil, a temperature sensor, and a processing circuit. The current coil can be coupled to receive heat energy from within or on the meter socket. The temperature sensor generates a sensor signal based on a temperature within the meter housing. The processing circuit is operably coupled to the temperature sensor and the at least one current coil. The processing circuit obtains the sensor signal and generates temperature information therefrom, and also generates measurements of current through the current coil. The processing circuit generates an adjustment based at least on the square of the measured current, and determines whether an abnormal condition exists based on the temperature information, the adjustment, and a threshold. The processing circuit can generate an output signal to a display or communication circuit responsive to determining that the abnormal condition exists.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: January 7, 2020
    Assignee: Landis+Gyr LLC
    Inventor: Mark David Minich
  • Patent number: 10523141
    Abstract: A motor control apparatus that applies a pulse voltage for each phase of a three phase brushless motor to make current flow, the apparatus provided with: a generating unit for causing the pulse voltage to be generated by shifting the phase of the pulse voltage for each phase of the three phase brushless motor; and a detecting unit for detecting a current flowing to a coil of each phase of the three phase brushless motor to which the pulse voltage is applied by switching by a predetermined sampling period for each phase one-by-one, wherein a relationship between the sampling period of the detecting unit and a phase shift amount of the pulse voltage of each phase generated by the generating unit is set so that the detecting unit can detect the current for each phase of the three phase brushless motor.
    Type: Grant
    Filed: April 2, 2018
    Date of Patent: December 31, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masanao Motoyama, Toshiaki Minami
  • Patent number: 10431969
    Abstract: A sliding outlet engages an outlet box having three bus bars, one for each of the hot, neutral, and ground wires of a three conductor wire. Extension portions of the sliding outlet achieve a friction fit to the bus bars so that the outlet is energized without the need for wire nuts.
    Type: Grant
    Filed: January 11, 2019
    Date of Patent: October 1, 2019
    Inventor: Larry J. Dicken
  • Patent number: 10386396
    Abstract: Systems, methods, and devices relating to the extraction of parameters for a grid voltage. A multi-block hybrid PLL or hybrid observer receives grid voltage. The grid voltage is received by a harmonic/noise decomposer block which separates the harmonic/noise component of the incoming voltage from the clean voltage signal. The clean voltage signal is then output from the PLL/observer. The clean voltage signal is also sent to an amplitude estimator block which estimates the amplitude of the clean voltage signal. The harmonic/noise component of the input voltage signal is sent, along with the clean voltage signal, to a frequency estimator block. The frequency estimator block then determines the phase angle of the incoming signal as well as the frequency of the incoming voltage signal.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: August 20, 2019
    Assignee: SPARQ SYSTEMS INC.
    Inventors: Suzan Eren, Majid Pahlevaninezhad, Shangzhi Pan, Praveen Jain
  • Patent number: 10372842
    Abstract: A method and device for calibrating a power model for a multi-state device. The device includes a processor and a computer readable medium containing instructions to instruct the processor to perform the method. The method includes receiving a device state log comprising a time-based representation of multi-state device states for a first period of time and a power trace comprising a time-based representation of power consumed by the multi-state device for the first period of time; eroding the device state log to reduce potential noise present at state transitions within the device state log, thereby producing an eroded device state log; determining energy consumption for each state transition in the eroded power state log; creating an updated power model for the multi-state device based upon the eroded power state log; and storing the updated power model in a non-transitory computer readable medium operably connected to the multi-state device.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: August 6, 2019
    Assignee: Xerox Corporation
    Inventor: Fritz Francis Ebner
  • Patent number: 10088546
    Abstract: A system for a three-phase electric power system includes a plurality of voltage sensors sensing three-phase voltages of the three-phase electric power system; a plurality of current sensors sensing three-phase currents of the three-phase electric power system; and a number of analog-to-digital converters converting the sensed three-phase voltages and the sensed three-phase currents of the three-phase electric power system to corresponding digital values.
    Type: Grant
    Filed: May 1, 2014
    Date of Patent: October 2, 2018
    Assignee: EATON INTELLIGENT POWER LIMITED
    Inventors: Zhi Gao, Brian Zachary Zaremski, Alan Kenji Hayashi
  • Patent number: 10034068
    Abstract: Disclosed are various systems and methods related to detecting a type of pulse source that is removably attached to a computing device via a data line. The computing device receives two or more pulses from a pulse source via the data line. Based upon the number of pulses received on each input, the computing device can determine the type of pulse source to which it is attached. The computing device further determines an adjustment to the consumption counter based on the identified type of pulse source and the number of received pulses.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: July 24, 2018
    Assignee: Landis+Gyr Innovations, Inc.
    Inventor: John Thorpe
  • Patent number: 9915720
    Abstract: An electrical panel meter system may include a plurality of meter modules housed in an electrical panel enclosure. Each meter module may be configured to sample electrical readings related to electrical power provided to a respective branch circuit of the electrical panel meter system. To field test the metering accuracy of each meter module, a field tester may be coupled to the electrical panel enclosure. The field tester may inject an electrical signal via a test conductor provided in the electrical panel enclosure. The test conductor may be coupled to each meter module. The field tester may measure an electrical parameter of the injected electrical signal and compare it to electrical readings sampled by the meter modules. A pass/fail result for each meter module may be indicated. Methods of field testing meter modules in an electrical panel meter system are also provided, as are other aspects.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: March 13, 2018
    Assignee: Siemens Industry, Inc.
    Inventors: Matthew Leidy, Kevin Miller
  • Patent number: 9904308
    Abstract: Interconnection meter socket adapters are provided. An interconnection meter socket adapter comprises a housing enclosing a set of electrical connections. The interconnection meter socket adapter may be configured to be coupled to a standard distribution panel and a standard electric meter, thereby establishing connections between a distribution panel and a user such that electrical power may be delivered to the user while an electrical meter measures the power consumption of the user. A power regulation module is disposed between the interconnection meter socket adapter, and configured to selectively connect one or more energy sources or energy sinks.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: February 27, 2018
    Assignee: San Diego Gas & Electric Company
    Inventors: Ken Parks, Michael Colburn
  • Patent number: 9869704
    Abstract: A power measurer measures, for each current transformer CT, electric energy supplied to equipment or electric energy supplied from the equipment based on a current measured by a current measurer and a voltage measured by a voltage measurer. A sign memory stores, for each current transformer CT, information indicating whether the electric energy measured by the power measurer when the current transformer CT is disposed in a correct direction on a power line shows a positive sign or a negative sign. A determiner determines that, when the sign stored in the sign memory differs from the sign of the electric energy measured by the power measurer, the current transformer CT is disposed in an incorrect direction on the power line.
    Type: Grant
    Filed: June 2, 2014
    Date of Patent: January 16, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masahiro Ishihara, Yoshiaki Koizumi
  • Patent number: 9851404
    Abstract: An embodiment relates to a switchgear for a single-phase motor and a three-phase motor, the switchgear including a processing unit and a first, second and third current path, the first and third current path each including a current transformer. The processing unit is adapted to detect the current I1 of the first current path and the current I3 of the third current path. To provide a cost-effective switchgear for a one-phase motor and a three-phase motor which is adapted to identify the failure of every single phase in the three-phase operation and a phase failure in the one-phase operation, the processing unit is designed such as to detect the currents I1, I3 of the first and third current path and to determine, based on the phase shift between the detected currents I1, I3 of the first and third current path in which operating mode the switchgear is operated.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: December 26, 2017
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Dirk Hertz, Marco Sch├Ânenberg, Helene Steuer, Stefan Zitzler
  • Patent number: 9842482
    Abstract: A signal detecting device includes a visualization device including a plural connectors to which a communication cable is connected, a plural detecting circuits that are provided for each of the connectors to be detected, branch and extract a part of a signal transmitted through the communication cable connected to the connectors, and indicate an existence of an data communication based on the extracted signal, and a detecting card that is insertable into and detachable from a card connector arranged in the visualization device and mounts at least a part of the detecting circuit.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: December 12, 2017
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yohei Shirakawa, Koki Hirano, Yoshitake Ageishi, Yuki Haga
  • Patent number: 9829519
    Abstract: A system and method for a branch current monitoring system employing a 2-Phase Wye, a Single-Phase 3-Wire or a Single-Phase 2-Wire wiring configuration that is configured to identify a phase association and a polarity for a branch circuit current sensor using the phase angle between voltage and current. Also, a system and method for verifying phase association and polarity determinations for branch circuit current sensors that utilizes real and reactive power measurements.
    Type: Grant
    Filed: May 27, 2015
    Date of Patent: November 28, 2017
    Assignee: EATON CORPORATION
    Inventors: Alan Kenji Hayashi, Brian Zachary Zaremski, Zhi Gao
  • Patent number: 9791483
    Abstract: Embodiments consistent with the present disclosure provide an electrical circuit and a method for measuring the power and power consumption of an LED lighting device in real time. The circuit includes a controlling unit configured to process data; a display unit configured to display data received from the controlling unit and other components; a power supply and driving unit configured to supply power; an LED light source; and a RF unit configured to send data to remote terminals. The electrical circuit further includes an input power sampling unit, an output voltage sampling unit, and an output current sampling unit, which are configured to capture the real time input voltage, output voltage, and output current data respectively. Further, the controlling unit may determine the power and power consumption of the LED lighting device by using the received real time voltage and current data measurements, and referring to the stored input voltage-efficiency curves.
    Type: Grant
    Filed: May 5, 2014
    Date of Patent: October 17, 2017
    Assignee: ZHEJIANG SHENGHUI LIGHTING CO., LTD
    Inventors: Chaoqun Sun, Jinxiang Shen
  • Patent number: 9766271
    Abstract: An electrical circuit protecting an electrical utility meter used in connection with an electrical supply connection having a plurality of phases is disclosed. The circuit includes a plurality of voltage transformers, each of the plurality of voltage transformers electrically connected between one of the plurality of phases of the electrical supply connection and an input power connection of an electrical meter, and an electrical connection of the electrical meter dedicated to a power supply of the electrical meter.
    Type: Grant
    Filed: April 7, 2014
    Date of Patent: September 19, 2017
    Assignee: TSTM, Inc.
    Inventor: Greg May
  • Patent number: 9712372
    Abstract: A cable signal detector is configured to detect the presence or absence of information communication in a communication cable including a plurality of signal line pairs for differential signaling. The cable signal detector includes a plurality of detecting portions each of which is configured to partially branch and draw a transmission signal from a different signal line pair, rectify the branched and drawn signal into a direct current, and output that direct current, and a displaying portion configured to display the presence or absence of information communication, based on outputs of the plurality of detecting portions. The outputs of the plurality of detecting portions are connected in series, and the displaying portion is configured to display the presence or absence of information communication, based on an overall output voltage of the plurality of detecting portions connected in series.
    Type: Grant
    Filed: October 31, 2015
    Date of Patent: July 18, 2017
    Assignee: HITACHI METALS, LTD.
    Inventors: Yohei Shirakawa, Koki Hirano, Yoshitake Ageishi
  • Patent number: 9599641
    Abstract: The current detection device includes a plurality of air-cored coils respectively attached to conductors for a plurality of phases, which are supported by an insulator and housed in a ferromagnetic tank a plurality of output-voltage detection circuits that detect output voltages of the air-cored coils for respective phases; and a correction processing circuit that obtains, by dividing the output voltages of the air-cored coils for respective phases by transformation ratios of the air-cored coils, current value levels, which are temporary values of currents flowing in the conductors for respective phases, calculates the output-voltage correction values for respective phases according to the current value levels of respective phases, and calculates and outputs current flowing in the conductors for respective phases on the basis of the output-voltage correction values.
    Type: Grant
    Filed: November 26, 2012
    Date of Patent: March 21, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shigeo Fujii, Daigo Matsumoto
  • Patent number: 9594098
    Abstract: A magnetic field sensing device can include two or more magnetic field sensors configured to detect a magnetic field in a current carrying conductor. The magnetic field sensing device also can include a phase detector electrically coupled to outputs of the two or more magnetic field sensors. The magnetic field sensing device further can include a phase indicator electrically coupled to the phase detector. The phase indictor can include a display that indicates when the two or more magnetic field sensors are in a position in relation to the current carrying conductor. Other embodiments are provided.
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: March 14, 2017
    Assignee: Belkin International Inc.
    Inventors: Shwetak N. Patel, Sidhant Gupta, Matthew S. Reynolds, Karthik Yogeeswaran
  • Patent number: 9537426
    Abstract: The invention relates to a method for actuating an inverter (10) by means of space vector pulse width modulation, in particular for actuating an electrical machine (14), wherein the inverter (10) has a plurality of controllable switches (S) and is configured to provide a multi-phase electrical voltage (U, V, W) in the form of a voltage space vector (V*), wherein the controllable switches (S) are actuated in such a manner that different duty cycles of the switches (S) are set and a plurality of successive different switching states (V0-V7) of the switches (S) are set up to provide the voltage space vector (V*), wherein the duty cycles of the switches (S) are extended during a pulse width modulation period (T) if a duty cycle of one of the switches (S) falls below a predefined threshold (44) during the pulse width modulation period (T).
    Type: Grant
    Filed: April 24, 2013
    Date of Patent: January 3, 2017
    Assignee: Robert Bosch GmbH
    Inventors: Mark Damson, Thomas Wiecha
  • Patent number: 9471047
    Abstract: This disclosure discloses a motor control apparatus including a current conversion part, a voltage control part, a current detection part, and a current estimation part. The current conversion part generates a voltage command on the basis of a current deviation between a current command and an estimated current. The voltage control part controls an output voltage to a motor. The current detection part detects a motor current. The current estimation part inputs the detected motor current and the voltage command and outputs the motor current in which an influence by a disturbance has been compensated for as the estimated current.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: October 18, 2016
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Yasuhiko Kaku, Tetsuya Asai
  • Patent number: 9377490
    Abstract: A transformer-less method and system for voltage and current sensing using voltage drops across resistors is disclosed. Using optically coupled isolators, the sensed voltages in the high voltage power lines are optically coupled and electrically isolated to the low voltage circuits. The circuit designs for voltage and current sensing's and electrical isolation are disclosed.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: June 28, 2016
    Assignee: INTERNATIONAL TECHNOLOGICAL UNIVERSITY
    Inventor: Karl L. Wang
  • Patent number: 9274149
    Abstract: A system, method, and apparatus are described for monitoring the operation of a three phase system. In some embodiments, one or more vectors may be generated. The vectors may be indicative of an output of the three phase system. In some embodiments, one or more of the vectors may correspond to a difference of two of the three phases of the three phase system. A gain associated with a third of the vectors may be different from a gain associated with each of the first and the second vectors. The gain associated with the third vector may be maximized. The three vectors may be combined with hardware or software. In some embodiments, frequency content associated with the three phase system may be filtered with hardware or software. For example, filtering may be used to remove frequencies outside of a specified frequency range of interest.
    Type: Grant
    Filed: April 16, 2012
    Date of Patent: March 1, 2016
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventor: Evropej Alimi
  • Patent number: 9130472
    Abstract: A single switch PFC power supply (including forward and fly-back power supply) in single stage has two transformers: one forward transformer, one main transformer. The main transformer transfers electrical power from the primary circuit to secondary circuit. The forward transformer is used to correct input current waveform. The two transformer's primary windings are connected in series. An extra winding of the forward transformer, a capacitor and two diodes are formed a no loss snubber circuit to enhance the efficiency of the power supply.
    Type: Grant
    Filed: August 30, 2013
    Date of Patent: September 8, 2015
    Inventor: Fuxiang Lin
  • Publication number: 20150042311
    Abstract: A system for a three-phase electric power system includes a plurality of voltage sensors sensing three-phase voltages of the three-phase electric power system; a plurality of current sensors sensing three-phase currents of the three-phase electric power system; and a number of analog-to-digital converters converting the sensed three-phase voltages and the sensed three-phase currents of the three-phase electric power system to corresponding digital values.
    Type: Application
    Filed: May 1, 2014
    Publication date: February 12, 2015
    Applicant: EATON CORPORATION
    Inventors: ZHI GAO, BRIAN ZACHARY ZAREMSKI, ALAN KENJI HAYASHI
  • Publication number: 20140300344
    Abstract: The present disclosure is a system for monitoring power that has a unified polyphase distribution transformer monitoring (PDTM) device that interfaces with at least three electrical conductors electrically connected to a transformer. In addition, the PDTM device measures a current and a voltage of each of the three electrical conductors. Additionally, the system has logic that calculates values indicative of power corresponding to the transformer based upon the currents and the voltages measured and transmit data indicative of the calculated values.
    Type: Application
    Filed: March 18, 2014
    Publication date: October 9, 2014
    Inventors: Randall Turner, Sergio Angeli, Michael Vandenberg, Lan Xu, John Cecil Kuurstra
  • Patent number: 8823359
    Abstract: This disclosure relates to a three-phase electric energy measurement apparatus, comprising: a voltage detection unit for detecting voltage of each phase in power transmitting lines where the voltage detection unit is; a current detection unit for detecting current of each phase in the power transmitting lines where the current detection unit is; an electric energy calculation unit, connected to said voltage detection unit and said current detection unit, for receiving signals outputted from said voltage detection unit and said current detection unit, and performing signal processing and calculation, and then outputting a calculation result; wherein both said voltage detection unit and said electric energy calculation unit are connected in a star connection mode, forming a common virtual ground. Through the above-mentioned grounding manner different from that in the prior art, a three-phase four-wire electric energy meter is formed using a three-phase three-wire connection method.
    Type: Grant
    Filed: December 11, 2009
    Date of Patent: September 2, 2014
    Assignee: National Institute of Metrology P.R. China
    Inventors: Zhigao Zhang, Zhishou Zheng, Qingchang Qu
  • Publication number: 20140204972
    Abstract: In a method for determining current in a polyphase machine connected to a DC voltage source, a DC link is provided with a DC-link capacitor and, per phase, a high-side switch and a low-side switch. A measurement of the voltage curve across the DC-link capacitor is undertaken. The current of the DC voltage source and/or one or a plurality of phase currents are/is determined from the measured voltage curve.
    Type: Application
    Filed: May 10, 2012
    Publication date: July 24, 2014
    Inventors: Paul Mehringer, Kurt Reutlinger
  • Patent number: 8786273
    Abstract: A high voltage phasing voltmeter comprises first and second probes. Each probe comprises an insulated handheld shield supporting an electrode for contacting a high voltage electrical conductor. The electrode is connected in series with a resistor and a capacitor. A meter comprises a housing enclosing an electrical circuit for measuring phasing voltage. The electrical circuit comprises an input circuit for connection to the first and second probes and an amplifier connected between the input circuit and a display. The amplifier measures voltage across the electrodes to provide an indication on the display.
    Type: Grant
    Filed: September 23, 2010
    Date of Patent: July 22, 2014
    Assignee: Honeywell International, Inc.
    Inventors: Adishesa Cs, Anil Nagpal
  • Publication number: 20140184198
    Abstract: A power monitoring system includes a plurality of current sensors suitable to sense respective changing electrical current within a respective conductor to a respective load and a conductor sensing a respective voltage potential provided to the respective load. A power monitors determines a type of circuit based upon a signal from at least one of the current sensors and a signal from the conductor, wherein the type of circuit includes at least one of a single phase circuit, a two phase circuit, and a three phase circuit. The power meter configures a set of registers corresponding to the determined type of circuit in a manner such that the configuring is different based upon each of the single phase circuit, two phase circuit, and three phase circuit suitable to provide data corresponding to the determined type of circuit.
    Type: Application
    Filed: October 10, 2013
    Publication date: July 3, 2014
    Applicant: Veris Industries, LLC
    Inventors: Martin COOK, Michael BITSCH
  • Publication number: 20140062471
    Abstract: A single-package power meter is disclosed for measuring the power consumed by a load connected to an electrical conductor. The power meter is galvanically isolated from the electrical conductor through the use of magnetic sensors or through the combination of magnetic sensors and capacitors. Instantaneous power consumed at the load and other desired parameters are determined by measuring the voltage of the load and current flowing through the electrical conductor. Current is measured using a magnetic sensor to detect the magnetic field associated with the current flowing through the electrical conductor. Voltage is measured by one of two possible techniques involving magnetic sensors to measure the current flowing through a coil connected in parallel with a load, or through the use of a capacitively coupled voltage divider connected in parallel with the load.
    Type: Application
    Filed: October 26, 2011
    Publication date: March 6, 2014
    Applicant: JIANG SU MULTI DIMENSION TECHNOLOGY CO., LTD
    Inventors: James G. Deak, Insik Jin, Weifeng Shen, Songsheng Xue
  • Patent number: 8636885
    Abstract: An analytical device including a sensor, an analytical circuit, and a power source. The power source includes an optical coupler formed of a light source and a photovoltaic cell for producing an electromotive force in response to light from the light source. The optical coupler is configured to provide the electromotive force to the analytical circuit. The power source may be configured for separation between the power supply and the resulting electromotive force supplied to the analytical circuit. Various aspects of the invention are directed to providing a power source for one or more components of an electrochemical detector. A method of providing power to an analytical instrument is also disclosed.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: January 28, 2014
    Assignee: Dionex Corporation
    Inventors: Martin Vana, William Dale Case
  • Publication number: 20130271114
    Abstract: A system, method, and apparatus are described for monitoring the operation of a three phase system. In some embodiments, one or more vectors may be generated. The vectors may be indicative of an output of the three phase system. In some embodiments, one or more of the vectors may correspond to a difference of two of the three phases of the three phase system. A gain associated with a third of the vectors may be different from a gain associated with each of the first and the second vectors. The gain associated with the third vector may be maximized. The three vectors may be combined with hardware or software. In some embodiments, frequency content associated with the three phase system may be filtered with hardware or software. For example, filtering may be used to remove frequencies outside of a specified frequency range of interest.
    Type: Application
    Filed: April 16, 2012
    Publication date: October 17, 2013
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventor: Evropej Alimi
  • Patent number: 8531179
    Abstract: A device (10) for the detection of current asymmetries in three-phase circuits (L1, L2, L3) is provided. This device (10) has a first current measuring mechanism (S1) for the measurement of first phase (L1) and a second current measuring mechanism (S3) for the measurement of a second phase (L3). Furthermore, the device has a computing unit (ALU) which determines a current symmetry value (N2, 3; N1, 2) of the third phase (L2) relative to the first phase (L1) or second phase (L3) from the measured first phase and from the measured second phase. Moreover, an associated method is also provided.
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: September 10, 2013
    Assignee: Phoenix Contact GmbH & Co. KG
    Inventors: Daniel Hawel, Andre Korrek, Elmar Schaper, Stephan Hansmeier, Lutz Heuer, Bernd Schulz
  • Publication number: 20130103330
    Abstract: Techniques are provided for managing the infrastructure (power distribution chain) of an information technology (IT) facility, sometimes referred to herein as a data center, comprising hierarchically arranged low-level and higher level components. This power distribution chain management occurs at the phase-level (i.e., at each of the phases of power that are utilized in the power distribution chain). In one example, characteristics representing the consumption of power of one or more of the low-level components are obtained. Based on the obtained characteristics, the power consumption for each of a plurality of the higher-level components is determined. Based on the power consumption determined for each of the plurality of higher-level components, a global power consumption, at the phase-level, for the entire power distribution chain is determined at the one or more low-level components.
    Type: Application
    Filed: November 16, 2011
    Publication date: April 25, 2013
    Applicant: CISCO TECHNOLOGY, INC.
    Inventors: Timothy J. Cox, Brian D. Koblenz, Michael J. Lavazza
  • Publication number: 20130035886
    Abstract: A method and an arrangement for voltage measurement with a transformer configuration comprising three single pole voltage transformers having tertiary windings open-delta connected with each other. The arrangement is configured to apply a correction to measured secondary voltages on the basis of one or more parameters of the voltage transformers and/or one or more quantities in a known relation to one or more parameters of the voltage transformers, one or more parameters of a circuit connected to the secondary windings and/or one or more quantities in a known relation to one or more parameters of the circuit connected to the secondary windings, and one or more parameters of a circuit connected to the tertiary windings and/or one or more quantities in a known relation to one or more parameters of the circuit connected to the tertiary windings.
    Type: Application
    Filed: October 9, 2012
    Publication date: February 7, 2013
    Applicant: ABB Technology AG
    Inventor: ABB Technology AG
  • Patent number: 8362759
    Abstract: A phase current prediction method is disclosed. The phase current prediction method predicts current representative of a PWM period using a motor model which receives current measured through a single current sensor as an input, instead of the measured current, and determines the predicted current to be phase current.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: January 29, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jung Ik Ha, Jong Ho Kim, Ho Sun Yoo, Hyung Sun You, Jang Hwan Kim
  • Publication number: 20120286769
    Abstract: A current sensor includes input modules each including an amplifier having a first input coupled to a respective winding of a regulator; a transistor having a control input coupled to the amplifier output, a first terminal coupled to a second input of the operational amplifier, and a second terminal configured to provide a sense current representing an unbalance of a phase current with respect to an average current of a winding; a current generator configured to bias the transistor; and an output resistor coupling the first terminal to an intermediate node. An output stage includes an output amplifier having a first input coupled to the intermediate node, and an output transistor having a control terminal coupled to the output amplifier output, a first terminal coupled to a second input of the output amplifier, and a second terminal providing another sense current representing a total current of the regulator.
    Type: Application
    Filed: May 11, 2012
    Publication date: November 15, 2012
    Applicant: STMICROELECTRONICS S.R.L.
    Inventor: Giuseppe Torti
  • Publication number: 20120176103
    Abstract: A voltage-converter and a signal processing circuit are disclosed. A voltmeter, a power meter and a three-phase meter each including the voltage-converter and the signal processing circuit are disclosed. Methods of making the voltage-converters, voltmeters, three phase meters and power meters, as well as operating and/or using these apparatus are disclosed. Apparatus including feedback paths with at least one voltage-converters, voltmeters, three-phase meters and/or power meters are disclosed.
    Type: Application
    Filed: September 3, 2010
    Publication date: July 12, 2012
    Applicant: VERIVOLT, LLC
    Inventors: Juan Lizarazo, Ram Rajagopal
  • Publication number: 20120169323
    Abstract: Congruent power and timing signals in a single electronic device. In an embodiment, a circuit may include just one isolation transformer operable to generate a power signal and a timing signal. On the secondary side, two branches may extract both a power signal and a clock signal for use in the circuit on the isolated secondary side. The first branch may be coupled to the transformer and operable to manipulate the signal into a power signal, such as a 5V DC signal. Likewise, the second circuit branch is operable to manipulate the signal into a clock signal, such as a 5 V signal with a frequency of 1 MHz. By extracting both a power supply signal and a clock signal from the same isolation transformer on the secondary side, valuable space may be saved on an integrated circuit device with only having a single winding for a single isolation transformer.
    Type: Application
    Filed: December 22, 2011
    Publication date: July 5, 2012
    Applicant: STMICROELECTRONICS (SHENZHEN) R&D CO. LTD.
    Inventors: Henry GE, Welsin WANG, Xing ZHANG
  • Publication number: 20120056613
    Abstract: A device (10) for the detection of current asymmetries in three-phase circuits (L1, L2, L3) is provided. This device (10) has a first current measuring mechanism (S1) for the measurement of a first phase (L1) and a second current measuring mechanism (S3) for the measurement of a second phase (L3). Furthermore, the device has a computing unit (ALU) which determines a current symmetry value (N2, 3; N1, 2) of the third phase (L2) relative to the first phase (L1) or second phase (L3) from the measured first phase and from the measured second phase. Moreover, an associated method is also provided.
    Type: Application
    Filed: September 7, 2011
    Publication date: March 8, 2012
    Applicant: PHOENIX CONTACT GMBH & CO. KG
    Inventors: DANIEL HAWEL, ANDRE KORREK, ELMAR SCHAPER, STEPHAN HANSMEIER, LUTZ HEUER, BERND SCHULZ
  • Publication number: 20120023994
    Abstract: A surge protector, an HVAC unit including the surge protector and a method of testing electrical equipment employing the surge protector is disclosed. In one embodiment, the surge protector includes: (1) a first lead, a second lead and a third lead and (2) a protective network having three surge protection units with one of the three surge protection units coupled between each distinct combination of the first, second and third leads, the protective network configured to provide simultaneous surge protection between each of the distinct combinations.
    Type: Application
    Filed: July 29, 2010
    Publication date: February 2, 2012
    Applicant: Lennox Industries, Incorporated
    Inventor: Joe Ray Powell
  • Patent number: 8093748
    Abstract: The Universal Power Inlet System, or UPIS, is a method of providing universal attachment of 3 different types of electrical power systems into the input circuitry of a Power Distribution Unit, or PDU. This method allows use of either fixed or detachable power cord options permitting the PDU to be powered by any of the following types of electrical power sources: 3-Phase Delta, 3-Phase Star (or Wye) and Single-Phase. This method also describes a way to uniquely identify the specific power system the mentioned PDU is currently attached to. The method also optionally allows derivation of supplementary information about the electrical power system such as current capacity, or ampacity, of the power cord being used. All this information can be used for capacity monitoring and reporting as well as protection of PDU circuitry and power cords.
    Type: Grant
    Filed: October 8, 2008
    Date of Patent: January 10, 2012
    Assignee: Avocent Huntsville Corporation
    Inventor: Carlos E. Martins
  • Patent number: 8067932
    Abstract: This invention deals with an advanced Real-time Grid Monitoring System (RTGMS) suitable for both single-phase and three-phase electric power systems. This invention provides an essential signal processing block to be used as a part of complex systems either focused on supervising and diagnosing power systems or devoted to control power processors interacting with the grid. This invention is based on a new algorithm very suitable for real-time characterization of the grid variables under distorted and unbalanced grid conditions. The main characteristic of this invention is the usage of a frequency-locked loop, based on detecting the grid frequency, for synchronizing to the grid variables. It results in a very robust system response in relation to existing technique based on the phase-angle detection since grid frequency is much more stable variable than the grid voltage/current phase-angle, mainly during grid faults.
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: November 29, 2011
    Assignee: Gamesa Innovation & Technology, S.L.
    Inventors: Remus Teodorescu, Pedro Rodriguez
  • Publication number: 20110267032
    Abstract: This disclosure relates to a three-phase electric energy measurement apparatus, comprising: a voltage detection unit for detecting voltage of each phase in power transmitting lines where the voltage detection unit is; a current detection unit for detecting current of each phase in the power transmitting lines where the current detection unit is; an electric energy calculation unit, connected to said voltage detection unit and said current detection unit, for receiving signals outputted from said voltage detection unit and said current detection unit, and performing signal processing and calculation, and then outputting a calculation result; wherein both said voltage detection unit and said electric energy calculation unit are connected in a star connection mode, forming a common virtual ground. Through the above-mentioned grounding manner different from that in the prior art, a three-phase four-wire electric energy meter is formed using a three-phase three-wire connection method.
    Type: Application
    Filed: December 11, 2009
    Publication date: November 3, 2011
    Inventors: Zhigao Zhang, Zhishou Zheng, Qingchang Qu
  • Patent number: RE46180
    Abstract: Three bridge circuits (101, 111, 121), each include magnetoresistive sensors coupled as a Wheatstone bridge (100) to sense a magnetic field (160) in three orthogonal directions (110, 120, 130) that are set with a single pinning material deposition and bulk wafer setting procedure. One of the three bridge circuits (121) includes a first magnetoresistive sensor (141) comprising a first sensing element (122) disposed on a pinned layer (126), the first sensing element (122) having first and second edges and first and second sides, and a first flux guide (132) disposed non-parallel to the first side of the substrate and having an end that is proximate to the first edge and on the first side of the first sensing element (122). An optional second flux guide (136) may be disposed non-parallel to the first side of the substrate and having an end that is proximate to the second edge and the second side of the first sensing element (122).
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: October 18, 2016
    Assignee: EVERSPIN TECHNOLOGIES, INC.
    Inventors: Phillip Mather, Jon Slaughter, Nicholas Rizzo