With Controlled Power Conversion Patents (Class 318/800)
  • Patent number: 10698031
    Abstract: A method for conducting testing of an electric motor to obtain performance curves, including locked rotor data, is provided.
    Type: Grant
    Filed: February 1, 2019
    Date of Patent: June 30, 2020
    Inventor: R. Gene Smiley
  • Patent number: 10699543
    Abstract: A method for operating a self-propelled cleaning device, in particular a vacuuming and/or wiping robot, the cleaning device traveling in one or more rooms on the basis of a stored room map and, if necessary, carrying out cleaning jobs. The cleaning device furthermore receives information from a fire sensor, in particular initiates an emergency call in the event of a fire alarm. In order to devise a method which offers active help to individuals present in the rooms, the cleaning device, in the event of a fire alarm, outputs an acoustic and/or optical signal and moves toward an emergency exit or toward a safe location starting from its current location.
    Type: Grant
    Filed: May 10, 2016
    Date of Patent: June 30, 2020
    Assignee: Vorwerk & Co. Interholding GmbH
    Inventor: Pia Hahn
  • Patent number: 10658963
    Abstract: A method for regulating operation of an induction motor having a rotor includes calculating a rotor flux angle error value, via a flux observer of a controller, using estimated d-axis and q-axis flux values of the rotor, estimating rotor position using a position observer of the controller, and calculating slip position of the rotor using d-axis and q-axis stator currents. The method also includes estimating a rotor flux angle as a function of slip position and estimated rotor position, calculating a corrected rotor flux angle by selectively adding the rotor flux angle error value to the estimated rotor flux angle, and controlling output torque of the motor using the corrected rotor flux angle. A logic switch may be used to selectively add the rotor flux angle.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: May 19, 2020
    Assignee: GM Global Technology Operations LLC
    Inventors: Anno Yoo, Nathan Minor
  • Patent number: 10646995
    Abstract: A control device repeats learning of: calculating an allowable condition for speed variations during a processing operation based on an allowable condition for processing error; setting an operating speed change rate used to increase or reduce an operating speed of a robot mechanism unit using a calculated allowable condition for speed variations; and, while increasing or reducing the operating speed change rate over a plurality of repetitions within a range not exceeding a maximum value of the operating speed change rate and within a range of an allowable condition for vibrations occurring in a control target, calculates a new correction amount based on an amount of difference between a position of the control target detected based on a sensor and a target position, and a previously-calculated correction amount.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: May 12, 2020
    Assignee: FANUC CORPORATION
    Inventors: Shinichi Washizu, Hajime Suzuki, Kaimeng Wang
  • Patent number: 10615591
    Abstract: A power electronics unit for driving an electric machine excited by permanent magnets and including a rotor and a stator having at least one stator winding, comprising at least one power switch designed to drive the stator winding, and an overvoltage protection device to protect the power switch from overvoltage. The overvoltage protection device comprises a phase voltage detecting device associated with the power switch as well as a short-circuit switching circuit which, when a predetermined phase voltage threshold value of the phase voltage detected by the phase voltage detection device is reached or exceeded, is adapted to be activated for short-circuiting the stator winding associated with the power switch. The short-circuit switching circuit comprises the power switch designed to drive the stator winding.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: April 7, 2020
    Assignee: L-3 COMMUNICATIONS MAGNET-MOTOR GMBH
    Inventors: Peter Ehrhart, Jens Steffen
  • Patent number: 10598399
    Abstract: An air conditioner includes a controller that controls an inverter on the basis of an instruction received by a receiver. The controller includes: a rotational speed acquisition unit that acquires a specific rotational speed corresponding to a combination of an air volume and an air speed; a correction value acquisition unit that acquires a specific correction value by determining an operation mode, presence or absence of a power saving mode, and presence or absence of a sleeping mode; and a selection unit that selects three-phase operation when the specific rotational speed is lower than a threshold calculated by adding the specific correction value to a fixed value, or selects two-phase operation when the specific rotational speed is higher than or equal to the threshold.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: March 24, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventor: Tomomi Miyata
  • Patent number: 10601356
    Abstract: This invention provides a frequency converter and bypass frequency conversion control system, and its switching control method, belonging to the technical field of motor drive control. The frequency converter of this invention accesses a network voltage signal with a corresponding first frequency and first phase, wherein the frequency converter is configured to be able to operate in tracking and synchronization mode, and in tracking and synchronization mode, the frequency converter tracks the first frequency and first phase of the network voltage signal in order to basically synchronize the second frequency and second phase of its output voltage signal with the first frequency and corresponding first phase of the network voltage signal. The frequency converter of this invention achieves simple, low cost, fast synchronization with good synchronism.
    Type: Grant
    Filed: September 12, 2018
    Date of Patent: March 24, 2020
    Assignee: OTIS ELEVATOR COMPANY
    Inventors: Kun Ma, Chen Gao
  • Patent number: 10576628
    Abstract: A machine learning device of a controller observes data on a movement speed of each motor of a robot and an adjustment amount of the movement speed, a target speed of a tip end of the robot, and a movement path proximate to the tip end of the robot, as state variables expressing a current state of an environment, and acquires determination data indicating an appropriateness determination result of the movement speed of the tip end of the robot. Then, the machine learning device learns the target speed data, the movement speed data, and the movement path data in association with the adjustment amount of the movement speed of each of the motors of the robot by using the observed state variables and the acquired determination data.
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: March 3, 2020
    Assignee: Fanuc Corporation
    Inventor: Tetsuji Ueda
  • Patent number: 10574169
    Abstract: API duty calculation unit of a microcomputer that performs control at a predetermined control period calculates a duty ratio of a voltage applied to a coil of a motor from a target rotation speed and an actual rotation speed calculated by a number-of-rotation information unit. The PI duty calculation unit generates a rectangular wave signal having a period according to one frequency selected from plural predetermined frequencies together with the start of one control period and indicating the calculated duty ratio, and outputs the rectangular wave signal to a PWM duty calculation unit. The PWM duty calculation unit generates a PWM signal for controlling an inverter circuit based on the rectangular wave signal output by the PI duty calculation unit and position information of a rotor of the motor calculated by an electrical angle position information unit.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: February 25, 2020
    Assignee: DENSO CORPORATION
    Inventor: Hikaru Otsuka
  • Patent number: 10520540
    Abstract: A survey voltage transmitter includes a diode, a resistor, a first connection wire connected to a hot wire of AC power at a place, a second connection wire connected to a neutral wire of the AC power, a switching unit for turning on/off a circuit connected between the hot wire and the neutral wire to control a current flow through the diode and the resistor connected in series, a switching control unit for controlling a switch time of the circuit by providing a time control signal to the switching unit to turn on the circuit at a predetermined phase angle of the AC power and turn off the circuit before a half wave extinction phase angle of the AC power, and a coding unit for controlling the switching control unit to generate the current flow or not and for generating a series of logic values corresponding to the current flow.
    Type: Grant
    Filed: December 6, 2017
    Date of Patent: December 31, 2019
    Inventor: Hyun Chang Lee
  • Patent number: 10502787
    Abstract: An apparatus and a method for testing a stator core of a generator are presented. The apparatus includes a power supply. The power supply provides an excitation current having a base frequency. A frequency convertor is connected to the power supply. The frequency convertor converts the base frequency of the excitation current to an excitation frequency that is greater than the base frequency. An excitation cable connects the frequency convertor to a rotor at two axial ends. The rotor is excited by the excitation current with the excitation frequency as a single excitation winding for simulating an operation state of the generator causing hot spots on the stator core without overheating the rotor.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: December 10, 2019
    Assignee: SIEMENS ENERGY, INC.
    Inventors: Gustavo Gamboa, James F. Lau
  • Patent number: 10476409
    Abstract: A synchronization control system includes: a first slave station; a second slave station; and a master station, wherein the master station includes: a first command data generating unit that generates the first command data; a feedback data filter that extracts and outputs a frequency component in a first frequency domain from feedback data; a command data filter that extracts and outputs a frequency component in a second frequency domain higher than the first frequency domain from the first command data; an adding unit that adds data output from the feedback data filter and data output from the command data filter, and outputs addition data that is a result of the addition; and a second command data generating unit that generates the second command data on the basis of the addition data.
    Type: Grant
    Filed: April 12, 2017
    Date of Patent: November 12, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Ko Kosaka, Bampei Kaji
  • Patent number: 10355616
    Abstract: The invention relates to an electromechanical assembly comprising: an alternator with a wound rotor; a regulator acting on the excitation of the alternator; a rectifier at the outlet of the alternator, supplying a rectified voltage to a continuous bus; and a booster circuit connected by means of a filter to the outlet of the alternator and supplying a voltage to the continuous bus.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: July 16, 2019
    Assignee: MOTEURS LEROY-SOMER
    Inventors: Christian Andrieux, Daniel Ehanno
  • Patent number: 10312848
    Abstract: A method for checking an operation of an electric machine, which has three phases. For pulses of a first electric variable of the three phases, a pulse width modulation is carried out. Depending in each case on a positioning of electromechanical components of the electric machine with respect to one another, the first electric variable has a pulse with a longest pulse width for a first of the three phases, a pulse with an intermediate pulse width for a second of the three phases, and a pulse with a shortest pulse width for a third of the three phases. A cycle of the pulse width modulation is delimited by two points in time.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: June 4, 2019
    Assignee: AUDI AG
    Inventors: Nico Schobeß, Mohamed Hammam
  • Patent number: 10239517
    Abstract: A controller of a hybrid vehicle includes: a control unit configured to activate a starter device for starting any one of a drive motor and an engine by stepping up electric power from a battery by a voltage transformer. The control unit includes a limitation part that limits passing power of the voltage transformer when the temperature of the voltage transformer rises, and a calculation part that obtains a maximum electric power that can be supplied to the drive motor when the starter device is activated, by subtracting a consumed power of the starter device from limited power during limitation of passing power by the limitation part. The control unit activates the starter device and starts the engine, when required power of the drive motor reaches the maximum electric power calculated by the calculation part during limitation of passing power by the limitation part.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: March 26, 2019
    Assignee: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
    Inventors: Naoki Miyamoto, Norihiko Ikoma, Makoto Kamachi, Ryo Shimizu, Hironori Abe
  • Patent number: 10215784
    Abstract: A measuring system, during a measurement process thereof, uses a phase-locked loop mechanism of a stator phase voltage and a stator phase current of a three-phase AC motor to effectively remove harmonics and to sense and obtain the amplitude effective values of the phase voltage and the phase current of the three-phase AC motor and the phase difference between the phase voltage and phase current. Therefore, the measuring apparatus is capable of quickly and accurately calculating the input power of the motor without having to measure the parameters of the motor.
    Type: Grant
    Filed: December 6, 2017
    Date of Patent: February 26, 2019
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Chun-Han Chen, Chun-Hsiang Yang, Yung-Jen Cheng, Ming-Fa Tsai, Ying-Che Weng
  • Patent number: 10177553
    Abstract: A power switching control apparatus includes a current measurement unit that measures the current of a main circuit; a current estimation unit that detects a fault current on the basis of a current measurement value and estimates a future current waveform on the basis of a current waveform measured in a given duration after the detection; a target opening time determination unit that uses a current zero point obtained from the estimated current waveform, a predicted opening time, and a given minimum arc duration so as to determine a time by subtracting a sum of the opening time and the minimum arc duration from the current zero point as the target opening time; and an opening control unit that waits until the nearest one of the target opening times is reached and transmits an interruption control signal when the target opening time is reached.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: January 8, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tomohito Mori, Aya Yamamoto, Daisuke Yoshida
  • Patent number: 10135351
    Abstract: A circuit and method for converting an input AC voltage of a source to an output AC voltage of a destination is disclosed. The circuit may include a main switch cell coupled to the source, a freewheeling switch cell coupled to the main switch cell, a first inductor coupled to the main switch cell, the freewheeling switch and the destination, and a second inductor coupled to the first inductor, the main switch cell, the freewheeling switch and the destination. The circuit may also include a plurality of current paths when at least one of the main switch cell and/or the freewheeling switch cell is on. In some implementations, the main switch cell and the freewheeling switch cell are controlled using a switching method.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: November 20, 2018
    Inventors: MohammadReza Haji Moradi Javarsiani, Hossein Mokhtari
  • Patent number: 10101146
    Abstract: The invention relates to a method for determining a rotor position of a rotatory, multi-phase, electronically commutated electric machine (1). Said electric machine (1) comprises several phase windings (4) which can be supplied with current by means of phase connectors. Said method consists of the following steps: phase currents and phase connections are identified on phase connections of the electric machine (1); the induced currents on the phase connections of the electric machine (1) are determined from the identified phase currents and phase flows; the identified current indicator of the induced current is provided with respect to a Cartesian coordination system which is fixed to a stator by the induced currents; the position of the rotor is identified as a space indicator angle of the current indicator of the induced current provided with respect to the Cartesian coordination system which is fixed to the stator.
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: October 16, 2018
    Assignee: Robert Bosch GmbH
    Inventors: David Fricker, Alexander Reiss
  • Patent number: 10003292
    Abstract: A system and method for dynamically optimizing flux levels in electric motors based on estimated torque. Motor parameters and motor equations are used to estimate operating characteristics and to set current and voltage limits which define an optimal flux operating range for a given speed and torque of the motor. A slope of a linear flux gain is determined within the defined operating range at different speeds of the motor. The determined slopes for the different speeds are saved in a memory element. A control element determines and achieves an optimal flux level for the motor by accessing the table to identify a specific slope which corresponds to an actual speed of the motor, multiplying the slope by the estimated torque and adding an offset value to determine a phase current component value associated with the optimal flux level, and applying the determined phase current component value to the motor.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: June 19, 2018
    Assignee: Nidec Motor Corporation
    Inventor: Thomas J. Sheahan
  • Patent number: 9985563
    Abstract: Angular speed of a rotor of an induction motor without an encoder for rotor position and speed sensing is controlled by first sensing stator currents and voltages of the induction motor. A dynamic gain estimator is designed by applying a state transformation to a model of the induction motor. A states of the induction motor is estimated by applying the dynamic gain estimator to the currents and the voltages, and then the state is used to control the angular speed of the rotor of the induction motor.
    Type: Grant
    Filed: January 11, 2016
    Date of Patent: May 29, 2018
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Yebin Wang, Scott A Bortoff
  • Patent number: 9970968
    Abstract: The present invention concerns a method of detecting electric variables of a three-phase AC network having a first, a second and a third phase, including the steps of measuring a respective voltage value of the first, second and third phases in relation to a neutral conductor at a first moment in time, transforming the three voltage values of the first moment in time into polar co-ordinates with a voltage amplitude and a phase angle, repeating measurement and transformation for at least one further moment in time, and determining the currently prevailing frequency, voltage amplitude and/or phase angle of at least one of the phases from the voltage values transformed into polar co-ordinates.
    Type: Grant
    Filed: February 10, 2015
    Date of Patent: May 15, 2018
    Assignee: Wobben Properties GmbH
    Inventors: Alfred Beekmann, Volker Diedrichs
  • Patent number: 9966889
    Abstract: Representative implementations of devices and techniques provide optimized control of a three-phase AC motor. A field oriented control (FOC) arrangement uses optimization components and techniques to improve power efficiency of the motor, with fast control response over a full range of motor speeds.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: May 8, 2018
    Assignee: Infineon Technologies AG
    Inventors: Tao Zhao, Arno Rabenstein, Theng Kiong Gan, Choon Keat Kok
  • Patent number: 9954465
    Abstract: A dynamic limitation device of a dynamic output parameter of an electric motor capable of receiving a working setpoint comprises: a generator of a dynamic maximum current proportional to a first working setpoint of the motor to supply the motor to generate a rotating torque of a shaft of the electric motor as a function of the first setpoint, a first estimator of a first dynamic output parameter of the electric motor, and a first dynamic limiter of the first output parameter of the motor, which comprises: a first comparator of the value of the first estimated parameter with a predefined maximum value of the first parameter, a first corrector to generate a first correction current, the value of which depends on the result of the comparison to be added to the dynamic maximum current to supply the motor. A dynamic limitation method implementing this device is provided.
    Type: Grant
    Filed: October 24, 2016
    Date of Patent: April 24, 2018
    Assignee: THALES
    Inventor: Stéphane Guguen
  • Patent number: 9954624
    Abstract: A computer-implemented method for estimating a rotor speed of an alternating current (AC) machine is provided. The method includes determining a stator flux signal based on signals of voltage and current inputs to the AC machine, and determining a rotor flux signal of the AC machine based on the determined stator flux signal. The method includes determining an electrical angle signal based on the determined rotor flux signal, and deriving an electrical frequency signal from the determined electrical angle signal. Subsequently, the method includes sampling the derived electrical frequency signal at a predetermined sampling rate, and storing a predetermined number of sample values. The method further includes evaluating a median value of the predetermined set of electrical frequency sample values, determining a slip frequency value of the AC machine, and determining the rotor speed of the AC machine by subtracting the slip frequency value from the electrical frequency median value.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 24, 2018
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Ali M. Bazzi, Philip T. Krein
  • Patent number: 9941793
    Abstract: A voltage regulator includes circuitry for regulating a voltage output of the voltage regulator and a snubber circuit. The snubber circuit includes a switching device which is controlled to electronically connect or disconnect the snubber circuit with the circuitry of the voltage regulator device. The switching device may be controlled by a controller based on one or more parameters indicating a load of the voltage regulator device.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: April 10, 2018
    Assignee: DELL PRODUCTS, LP
    Inventors: Shiguo Luo, Hang Li, Kejiu Zhang
  • Patent number: 9929676
    Abstract: Provided is a method of controlling a three phase equivalent voltage in a multilevel inverter including sensing a state of each of power cells of the multilevel inverter to determine whether or not failure occurs at each of the power cells, bypassing power cells which are determined as being failed to connect power cells operating normally to each other in series per each phase, calculating an offset voltage value using a phase voltage reference per each phase and a sum of each of direct current (DC) link voltages of the power cells which operate normally and configure each of the phases, and calculating a pole voltage reference per each phase for maintaining an equivalence of a three phase line-to-line output voltage using the phase voltage reference per each phase and the calculated offset voltage.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: March 27, 2018
    Assignee: LSIS CO., LTD.
    Inventor: Hak-Jun Lee
  • Patent number: 9915687
    Abstract: A real current meter reads current from a current probe coupled around power lines of a transformer-based UPS system coupled to a transformer having a high resistance ground with a HRG resistance and determines a real current component of the current read from the current probe.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: March 13, 2018
    Assignee: Liebert Corporation
    Inventors: James K. Martin, Terry D. Bush, Charles F. Blair
  • Patent number: 9793822
    Abstract: A method for operating an electrical circuit, in particular of a converter is described. The circuit, in at least one embodiment, includes a line-side converter that is coupled to a capacitor. The line-side converter includes at least two series connections, each including at least two power semiconductor elements, and each of the at least two series connections being connected parallel to the capacitor. The line-side converter is coupled to an energy supply system. The DC voltage that is present at the capacitor is determined. A maximum voltage is predetermined. If the DC voltage present at the capacitor is determined to be greater than the maximum voltage, then at least two of the power semiconductor elements are switched into their conductive state in such a manner that the capacitor is discharged in the direction of the energy supply system.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: October 17, 2017
    Assignee: GE Energy Power Conversion Technology Limited
    Inventors: Marco Boni, Christoph Saniter
  • Patent number: 9787174
    Abstract: A converter including a converter control for a wind turbine and a chopper, wherein the converter control includes a dynamic limit value which is allowable for a first tolerance time and a static limit value of the converter. Furthermore, an overcurrent module is provided which includes a limit value expander which is designed to increase the static limit value by a portion of the difference from the dynamic limit value as additional current, and a dynamic module which interacts with the limit value expander in such a way that overcurrents between the static limit value which is increased by the additional current and the dynamic limit value are routed in a first stage to the converter and in a second stage at least partially to the chopper, wherein a switch is made to the second stage after a second tolerance time.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: October 10, 2017
    Assignee: SENVION SE
    Inventors: Heinz-Hermann Letas, Malte Mohr
  • Patent number: 9584057
    Abstract: A control device and a control method can improve a voltage utilization ratio of an inverter for a green car, in which an input DC voltage of the inverter is modulated by a maximum amount into an output AC voltage of the inverter by changing the output AC voltage incapable of being linearly output into a voltage capable of being linearly output. The control method includes steps of: generating a two-phase current command having two phases of a first current command and a second current command; generating a two-phase voltage command having two phases of a first voltage command and a second voltage command; generating a three-phase pole voltage command; modulating the three-phase pole voltage command into a linear output voltage capable of being linearly output; and calculating a voltage gain value, using the two-phase voltage command and an input DC voltage of the inverter.
    Type: Grant
    Filed: December 13, 2014
    Date of Patent: February 28, 2017
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Sung Kyu Kim, Mu Shin Kwak, Hong Geuk Park, Su Hyun Bae
  • Patent number: 9444383
    Abstract: Electromagnetic state variables of an electromagnetic machine are represented by space vectors. A setpoint value for the vector of a manipulated voltage at the stator is preset and an actual value of the vector of the current at the stator is measured. A vector of an induced voltage is determined from the setpoint value and the actual value of the vector of the current. A value of a vector of the magnetic flux is estimated from a preset correction voltage and the induced voltage. A phase angle and a rotating field frequency are estimated from the vector of the magnetic flux. A factor is multiplied into the vector of the correction voltage when a torque-forming component of a current at the stator has an opposite mathematical sign to the estimated value of the rotating field frequency.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: September 13, 2016
    Assignee: Baumueller Nuernberg GmbH
    Inventor: Rastislav Uhrin
  • Patent number: 9395415
    Abstract: A method and apparatus are provided for off-line testing of a multi-phase alternating current machine. A method includes determining, at a first rotor position, a physical stator quantity of each stator winding by applying a test signal to each stator winding, and determining a first joint physical stator quantity by summing the determined physical stator quantities of the stator windings. A method includes determining, at a second rotor position, a physical stator quantity of each stator winding by applying a test signal to each stator winding, determining a second joint physical stator quantity by summing the determined physical stator quantities of the stator windings, comparing the second joint physical stator quantity with a previously determined first joint physical stator quantity, and determining a fault condition of said multi-phase alternating current machine if the first joint physical stator quantity differs from the second joint physical stator quantity.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: July 19, 2016
    Assignee: SUBEE RAA AB
    Inventor: Boris Cop
  • Patent number: 9374013
    Abstract: A power conversion apparatus includes a plurality of power supply circuits each including a primary side circuit, and a secondary side circuit that is magnetically coupled to the primary side circuit via a transformer. Electrical power that changes according to a phase difference between switching of the primary side circuit and switching of the secondary side circuit is input and output to and from the power supply circuit. The power conversion apparatus includes a first power supply circuit, a second power supply circuit that uses, as an input side thereof, an output side of the first power supply circuit, and a control unit that adjusts residual power obtained by subtracting input power of the second power supply circuit from output power of the first power supply circuit, by controlling a phase difference of the first power supply circuit and a phase difference of the second power supply circuit.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: June 21, 2016
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Jun Muto
  • Patent number: 9362815
    Abstract: A method includes controlling multiple networked input-parallel/output-parallel inverters of a fuel cell system as a single inverter assembly by a master controller. A fuel cell system includes a plurality of fuel cell segments, a plurality of DC/DC converters and at least one DC/AC inverter, where an output of each of the plurality of the fuel cell segments is connected to a pair of DC/DC converters, and each of the pair DC/DC converters is connected to an opposite polarity bus being provided to the inverter.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: June 7, 2016
    Assignee: BLOOM ENERGY CORPORATION
    Inventors: Ranganathan Gurunathan, Aisur Gopalakrishnan Vishal Anand, Ame Ballantine, Saravanakumar Narayanasamy, Kodali Venkata Narasimha Rao
  • Patent number: 9318991
    Abstract: A method and apparatus for controlling an electric motor. A switching frequency meeting a desired operating condition is identified from information relating to operation of the electric motor. A switching of a current supplied to the electric motor with the switching frequency identified is controlled.
    Type: Grant
    Filed: April 11, 2013
    Date of Patent: April 19, 2016
    Assignee: THE BOEING COMPANY
    Inventors: Christopher Pete Benson, Douglas C. Cameron, Peng Zeng
  • Patent number: 9312801
    Abstract: A brushless electrical machine has at least one phase winding which produces torque to drive a load. The control system for the machine is able to vary the flux and current supplied to a phase so as to vary the torque output as a function of the rotor position. The energization is reduced at particular angles to produce a dip in the torque profile, thus ensuring that, if the drive stalls, it does so at a predetermined position, for example where the losses in the drive are minimized.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: April 12, 2016
    Assignee: NIDEC SR DRIVES, LTD
    Inventors: Steven Paul Randall, Mark John Cherney
  • Patent number: 9294019
    Abstract: Power converters and methods are presented for driving an AC load connected through an intervening filter circuit, in which at least one filter current or voltage signal or value is determined according to feedback signals or values representing an output parameter at an AC output of the power converter, and AC electrical output power is generated at the AC output based at least partially on the at least one filter current or voltage signal or value.
    Type: Grant
    Filed: November 28, 2014
    Date of Patent: March 22, 2016
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Jingbo Liu, Thomas Nondahl, Peter Schmidt, Semyon Royak, Jingya Dai, Ehsan Al-Nabi
  • Patent number: 9270223
    Abstract: At least one example embodiment discloses a control device for controlling an alternating current (ac) machine. The control device includes a processor configured to select a modulation mode from a plurality of modulation modes, determine a plurality of present phase voltages corresponding to phases of an inverter based on the selected modulation mode, the determination compensating for deadtimes associated with the selected modulation mode and phases of the inverter, the inverter configured to drive the ac machine and determine an estimated terminal voltage based on the plurality of present phase voltages.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: February 23, 2016
    Assignee: DEERE & COMPANY
    Inventors: Long Wu, Anthony Weber, Lav Thyagarajan
  • Patent number: 9246422
    Abstract: A motor control device includes an energization pattern output portion and an inverter circuit. The energization pattern output portion cyclically outputs a plurality of energization patterns. The inverter circuit selectively connects respective coils provided in a motor to a rectifier circuit according to the output energization pattern. The energization pattern output portion delays the output timing of the energization pattern according to a rotation speed of the motor.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: January 26, 2016
    Assignee: SANYO DENKI CO., LTD.
    Inventors: Yo Muramatsu, Takahisa Toda
  • Patent number: 9219435
    Abstract: A motor control device includes an energization pattern output portion and an inverter circuit. The energization pattern output portion cyclically outputs a plurality of energization patterns. The inverter circuit selectively connects respective coils provided in a motor to a rectifier circuit according to the output energization pattern. The energization pattern output portion delays the output timing of the energization pattern according to a rotation speed of the motor.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: December 22, 2015
    Assignee: SANYO DENKI CO., LTD.
    Inventors: Yo Muramatsu, Takahisa Toda
  • Patent number: 9143077
    Abstract: A conveying system includes: a linear induction motor including a stator provided with a plurality of primary coils arranged along a conveying path and a mover provided movably along the conveying path; one or more first inverters that are provided corresponding to at least one of the primary coils in one or more areas requiring positioning on the conveying path to perform vector control with a sensor; one or more second inverters that are provided corresponding to at least of the primary coils in one or more areas requiring no positioning on the conveying path to perform V/F control; and a controller that is configured to output a speed reference to the first second inverters to control electric supply to the primary coils and to output the speed reference based on a feedback position received from a detector to the first inverter, to perform position control.
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: September 22, 2015
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventor: Koji Hara
  • Patent number: 9130477
    Abstract: A submodule of a high-voltage inverter has a first sub-unit with a first energy storage device, a first series circuit of two power semiconductor switching units connected in parallel with the first energy storage device, each including a switchable power semiconductor, having the same pass-through direction, and each being conductive opposite the nominal pass-through direction. A first connection terminal is connected to the potential point between the power semiconductor switching units of the first series circuit. A second sub-unit has a second energy storage device, a second series circuit of two power semiconductor switching units connected in parallel with the second energy storage device, each including a switchable power semiconductor, having the same pass-through direction, and each being conductive opposite the nominal pass-through direction.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: September 8, 2015
    Assignee: Siemens Aktiengesellschaft
    Inventor: Rainer Marquardt
  • Patent number: 9124140
    Abstract: Embodiments according to the present invention provide methods and a system for a control approach that effectively maintains the DC link voltage at a constant set value under variable system conditions and keeps the converter operating with an optimal power factor range while limiting power quality effects and phase balance.
    Type: Grant
    Filed: March 29, 2010
    Date of Patent: September 1, 2015
    Assignee: The Board of Trustees of the University of Alabama
    Inventors: Shuhui Li, Tim A. Haskew
  • Patent number: 9124207
    Abstract: A control unit controls driving of a motor by controlling a first inverter unit and a second inverter unit, specifically by controlling on/off operations of FETs. The control unit functions as an abnormality detection device. The control unit detects a short-circuit abnormality between a first winding set and a second winding set or between the first inverter unit and the second inverter unit, before starting to control driving of the motor, based on phase current values detected by current detectors when a high-side FET of the first inverter unit and a low-side FET of the second inverter unit are turned on.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: September 1, 2015
    Assignee: DENSO CORPORATION
    Inventor: Jirou Hayashi
  • Patent number: 9112427
    Abstract: A method for operating an electrical circuit, in particular of a converter is described. The circuit, in at least one embodiment, includes a line-side converter that is coupled to a capacitor. The line-side converter includes at least two series connections, each including at least two power semiconductor elements, and each of the at least two series connections being connected parallel to the capacitor. The line-side converter is coupled to an energy supply system. The DC voltage that is present at the capacitor is determined. A maximum voltage is predetermined. If the DC voltage present at the capacitor is determined to be greater than the maximum voltage, then at least two of the power semiconductor elements are switched into their conductive state in such a manner that the capacitor is discharged in the direction of the energy supply system.
    Type: Grant
    Filed: June 27, 2012
    Date of Patent: August 18, 2015
    Assignee: GE Energy Power Conversion Technology Limited
    Inventors: Marco Boni, Christoph Saniter
  • Patent number: 9099935
    Abstract: A voltage source inverter comprises a rectifier having an input for receiving single-phase AC power from an AC source and converting the AC power to DC power on a DC bus. The DC bus has first and second rails to provide a relatively fixed DC voltage. A DC bus capacitor is across the first and second rails to smooth voltage ripple. An inverter receives DC power from the DC bus and converts the DC power to AC power. An active front end circuit comprises a pair of filter capacitors in series across the first and second rails to create a midpoint. A bidirectional switch is connected between the rectifier input and the midpoint. The bidirectional switch is controlled to inject current into the midpoint of the DC bus.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: August 4, 2015
    Assignee: Yaskawa America, Inc.
    Inventor: Mahesh M. Swamy
  • Patent number: 9088213
    Abstract: A method for the phase diagnosis of a multiphase converter for detecting potential errors in individual converter phases is provided, wherein a symmetrical load distribution for the individual converter phases is regulated. During the operation of the converter, the distribution of the load prescribed for each individual phase of the converter is detected at least two different times, at different temperatures, and in any order.
    Type: Grant
    Filed: February 14, 2011
    Date of Patent: July 21, 2015
    Assignee: CONTINENTAL AUTOMOTIVE GMBH
    Inventor: Gerhard Fuchs
  • Patent number: 9077268
    Abstract: In one embodiment, there is provided a controller that performs control to supply driving electricity to a secondary winding of a variable-speed generator-motor from a secondary exciter and thereby start the variable-speed generator-motor from a standstill state in a variable-speed pumped storage system. The controller performs control to complete a start-up by the driving electricity from the secondary exciter and connect the variable-speed generator-motor in parallel with an electric power system, in a state where a rotating speed of the variable-speed generator-motor is lower than a lower limit speed of a variable-speed operation range.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: July 7, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Teruyuki Ishizuki
  • Patent number: 9024563
    Abstract: A pitch drive circuit that operates in an emergency mode, for a wind or water power plant. The circuit has at least one rectifier unit, at least one DC intermediate circuit, two inverter units and a pitch rotary current motor with motor trains that can be contacted on both sides. A first contact side of the motor trains is connected to a first inverter unit and a second contact side of the motor trains is connected to a second inverter unit. At least one switching element is connected to at least one contact side of the motor trains. In a normal operating mode of a first switching state of the switching element the motor trains can be energized via both inverter units, and in an emergency operating mode of a second switching state of the switching element, the motor trains can be energized via a single inverter unit.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: May 5, 2015
    Assignee: LTi REEnergy GmbH
    Inventors: Andreas Bünte, Harald Wertz, Christian Kleinen, Harry Gill