Pluse Width Modulation Or Chopping Patents (Class 318/811)
  • Patent number: 11491932
    Abstract: An electrified vehicle electrical system includes, among other things, a contactor enclosure, and contactor contacts housed within the contactor enclosure. A resistor is housed within the contactor enclosure or is housed within a relay enclosure outside the contactor enclosure.
    Type: Grant
    Filed: January 22, 2020
    Date of Patent: November 8, 2022
    Assignee: Ford Global Technologies, LLC
    Inventors: Wesley Burkman, Baojin Wang
  • Patent number: 11489467
    Abstract: A motor control apparatus includes control circuitry and rotation direction adjusting circuitry. The control circuitry is configured to output, in accordance with a phase sequence with respect to a motor, a drive command signal which is generated based on a motor rotation signal output from a motor rotation detector to control the motor. The rotation direction adjusting circuitry is configured to match the phase sequence with rotation direction information included in the motor rotation signal if a first trouble signal showing excessive motor current or excessive motor speed is input via an operation unit.
    Type: Grant
    Filed: March 24, 2021
    Date of Patent: November 1, 2022
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventor: Hiroaki Oya
  • Patent number: 11482961
    Abstract: An object of the present invention is to effectively reduce vibration or noise caused by a motor. An inverter circuit 300 generates an alternating current from a direct current supplied from a direct current power supply 10 by using a plurality of IGBTs 311 which are switching elements, supplies the generated alternating current to a motor 100, and drives the motor 100. This alternating current includes a fundamental harmonic current corresponding to a rotational speed of the motor 100, and a harmonic current of a switching operation of the IGBTs 311. A controller 200 controls a second phase such that a first phase and the second phase are not superimposed on each other at a predetermined motor rotational speed, the first phase being a phase of an excitation force cyclically produced in the motor 100 by the fundamental harmonic current, and the second phase being a phase of an excitation force cyclically produced in the motor 100 by the harmonic current.
    Type: Grant
    Filed: January 17, 2018
    Date of Patent: October 25, 2022
    Assignee: HITACHI ASTEMO, LTD.
    Inventors: Katsuhiro Hoshino, Takafumi Hara, Masaru Yamasaki, Yosuke Tanabe, Masanori Watanabe
  • Patent number: 11462946
    Abstract: A first converter performs power conversion and outputs AC power. The AC power outputted from the first converter is supplied to a first coil. The first coil is magnetically coupled with a second coil, and the AC power is transmitted from the first coil to the second coil. A second converter is connected to the second coil, and converts the AC power transmitted to the second coil to DC power and supplies the DC power to a load. A first control unit controls the first converter so as to alternately switch between a first state of outputting rectangular wave voltage which cyclically changes and a second state of outputting constant reference voltage, on the basis of required power of the load.
    Type: Grant
    Filed: July 5, 2019
    Date of Patent: October 4, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takuya Nakanishi, Tomokazu Sakashita
  • Patent number: 11447014
    Abstract: A fault detection device has a pair of power supply lines connected to a high voltage battery via power supply relays. Capacitors and inverters for driving a motor are disposed between the power supply lines. A controller in the fault detection device controls the inverters to discharge the capacitors at different times after the power supply from the battery to motor is stopped by switching OFF the power relays. The controller then determines whether the capacitor voltage has dropped after each capacitor is discharged. Based on the determination result of the voltage drop in each of the capacitors, the controller can determine whether the power supply relays or the capacitors are malfunctioning.
    Type: Grant
    Filed: July 9, 2019
    Date of Patent: September 20, 2022
    Assignee: DENSO CORPORATION
    Inventor: Shingo Takinai
  • Patent number: 11444525
    Abstract: An inverter system includes a level skip prevention control section. The level skip prevention control section is configured to: in response to an upward shift of an output voltage level of a first one of phases, set a counter for inhibiting upward shifting of the output voltage level of the first phase during a predetermined duration, and set a counter for inhibiting downward shifting of an output voltage level of a second one of the phases other than the first phase during a predetermined duration; and in response to a downward shift of the output voltage level of the first phase, set a counter for inhibiting downward shifting of the output voltage level of the first phase during a predetermined duration, and set a counter for inhibiting upward shifting of the output voltage level of the second phase during a predetermined duration.
    Type: Grant
    Filed: March 31, 2020
    Date of Patent: September 13, 2022
    Assignee: MEIDENSHA CORPORATION
    Inventors: Ryuichi Ogawa, Shizunori Hamada
  • Patent number: 11374505
    Abstract: An inverter performs a power conversion operation for converting DC power into AC power, includes an arithmetic control device provided with a voltage command signal generation unit, a synthesis processing unit, and a carrier wave comparison unit. The voltage command signal generation unit has a plurality of control systems, and outputs the first voltage command signal generated based on the first control system among the plurality of control systems, and the second voltage command signal generated based on the second control system different from the first control system among the plurality of control systems. The synthesis processing unit generates a synthesized voltage command signal obtained by synthesizing the first voltage command signal and the second voltage command signal at a predetermined ratio. The carrier wave comparison unit generates a PWM signal which is a gate drive signal for controlling the power conversion operation based on the synthesized voltage command signal.
    Type: Grant
    Filed: July 25, 2019
    Date of Patent: June 28, 2022
    Assignee: HITACHI ASTEMO, LTD.
    Inventors: Takuya Nemoto, Toshiyuki Ajima, Taito Kikuchi
  • Patent number: 11365613
    Abstract: In some examples, an electric submersible pump includes a pump, an electric motor to drive the pump, and a controller. The controller can monitor at one or more terminals of the electric motor a value relating to total harmonic distortion. The controller can also determine whether to de-rate the electric motor in response to the monitoring at the one or more terminals of the electric motor of the value relating to the total harmonic distortion.
    Type: Grant
    Filed: October 22, 2019
    Date of Patent: June 21, 2022
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Michael C. Romer, Stuart G. Luyckx, Matthew J. Tenny
  • Patent number: 11368108
    Abstract: An intermediate circuit current of a power converter is determined as precisely as possible in a simple and inexpensive manner. The intermediate circuit current is determined as a function of a detection of the measured output voltages and output currents of the individual phases.
    Type: Grant
    Filed: April 30, 2021
    Date of Patent: June 21, 2022
    Assignee: IAV GmbH Ingenieurgesellschaft Auto und Verkehr
    Inventors: Michael Homann, Faical Turki
  • Patent number: 11349412
    Abstract: A three-phase AC control apparatus includes: an equal duty sensing circuit; and a PWM signal control circuit. The equal duty sensing circuit senses whether any two of a U-phase, a V-phase, and a W-phase of a three-phase AC current have an equal duty value. The PWM signal control circuit outputs, when it is sensed that any two of the U-phase, the V-phase, and the W-phase of the three-phase AC current have the equal duty value, a control signal that shifts a timing of start and a timing of stop of one of the two phases having the equal duty value.
    Type: Grant
    Filed: December 12, 2019
    Date of Patent: May 31, 2022
    Assignee: NABTESCO CORPORATION
    Inventors: Takashi Ogawa, Takayuki Jinno, Yoshiaki Okuno
  • Patent number: 11342863
    Abstract: An inverter performs a power conversion operation for converting DC power into AC power, includes an arithmetic control device provided with a voltage command signal generation unit, a synthesis processing unit, and a carrier wave comparison unit. The voltage command signal generation unit has a plurality of control systems, and outputs the first voltage command signal generated based on the first control system among the plurality of control systems, and the second voltage command signal generated based on the second control system different from the first control system among the plurality of control systems. The synthesis processing unit generates a synthesized voltage command signal obtained by synthesizing the first voltage command signal and the second voltage command signal at a predetermined ratio. The carrier wave comparison unit generates a PWM signal which is a gate drive signal for controlling the power conversion operation based on the synthesized voltage command signal.
    Type: Grant
    Filed: July 25, 2019
    Date of Patent: May 24, 2022
    Assignee: HITACHI ASTEMO, LTD.
    Inventors: Takuya Nemoto, Toshiyuki Ajima, Taito Kikuchi
  • Patent number: 11290023
    Abstract: A matrix converter system operating in current control mode is provided. The matrix converter includes a switching matrix coupled between a low voltage side and a high voltage side, wherein the matrix converter is coupled at its low voltage side to a generator for receiving an input power including an input current and transforming the input power into an output power at its high voltage side, wherein a load is coupled to the high voltage side. The control system includes a load observer and a model predictive controller (MPC). The load observer is configured to estimate a load current that flows to the load from the high voltage side of the matrix converter as a function of a switching state of the switching matrix, an output voltage output at the high voltage side of the matrix converter, and the input current.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: March 29, 2022
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Vladimir Blasko
  • Patent number: 11277085
    Abstract: An apparatus for controlling a motor may include: an inverter unit configured to output 3-phase AC currents through a plurality of switches to be switched by an input control signal to drive a 3-phase motor; a current detection unit including a plurality of current sensors configured to detect two or more phase currents among the 3-phase AC currents flowing through the 3-phase motor; and a control unit configured to receive respective fed-back phase currents detected by the plurality of respective current sensors, correct the phase currents by applying, to the fed-back phase currents, respective correction gains estimated in advance on the plurality of respective current sensors so as to compensate for a current detection deviation of each of the plurality of respective current sensors, and then control the inverter unit based on the corrected phase currents to control driving of the 3-phase motor.
    Type: Grant
    Filed: November 12, 2019
    Date of Patent: March 15, 2022
    Assignee: HYUNDAI MOBIS CO., LTD.
    Inventors: Hyeon Hee Jeong, Kyu Ha Kim, In Hyuk Kim, Jeong Hoon Seo
  • Patent number: 11239787
    Abstract: A control system and method of controlling a multi-phase electric machine for controlling the flow of electrical current between a voltage source and the multi-phase electric machine or other application/load. The control system includes, between each phase of the multi-phase electric machine and the voltage source: a high side diode and a high side switch positioned in parallel between a positive terminal of the voltage source and the electric machine with the high side diode being reverse biased with regard to the positive terminal; and a low side diode and a low side switch positioned in parallel between a negative terminal of the voltage source and the electric machine with the low side diode being reverse biased with regard to the electric machine. The control system operates the high side and low side switches to provide efficient operation of the electric machine.
    Type: Grant
    Filed: September 3, 2020
    Date of Patent: February 1, 2022
    Assignee: BorgWarner Inc.
    Inventor: Caleb W. Secrest
  • Patent number: 11196378
    Abstract: A motor control device generates three-phase drive currents having a phase difference by combining on-off actions of switching elements and supplies the three-phase drive currents to three-phase coils of a brushless motor. The motor control device includes a drive circuit including a bridge circuit that uses multiple switching elements and a control circuit that sets a control pulse, which causes each of the switching elements to perform on-off actions. The control circuit includes a control pulse generating unit that generates a control pulse. The control circuit further includes a set value retaining unit that retains a set value of an on-time length of the control pulse, which is referred to when the control pulse is generated in the control pulse generating unit. The control circuit further includes a set value changing unit that changes the set value retained in the set value retaining unit.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: December 7, 2021
    Assignee: DENSO CORPORATION
    Inventor: Yukito Suehiro
  • Patent number: 11165359
    Abstract: A power conversion system includes a converter circuit and a control circuit. The control circuit controls, through use of PWM signals, high potential-side switches for a U-phase circuit, a V-phase circuit, and a W-phase circuit, respectively. The control circuit alternately switches between a first modulation method and a second modulation method at each half carrier period of each of the PWM signals. In the first modulation method, the control circuit determines, as a first value, a duty ratio of the PWM signal for one of a U phase, a V phase, and a W phase that has a maximum phase voltage. In the second modulation method, the control circuit determines, as a second value, the duty ratio of the PWM signal for one of the U phase, the V phase, and the W phase that has a minimum phase voltage.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: November 2, 2021
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Fumito Kusama, Takaaki Norisada, Yutaka Kamon
  • Patent number: 11146180
    Abstract: A power converter having a dynamic bus controller to control a rectifier DC output for motoring and regenerating power flow directions, in which the controller controls a DC bus voltage between first and second regenerating voltage limits and limits power at the DC output in an increasing fashion with increasing values of the DC bus voltage according to a regenerating power limit parameter for a regenerating direction of power flow at a DC output. For a motoring direction of power flow at the DC output, the controller controls the DC bus voltage at the DC output between first and second motoring voltage limits and limits the power at the DC output in a decreasing fashion with increasing values of the DC bus voltage according to a motoring power limit parameter.
    Type: Grant
    Filed: November 1, 2019
    Date of Patent: October 12, 2021
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Ahmed S. Mohamed Sayed Ahmed, Steven M. Wirtz, Joseph S. Klak
  • Patent number: 11144031
    Abstract: One example embodiment of the present invention is a control system for an actuator that is controlled by a pulse width modulation (PWM) signal. The control system includes at least two controllers that are connected to the actuator. Each of the controller sends an independent sequence of PWM signal to the actuator. The actuator is controlled by a combination of the PWM signals from all the controllers together. The controllers are synchronized by a clock signal that provides a sequence of periodic clock interval and the PWM signal from each controller occupies a separate and non-overlapping clock interval from the PWM signal of other controllers.
    Type: Grant
    Filed: July 8, 2018
    Date of Patent: October 12, 2021
    Assignee: INSIGHT ROBOTICS LIMITED
    Inventor: Kai Leung Yung
  • Patent number: 11028523
    Abstract: Provided is a laundry treating apparatus having a cleaning nozzle and a method for controlling the cleaning nozzle. The laundry treating apparatus may include a main body having a tub, and a circulation path formed outside the tub to circulate air from the tub along the circulation path outside the tub. A cleaning nozzle may be provided at the circulation path, and configured to inject water. A water supply passage may be provided having one side connected to a water supply source and another side connected to the cleaning nozzle. A water supply valve may be provided to open and close the water supply passage. A controller may control the water supply valve to supply water to the cleaning nozzle. The controller may control the water supply valve to supply water to the cleaning nozzle during a drain course among a plurality of drain courses.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: June 8, 2021
    Assignee: LG ELECTRONICS INC.
    Inventors: Taewan Kim, Hyunchul Choi, Wonjong Kim
  • Patent number: 10998834
    Abstract: A power conversion device is configured to output, to each of two inverters configured to invert a DC voltage output from a DC power supply to three-phase AC voltages, on/off signals for switching on and off respective semiconductor switching elements of each of the inverters so that, out of a plurality of voltage vectors defined so as to correspond to patterns of the on/off signals, the second closest voltage vector and the third closest voltage vector in phase to a voltage command vector that is based on a voltage command value calculated for each of the inverters are formed.
    Type: Grant
    Filed: August 21, 2017
    Date of Patent: May 4, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Mori, Akira Furukawa
  • Patent number: 10985680
    Abstract: A method for controlling an electric motor, the method comprising receiving a command to place the electric motor in a short circuit mode; varying a limit to an available pulse width modulation depth for controlling current flow in the electric motor to a predetermined value over a predetermined time period or at a predetermined rate of change; wherein upon the pulse width modulation depth limit being varied to the predetermined value placing the electric motor in the short circuit mode.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: April 20, 2021
    Assignee: PROTEAN ELECTRIC LIMITED
    Inventor: Timothy John Martin
  • Patent number: 10978985
    Abstract: The control device includes: a unit for receiving, for a time period, phase voltage setpoints forming a setpoint vector in vector space; a unit for selecting at least N+1 states of the inverter which are associated, respectively, with at least N+1 predetermined vectors (M1 . . . M27) defining a volume in the vector space (Esp) containing the setpoint vector; a unit for controlling the inverter, over the time period, in order to place it successively in the selected states so that it substantially applies, on average over the time period, the phase voltage setpoints. The at least N+1 states of the inverter are selected from among groups of at least N+1 states of the inverter, the at least N+1 states of the inverter of at least one of the groups being associated, respectively, with at least N+1 predetermined vectors (M1 . . . M27), at least N of which are formed by predetermined zero-sum phase voltages and at least one of which is formed by predetermined nonzero-sum phase voltages.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: April 13, 2021
    Assignee: VALEO SIEMENS EAUTOMOTIVE FRANCE SAS
    Inventor: Pierre-Alexandre Chauvenet
  • Patent number: 10944352
    Abstract: A boost circuit is arranged to reduce rise and fall times of pulsed power used for pulsed control operation of electric machines. Magnetic energy present in the electric machine at the end of a pulse is extracted by the boost circuit to reduce the pulse fall time. The energy is stored by the boost circuit and then applied at the beginning of a subsequent pulse to reduce the rise time. By reducing rise and fall times compared to not using such a boost circuit, machine efficiency is improved.
    Type: Grant
    Filed: March 13, 2020
    Date of Patent: March 9, 2021
    Assignee: Tula eTechnology, Inc.
    Inventors: Babak Mazda, Adya S. Tripathi, Paul Carvell
  • Patent number: 10892693
    Abstract: A method for controlling an electric motor, implemented in a variable speed drive, the variable speed drive being connected to the electric motor through a transformer, the method including; executing an identification sequence of the transformer for determining gain data corresponding to an inverse function of a transfer function of the transformer; generating a transfer module based on said determined gain data; determining a start-up sequence of the electric motor to be implemented by the variable speed drive by executing the transfer module on a reference current path.
    Type: Grant
    Filed: November 14, 2018
    Date of Patent: January 12, 2021
    Assignee: Schneider Toshiba Inverter Europe SAS
    Inventors: Thomas Devos, Al Kassem Jebai, Francois Malrait
  • Patent number: 10873285
    Abstract: This is to reduce electromagnetic noise while reducing a calculation load of a microcomputer. An inverter drive device according to the present invention switches a first control mode, a second control mode, and a third control mode on the basis of vehicle speed information in a motor control device that controls a power converter that drives a polyphase motor by a PWM pulse signal based on a carrier signal, the first control mode being for updating a command voltage signal to the power converter only on a ridge side or a trough side of the carrier signal, the second control mode being for updating a command voltage signal to the power converter both on a ridge side and a trough side of the carrier signal, and the third control mode being for updating a command voltage signal to the power converter only once of ridge-trough-ridge or trough-ridge-trough of the carrier signal.
    Type: Grant
    Filed: November 10, 2017
    Date of Patent: December 22, 2020
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Takafumi Hara, Toshiyuki Ajima, Katsuhiro Hoshino, Akihiro Ashida, Kazuto Oyama
  • Patent number: 10826410
    Abstract: An object of the present invention is to reduce output voltage errors of an inverter circuit and stably control a motor until the motor reaches high speed rotation. An inverter device includes a PWM controller that generates a PWM pulse for converting DC voltage to AC voltage in accordance with an output request of a motor, and an inverter circuit that converts the DC voltage to the AC voltage with the PWM pulse generated by the PWM controller and drives a motor. The PWM controller changes the pulse width of the PWM pulse at predetermined timing on the upper side of the trapezoidal wave when the trapezoidal wave modulation using the trapezoidal wave is performed in the overmodulation region.
    Type: Grant
    Filed: January 18, 2018
    Date of Patent: November 3, 2020
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Toshiyuki Ajima, Junki Isobe, Midori Takaoka, Akihiro Ashida, Hiroshi Tamura
  • Patent number: 10819249
    Abstract: Disclosed is a method for controlling phase currents of a plurality of three-phase inverters connected in parallel. The phase currents of each inverter are controlled by direct hysteresis current control wherein an actual current space vector for actual values of the phase currents of each inverter is maintained about a target current space vector within a hysteresis window. The measured current space vector of a first inverter is formed by all three phase currents of the first inverter. The actual current space vector of each additional inverter is formed from exactly two phase currents of the respective additional inverter under the proviso that all three phase currents of the additional inverters add up to zero. The selection of the two phase currents from which the actual current space vector is formed, is varied.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: October 27, 2020
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Harald Wiessmann, Bernd Dressel, Maximilian Schmitt
  • Patent number: 10734935
    Abstract: A method is provided for controlling a transition between over-modulation and six-step pulse width modulation (PWM) modes in an electrical system having a polyphase electric machine driven by a polyphase output voltage of a power inverter. The method includes receiving input values via a PWM controller, including a holding angle, rotational speed of the electric machine, and present voltage angle of the power inverter. The method includes calculating a future voltage angle of the inverter using the input values and adjusting pulse widths of a baseline PWM pulse train based on a duty cycle of the power inverter. The power inverter output voltage is controlled during the transition using the adjusted baseline PWM pulse train, such that the transition is continuous. An electrical system includes the power supply, power inverter, electric machine, and the PWM controller, the latter of which is configured to execute the method.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: August 4, 2020
    Assignee: GM Global Technology Operations LLC
    Inventors: Young Joo Lee, Sangyeop Kwak
  • Patent number: 10707778
    Abstract: In a control apparatus, a controller performs comparison between a command voltage and a cyclic carrier signal to thereby perform one of pulse-width modulation upon each of first positive and negative peaks of the command voltage being within or identical to the corresponding one of second positive and negative peaks of the cyclic carrier signal, and single-pulse modulation upon each of the first positive and negative peaks of the command voltage being outside the corresponding one of the second positive and negative peaks of the cyclic carrier signal. The pulse-width modulation generates, for each cycle of the command voltage, plural drive pulses based on a result of the comparison. The single-pulse modulation generates, for each cycle of the command voltage, a single positive pulse and a single negative pulse for each cycle of the command voltage based on a result of the comparison.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: July 7, 2020
    Assignee: DENSO CORPORATION
    Inventors: Kosuke Kondo, Yoo Tanaka, Jun Ishida
  • Patent number: 10630200
    Abstract: A control circuit reduces switching loss by periodically stopping switching elements, and reduces the difference between the time for which positive switching elements are in on state and the time for which negative switching elements are in on state. The control circuit includes a command value signal generator generating command value signals Xu1, Xv1, and Xw1 from line voltage command value signals Xuv, Xvw, and Xwu, and includes a PWM signal generator generating PWM signals by the command value signals Xu1, Xv1, and Xw1. The command value signals Xu1, Xv1, and Xw1 are continuously at “0” for a predetermined period, and are continuously at “2” for another period. This enables reducing the difference between the period for which the PWM signals are low and the period for which they are high.
    Type: Grant
    Filed: July 5, 2019
    Date of Patent: April 21, 2020
    Assignee: DAIHEN Corporation
    Inventors: Nobuyuki Hattori, Akihiro Ohori, Hiroki Munechika
  • Patent number: 10618423
    Abstract: A powertrain for a vehicle includes a Y-wound generator, a Y-wound motor, a generator inverter, a motor inverter, and a traction battery. The Y-wound generator and Y-wound motor are coupled via each respective neutral terminal. The generator inverter is coupled between the Y-wound generator and a generator bus and the motor inverter is coupled between the Y-wound motor and a motor bus. The traction battery has a first terminal coupled to each neutral terminal and a second terminal coupled to bus terminals of the generator and motor bus.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: April 14, 2020
    Assignee: Ford Global Technologies, LLC
    Inventors: Baoming Ge, Lihua Chen, Yan Zhou, Shuitao Yang, Fan Xu
  • Patent number: 10608622
    Abstract: A method of control of an electric motor involves generation of an electrical control signal for the electric motor, the signal having a series of sequences of pulses, each pulse being defined by a width and a period. The ratio of width to period defines a mean electrical power provided to the electric motor by this pulse. The period of a pulse situated at an arbitrary position of a sequence of pulses is equal to the period of the pulse situated at that position of any other sequence of pulses of the series, and the period of each pulse is fixed in a pseudo random manner, such that the inverse of the fixed period lies above the audible acoustic spectrum. The number of pulses of each sequence is fixed so that the inverse of the sum of the periods of all the pulses lies below the audible acoustic spectrum.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: March 31, 2020
    Assignee: Valeo Systemes Thermiques
    Inventors: Philippe Bourdel, Xavier Goumain, Jonathan Fournier, Sylvain Grandyot
  • Patent number: 10575367
    Abstract: A method and system to improve backoff counter handling with relation to a clear channel assessment (CCA) process. The method and system improve a wireless medium availability by adjusting the backoff counter such that the processing of a preamble of a frame received during a backoff is taken into account. Received frames that fall between two CCA thresholds may require decoding of information in the preamble to assess whether the wireless medium is available. A portion of the preamble is decoded that identifies information utilized to determine whether the wireless medium may be considered to be busy. However, during this determination that requires the reading of the preamble of a received frame the backoff counter may be held or decremented even though the wireless medium status is unknown. The method and system provide a set of possible adjustments to the backoff counter to account for this uncertainty and the outcome of the CCA.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: February 25, 2020
    Assignee: NEWRACOM, INC.
    Inventor: Young Hoon Kwon
  • Patent number: 10574253
    Abstract: According to certain aspects, the present embodiments provide a solution for sampling and converting an analog signal at high frequencies but with low power consumption. In some embodiments, a low power, low resolution, AC coupled ADC is used to track the high frequency component of the analog input signal, in parallel with a high resolution ADC to sense the DC signal at a significantly lower sample rate. According to some aspects, the AC coupled ADC requires no reference or a low resolution reference. In these and other embodiments, a plurality of low resolution, low power ADCs having a high sampling rate may be time multiplexed together with a precision ADC at a low sampling rate.
    Type: Grant
    Filed: March 19, 2019
    Date of Patent: February 25, 2020
    Assignee: Renesas Electronics America Inc.
    Inventors: Travis Guthrie, Narendra Kayathi
  • Patent number: 10530280
    Abstract: A motor driving control device includes a motor driving unit to drive the motor, a rotational position detecting circuit for generating rotational position information, and a controller. The controller outputs, to the motor driving unit, a first drive control signal for controlling an adjustment at a time of energization switching to reduce resonance between a natural frequency of the motor and a rotational component of the motor based on the rotational position information when an actual rotational speed of the motor is equal to or higher than a predetermined rotational speed lower than a target rotational speed, and outputs, to the driving unit, a second drive control signal for controlling regular energization switching without performing the adjustment at the time of energization switching when the actual rotational speed is less than the predetermined rotational speed and a set duty is within an error range of a maximum value.
    Type: Grant
    Filed: August 13, 2018
    Date of Patent: January 7, 2020
    Assignee: MINEBEA MITSUMI INC.
    Inventors: Hiroyuki Kaidu, Masato Aoki
  • Patent number: 10513413
    Abstract: A method (70) for controlling a multilevel regenerative drive (30) having a converter (32) and an inverter (34) is disclosed. The method (70) may include applying at least one of unipolar modulation and bipolar modulation to the converter (32), and applying at least one of unipolar modulation and bipolar modulation to the inverter (34). A control system (52) for a mechanical system (20) having a motor (28) is also disclosed. The control system (52) may comprise a converter (32) operatively connected to a power source (29), and an inverter (34) operatively connected to the motor (28) of the mechanical system (20). At least one controller may be in communication with the converter (32) and inverter (34), and may be configured to apply at least one of unipolar modulation and bipolar modulation to each of the converter (32) and the inverter (34).
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: December 24, 2019
    Assignee: OTIS ELEVATOR COMPANY
    Inventors: Ismail Agirman, Shashank Krishnamurthy, Prasanna Nagarajan, Hanjong Kim, Yang Wang
  • Patent number: 10498216
    Abstract: Disclosed is a device for controlling an inverter. The device achieves a minimum switching loss in a discontinuous modulation duration regardless of a power factor. The device includes: a command voltage transform unit configured for transforming each of 3 phases command voltages into each of pole command voltages using the DC stage voltage, a pulse width modulation index, a discontinuous modulation angle corresponding to a discontinuous modulation duration, and each phase difference between each of the 3 phase command voltages and each of 3 phases output currents of the inverting module; and a controller configured for generating a control signal based on a comparison between each pole command voltage and a triangular carrier wave, wherein the control signal controls upper and lower switching elements of each phase leg.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: December 3, 2019
    Assignee: LSIS CO., LTD.
    Inventor: Hak-Jun Lee
  • Patent number: 10469067
    Abstract: A gate driving circuit is connected to a main switching element. The gate driving circuit includes a gate resistor. The gate resistor includes a voltage controlled resistor of which a resistance value is able to be continuously changed. A switching power supply device includes a gate driving circuit, a main switching element, and a freewheeling diode connected in reverse parallel to the main switching element.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: November 5, 2019
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Hirotoshi Kaneda
  • Patent number: 10454359
    Abstract: A method of commutation in a matrix rectifier from an active vector to a zero vector includes two steps. A method of commutation in a matrix rectifier from a zero vector to an active vector includes three steps.
    Type: Grant
    Filed: December 5, 2018
    Date of Patent: October 22, 2019
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Tao Zhao, Dewei Xu, Jahangir Afsharian, Bing Gong, Zhihua Yang
  • Patent number: 10425001
    Abstract: A power switch apparatus for a power converter includes a semiconductor power switch and a gate drive unit connected to the semiconductor power switch for supplying gate drive signals to the semiconductor power switch to switch it on and off to cause the power converter to generate an alternating current voltage having a nominal operational frequency based on command signals received from a controller. The gate drive unit receives command signals based on the AC voltage to be generated and to alter the switching events of the semiconductor power switch by addition of a pre-defined jitter-like deviation to the gate drive signals such as to cause the power converter to generate an AC voltage having a modified operational frequency which partly and temporarily deviates from the nominal operational frequency by a pre-defined minimum percentage. A power converter comprising such a power switch apparatus is also disclosed.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: September 24, 2019
    Assignee: GE Energy Power Conversion Technology Limited
    Inventors: Alvaro Jorge Mari Curbelo, Christof Sihler, Miguel Garcia Clemente, Thomas Alois Zoels
  • Patent number: 10418894
    Abstract: An inverter system includes a rectifier configured to convert a 3-phase AC voltage into a DC voltage, a DC link capacitor configured to smooth the DC voltage into a DC link voltage, an inverter unit configured to convert the DC link voltage into an AC voltage and to output the AC voltage to a motor, and a controller configured to control operation of the inverter unit. The controller performs control to switch the inverter unit to a zero vector when overload is applied during operation of the inverter unit.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: September 17, 2019
    Assignee: LSIS CO., LTD.
    Inventor: Hyo Jin Kim
  • Patent number: 10389269
    Abstract: A control circuit reduces switching loss by periodically stopping switching elements, and reduces the difference between the time for which positive switching elements are in on state and the time for which negative switching elements are in on state. The control circuit includes a command value signal generator generating command value signals Xu1, Xv1, and Xw1 from line voltage command value signals Xuv, Xvw, and Xwu, and includes a PWM signal generator generating PWM signals by the command value signals Xu1, Xv1, and Xw1. The command value signals Xu1, Xv1, and Xw1 are continuously at “0” for a predetermined period, and are continuously at “2” for another period. This enables reducing the difference between the period for which the PWM signals are low and the period for which they are highl.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: August 20, 2019
    Assignee: DAIHEN Corporation
    Inventors: Nobuyuki Hattori, Akihiro Ohori, Hiroki Munechika
  • Patent number: 10374522
    Abstract: The present invention relates to a control method for balancing a neutral point voltage of a three-level circuit, comprising obtaining the neutral point voltage through sampling, adjusting a duty ratio of a zero level in one phase to maintain balance of the neutral point voltage when an absolute value of the neutral point voltage is larger than a threshold value, and distributing duty ratios of positive and negative levels in the phase, such that an output voltage of switch bridge arm in the phase includes positive, negative and zero levels in at least one switch period. The present invention can be carried out in a three-phase four-wire system and a three-phase three-wire system. In the three-phase three-wire system, it may also be combined with zero sequence voltage injection to form a mixed modulation method, thereby acquiring more effective neutral point balance control performance, and reducing switch loss.
    Type: Grant
    Filed: November 7, 2018
    Date of Patent: August 6, 2019
    Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.
    Inventors: Hong Liu, Hao Peng, Cheng Lu
  • Patent number: 10333444
    Abstract: A control system for actively damping an output of an adjustable speed drive (ASD) having a DC link thin film capacitor is programmed to calculate a d-axis damping coefficient and a q-axis damping coefficient for stabilizing an output of the ASD based at least on a voltage across the DC link thin film capacitor at a steady operating point. The control system is further programmed to extract d-axis and q-axis perturbations in d-axis and q-axis output currents of the ASD using a high pass filter, damp the d-axis perturbation and the q-axis perturbation with the d-axis damping coefficient and the q-axis damping coefficient, respectively, and calculate a damping frequency based on the damped d-axis perturbation and the damped q-axis perturbation. The control system is also programmed to damp an angle of rotation of a reference motor speed command for controlling the ASD using the damping frequency.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: June 25, 2019
    Assignees: Eaton Intelligent Power Limited, Zhejiang University
    Inventors: Huaqiang Li, Wenxi Yao, Zhentian Qian
  • Patent number: 10270334
    Abstract: Systems and methods are provided for regulating a power converter. An example system controller includes: a driver configured to output a drive signal to a switch to affect a current flowing through an inductive winding of a power converter, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed in response to the drive signal during the on-time period. The switch is opened in response to the drive signal during the off-time period. A duty cycle is equal to a duration of the on-time period divided by a duration of the switching period. One minus the duty cycle is equal to a parameter. The system controller is configured to keep a multiplication product of the duty cycle, the parameter and the duration of the on-time period approximately constant.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: April 23, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Qian Fang, Cong Lan, Lieyi Fang
  • Patent number: 10199934
    Abstract: Systems and methods are provided for regulating a power converter. An example system controller includes: a driver configured to output a drive signal to a switch to affect a current flowing through an inductive winding of a power converter, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed in response to the drive signal during the on-time period. The switch is opened in response to the drive signal during the off-time period. A duty cycle is equal to a duration of the on-time period divided by a duration of the switching period. One minus the duty cycle is equal to a parameter. The system controller is configured to keep a multiplication product of the duty cycle, the parameter and the duration of the on-time period approximately constant.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: February 5, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Qian Fang, Cong Lan, Lieyi Fang
  • Patent number: 10174980
    Abstract: A method is provided for braking a compressor of a refrigeration appliance, of an air conditioning appliance or of a heat pump in which the compressor has a brushless motor with windings and a controller for braking the motor. The controller is configured to brake the brushless motor by using a braking current in a controlled manner starting from an operating rotational speed, in which the braking current during the controlled braking is dependent on induced voltages determined before the controlled braking. The method for braking includes rotating the motor at an operating rotational speed, receiving a signal for decelerating, braking or slowing down, determining voltages induced in the windings and supplying a braking current having a decreasing frequency to the windings, in which the braking current during the braking is dependent on the previously determined induced voltages. A compressor and a refrigeration appliance having the compressor are also provided.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: January 8, 2019
    Assignee: BSH Hausgeraete GmbH
    Inventors: Tommy Beckmann, Achim Paulduro
  • Patent number: 10164562
    Abstract: A method of controlling an alternating current (AC) motor includes following steps: (a) providing a voltage to the AC motor, wherein the voltage is a pulse-width modulation (PWM) signal, which is represented by a voltage reference vector; (b) determining that the voltage reference vector is in a distortion region; and (c) in response to determining that the voltage reference vector is in the distortion region, modifying, via a controller, the PWM signal by updating the voltage reference vector every half switching period to avoid the distortion region.
    Type: Grant
    Filed: April 12, 2017
    Date of Patent: December 25, 2018
    Assignee: GM Global Technology Operations LLC
    Inventors: Anno Yoo, Sung-Yoon Jung
  • Patent number: 10153714
    Abstract: An embodiment of a control system for controlling operation of an electric motor includes a current command module configured to receive a torque command and output a current command, and a current controller module configured to generate a modulation index value based on the current command. The system also includes a signal generator configured to generate a voltage signal modulated via a pulse width modulation (PWM) scheme based on the modulation index value, the PWM scheme being a combination of a continuous PWM scheme and a non-continuous PWM scheme based on the modulation index value being greater than or equal to a first threshold value, the signal generator configured to output the voltage signal to the electric motor.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: December 11, 2018
    Assignee: STEERING SOLUTIONS IP HOLDING CORPORATION
    Inventors: Zhe Zhang, Prerit Pramod
  • Patent number: 10153686
    Abstract: A method of commutation in a matrix rectifier from an active vector to a zero vector includes two steps. A method of commutation in a matrix rectifier from a zero vector to an active vector includes three steps.
    Type: Grant
    Filed: May 10, 2018
    Date of Patent: December 11, 2018
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Tao Zhao, Dewei Xu, Jahangir Afsharian, Bing Gong, Zhihua Yang