Pluse Width Modulation Or Chopping Patents (Class 318/811)
  • 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
  • Patent number: 10135375
    Abstract: A rotation controller for an AC electric motor includes a space vector generator, a current change ratio obtainer, and a rotational angle calculator. The space vector generator generates at least a first magnetic field in a first direction and a second magnetic field in a second direction crossing the first direction in a rotation plane of a saliency-exhibiting rotor. The space vector generator synthesizes the first magnetic field and the second magnetic field into a synthesized magnetic field. The current change ratio obtainer acquires a first current change ratio of a first current generated in the first direction in a stator and a second current change ratio of a second current generated in the second direction in the stator. The rotational angle calculator calculates a rotational angle of the saliency-exhibiting rotor based on at least the first and second current change ratios and the first and second directions.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: November 20, 2018
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Shingo Fukumaru, Keita Shimamoto, Shinya Morimoto
  • Patent number: 10135237
    Abstract: A system is provided. The system includes a plurality of uninterruptible power supplies (UPSs), each UPS of the plurality of UPSs including an inverter, a ring bus, and at least one controller communicatively coupled to the plurality of UPSs, the at least one controller configured to control at least one bridge current in each UPS, the at least one bridge current controlled such that the inverter of each UPS operates in a partial current limiting regime between a full current limiting regime and a linear mode.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: November 20, 2018
    Assignee: ABB Schweiz AG
    Inventors: Silvio Colombi, Andrea Mannuccini, Luigi De Bernardi
  • Patent number: 10116302
    Abstract: A high-side switching element is provided between a main output terminal having an intermediate potential and a high-side terminal. A signal transmission circuit includes a first point, a second point, a signal switching element, and a diode. The intermediate potential is applied to the first point. A referred potential between the low-side potential and the high-side potential is applied to the second point. The signal switching element has a first end connected to the first point and a second end, and is switched in accordance with a conversion signal. The diode is provided between the second point and the second end of the signal switching element and has a direction with which a forward current can flow by a voltage between the first point and the second point in a case where the intermediate potential is the low-side potential.
    Type: Grant
    Filed: January 16, 2018
    Date of Patent: October 30, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Haruhiko Murakami, Rei Yoneyama, Masayuki Ando, Hiroyuki Okabe
  • Patent number: 10075119
    Abstract: A system and method for controlling a DC midpoint terminal voltage of a three level inverter is provided. The method includes receiving an input power signal at a three level motor controller system that includes a three level inverter, measuring, using a current sensor in the three level motor controller system, a DC current of the input power signal before the input power signal is provided to the three level inverter, and adjusting a zero-sequence inverter output voltage to adjust a midpoint voltage at the DC midpoint based on the measured DC current.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: September 11, 2018
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Dwight D. Schmitt, Curtis J. Plude, Adam Michael White, John Duward Sagona
  • Patent number: 10056857
    Abstract: A motor control system and associated method includes a transform component configured to receive current values associated with a motor being driven by the motor control system, and output rotating coordinate system values representing a flux generating component and a torque generating component of a current space vector. The motor control system and method further includes a control component configured to receive the flux generating component and the torque generating component of the current space vector, and generate motor control signals for driving the motor by performing a Cartesian to polar transform to obtain values associated with a rotating coordinate system followed by an angle addition to convert the rotating coordinate system values to values of a stationary coordinate system.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: August 21, 2018
    Assignee: Infineon Technologies AG
    Inventors: Tao Zhao, Arno Rabenstein, Theng Kiong Gan, Choon Keat Kok, Sze Main Wong
  • Patent number: 10032556
    Abstract: A system for compensating one or more DC components in an electrical system includes one or more sensors for sensing the one or more DC components. The system also includes one or more DC component controllers for generating one or more reference signals from one or more signals received from the one or more sensors. In addition to this, the system also has one or more controllers for generating one or more firing pulses from the one or more reference signals received from the one or more DC component controllers and one or more valve configurations for charging one or more controllable branches to counterbalance the one or more DC components of the electrical system. A method for compensating one or more DC components in an electrical system is also provided.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: July 24, 2018
    Assignee: Siemens Aktiengesellschaft
    Inventors: Florian Bachinger, Patrik Ernst, Peter Hamberger, Clemens Keplinger, Juergen Lottes, Georg Pilz, Markus Wiesinger
  • Patent number: 10027271
    Abstract: A rotating electrical machine control device with an electronic control unit that is programmed to: switch a modulation method between asynchronous modulation in which switching of the inverter is controlled by modulated pulses generated based on a carrier having a first carrier frequency which is not synchronous with rotation of the rotating electrical machine and synchronous modulation in which switching of the inverter is controlled by modulated pulses generated in synchronization with rotation of the rotating electrical machine, the switching of the modulation method between the asynchronous modulation and the synchronous modulation being performed according to an operating condition of the rotating electrical machine which includes at least a rotational speed of the rotating electrical machine.
    Type: Grant
    Filed: June 2, 2016
    Date of Patent: July 17, 2018
    Assignee: AISIN AW CO., LTD.
    Inventors: Subrata Saha, Yasuyuki Sato, Chaeduck Chon, Yuki Sugiyama
  • Patent number: 10020688
    Abstract: A power supply ECU executes turn-on current control for controlling a turn-on current It to a target value Itr by adjusting a drive frequency f, turn-on current It indicating an output current Io of an inverter at a rising of an output voltage Vo of the inverter. Target value Itr is set to fall within a range where a recovery current is not produced in the inverter. In the turn-on current control, when a startup frequency indicating drive frequency f at a startup of the inverter is fa0, the control unit adjusts drive frequency f to be more than or equal to fa0. When turn-on current It is larger than target value Itr, the control unit adjusts drive frequency f in the direction toward startup frequency fa0.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: July 10, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Takahiro Misawa
  • Patent number: 10020655
    Abstract: The global synchronous pulse width modulation system includes main control unit and plurality of grid-connected inverters located at different geographical locations, wherein each grid-connected inverter is connected with a distributed power supply; each grid-connected inverter is connected with a grid through a point of common coupling; main control unit communicates with all grid-connected inverters through communication channels; main control unit receives information of grid-connected inverters and respectively sends a global synchronous signal containing global synchronous strategy to grid-connected inverters after determining global synchronous strategy; grid-connected inverters regulate the phases of their own pulse width modulation waves through global synchronous signal to enable pulse width modulation waves of grid-connected inverters to satisfy a phase difference of harmonic counteraction, so as to counteract harmonic current injected by grid-connected inverters into grid.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: July 10, 2018
    Assignee: SHANDONG UNIVERSITY
    Inventors: Feng Gao, Tao Xu
  • Patent number: 10008920
    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: March 25, 2016
    Date of Patent: June 26, 2018
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Tao Zhao, Dewei Xu, Jahangir Afsharian, Bing Gong, Zhihua Yang
  • Patent number: 10008957
    Abstract: Provided is a new control method that causes no time lag or hunting when a power conversion direction is reversed. The power conversion apparatus includes switching elements (S1 and S2) that alternately perform switching and are capable of reversing the power conversion direction without suspension, and an up/down counter register (RT) that has two different thresholds and selects counting up at a smaller threshold, counting down at a larger threshold, and holding of the value between the two thresholds. According to the value of the up/down counter register (RT), a gate pulse is generated to control the switching of the switching elements (S1 and S2).
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: June 26, 2018
    Assignees: WINZ CORPORATION, GODO SANGYO CO.
    Inventors: Shoji Horiuchi, Nozomi Tan
  • Patent number: 9964111
    Abstract: A motor-driven compressor includes an electric motor driven by a motor driver, which includes a switching element that converts DC voltage from a battery to AC voltage. A control unit controls the switching operation of the switching element. A temperature detector detects the temperature of the switching element. The control unit suspends the switching operation of the switching element when the temperature detected by the temperature detector rises to a temperature threshold. The temperature threshold includes a first temperature threshold, corresponding to a withstand temperature of the switching element, and a second temperature threshold, which is higher than the first temperature threshold. The control unit switches the temperature threshold from the first temperature threshold to the second temperature threshold when the control unit activates a field weakening control that reduces counter electromotive force generated by the electric motor.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: May 8, 2018
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Junya Yano, Tsuyoshi Yamaguchi, Tatsuya Koide, Ken Suitou, Yoshiki Nagata
  • Patent number: 9966959
    Abstract: A feedback control system may include a feedback controller for controlling a plant using pulse density signals. The feedback controller may include a pulse density signal generator and a controller logic circuit. The pulse density signal generator may receive input command signals and generate signed or unsigned pulse density input signals. The controller logic may receive the pulse density input signals from the pulse density signal generator and feedback pulse density signals from the plant and may generate corresponding pulse density control signals for controlling the plant based on the input command signals. The controller logic may include a sign change logic, an addition circuit, and an optional amplifier circuit. The pulse density signal generator may also include rate transition circuits for ensuring that the pulse density input signals and the feedback pulse density signals are uncorrelated.
    Type: Grant
    Filed: July 19, 2016
    Date of Patent: May 8, 2018
    Assignee: Altera Corporation
    Inventor: Benjamin Peter Jeppesen
  • Patent number: 9960674
    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: February 26, 2016
    Date of Patent: May 1, 2018
    Assignee: ON-BRIGHT ELECTRONICS (SHANGHAI) CO., LTD.
    Inventors: Qian Fang, Cong Lan, Lieyi Fang
  • Patent number: 9938976
    Abstract: A motor-driven compressor includes an electric motor driven by a motor driver, which includes a switching element that converts DC voltage from a battery to AC voltage. A control unit controls the switching operation of the switching element. A temperature detector detects the temperature of the switching element. A voltage detector detects DC voltage applied to the switching element from the battery. The control unit suspends the switching operation of the switching element when the temperature detected by the temperature detector rises to a predetermined temperature threshold. The control unit also reduces counter electromotive force generated by the electric motor. The temperature threshold includes a first temperature threshold, corresponding to a withstand temperature of the switching element, and a second temperature threshold, which is higher than the first temperature threshold. The control unit switches the temperature threshold between the first and second temperature thresholds.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: April 10, 2018
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Junya Yano, Tsuyoshi Yamaguchi, Tatsuya Koide, Ken Suitou, Yoshiki Nagata
  • Patent number: 9906168
    Abstract: A power converting apparatus is provided. The power converting apparatus includes a power converter configured to output a voltage to a load, and a controller configured to output a PWM signal which is generated in response to a voltage command to the power converter. The power converter includes a plurality of switching elements driven based on the PWM signal. The controller is configured to generate the PWM signal such that a first period during which a zero voltage is outputted and a second period during which a non-zero voltage is outputted are adjusted according to the voltage command. The controller is allowed to output the PWM signal which is set such that one first period and one or more second periods exist within an updating cycle of the voltage command, to the power converter.
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: February 27, 2018
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Taisuke Katayama, Hiroshi Takagi
  • Patent number: 9899903
    Abstract: A switching pattern determination unit in a control unit includes a modulation rate ensuring unit, a harmonic reducing unit, and a function combining unit, and sets a function f prescribing the relationship between each switching phase and a modulation rate, a function Y prescribing the relationship between each switching phase and the sum of squares of values obtained by multiplying a harmonic component of each order by a weighting coefficient of each order, and an evaluation function X formed from the function Y, the function f, and a weighting variable. Then, by a switching phase calculation unit and a switching pattern storage unit, each switching pattern according to each modulation rate m and each number of pulses is obtained and stored which ensures the modulation rate and reduces an addition value of harmonic components of respective orders.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: February 20, 2018
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Keiko Tada, Hiromitsu Suzuki
  • Patent number: 9862409
    Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that has a 3-shunt control function to perform a 3-shunt PWM-control for raising a reliability of the apparatus and for improving a stability, and a 1-shunt control function to perform a 1-shunt PWM-control so as to continue an assist control when the 3-shunt control function is damaged. [Means for solving the problem] The electric power steering apparatus according to the present invention, having: a 3-shunt control function to perform a 3-shunt PWM-control with a first 3-phase detected current values based on down-stream 3-shunt; a 1-shunt control function to perform a 1-shunt PWM-control with a second 3-phase detected current values based on down-stream 1-shunt; and a switching function to switch from the 3-shunt control function to the 1-shunt function when a failure of current detection circuit system in relation to the first 3-phase detected current values is detected.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: January 9, 2018
    Assignee: NSK LTD.
    Inventors: Kyosho Uryu, Shin Kumagai
  • Patent number: 9790944
    Abstract: A motor-driven compressor includes an electric motor driven by a motor driver, which includes a switching element that converts DC voltage from a battery to AC voltage. A temperature detector detects the temperature of the switching element. A voltage detector detects DC voltage applied to the switching element from the battery. A control unit suspends the switching operation of the switching element when the detected temperature rises to a temperature threshold. The control unit reduces counter electromotive force generated by the electric motor. The controller changes the temperature threshold such that the temperature threshold gradually increases from when the detected DC voltage is the highest voltage in the applicable voltage range of the battery to when the detected DC voltage is the lowest voltage in the applicable voltage range.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: October 17, 2017
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Junya Yano, Tsuyoshi Yamaguchi, Tatsuya Koide, Ken Suitou, Yoshiki Nagata
  • Patent number: 9732991
    Abstract: A motor driving device includes a rectifier to rectify inputted alternating current (AC) power, a boost converter to boost and to output the power rectified by the rectifier, and an inverter including a plurality of switching devices to output converted AC power to a motor using a voltage from the boost converter. Accordingly, a voltage utilization ratio of a voltage input to an inverter in the motor driving device using a low-capacitance capacitor is enhanced.
    Type: Grant
    Filed: December 24, 2014
    Date of Patent: August 15, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Joonsik An, Sangyoung Kim, Taeyoung Park, Kyungmin Kim
  • Patent number: 9722511
    Abstract: Systems and methods for controlling an electrical power supply are provided. One system includes an input configured for receiving voltage measurement signals for the power supply and a controller for one or more electrical phases of the power supply. The controller includes an integrator configured to integrate the received voltage measurement signals and to generate integrated control signals or integrated error signals. The controller is configured to generate an output signal using the integrated control signals or the integrated error signals. The system also includes an output configured to output the output signal to control switching of the power supply.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: August 1, 2017
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Luis Jose Garces, Juan Antonio Sabate, Di Zhang
  • Patent number: 9712051
    Abstract: An apparatus for electric power conversion includes a converter having a regulating circuit and switching network. The regulating circuit has magnetic storage elements, and switches connected to the magnetic storage elements and controllable to switch between switching configurations. The regulating circuit maintains an average DC current through a magnetic storage element. The switching network includes charge storage elements connected to switches that are controllable to switch between plural switch configurations. In one configuration, the switches forms an arrangement of charge storage elements in which at least one charge storage element is charged using the magnetic storage element through the network input or output port. In another, the switches form an arrangement of charge storage elements in which an element discharges using the magnetic storage element through one of the input port and output port of the switching network.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: July 18, 2017
    Assignee: Arctic Sand Technologies, Inc.
    Inventor: David M. Giuliano
  • Patent number: 9712072
    Abstract: A power converter converts input power into DC power. A first switching element is connected between an output node and a high voltage node of the power converter. A second switching element is connected between the output node and a low voltage node of the power converter. First to third driver circuits have first to third power supply nodes to be supplied with first to third operating voltages based on first to third voltages at the output node, the low voltage node, and the high voltage node, respectively. The first to third driver circuits drive the first to third switching elements based on the first to third voltages, respectively. A rectifier circuit is connected between the power supply nodes of the first and second driver circuits, and supplies a current from the power supply node of the first driver circuit toward the power supply node of the third driver circuit.
    Type: Grant
    Filed: November 29, 2013
    Date of Patent: July 18, 2017
    Assignee: SHINDENGEN ELECTRIC MANUFACTURING CO., LTD.
    Inventors: Hiroyuki Kawai, Ken-ichi Iwao
  • Patent number: 9703337
    Abstract: A method for controlling the temperature of a component is disclosed. The component is part of a drive configured to drive an electrical machine via an electrically conductive member. The method comprises determining a value of an attribute of the electrically conductive member; configuring a model to calculate the temperature of the component, the model being configured based on the determined value of the attribute of the electrically conductive member; using the model to calculate the temperature of the component; and if the calculated temperature of the component does not meet a predetermined temperature condition, issuing a command to control the operation of the drive such that the temperature of the component is changed to meet the predetermined temperature condition.
    Type: Grant
    Filed: May 3, 2013
    Date of Patent: July 11, 2017
    Assignee: NIDEC CONTROL TECHNIQUES LIMITED
    Inventors: Gareth Christopher James, Robert Gwyn Williams, Nathan Downes
  • Patent number: 9688303
    Abstract: A system and method for detecting failure of a steering angle sensor include: a steering angle sensor, an angular position encoder and an electronic control unit. The electronic control unit reads an initial value of the steering wheel rotation angle signal and estimates a rotation angle of a steering wheel based on the motor rotation angle signal, the electronic control unit checks if a difference between an actual value of the steering wheel rotation angle signal and an estimated rotation angle of the steering wheel is smaller than a predetermined value or not, if the difference is bigger than the predetermined value, it means that the steering wheel rotation angle signal fails, and the estimated rotation angle of the steering wheel serves as a substitute signal and is sent to the electronic control unit.
    Type: Grant
    Filed: February 10, 2016
    Date of Patent: June 27, 2017
    Assignee: Hiwin Technologies Corp.
    Inventor: Chih-Wei Yang
  • Patent number: 9660545
    Abstract: A matrix converter includes: a power convertor that includes a plurality of bidirectional switches configured to control a conducting direction using a plurality of switching elements; a command generator configured to generate a control command for a PWM control on the plurality of switching elements; and a commutation controller configured to perform a commutation control on the plurality of bidirectional switches in a case where the control command changes. In a case where the control command changes during execution of the commutation control, the commutation controller executes a handover step for handover to a next commutation control and then executes the next commutation control from a step in a course of the next commutation control.
    Type: Grant
    Filed: October 14, 2014
    Date of Patent: May 23, 2017
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Hirofumi Kinomura, Joji Ebisu, Koji Iwahashi
  • Patent number: 9648618
    Abstract: A bandpass filter includes a plurality of parallel paths. Each path includes a first mixer, a low-pass filter, and a second mixer. The first mixer in each path receives the input signal and mixes the input signal with a periodic mixer sequence. The low-pass filter in each path is operable to filter an output of the associated first mixer. The second mixer in each path is coupled to receive an output of the associated low-pass filter and mixes said filter output with a periodic mixer sequence having a period that is divided into a plurality of time slots, wherein again the mixer value is constant during each time slot. A summer sums the outputs of the second mixers of each of the paths to generate an output of the bandpass filter.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: May 9, 2017
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Guolong Su, Arthur John Redfern
  • Patent number: 9641120
    Abstract: A motor control apparatus includes a voltage regulator to execute a voltage increase mode to increase a voltage applied to an induction motor from a lower limit of a first range over time. A frequency regulator executes a frequency decrease mode to decrease a frequency of the voltage from an upper limit of a second range over time. When a current through the motor exceeds a first threshold in the voltage increase mode, a mode changer changes the mode to the frequency decrease mode. When the current through the motor becomes smaller than a second threshold in the frequency decrease mode, the mode changer changes the mode to the voltage increase mode to control the motor to change from a free running state to a state in which the voltage and the frequency satisfy a relationship. A determinator determines whether the voltage and the frequency satisfy the relationship.
    Type: Grant
    Filed: October 22, 2014
    Date of Patent: May 2, 2017
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Shuji Matsuda, Hideaki Iura
  • Patent number: 9628004
    Abstract: A motor drive device includes: an inverter circuit that has three switching elements corresponding to three phases of a three-phase motor coil, converts a DC applied voltage of a power source to an AC voltage by a PWM, and output the AC voltage to the motor coil; a voltage detection device for the DC applied voltage; and a control device that controls the PWM. The control device selects a first modulation method, for fixing the on/off-state of a part of the switching elements and for switching the on/off-state of the other part of the switching elements, or a second modulation method, for switching the on/off-state of the switching elements corresponding to three phases. The control device switches from the first modulation method to the second modulation method when the DC applied voltage is equal to or greater than a predetermined voltage, and the first modulation method is selected.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: April 18, 2017
    Assignee: DENSO CORPORATION
    Inventor: Koji Sakai
  • Patent number: 9602041
    Abstract: The method of controlling a rotating three-phase motor involves generating in synchronism with the rotation of the motor a variable duty cycle pulse-width modulated signal for each of the switching circuit components used to supply current to the motor coils. The generated variable duty cycle pulse-width modulated signals control the switching circuit components to selectively place pairs of motor coils in current conducting states and to develop an associated varying voltage for each of the phases. This varying voltage is monitored to identify the one phase that is at a voltage in between the voltages of the other two phases. Then for the identified one phase, the variable duty cycle pulse-width modulated signal is specially generated so that when the switching circuit components of the other two phases are concurrently switched on, the switching circuit component of the identified one phase is not switched on.
    Type: Grant
    Filed: January 8, 2016
    Date of Patent: March 21, 2017
    Assignee: Newfrey LLC
    Inventors: Zuher Naim Khalaf, Jeffrey Scott Aranowski
  • Patent number: 9595864
    Abstract: A method is provided for balancing voltages of a DC link of a multi-level inverter, where the DC link is divided into two halves by a neutral point connection. The method includes injecting a periodic common-mode voltage injection signal to a common-mode voltage reference and a periodic power injection signal to a power reference of the inverter. The power injection signal has the same frequency as the common-mode voltage injection signal. A phase shift between the common-mode voltage injection signal and the power injection signal is constant. The amplitude of at least one of the common-mode voltage injection signal and the power injection signal is controlled on the basis of a difference between voltages over the two halves of the DC link. An apparatus is also provided for implementing the method.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: March 14, 2017
    Assignee: ABB Technology Oy
    Inventor: Samuli Heikkilä
  • Patent number: 9595907
    Abstract: A current measurement module is adapted to measure an observed current level for the inverter. A data processor or mode controller accesses a stored representation of first current level versus rotor speed output at which a total harmonic distortion level is less than threshold total harmonic distortion level. The data processor or mode controller enables the inverter to use SVPWM (space vector pulse width modulation) if the observed current level is less than the first current level for the measured or determined rotor speed. Further, the data processor or mode controller enables the inverter to use DPWM (discontinuous pulse width modulation) if the observed current level is greater than or equal to the first current level for the measured or determined rotor speed.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: March 14, 2017
    Assignee: DEERE & COMPANY
    Inventors: Christopher L Marohl, David Holmburg, Anthony Weber, Long Wu, Jared Lervik
  • Patent number: 9584043
    Abstract: Methods and apparatus are presented for sampling low side inverter phase currents, in which current sampling is selectively delayed in a given PWM cycle by a non-zero sampling delay time value from a nominal sample time if the middle pulse width value is less than a non-zero first threshold to facilitate adequate signal settling for accurate current measurement, and if a middle total continuous on-time near the end of the given PWM cycle is less than a non-zero second threshold, the middle total continuous on-time is selectively extended by adding a non-zero adjustment offset time value to a middle pulse width value for a next PWM cycle.
    Type: Grant
    Filed: February 28, 2015
    Date of Patent: February 28, 2017
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Zhendong Zhang, Takayoshi Matsuo, David Leggate, Timothy M. Rowan, Russel J. Kerkman, Bing Li
  • Patent number: 9577559
    Abstract: An apparatus for controlling power generation of a vehicle includes an alternator for generating electricity using an engine torque. A controller is configured to calculate a difference between a first duty value and a second duty value and to transmit a control signal based on the difference. The first duty value is an output duty value of the alternator before reaching a predetermined time, and the second duty value is a current output duty value of the alternator. A regulator gradually increases the amount of power generated by the alternator during a delay time based on the control signal received from the controller.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: February 21, 2017
    Assignees: HYUNDAI MOTOR COMPANY, KIA MOTORS CORP.
    Inventor: Hyun Kim