Patents by Inventor Shingo NISHIGUCHI
Shingo NISHIGUCHI has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11239784Abstract: Stable current control is performed even at the time of occurrence of disturbance, while the steadily occurring current pulsation is suppressed. A motor drive device 100 includes a power conversion circuit 103 that drives an alternating-current motor 101, and a controller 102 that controls the power conversion circuit 103. The controller 102 includes a voltage command calculation unit 108, a control state judgement unit 112, and a control gain change unit 113.Type: GrantFiled: March 14, 2019Date of Patent: February 1, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Noriya Nakao, Kazuaki Tobari, Fumikazu Takahashi, Shingo Nishiguchi
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Publication number: 20210257946Abstract: Stable current control is performed even at the time of occurrence of disturbance, while the steadily occurring current pulsation is suppressed. A motor drive device 100 includes a power conversion circuit 103 that drives an alternating-current motor 101, and a controller 102 that controls the power conversion circuit 103. The controller 102 includes a voltage command calculation unit 108, a control state judgement unit 112, and a control gain change unit 113.Type: ApplicationFiled: March 14, 2019Publication date: August 19, 2021Applicant: HitachiI Automotive Systems, Ltd.Inventors: Noriya NAKAO, Kazuaki TOBARI, Fumikazu TAKAHASHI, Shingo NISHIGUCHI
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Patent number: 10447183Abstract: A motor is driven while suppressing drive torque ripple generated by the motor, when any of the phases is opened during the driving of the motor. A motor drive device controls the driving of a motor in which the armature windings of respective phases are independently provided. The motor drive device is equipped with: an inverter circuit for converting the DC power supplied through DC bus lines to three-phase AC powers and respectively outputting the three-phase AC powers to the armature windings of the respective phases; and a controller for controlling the inverter circuit. When any of the phases is opened in the AC powers output from the inverter circuit, the controller adjusts the difference between the phases of the respective currents flowing through the armature windings of normal phases so that the AC powers of the other normal phases except the opened phase are compensated each other.Type: GrantFiled: June 24, 2015Date of Patent: October 15, 2019Assignee: Hitachi Automotive Systems, Ltd.Inventors: Katsuhiro Hoshino, Shingo Nishiguchi, Toshisada Mitsui, Kazuto Oyama, Hideki Miyazaki
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Publication number: 20170133958Abstract: The purpose of the present invention is to continue to drive a motor while suppressing drive torque ripple generated by the motor, when any of the phases is opened during the driving of the motor. A motor drive device controls the driving of a motor in which the armature windings of respective phases are independently provided. The motor drive device is equipped with: an inverter circuit for converting the DC power supplied through DC bus lines to three-phase AC powers and respectively outputting the three-phase AC powers to the armature windings of the respective phases; and a controller for controlling the inverter circuit. When any of the phases is opened in the AC powers output from the inverter circuit, the controller adjusts the difference between the phases of the respective currents flowing through the armature windings of normal phases so that the AC powers of the other normal phases except the opened phase are compensated each other.Type: ApplicationFiled: June 24, 2015Publication date: May 11, 2017Inventors: Katsuhiro HOSHINO, Shingo NISHIGUCHI, Toshisada MITSUI, Kazuto OYAMA, Hideki MIYAZAKI
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Publication number: 20140049198Abstract: A power conversion device includes a power switching circuit that supplies AC voltages generated between switching elements operating as upper arms and switching elements operating as lower arms, and a control circuit that generates and supplies to the driver circuit signals for controlling the switching operation of the switching elements by a PWM method in a first operational region in which frequency of an AC power to be outputted is low, and that generates and supplies to the driver circuit signals for controlling the switching operation of the switching elements at timings based upon the phase of the AC power to be outputted in an operational region in which the frequency of the AC power to be outputted is higher than in the first operational region.Type: ApplicationFiled: August 9, 2013Publication date: February 20, 2014Applicant: Hitachi, Ltd.Inventors: Kazuto OOYAMA, Toshisada MITSUI, Shingo NISHIGUCHI, Kimihisa FURUKAWA
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Patent number: 8471518Abstract: A power conversion device includes a power switching circuit that has a plurality of series circuits in each of which a switching element that operates as an upper arm and a switching element that operates as a lower arm are connected in series, and a control circuit that generates control signals for controlling the continuity or discontinuity of the switching elements, and, if the relationship between the state of a switching element in a control cycle and the state of the switching element in the next control cycle is a discontinuous relationship, that additionally performs control to make the switching element continuous or discontinuous on the basis of the state of the switching element in the control cycle and the state of the switching element in the next control cycle.Type: GrantFiled: February 16, 2011Date of Patent: June 25, 2013Assignee: Hitachi, Ltd.Inventors: Shingo Nishiguchi, Kimihisa Furukawa, Akinori Kamiya, Toshisada Mitsui, Kazuto Ooyama
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Publication number: 20130066501Abstract: It is desirable to enhance efficiency of a power conversion device in both of a case where a motor generator which is an electric rotating machine is operated as a motor and a case where the motor generator is operated as a generator by performing regeneration braking. At the time of performing regeneration braking, strength of regeneration braking can be controlled by making an inverter circuit conductive in response to a predetermined phase of an AC output which the inverter circuit generates and by controlling a conduction width. Due to such a control, the number of times of switching a semiconductor element which constitutes the inverter circuit can be reduced thus suppressing heat generation of the semiconductor element and also the efficiency of the power conversion device can be enhanced. Further, the enhancement of efficiency of the power conversion device can be realized also in a motor operation and hence, it is also possible to enhance efficiency with respect to the traveling of a vehicle.Type: ApplicationFiled: April 28, 2010Publication date: March 14, 2013Applicant: Hitachi, Ltd.Inventors: Kazuto Oyama, Hideki Miyazaki, Kimihisa Furukawa, Toshisada Mitsui, Shingo Nishiguchi, Akinori Kamiya
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Publication number: 20130033205Abstract: A control circuit of a power conversion device calculates voltage command signals for determining timings for making switching elements of a power switching circuit continuous by performing feed forward control on the basis of input information, and feedback control on the basis of the input information and current values of AC output, for each of the d axis and the q axis of a motor.Type: ApplicationFiled: April 28, 2010Publication date: February 7, 2013Applicant: HITACHI, LTD.Inventors: Kimihisa Furukawa, Toshisada Mitsui, Shingo Nishiguchi, Kazuto Ooyama, Hideki Miyazaki, Akinori Kamiya
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Publication number: 20110266992Abstract: A power conversion device includes a power switching circuit that has a plurality of series circuits in each of which a switching element that operates as an upper arm and a switching element that operates as a lower arm are connected in series, and a control circuit that generates control signals for controlling the continuity or discontinuity of the switching elements, and, if the relationship between the state of a switching element in a control cycle and the state of the switching element in the next control cycle is a discontinuous relationship, that additionally performs control to make the switching element continuous or discontinuous on the basis of the state of the switching element in the control cycle and the state of the switching element in the next control cycle.Type: ApplicationFiled: February 16, 2011Publication date: November 3, 2011Applicant: Hitachi, Ltd.Inventors: Shingo NISHIGUCHI, Kimihisa Furukawa, Akinori Kamiya, Toshisada Mitsui, Kazuto Ooyama
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Publication number: 20110193509Abstract: A power conversion device includes a power switching circuit that supplies AC voltages generated between switching elements operating as upper arms and switching elements operating as lower arms, and a control circuit that generates and supplies to the driver circuit signals for controlling the switching operation of the switching elements by a PWM method in a first operational region in which frequency of an AC power to be outputted is low, and that generates and supplies to the driver circuit signals for controlling the switching operation of the switching elements at timings based upon the phase of the AC power to be outputted in an operational region in which the frequency of the AC power to be outputted is higher than in the first operational region.Type: ApplicationFiled: February 9, 2011Publication date: August 11, 2011Applicant: Hitachi, Ltd.Inventors: Kazuto OOYAMA, Toshisada Mitsui, Shingo Nishiguchi, Kimihisa Furukawa