Patents by Inventor Yoshihiro Takeshima

Yoshihiro Takeshima 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).

  • Patent number: 12132429
    Abstract: A power conversion device and a motor system according to the present disclosure comprises an inverter circuit which is connected to a motor, a switch circuit, and a control circuit. The power conversion device and the motor system are characterized in that the inverter circuit and the switch circuit are capable of two-level operation and three-level operation, and the control circuit switches between the two-level operation and the three-level operation on the basis of the motor torque command and the rotational speed command. As a result, it is possible to reduce the total loss in the power conversion device and the motor.
    Type: Grant
    Filed: January 15, 2020
    Date of Patent: October 29, 2024
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Satoshi Murakami, Yoshihiro Takeshima, Yoshiaki Ishiguro, Akira Nakagawa, Ryota Kondo
  • Patent number: 11682996
    Abstract: An inverter is provided for driving a motor. A first capacitor, and a second capacitor including capacitors connected in series, are connected in parallel to a DC power supply. A switch circuit having switching elements is connected between the inverter and the second capacitor. A control circuit is provided for controlling the inverter and the switch circuit. The control circuit performs control to switch the switch circuit so as to supply current from the second capacitor to the inverter during 3-level operation, and supply current from both of the first capacitor and the second capacitor to the inverter during 2-level operation.
    Type: Grant
    Filed: January 21, 2020
    Date of Patent: June 20, 2023
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Satoshi Murakami, Yoshihiro Takeshima, Yoshiaki Ishiguro, Akira Nakagawa, Ryota Kondo
  • Publication number: 20230130570
    Abstract: Provided is a power conversion device with which a region in which an electronic component is mountable in a first printed wiring board of a first substrate can be enlarged. The power conversion device includes a power module installing member, a power module, a bus bar assembly, a first substrate provided on the bus bar assembly, and a second substrate provided on the bus bar assembly. The first substrate includes a first printed wiring board, and a signal terminal connector and a first board-to-board connection connector which are each provided on the first printed wiring board. The second substrate includes a second printed wiring board and a second board-to-board connection connector provided on the second printed wiring board. The signal terminal connector is connected to a signal terminal of the power module. The first board-to-board connection connector and the second board-to-board connection connector are connected to each other.
    Type: Application
    Filed: October 19, 2022
    Publication date: April 27, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Naoya ABE, Kenta FUJII, Yoshihiro TAKESHIMA, Satoshi ISHIBASHI, Yujiro NAKADA, Yukiko NAKANISHI
  • Publication number: 20230019205
    Abstract: A power conversion device and a motor system according to the present disclosure comprises an inverter circuit which is connected to a motor, a switch circuit, and a control circuit. The power conversion device and the motor system are characterized in that the inverter circuit and the switch circuit are capable of two-level operation and three-level operation, and the control circuit switches between the two-level operation and the three-level operation on the basis of the motor torque command and the rotational speed command. As a result, it is possible to reduce the total loss in the power conversion device and the motor.
    Type: Application
    Filed: January 15, 2020
    Publication date: January 19, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Satoshi MURAKAMI, Yoshihiro TAKESHIMA, Yoshiaki ISHIGURO, Akira NAKAGAWA, Ryota KONDO
  • Publication number: 20220407446
    Abstract: An inverter is provided for driving a motor. A first capacitor, and a second capacitor including capacitors connected in series, are connected in parallel to a DC power supply. A switch circuit having switching elements is connected between the inverter and the second capacitor. A control circuit is provided for controlling the inverter and the switch circuit. The control circuit performs control to switch the switch circuit so as to supply current from the second capacitor to the inverter during 3-level operation, and supply current from both of the first capacitor and the second capacitor to the inverter during 2-level operation.
    Type: Application
    Filed: January 21, 2020
    Publication date: December 22, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Satoshi MURAKAMI, Yoshihiro TAKESHIMA, Yoshiaki ISHIGURO, Akira NAKAGAWA, Ryota KONDO
  • Patent number: 11342847
    Abstract: A magnetically coupled reactor and a DC/DC converter are provided between a DC power supply and an inverter. A first smoothing capacitor is provided between the DC power supply and the coupled reactor. A second smoothing capacitor is provided between the DC/DC converter and the inverter. A controller is provided in order to control switching operations of the inverter and the DC/DC converter. The controller causes semiconductor switching elements composing upper and lower arms of the DC/DC converter to perform complementary operations so as to be alternately turned on/off, and causes left and right legs to operate with their switching phases shifted from each other, thereby electric charges stored in both smoothing capacitors are discharged by energy loss in the coupled reactor and the DC/DC converter.
    Type: Grant
    Filed: February 25, 2019
    Date of Patent: May 24, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Satoshi Murakami, Hiroyasu Iwabuki, Yoshihiro Takeshima
  • Patent number: 11183929
    Abstract: A power conversion device including: a power conversion unit which is connected to two DC power supplies and performs power conversion; and a control unit which calculates a manipulated variable for controlling output voltage of the power conversion unit, wherein the manipulated variable for control is calculated on the basis of a voltage detection value on the primary side or the secondary side of the power conversion unit and a predetermined fixed value.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: November 23, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Akinu Nakabayashi, Mai Nakada, Yoshihiro Takeshima
  • Publication number: 20210119537
    Abstract: A power conversion device including: a power conversion unit which is connected to two DC power supplies and performs power conversion; and a control unit which calculates a manipulated variable for controlling output voltage of the power conversion unit, wherein the manipulated variable for control is calculated on the basis of a voltage detection value on the primary side or the secondary side of the power conversion unit and a predetermined fixed value.
    Type: Application
    Filed: December 29, 2016
    Publication date: April 22, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Akinu NAKABAYASHI, Mai NAKADA, Yoshihiro TAKESHIMA
  • Publication number: 20210036619
    Abstract: A magnetically coupled reactor and a DC/DC converter are provided between a DC power supply and an inverter. A first smoothing capacitor is provided between the DC power supply and the coupled reactor. A second smoothing capacitor is provided between the DC/DC converter and the inverter. A controller is provided in order to control switching operations of the inverter and the DC/DC converter. The controller causes semiconductor switching elements composing upper and lower arms of the DC/DC converter to perform complementary operations so as to be alternately turned on/off, and causes left and right legs to operate with their switching phases shifted from each other, thereby electric charges stored in both smoothing capacitors are discharged by energy loss in the coupled reactor and the DC/DC converter.
    Type: Application
    Filed: February 25, 2019
    Publication date: February 4, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Satoshi MURAKAMI, Hiroyasu IWABUKI, Yoshihiro TAKESHIMA
  • Patent number: 10693392
    Abstract: A power conversion device includes a first switching unit connected between a DC power supply and an inverter circuit, a resonant circuit connected to the input of the inverter circuit and formed by connecting a capacitor, a reactor, and a second switching unit, and a control unit, wherein, during a resonant operation period in which the first switching unit is controlled to be off and the second switching unit is controlled to be on, the control unit controls the inverter circuit to shift from a mode in which current flows back through one of upper and lower arms of the inverter circuit to a mode in which current flows back through the other arm, and provides a period in which the upper and lower arms for every phase of the inverter circuit are turned on simultaneously.
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: June 23, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kohei Onda, Yoshihiro Takeshima, Tatsuya Kitamura, Hiroyasu Iwabuki, Hideyuki Sotome, Takaya Muto
  • Publication number: 20200112268
    Abstract: A power conversion device includes a first switching unit connected between a DC power supply and an inverter circuit, a resonant circuit connected to the input of the inverter circuit and formed by connecting a capacitor, a reactor, and a second switching unit, and a control unit, wherein, during a resonant operation period in which the first switching unit is controlled to be off and the second switching unit is controlled to be on, the control unit controls the inverter circuit to shift from a mode in which current flows back through one of upper and lower arms of the inverter circuit to a mode in which current flows back through the other arm, and provides a period in which the upper and lower arms for every phase of the inverter circuit are turned on simultaneously.
    Type: Application
    Filed: November 21, 2016
    Publication date: April 9, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kohei ONDA, Yoshihiro TAKESHIMA, Tatsuya KITAMURA, Hiroyasu IWABUKI, Hideyuki SOTOME, Takaya MUTO
  • Patent number: 10554120
    Abstract: [Technical Problem] In a power conversion device for stepping up or stepping down the input voltage, when voltage converter become out of order, it is not possible to specify an IGBT element and a current sensor, which is in an extraordinary fault condition. [Solution to Problem] The power conversion device is configured to detect a voltage value of a smoothing condenser, connected in parallel to a load, where the load is to be connected to the power conversion device; detects, by a first current sensor, a current which flows through switching elements in a plurality of voltage converter; decides an abnormality of a switching element, by switching the switching element one by one; specifies the abnormality of the switching element; and specifies that the first current sensor is in an abnormal state, in a case where there is no abnormal state switching elements.
    Type: Grant
    Filed: May 14, 2019
    Date of Patent: February 4, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuhiro Fujioka, Nobuhiro Kihara, Mai Nakada, Yoshihiro Takeshima, Yujiro Nakada
  • Patent number: 10541622
    Abstract: An electric motor drive device includes a smoothing capacitor and an inverter, and further includes an overvoltage protection unit for overvoltage protection for the smoothing capacitor, and a phase short-circuit control unit. The overvoltage protection unit includes: a discharge circuit having a discharge resistor and an IGBT connected in series; and a first determination circuit which determines, with determination delay, that smoothing capacitor voltage exceeds first set voltage, and turns on the IGBT. The phase short-circuit control unit is provided in a control device for drive-controlling the inverter and includes a second determination circuit which determines, with a determination period longer than the determination delay of the first determination circuit, that smoothing capacitor voltage exceeds second set voltage lower than the first set voltage, to perform phase short-circuit control for the inverter.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: January 21, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kohei Onda, Yoshihiro Takeshima, Hiroyasu Iwabuki, Masahiro Iezawa, Ryo Shinohara, Hideki Sugita
  • Publication number: 20200007027
    Abstract: [Technical Problem] In a power conversion device for stepping up or stepping down the input voltage, when voltage converter become out of order, it is not possible to specify an IGBT element and a current sensor, which is in an extraordinary fault condition. [Solution to Problem] The power conversion device is configured to detect a voltage value of a smoothing condenser, connected in parallel to a load, where the load is to be connected to the power conversion device; detects, by a first current sensor, a current which flows through switching elements in a plurality of voltage converter; decides an abnormality of a switching element, by switching the switching element one by one; specifies the abnormality of the switching element; and specifies that the first current sensor is in an abnormal state, in a case where there is no abnormal state switching elements.
    Type: Application
    Filed: May 14, 2019
    Publication date: January 2, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kazuhiro FUJIOKA, Nobuhiro Kihara, Mai Nakada, Yoshihiro Takeshima, Yujiro Nakada
  • Patent number: 10404170
    Abstract: A power supply unit includes: a first rectifying device connected to the direct current power source, a second rectifying device having an anode connected to the first rectifying device, a first condenser having one end connected to the second rectifying device, a second condenser connected to the second rectifying device, a third rectifying device having an anode connected to the second rectifying device, a resonance reactor connected to the third rectifying device and connected to the first condenser, s switching device connected to the direct current power source and connected the third rectifying device, an output reactor connected to the third rectifying device, an output condenser connected to the direct current power source and connected to the output reactor, an output rectifying device connected to the first condenser and connected to the direct current power source, a control circuit sending a gate signal to the switching device.
    Type: Grant
    Filed: April 2, 2015
    Date of Patent: September 3, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mai Uenaka, Yuuya Tanaka, Masaki Yamada, Yoshihiro Takeshima
  • Publication number: 20190149063
    Abstract: An electric motor drive device includes a smoothing capacitor and an inverter, and further includes an overvoltage protection unit for overvoltage protection for the smoothing capacitor, and a phase short-circuit control unit. The overvoltage protection unit includes: a discharge circuit having a discharge resistor and an IGBT connected in series; and a first determination circuit which determines, with determination delay, that smoothing capacitor voltage exceeds first set voltage, and turns on the IGBT. The phase short-circuit control unit is provided in a control device for drive-controlling the inverter and includes a second determination circuit which determines, with a determination period longer than the determination delay of the first determination circuit, that smoothing capacitor voltage exceeds second set voltage lower than the first set voltage, to perform phase short-circuit control for the inverter.
    Type: Application
    Filed: March 8, 2017
    Publication date: May 16, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kohei ONDA, Yoshihiro TAKESHIMA, Hiroyasu IWABUKI, Masahiro IEZAWA, Ryo SHINOHARA, Hideki SUGITA
  • Publication number: 20180183318
    Abstract: A power supply unit includes: a first rectifying device connected to the direct current power source, a second rectifying device having an anode connected to the first rectifying device, a first condenser having one end connected to the second rectifying device, a second condenser connected to the second rectifying device, a third rectifying device having an anode connected to the second rectifying device, a resonance reactor connected to the third rectifying device and connected to the first condenser, s switching device connected to the direct current power source and connected the third rectifying device, an output reactor connected to the third rectifying device, an output condenser connected to the direct current power source and connected to the output reactor, an output rectifying device connected to the first condenser and connected to the direct current power source, a control circuit sending a gate signal to the switching device.
    Type: Application
    Filed: April 2, 2015
    Publication date: June 28, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Mai UENAKA, Yuuya TANAKA, Masaki YAMADA, Yoshihiro TAKESHIMA
  • Patent number: 9975449
    Abstract: A power convertor including an inverter driving a motor generator, a first DC/DC converter connected to a DC bus of the inverter, a second DC/DC converter varying voltage of the DC bus, and a control device controlling the inverter, the first DC/DC converter, and the second DC/DC converter. The power converter is a power conversion device setting voltage of the DC bus in a second control state higher than a voltage of the DC bus in a first control state by controlling the second DC/DC converter according to the control device. By setting the voltage of the DC bus of the inverter to a low voltage when it is not necessary, it is possible to reduce loss in the inverter and the step-down DC/DC converter, and to downsize the inverter and the step-down DC/DC converter.
    Type: Grant
    Filed: January 14, 2016
    Date of Patent: May 22, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshihiro Takeshima, Masaki Yamada
  • Patent number: 9893619
    Abstract: A DC/DC converter in which a both-end voltage of each of capacitors can be safely uniformalized while an over current, which is passed through between the capacitors composing the DC/DC converter, is prevented. In a DC/DC converter which includes a plurality of switching elements, a reactor, a low-voltage side capacitor, a high-voltage side capacitor, a charge-discharge capacitor, and a controller which drives and controls the switching elements, the controller performs soft start control in which a duty ratio of at least one of the switching elements is gradually varied from 0% to 100%, and the switching element, in which the soft start control is not performed during the term of the soft start control, is turned off.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: February 13, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Nobuhiro Kihara, Noriyuki Wada, Mitsuyasu Kunihiro, Makoto Akashi, Yuta Komatsu, Satoshi Murakami, Yoshihiro Takeshima
  • Publication number: 20170305298
    Abstract: A power convertor including an inverter driving a motor generator, a first DC/DC converter connected to a DC bus of the inverter, a second DC/DC converter varying voltage of the DC bus, and a control device controlling the inverter, the first DC/DC converter, and the second DC/DC converter. The power converter is a power conversion device setting voltage of the DC bus in a second control state higher than a voltage of the DC bus in a first control state by controlling the second DC/DC converter according to the control device. By setting the voltage of the DC bus of the inverter to a low voltage when it is not necessary, it is possible to reduce loss in the inverter and the step-down DC/DC converter, and to downsize the inverter and the step-down DC/DC converter.
    Type: Application
    Filed: January 14, 2016
    Publication date: October 26, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshihiro TAKESHIMA, Masaki YAMADA