Patents by Inventor Yuusuke KOUNO

Yuusuke KOUNO 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).

  • Publication number: 20220255443
    Abstract: According to an embodiment, a power conversion apparatus includes a transformer, an inverter, a rectifier, a first voltage detector, a second voltage detector, and a control unit. The inverter includes a switch and outputs AC voltage to the primary side of the transformer by an ON/OFF operation of the switch. The rectifier converts the AC voltage from the secondary side of the transformer into DC output voltage. The first voltage detector detects input voltage input to the inverter. The second voltage detector detects the output voltage. The control unit sets, on the basis of the input voltage and the output voltage, permissible ON time for which the switch is set to an ON state such that a value of current output from the inverter does not exceed an upper limit value.
    Type: Application
    Filed: February 8, 2022
    Publication date: August 11, 2022
    Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Infrastructure Systems & Solutions Corporation
    Inventors: Yuusuke KOUNO, Toshiyuki BABA
  • Publication number: 20210288592
    Abstract: An apparatus according to an embodiment includes a control circuit to control operations of an inverter and a switch. The control circuit judges whether or not a power system has a power failure, based on values of the system voltage and a frequency of the power system; and calculates a phase difference between a phase of the output voltage of the inverter and a phase of the system voltage and generate, by means of the phase difference, an output frequency pattern for changing a frequency of the output voltage of the inverter. The control circuit, when it is judged that the power system has recovered from the power failure, controls the inverter to change the frequency of the output voltage of the inverter in line with the output frequency pattern, and closes the switch after the phase difference becomes smaller than or equal to a threshold.
    Type: Application
    Filed: October 19, 2020
    Publication date: September 16, 2021
    Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Infrastructure Systems & Solutions Corporation
    Inventors: Yuusuke KOUNO, Yoichi MORISHIMA
  • Patent number: 10027242
    Abstract: A vehicle power conversion device includes a two-level converter, a three-level converter and one cooling device. The two-level converter includes a capacitor, first switching devices and second switching devices. The three-level converter includes two capacitors, third switching devices, fourth switching devices and a bidirectional switch. The first and second switching devices are embedded in first power modules, and the third and fourth switching devices are embedded in second power modules. The second power modules have dielectric strength voltages at least equal to a voltage applicable to any one of the two capacitors connected in series included in the three-level converter, and the first power modules have dielectric strength voltages at least equal to a sum of a voltage applicable to any one of the two capacitors connected in series included in the three-level converter and a voltage applicable to the capacitor included in the two-level converter.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: July 17, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuusuke Kouno, Masayuki Nogi, Nobumitsu Tada, Yuuki Tsukinari, Yosuke Nakazawa, Tomoyuki Makino
  • Patent number: 9998029
    Abstract: According to one embodiment, an inverter including a detector which detects a value of an output voltage and a value of an output current; a command value input unit which is capable of receiving a current command value; a current command value compensating unit which, when the value of the output voltage detected by the detector is equal to or lower than a predetermined value, computes a compensation current value for compensating the current command value; an adder which adds the compensation current value to the current command value and outputs the compensated current command value; and a current controller which computes a voltage command value so that a difference between the compensated current command value and the output current detected by the detector becomes zero.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: June 12, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuusuke Kouno, Yoichi Morishima
  • Publication number: 20170353127
    Abstract: According to one embodiment, an inverter including a detector which detects a value of an output voltage and a value of an output current; a command value input unit which is capable of receiving a current command value; a current command value compensating unit which, when the value of the output voltage detected by the detector is equal to or lower than a predetermined value, computes a compensation current value for compensating the current command value; an adder which adds the compensation current value to the current command value and outputs the compensated current command value; and a current controller which computes a voltage command value so that a difference between the compensated current command value and the output current detected by the detector becomes zero.
    Type: Application
    Filed: May 30, 2017
    Publication date: December 7, 2017
    Inventors: Yuusuke Kouno, Yoichi Morishima
  • Publication number: 20170170744
    Abstract: A vehicle power conversion device includes a two-level converter, a three-level converter and one cooling device. The two-level converter includes a capacitor, first switching devices and second switching devices. The three-level converter includes two capacitors, third switching devices, fourth switching devices and a bidirectional switch. The first and second switching devices are embedded in first power modules, and the third and fourth switching devices are embedded in second power modules. The second power modules have dielectric strength voltages at least equal to a voltage applicable to any one of the two capacitors connected in series included in the three-level converter, and the first power modules have dielectric strength voltages at least equal to a sum of a voltage applicable to any one of the two capacitors connected in series included in the three-level converter and a voltage applicable to the capacitor included in the two-level converter.
    Type: Application
    Filed: July 31, 2014
    Publication date: June 15, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuusuke KOUNO, Masayuki NOGI, Nobumitsu TADA, Yuuki TSUKINARI, Yosuke NAKAZAWA, Tomoyuki MAKINO
  • Patent number: 9643496
    Abstract: According to an embodiment, a power conversion apparatus for a vehicle is provided with a single-phase two-level converter and a single-phase three-level converter. The single-phase two-level converter is composed of a capacitor, first to fourth controllable switching devices, diodes connected in antiparallel with the controllable switching devices, respectively. The single-phase three-level converter is composed of two series-connected capacitors, fifth to tenth controllable switching devices, diodes connected in antiparallel with the controllable switching devices, respectively. The single-phase two-level converter and the single-phase three-phase converter are connected in series at the AC input/output points. The single-phase two-level converter has smaller switching loss than the single-phase three-level converter, and the single-phase three-level converter has higher withstand voltage property than the single-phase two-level converter.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: May 9, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuusuke Kouno, Yosuke Nakazawa, Kentaro Suzuki, Ryuta Hasegawa, Tomoyuki Makino
  • Patent number: 9450509
    Abstract: A power conversion apparatus comprises a first converter connected to a second converter. The first converter includes a first capacitor and the second converter includes a second capacitor connected in series to a third capacitor. The capacitors are each connected in parallel with a respective resistor. The power conversion apparatus also includes a bypass switch connected in parallel to the first converter and in series to the second converter. A control module is configured to control a single-phase output voltage by operation of the first converter, the second converter, and the bypass switch.
    Type: Grant
    Filed: January 23, 2014
    Date of Patent: September 20, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuusuke Kouno, Yosuke Nakazawa, Kentaro Suzuki, Ryuta Hasegawa, Tomoyuki Makino
  • Patent number: 9413224
    Abstract: A power conversion device includes a main circuit unit, a first current detector, a second current detector, a voltage detector, and a controller. The main circuit unit is connected to a DC voltage source and an AC power system. The main circuit unit includes an inverter including a plurality of switching elements. The main circuit unit converts a DC power to an AC power. The controller decides that whether the output current of the inverter falls within a range between an upper limit value and a lower limit value, stop an operation of the switching elements when the output current of the inverter falls beyond the range, and resume the operation of the switching elements when the output current of the inverter returns into the range.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: August 9, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuusuke Kouno, Yoichi Morishima, Yoshinori Sugimoto, Takao Suginohara, Teruya Hamai, Hiroaki Matsumoto
  • Publication number: 20160077142
    Abstract: According to one embodiment, a power electronics device has an output connected to an output of a different power electronics device by a power line. The power electronics device includes a detector to detect, from the power line or a space around the power electronics device, an electric power that the different power electronics device superimposes onto an output power, or at least one of an electric power, a sound, and an electromagnetic wave, each having a frequency of a carrier wave that the different power electronics device uses for power conversion. The power electronics device includes a determiner to determine a state of the different power electronics device based on a detection signal obtained through detection performed by the detector.
    Type: Application
    Filed: September 14, 2015
    Publication date: March 17, 2016
    Inventors: Fumiaki KANAYAMA, Yuusuke KOUNO, Yasuyuki NISHIBAYASHI
  • Publication number: 20150280546
    Abstract: A power conversion device includes a main circuit unit, a first current detector, a second current detector, a voltage detector, and a controller. The main circuit unit is connected to a DC voltage source and an AC power system. The main circuit unit includes an inverter including a plurality of switching elements. The main circuit unit converts a DC power to an AC power. The controller decides that whether the output current of the inverter falls within a range between an upper limit value and a lower limit value, stop an operation of the switching elements when the output current of the inverter falls beyond the range, and resume the operation of the switching elements when the output current of the inverter returns into the range.
    Type: Application
    Filed: February 24, 2015
    Publication date: October 1, 2015
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Yuusuke KOUNO, Yoichi MORISHIMA, Yoshinori SUGIMOTO, Takao SUGINOHARA, Teruya HAMAl, Hiroaki MATSUMOTO
  • Publication number: 20150270712
    Abstract: According to one embodiment, a controlling apparatus comprises an acquiring unit that acquires a power value of a power line, the power line transmitting power between a first grid and a second grid, the first grid including a first power generating apparatus and a power converting apparatus that outputs an alternating-current power based on a power generated by the first power generating apparatus, the second grid including a second power generating apparatus. The controlling apparatus comprises a controlling unit that controls the alternating-current power to be output by the power converting apparatus such that the power value does not fall within a dead band.
    Type: Application
    Filed: March 16, 2015
    Publication date: September 24, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Fumiaki KANAYAMA, Yuusuke KOUNO, Yasuyuki NISHIBAYASHI, Yoichi MORISHIMA
  • Publication number: 20150076903
    Abstract: According to one embodiment, a controlling apparatus includes a power phase controlling unit to control the phase of the power to be output to the power line by the power converting apparatus, based on the synchronous signal, and when a disruption of the synchronous signal is detected, control the phase of the power to be output to the power line by the power converting apparatus, based on the synchronous signal received before the disruption. The controlling apparatus includes a communication controlling unit to control the communicating unit such that, for information to determine a master that sends the synchronous signal, the communicating unit performs either one of a receiving from the controlling apparatus for the other power converting apparatus and a sending to the controlling apparatus for the other power converting apparatus, while the power phase controlling unit performs the control based on the synchronous signal received before the disruption.
    Type: Application
    Filed: September 15, 2014
    Publication date: March 19, 2015
    Inventors: Fumiaki Kanayama, Yuusuke Kouno, Masayuki Nogi, Yasuyuki Nishibayashi, Ikuya Aoyama
  • Publication number: 20140375121
    Abstract: According to an embodiment, a power conversion apparatus for a vehicle is provided with a single-phase two-level converter and a single-phase three-level converter. The single-phase two-level converter is composed of a capacitor, first to fourth controllable switching devices, diodes connected in antiparallel with the controllable switching devices, respectively. The single-phase three-level converter is composed of two series-connected capacitors, fifth to tenth controllable switching devices, diodes connected in antiparallel with the controllable switching devices, respectively. The single-phase two-level converter and the single-phase three-phase converter are connected in series at the AC input/output points. The single-phase two-level converter has smaller switching loss than the single-phase three-level converter, and the single-phase three-level converter has higher withstand voltage property than the single-phase two-level converter.
    Type: Application
    Filed: September 5, 2014
    Publication date: December 25, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuusuke KOUNO, Yosuke NAKAZAWA, Kentaro SUZUKI, Ryuta HASEGAWA, Tomoyuki MAKINO
  • Publication number: 20140203632
    Abstract: A power conversion apparatus comprises a first converter connected to a second converter. The first converter includes a first capacitor and the second converter includes a second capacitor connected in series to a third capacitor. The capacitors are each connected in parallel with a respective resistor. The power conversion apparatus also includes a bypass switch connected in parallel to the first converter and in series to the second converter. A control module is configured to control a single-phase output voltage by operation of the first converter, the second converter, and the bypass switch.
    Type: Application
    Filed: January 23, 2014
    Publication date: July 24, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuusuke KOUNO, Yosuke NAKAZAWA, Kentaro SUZUKI, Ryuta HASEGAWA, Tomoyuki MAKINO