Patents by Inventor Akihiko Kanouda

Akihiko Kanouda 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: 11201559
    Abstract: The power conversion device includes multiple converter cells. Each converter cell includes a pair of primary-side terminals and a pair of secondary-side terminals. The converter cell transmits power between the pair of primary-side terminals and the pair of secondary-side terminals. The primary-side terminals of the multiple converter cells are connected in series to a primary-side power supply system. The secondary-side terminals of the multiple converter cells are connected in series to a secondary-side power supply system. Among the multiple converter cells, the converter cell in which an absolute value of a ground voltage appearing in the pair of primary-side terminals is the highest is different from the converter cell in which an absolute value of a ground voltage appearing in the pair of secondary-side terminals is the highest.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: December 14, 2021
    Assignee: Hitachi, Ltd.
    Inventors: Kimihisa Furukawa, Yuuichi Mabuchi, Yuki Kawaguchi, Akihiko Kanouda
  • Patent number: 11152870
    Abstract: A power conversion device that suppresses voltage pulsation of a capacitor of a power converter with respect to a control target whose effective power is to be controlled is provided. The power conversion device includes a plurality of power conversion cells that are connected to each other, and convert a primary-side system voltage into a secondary-side system voltage, a capacitor that is connected to each of the plurality of power conversion cells, and a power conversion cell driver that drives the power conversion cells to add a 3N order higher-harmonic-wave voltage of each of alternating voltages of the plurality of power conversion cells to the each of alternating voltages, and output a voltage made by adding the each of alternating voltages and the 3N order higher-harmonic-wave voltage, when N is a natural number.
    Type: Grant
    Filed: October 4, 2018
    Date of Patent: October 19, 2021
    Assignee: Hitachi Industrial Products, Ltd.
    Inventors: Kimihisa Furukawa, Akihiko Kanouda, Yuuichi Mabuchi, Hiroyuki Shoji, Takae Shimada, Mitsuhiro Kadota, Mizuki Nakahara
  • Publication number: 20210305903
    Abstract: An object of the present invention is to sufficiently reduce a switching loss. A control device causes a positive electrode of a first voltage to appear at a second connection point by switching second and third switching elements to an ON state. Next, the control device causes the positive electrode of the first voltage to appear at a first connection point by switching the second and third switching elements to an OFF state. After that, fifth and eighth switching elements are switched to the OFF state, and sixth and seventh switching elements are switched to the ON state.
    Type: Application
    Filed: December 21, 2016
    Publication date: September 30, 2021
    Inventors: Kimihisa FURUKAWA, Shintaro TANAKA, Takae SHIMADA, Akihiko KANOUDA, Mizuki NAKAHARA, Yuuichi MABUCHI
  • Publication number: 20210143744
    Abstract: The power conversion device includes multiple converter cells. Each converter cell includes a pair of primary-side terminals and a pair of secondary-side terminals. The converter cell transmits power between the pair of primary-side terminals and the pair of secondary-side terminals. The primary-side terminals of the multiple converter cells are connected in series to a primary-side power supply system. The secondary-side terminals of the multiple converter cells are connected in series to a secondary-side power supply system. Among the multiple converter cells, the converter cell in which an absolute value of a ground voltage appearing in the pair of primary-side terminals is the highest is different from the converter cell in which an absolute value of a ground voltage appearing in the pair of secondary-side terminals is the highest.
    Type: Application
    Filed: June 14, 2017
    Publication date: May 13, 2021
    Inventors: Kimihisa FURUKAWA, Yuuichi MABUCHI, Yuki KAWAGUCHI, Akihiko KANOUDA
  • Publication number: 20210044212
    Abstract: A power conversion device that suppresses voltage pulsation of a capacitor of a power converter with respect to a control target whose effective power is to be controlled is provided. The power conversion device includes a plurality of power conversion cells that are connected to each other, and convert a primary-side system voltage into a secondary-side system voltage, a capacitor that is connected to each of the plurality of power conversion cells, and a power conversion cell driver that drives the power conversion cells to add a 3N order higher-harmonic-wave voltage of each of alternating voltages of the plurality of power conversion cells to the each of alternating voltages, and output a voltage made by adding the each of alternating voltages and the 3N order higher-harmonic-wave voltage, when N is a natural number.
    Type: Application
    Filed: October 4, 2018
    Publication date: February 11, 2021
    Inventors: Kimihisa FURUKAWA, Akihiko KANOUDA, Yuuichi MABUCHI, Hiroyuki SHOJI, Takae SHIMADA, Mitsuhiro KADOTA, Mizuki NAKAHARA
  • Patent number: 10862311
    Abstract: A power conversion device includes three first power conversion cells each converting input power and outputting the converted power and having input terminals connected in parallel regarding a first power supply and three second power conversion cells each converting input power and outputting the converted power and having input terminals connected in parallel regarding a second power supply, wherein: the power output from the cell and the power output from the cell are combined to output a first phase power; the power output from the cell and the power output from the cell are combined to output a second phase power; and the power output from the cell and the power output from the cell are combined to output a third phase power. The first phase, second phase, and third phase powers are output as the phase powers or inter-line powers of a three-phase system.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: December 8, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Mitsuhiro Kadota, Akihiko Kanouda, Yasuaki Norimatsu, Takae Shimada
  • Patent number: 10615715
    Abstract: In a power conversion device, a power conversion unit includes a single-phase inverter on a secondary side of a resonant type converter that has an input of a direct current. A power conversion unit group is configured by connecting outputs of the single-phase inverters of a plurality of power conversion units in series. Respective phases of three phase alternate current are formed with the three power conversion unit groups housed in a power conversion device housing. The plurality of power conversion units constituting the power conversion unit group are disposed along a longitudinal direction of the power conversion device housing. The respective three power conversion unit groups are disposed at an upper stage, a middle stage, and a lower stage in a height direction of the power conversion device housing. The power conversion device housing has one end side in the longitudinal direction as output terminals of the three power conversion unit groups.
    Type: Grant
    Filed: September 6, 2016
    Date of Patent: April 7, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Yasuaki Norimatsu, Akihiko Kanouda, Yuuichi Mabuchi, Takae Shimada, Mitsuhiro Kadota, Yuki Kawaguchi, Mizuki Nakahara, Akira Yonekawa
  • Publication number: 20190199100
    Abstract: A power conversion device includes three first power conversion cells each converting input power and outputting the converted power and having input terminals connected in parallel regarding a first power supply and three second power conversion cells each converting input power and outputting the converted power and having input terminals connected in parallel regarding a second power supply, wherein: the power output from the cell and the power output from the cell are combined to output a first phase power; the power output from the cell and the power output from the cell are combined to output a second phase power; and the power output from the cell and the power output from the cell are combined to output a third phase power. The first phase, second phase, and third phase powers are output as the phase powers or inter-line powers of a three-phase system.
    Type: Application
    Filed: October 5, 2016
    Publication date: June 27, 2019
    Inventors: Mitsuhiro KADOTA, Akihiko KANOUDA, Yasuaki NORIMATSU, Takae SHIMADA
  • Publication number: 20190199238
    Abstract: In a power conversion device, a power conversion unit includes a single-phase inverter on a secondary side of a resonant type converter that has an input of a direct current. A power conversion unit group is configured by connecting outputs of the single-phase inverters of a plurality of power conversion units in series. Respective phases of three phase alternate current are formed with the three power conversion unit groups housed in a power conversion device housing. The plurality of power conversion units constituting the power conversion unit group are disposed along a longitudinal direction of the power conversion device housing. The respective three power conversion unit groups are disposed at an upper stage, a middle stage, and a lower stage in a height direction of the power conversion device housing. The power conversion device housing has one end side in the longitudinal direction as output terminals of the three power conversion unit groups.
    Type: Application
    Filed: September 6, 2016
    Publication date: June 27, 2019
    Inventors: Yasuaki NORIMATSU, Akihiko KANOUDA, Yuuichi MABUCHI, Takae SHIMADA, Mitsuhiro KADOTA, Yuki KAWAGUCHI, Mizuki NAKAHARA, Akira YONEKAWA
  • Patent number: 9887638
    Abstract: If an input voltage of a DC/DC converter is lower than a first voltage value that is set in advance, a converter controller maintains an output voltage of the DC/DC converter within a first voltage range that is set in advance by changing an operation frequency of switching of the DC/DC converter in compliance with the input voltage as a first voltage maintaining control. If the input voltage is higher than a second voltage value that is higher than the first voltage value, the converter controller maintains the output voltage within a second voltage range that is higher than the first voltage range by changing the operation frequency in compliance with the input voltage as a second voltage maintaining control.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: February 6, 2018
    Assignee: Hitachi, Ltd.
    Inventors: Yasuaki Norimatsu, Akihiko Kanouda, Yuuichi Mabuchi, Tadahiko Chida, Takuya Ishigaki, Takae Shimada
  • Patent number: 9806622
    Abstract: Reduction in size and weight of transformer for grid tie applications is demanded and can be achieved by applying SST to the transformer. However, SST application to PCS for sunlight requires the following: handle a wide variation range of the voltage of solar power generation; reduce switching losses of power devices, DC/DC converter and inverter, in the power circuit to implement high frequency for SST application; increase voltage to the grid voltage; and reduce the dimensions of the high current path prior to step-up. Thus, LLC resonant converter configuration is applied with an inverter placed in the output, and series connected configuration is applied to the inverter. The LLC resonant converter is subject to constant frequency regulation with large output, step-up control with low output, and step-down control with the upper limit voltage according to MPPT voltage from sunlight, in order to achieve drive loss reduction and voltage range handling.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: October 31, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Yasuaki Norimatsu, Akihiko Kanouda, Yuuichi Mabuchi, Tadahiko Chida, Takuya Ishigaki, Takae Shimada
  • Patent number: 9750125
    Abstract: Size and weight reduction of a transformer for system interconnection is needed. Applying an SST to the transformer can reduce the size and weight. However, it is also necessary to flexibly handle a wide range of voltages to match a high-voltage system or motor, reduce switching loss of a power device used in a power circuit such as a DC/DC converter and an inverter in association with frequency increase caused by application of the SST, and achieve size reduction of a cooling structure. Further, it is necessary to boost a voltage to a system voltage and reduce the size and weight of a large current path before the voltage boosting. Thus, an LLC resonant converter structure is applied, and a multiple-connection structure is employed in each of which a converter is arranged for an input or an inverter is arranged for an output. This enables handling of various voltage ranges by various combinations of the numbers of multiple connections of the inputs and the outputs.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: August 29, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Yasuaki Norimatsu, Akihiko Kanouda, Yuuichi Mabuchi, Takuya Ishigaki, Takae Shimada
  • Publication number: 20160352229
    Abstract: Reduction in size and weight of transformer for grid tie applications is demanded and can be achieved by applying SST to the transformer. However, SST application to PCS for sunlight requires the following: handle a wide variation range of the voltage of solar power generation; reduce switching losses of power devices, DC/DC converter and inverter, in the power circuit to implement high frequency for SST application; increase voltage to the grid voltage; and reduce the dimensions of the high current path prior to step-up. Thus, LLC resonant converter configuration is applied with an inverter placed in the output, and series connected configuration is applied to the inverter. The LLC resonant converter is subject to constant frequency regulation with large output, step-up control with low output, and step-down control with the upper limit voltage according to MPPT voltage from sunlight, in order to achieve drive loss reduction and voltage range handling.
    Type: Application
    Filed: May 19, 2016
    Publication date: December 1, 2016
    Inventors: Yasuaki NORIMATSU, Akihiko KANOUDA, Yuuichi MABUCHI, Tadahiko CHIDA, Takuya ISHIGAKI, Takae SHIMADA
  • Publication number: 20160352230
    Abstract: Size and weight reduction of a transformer for system interconnection is needed. Applying an SST to the transformer can reduce the size and weight. However, it is also necessary to flexibly handle a wide range of voltages to match a high-voltage system or motor, reduce switching loss of a power device used in a power circuit such as a DC/DC converter and an inverter in association with frequency increase caused by application of the SST, and achieve size reduction of a cooling structure. Further, it is necessary to boost a voltage to a system voltage and reduce the size and weight of a large current path before the voltage boosting. Thus, an LLC resonant converter structure is applied, and a multiple-connection structure is employed in each of which a converter is arranged for an input or an inverter is arranged for an output. This enables handling of various voltage ranges by various combinations of the numbers of multiple connections of the inputs and the outputs.
    Type: Application
    Filed: May 19, 2016
    Publication date: December 1, 2016
    Inventors: Yasuaki NORIMATSU, Akihiko KANOUDA, Yuuichi MABUCHI, Takuya ISHIGAKI, Takae SHIMADA
  • Publication number: 20160254758
    Abstract: If an input voltage of a DC/DC converter is lower than a first voltage value that is set in advance, a converter controller maintains an output voltage of the DC/DC converter within a first voltage range that is set in advance by changing an operation frequency of switching of the DC/DC converter in compliance with the input voltage as a first voltage maintaining control. If the input voltage is higher than a second voltage value that is higher than the first voltage value, the converter controller maintains the output voltage within a second voltage range that is higher than the first voltage range by changing the operation frequency in compliance with the input voltage as a second voltage maintaining control.
    Type: Application
    Filed: February 24, 2016
    Publication date: September 1, 2016
    Inventors: Yasuaki NORIMATSU, Akihiko KANOUDA, Yuuichi MABUCHI, Tadahiko CHIDA, Takuya ISHIGAKI, Takae SHIMADA
  • Patent number: 9306472
    Abstract: A power supply device of the invention includes a first switching leg including first and second switching elements between DC terminals; a second switching leg including third and fourth switching elements between the DC terminals; a first capacitor leg including first and second capacitors between the DC terminals; a second capacitor leg including third and fourth capacitors between AC terminals; a first inductor between a connection of the first and second switching elements and one of the AC terminals; a second inductor between a connection of the third and fourth switching elements and another of the AC terminals; a controller; an AC power supply connected to the AC terminals and the connection of the third and fourth capacitors; and a DC power supply between the DC terminals, wherein the controller charges the first and second capacitors to a voltage higher than a voltage crest of the AC power supply.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: April 5, 2016
    Assignee: HITACHI INFORMATION & TELECOMMUNICATION ENGINEERING, LTD.
    Inventors: Takae Shimada, Akihiko Kanouda, Fumikazu Takahashi, Nobuyuki Aihara
  • Patent number: 9246337
    Abstract: A battery pack includes a plurality of battery units mutually connected in parallel, each including a cell group in which one or two or more secondary cells are connected in series, and a first current control element that is connected in series with this cell group, a first control means that controls the charging/discharging current for each battery unit by controlling the operation of the first current control element included in each of the battery unit; a voltage measurement means that measures the voltage of the cell group or cells included in each of the battery unit, and a diagnosis means that diagnoses a deterioration level or a fault of each battery unit on the basis of the voltage of the cell group or cells measured by the voltage measurement means.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: January 26, 2016
    Assignee: HITACHI, LTD.
    Inventors: Hiroshi Iwasawa, Akihiko Emori, Yutaka Kobayashi, Ko Takahashi, Akihiko Kanouda
  • Patent number: 9231424
    Abstract: Disclosed is a charging system for both plug-in charging systems and contactless charging systems, having a simple electrical configuration, and capable of achieving miniaturization and weight saving. The charging system includes a secondary cell charged via first/second coils of a transformer to which electrical power is supplied from a first power supply via a plug-in connector, and a third coil supplied with electrical power from a second power supply, a relative position of which to the second coil of the transformer is variable, and which can be magnetically coupled to the second coil when the second coil approaches the third coil, wherein the secondary cell is charged via magnetic coupling between first/second coils when charging the secondary cell by the first power supply, and the secondary cell is charged via magnetic coupling between the third coil and second coils when charging the secondary cell by the second power supply.
    Type: Grant
    Filed: May 25, 2011
    Date of Patent: January 5, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Yuki Kawaguchi, Takae Shimada, Satoshi Asano, Akihiko Kanouda
  • Patent number: 9166501
    Abstract: A highly efficient power supply unit compatible with a single-phase three-wire system and an operating method of such a power supply unit are provided. The power supply unit includes first and second switching legs connected in parallel to a first capacitor leg with a DC power supply connected thereto. One end of the second capacitor leg is connected to the middle point of the first switching leg through a first inductor, and the other end is connected to the middle point of the second switching leg through a second inductor. The two ends of the second capacitor leg and the middle point of the second capacitor leg are defined as AC terminals. A switch is provided between middle points of first and second capacitor legs. A control part sets the switch to OFF when power is input/output only between one end of the second capacitor leg and the other end.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: October 20, 2015
    Assignee: Hitachi Information & Telecommunication Engineering, Ltd.
    Inventors: Takae Shimada, Akihiko Kanouda, Nobuyuki Aihara, Yoshihide Takahashi
  • Publication number: 20150029772
    Abstract: A power supply device of the invention includes a first switching leg including first and second switching elements between DC terminals; a second switching leg including third and fourth switching elements between the DC terminals; a first capacitor leg including first and second capacitors between the DC terminals; a second capacitor leg including third and fourth capacitors between AC terminals; a first inductor between a connection of the first and second switching elements and one of the AC terminals; a second inductor between a connection of the third and fourth switching elements and another of the AC terminals; a controller; an AC power supply connected to the AC terminals and the connection of the third and fourth capacitors; and a DC power supply between the DC terminals, wherein the controller charges the first and second capacitors to a voltage higher than a voltage crest of the AC power supply.
    Type: Application
    Filed: July 25, 2014
    Publication date: January 29, 2015
    Inventors: Takae SHIMADA, Akihiko KANOUDA, Fumikazu TAKAHASHI, Nobuyuki AIHARA