Patents by Inventor Hiroshi Kamizuma
Hiroshi Kamizuma 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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Publication number: 20240105543Abstract: There is provided a power conversion apparatus including a first power semiconductor module, a second power semiconductor module, a control circuit for driving the first power semiconductor module and the second power semiconductor module, and liquid-cooling type cooling jackets, wherein the second power semiconductor module is disposed closer to an upper surface in the gravity direction than the first power semiconductor module is, the cooling jackets include a refrigerant containing hydrogen molecules and a refrigerant flow path at least between the first power semiconductor module and the second power semiconductor module, and the control circuit performs control such that the operating time period of the second power semiconductor module is shorter than the operating time period of the first power semiconductor module.Type: ApplicationFiled: August 3, 2023Publication date: March 28, 2024Applicant: Hitachi, Ltd.Inventors: Hiroshi Kamizuma, Hangxian Gao, Tetsuya Kawashima, Masahiro Seo
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Publication number: 20240030824Abstract: An aspect of the present disclosure is a power conversion device including: a primary-side transformer to which a primary AC voltage is input from a primary-side circuit; and a secondary-side transformer that outputs a secondary AC voltage lower than the primary AC voltage to a secondary-side circuit. The primary-side transformer includes a primary-side primary winding to which the primary AC voltage is input, and a primary-side secondary winding to which power is transmitted from the primary-side primary winding. The secondary-side transformer includes a secondary-side primary winding constituting a closed circuit together with the primary-side secondary winding, and a secondary-side secondary winding to which power is transmitted from the secondary-side primary winding and which outputs the secondary AC voltage. The primary-side circuit and the closed circuit are connected to a common potential.Type: ApplicationFiled: July 14, 2023Publication date: January 25, 2024Inventors: Kimihisa FURUKAWA, Yuuichi MABUCHI, Takae SHIMADA, Mohammed Mosaddique Nawaz HUSSAIN, Hiroshi KAMIZUMA, Yuki KAWAGUCHI, Abhijit CHOUDHURY, Akihiko KANOUDA
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Publication number: 20230361691Abstract: Please substitute the new Abstract submitted herewith for the original Abstract: This power conversion unit includes a cooling path positioned between an input-side power converter and an output-side power converter arranged separately on two sides that face each other. The input-side and output-side power converters include: a mold resin filled into a space on the inside of housings; a switching element covered by the mold resin, an upper electrode plate connected to the switching element, and a heat dissipation plate having insulating properties connected to the upper electrode plate; and a lower electrode provided near the cooling path. The mold resin is an organopolysiloxane having a three-dimensionally crosslinked structure after curing, in which the elastic modulus at room temperature is 0.1 MPa or greater, and the value when the hardness after curing is 10 or greater as measured using a durometer type E.Type: ApplicationFiled: August 3, 2021Publication date: November 9, 2023Inventors: Ryou MOTEKI, Hisashi MOROOKA, Shintarou TAKEDA, Makoto ABE, Hiroshi KAMIZUMA, Kinya NAKATSU
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Publication number: 20230056704Abstract: Provided is a power conversion system that can suppress a fault in a short-circuiting switch that bypasses a fault unit and enhance the reliability and redundancy of the system. The power conversion system is provided with a plurality of power converter units that are formed by using semiconductor switch elements and are connected in series, and comprises: switch elements that are provided to input terminals and/or output terminals of the power converter units and bypass the power converter units; and overvoltage suppressing elements which are connected in parallel with the switch elements and in which conducting states are changed by an application of a prescribed voltage.Type: ApplicationFiled: February 25, 2021Publication date: February 23, 2023Inventors: Hajime URAI, Hiroshi KAMIZUMA, Kimihisa FURUKAWA, Noriya NAKAO, Kinya NAKATSU
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Patent number: 10141861Abstract: To improve accessibility with respect to a power conversion unit in a power converter. The power converter includes a circuit connection part including a positive electrode conductor, a negative electrode conductor and an AC conductor, a power semiconductor module positioned in a particular direction with respect to the circuit connection part and connected to the positive electrode conductor, the negative electrode conductor and the AC conductor and a capacitor positioned in the particular direction with respect to the circuit connection part and connected to the positive electrode conductor and the negative electrode conductor. The positive electrode conductor is connected to a positive electrode conductor of another power conversion unit through a unit connection part positioned in an opposite direction of the particular direction with respect to the circuit connection part.Type: GrantFiled: January 26, 2018Date of Patent: November 27, 2018Assignee: Hitachi, Ltd.Inventors: Yukio Hattori, Hiroshi Kamizuma, Daisuke Matsumoto, Akira Mima, Tetsuya Kawashima, Yuuichi Mabuchi
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Patent number: 10008953Abstract: An uninterruptible power-supply system is a power converter having a PN laminated bus bar and a plurality of power conversion units and supplying power from a commercial power supply via a converter and an inverter. The power conversion units each have positive side terminals connected to each other and negative side terminals connected to each other through the PN laminated bus bar. At least one power conversion unit constitutes a phase of the converter. At least another one power conversion unit constitutes a phase of the inverter and has the positive side terminal lying adjacent to and connected through the PN laminated bus bar to the positive side terminal of the corresponding power conversion unit constituting the phase of the converter and the negative side terminal lying adjacent to and connected to the negative side terminal of the corresponding power conversion unit constituting the phase of the converter.Type: GrantFiled: May 7, 2014Date of Patent: June 26, 2018Assignee: Hitachi, Ltd.Inventors: Hiroshi Kamizuma, Yukio Hattori, Tetsuya Kawashima, Akira Mima, Daisuke Matsumoto, Yuuichi Mabuchi
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Publication number: 20180152117Abstract: To improve accessibility with respect to a power conversion unit in a power converter. The power converter includes a circuit connection part including a positive electrode conductor, a negative electrode conductor and an AC conductor, a power semiconductor module positioned in a particular direction with respect to the circuit connection part and connected to the positive electrode conductor, the negative electrode conductor and the AC conductor and a capacitor positioned in the particular direction with respect to the circuit connection part and connected to the positive electrode conductor and the negative electrode conductor. The positive electrode conductor is connected to a positive electrode conductor of another power conversion unit through a unit connection part positioned in an opposite direction of the particular direction with respect to the circuit connection part.Type: ApplicationFiled: January 26, 2018Publication date: May 31, 2018Inventors: Yukio HATTORI, Hiroshi KAMIZUMA, Daisuke MATSUMOTO, Akira MIMA, Tetsuya KAWASHIMA, Yuuichi MABUCHI
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Patent number: 9948201Abstract: A module of conversion circuit includes a High side IGBT, a Low side IGBT connected in series to the High side IGBT, a first terminal connected to the High side IGBT, a second terminal connected to the Low side IGBT, a capacitor connected to the first terminal and the second terminal, and a third terminal connected to a connection point between the High side IGBT and the Low side IGBT. A fourth terminal is engaged with the first terminal. A fifth terminal is engaged with the second terminal. A sixth terminal is engaged with the third terminal. The first and second terminals have at portions thereof between front edges and rear edges high-resistance parts having higher resistance than other portions.Type: GrantFiled: February 22, 2016Date of Patent: April 17, 2018Assignee: Hitachi, Ltd.Inventors: Shinji Shirakawa, Hiroshi Kamizuma, Daisuke Matsumoto, Akira Mima, Yukio Hattori
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Patent number: 9917529Abstract: To improve accessibility with respect to a power conversion unit in a power converter. The power converter includes a circuit connection part including a positive electrode conductor, a negative electrode conductor and an AC conductor, a power semiconductor module positioned in a particular direction with respect to the circuit connection part and connected to the positive electrode conductor, the negative electrode conductor and the AC conductor and a capacitor positioned in the particular direction with respect to the circuit connection part and connected to the positive electrode conductor and the negative electrode conductor. The positive electrode conductor is connected to a positive electrode conductor of another power conversion unit through a unit connection part positioned in an opposite direction of the particular direction with respect to the circuit connection part.Type: GrantFiled: March 27, 2014Date of Patent: March 13, 2018Assignee: Hitachi, Ltd.Inventors: Yukio Hattori, Hiroshi Kamizuma, Daisuke Matsumoto, Akira Mima, Tetsuya Kawashima, Yuuichi Mabuchi
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Patent number: 9906154Abstract: The present invention reduces the footprint of a power conversion device. A first power semiconductor module and a second power semiconductor module are connected to a positive conductor, a negative conductor, and an alternating-current conductor. An external alternating-current terminal, the first power semiconductor module, the second power semiconductor module, a capacitor, and an external direct-current terminal including an external positive terminal and an external negative terminal are arrayed on a straight line extending in the longitudinal direction of a circuit connection section. The external alternating-current terminal is disposed at one longitudinal end of the circuit connection section. The external direct-current terminal is disposed at the other longitudinal end of the circuit connection section.Type: GrantFiled: March 2, 2015Date of Patent: February 27, 2018Assignee: Hitachi, Ltd.Inventors: Yukio Hattori, Hiroshi Kamizuma, Tetsuya Kawashima, Akira Mima, Daisuke Matsumoto, Yuuichi Mabuchi
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Patent number: 9898072Abstract: The power consumption of a data sampling unit that selects a phase of a clock signal appropriate for sampling payload data is reduced at an input interface. A semiconductor integrated circuit includes an input interface and internal core circuits. The input interface includes a hysteresis circuit and a data sampling unit. The hysteresis circuit detects an input signal between first and second input thresholds as a sleep command. The data sampling unit selects an appropriate phase of a sampling clock signal in accordance with a synchronizing signal and samples payload data. When a sleep command is detected, a sleep signal is also supplied to the internal core circuits and the data sampling unit and they are controlled into a low-power consumption state.Type: GrantFiled: December 2, 2014Date of Patent: February 20, 2018Assignee: Renesas Electronics CorporationInventors: Hiroshi Kamizuma, Taizo Yamawaki, Yukinori Akamine, Koji Maeda
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Publication number: 20180006573Abstract: An electrical power conversion unit is provided with: a circuit connecting part which includes a positive electrode conductor, a negative electrode conductor, and an alternating current conductor; a power semiconductor module connected to a specific side of the circuit connecting part; a fin that extends to the opposite side of the circuit connecting part with respect to the power semiconductor module; and a capacitor disposed at one end in the lengthwise direction of the circuit connecting part. A space in which a cooling fan is disposed is formed by an extending part and the fin, when the extending part is defined as a region, of the circuit connecting part, other than the portion at which the fin projects to the circuit connecting part, such region including one end that is opposite, via the fin, the one end where the capacitor is present.Type: ApplicationFiled: March 4, 2015Publication date: January 4, 2018Inventors: Yukio HATTORI, Hiroshi KAMIZUMA, Daisuke MATSUMOTO, Akira MIMA, Ryouhei MIYAGAWA
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Patent number: 9807913Abstract: A cooling structure of a heating element includes: the heating element having at least one cooling surface from which a plurality of pin fins project; a heat receiving plate which has a shape complying with the cooling surface and in which holes are formed at positions facing each pin fin, each pin fin being movably inserted into the holes; a cooler which has a pair of clamping members that sandwich therebetween the heating element and the heat receiving plate while pressing the heating element and the heat receiving plate, and which cools the heat receiving plate; and a space securing part which is provided on the heat receiving plate and suppresses a distance between the pair of clamping members so as not to apply a pressing force by the clamping members to the heating element.Type: GrantFiled: August 8, 2016Date of Patent: October 31, 2017Assignee: Hitachi, Ltd.Inventors: Daisuke Matsumoto, Akira Mima, Tetsuya Kawashima, Yuuichi Mabuchi, Yukio Hattori, Hiroshi Kamizuma, Ryouhei Miyagawa, Tomonori Ichikawa
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Patent number: 9755526Abstract: A power converter that can be made compact and lightweight is provided. The power converter includes a control circuit power supply, a power semiconductor module that includes power conversion elements, a control circuit board that operates with power from the control circuit power supply and controls the power conversion elements, and a capacitor connected to the power conversion elements. In the power converter, the control circuit power supply charges the capacitor through the control circuit board. With this configuration, hot swapping of the power converter from the converter system can be performed. A boosting circuit may boost voltage of the control circuit power supply to charge the capacitor.Type: GrantFiled: February 16, 2016Date of Patent: September 5, 2017Assignee: Hitachi, Ltd.Inventors: Akira Mima, Hiroshi Kamizuma
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Patent number: 9583264Abstract: A capacitor device includes: a film capacitor element that has a coiled body in which an insulating layer and an electrification layer are laminated and wound together, and a pair of collector electrodes that are formed upon two opposite end faces of the coiled body; a case that has a capacitor housing portion within which the film capacitor element is received; a pair of inserts having insulation properties, one of which is inserted between one of the pair of collector electrodes and one of inner walls of the capacitor housing portion; and a mass of sealing and insulating material that is charged between the film capacitor element and the one of the inner walls of the capacitor housing portion.Type: GrantFiled: March 5, 2014Date of Patent: February 28, 2017Assignee: Hitachi, Ltd.Inventors: Hiroshi Kamizuma, Kinya Nakatsu, Junpei Kusukawa, Takeshi Tokuyama
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Publication number: 20170040906Abstract: The present invention reduces the footprint of a power conversion device. A first power semiconductor module and a second power semiconductor module are connected to a positive conductor, a negative conductor, and an alternating-current conductor. An external alternating-current terminal, the first power semiconductor module, the second power semiconductor module, a capacitor, and an external direct-current terminal including an external positive terminal and an external negative terminal are arrayed on a straight line extending in the longitudinal direction of a circuit connection section. The external alternating-current terminal is disposed at one longitudinal end of the circuit connection section. The external direct-current terminal is disposed at the other longitudinal end of the circuit connection section.Type: ApplicationFiled: March 2, 2015Publication date: February 9, 2017Inventors: Yukio HATTORI, Hiroshi KAMIZUMA, Tetsuya KAWASHIMA, Akira MIMA, Daisuke MATSUMOTO, Yuuichi MABUCHI
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Publication number: 20170033593Abstract: An uninterruptible power-supply system is a power converter having a PN laminated bus bar and a plurality of power conversion units and supplying power from a commercial power supply via a converter and an inverter. The power conversion units each have positive side terminals connected to each other and negative side terminals connected to each other through the PN laminated bus bar. At least one power conversion unit constitutes a phase of the converter. At least another one power conversion unit constitutes a phase of the inverter and has the positive side terminal lying adjacent to and connected through the PN laminated bus bar to the positive side terminal of the corresponding power conversion unit constituting the phase of the converter and the negative side terminal lying adjacent to and connected to the negative side terminal of the corresponding power conversion unit constituting the phase of the converter.Type: ApplicationFiled: May 7, 2014Publication date: February 2, 2017Inventors: Hiroshi KAMIZUMA, Yukio HATTORI, Tetsuya KAWASHIMA, Akira MIMA, Daisuke MATSUMOTO, Yuuichi MABUCHI
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Patent number: 9532489Abstract: A power conversion device capable of reducing a temperature variation between a plurality of semiconductor modules is provided. The power conversion device comprises condensers 121, 122, a plurality of semiconductor modules 101, 102, heat dissipation units 103 to 109, a bus bar 140 connecting the condensers 121, 122 with the plurality of the semiconductor modules 101, 102, and a ventilation unit having cool wind blow. The power conversion module has features that the plurality of semiconductor modules 101, 102 are arranged apart from the condensers 121, 122 and in a line in a longitudinal direction of the bus bar 140 and that the cool wind 150 blows in a direction from the condensers 121, 122 toward the plurality of semiconductor modules 101, 102 that are mounted.Type: GrantFiled: June 25, 2015Date of Patent: December 27, 2016Assignee: Hitachi, Ltd.Inventors: Yuuichi Mabuchi, Tetsuya Kawashima, Daisuke Matsumoto, Akira Mima, Yukio Hattori, Hiroshi Kamizuma
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Publication number: 20160345463Abstract: A cooling structure of a heating element includes: the heating element having at least one cooling surface from which a plurality of pin fins project; a heat receiving plate which has a shape complying with the cooling surface and in which holes are formed at positions facing each pin fin, each pin fin being movably inserted into the holes; a cooler which has a pair of clamping members that sandwich therebetween the heating element and the heat receiving plate while pressing the heating element and the heat receiving plate, and which cools the heat receiving plate; and a space securing part which is provided on the heat receiving plate and suppresses a distance between the pair of clamping members so as not to apply a pressing force by the clamping members to the heating element.Type: ApplicationFiled: August 8, 2016Publication date: November 24, 2016Inventors: Daisuke MATSUMOTO, Akira MIMA, Tetsuya KAWASHIMA, Yuuichi MABUCHI, Yukio HATTORI, Hiroshi KAMIZUMA, Ryouhei MIYAGAWA, Tomonori ICHIKAWA
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Patent number: 9497887Abstract: A cooling structure is provided. The cooling structure includes cooling surfaces on two confronting side surfaces; a plurality of double-sided-cooling power module, the heat receiving block pinching the heating elements arranged in a vertical direction on the confronting side surfaces, first and second cooling devices, each including the heat radiating fins, disposed above the heating elements, extending in a horizontal direction, and a pressure contacting part configured to contact the heating elements and the receiving block with a pressure force. The heat radiation fins are blown from a side of the electric terminal.Type: GrantFiled: December 12, 2014Date of Patent: November 15, 2016Assignee: HITACHI, LTD.Inventors: Daisuke Matsumoto, Yuuichi Mabuchi, Akira Mima, Tetsuya Kawashima, Yukio Hattori, Hiroshi Kamizuma, Ryouhei Miyagawa, Tomonori Ichikawa