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公开(公告)号：US20250047195A1
公开(公告)日：2025-02-06
申请号：US18842831
申请日：2023-01-06
Applicant: HITACHI, LTD.
Inventor： Hiroshi KAMIZUMA , Takae SHIMADA , Kimihisa FURUKAWA , Yuki KAWAGUCHI , Yuuichi MABUCHI
Abstract: The power conversion unit diagnosis system has: a plurality of power conversion units that supply the DC power to at least one load and are connected in series with each other; a control unit that controls the plurality of power conversion units; and an output side switching unit that enables the output portions of at least some of the plurality of power conversion units to be connected in parallel with one load. When the output portions of at least some of the plurality of power conversion units are connected in parallel with the one load, the control unit determines the state of each of the plurality of power conversion units and diagnoses, on the basis of the state, whether the characteristics of each of the plurality of power conversion units are degraded or not.
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2.发明公开公开(公告)号：US20230361691A1
公开(公告)日：2023-11-09
申请号：US18026526
申请日：2021-08-03
Applicant: Hitachi, Ltd.
Inventor： Ryou MOTEKI , Hisashi MOROOKA , Shintarou TAKEDA , Makoto ABE , Hiroshi KAMIZUMA , Kinya NAKATSU
CPC classification number: H02M7/48 , H05K7/2089
Abstract: 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.
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公开(公告)号：US20160248338A1
公开(公告)日：2016-08-25
申请号：US15049611
申请日：2016-02-22
Applicant: Hitachi, Ltd.
Inventor： Shinji SHIRAKAWA , Hiroshi KAMIZUMA , Daisuke MATSUMOTO , Akira MIMA , Yukio HATTORI
IPC: H02M7/00 , H02M7/5387 , H02M5/458 , H05K7/14
CPC classification number: H02M7/003 , H01R13/02 , H02M5/458 , H05K7/1432
Abstract: 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.
Abstract translation: 转换电路的模块包括高侧IGBT，低侧IGBT串联连接到高侧IGBT，第一端子连接到高侧IGBT，第二端子连接到低压侧IGBT，电容器，连接到第一端子 端子和第二端子，以及连接到高侧IGBT和低侧IGBT之间的连接点的第三端子。 第四端子与第一端子接合。 第五端子与第二端子接合。 第六个终端与第三个终端接合。 第一和第二端子在前边缘和后边缘之间的部分具有比其它部分更高的电阻的高电阻部分。
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公开(公告)号：US20140286064A1
公开(公告)日：2014-09-25
申请号：US14198014
申请日：2014-03-05
Applicant: Hitachi, Ltd.
Inventor： Hiroshi KAMIZUMA , Kinya NAKATSU , Junpei KUSUKAWA , Takeshi TOKUYAMA
Abstract: A capacitor device includes: a film capacitor element that comprises 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 comprises 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.
Abstract translation: 电容器装置包括：薄膜电容器元件，其包括层叠并缠绕在一起的绝缘层和带电层的线圈体，以及形成在所述线圈体的两个相对端面上的一对集电极; 包括其中接收所述薄膜电容器元件的电容器容纳部分的情况; 一对具有绝缘性能的插入件，其一个插入在一对集电电极之一和电容器容纳部分的一个内壁之间; 以及填充在所述薄膜电容器元件与所述电容器容纳部的所述内壁的一个之间的密封绝缘材料的质量。
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公开(公告)号：US20240266969A1
公开(公告)日：2024-08-08
申请号：US18565578
申请日：2022-06-06
Applicant: Hitachi, Ltd.
Inventor： Hiroshi KAMIZUMA , Akihiko KANOUDA , Yuuichi MABUCHI , Kimihisa FURUKAWA
CPC classification number: H02M7/219 , H02M1/0009 , H02M1/007 , H02M1/0074 , H02M7/23
Abstract: A plurality of power conversion units, a current sensor that detects a current at an output terminal of the power conversion unit, and a control unit that measures a frequency component in a predetermined frequency range of a current detected by the current sensor are included, the power conversion unit includes an AC/DC converter that outputs AC power at an input terminal to an output terminal, a smoothing capacitor that is connected in parallel to the output terminal and smooths an output voltage, and a variable resistance switch connected between one end of the smoothing capacitor and one end of the output terminal, the control unit controls a resistance value of the variable resistance switch according to a magnitude of a predetermined frequency component detected by the current sensor, and the output terminals of the plurality of power conversion units are connected in parallel to constitute output terminals.
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Patent Agency Ranking
公开(公告)号：US20240258930A1
公开(公告)日：2024-08-01
申请号：US18399814
申请日：2023-12-29
Applicant: HITACHI, LTD.
Inventor： Hangxian GAO , Hiroshi KAMIZUMA
Abstract: A power conversion system incorporated in a flight vehicle includes a power converter having a semiconductor element stored therein. An energy storage is disposed above the power converter in the vertical direction, the energy storage storing a solid or liquid energy source containing a neutron attenuating material. The power converter is provided with a movable mechanism that moves to shift in position according to a tilt of the flight vehicle. The movable mechanism includes slider rails and a slider movable unit.
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公开(公告)号：US20240030824A1
公开(公告)日：2024-01-25
申请号：US18221949
申请日：2023-07-14
Applicant: Hitachi, Ltd.
Inventor： Kimihisa FURUKAWA , Yuuichi MABUCHI , Takae SHIMADA , Mohammed Mosaddique Nawaz HUSSAIN , Hiroshi KAMIZUMA , Yuki KAWAGUCHI , Abhijit CHOUDHURY , Akihiko KANOUDA
CPC classification number: H02M3/33569 , H01F27/36 , H01F2027/348
Abstract: 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.
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公开(公告)号：US20180006573A1
公开(公告)日：2018-01-04
申请号：US15548477
申请日：2015-03-04
Applicant: Hitachi, Ltd.
Inventor： Yukio HATTORI , Hiroshi KAMIZUMA , Daisuke MATSUMOTO , Akira MIMA , Ryouhei MIYAGAWA
CPC classification number: H02M7/217 , H02M7/003 , H02M7/219 , H02M7/5387 , H05K7/209 , H05K7/20909 , H05K7/20936
Abstract: 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.
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公开(公告)号：US20250149909A1
公开(公告)日：2025-05-08
申请号：US18837465
申请日：2023-01-18
Applicant: HITACHI, LTD.
Inventor： Takae SHIMADA , Kimihisa FURUKAWA , Yuuichi MABUCHI , Hiroshi KAMIZUMA , Yuki KAWAGUCHI
Abstract: Provided is a charging system that can appropriately assign a power conversion unit to an apparatus to be charged. For this purpose, a unit assignment section is configured to, when a new apparatus to be charged is connected to any of charging ports, reduce the number of assigned units preferentially for one, from among apparatuses to be charged for which the number of assigned units is plural, that involves a smaller reduction in charging power when the number of assigned units is reduced, and to assign the power conversion section in a vacant state resulting from the reduction to the newly connected device to be charged.
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公开(公告)号：US20230056704A1
公开(公告)日：2023-02-23
申请号：US17796847
申请日：2021-02-25
Applicant: Hitachi, Ltd.
Inventor： Hajime URAI , Hiroshi KAMIZUMA , Kimihisa FURUKAWA , Noriya NAKAO , Kinya NAKATSU
Abstract: 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.
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