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公开(公告)号：US20140049198A1
公开(公告)日：2014-02-20
申请号：US13963382
申请日：2013-08-09
Applicant: Hitachi, Ltd.
Inventor： Kazuto OOYAMA , Toshisada MITSUI , Shingo NISHIGUCHI , Kimihisa FURUKAWA
IPC: H02P6/00
CPC classification number: H02P6/28 , H02M1/12 , H02M7/53873 , H03K7/08
Abstract: A power conversion device includes a power switching circuit that supplies AC voltages generated between switching elements operating as upper arms and switching elements operating as lower arms, and a control circuit that generates and supplies to the driver circuit signals for controlling the switching operation of the switching elements by a PWM method in a first operational region in which frequency of an AC power to be outputted is low, and that generates and supplies to the driver circuit signals for controlling the switching operation of the switching elements at timings based upon the phase of the AC power to be outputted in an operational region in which the frequency of the AC power to be outputted is higher than in the first operational region.
Abstract translation: 电力转换装置包括：电源切换电路，其提供在作为上臂工作的开关元件和作为下臂工作的开关元件之间产生的交流电压;以及控制电路，其产生并提供给驱动电路用于控制开关切换操作的信号 通过PWM方式在要输出的交流电力的频率为低的第一工作区域中产生并提供给驱动电路的信号的信号，所述信号用于在基于时钟的相位的时刻控制开关元件的开关操作 在要输出的交流电力的频率高于第一操作区域的操作区域中输出的交流电力。
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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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公开(公告)号：US20240275177A1
公开(公告)日：2024-08-15
申请号：US18682017
申请日：2022-08-09
Applicant: Hitachi, Ltd.
Inventor： Yuuichi MABUCHI , Kimihisa FURUKAWA
Abstract: This power converter device is appropriately configured. Accordingly, a power converter device comprises, for each phase of a three-phase AC, an AC wiring through which AC terminals of a plurality of power conversion units are series-connected along a second direction. Among the power conversion units, power conversion units that correspond to a first phase are series-connected from a first phase line toward a neutral line in a first direction along the second direction. Among the power conversion units, power conversion units that correspond to a second phase adjacent to the first phase are series-connected from a second phase line toward the neutral line in a second direction opposite to the first direction.
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4.发明申请公开(公告)号：US20190146026A1
公开(公告)日：2019-05-16
申请号：US16098599
申请日：2016-05-09
Applicant: Hitachi, Ltd.
Inventor： Yoshinobu KIMURA , Junichi SAKANO , Kimihisa FURUKAWA , Takashi OGAWA , Renichi YAMADA
Abstract: A diagnostic system for a power conversion apparatus including a semiconductor device and performing a switching operation for carrying and interrupting a main current to a main current is disclosed. This system includes a trigger circuit that acquires reference time for the switching operation; and a delay time calculation circuit that acquires first time at which the main current takes a first main current set value and second time at which the main current takes a second main current set value, and that detects numerical data about a difference between the first time and the reference time and numerical data about a difference between the second time and the reference time.
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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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Patent Agency Ranking
公开(公告)号：US20240283371A1
公开(公告)日：2024-08-22
申请号：US18681166
申请日：2022-07-22
Applicant: HITACHI, LTD.
Inventor： Yuuichi MABUCHI , Akihiko KANOUDA , Kimihisa FURUKAWA
Abstract: Provided is a power converter device that can be properly configured. The power converter device is provided with: a plurality of power conversion units each comprising a pair of AC terminals, a pair of DC terminals, and a power conversion circuit for performing power conversion in one direction or in both directions between the AC terminals and the DC terminals and arranged along a first direction and a second direction different from the first direction; AC wiring for connecting the AC terminals of the plurality of power conversion units in series along the second direction with respect to each phase of three-phase AC; and DC wiring for connecting the DC terminals of the plurality of power conversion units in parallel along the first direction.
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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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公开(公告)号：US20210143744A1
公开(公告)日：2021-05-13
申请号：US16617875
申请日：2017-06-14
Applicant: Hitachi, Ltd.
Inventor： Kimihisa FURUKAWA , Yuuichi MABUCHI , Yuki KAWAGUCHI , Akihiko KANOUDA
IPC: H02M5/458
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.
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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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公开(公告)号：US20240055173A1
公开(公告)日：2024-02-15
申请号：US18268820
申请日：2021-09-27
Applicant: Hitachi, Ltd.
Inventor： Kimihisa FURUKAWA , Akihiko KANOUDA , Yuuichi MABUCHI , Mizuki NAKAHARA , Hideaki TANAKA
IPC: H01F27/28
Abstract: The present invention provides a transformer having a high degree of design freedom for adjusting leakage inductance, while conforming to arrangement constraints between components in order to ensure the insulating properties of the transformer. This transformer has a core formed of a magnetic body, a primary coil wound around the core and being connected to a high-voltage side, the primary coil having two coil layers of an inner primary coil and an outer primary coil arranged more toward an outer peripheral side than the inner primary coil, and a second primary coil wound around the core and connected to a low-voltage side, the outer primary coil being arranged offset with respect to the inner primary coil in the longitudinal direction of the axis of the core.
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