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公开(公告)号：US20160254758A1
公开(公告)日：2016-09-01
申请号：US15052274
申请日：2016-02-24
Applicant: Hitachi, Ltd.
Inventor： Yasuaki NORIMATSU , Akihiko KANOUDA , Yuuichi MABUCHI , Tadahiko CHIDA , Takuya ISHIGAKI , Takae SHIMADA
CPC classification number: H02M5/458 , H02M1/32 , H02M3/335 , H02M7/4807 , H02M7/487 , Y02B70/1433
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.
Abstract translation: 如果DC / DC转换器的输入电压低于预先设定的第一电压值，则转换器控制器将DC / DC转换器的输出电压维持在通过改变操作而提前设定的第一电压范围内 作为第一电压保持控制，DC / DC转换器的转换频率符合输入电压。 如果所述输入电压高于高于所述第一电压值的第二电压值，则所述转换器控制器通过根据所述输入来改变所述操作频率来将所述输出电压维持在高于所述第一电压范围的第二电压范围内 电压作为第二电压保持控制。
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公开(公告)号：US20150092452A1
公开(公告)日：2015-04-02
申请号：US14563693
申请日：2014-12-08
Applicant: Hitachi, Ltd.
Inventor： Tomoyuki HATAKEYAMA , Takae SHIMADA
IPC: H02M3/335
CPC classification number: H02M3/33507 , H02M3/24 , H02M3/33538 , H02M3/3376 , H02M2001/0032 , Y02B70/16
Abstract: Provided is a vehicle which enables a highly-efficient DC-DC converter and a highly-efficient power supply to a load, regardless of a power supply amount of to the load. When the power supply amount to a load R1 is a predetermined value or more, a control means 5 implements a first mode for making the switching elements S1 to S4 driven, and when the power supply amount of to the load R1 is the predetermined value or less, the control means 5 implements a second mode, for making the switching elements S3 and S4 stopped in an OFF state, and making only the switching elements S1 and S2 driven.
Abstract translation: 无论负载的供电量如何，都能够实现高效率的DC-DC转换器和对负载的高效电源。 当负载R1的电源量为预定值以上时，控制装置5实施用于使开关元件S1〜S4驱动的第一模式，并且当负载R1的供电量为预定值时，或 较少，控制装置5实现第二模式，用于使开关元件S3和S4停止在断开状态，并且仅使开关元件S1和S2被驱动。
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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：US20200091831A1
公开(公告)日：2020-03-19
申请号：US16616021
申请日：2018-04-24
Applicant: Hitachi, Ltd.
Inventor： Mitsuhiro KADOTA , Takae SHIMADA
IPC: H02M5/458 , H02M7/5387 , H02M7/219
Abstract: A power conversion device includes: power conversion cells; and a controller to control the cells. Each cell includes: a transformer; a primary conversion unit on a primary side of the transformer; a secondary conversion unit on a secondary side; a primary bypass device for short-circuiting between input terminals of the cell; and a secondary bypass device for short-circuiting between output terminals of the cell. The input terminals and/or the output terminals of the cells are connected in series. When the primary conversion unit(s) of a part of the cells is stopped, the controller turns on the primary bypass device and sets secondary DC link voltages to prescribed values; and when the secondary conversion unit(s) of a part of the cells is stopped, the controller turns on the secondary bypass device and controls the primary conversions units to set primary DC link voltages to prescribed values.
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公开(公告)号：US20190319548A1
公开(公告)日：2019-10-17
申请号：US16309335
申请日：2017-04-10
Applicant: Hitachi, Ltd.
Inventor： Mizuki NAKAHARA , Yasuaki NORIMATSU , Takae SHIMADA , Mitsuhiro KADOTA , Yuki KAWAGUCHI
Abstract: In a power conversion device in a configuration in which a plurality of power converter cells has serially connected outputs and includes a converter and an inverter as components, when a load is light, the cells also operate with a light load, and efficiency is reduced. A power conversion device has a plurality of power converter cells. The outputs of the cells are connected in series. The device has a controller that controls the cells. The cells each have a converter that converts an externally inputted power supply voltage and generates a DC link voltage and an inverter that converts the DC link voltage into an alternating current voltage and outputs the current. The controller stops a converter in some of the cells depending on power supply electric power or load electric power. The inverter continues to operate using a link capacitor as a power supply.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20160352229A1
公开(公告)日：2016-12-01
申请号：US15159018
申请日：2016-05-19
Applicant: Hitachi, Ltd.
Inventor： Yasuaki NORIMATSU , Akihiko KANOUDA , Yuuichi MABUCHI , Tadahiko CHIDA , Takuya ISHIGAKI , Takae SHIMADA
IPC: H02M3/335 , H02J3/38 , H02M7/5387
CPC classification number: H02M3/33507 , H02J3/385 , H02M3/335 , H02M7/4807 , H02M7/49 , H02M7/5387 , Y02B70/1433 , Y02E10/56
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.
Abstract translation: 要求减小变压器的尺寸和重量，并且可以通过将SST应用于变压器来实现。 然而，对于阳光的SST应用于PCS要求如下：处理太阳能发电电压的很大变化范围; 降低功率器件，DC / DC转换器和逆变器的开关损耗，在电源电路中实现高频SST应用; 增加电压到电网电压; 并且在升压之前减小高电流路径的尺寸。 因此，LLC谐振转换器配置应用于输出中的逆变器，并且串联配置被应用于逆变器。 LLC谐振转换器经受恒定的频率调节，输出大，升压控制低输出，降压控制根据阳光下的MPPT电压进行上限电压，以实现驱动损耗降低和电压范围处理 。
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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：US20240154542A1
公开(公告)日：2024-05-09
申请号：US18379388
申请日：2023-10-12
Applicant: Hitachi, Ltd.
Inventor： Abhijit CHOUDHURY , Takae SHIMADA
IPC: H02M7/5387 , H02J7/06 , H02M3/335
CPC classification number: H02M7/5387 , H02J7/06 , H02M3/33584 , H02J2207/20
Abstract: A power conversion device charges a plurality of storage devices and includes a plurality of converter units that receives AC power and outputs DC power, and a bidirectional DC/DC converter connected between two DC outputs of a plurality of DC outputs of the plurality of converter units. The bidirectional DC/DC converter transmits at least a part of output power of the converter unit at one DC output from the one DC output to the other DC output of the two DC outputs according to required power of the plurality of storage devices.
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公开(公告)号：US20170093299A1
公开(公告)日：2017-03-30
申请号：US15245240
申请日：2016-08-24
Applicant: Hitachi, Ltd.
Inventor： Yasuaki NORIMATSU , Akihiko KANODA , Yuichi MABUCHI , Takae SHIMADA , Mitsuhiro KADOTA , Yuki KAWAGUCHI , Akira YONEKAWA
IPC: H02M5/458
CPC classification number: H02M5/458 , H02J3/383 , H02M1/08 , H02M3/335 , H02M7/49 , H02M2001/0006 , Y02E10/563
Abstract: In order to reduce the size of an isolation transformer, the present invention provides a power conversion device including: a first inverter unit for obtaining a DC input and giving a high frequency output; an LLC transformer for converting the voltage of the high frequency output of the first inverter unit; a rectifier unit for DC-converting the voltage of the output of the LLC transformer; a second inverter unit for converting the DC output of the rectifier unit into AC; and a control circuit for obtaining the gate power of a semiconductor device configuring the second inverter unit through a power supply transformer for the control circuit that is connected in parallel to the secondary circuit of the LLC transformer.
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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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