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11. 发明授权

US10355620B2 Conversion device 有权
公开(公告)号：US10355620B2
公开(公告)日：2019-07-16
申请号：US15519417
申请日：2014-12-19
申请人： Sumitomo Electric Industries, Ltd.
发明人： Naoki Ayai , Toshiaki Okumura , Tetsuo Akita , Kenji Abiru
IPC分类号： H02J7/00 , H03H7/01 , H02M1/12 , H02M7/539 , H02M3/155 , H02M7/48 , H02S40/32 , H02M3/156 , H02M1/00 , H02J7/35
摘要： This conversion device converts DC powers from a plurality of DC power supplies, to AC power and supplies the AC power to a load. The conversion device includes: a filter circuit including an AC reactor and a first capacitor; a DC/AC inverter connected to the load via the filter circuit; DC/DC converters provided between the respective plurality of DC power supplies and the DC/AC inverter; a second capacitor provided between the DC/AC inverter and the DC/DC converters; and a control unit configured to set a current target value for each of the DC/DC converters to thereby be synchronized with current of the AC power, based on voltage of the AC power, voltage variation due to current flowing through the AC reactor and an impedance thereof, reactive currents respectively flowing through the first capacitor and the second capacitor, and voltage of each DC power.

12. 发明授权

US10355519B2 Power supply unit and method for backfeed protection thereof 有权
公开(公告)号：US10355519B2
公开(公告)日：2019-07-16
申请号：US15743102
申请日：2016-06-23
申请人： Sumitomo Electric Industries, Ltd.
发明人： Tetsuo Akita , Koichi Takeshita , Naoki Ayai , Tomohiro Yamaguchi
IPC分类号： H02J9/06 , G01R19/165 , H02M7/797 , H02J7/02
摘要： This power supply unit includes: an AC path from an input end to an output end; a first voltage sensor configured to detect an input voltage at the input end; a second voltage sensor configured to detect an output voltage at the output end; a bidirectional inverter connected to the AC path; a storage battery connected to the AC path via the bidirectional inverter; an AC switch provided between the input end and a point at which the bidirectional inverter is connected to the AC path; and a control unit configured such that, in a state in which the AC switch is controlled to be opened, if current conduction via the AC switch is detected on the basis of an operation state of the bidirectional inverter, the input voltage, and the output voltage, the control unit determines that the AC switch has failed, and stops the bidirectional inverter.

13. 发明申请

US20190081505A1 POWER SUPPLY UNIT AND METHOD FOR BACKFEED PROTECTION THEREOF 审中-公开
公开(公告)号：US20190081505A1
公开(公告)日：2019-03-14
申请号：US15743102
申请日：2016-06-23
申请人： Sumitomo Electric Industries, Ltd.
发明人： Tetsuo Akita , Koichi Takeshita , Naoki Ayai , Tomohiro Yamaguchi
IPC分类号： H02J9/06 , H02M7/797 , G01R19/165
CPC分类号： H02J9/06 , G01R19/16547 , H02J7/022 , H02M7/797
摘要： This power supply unit includes: an AC path from an input end to an output end; a first voltage sensor configured to detect an input voltage at the input end; a second voltage sensor configured to detect an output voltage at the output end; a bidirectional inverter connected to the AC path; a storage battery connected to the AC path via the bidirectional inverter; an AC switch provided between the input end and a point at which the bidirectional inverter is connected to the AC path; and a control unit configured such that, in a state in which the AC switch is controlled to be opened, if current conduction via the AC switch is detected on the basis of an operation state of the bidirectional inverter, the input voltage, and the output voltage, the control unit determines that the AC switch has failed, and stops the bidirectional inverter.

14. 发明申请

US20170133921A1 POWER CONVERSION DEVICE AND THREE-PHASE AC POWER SUPPLY DEVICE 审中-公开
公开(公告)号：US20170133921A1
公开(公告)日：2017-05-11
申请号：US15319715
申请日：2015-03-10
申请人： Sumitomo Electric Industries, Ltd.
发明人： Toshiaki Okumura , Naoki Ayai
IPC分类号： H02M1/12 , H02M7/537
CPC分类号： H02M1/126 , G05F1/67 , H02J3/383 , H02M1/12 , H02M3/158 , H02M7/49 , H02M7/537 , H02M2001/007 , Y02E10/563
摘要： This power conversion device includes: conversion devices for supplying AC powers to respective phases with respect to the neutral point of a three-phase AC system via reactors; and a control unit for controlling the conversion devices. Each conversion device includes: a step-up circuit for stepping up the DC input voltage value of DC power; and a single-phase inverter circuit. For each conversion device, when the absolute value of a voltage target value obtained, as an AC waveform to be outputted, by superimposing a third-order harmonic on a fundamental wave exceeds the inputted DC voltage, the control unit causes the step-up circuit to perform step-up operation to generate the absolute value of the voltage target value and causes the single-phase inverter circuit to only perform necessary polarity inversion, and when the absolute value of the voltage target value is smaller than the inputted DC voltage, the control unit stops the step-up operation of the step-up circuit and causes the single-phase inverter circuit to operate to generate the voltage target value.

15. 发明申请

US20160329829A1 POWER CONVERSION DEVICE AND THREE-PHASE ALTERNATING CURRENT POWER SUPPLY DEVICE 有权
标题翻译：电力转换装置和三相交流电源装置
公开(公告)号：US20160329829A1
公开(公告)日：2016-11-10
申请号：US15109080
申请日：2015-01-06
申请人： SUMITOMO ELECTRIC INDUSTRIES LTD.
发明人： Naoki Ayai , Koichi Takeshita
IPC分类号： H02M7/44 , H02M1/12 , H02M1/08 , H02M3/158
CPC分类号： H02M7/44 , G05F1/10 , H02J3/383 , H02M1/08 , H02M1/126 , H02M3/158 , H02M7/5387 , H02M7/53871 , H02M2001/0009 , H02M2001/007 , Y02E10/563
摘要： Provided is a power conversion device that converts power between DC units and three-phase AC. A first-phase conversion device, a second-phase conversion device, and a third-phase conversion device each include a DC/DC conversion circuit and a single-phase power conversion circuit. For each of the first-phase conversion device, the second-phase conversion device, and the third-phase conversion device, when an absolute value of a voltage target value for the AC exceeds DC voltage of each DC unit, a control unit causes the DC/DC conversion circuit to operate to achieve the absolute value of the voltage target value and causes the single-phase power conversion circuit to only perform necessary polarity inversion, and when the absolute value of the voltage target value is smaller than the DC voltage, the control unit stops operation of the DC/DC conversion circuit and causes the single-phase power conversion circuit to operate to achieve the voltage target value.
摘要翻译：提供了在直流单元和三相AC之间转换功率的功率转换装置。第一相转换装置，第二相转换装置和第三相转换装置各自包括DC / DC转换电路和单相电力转换电路。对于第一相变换装置，第二相转换装置和第三相变换装置，当AC的电压目标值的绝对值超过每个DC单元的直流电压时，控制装置使得 DC / DC转换电路，以实现电压目标值的绝对值，并使单相功率转换电路仅执行必要的极性反转，并且当电压目标值的绝对值小于DC电压时，控制单元停止DC / DC转换电路的动作，使单相电力变换电路动作，达到电压目标值。

16. 发明授权

US11031807B2 Power supply device and power supply system 有权
公开(公告)号：US11031807B2
公开(公告)日：2021-06-08
申请号：US16313698
申请日：2017-06-07
申请人： Sumitomo Electric Industries, Ltd.
发明人： Tetsuo Akita , Naoki Ayai
IPC分类号： H04Q9/08 , H02J3/14 , H02J9/06 , H02J3/38 , H02J7/35 , H01M10/48 , H01M10/42 , H01M10/44 , H02J7/02 , H02M7/68
摘要： This power supply device includes: a power interconnection path connecting a power interconnection port to a power conversion unit via a first switch; a stand-alone power supply path leading from an auxiliary input port via a second switch to an output port to which a load is connected; a storage-battery-side power supply path leading from a storage battery via the power conversion unit to the output port; and a control unit, the control unit causing the power conversion unit to charge/discharge the storage battery when interconnected with a commercial power grid, the control unit supplying power to the load via one of the stand-alone power supply path and the storage-battery-side power supply path when disconnected from the commercial power grid, the control unit switching the power supply path from the one to the other within an extremely short time period such as not to influence the load.

17. 发明授权

US10530238B2 Power conversion device and method for controlling same 有权
公开(公告)号：US10530238B2
公开(公告)日：2020-01-07
申请号：US15738297
申请日：2016-06-20
申请人： Sumitomo Electric Industries, Ltd.
发明人： Tetsuo Akita , Naoki Ayai
IPC分类号： H02J7/00 , H02M1/08 , H02M3/155 , H02M7/797 , H02M1/00
摘要： A power conversion device includes a switch connected to an AC system; an AC/DC converter; and a DC/DC converter. A control unit compares an absolute value of an AC voltage target value based on the AC voltage with a DC voltage target value based on the storage battery voltage, and executes, on the basis of a magnitude relation of the values, a control method such that a period during which step-up operation is performed through switching operation mainly using one of the AC/DC converter and the DC/DC converter, and a period during which step-down operation is performed through switching operation mainly using the other one of the converters, alternately arise. When starting charging/discharging of the storage battery, the control unit causes the switch to close at zero cross timing of the AC voltage, and thereafter, causes charging/discharging to start from the switching operation through which the step-down operation is performed.

18. 发明授权

US10340814B2 Gate-blocking a DC/DC converter based upon output current of an AC reactor in a power conversion device 有权
公开(公告)号：US10340814B2
公开(公告)日：2019-07-02
申请号：US16084419
申请日：2016-10-24
申请人： Sumitomo Electric Industries, Ltd.
发明人： Yusuke Shimizu , Tetsuo Akita , Naoki Ayai
IPC分类号： H02M7/48 , H02H3/08 , H02M1/32
摘要： Control is performed such that, for generating an AC voltage from a DC voltage, a period during which a DC/DC converter boosts the DC voltage and an inverter performs one of polarity non-inversion passing and polarity inversion passing, and a period during which the DC/DC converter is stopped and the inverter performs step-down operation and one of polarity non-inversion passing and polarity inversion passing, arise alternately in one AC cycle. Gate blocking is temporarily performed for only the DC/DC converter, upon occurrence of a phenomenon in which, by start of power feeding to a load connected to an AC electric path, an absolute value of a current flowing through an AC reactor reaches a predetermined converter gate block threshold value lower than an instantaneous overcurrent protection threshold value.

19. 发明申请

US20180287511A1 POWER CONVERSION DEVICE AND CONTROL METHOD THEREOF 审中-公开
公开(公告)号：US20180287511A1
公开(公告)日：2018-10-04
申请号：US15764507
申请日：2016-07-04
申请人： Sumitomo Electric Industries, Ltd.
发明人： Naoki Ayai
IPC分类号： H02M7/5387 , H02M3/158 , H02M1/14
CPC分类号： H02M7/53871 , H02J3/383 , H02M1/14 , H02M1/4225 , H02M3/158 , H02M7/48 , H02M2001/0054
摘要： This power conversion device performs DC/AC power conversion via an intermediate bus, and includes: a first DC/DC converter provided between a DC power supply and the intermediate bus; a second DC/DC converter provided between a DC-side capacitor and the intermediate bus; an intermediate capacitor connected to the intermediate bus; a DC/AC converter provided between the intermediate bus and an AC grid; and a control unit configured to control the first DC/DC converter, the second DC/DC converter, and the DC/AC converter, the control unit making such current command value setting that mainly the second DC/DC converter supplies a reactive current flowing through the intermediate bus.

20. 发明授权

US09800177B2 Conversion device 有权
公开(公告)号：US09800177B2
公开(公告)日：2017-10-24
申请号：US15047232
申请日：2016-02-18
申请人： Sumitomo Electric Industries, Ltd.
发明人： Naoki Ayai , Takashi Fumino , Yoshiharu Nakajima
IPC分类号： H02M3/04 , H02M3/158 , H02M1/00 , H02M1/14 , H02M7/5387 , H02M7/797
CPC分类号： H02M7/5387 , H02M1/14 , H02M3/04 , H02M3/1582 , H02M7/797 , H02M2001/007
摘要： A conversion device includes: a DC bus provided between a DC power supply and an AC power supply; a first converter provided between the DC power supply and the DC bus to perform DC/DC conversion; a second converter provided between the DC bus and the AC power supply to perform DC/AC or AC/DC conversion; and a control unit configured to selectively cause the first converter and the second converter to operate within one cycle of the AC power supply, to alternately generate a part of an absolute value of an AC waveform, and a DC waveform, as voltage of the DC bus, wherein the control unit adds a compensation value in a positive direction, to a voltage target value for the DC bus, at a timing that should have corresponded to a discontinuity point where the AC waveform and the DC waveform are connected to each other.

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