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公开(公告)号：US10277036B2
公开(公告)日：2019-04-30
申请号：US14891292
申请日：2014-05-22
Applicant: Sumitomo Electric Industries, Ltd.
Inventor： Naoki Ayai , Kenji Abiru , Toshiaki Okumura
Abstract: An inverter device includes a circuit configuration for converting, to AC power, DC powers respectively given from a first power supply and a second power supply which outputs power with voltage lower than that of the first power supply. The inverter device includes: a first step-up circuit; a second step-up circuit; an inverter circuit connected to both step-up circuits connected in parallel to each other, the inverter circuit configured to convert powers given from both step-up circuits to AC power; and a control unit configured to multiply a power value including the AC power outputted from the inverter circuit, by a ratio of a power value of the DC power of each step-up circuit to a total power value obtained by summing the DC powers of both step-up circuits, and set a current target value for each step-up circuit based on a value obtained by the multiplication.
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公开(公告)号：US20160268890A1
公开(公告)日：2016-09-15
申请号：US15032197
申请日：2014-12-19
Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
Inventor： Naoki Ayai , Tetsuo Akita , Toshiaki Okumura , Kenji Abiru
CPC classification number: H02M7/44 , H02M1/08 , H02M1/42 , H02M3/04 , H02M3/156 , H02M7/48 , H02M2001/0009 , H02M2001/007
Abstract: Provided is a conversion device that converts DC power provided from a DC power supply, to AC power and supplies the AC power to a load, the conversion device including: a filter circuit connected to the load and including an AC reactor and a first capacitor; a DC/AC inverter connected to the load via the filter circuit; a DC/DC converter provided between the DC power supply and the DC/AC inverter; a second capacitor provided between the DC/AC inverter and the DC/DC converter; and a control unit configured to set a current target value for the DC/DC converter 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 the DC power.
Abstract translation: 提供一种转换装置，其将从直流电源提供的直流电力转换为交流电，并将交流电力提供给负载，转换装置包括：连接到负载并包括交流电抗器和第一电容器的滤波器电路; 通过滤波电路连接到负载的DC / AC逆变器; DC / DC转换器，设置在DC电源和DC / AC逆变器之间; 设置在DC / AC逆变器和DC / DC转换器之间的第二电容器; 以及控制单元，其被配置为基于AC电力的电压，由于流过AC电抗器的电流引起的电压变化及其阻抗，将DC / DC转换器的电流目标值设定为与AC电力的电流同步 ，分别流过第一电容器和第二电容器的无功电流以及直流电力的电压。
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公开(公告)号：US10348190B2
公开(公告)日：2019-07-09
申请号：US15574916
申请日：2016-04-04
Applicant: Sumitomo Electric Industries, Ltd.
Inventor： Yusuke Shimizu , Tetsuo Akita , Toshiaki Okumura , Naoki Ayai
IPC: H02M1/44 , H02M3/158 , H02M7/5387 , H02M1/14 , H02M3/156 , H02M7/797 , H02M7/48 , H02M1/00 , H02J3/38
Abstract: Duties of control for DC/AC and DC/DC conversion units are determined by considering electric influences of a filter circuit, a capacitor connected to a DC bus, and a DC reactor for an output voltage command value for supplying an AC voltage to a load. The DC/DC conversion unit is controlled to convert a DC voltage into a DC bus voltage waveform alternately having a period of a pulsating current waveform corresponding to the absolute value of the AC voltage and a period of the DC voltage as a pulsating current minimum value. The DC/AC conversion unit is controlled to perform step-down operation during the period of the DC voltage and thus perform conversion into a waveform of the absolute value of the AC voltage corresponding to the period of the DC voltage, and also to perform polarity inversion per one pulsating current cycle.
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公开(公告)号：US10193434B2
公开(公告)日：2019-01-29
申请号：US15319715
申请日：2015-03-10
Applicant: Sumitomo Electric Industries, Ltd.
Inventor： Toshiaki Okumura , Naoki Ayai
Abstract: 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.
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公开(公告)号：US09831676B2
公开(公告)日：2017-11-28
申请号：US15312151
申请日：2015-03-11
Applicant: Sumitomo Electric Industries, Ltd.
Inventor： Toshiaki Okumura , Naoki Ayai
CPC classification number: H02J3/38 , H02J3/46 , H02M3/28 , H02M7/4807 , H02M7/487 , H02M7/53875 , H02M7/5395 , H02M2001/0048 , Y02B70/1491
Abstract: A power conversion device includes: a conversion device for each phase which converts DC voltage inputted from a DC power supply, to voltage having an AC waveform to be outputted to each phase with respect to a neutral point of three-phase AC; and a control unit which controls these conversion devices. Each conversion device includes: a first conversion unit which has a DC/DC converter including an isolation transformer, and a capacitor, and which converts the inputted DC voltage to voltage containing a pulsating-current waveform corresponding to the absolute value of voltage obtained by superimposing a third-order harmonic on a fundamental wave as the AC waveform to be outputted; and a second conversion unit which has a full-bridge inverter for inverting the polarity of the voltage containing the pulsating-current waveform, per one cycle, thereby converting the voltage to voltage having the AC waveform.
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Patent Agency Ranking
公开(公告)号：US20170229978A1
公开(公告)日：2017-08-10
申请号：US15519417
申请日：2014-12-19
Applicant: Sumitomo Electric Industries, Ltd.
Inventor： Naoki Ayai , Toshiaki Okumura , Tetsuo Akita , Kenji Abiru
CPC classification number: H02M7/539 , H02J7/0063 , H02J7/35 , H02M1/12 , H02M1/126 , H02M3/155 , H02M3/156 , H02M7/48 , H02M2001/0048 , H02M2001/009 , H02S40/32 , H03H7/0115 , Y02B70/1491
Abstract: 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.
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公开(公告)号：US20170104422A1
公开(公告)日：2017-04-13
申请号：US15312151
申请日：2015-03-11
Applicant: Sumitomo Electric Industries, Ltd.
Inventor： Toshiaki Okumura , Naoki Ayai
IPC: H02M7/487
CPC classification number: H02J3/38 , H02J3/46 , H02M3/28 , H02M7/4807 , H02M7/487 , H02M7/53875 , H02M7/5395 , H02M2001/0048 , Y02B70/1491
Abstract: A power conversion device includes: a conversion device for each phase which converts DC voltage inputted from a DC power supply, to voltage having an AC waveform to be outputted to each phase with respect to a neutral point of three-phase AC; and a control unit which controls these conversion devices. Each conversion device includes: a first conversion unit which has a DC/DC converter including an isolation transformer, and a capacitor, and which converts the inputted DC voltage to voltage containing a pulsating-current waveform corresponding to the absolute value of voltage obtained by superimposing a third-order harmonic on a fundamental wave as the AC waveform to be outputted; and a second conversion unit which has a full-bridge inverter for inverting the polarity of the voltage containing the pulsating-current waveform, per one cycle, thereby converting the voltage to voltage having the AC waveform.
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公开(公告)号：US10476259B2
公开(公告)日：2019-11-12
申请号：US16308106
申请日：2017-03-06
Applicant: Sumitomo Electric Industries, Ltd.
Inventor： Toshiaki Okumura , Naoki Ayai , Koichi Takeshita , Fumio Urakawa , Shinjirou Shinada , Tadatsugu Udono
Abstract: A power conversion device provided between a DC power supply and an AC electric path, including: a breaking device provided to at least one line of an output electric path in the power conversion device; a first voltage sensor provided on a primary side of the breaking device; a second voltage sensor provided on a secondary side of the breaking device; and a determination unit which calculates a primary-side voltage and a secondary-side voltage, and a primary-side phase and a secondary-side phase and determines that the breaking device is opened, by occurrence of an event in which an absolute value of a voltage difference between the primary-side voltage and the secondary-side voltage is greater than a voltage difference threshold value and an absolute value of a phase difference between the primary-side phase and the secondary-side phase is greater than a phase difference threshold value.
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公开(公告)号：US10355620B2
公开(公告)日：2019-07-16
申请号：US15519417
申请日：2014-12-19
Applicant: Sumitomo Electric Industries, Ltd.
Inventor： Naoki Ayai , Toshiaki Okumura , Tetsuo Akita , Kenji Abiru
IPC: H02J7/00 , H03H7/01 , H02M1/12 , H02M7/539 , H02M3/155 , H02M7/48 , H02S40/32 , H02M3/156 , H02M1/00 , H02J7/35
Abstract: 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.
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公开(公告)号：US20170133921A1
公开(公告)日：2017-05-11
申请号：US15319715
申请日：2015-03-10
Applicant: Sumitomo Electric Industries, Ltd.
Inventor： Toshiaki Okumura , Naoki Ayai
CPC classification number: H02M1/126 , G05F1/67 , H02J3/383 , H02M1/12 , H02M3/158 , H02M7/49 , H02M7/537 , H02M2001/007 , Y02E10/563
Abstract: 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.
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