公开(公告)号：US09800177B2

公开(公告)日：2017-10-24

申请号：US15047232

申请日：2016-02-18

Applicant: Sumitomo Electric Industries, Ltd.

Inventor： Naoki Ayai ,  Takashi Fumino ,  Yoshiharu Nakajima

IPC: H02M3/04 ,  H02M3/158 ,  H02M1/00 ,  H02M1/14 ,  H02M7/5387 ,  H02M7/797

CPC classification number: H02M7/5387 ,  H02M1/14 ,  H02M3/04 ,  H02M3/1582 ,  H02M7/797 ,  H02M2001/007

Abstract: 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.

公开(公告)号：US20180287390A1

公开(公告)日：2018-10-04

申请号：US15765921

申请日：2016-10-20

Applicant: Sumitomo Electric Industries, Ltd.

Inventor： Yoshiharu Nakajima ,  Naoki Ayai ,  Yusuke Shimizu

IPC: H02J3/38 ,  H02J7/35 ,  H02M3/158 ,  H02M7/5387 ,  H02J7/00

Abstract: This power conversion system is composed of a DC power supply circuit and a power conditioner which are connected to each other. The power conditioner includes: a first DC/DC converter provided between the DC power supply circuit and a DC bus; and an inverter provided between the DC bus and an AC electric path and configured to perform switching operation in such a manner that the inverter and the first DC/DC converter alternately have stop periods in an AC half cycle. The DC power supply circuit includes: a storage battery; and a second DC/DC converter of a bidirectional type, provided between the storage battery and the first DC/DC converter and including a DC reactor. The power conversion system includes a control unit configured to control current flowing through the DC reactor of the second DC/DC converter to have a constant value.

公开(公告)号：US11139657B2

公开(公告)日：2021-10-05

申请号：US15765921

申请日：2016-10-20

Applicant: Sumitomo Electric Industries, Ltd.

Inventor： Yoshiharu Nakajima ,  Naoki Ayai ,  Yusuke Shimizu

IPC: H02J7/35 ,  H02J3/38 ,  H02M7/48 ,  H02M3/156 ,  H02J3/32 ,  H02J7/00 ,  H02M3/158 ,  H02M7/5387 ,  H02M1/00

Abstract: This power conversion system is composed of a DC power supply circuit and a power conditioner which are connected to each other. The power conditioner includes: a first DC/DC converter provided between the DC power supply circuit and a DC bus; and an inverter provided between the DC bus and an AC electric path and configured to perform switching operation in such a manner that the inverter and the first DC/DC converter alternately have stop periods in an AC half cycle. The DC power supply circuit includes: a storage battery; and a second DC/DC converter of a bidirectional type, provided between the storage battery and the first DC/DC converter and including a DC reactor. The power conversion system includes a control unit configured to control current flowing through the DC reactor of the second DC/DC converter to have a constant value.