公开(公告)号：US20180262101A1

公开(公告)日：2018-09-13

申请号：US15973561

申请日：2018-05-08

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuki ISHIKURA ,  Koichi UEKI

IPC: H02M1/38 ,  H02M3/335 ,  H02M1/08

Abstract: A power conversion device includes a power conversion circuit that performs switching control of first and second semiconductor switches connected in series and converts an input direct current voltage into an alternating current voltage. A switching adjustment circuit includes a first capacitance addition circuit that increases an output capacitance of the first semiconductor switch. The first capacitance addition circuit includes a first capacitive element and a first switching unit connected in series and is connected in parallel to the first semiconductor switch. A first driving control circuit drives and controls the first capacitance addition circuit. The first driving control circuit turns on the first switching unit when the first semiconductor switch is turned off, increasing the output capacitance of the first semiconductor switch, and turns off the first switching unit when a predetermined time period elapses after the first semiconductor switch is turned off.