公开(公告)号：US20200220482A1

公开(公告)日：2020-07-09

申请号：US16717922

申请日：2019-12-17

Applicant: FANUC CORPORATION

Inventor： Yoshikiyo TANABE ,  Katsuhiro WATANABE

IPC: H02M7/797 ,  H02M7/06 ,  H02M7/539

Abstract: A power supply includes: a rectifier circuit which has a plurality of rectifier switching elements, and separately extracts a positive voltage and a negative voltage for every phase from a primary power source of three-phase alternating current, respectively; a smoothing circuit which has a pair of smoothing capacitors connected in series to each other to be charged by the rectifier circuit, and a plurality of smoothing inductors respectively arranged between the rectifier circuit and the smoothing capacitors; a inverter circuit which has a plurality of inverter switching elements and inverts output of the smoothing circuit into alternating current; and a control circuit which controls switching of the plurality of rectifier switching elements so that output voltage of the smoothing circuit becomes a desired voltage, and electrical current flowing to each phase of the rectifier circuit becomes a desired electrical current.