公开(公告)号：US20210194235A1

公开(公告)日：2021-06-24

申请号：US16757846

申请日：2018-09-21

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Tatsuo KOGA ,  Atsushi OKITA ,  Mitsuru KAJI

IPC: H02H1/00 ,  G01R31/333 ,  G01R31/12 ,  G01R31/58 ,  G01R31/16 ,  H02S40/30 ,  H02S50/00

Abstract: An arc detection circuit includes a current detector and arc determination unit. The current detector detects a current flowing through a transmission line which connects an electric power supply device and an electric power conversion circuit. The arc determination unit calculates, from a result of measurement of the current, an area of interest and an area for comparison. The area of interest is an area of a region of interest defined by a predetermined frequency range and predetermined time for determination. The area for comparison is an area of a portion in which detected strength exceeds a predetermined strength threshold in the region of interest. The arc determination unit determines an electric arc has occurred when a ratio between the area of interest and the area for comparison exceeds a predetermined area-ratio threshold.