公开(公告)号：US11329471B2

公开(公告)日：2022-05-10

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.

公开(公告)号：US10985693B2

公开(公告)日：2021-04-20

申请号：US16478799

申请日：2017-12-07

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Atsushi Okita ,  Tatsuo Koga

IPC: H02S50/00 ,  G01R31/12

Abstract: In an arc detector, a frequency analyzer analyzes frequency components of a current subject to detection in a first frequency band. A detector detects an occurrence of an arc by referring to the frequency components in the first frequency band. When the detector does not detect the occurrence of an arc by referring to the frequency components in the first frequency band, the frequency analyzer analyzes frequency components of the current subject to detection in a second frequency band lower than the first frequency band, and the detector detects the occurrence of an arc by referring to the frequency components in the second frequency band.