公开(公告)号：US20220250481A1

公开(公告)日：2022-08-11

申请号：US17618799

申请日：2020-05-13

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： TAKASHI HIROBE ,  TATSUYA OKAMOTO ,  SHUN KAZAMA

IPC: B60L3/04 ,  H02H7/18 ,  H02H3/093 ,  H02H3/087

Abstract: A power cutoff device includes a relay unit including a switch having a connecting state to be electrically conductive and a cutoff state to be electrically non-conductive, a cutoff unit connected in series to the switch, a current detector configured to detect an object current flowing through the cutoff unit, and a controller configured to control the relay unit and the cutoff unit. The cutoff unit has a connecting state to be electrically conductive and an irreversible cutoff state to be electrically conductive. The controller is configured to obtain a changing rate of the object current with respect to time. The controller is configured to cause the switch to be in the connecting state and cause the cutoff unit to be in the connecting state if determining that the changing rate is not greater than a changing-rate threshold. The controller is configured to cause the relay unit to be in the cutoff state and cause the cutoff unit to be in the irreversible cutoff state if determining that the changing rate is greater than the changing-rate threshold. This power cutoff device has a small size.