公开(公告)号：US12194866B2

公开(公告)日：2025-01-14

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: B60L3/00 ,  B60L3/04 ,  H02H3/00 ,  H02H3/087 ,  H02H3/093 ,  H02H7/18

Abstract: A power cutoff device includes a relay unit including a switch having a connecting state and a cutoff state, a cutoff unit connected in series to the switch, a current detector to detect an object current flowing through the cutoff unit, and a controller to control the relay unit and the cutoff unit. The cutoff unit has a connecting state and an irreversible cutoff state. The controller obtains a changing rate of the object current with respect to time. The controller causes the switch to be in the connecting state and causes 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 causes 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.