公开(公告)号：US20200049768A1

公开(公告)日：2020-02-13

申请号：US16655591

申请日：2019-10-17

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： KOJI MATSUKAWA ,  TAKASHI NAKAZAWA ,  SHIGEO MASAI

IPC: G01R31/327 ,  H01H47/00 ,  G01R31/00

Abstract: A relay welding detection device includes a voltage generator, first and second resistor strings, and a relay welding detector. A first relay is disposed on a first wiring line connecting a load to a first terminal of a direct-current power supply of a vehicle, and a second relay is disposed on a second wiring line connecting the load to a second terminal of the direct-current power supply. The first resistor string is connected in series to the first terminal of the direct-current power supply and the voltage generator therebetween, and the second resistor string is connected in series to the second terminal of the direct-current power supply and the voltage generator therebetween. The relay welding detector detects a potential at a connection point of two resistors of each of the first and second resistor strings to detect presence or absence of welding in the first relay and the second relay.