US 12,109,959 B2
Power supply device and method that determine location of fault in first and second power supply systems
Takeshi Matsumoto, Kobe (JP); Daiki Hakushima, Kobe (JP); and Keiichi Yonezaki, Kobe (JP)
Assigned to DENSO TEN Limited, Kobe (JP)
Filed by DENSO TEN Limited, Kobe (JP)
Filed on Sep. 28, 2021, as Appl. No. 17/487,762.
Claims priority of application No. 2021-055172 (JP), filed on Mar. 29, 2021.
Prior Publication US 2022/0306020 A1, Sep. 29, 2022
Int. Cl. B60R 16/033 (2006.01); H02H 3/08 (2006.01); H02H 3/16 (2006.01); H02H 7/28 (2006.01); H02J 7/14 (2006.01)
CPC B60R 16/033 (2013.01) [H02H 3/08 (2013.01); H02H 3/16 (2013.01); H02H 7/28 (2013.01); H02J 7/1423 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A power supply device comprising:
a first system configured to supply electric power of a first power supply to a first load;
a second system configured to supply electric power of a second power supply to a second load;
an inter system switch configured to be able to connect and disconnect between the first system and the second system;
a determining unit configured to keep the inter system switch in an ON state in a normal operation so that the electric power of the first power supply is supplied to both the first load and the second load, and in response to detecting a ground fault of the first system or the second system during the normal operation, turn OFF the inter system switch and determine, after the turning OFF, which of the first and second systems the ground fault has occurred in; and
a suppression circuit configured to, after the turning OFF of the inter system switch, simultaneously perform (i) suppressing of an electric discharge of the second power supply and (ii) supplying of electric power for ground fault detection to the second system,
wherein the determining unit determines, after the turning OFF of the inter system switch, whether or not any ground fault has occurred in the second system based on the electric power which is supplied from the suppression circuit to the second system.