Importance

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Abstract

A controller of a power supply control device includes: a comparison circuit configured to compare a parameter related to a power supply failure of a first system or of a second system with a threshold and to output a detection signal indicating an occurrence of the power supply failure; a pulse generator configured to output a pulse signal having a predetermined pulse width in response to receiving the detection signal and to disconnect the connection device to disconnect connection between the first system and the second system during a period in which the pulse signal is output; a latch circuit configured to latch the pulse signal; and a microcomputer configured to periodically acquire a latch state of the latch circuit and to determine, in response to detecting that the pulse signal is latched, in which of the first system and the second system the power supply failure occurs.

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First Claim