Power-supply control device

摘要

An electric power is surely supplied to a load even if an abnormality is generated in a switching control circuit, which controls a switching part that switches electric connection between a power supply and the load of a vehicle. The switching control circuit controls a state of a contact of a keep relay that switches the electric connection between the power supply and the load. A monitor circuit monitors existence or non-existence of the abnormality of the switching control circuit. When detecting the abnormality of the switching control circuit, the monitor circuit transmits a reset signal in order to reset a state of the switching control circuit. When receiving the reset signal from the monitor circuit, an abnormal-time connection circuit transmits a connection signal to a coil of the keep relay to bring a movable contact into contact with a contact. For example, the present invention can be applied to a power-supply control device for the vehicle.

主权项

1. A power-supply control device that controls supply of an electric power from a power supply of a vehicle to a load of the vehicle by controlling a switching part, the switching part switching electric connection between the power supply and the load, the switching part becoming a first state in which the power supply is electrically connected to the load when a first control signal is transmitted, the switching part becoming a second state in which the power supply is electrically disconnected from the load when a second control signal is transmitted, the switching part being able to retain the state even if the supply of the control signal is stopped, the power-supply control device comprising:
a switching control circuit that transmits the first control signal and the second control signal to the switching part to control the state of the switching part; a monitor circuit that monitors existence or non-existence of an abnormality of the switching control circuit, and transmits a reset signal to the switching control circuit in order to reset the state of the switching control circuit when detecting the abnormality of the switching control circuit; and an abnormal-time connection circuit that transmits a third control signal to the switching part in order to set the switching part to the first state when the monitor circuit transmits the reset signal to the switching control circuit, wherein the reset signal is a pulsed signal, and wherein the abnormal-time connection circuit transmits the third control signal to the switching part after a plurality of pulsed reset signals are transmitted.