Patent ID: 8476785
Filing Date: 2013-07-02
Classification: B62D,H02J

Abstract:
1. A power supply apparatus for a vehicle, comprising: a main power supply that supplies electric power to a plurality of vehicle-mounted electric loads; a voltage-boosting circuit that boosts an output voltage of the main power supply, and outputs the electric power, whose voltage is boosted, to a specific vehicle-mounted electric load among the plurality of the vehicle-mounted electric loads; a subsidiary power supply that is connected in parallel to a circuit that connects the voltage-boosting circuit to the specific vehicle-mounted electric load, wherein the subsidiary power supply is charged with the electric power output from the voltage-boosting circuit, and the subsidiary power supply assists supply of the electric power to the specific vehicle-mounted electric load using the electric power with which the subsidiary power supply is charged; a power supply change detection portion that detects a change in a state of the supply of the electric power from the main power supply; and a boosted-voltage control portion that controls the boosted voltage of the voltage-boosting circuit, based on the change in the state of the supply of the electric power detected by the power supply change detection portion, wherein the power supply change detection portion detects a degree of a change in the output voltage of the main power supply; and the boosted-voltage control portion decreases the boosted voltage of the voltage-boosting circuit when the change in the output voltage of the main power supply is a decrease in the output voltage of the main power supply, and a degree of the decrease is larger than a decrease threshold value.