Patent ID: 9030140
Filing Date: 2015-05-12
Classification: B60R

Abstract:
1. An in-vehicle power supply system comprising: a DC power source; a steering power converter converting an electric power supplied from the DC power source, and providing the electric power converted to a steering assist motor that assists a steering operation of a vehicle; a steering drive control unit being supplied with an electric power from the DC power source, and controlling the steering power converter; a plurality of voltage-reducing devices being coupled in parallel to each other, between the DC power source and the steering drive control unit, each of the voltage-reducing devices reducing a power source voltage of the DC power source to generate a reduced voltage lower than the power voltage when being operated, and a voltage-reducing control unit determining whether to operate or to stop operation of each of the voltage-reducing devices according to a temperature of each of the voltage reducing devices such that at least one of the voltage-reducing devices is in operation.