Patent ID: 6979977

Claim:
Control apparatus for a power source system in an automotive vehicle, having a motor generator connected mechanically to an engine, and an inverter apparatus connected electrically to said motor generator, comprising: a high voltage power source system comprising a first battery connected electrically to said inverter apparatus; a voltage conversion apparatus connected electrically to said first battery, for converting an output voltage of said first battery to a designated voltage; a low voltage power source system comprising a low voltage battery which is connected to an electric load and supplies said electric load with a voltage lower than a voltage of said first battery; and a power source control apparatus for controlling at least an operation of said voltage conversion apparatus; wherein, when said engine stops or a key switch is turned off, if electric power can be supplied from said first battery to said low voltage power source system, said power source control apparatus causes electric power to be supplied from said first battery through said voltage conversion apparatus to said low voltage power source system, and if electric power cannot be supplied from said first battery to said low voltage power source system, said power source control does not cause electric power from said low voltage battery to be supplied as an electric power to said low voltage power supply system.