Patent ID: 7049789

Claim:
An automotive power supply system, comprising: an electric generator which is driven by an output of an internal combustion engine of a vehicle to produce an electrical energy; a plurality of storage batteries which are charged by the electrical energy produced by said electric generator, said storage batteries working to supply electric power to electric devices mounted in the vehicle; a switching device working to establish an electric connection between a selected one of the storage batteries and the electric generator to charge the selected one; and a switch drive controller working to control an operation of said switching device, wherein the storage batteries are different in charging impedance from each other, and said switch drive controller controls said switching device to connect said generator to one of the storage batteries which is lower in the charging impedance than any other of the storage batteries when the vehicle is decelerating; and wherein said switch drive controller also works to increase an amount of electricity produced by said generator when the vehicle is decelerating.