Electric power supply system for automobile.

摘要

This specification discloses an electric power supply system for an automobile having a load which needs a higher voltage than the normal battery voltage. The electric power supply system of the present invention includes: a multi-phase AC generator (1) having an armature winding (10), a field winding (12), a first rectifier (11) for rectifying a multi-phase AC output (U, V, W) of the armature winding, and a voltage regulation circuit (13) for controlling a current in the field winding in accordance with a control signal to regulate an output voltage of the first rectifier; a battery (2) charged by a DC output voltage (B) of the first rectifier; a low-voltage load (3) to be powered by the battery; a multi-phase transformer (61) including a primary winding connected to a multi-phase AC output of the armature winding and a secondary winding for inducing a secondary multi-phase voltage higher than the voltage in the primary winding, the primary and secondary windings being electrically insulated from each other; a second rectifier (62) for rectifying the multi-phase secondary voltage from the multi-phase transformer; and a high-voltage load to be powered by a DC output (G+, G-) of the second rectifier.