Alternating current power source apparatus for car

Claim 1

An alternating current power source apparatus which comprises an AC generator outputting a three-phase signal having a field coil which is driven by an engine; a battery for supplying a field current to the field coil of said AC generator; a first rectifier having three gated thyristors, each one of which is associated with one of said three phases of said generator output, which rectify the AC output of said AC generator; a second rectifier having three gated thyristors, each one of which is associated with one of said phases of said generator output, which is connected in parallel to said first rectifier and said AC output of said generator and is connected to give an output having a polarity reverse to the polarity of the output of said first rectifier; a load driven by single phase AC power connected to said first and second rectifier; a voltage control device responsive to said outputs of said first and second rectifiers for controlling the output voltage of said generator to a predetermined value by controlling a field current passing from said battery through said field coil; an oscillator for oscillating at a desired frequency; and a gate signal generating circuit which is controlled by said oscillator so as to feed a turn-on signal alternately to the gate of the thyristors of said first rectifier and the gate of the thyristors of said second rectifier.