Patent ID: 8400118

Claim:
An output control apparatus of a generator including a generator winding and an excitation winding wound around a stator side, a field winding wound around a rotor rotated by a drive source, a rectifier for rectifying a current generated by the excitation winding, a smoothing capacitor for smoothing an output current of the rectifier and inputting the smoothed output current to the field winding, a first switching device connected to the field winding and PWM controlled to converge an output voltage of the generator winding to a target voltage, and a flywheel diode connected to the field winding, the output control apparatus of a generator comprising: a second switching device connected in parallel to the flywheel diode and driven in a phase reverse to a phase of the PWM controlled drive signal; a duty ratio monitoring unit which determines whether a duty ratio of a drive signal of the first switching device is equal to or larger than a reference duty ratio; and PWM output cycle extension unit which prolongs an output cycle of the drive signal when the duty ratio monitoring unit determines that a duty ratio of the drive signal is not equal to or larger than the reference duty ratio longer than the output cycle of the drive signal when the duty ratio monitoring unit determines that the duty ratio of the drive signal is equal to or larger than the reference duty ratio.