Abstract: A power converter including a regulator responsive to a rectifier supplies a load with a regulated DC voltage. The regulator has a variable duty cycle output and responds to AC current and voltage components of the converter to tend to maintain an in phase relation of AC voltage and current output components of the rectifier. If the converter is a DC--DC converter, it includes a regulator responsive to a DC power source supplies a load with a regulated DC voltage. The regulator has a variable duty cycle output and responds to a DC power source voltage, load voltage and load current to maintain a regulated DC load voltage. The regulator responds to abnormal operation of the converter, e.g. overshoot occurring after a power interrupt, to initially quickly reduce the duty cycle, then quickly restores or be allowed to quickly restore the duty cycle to a large percentage of a target value therefor and then slowly restore the duty cycle to its target without overshoot.