A DC to DC power converter includes synchronous rectifiers which respond to a
control
waveform. Negative current from a load into the power converter is prevented by
increasing the converter output voltage at a minimum current limit. The synchronous
rectifiers may be held off in response to decision logic by activation of a hold-off
circuit connected to a control terminal of a synchronous rectifier or of an ORing
transistor at the converter output. When the synchronous rectifier is subsequently
enabled, its control waveform may be increased slowly relative to the switching cycle.
