RELIABLE DC-DC CONVERTER DRIVE CIRCUIT.

A current transformer converter drive configuration is described. The circuit is simple, prevents spurious retriggering of the switching element, allows operation from 50% to zero duty cycle, and has very low power requirements. It is especially suited to applications where a wide input-voltage range must be tolerated, and can be driven by any standard converter control system. This circuit has been used as the basis of dc-dc converters which operate from 5 to 40v input, with an efficiency over the full input voltage range of 64-75% at a 7w, 10v output.