This thesis pertains to a forward converter consisting only of primary-side control circuits for regulating the output voltage. Control circuits in a conventional forward converter for regulating the output voltage control the on and off times of primary-side switching transistor by comparing the output voltage directly with the reference voltage. To isolate the primary from the secondary, the converter must contain not only the main transformer but also insulated transformers in control circuit power supply and transistor driver circuits. Since the forward converter described in this thesis converts output voltage to primary-side voltage proportioned to the output voltage by the main transformer, all control circuits in the converter can be configured on the primary side; to isolate the primary side from the secondary side, only the main transformer need be insulated. The converter generates a fly-back voltage from energy stored in the main transformer by turning a transistor on and cramps the voltage at a level proportional to the output voltage. This thesis describes how this forward converter produces stable output.