Abstract: A rectifier for a DC/DC converter includes first and second FETs, first and second capacitors, and first and second resistors. The first FET is connected in series with the secondary winding of a main transformer of the DC/DC converter. The second FET is connected in parallel with the series circuit constituted by the secondary winding of the main transformer and the first FET. The first and second capacitors are respectively connected between the gate of the first FET and the drain of the second FET and between the gate of the second FET and the drain of the first FET. The first and second resistors are respectively connected between the gate and source of the first FET and between the gate and source of the second FET.

Abstract: According to this invention, a converter includes a voltage transformer, a switching transistor, a resistor, a control transistor, and a control circuit. The voltage transformer has a primary winding, a secondary winding, and a control winding. The switching transistor is connected in series with the primary winding. The resistor is connected between the switching transistor and one terminal of an input power source. The control transistor has a base connected to a connection point between the resistor and the switching transistor and a collector connected to a control electrode of the switching transistor. The control circuit controls the control transistor on the basis of a control voltage extracted from the control winding.