Patent ID: 9030848
Filing Date: 2015-05-12
Classification: H02M,Y02B

Abstract:
1. A DC to DC converter having a transformer including a primary winding and a secondary winding, the primary winding being ON-OFF driven with a DC power supply and a semiconductor switch in the primary winding side and voltage of the secondary winding being synchronously rectified, the DC to DC converter comprising: an antiparallel-connected circuit of a diode and a MOSFET for rectification; a snubber circuit composed of a reverse-blocking semiconductor switch and a capacitor, the snubber circuit being connected in parallel with the antiparallel-connected circuit; and a controller circuit for controlling the MOSFET, the controller circuit comprising a power supply that is connected to both terminals of the capacitor composing the snubber circuit; wherein the reverse-blocking semiconductor switch is driven either by signals for adjusting a voltage of the capacitor within a permitted range of voltage of the power supply of the controller circuit, or by signals that are determined by a signal obtained from voltage across the MOSFET and by the signals for adjusting a voltage of the capacitor within a permitted range of the power supply of the controller circuit.