Patent ID: 7304868
Filing Date: 2007-12-04
Classification: H02M,Y02B

Abstract:
1. A DC converter having a transformer including primary and secondary windings that are loosely coupled with each other, a main switch connected in series with the primary winding, and a series circuit being connected to ends of one of the primary winding and the main switch and including a clamp capacitor and an auxiliary switch, the main and auxiliary switches being alternately turned on/off so that a voltage of the secondary winding of the transformer is synchronously rectified with synchronous rectifiers and is smoothed with smoothing elements to provide a DC output, the DC converter comprising: a tertiary winding provided for the transformer and being tightly coupled with the primary winding; a voltage source configured to provide a voltage lower than a voltage generated by the tertiary winding; and clamp diodes configured to clamp the voltage generated by the tertiary winding with the use of the voltage source, the clamp diodes providing voltage-clamped signals to drive the synchronous rectifiers.