Patent ID: 7342811
Filing Date: 2008-03-11
Classification: H02M,Y02B

Abstract:
1. In a power recovery circuit for use in a DC-DC converter, the converter having an output winding ( 12 ), a main DC output terminal connected to one terminal of the winding through an output inductor (L 01 ) and an output capacitor (C 0 ) connected between the main output terminal and a return voltage with a MOSFET transistor switch having its drain and source terminals connected between the return and another terminal of the winding and a controller ( 18 ) for supplying the gate source drive current to the MOSFET independently of the output winding ( 12 ) to provide a synchronously rectified current to the main output terminal, the power recovery circuit comprising: a) a rectifier (D b) an auxiliary DC-DC converter connected between the auxiliary capacitor and an auxiliary output terminal to convert charge across the auxiliary capacitor to a direct current at a selected voltage at the auxiliary output terminal (