Patent ID: 6424544
Filing Date: 2002-07-23
Classification: H02M,Y02B

Abstract:
A continuous mode flyback converter comprising:a primary and a secondary side, the secondary side comprising a secondary winding, the secondary side further comprising an auxiliary winding, a first terminal of the auxiliary winding being connected to the gate of a FET transistor and a second terminal of the auxiliary winding being connected to the source of the FET transistor, wherein the secondary side further comprises a PNP transistor, the collector of the PNP transistor being connected to the source of the FET transistor, and the base of the PNP transistor being connected to the first terminal of the auxiliary winding, the secondary side further including a capacitor interconnected between the first terminal of the auxiliary winding and the gate of the FET transistor, and wherein the FET transistor is conducting when a switch on the primary side is open, so that the converter operates in a flyback manner where energy is transferred during off or open period(s) of the switch.