Synchronous rectifier circuit powered by a portion of secondary windings

Abstract

A synchronous rectifier circuit is self-powered by a portion of a secondary winding. A transformer has a primary winding arranged to receive power from a power source, a secondary winding arranged to transfer power to a load, and a tapped output arranged to transfer power to a controller circuit, wherein the tapped output is formed from a portion of the secondary windings. The controller circuit uses power from the tapped output to drive a synchronous switch disposed between the secondary winding and the load. The synchronous switch rectifies the power received from the secondary winding such that DC power can be supplied to a load.

Dependencies are inferred from the claim text.