Half bridge flyback and forward

摘要

A circuit includes a transformer having a first winding and a second winding, an input connected to a first terminal of the first winding, a first power transistor and a second power transistor. The first power transistor has a source, a gate, and a drain connected to a second terminal of the first winding. The second power transistor has a source connected to ground, a gate connected to a pulsed voltage drive source and a drain connected to the source of the first power transistor. The gate of the first power transistor is connected to a DC source or the same pulsed voltage drive source as the gate of the second power transistor. The first power transistor actively turns off independent of load current. Other circuit embodiments and corresponding load switching methods are also provided.

主权项

1. A circuit, comprising:
a transformer having a first winding and a second winding; an input connected to a first terminal of the first winding; a first power transistor having a source, a gate connected to a DC source, and a drain connected to a second terminal of the first winding; and a second power transistor having a source connected to ground, a gate connected to a pulsed voltage drive source, and a drain connected to the source of the first power transistor, wherein the first power transistor actively turns off independent of load current.