Patent ID: 8063672

Claim:
A circuit, comprising: a high side switch coupled between a positive input terminal and a first terminal of a primary transformer winding; a low side switch coupled between a negative input terminal and the first terminal of the primary transformer winding; a first control circuit coupled to the high side switch, the positive input terminal and the first terminal of the primary transformer winding, the first control circuit coupled to sense a voltage across the positive input terminal and the first terminal of the primary transformer winding to control the high side switch in response to the sensed voltage across the positive input terminal and the first terminal of the primary transformer winding; and a second control circuit coupled to the low side switch, the first terminal of the primary transformer winding and the low side input terminal, the second control circuit coupled to sense a voltage across the first terminal of the primary transformer winding and the low side input terminal to control the low side switch in response to the sensed voltage across the first terminal of the primary transformer winding and the low side input terminal.