Method and apparatus for simplifying the control of a switch

摘要

A half bridge converter includes a transformer with a high side switch coupled between a first input terminal and a primary winding of the transformer. A low side switch is coupled between a second input terminal and the primary winding. A first control circuit is coupled to the first input terminal and the primary winding to control the high side switch in response to a rate of voltage change with respect to time across the high side switch while the high side switch is off. A second control circuit coupled to the primary winding and the second input terminal to control the low side switch in response to a rate of voltage change with respect to time across the low side switch while the low side switch is off.