Patent ID: 7542310

Claim:
A synchronous rectification control circuit, including a pulse width control unit for generating a working cycle signal, and driving an output driving unit to turn on at least one output switch unit and change the electric power passing through a primary side of a transformer, and a secondary side of the transformer uses a rectification driving unit to drive at least one rectification unit and an electric power conversion circuit for an electric power conversion, wherein the synchronous rectification control circuit comprises: a logic operation unit, for receiving the working cycle signal, and producing a switching signal; a signal transmission unit, coupled to the logic operation unit for obtaining the switching signal, and transmitting the switching signal to a rectification driving unit of a secondary side of the transformer, and the switching signal drives the rectification driving unit to change the working conditions of the rectification unit and generates and transmits an acknowledge signal to the signal transmission unit, and the signal transmission unit transmits the acknowledge signal to a logic operation unit of the primary side of the transformer, such that the logic operation unit receives the acknowledge signal and outputs the working cycle signal to the output driving unit, and the output driving unit drives the output switch unit to be turned on or off according to the working cycle signal.