Synchronous rectification device

The invention discloses a synchronous rectifier, suitable for flexibly converting power converters. An integrated synchronous rectifier comprises a power transistor coupled between a transformer and the output of a power converter. A controller receives a pulse signal, and switches the on state of the power transistor. A switch control circuit generates a pulse signal according to a current signal, and generates a plurality of driving signals to switch a transformer according to a switch sinal. An insolation device is coupled between a switch control circuit and the power converter, so as to transmite the pulse signal. The switch signal is used for adjusting the power conveter, and the current signal is related to the switch current of the transformer.