Synchronous rectification driving circuit suitable for central tapped structure rectifying circuit

The invention discloses a synchronous rectification driving circuit suitable for central tapped structure rectifying circuit, comprising a high frequency transformer T1, a current transformer CT1, an output capacitor C1, an output capacitor C1, a synchronous rectifying tube SR1, a synchronous rectifying tube SR2 and a driving circuit for driving the synchronous rectifying tube SR1 and the synchronous rectifying tube SR2, wherein the current transformer CT1 has two primary side windings N1, N2 and one secondary side winding N3, which can drive two synchronous rectifying tubes. The favourable effects of the invention are as follows: 1, it only needs one currant transformer and one secondary side winding to realize the driving of two SRs so as to simplify the circuit and reduce the cost; and thus it is good for the high frequency and integrated development; 2, it is able to realize supplying power by itself of the driving circuit; the driving is simple; 3, it reduces the driving power consumption of the synchronous rectification, improves the light loading efficiency, reduces the loss and lowers the cost.