Current control synchronous rectification drive circuits

The utility model discloses synchronous rectification drive circuits which are suitable for feeding the drive energy of two synchronous rectification tubes for T type voltage-doubling rectification back to an output simultaneously. The synchronous rectification drive circuits comprise a clamping and energy feedback circuit, a high-frequency transformer T1, a current transformer CT1, a middle energy storage capacitor C1, an output capacitor C2, a synchronous rectification tube SR1, a synchronous rectification tube SR2 and two drive circuits which are respectively used for driving the synchronous rectification tube SR1 and the synchronous rectification tube SR2, wherein the drive of an upper tube in a bridge arm which outputs voltage-doubling rectification can be clamped to the middle energy storage capacitor C1, and the excess drive energy of a lower tube is recovered to the same energy storage capacitor C1. The utility model has the following advantages: (1) the drive energy can be fully recovered, and the efficiency is enhanced; (2) the design requirement of the transformer is lowered, the number of the turns of signal windings is reduced, and the cost is lowered; and (3) the utility model can be used for the drive circuits of two transformers, also can be used for the drive circuit of a single transformer and has comparatively flexible application occasions.