Current reverse flow protection method and device and synchronous rectification circuit

The invention provides a current reverse flow protection method and device and a synchronous rectification circuit. The method includes the steps that output reverse flow currents of a target module output power circuit are sampled in real time and compared with a preset reference signal, output voltage control signals for controlling output voltages of the target module power circuit are acquired according to the comparison result, the output voltages of the target module output power circuit are adjusted, and then operation can be conducted in the state that the output reverse flow currents of the target module output power circuit are smaller than or equal to the preset reference signal. Thus, the probability that the target module output power circuit is damaged due to the overlarge output reverse flow currents is reduced. 本申请提供种电流反灌保护方法、装置和同步整流电路，本方法实时采样所述目标模块输出功率电路的输出反灌电流，将其与预设基准信号进行比较，依据比较结果得到对目标模块功率电路的输出电压进行控制的输出电压控制信号，通过对所述目标模块输出功率电路的输出电压进行调节，即可使得所述目标模块输出功率电路的输出反灌电流小于或等于所述预设基准信号的状态下运行，因此，降低了所述目标模块输出功