The invention discloses a synchronous rectification
leading edge blanking self-adaptive adjustment method adaptive to double-
transistor flyback. The method comprises the following steps: detecting the turn-on time of a driving
signal of a synchronous rectification controller and the high level time of a high-
voltage detection
signal; calculating a first duty ratio and a second duty ratio; judging whether a
leading edge blanking time self-adaptive adjustment closed-loop condition is met or not; when the turn-on time of the driving
signal is increased and is close to the high level time of the high-
voltage detection signal, adjusting is stopped, and the current
leading edge blanking time is maintained; and if the turn-on time of the driving signal is not increased to be greater than the leading-edge blanking time after the leading-edge blanking time is adjusted by the
synchronous rectifier within the preset
time range, the leading-edge blanking time is traced back to a default value. According to the method, the leading edge blanking
algorithm is optimized in the synchronous rectification controller, so that the change of
system power parameters is avoided to the greatest extent, the design complexity of a power supply
system is reduced, and the risks of efficiency reduction and temperature rise and heating caused by repeated design and mistaken starting of the
system are avoided.