Zhu Bo-limiting method and apparatus having a function of suppressing the short pulse

Zhu Bo short pulse having a function limiting method of inhibiting relates to a switching power supply current protection technical field, it is an object to solve the problem of the short pulse signal Zhu Bo-limiting process. Comprising the steps of: when overcurrent fault timer is started, and this time determines the PWM input signal has been applied time tH, if the time tH Tsetl than the predetermined time, the block driving signal; if the time is less than the predetermined time tH Tsetl, the drive delay block signal delay Tdelay1 = Tset1-tH; when overcurrent fault signal is reset, and the determination signal is set to low flow over a low PWM signal at input time tL, if more than a predetermined time Tset2, the release driving signal; if less than the predetermined time Tset2, delayed release of the drive signal, delay Tdelay2 = Tset2-tL.