Short circuit judgment and timing control method and circuit

The invention discloses a short circuit judgment and timing control method and circuit. According to the short circuit judgment and timing control method, a control timing strategy is designed by distinguishing short circuit, starting overcurrent and steady-state overcurrent by means of judgment, so that the short circuit temperature rise control and capacitive load capacity of a push-pull type orfull-bridge type converter are well balanced, namely, short timing and small control temperature rise in a short-circuit state are realized; timing is prolonged in an overcurrent state caused by a large capacitive load, so that high capacitive load capacity is guaranteed. Correspondingly, the short circuit judgment and timing control circuit comprises a detection and transmission module, a comparison module, a logic control and driving module and a rest timing module. 本发明公开了一种短路判定和计时控制方法及电路，本申请的短路判定和计时控制方法为通过区分短路、启机过流和稳态过流判定，设计控制计时策略，实现推挽式或全桥式变换器的短路温升控制与容性负载能力的兼顾，即实现短路状态下计时短，控制温升小；大容性负载导致的过流状态下计时延长，保证较高的容性负载能力。对应地，本发