Design of short-circuit protection circuit for half bridge topology switching power supply

摘要

Half bridge switching power supply has problems such as poor capacitive starting capacity and easy malfunction of short-circuit protection circuit. Then a new type of short-circuit protection circuit for switching power supply is designed. The circuit is for sampling and protection based on half bridge partial voltage capacitance ripple characteristics. It has the advantages of rapid fault protection adjustable trigger time and recovery time. It shows that the circuit scheme has a good protective effect on the power converter in various load environments, and it has reached desired effect, according to the simulation results and the circuit application results.