In order to solve the problem of low efficiency when traditional Buck converter is used to charge the energy storage battery in photovoltaic energy storage system

a new type of active Buffer circuit is applied to the Buck converter.All semiconductor devices in the circuit can realize soft switching

which reduces the switching loss and improves the efficiency of the converter.Working principle and process of the converter are analyzed in detail

key components of the converter is designed

and the basis for the selection of switches and diodes are given.Correctness of the theoretical analysis is verified by simulation and building experimental prototype of the converter.