A Novel ZVS Step-down Chopper Circuit

Hao Zhang, Yinhuai Que, Tianmu Chen


In this paper, a new Buck soft-switching topology is proposed to overcome the shortcomings such as large switching losses and strong noise in traditional Buck circuits. The new Buck soft-switching circuit adds auxiliary switches and series resonant circuits. The auxiliary switch is used to control the working state of the series resonant circuit, and then the resonant current generated by the resonant circuit to promote the main switch of the parallel capacitor discharge, the main switch zero voltage conduction and shutdown. Soft-switching technology is a good solution to the traditional Buck circuit defects, improve the efficiency of the circuit. In this paper, the working principle of the new Buck soft-switching circuit is analyzed in detail, and simulation is carried out to ensure the circuit's accuracy.


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