Design of Novel Passive Soft Switching Buck Converter
Xia Shouxing1, Mao Xiaoqun2
1. Department of Electronic Engineering, Zhejiang Industry & Trade Vocational College, Wenzhou, Zhejiang 325003; 2. College of applied Electronic, Chongqing College of Electronic Engineering, Chongqing 401331
Abstract On the main switch current path of Buck converter of large power, a small inductance is connected in order to realize the zero-current switching of the main switch. When the main switch is turned off, the continuous current of the small inductance can be supplied to the cooling fan circuit, which means the electricity energy is transferred to the mechanical energy which is used to cool the power devices in return. At the same time, the speed of the fan is increased in consistent to the power increasing power of the switch. The switching-off of the switch with zero-voltage is realized by LC resonance circuit. The main part of it does not connect with the main circuit path. The inductance of the resonance should be a little larger so as to reduce the peak of current of the resonance. In this paper, the working process of soft switch is analyzed and the selection equation of element parameters is derived. The correctness of circuit design is demonstrated by analysis and experiment.
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2017, Vol. 18 
