一种新型无源软开关BUCK变换器的设计  

Design of Novel Passive Soft Switching Buck Converter

作　　者：夏守行[1] 毛小群[2] 

机构地区：[1]浙江工贸职业技术学院电子工程系,浙江温州325003 [2]重庆电子工程职业学院应用电子学院,重庆401331

出　　处：《电气技术》2017年第2期97-101,共5页Electrical Engineering

摘　　要：在一个较大功率的Buck变换器的主开关电流通路上,串入一个小电感,以实现主开关的零电流开通。当主开关关断时,小电感的续流电能供给冷却风扇电路,转化为机械能释放,用于功率器件的降温,并同时实现风扇风速随输出功率增大而变快的目的。而主开关的零电压关断,则由一LC谐振电路来实现,该谐振电感的主要部分并不串在主电流通路上,谐振电感量可选得大一些,可明显降低谐振电流的峰值。本文分析了软开关的工作过程,推导了元件参数的选择方程,并通过分析和实验表明了电路设计的正确性。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.

关 键 词：BUCK变换器 软开关 冷却风扇 LC谐振电路 

分 类 号：TM46[电气工程—电器]