无源软开关电路拓扑的研究

提出一个研究无源软开关电路的新技术方法;其特征是对基本的单管隔离型PWM DC/DC变换器进行类比分析,由此直接导出可行的缓冲能量再生复位电路.该新方法能使DC/DC PWM硬开关变换器转变为软开关变换器.以新型Boost无源软开关变换器为例,进行了电路理论分析与中功率样机的实验测试;结果表明此新变换器具有较宽的软开关工作范围、较低的电应力、较小的缓冲元件量值等特点.由此认为,这种研究方法推导简单、物理意义清晰,还能深入地研究无源软开关的新电路拓扑.

Study on topology of the passive soft-switching circuit

A new approach of the passive soft-switching circuits is presented. Its feature is making use of the analogous analysis of single switch isolated type of basic PWM DC/DC converters. So, feasible regenerative reset circuits of snubbing energy are derived directly. DC/DC PWM hard-switching converters can be changed to soft-switching converters by the new approach. Take an example for the new Boost converter, the circuit is analyzed theoretically and a middle power of sample workpiece is tested. All are shown that the new converter has characteristics of wider soft-switching range, lower electrical stress, and smaller magnitude of snubber components. Thus this approach has advantages of simple derivation and clear physical meaning. Moreover, it can make the research on the passive soft-switching circuit deeply.