倍流整流式不对称半桥DC/DC变换器软开关分析

ZVS Analysis of the Asymmetrical Half-Bridge DC/DC Converter with Current Doubler Rectification

分析了倍流整流式不对称半桥变换器的工作原理 ,并推导得出变换器实现零电压软开关 (ZVS)的条件 .为了克服漏感过大对变换器带来的不良影响 ,在分析励磁电流对ZVS作用的基础上 ,提出了通过减小励磁电感来减小漏感的方法 .仿真结果表明 ,采用该方法的变换器只需很小的漏感就可在全负载范围内实现ZVS ,且有效减小了占空比丢失 .

The principle of the asymmetrical half-bridge converter with current doubler re ctification was analyzed, and the ZVS (Zero-Voltage-Switched) conditions of th e converter were deduced. In order to eliminate the influence resulted from the big leakage inductance, a method was proposed to reduce the leakage inductance b y releasing the magnetizing inductance. This method is based on the analysis of the effect of the magnetizing current on the ZVS of the converter. Simulated res ults confirm that the proposed converter can achieve ZVS at rated load even with very small leakage inductance and can effectively reduce the duty cycle loss.