一种不对称半桥正反激DC/DC变换器 An Asymmetric Half Bridge Forward-Flyback Hybrid DC/DC Converter

基于已有的有源钳位正反激DC/DC变换器，本文提出了一种新颖的不对称半桥正反激DC/DC变换器。将不对称半桥结构应用到有源嵌位正反激DC/DC变换器，继承了有源嵌位正反激DC/DC变换器高效率、高功率密度的特点，并将开关管电压应力大大减小。文章详细论述了该变换器的工作原理，给出了关键时序波形，并着重分析了稳态下的基本数量关系和软开关实现条件。在理论分析的基础上，使用saber进行仿真分析并制作了80 W实验样机，验证了该变换器理论分析的正确性。 Based on the existed active clamp forward-flyback hybrid DC/DC, a new asymmetric half bridge forward-flyback hybrid DC/DC converter is proposed in the paper. The asymmetrical half bridge structure is applied to active clamp forward-flyback converter, which inherits the characteristics of the active clamp forward-flyback converter with high efficiency and high power density, and the voltage stress of the switch is greatly reduced. In this paper, the operating principle of the converter is discussed in detail; the key time sequence is given; and realization conditions of soft switching and basic quantitative relationship in steady state are analyzed emphatically. Based on the theoretical analysis, saber is used to do simulation analysis and make an 80 W experimental prototype to validate the validity of theoretical analysis.