附加LC的正反激组合变换器辅助电感最佳工作模态及LC参数优化设计  

Analysis of the Optimal Operating Mode of Auxiliary Inductance and LC Parameter Optimization Design of Forward-Flyback Converter with Additional LC

作　　者：刘树林[1] 王航杰 胡传义 张海亮 王斌 Liu Shulin;Wang Hangjie;Hu Chuanyi;Zhang Hailiang;Wang Bin(School of Electrical and Control Engineering Xi’an University of Science&Technology,Xi’an 710054 China)

机构地区：[1]西安科技大学电气与控制工程学院,西安710054

出　　处：《电工技术学报》2022年第2期389-396,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51777167,51604217)。

摘　　要：为减小正反激组合变换器的输出电压纹波,提出一种附加LC的正反激组合变换器。依据附加LC的电压电流波形,分析所提出正反激组合变换器的工作原理及能量传输过程,得出使得辅助电感电流不发生倒流且确保正激电感和辅助电感的叠加电流纹波最小的最佳工作模态。分析工作于最佳工作模态下的输出纹波电压,指出其随辅助电感的减小而减小;在给定输入电压和负载变化范围内,推导出正激电感分别工作于连续导电模式(CCM)和不连续导电模式(DCM)时使得辅助电感电流不发生倒流的临界条件,据此提出一种辅助电感和电容的优化设计方法。实例及实验结果验证了理论分析的正确性及所提出优化设计方法的可行性。In order to reduce the output voltage ripple of the forward-flyback converter,a forward-flyback converter with additional LC was proposed.According to the voltage and current waveforms of the additional LC,the working principle and energy transmission process of the proposed forward-flyback converter were analyzed,and the optimal operation mode was obtained to ensure that the current of the auxiliary inductor is not reversed while the superimposed current ripple of the forward inductor and the auxiliary inductor is minimized.The output ripple voltage in this mode decreased with the decrease of the auxiliary inductor.Within a given range of input voltage and load variation,the critical conditions for the auxiliary inductor current not to reverse when the forward inductor work in continuous conduction mode(CCM)and discontinuous conduction mode(DCM)were derived respectively.Thus,an optimal design method of auxiliary inductors and capacitors was proposed.Examples and experimental results verify the correctness of the theoretical analysis and the feasibility of the proposed optimization design method.

关 键 词：正反激 输出纹波电压 工作模式 优化设计 

分 类 号：TM46[电气工程—电器]