交错并联Buck变换器本质安全的研究

Research on Essential Safety for Interleaving Buck Converter

为使Buck变换器以较小的最大输出短路释放能量满足本质安全要求,提出将交错并联技术应用于Buck变换器,以两支路交错并联Buck变换器为例进行研究,在与传统Buck变换器总输出电流相同的情况下,使电路的总电流输出纹波减小,输出电压纹波减小,且支路电流为总电流的1/2,减小了开关管和续流二极管的电流应力,总输出电流纹波频率变为支路的2倍,使输出滤波电容减小,这些都有利于实现本质安全。通过Matlab仿真比较本质安全的传统Buck变换器和交错并联变换器,最后证明所提方法的正确性。

In order that the max released energy of the output short circuit is less for meeting the essential safety re- quirements in the Buck converter,this paper proposes that a interleaving technique is applied into the Buck converter,and takes two-interleaving Buck converter for example.In the same total output current,the interleaving Buck converter makes the total output current ripple and the output voltage ripple decrease.The branch current is half of two the total current, which can decrease the current stress of the switch tubes and diodes.The total frequence is 2 times bigger than the branch one,which can reduce the output filter capacitance.These are beneficial to the re- alization of essential safety.Through the comparison of the traditional Buck converter and the interleaving converter in Matlab, the result proves the correctness of the proposed method.