一种高升压比软开关DC/DC变换器的研究

摘要

Cuk变换器因其输入、输出电流连续且脉动小等优点,在一些对输入、输出电流纹波要求较高的中小功率场合,得到了广泛应用.在隔离型Cuk电路的基础上,提出了一种具有高升压比的新型软开关电路,该电路具有高升压比的特点,且所有开关管均工作在软开关状态,特别适用于光伏板、蓄电池和燃料电池等低电压输入的应用场合.对该变换器的工作原理进行了详细分析,并通过实验验证了理论分析的正确性.%Because of continuous input and output current,and low current ripple,Cuk converter is widely used in medium and small power system,which has higher requirements on the ripple of input and output current.On the basis of isolated Cuk converter,a novel soft-switching circuit with high step-up ratio is proposed,it has the feature of high step-up ratio and all switching tubes work in soft-switching state.It is suitable especially for low input voltage systems,like solar panels,batteries and fuel cells.An analysis on how it works in details is given,and the experimental results prove the correctness of theoretical analysis.