基于饱和电感的DC/DC开关变换器特性分析

移相全桥DC/DC变换器以其电路结构简单、开关损耗小、控制方便等优点在许多中大功率场合中得到了普遍的应用，但该变换器存在滞后桥臂换流困难、占空比丢失等问题，导致电路环流损耗增加，降低了变换器效率。针对以上问题，设计了一种基于饱和电感的DC/DC开关变换器。在分析变换器电路工作过程的基础上，讨论了饱和电感对电路局部谐振的影响，给出了饱和电抗器设计方法。最后通过实验验证了理论分析的正确性和可行性，实现了滞后桥臂的零电流开关，降低了环流能量，提高了DC/DC变换电路的效率。

Analysis of DC/DC Switching Converter Based on Saturable Inductor

The phase-shifted full-bridge DC/DC converter has been widely applied in many medium- and high-power scenarios owing to its simple circuit structure, low switching loss, and convenient control, etc. However, due to problems such as the difficult switching of the lagging-leg and the loss of duty cycle, the loss in current circulation will increase, thus reducing the efficiency of the converter. To solve the above problems, a DC/DC switching converter based on saturable inductor was designed in this paper. On the basis of the analysis of the converter circuit''s working process, the influence of saturable inductor on the local resonance of the circuit was discussed, and a design method for the saturable reactor was given. At last, the correctness and feasibility of the theoretical analysis were verified by experimental results. It was shown that the zero-current switching of the lagging-leg was realized, the energy of circulation was reduced, and the efficiency of the DC/DC converter circuit was improved.