一种新型高效电动汽车双向DC-DC变换器

电动汽车与电网端的能量传递过程受到广泛研究。以电动汽车用CLLC式双向DC-DC变换器为基础，在电动汽车端增加了超级电容交错并联倍流储能放能回路，提出一种新型高效双向DC-DC变换器。对新型高效双向DC-DC变换器的正向和反向工作过程进行分析，研究了增益特性，提出了开关管实现零电压开关（ZVS）的条件，对开关管电应力进行分析。制作了800 W试验样机，样机测试结果验证了新型双向DC-DC变换器中开关管能实现ZVS，开关管峰值电流小，与传统双向DC-DC变换器相比，效率得到提升。

A Novel Efficient Bi-Directional DC-DC Converter for Electric Vehicle

The process of energy transfer between electric vehicle and power grid end is widely studied. Based on CLLC bi-directional DC-DC converter used in electric vehicle, a super capacitor staggered parallel current-doubling energy storage and discharge circuit is added to the electric vehicle end. A novel efficient bi-directional DC-DC converter is proposed. The forward and reverse operation processes of the novel DC-DC converter are analyzed, and the gain characteristics are studied. The conditions for realizing zero voltage switching (ZVS) of switch tube are put forward, and the electrical stress of switch tube is analyzed. An 800 W experimental prototype is made. Test results of the prototype prove that ZVS can be realized in the novel bi-directional DC-DC converter. The peak current of the switch tube is small, and the efficiency of the DC-DC converter is improved.