毕业设计(论文)
题    目  用于电动汽车的双向 DC-DC交换器研究与仿真
专业 学生姓名 班级学号 指导教师 指导单位
日期:     年月日至    年月日

毕业设计 (论文) 原创性声明
本人郑重声明:所提交的毕业设计(论文)，是本人在导师指导下，独立进行 研究工作所取得的成果。除文中己注明引用的内容外，本毕业设计(论文)不包 含任何其他个人或集体已经发表或撰写过的作品成果。对本研究做出过重要贡献 的个人和集体，均己在文中以明确方式标明并表示了谢意。
论文作者签名:
日期:    年月    日

随着能源、环保等问题的日益突出，电动汽车成为近年来发展迅速的一种新
型汽车，是 21 世纪最具有发展前途的绿清洁汽车。电动汽车是用电池替代传统 的汽油作为车载能源的，然而在现有的技术条件下，动力电池的性能是电动汽车 发展的主要瓶颈。双向 DC-DC 变换器可以优化电动机控制、提高电动汽车整体的 效率和性能。
针对双向 DC-DC 变换器存在的开关损耗高等问题，本文研究了一种隔离型双 向软开关 D
C-DC 变换器。在介绍变换器工作原理的基础上，本文着重分析了电压、 电流的变化规律，特别是推导出各开关元件实现软开关的条件及其数学表达式， 并得到了实现软开关的通用条件。最后通过 Saber 软件对电路在两种模式下的稳态 工况和软开关特性进行仿真研究，仿真结果证明根据该通用条件设计的变换器能 够在大负载范围内实现软开关。
关键词: 双向 DC-DC 变换器; PWM 控制:移相控制: 软开关

ABSTRACT
Electric Vehicle(EV) becomes a kind of new，fast-developing vehicle in the last years，which has the best futureωa green vehicle，as 由e problems of energy and environment are becoming more and more serious in the 21st centur予 The energy in EV is provided by storage batteries instead of traditional gasoline and the development of EV 町e limited by the capacity of its storage batteries with current technologies. It can improve 由e performance of the storage batteries and the working eff电动汽车技术论坛iciency of driving systems by using bidirectional DCIDC converter in Electric Vehicle at present.
A soft switching bi-directional DCIDC converter was developed to reduce switching losses. Operation principle of the proposed converter is introduced. The soft switching principle is also introduced briefly. On the basis of the operational analysis， the characteristic of the voltage and current is illustrated and the ZVS conditions of the different switches are also given in detail. What is more，the formula of the universal ZVS condition for all the switches is specially deduced to s扫nplify the four ZVS conditions into one formula for the convenience of the design. And the steady state
conditions and soft switching characteristic of the circuit in those two operating mode， are demonstrated by the Saber，experimental results obtained from the converter are shown to veri句r the validity of the universal ZVS condition.
Key words: Bi-Directional DCIDC converter; PWM control; Phase-shlft control; Soft switching