毕业设计用于电动汽车的双向DC-DC变换器研究与仿真

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

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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 efficiency 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.