摘要在中小功率场合，半桥式DC-DC变换器出于电路结构比较简单、功率器件少、功率管上受到的电压应力小等优点，得到了较为广泛的应用。本文通过对半桥变换器的电路结构和工作原理进行分析，设计了一种额定功率为360w,将310V电压转换为48V的车载直流开关电源，该电源以半桥式开关变换器为主体，SG3525A芯片为控制核心，采用闭环控制方法，保证了系统的供电性能。文中详细介绍了高频变压器、PWM控制和驱动电路的设计方法，并在完成基本半桥变换器的设计基础上对软开关半桥变换器的工作原理进行了分析。两种半桥变换器的电路功能都通过SABER软件的仿真得到了验证。66229

毕业论文关键词：半桥变换器  PWM控制 软开关  saber仿真

毕业设计说明书（论文）外文摘要

Title  Design of a 360W DC-DC Vehicle-borne Power Supply

Abstract

In the medium or small power applications,  because of the simple circuit structure, less power devices, small voltage stress on the power tube, etc, Half-bridge DC-DC converter has been more widely used. Based on the analysis of the circuit structure and the working principle of the half-bridge inverter, this paper designed a Vehicle DC Switching Power with the rated power of 360w,witch can convert the 310V voltage to 48V . The power supply to the half-bridge switching converter as the main body, SG3525A chip as the control center, and the use of closed-loop control methods, to ensure the system's power performance.This paper describes the high-frequency transformer, PWM control and the method to design driving circuit.Based on completing the design of basic half-bridge converter ,the working principle of soft-switching half-bridge converter has been analyzed . The  functions of the two kinds of half-bridge converter have been verified by SABER simulation software.

Keywords: Half-bridge converter   PWM control   soft-switching   SABER simulation software

目次

1 绪论 1

1.1 四种基本电力变换电路 1

1.2 直流变换器类型 1

1.3 直流变换器的现状和发展趋势 3

1.4 本文研究的任务和主要内容 3

2 基于基本半桥DC-DC变换器的车载电源 4

2.1 基本半桥直流变换器的工作原理 4

2.2主电路参数设计 5

2.3 控制电路设计 8

2.4 驱动电路设计 11

2.5 设计结果仿真 14

2.6 本章小结 17

3 基于软开关半桥DC-DC变换器的车载电源 18

3.1 软开关技术的研究 18

3.2 软开关半桥DC-DC变换器的工作原理 19

3.3 实现软开关的条件 27

3.4 主电路参数设计 28

3.5 控制电路的设计 31

3.6 驱动电路的设计 33

3.7 设计结果仿真 34

3.8 本章小结 36

结论 38

致谢 39

参考文献 40