毕业论文12v220v纯正弦波车载逆变电源设计.doc

12V/220V车载逆变电源 摘 要 车载逆变器就是一种能把汽车上12V直流电转化为220V/50Hz交流电的电子装置比设计主要开关电源电路技术知识，采用二次逆变。运用TL494以及SG3525A等芯片,先12V直流电源升压为320V/50Hz的高频交流电，再经过整流滤波将高频交流电整流为高压直流电，然后采用正弦波脉冲调制法，通过输出脉冲控制开关管的导通。最后经过LC工频滤波及相应的输入输出保护电路后，输出稳定的准正弦波，供负载使用。12V/220V Car power inverter ABSTRACT Car inverter is an electronic device that can translate DC12V into AC 220V/50Hz,It is a common vehicle electronic equipment. Inverters are also used widely in daily life such as notebook computers, video recorders and some electric tools. This design is mainly based on switching power supply circuit technology and other basic knowledge, utilizing the second inverter to achieve the design need. Main idea is using TL494, SG3525A and other chips, firstly it translate the 12V/DC into high-frequency AC 320V/50kHz, then it is filtered by the high frequency alternating current into high direct voltage, Then it use the technology of sine pulse modulation to control the switch. Finally it output the stable quasi-sine signal to use in the load, which is through LC filter and the corresponding input and output protection circuit. This design is flexible and used widely in some applications. It can basically meet the practical needs. The design way uses high frequency inverter. It has some advantages such as the low noise, high reaction speed and flexible adjustment of the circuit. Overall the design is accord with the trends of development such as lightweight, high frequency and high reliability, etc. KEY WORDS power inverter pulse width modulated protection circuit sine wave 目 录 中文摘要 I 英文摘要 II 1 绪论 1 1.1 车载逆变器及其发展 1 1.2 逆变技术及其发展 1 2 设计总体目标 4 2.1 设计要求 4 2.2 总体方案的选取 4 3 整体电路设计 6 3.1 逆变电源整体框图 6 3.2 脉宽调制技术及其原理 8 3.2.1 脉宽调制技术 8 3.2.2 正弦波脉宽调制定义 8 3.3 正弦波脉宽调制技术的实现方法 9 3.3.1 软件生成法 9 3.3.2 硬件调制法 10 4 逆变电源元器件特性及各部分电路设计 11 4.1 逆变电源主要分立元件及其应用 11 4.1.1 场效应管 11 4.1.2 稳压管 11 4.1.3 与门 12 4.1.4 变压器 13 4.1.5 电流互感器 14 4.2 逆变电源主要集成芯片及其功能简介 15 4.2.1 TL494及其应用 15 4.2.2 SG3525A及其应用 16 4.2.3 ICL8038简介及其应用 19 4.2.4