1、 I 摘摘 要要 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,是常用的车用电子用品。在日常生活中逆变器的应用也很广泛,比如笔记本 电脑、录像机和一些电动工具等。 本设计主要基于开关电源电路技术等基础知识, 采用二次逆变实现逆变器的 设计。主要思路是:运用 TL494 以及 SG3525A 等芯片,先将 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。 本设计具
2、有灵活方便、适用范围广的特点,基本能够满足实践需求。而且本 设计采用高频逆变方式, 具有噪声降低、 反应速度提高以及电路调整灵活的优点。 设计符合逆变电源小型化、轻量化、高频化以及高可靠性、低噪声的发展趋势。 关键词 车载逆变器 脉冲调宽 保护电路 正弦波 TL494 SG3525A II Abstract 12V DC car inverter can the car into 220V/50Hz AC electronic devices, commonly used in car electronic equipment. Inverter application in daily li
3、fe is very broad, such as laptop computers, video recorders, and some electric tools. This design is mainly based on the basic knowledge of the switching power supply circuit technology, the design of the second inverter to inverter. The main idea is: the use of TL494 and SG3525A, chip, first 12V DC
4、 power boost for 320V/50Hz high frequency alternating current, and then through the rectifier filter high frequency alternating current rectifier for high voltage direct current, and then using a sine wave pulse modulation method, through the output pulse control switch is turned on. Finally, after the LC working frequency filtering and the corresponding input and output protection circuits, the output stability of the quasi-sine wave for the load using the. This design has a flexible, applicabl