漳州师范学院漳州师范学院毕业论文（设计）基于 PIC 单片机单相 SPWM逆变电源的设计The Design of Inverter Basing on PIC Microcontroller Single-phase SPWM 姓 名： 林小章 学 号： 080502230 系 别： 物理与电子信息工程系 专 业： 电子信息科学与技术 年 级： 2008 级 指导教师： 黄成老师 2011 年 12 月 31 日I摘要本系统以单片机PIC16F877A为控制核心的单相全桥式电压型SPWM逆变电源。系统主要由交流220V变压隔离成可调交流电，再整流变换成直流电，SPWM信号通过光耦隔离器控制由开关管MOEFET组成的逆变器件的工作状态，实现对输出的控制，即AC-DC-AC变换。从而得到频率和幅度都可调的正弦交流电，后端再对电压、电流以及频率的采样，从而实现闭环的控制。该逆变电源输出的正弦交流电精度高，性能稳定，实用价值高，在电力电子技术中应用广泛。关键词：SPWM；逆变器；驱动电路；场效应管 IRF840AbstractThis system is a single-phase full-bridge voltage-type inverter which is based on PIC16F877A microcontroller. It is mainly transformed from 220V AC to adjustable AC, then rectifies to DC. Signal SPWM controls the working status of the inverter device which consists of switch MOEFET through the photon coupled isolator. And this procedure achieves the control of the output. That is the AC-DC-AC conversion. Consequently, the sinusoidal alternating current whose frequency and amplitude are both adjustable comes into being. Later, the samples of voltage, current, and frequency are taken in order to control the closed-loop. The sinusoidal alternating current from this inverter is in possession of high accuracy, stable performance, and high practical utility. Thus, it is widely applied to power electronic technology.Key words: SPWM; inverter Driving; circuit；the field effect manage IRF840II目录摘要 .IABSTRACT .I1. 引言.12. 系统设计.12.1 设计要求及思路.1 2.2 PWM 技术基础.3 2.3 逆变电路的基本工作原理.63.硬件设计.73.1 单片机电路设计.7 3.2 主电路设计.8 3.3 驱动电路设计.9 3.4 自举电路设计.10 3.5 辅助电源电路设计.10 3.6 死区电路设计.11 3.7 硬软件保护电路设计.11 3.8 检测电路设计.12 3.9 显示电路设计.13 3.10 电源电路设计.144软件设计.144.1 主程序设计.15 4.2 PIC 单片机设置.15 4.3 SPWM 信号的产生过程.16 4.5 程序清单（见附录）.175 软硬件调试.175.1 SPWM 信号调试.17 5.2 检测信号调试.176 测试结果.187结束语.18致谢.19参考文献：.20附录.