文档介绍：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
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IRF840
Abstract
This 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 es 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 IRF840
目录
摘要 I
ABSTRACT I
1. 引言 1
2. 系统设计 1
1
PWM 技术基础 3
6
7
7
8
9
10
10
11
11
12
13
14
4 软件设计 14
主程序设计 15
PIC单片机设置 15
SPWM 信号的产生过程 16
(见附录) 17
5 软硬件调试 17
SPWM信号调试 17
检测信号调试 17
6测试结果 18
18
致谢 19
参考文献: 20
附录 21
附录1 元器件清单 21
附录2电路原理图 22
附录3电路PCB 23
附录4程序清单 24
1. 引言
电能变换的类型有四种:(1)DC-DC变换器,它是将一种直流电能变换为另一种直流电能的变换器;(2)DC-AC变换器,它是将直流电能变换为交流电能的变换器,这种变流装置称为逆变器;(3)AC-DC变换器,它是将交流电能变换为直流电能的变换器;(4)AC-AC变换器,它是将一种交流电能变换为另一种电能的变换器。
在逆变器示出现以前,DC-AC变换是通过直流电动机-交流发电机组来实现的,这种组合称为旋转交流机。随着电力电子技术的高速发展,大功率开关器件和集成控制电路的研发成功,利用半导体技术就可以完成DC-AC变换,这