基于单片机控制的三相逆变电源

摘要

逆变电源是一种采用电力电子技术进行电能变换的装置，它从交流或直流输入获得的交流输出。随着电力电子技术的发展，逆变电源的应用越来越广泛，它横跨电力、电子、微处理器及自动控制等多学科领域，是目前电力电子产业和科研的热点之一。与此同时应用系统对逆变电源的输出电压波形特性也随之提出了越来越高的要求，因为电源的输出波形质量直接关系到整个系统的安全和可靠性指标。

随着数字信号处理技术的发展，以SPWM控制方式设计的逆变电源越来越受到青睐。本论文叙述的就是一种基于51系列单片机设计的SPWM逆变电源。给出了系统总体构成和主电路设计，介绍了SPWM产生器SA8282的结构特性和工作原理，SA8282全数字操作、工作方式灵活、频率范围宽、精度高功能强，可实现系统的智能化设计。文中详细介绍了采用单片机8051和SPWM产生器SA8282组成系统控制器的软硬件设计，实现了逆变电源输出电压闭环控制。实验表明，由SA8282为控制芯片的逆变电源结构简单、输出波形好、性能稳定可靠，适合于中、小功率的应用场合。

关键词：正弦脉宽调制（SPWM）；SA8282；逆变电源；单片机

Abstract

Inverter is a kind of using power electronic technology for electric power transformation device, it from ac or dc Input voltage of exchange obtained constant frequency output. With the development of the power electronic technology, the application of inverter power supply is more and more extensive, it across the electric power, electron, microprocessor and automatic control multi-disciplinary field, is one of the hotspots of the power electronics industry and scientific research. Meanwhile application system subsequently put the output voltage waveform characteristics of inverter power supply forward more and higher demand, because the power output waveform quality directly relates to the whole system safety and reliability index.

Along with the digital signal processing technology development, the control mode design with SPWM inverter power supply more and more be favored，This article describes a SPWM inverter power supply based on the 51 series microcontroller，The three phase inverter of full digital control based on MCU 8051 and SPWM generator IC SA8282 is introduced in this paper，the system construction and main circuit design of inverter are given, the function feature and operation principle of SPWM generation IC SA8282 is described. the hardware and software design of controller implemented closed-loop of voltage by using AT89C51 and SA8282 is discussed in detail，experimental results shown the three phase output voltage waveform is quit good，the performance meets the demand.

Keywords:SPWM；SA8282；inverter power supply；MCU

目录

摘要................................................................... I Abstract ............................................................... II 1 绪论 (1)

1.1 课题的背景 (1)

1.2 电源技术发展的概况 (2)

2 总体方案设计 (4)

2.1 SPWM原理 (4)

2.2系统总体方案 (4)

3 系统硬件设计 (6)

3.1 系统主电路设计 (6)

3.1.1 输入EMI滤波器的设计 (6)

3.1.2 输入整流滤波电路设计 (6)

3.1.3逆变器的设计 (7)

3.2 采样电路及A/D转换电路 (8)

3.2.1 采样电路 (8)

3.2.2 8051单片机引脚及其功能介绍 (9)

3.2.3 8051单片机内存扩展 (10)

3.2.4 A/D转换电路 (11)

3.3 SPWM波产生芯片SA8282及应用 (13)

3.3.1 SA8282工作原理 (13)

3.3.2 SA8282与单片机的连接 (16)

3.4 IGBT驱动电路的设计 (17)

3.4.1 IGBT驱动电路的要求 (17)

3.4.2集成化IGBT专用驱动器EXB841 (18)

3.5 MCS-51对LED/键盘的接口 (20)

3.5.1 LED数码显示管显示原理 (20)

3.5.2 键盘/显示系统 (21)

3.6系统保护电路设计 (21)

4 系统软件设计 (25)

4.1 键盘/显示系统主程序设计 (25)

4.2系统控制程序设计 (25)

4.3软件抗干扰技术 (27)

结论 (29)

致谢 (30)

参考文献 (31)

附录 (32)