SA4828与AT89C52单片机单相变频电源的设计

菜单

摘要：介绍由单片机和SA4828研制的单相变频电源。提出了用高精度三相可编程PWM集成芯片SA4828与AT89C52单片机控制技术相结合的单相变频电源的设计方案。给出了系统总体构成和主电路设计，介绍了SPWM产生器和SA4828工作原理，SA4828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AT89C52和SPWM产生器SA4828组成系统控制器的软硬件设计。利用专用集成电路SA4828设计变频器可以大大简化硬件电路的设计和软件编程。它以SA4828作为SPWM信号发生器, 经过驱动电路控制IPM模块, 产生三相变频电源。配以单片机、键盘、L ED 显示器及转速编码器, 构成闭环调速系统。实验表明，由SA4828为控制芯片的变频电源结构简单、输出波形好、性能稳定可靠，适合于小功率的应用场合。65483

毕业论文关键词：正弦脉宽调制（SPWM）；SA4828；逆变电源；单片机

Abstract: the article introduces the MCU and SA4828 developed single phase inverter power supply. Put forward with a high precision programmable three-phase PWM integrated chip SA4828 and AT89C52 single chip microcomputer control technology with the combination of single phase inverter power supply design scheme. Gives the system's overall structure and main circuit design, this paper introduces the SPWM generator SA4828 and work principle of SA4828 full digital operation, flexible working, wide frequency range, high precision and strong function, it is possible to realize the intelligent design system. This paper introduces in detail using single-chip microcomputer AT89C52 and SPWM generator of SA4828 system controller hardware and software design. Using application-specific integrated circuit SA 4828 frequency converter, can greatly simplify the hardware circuit design and software programming. It SA4828 as SPWM signal generator, after driving circuit control IPM module, three-phase inverter power supply. With the single chip microcomputer, keyboard, L ED displays and speed encoder, constitute a closed-loop speed control system. Experiments show that by frequency conversion power supply for control chip SA4828 simple structure, good output waveform, performance is stable and reliable, suitable for low power applications.

Keywords: sine pulse width modulation (SPWM); SA4828; Inverter power supply. Single chip microcomputer

1 绪论 4

1.1变频电源应用背景及领域 4

1.2变频电源的研究现状及发展趋势 5

2变频电源系统结构 5

3 变频电源基本原理 6

3.1变换电路选择 6

3.2SPWM的原理 7

4 变频电源硬件电路设计 9

4.1主电路 10

4.2控制电路 12

4.3 驱动电路 14

4.4采样电路 15

4.5 保护电路 16

4.6显示电路 17

5 软件设计 19

6实验仿真分析 20

结论 21

参考文献 22

致谢 23

1 绪论

目前，变频电源大多采用正弦脉宽调制，即所谓SPWM技术。其控制电路大多采用模拟方法实现，电路比较复杂，有温漂现象，影响精度，限制了系统的性能，以80C196MC或TMS320F240为核心组成的控制电路，能实现电源的全数字化控制，但系统较复杂，软件工作量大，研制周期长。而MITEL公司生产的增强型SPWM波产生器SA4828，可与单片机连接，完成外围控制功能，使系统智能化。目前，变频电源大多采用正弦脉宽调制，即所谓SPWM技术。单片机只用很少的时间去控制它，因而有能力进行整个系统的检测、保护、控制、显示等。基于上述原因，控制电路采用SA4828和AT89C52。同时为消除输出滤波电感的噪音，将变压器和电感集成在一起，利用输出变压器的漏感与电容组成LC低通滤波器，不但消除了输出滤波电感产生的噪音，而且简化了主电路设计。