三相正弦波变频电源

摘要

本系统是一个交流-直流-交流变频电源。系统以FPGA为控制核心，采用SPWM变频控制技术，实现三相正弦波变频输出。输出线电压有效值为36V，最大输出电流有效值达3A。系统还具有频率测量，电流、电压有效值测量，平均功率测量功能。基于单片机智能化和开关电源高效率的特点,研制出一种以XC164单片机作为核心控制模块的三相正弦波变频电源。本系统同时采用电压反馈电路和电流反馈电路，分别将输出电压和电流反馈至XC164单片机，然后该单片机利用其内部的模数转换器对反馈电压和电流进行A/D转换，同时单片机根据计算出的电压有效值对输出电压进行宏观PID控制，以实现稳幅。采用了实时电压跟踪SPWM技术,使单片机在变频电源系统中得到了有效的应用。实验结果表明该系统具有良好的稳压性能和很小的波形失真,并且能够进行自检测、过流、过压、过热和短路保护等功能。

关键词: 三相 SPWM 逆变变频电源

Abstract

The system, based on FPGA, is a AC-DC-AC variable frequency power supply. The technology of SPWM frequency converting control is applied to get the output of three-phase variable frequency sine wave. The real line voltage is 36V and the maximum current（real value）output is up to 3A. The system also includes the following functions like frequency metering, measurements of real voltage and current, and the measurement of the average power. This system adopted voltage feedback circuit and current feedback circuit, output voltage and current respectively XC164 microcontroller, then the feedback to the microcontroller use its internal adc voltage and current of feedback on A/D conversion, and SCM according to calculate the RMS voltage output voltage of the macro PID control, in order to achieve steady picture. Adopted real-time voltage tracking SPWM technology, make SCM in frequency conversion power system got effective application. The experimental results show that the system has good performance and small voltage waveform distortion, and can be carried out since detection, over-current, over-voltage, overheating and short circuit protection function.

Key Word:three phase SPWM invert frequency power

目录

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1.0变频器的概述 (1)

1. 1三相异步电动机的工作原理 (1)

1. 2.变频器的工作原理 (1)

1.3变频器控制方式 (1)

1.4正弦波脉宽调制方式 (4)

1.5 SPWM调制方式的选择 (5)

1.6电压电流频率的测量 (6)

2系统总体设计方案和实现框图 (7)

2.1系统总体设计方案 (7)

2.2 实现框图 (7)

3 理论分析与参数计算 (7)

3.1 主回路电参数计算 (8)

3.2 SPWM逆变电源的谐波分析 (8)

3.3 载波频率的选择 (8)

3.4 FPGA内单相平均功率计算算法 (9)

4 主要功能电路设计 (9)

4.1 整流电路 (9)

4.2 光耦隔离驱动电路 (10)

4.3 逆变电路 (10)

4.4 无源滤波电路 (11)

4.5 测频整形电路 (11)

4.6 电流电压测量电路 (12)

4.7 MAX197采样电路 (13)

4.8 FPGA模块 (13)

5 系统软件设计 (15)

6 系统测试与分析 (16)

7 总结分析与结论 (18)

7.1 系统总体性能 (18)

7.2 系统注意点与分析 (18)

结束语 (19)