基于FPGA的三相SPWM变频变压电源的研究  

Study of three-phase SPWM VVVF power supply based on FPGA

作　　者：徐彬 王传礼[1] 喻曹丰 解甜[1] XU Bin;WANG Chuanli;YU Caofeng;XIE Tian(School of Mechanical Engineering,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学机械工程学院

出　　处：《现代电子技术》2020年第2期9-13,共5页Modern Electronics Technique

基　　金：国家自然科学基金资助项目（51075001）;国家自然科学基金资助项目(51675003)

摘　　要：针对传统的变频变压电源采用的模拟控制技术的不足,设计一种基于FPGA的三相SPWM变频变压电源。对主要的硬件电路和基于FPGA的数字控制电路进行研究;分析SPWM波的调频调压原理;通过改变频率控制字来控制开关管生成频率可调的电压,调节调制度和PWM波的占空比来调节输出电压幅值。研究结果表明,系统实现了输出频率和幅值可调的三相正弦交流电,相位彼此相差为120°,输出电压幅值在0~25 V内可调,输出频率在0~100 Hz范围内以0.1 Hz的精度调节。仿真与实验结果证实了该设计方案的准确性和可行性。A three⁃phase SPWM VVVF power supply based on FPGA is designed to improve the shortcomings of the analog control technology used in the traditional VVVF power supply.The main hardware circuit and the digital control circuit based on FPGA are studied,and the principle of frequency modulation and voltage regulation of SPWM wave is analyzed.The switching tube is controlled by changing the frequency control word to generate the frequency adjustable voltage,the modulation degree and duty cycle of PWM wave are adjusted to regulate the output voltage amplitude.The research results show that the system can realize three⁃phase sinusoidal AC with adjustable output frequency and amplitude.The phase difference is 120°,the output voltage amplitude is adjustable within 0~25 V,and the output frequency is adjustable within 0.1 Hz in the range of 0~100 Hz.The simulation and experimental results verify the accuracy and feasibility of this design scheme.

关 键 词：变频变压电源 三相SPWM FPGA 逆变电路 频率控制字 调制度 占空比 

分 类 号：TN773-34[电子电信—电路与系统] TM921[电气工程—电力电子与电力传动]