正弦脉宽调制(SPWM)技术的探讨

Discussion on SPWM Technique

随着我国工业化进程和电子技术的飞速发展,变频调速系统逐步涉及到人们生活的方方面面。实现变频调速的关键是产生实时可控的电源频率输出,也就是变频电源。由于正弦脉宽调制(SPWM)的脉冲宽度占空比随时间呈正弦规律变化、所以输出波形经处理后可近似成正弦波输出。通过实时控制输出正弦波的频率就可以达到变频的目的。本文首先介绍了正弦脉宽调制(SPWM)的产生原理、调制方式、限制条件以及系统实现方法,最后对其调制方式和系统实现方法进行比较并得出了结论。

With the rapid development of China＇s industrialization and electronic technology, variable frequency speed regulation system is gradually involved in all aspects of people＇s lives.The key to realize variable frequency regulation is to produce real-time controllable power supply frequency output, that is, frequency conversion power supply.Because the duty cycle of SPWM varies sinusoidal with time, the output waveform can be approximated to sinusoidal wave after the processing.The purpose of frequency conversion can be achieved by controlling the frequency of sinusoidal wave in real time.In this paper, the principle of SPWM, modulation method, restriction condition and system realization method are introduced at first.Finally, the modulation mode and system realization method are compared and a conclusion is drawn.