基于TMS320F28335的三相SPWM变频技术研究

The Research of Three-phase SPWM Frequency-converting Techniques Based on TMS320F28335

正弦脉宽调制(SPWM)技术是一种适用于大功率电力开关变换装置的高性能开关调制策略,在变频调速系统中应用很广泛。TMS320F28335具有强大的数据处理能力,其EPWM模块非常适于产生SPWM波形。本文介绍了一种基于28335的三相SPWM变压变频调速系统,给出了硬件电路与程序流程,系统可扩展性强。该方法采用对称规则采样算法,计算量小,实时性高。通过CCS V5/simulator仿真表明,该方法实现了三相SPWM的有效输出。

SPWM technique is a suitable power switch conversion device for high-power high-performance switching modulation strategy, which is commonly used in variable frequency speed adjusting system. TMS320F28335 has strong ability in data processing, and the Envelope Pulse-Width Modulation （EPWM） module is very suitable for generating three-phase SPWM wave. The method of how to take advantage of TMS320F28335 to generate three-phase SPWM wave used in variable frequency speed adjusting system was described, and the hardware circuit and process flow were given, and the system has good expansibility. The method using symmetry regular-sampling has the characteristics of less calculation and strong real-time capability. The software emulating result based on CCS V5/simulator shows the output waveforms of three-phase SPWM correspond to these of the theory.