基于DSP2812的双频率SPWM波的设计

Design of Dual Frequency SPWM Wave Based on the DSP2812

以高性能数字信号处理芯片TMS320F2812为核心,设计生成了基于对称规则采样算法的SPWM波形,通过DSP的TOP2812开发板上的两个按键来产生两个不同频率的SPWM波。首先分析了对称规则采样法原理,接着设计了基于TMS320F2812芯片的软件设计流程,并简单设计了一个滤波器来测量SPWM波的频率,最后在示波器上分别显示了SPWM波、死区时间波形以及通过滤波器后的正弦波。实验结果表明,通过开发板上的按键可以很好地控制双频率SPWM波的产生。

Using the high performance digital signal processing chip TMS320F2812 as the core, the SPWM wave based on the method of symmetric regular sampling was produced through controlling the two buttons on the DSP TOP2812 developing board to produce two different frequency of SPWM wave. Firstly, the method of symmetric segular sampling was analyzed, then the software flow charts based on TMS320F2812 and a simple filter to measure SPWM wave frequency was designed. Finally, the oscilloscope respectively showed the SPWM wave, dead-time waveform and the sine wave processed by filter. Experiments showed that the two button on the DSP developing board can be a very good control the production of double frequency SPWM wave.