基于TMS320F2812的多任务SPWM设计方法

Software Design of Asymmetry Rule Sampling Algorithmic of Multitasking based on TMS320F2812

介绍了一种基于多任务不对称规则采样的SPWM波形生成方法。利用高性能TMS320F2812型DSP中EVA事件管理器的周期中断和下溢中断产生脉宽调制波。在编制程序时根据各任务功能及其重要性设置不同的任务级别和不同的循环执行时间。将这种多中断、多任务SPWM编程设计方法应用在输出功率5kW的变频电源上,通过对电源输出电压的频谱分析可知,多中断不对称规则采样法实现的SPWM输出波形优于对称规则采样法。

This paper introduces the method of generating SPWM wave according to asymmetric regular sampling method with multi-tasks.Using the period and overflow interrupts of the event manager based on DSP TMS320F2812 to generat the pulse width modulation wave.According to the function and importance of the tasks,different priority and cycle execution time druring the programming are set.Appliying the programming method with multi-interrupters and multi-tasks to the 5 kW power of the frequency conversion power supply, the spectrum analysis with the output-voltage show that the multi-interrupters asymmetric sampling method is better than the symmetry rules.