基于FPGA的三相SPWM的设计及其优化

Design and Optimization of Three Phase SPWM Based on FPGA

简要介绍了 SPWM的产生方法 ,重点对产生 SPWM的正弦表及其运算电路进行优化。利用分时复用以及正弦波的对称性 ,使得三相正弦波只需一个 1/4周期的正弦表即可实现 ,把所需的正弦表减少到原来的 1/12 ,并且不会对三相正弦波的精度产生影响 ,极大的减少了所需 F PGA的门数。并通过了 MAXPL US 的仿真验证 。

A way to generate SPWM is simply introduced in the paper, and the emphasis is stressed on the optimization of sine table and its operation circuit. With timesharing method and the symmetry of sine wave, the sine table needed to generate three phase sine wave is only a quarter of sine period, that is, the table needed is reduced to one twelfth of the table before. So the gates needed of FPGA are decreased greatly. Besides, the optimization will have no any effect on precision of the three phase sine wave, and has been simulated successfully through MAXPLUS Ⅱ, with the satisfactory results.