Design and Optimization of Three Phase SPWM Based on FPGA

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.