Switching time point precision comparison and harmonic analysis of SPWM

Based on the sinusoidal pulse width modulation technology and regular sampling method, the switching time points calculation formulas of tangent method and secant method are established. This paper analyses the precision of switching turn-on and turn-off time point, and compare these switching time points. Calculation results show that SPWM pulses generated by tangent method and secant method are closest to the pulse generated by natural sampling, the THD is also smaller than by regular sampling.