SPWM法就是以该结论为理论基础，用脉冲宽度按正弦规律变化而和正弦波等效的PWM波形即SPWM波形控制逆变电路中开关器件的通断(The SPWM method is based on the conclusion. The PWM waveform, which is equivalent to sine wave, is changed by the pulse width according to the sine law, that is, the SPWM waveform controls the on-off of the switching device in the inverter circuit,)