1 概述众所周知,电机的转速和电源的频率是线性关系。变频器就是利用这一原理将50Hz 的市电通过整流和逆变转换为频率可调的电源。由于变频器是通过 CPU 产生6组脉宽可调的 SPWM 波控制三相的6组功率元件导通/关断,从而形成电压、频率可调的三相输出电压。其输出电压和输出电流是由SPWM 波和三角载波的交点产生的,不是标准的正弦波,包含较强的高次谐波成分,对电网上的其他 1 Overview As we all know, the motor speed and frequency of the power is a linear relationship. Inverter is the use of this principle will be 50Hz mains through the rectifier and inverter into a frequency adjustable power supply. As the inverter generates six groups of power components of three phases controlled by the SPWM wave with adjustable pulse width, the CPU turns on / off, so as to form a three-phase voltage with adjustable output voltage and frequency. The output voltage and output current are generated by the intersection of the SPWM wave and the triangular carrier, which is not a standard sine wave and contains strong higher harmonic components.