采样控制理论中有一个重要结论:冲量相等而形状不同的窄脉冲加在具有惯性的环节上时,其效果基本相同.PWM控制技术就是以该结论为理论基础,对半导体开关器件的导通和关断进行控制,使输出端得到一系列幅值相等而宽度不相等的脉冲,用这些脉冲来代替正弦波或其他所需要的波形.按一定的规则对各脉冲的宽度进行调制,既可改变逆变电路输出电压的大小,也可改变输出频率.-Sampling control theory has an important conclusion: the impulse is equal but different shapes of narrow pulses added to the inertia of the link, the effect is basically the same. PWM control technique is to this conclusion based on the theory of the semiconductor switching device on and off to control the output side by a series of equal amplitude and pulse width are not equal, with these pulses instead of sine wave or other needs. according to certain rules of the pulse width modulation, can change The size of inverter output voltage can also change the output frequency.