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；冲量即窄脉冲的面积，所说的效果基本相同是指环节的输出波形基本相同。如果把各输入波形用傅里叶变换分析，则其低频段非常接近，仅在高频略有差异。面积等效原理是PWM控制技术的重要基础理论。
...面积等效原理；查表法 [gap=743]Key words：sine pulse width modulation；MSP430F148 single chip；area equivalence principle；table searching method ...
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介绍了一种基于面积等效原理，采用查表法产生正弦脉宽调制(SPWM)波的方法。
Introduction was made to the method of sine pulse width modulation (SPWM) wave generated by table searching, which is based on area equivalence principle.
在离心铸球工艺中，可应用有效重度和等效压头原理计算转速和内浇口断面积。
It is suggested to apply the principle of effective gravity and equivalent pressure head to calculate the rotational speed and ingate area in the processing of grinding ball by centrifugal casting.
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