In order to solve the problem that The Natural Sampling Method is greatly complex ,The Regular Sampling Method has less computational complexity than The Natural Sampling Method ,but it is still existing problems of error ,so an algorithm based on area equivalent method to realize SPWM waveform is proposed .Area equivalent method the principle is the pulse of equal and different shapes of narrow pulse added to the inertial link output waveform is basically effect .A cycle of the modulated wave is divided into a number of equal portions ,and the equally divided areas are replaced by narrow pulses of equal area .Through the look-up table method to constantly change the duty cycle to achieve SPWM waveform .It is simple and effective by this method to generate the SPWM signal ,and the program is easy to implement .%针对自然采样法计算量大,规则采样法相比自然采样法计算量小,但仍存在一定误差等问题,提出了一种以STM32为核心基于面积等效法实现SPWM波形的算法.面积等效法其原理是脉冲相等而形状不同的窄脉冲加在惯性环节上输出波形基本相同.将调制波的一个周期划分为若干等分,该等分的面积用等面积的窄脉冲代替,用面积等效法精确计算出每一个窄脉冲的开关通断时间,通过查表法不断地改变占空比实现SPWM波形.该方法产生的SPWM信号简单有效,程序易实现.
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