基于AWC算法的随机周期PWM实现方法研究

Implementation Method Research of Randomized Period PWM Using AWC Algorithm

提出了一种基于AWC算法的随机周期PWM方法,并着重讨论了采用C8051F单片机实现方案。该方法完全利用单片机内部资源,不需外部辅助电路,是一种完全借助软件的随机PWM技术。将其应用于DC/DC和DC/AC变换电路中大大简化电路设计。实验结果表明,经该方法随机调制的PWM信号将集中在开关频率及其倍频处的能量尖峰拓展到更宽的频带上,功率谱特性呈连续分布,大大降低开关器件的电磁干扰。

A new randomized period PWM method based on AWC algorithm is proposed,and its implementation scheme using C8051 F microcontroller is discussed particularly.The method only uses microcontroller internal resources completely,and it does not need external auxiliary circuit,so it is a kind of completely random PWM technique with the help of software.DC/DC and DC/AC conversion circuit design is greatly simplified by using this method.Experimental results show that PWM signal randomly modulated by the method modifies the power of the fundamental harmonics onto frequency sideband and power spectral characteristics are continuous distribution,which greatly reduces the electromagnetic interference of switching devices.