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文章介绍了一种单片机控制的净化型交流稳压电源，单片机采用Ｍｉｃｒｏｃｈｉｐ公司的ＰＩＣ１６Ｃ７１，结合运放及光耦晶闸管等电路，组成电压有效值检测电路，用软件实现对过零点的准确判断，使系统稳定性大为提高。
This paper introduces a kind of purifying AC regulated power supply controlled by SCM. Microcontroller adopts PIC16C71 from Microchip Company. Combined with op amp and optocoupler thyristor and other circuits, a voltage rms detection circuit is formed. By software, the accurate judgment of zero crossing is made. System stability is greatly improved.