基于微控制器的晶闸管相序自适应电路设计

为保证三相桥式相控整流器的正常运行,同步电压与主回路电压的相序、相位必须匹配。本文通过研究晶闸管数字触发器的工作原理提出了一种利用线电压与相电压之间的相位关系通过TPL-521光耦,由单片机程序实现对电源相序和缺相的判断进而实现相序的自适应的方法。本装置不使用变压器或电压互感器而是直接从电源线接入,采集到的线电压过零点正好是相电压的自然换相点,容易实现控制角度与时间之间对应关系的计算。

Phase Sequence Self-adaption Circuit Design for SCR Based on MCU

To ensure the normal operation of phase-controlled rectifier of Three-phase bridge,synchronous voltage must match with phase sequence phase of main circuit voltage.In this paper,after studying the Principle of thyristor trigger,propose to use the phase relationship of the line voltage and phase voltage through the TPL-521 optocoupler and the MCU program judging the power phase sequence and detecting to realize the lack of phase of the adaptive method.And compared to other existing adaptive phase sequence ci...