基于单片机单相交流过零检测及脉冲输出电路设计

The design of single-phase alternating current zero crossing detection and pulse output circuit based on single chip microcomputer

目前，可控硅做为大功率电子器件在工程中得到广泛应用，其触发方式在许多交流设备中都采用过零触发方式，而其控制多通过对触发脉冲的脉宽调节来实现。本文介绍一种由单片机控制的过零检测及脉冲输出电路。本设计包括硬件和软件设计两部分。硬件部分包括电源电路、过零检测电路、控制电路、脉冲波输出电路等部分组成。处理器采用51单片机，设计完成了过零检测，并能输出脉宽度从1ms～10ms某一种满足控制要求的脉冲波。

at present,thyristor as power electronic devices are widely used in engineering,the trigger mode in many communication equipment using zero crossing trigger mode,and its control by the pulse width trigger pulse conditioning to achieve.A microcomputer controled by the zero crossing detection and pulse output circuit is introduced in this paper.The design includes two parts of hardware and software design.The hardware includes the power circuit,the zero crossing detection circuit,control circuit,pulse output circuit.The processor uses 51single chip microcomputer,completed the design of zero crossing detection,and can output pulse width from 1ms to 10ms one to meet the control requirements of pulse wave.