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很多小型点焊机的焊接时间固定为20mS(即一个周波(50Hz)的时间),不可调节.这样对使用范围有些限制.本文介绍—种主要以CMOS器件组成的周波数控制电路,用它代替一般小型点焊机控制电路,可达到在1～99个周波内任选的效果,实际使用中,大都在10周波内调节就可以了.电路原理系统采用开环控制.将交流220V电源电压取样、整形后作为计数脉冲和可控硅触发信号.这样,控制信号和主回路波形同步简单.如图所示,主回路由开关K、焊接开关G,可控硅S,焊接变压器W组成.交流220V电压经开关K引入.
Many small spot welder welding time is fixed at 20mS (ie, a cycle (50Hz) of the time), can not be adjusted.There are some restrictions on the use of.This article describes a kind of mainly composed of the number of weeks CMOS control circuit, instead of using it Small spot welding control circuit can be achieved within 1 to 99 weeks the optional effect, the actual use, mostly in 10 weeks to adjust on the circuit principle of the system using open-loop control will be AC 220V power supply voltage sampling, Shaped as a count pulse and SCR trigger signal so that the control signal and the main loop waveform synchronization is simple as shown in the figure, the main circuit by the switch K, welding switch G, SCR S, welding transformer W. AC 220V The voltage is introduced via switch K.