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普通交流点焊机,其电流大小由变压器级数调节,通电时间由人工操纵接触开关控制,难以保证焊接质量。下面介绍一种简单实用的时间控制器,可用于75千瓦以下的交流点焊机焊接时间控制。图示为控制电路原理图,它由电源、延时电路、执行电路组成。电源电路为串联型稳压电路,输出12伏的工作电压。延时电路由单结晶体管BJ、电阻R和电容C组成。通电后,在C两端得到锯齿波电压,在电阻R_2
Ordinary AC spot welder, the current size of the transformer series by adjusting the power supply time by the manual control of contact switch control, it is difficult to ensure the welding quality. The following describes a simple and practical time controller can be used for AC spot welding time control of 75 kilowatts. Schematic diagram for the control circuit, which consists of power supply, delay circuit, the implementation of the circuit. Power supply circuit for the series regulator circuit, the output voltage of 12 volts. Delay circuit consists of a single junction transistor BJ, resistor R and capacitor C composition. After the power is applied, a sawtooth voltage is applied across C and across resistor R_2