1.引言传统的弧压检测电路一般可分为下列二种类型: (1)弧压继电器利用继电器线包电阻与外接电阻的分压不同时,继电器所处的吸合与释放状态的不同以继电器触点上取出所需弧压信号,这种方式的检测回路与控制回路无电联系,但存在检测元件体积大、机械式触点可靠性不高,特别是继电器吸合或释放时间均在10ms左右,响应速度慢,无法满足新型电子焊机控制系统的动态响应要求。 1. Introduction Traditional arc voltage detection circuit generally can be divided into the following two types: (1) arc voltage relay using the relay line resistance and external resistors are not the same partial pressure, the relay in which the state of the pull and release to The relay contacts to remove the required arc voltage signal, the detection circuit in this way and the control circuit without electricity, but there is a large detection components, mechanical contact reliability is not high, especially the relay pull-in or release time About 10ms, the response speed is slow, can not meet the dynamic response requirements of the new electronic welding machine control system.