Welding voltage electric current automatic regulating apparatus

The utility model provides a welding voltage electric current automatic regulating apparatus has all gone on protecting effectively to inputoutput interface, can protect inputoutput interface, also can get rid of outside strong jamming and crosstalk to the inside CPU the control unit of system through inputoutput interface, can weld voltage and welding current by automatically regulated, effectively improve the automatic level of welded, by receipt / the transmitting terminal SIG's of data communication circuit receiving and sending information, form the two -way asynchronous serial port communication structure of single data line. Owing to use single data line communication, reduce the wiring cost, the reduction factor causes the risk of trouble according to line contact failure simultaneously, that the data communication circuit uses all is the discrete devices who uses always, further reduces the cost of product. Whole circuit structure is simple, the reliability is high, with low costs, just can realize a