program circuit
3.This paper describes the hardware design of a high speed intelligent communication interface circuit which can parallelly work with master computer, the intelligent communication principle and bottom communication program of the circuit. This circuit is appropriate for data communication and data collection in real time system with complicated control circumstance and high speed requirement.
8.Using the Digital Technology improves the performance traditional thyristor welding machine, according to the characters of the double inverse star from rectifier circuit, set the parameters with micro-controller accurately, design the dependable trigger circuit, lead the feedback of voltage for the operation program, so the voltage of main circuit be carried out very steadily.

