The Develop Of Control System In Invertering Spot Welding Power Supply

Spot welding has been used in many industry fields such as aviation, spaceflight,atomic energy, electron technology and automobile etc. On abroad, the mid-invertspot welding servo-robot has been used by the motor manufactory (U.S.A. and J.P)in Automatic production line. There are around 4000~6000 spots in a body of car,The more use of welding servo-robot the higher the automatization level is.Generally we most use welding power supply which is between50KVA~75KVA .This need the power supply smart and light .With the rapiddevelopment of economic we need more and more supply, but, we also have lots ofproblems to solve compared to the abroad welding supply. The most importantproblemisminiaturization.Weneedmoreandmorefinishedproducts.Inthispaper,aimingat thelowprecision,poorreal-timeandcomplicatedcircuitof the traditional spot welding controller ,a precision control to the implementationof welding current, welding mode ,welding time with high speed and high precisionis introduced through software program and reasonable simple but reliable hardwarecircuit.The present condition and trend of the spot weldingtechnologyis analyzed firstlyin this article. The construction of modern inverting spot welding power is analyzedand the whole frame of this inverting welding power equipment is defined. Acentre-controlsystemofspotweldingpowersupplyisdeveloped.Thesystemcanbedivided into the single chip controlled inverting spot welding power andman-machine interactive system. The two parts adapt smartly and appropriately bythe software and the hardware. On one hand, centre circuit controlled by the singlechip can give welding current and welding time according to the requirement.Consequently, the output of welding power can be controlled logically. On the otherhand, the panel display and control is implemented. The parameters can be adjustedconvenientlybythepanelcontrol.In the inverting welding power supply part, the center control circuit with theADuC812 single chip as the core, exterior interface circuit of the single chip and theman-machine interface circuit are designed. The ideology of software developing,the main program, and other function program and the system's anti interferencemeasure are introduced systematically. We use modularized programmer software inthe system. At last, debug the keyboard, LED display, I/O port and A/D port ofcurrent. The control system we have designed has simple structure, operating fast, canmeet the need of the inverter-based resistance spot welder, and has such function asparameter setting up, parameter showing etc, capable of the multi parameter andinformation sampling and processing of the spot welding, has some theory andpractical value of the realization of the inverter-based resistance spot qualityintelligentcontrol.