system for welding power source

 

 

LI Wei1,2, QI Bojin1*, CONG Baoqiang1, YANG Mingxuan1

 

(1. School of Mechanical Engineering and Automation, Beihang University , Beijing 100191, China;

 

2. Department of Electrical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China)

 

 

Abstract: Aiming at the problem of simple function and inconvenient operation in the humanmachine interaction system of ultrasonic frequency pulse squarewave TIG welding power, the digital humanmachine interaction system based on Microprocessor and RS485 bus technology was developed. The 16bit high performance Microprocessor named PIC24FJ256GB106 was used as the core controller, and the touchpad supporting MODBUS protocol was used to realize interaction function in the system. The interface circuit between microprocessor and touchpad was designed by using Max485 and optical coupler, the software design of MODBUS RTU transport mode was realized by using C language in the integrated development environment named MPLAB, and HMI interface was developed by Easy Builder8000 configuration software. The results indicate that the interaction system is convenient for setting and adjusting parameters, and can realtime monitor status parameters during welding process. The system has the merit of reliable and can meet the need of automotive welding.

 

Key words: PIC24FJ256GB106; touchpad; humanmachine interaction; serial communication