Optimal Design Of Digital Welding Machine Control System

With the developments of welding technique, control technology and information technology, the digital welding machine system is very popular to be researched. So, in this paper, the optimal design of the control system in digital IGBT inverter welding machine is studied. In the system of digital welding machine, IGBT full-bridge inverter structure is adopted in main circuits, and DSP (TMS320F2808) is adopted as the core of control system. DSP achieves the collection of real-time welding parameters, PI calculation and PWM generation, to control the on-off of IGBT, so, forms a closed-loop control system, and greatly simplifies the hardware of the power control circuit. The modular programs design method was adopted in the software design of the control system. On the base of the master program flow is planned, the whole program is divided into several simple and specific subprograms. Therefore, the software design of system is greatly simplified, and the program structure is clear and understandable.In the digital wire feeder system, MOSFET is used to drive the wire feeding motor, and DSP is used to complete the control of wire feeding motor speed feedback, PI calculation and the generation of PWM waveform。The speed negative feedback is adopted to achieve the closed-loop control of wire feed. Finally, the all-digital wire feeding system is implemented in this study. In the control system, The software and hardware of each functional module is debugged.The result of debugging shows the control system is greatly optimized, the system responses quickly, the circuit is simplified, the system software highly actives and has better portability, the wire feeding system has good static and dynamic performance. The requirements of this design are reached.