Study And Design On Digital Welding Power Source Based On DSP+MCU

The new industrialization wave promotes the rapid development of advanced manufacturing and requires a higher welding technology. High quality and efficiency welding needs high level of welding power source.With the development of information and intelligence, digital controlled welding power technology has become a frontier and hot topic in the field of scientific research.Digital welding power source represent the development of welding power in the future.One of important points of this research is to perfect the digital welding power system and make full use of its advantage. By comparing the structure and function of control unit, a digital welding power source system with two control core, which can be used for several welding methods, is developed. It takes the advantage of the strong calculation signal procession ability of DSP and the perfect multitask management and process control of MCU. The former is in charge of sampling and analyzing the high frequency signal, and also the real-time control; the main assignment of the latter is man-machine interactive system, peripheral communication and the sequence control.This paper include not only the completion of the IGBT inverter main circuit, DSP (TMS320LF2407A) and MCU (80C196KC) minimum system and the external circuit, wire feeder circuit, and other hardware circuit design, but also the software design of a number of PID control algorithms, HCI Systems, communications interface. In order to improve the accuracy and stability of power supply, a series of hardware and software design are still in the paper as anti-jamming method. In order to enhance the reliability of control system, it takes dual-port RAM (random access memory) as communication way between the DSP and MCU in this subject. In order to facilitate software upgrading, it takes RS232 serial communication between MCU and PC.The issue also did a more in-depth study in digital extension functions of digital welding power. In the view of that the current welding power can't do network, can't satisfy the information requirements of the current manufacturing, this dissertation complete innovative design. The embedded network interface for digital welding power based on the Ethernet controller chip RTL8019AS can be directly linked into the LAN and the Internet. In view of the external equipment control of the current welding power source is poor and less related interfaces could be used, which can't satisfiecd automated production,a common external equipment control interface based on the A/D chip TLC5615 is developed.The simulation experiment studies of control system show that the digital control system for welding power can achieve real-time, rapid and accurate control. This digital welding power controller could provide a platform for the future research.