Research On Digital Inverted Dc Welding Source System Based On FPGA

The welding power source is the tool that through some technical method converts the power to control thermal energy in the industry. In the field of welding power source, for example, the volume of power supply、power consumption and the control precision, and so on, the traditional welding power source have been eliminated, because its own architecture and technical problems. Instead, the digital welding power source what is quick dynamic response of the output control, high power factor and stable out of waveform.This topic research of digital welding power source is based on the secondary control, the power systems using FPGA (Field Programmable Gate Array) as the main control chip, and completing each module of system’s drive、control、sampling and miscellaneous protection design. The digital welding power source control system is a complex system with multiple parameters influence. It provides the energy for welding, so the electrical properties will directly affect the burning stability and welding quality. Designed the level before the inverter machine, at the same time, on the basis of the design after the level control circuit, chose UCC28061 as PFC (Power Factor Correction) circuit of the main controller, Power Factor Correction circuit system is designed, the back-end of steady energy, achieving high quality green welding Power source, secondary control mode is given priority to with FPGA controller was designed based on digital inverter welding Power source system, compare waveform in traditional way, the innovative design the specific current waveform in a given module, realized controllable waveform. Aimed at this system chooses the appropriate accused of components and the corresponding control mode, such main purpose is to realize the welding process control and the rapid response of the demand for output, the output voltage, current rapid adjustment. At the same time, the establishment of a complete intelligent control system of the welding power, the relevant variables such as welding current, welding voltage, on the basis of application of the intelligent degree and fuzzy control algorithm has better real-time performance, using the design of the intelligent control algorithm to correct the data, which ultimately determine the optimal control parameters, on professional welding platform has carried on the actual experiment.In the last, the experiment is carried of the power; test the power supply work in various waveforms. The experimental results showed that the design of the digital welding power source meet the testing standard. Through detailed analysis of the wave, grasping the waveform control law, and more deepen research the power system, making the system stable and reliable performance.