Design Of IGBT Inverter Welding Power Supply Module

With the development of power semiconductor technology, the application of power devices is getting more and more widespread, especially on the study of the inverter technology. Welding power source is a field of power electronics technology development in recent years. As a core component of the welder, inverter circuits which use IGBTs as switching devices is the main object of study. When compared with traditional welding power supply, the IGBT inverter welding power supply has a lot of advantages, not only light weight and small size, but also improving the quality of electricity and the efficiency of power when implement the power conversion by using IGBTs. After transition development of several generations of power devices, currently, IGBT inverter power has gradually become the main development direction of welding engineering applications.This paper presents a full-bridge inverter welding power supply module based on IGBT. The main contents include:1. Discuss the working principle and the structure of inverter welding system in detail and explain its inherent advantages in welding engineering applications. Meanwhile, make a detailed discussion and analysis on some main circuits of inverter welding power source, including topology, working principle, applications and so on. Also make a detailed description on the control principle of power swictching devices and compare their advantages and disadvantages for the main control method. Therefore, can provide strong theoretical basis for the detailed design of power supply.2. Design the main circuit and the auxiliary power supply circuit. The main circuit consists of the main loop circuit and the control circuit. On the one hand, select relevant control chips and components, and especially the switching devices in the main loop circuit, use the IGBT researched and developmented independently by Lab. On the other hand, make a detailed design and calculation on the parameters of the circuit, in order to ensure that the main circuit can transfer the energy from the input to the output safely and reliably. The purpose of designing the auxiliary power supply is to supply to the post-stage circuits.This circuit is the basis of the whole system.3. Build the actual circuit platform. Debug and verify its functionality. With hardware and software environment Lab provides, debug each module of actual circuits, including the separate debugging and the overall debugging of the main loop circuit, the control circuit and the auxiliary power supply circuit. The test results show that the designed welding power supply, its no-load voltage is about 70 V, which can ensure to strike an arc successfully and its short-circuit current is close to 200 A. Basically meet the requirements of the design. Also, revise some theoretical parameters during the debugging. In addition, analyze and discuss major failures when debugging, and give corresponding solutions.