Interleaved Parallel Two-Transistor Forward Converters for Pulsed MIG Welding

[摘要] In this paper, a pulsed MIG welding power system based on the interleaved paraller two-transistor forward converter is studied. The hardware structure principle diagram and overall control scheme of the system are analyzed. This paper focuses on the analysis of the small-signal model of the main circuit, and establishes the transfer function of the arc-length loop and the current loop respectively, and designs a double closed-loop controller. Experiments were carried out according to the paper's scheme. The experimental waveforms prove that the power system scheme of this paper is correct and feasible.

[发布机构] School of Aeronautics, Northwestern Polytechnical University, Xian, China^1;Dongguan Sanhang Civilmilitary Integration Innovation Institute, Dongguan, Guangdong, China^2

[效力级别] 无线电电子学 [学科分类] 材料科学（综合）

[关键词] Current loop;Double closed-loop controllers;Hardware structures;Overall controls;Pulsed MIG welding;Small signal model;System scheme;Two-transistor Forward converters