Title :
Input-series common transformer connected PS-FB DC-DC converters for pulsed MIG welding
Author :
Song, Xiaoqing ; Sha, Deshang ; Liao, Xiaozhong
Author_Institution :
Sch. of Autom., Beijing Inst. of Technol., Beijing, China
Abstract :
A pulsed Metal Inert Gas (PMIG) welding system is built based on the input-series common transformer connected phase-shifted full-bridge (PS-FB) DC/DC converters. Because the input-series connected converters share the same transformer magnetic core, equal sharing of input voltage can be achieved automatically without special voltage sharing control. To enhance the reliability of the system, a hybrid peak current control strategy consisting of arc length loop, average current loop and peak current loop is adopted. The system stability is analyzed based on the small signal model. The effectiveness of the proposed topology and its control strategy are verified by experimental results of a 15kW-50kHz welding machine.
Keywords :
DC-DC power convertors; arc welding; bridge circuits; electric current control; phase shifters; stability; transformer cores; arc length loop; frequency 50 kHz; hybrid peak current control strategy; input series common transformer; input voltage sharing; phase shifted full bridge DC-DC converter; power 15 kW; pulsed MIG welding; pulsed metal inert gas welding system; small signal model; system stability; transformer magnetic core; Current control; Current transformers; Feeds; Metals; Voltage control; Welding; Wires;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2012 Twenty-Seventh Annual IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4577-1215-9
Electronic_ISBN :
978-1-4577-1214-2
DOI :
10.1109/APEC.2012.6166126
