Digital control of double- pulsed gas metal arc welding machine

In this paper, a fully digitalized phase-shifted full-bridge PWM gating signals generation based on symmetrical carrier is proposed. To make wire feeder vary synchronously with the output current of DC/DC converter, double closed loop control is implemented by DSP. Besides, to improve the dynamic re...

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Bibliographic Details
Published in2009 IEEE 6th International Power Electronics and Motion Control Conference pp. 2573 - 2576
Main Authors Deshang Sha, Xiaozhong Liao
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.05.2009
Subjects
Buck converters
DC-DC power converters
Digital control
Digital signal processing
Pulse width modulation
Pulse width modulation inverters
Signal generators
Space vector pulse width modulation
Welding
Wire
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Summary:In this paper, a fully digitalized phase-shifted full-bridge PWM gating signals generation based on symmetrical carrier is proposed. To make wire feeder vary synchronously with the output current of DC/DC converter, double closed loop control is implemented by DSP. Besides, to improve the dynamic response of wire feeder, power stage for the motor is made up of a buck converter cascaded with a full-bridge inverter . A triple closed loop control model with full digital control is also presented to achieve double-pulsed GMAW process. The control model also contains stick-out length compensation, arc length regulation and instantaneous current control. Flexibility and reliability of the proposed control strategy for DP-GMAW implemented by two DSPs are validated by welding experimental results of 20 kW prototype.
ISBN:1424435560
9781424435562
DOI:10.1109/IPEMC.2009.5157839