Title :
Digital control of double- pulsed gas metal arc welding machine
Author :
Sha, Deshang ; Liao, Xiaozhong
Author_Institution :
Sch. of Autom., Beijing Inst. of Technol., Beijing, China
Abstract :
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.
Keywords :
DC-DC power convertors; arc welding; closed loop systems; digital control; electric current control; electric machines; invertors; pulsed power technology; welding equipment; DC-DC converter; DSP; arc length regulation; buck converter; digital control; double closed loop control; double-pulsed gas metal arc welding machine; full-bridge inverter; instantaneous current control; phase-shifted full-bridge PWM gating signal generation; power 20 kW; triple closed loop control model; wire feeder; 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;
Conference_Titel :
Power Electronics and Motion Control Conference, 2009. IPEMC '09. IEEE 6th International
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-3556-2
Electronic_ISBN :
978-1-4244-3557-9
DOI :
10.1109/IPEMC.2009.5157839
