A new PSFB converter-based inverter arc welding machine with high power density and high efficiency

In this study, a high-performance single-phase inverter arc welding machine is presented. Power control of the developed welding machine is realized with a high-frequency, phase-shifted full bridge (PSFB) pulse-width modulation (PWM) converter. The PSFB PWM converter operates with soft switching at no load and full load. There is no need to use a passive snubber in the converter. Welding machine control is implemented with a digital signal processor (DSP) and phase-shift PWM IC. By means of the DSP, advanced arc welding functions and protection features such as short-circuit, over-current, and temperature protection are achieved. The current and voltage waveforms given are from an IGBT-based PSFB PWM arc welding machine operating at 75 kHz switching frequency and 160 A output current. The experimental results show that the proposed system has promising feasibility in industrial applications.

Anahtar Kelimeler:

Arc welding machine, PSFB PWM converter, DC-DC converter, soft switching, zero-voltage transition, zero-voltage switching, IGBT

A new PSFB converter-based inverter arc welding machine with high power density and high efficiency

Keywords:

Arc welding machine, PSFB PWM converter, DC-DC converter, soft switching, zero-voltage transition, zero-voltage switching, IGBT,

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Efficiency curves of the arc welding machines are shown in Figure 17. The efficiency waveforms are obtained by measuring the input and output power of the welding machines. From Figure 17, it is seen that the developed welding machine has higher efficiency than the other machines. The efficiency of the developed welding machine is 83% at nominal output current. 5. Conclusions
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