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Series Load-Resonant Converter with an Auxiliary Resonant Commutated Pole Circuit for Controlled-Current Arc Welding Power Supply
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| Author(s) |
F. X. Fifatin; S. Pierfederici; B. Davat |
| Abstract |
An arc welding power supply requires the ability to easily adapt output voltage under output current to
maintain a good arc for welding. The high frequency operation of the converter minimizes the size of
the magnetic components and reduces output current ripples. This paper presents a new method to
control arc welding power supply. Contrarily to the classical proposed methods [1, 5, 6, 12], a nondissipative
snubber is added to the inverter and a control scheme based on the relationship between the
chosen materials and its voltage-current characteristic is implemented. This helps to control burnback
and the quantity of welding wire, which is deposited. The power converter used is a serial resonant
inverter and the power control is realized by a variation of the duty cycle at the resonance frequency
(phase shift control). The systematic control of the power output and the locking to the resonant
frequency are realized by a DSP.
A converter with an output voltage of 25 V and output current of 200 A operating at 80 kHz has been
designed and constructed. Simulated and experimental results of the converter are presented. |
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| Filename: | EPE1999 - PP00430 - Pierfederici.pdf |
| Filesize: | 182.4 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-04-08 by System |
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