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Efficiency Improvements for High Frequency Resistance Spot Welding
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| Author(s) |
Martin WAGNER, Stefan KOLB |
| Abstract |
Resistance spot welding uses direct current in the range of 1 kA to more than 100 kA to join sheetmetals. The current is provided by an inverter that is connected a dc-link capacitor and transformer witha high turns ratio. The current is rectified at the secondary side of the transformer. Since the voltagebetween the tips of the welding electrodes is in the range of only a few Volts the voltage drop acrossthe rectifier diodes contributes to high losses and therefore to a low efficiency. This paper presentsa new high frequency transformer optimized for welding applications, which consists of submodulesof planar transformers with integrated synchronous rectification, allowing size reduction and improvedcontrollability of the welding process while reducing the transformer size and losses thus increasing theoverall system efficiency. The potential of the new welding transformer is shown through experimentalresults. |
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| Filename: | 0895-epe2013-full-14505179.pdf |
| Filesize: | 1.664 MB |
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| Type |
Members Only |
| Date |
Last modified 2014-02-09 by System |
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