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Snubbers in the Three-Phase AC to DC Buck Converter
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| Author(s) |
Franc Mihalic, Dejan Kos, Miran Rodic, Miro Milanovic |
| Abstract |
In this paper, investigation of effective snubber
circuits in the three-phase AC to DC buck converter is
presented. Based on the theoretical analysis and from the
conventional matrix converters theory approach, the mathematical
proof for an AC to DC power converter with unity
input displacement factor (IDF) operation without current
sensing, is provided. For the DC output current bulky
inductance in the output filter is needed and appropriate
modulation strategy without open circuit terminals must be
assured. High inductance and very short switching times
of the power switches are main source of the high and
destroying dv/dt in the power converter. This problem can
be overcome by proper driving circuits and by appropriate
design of the effective snubber circuits not only at the
switching power transistors but also at the series diodes as
well. And finally, all theoretical considerations are verified
by digital simulations and measurements on a low-power
prototype of a three-phase buck rectifier. |
| Download |
| Filename: | T3-215.pdf |
| Filesize: | 329.6 KB |
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| Type |
Members Only |
| Date |
Last modified 2007-03-12 by System |
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