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OPTIMIZATION OF CATHODE STRUCTURES FOR IMPROVED PERFORMANCE OF MOS CONTROLLED THYRISTORS (MCT)
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| Author(s) |
F. Bauer; H. Haddon; T. Stockmeier; W. Fichtner; R. Vuilleumier; J.-M. Moret |
| Abstract |
We have analysed cathode structures for MCT's in an effort to optimize device performance, i.e. maximum current turn-off capability of large area cell arrays. A combination
of a p-channel DMOS technology and an adapted thyristor process was used to fabricate arrangements of single cells, cell rows, stripes and various arrays of up to 21'000 cells with forward blocking voltages exceeding 2'000 V. The analysis of cellular type MCTs with cell pitches between 15 μm and 30 μm revealed a cell scaling law for MCT cell arrays: the turn-off capability is inversely proportional to the cell pitch. Using a cellular cathode structure permits a higher turn-off current level as compared to a cathode design composed of continous stripes. The maximum turn-off current density in large MCT arrays is drastically reduced as compared to single cells. Despite this fact, current densities of 70 A/cm2 (Va= 2 kV) can be controlled under snubberless clamped inductive load conditions with MCTs with an actice area of 8.4 mm2. |
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| Filename: | Unnamed file |
| Filesize: | 3.883 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-07-16 by System |
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