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GTO CHOPPER AT 2000 Hz SWITCHING FREQUENCY FOR A DC CURRENT SOURCE 1000 A - 1200 V
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| Author(s) |
G. Coquery; R. Lallemand; J. L. Peureux |
| Abstract |
Thyristors GTO are used in choppers circuits to deliver a DC current to supply resonant power inverters or plasma are power devices. A 1,2 MW power is obtained with connection in parallel of two chopper modules including each one only one GTO switch with a DC rectifier. A 2000 Hz switching frequency is reached by using two choppers module with an overlapped 1000 Hz switch on. For each chopper the repetitive current commutated is 600 A onder the nominal DC voltage of 1200 V, this is possible without increasing GTO's switching losses by using the highly interdigited GTO's structure in the thyristors assisted operation mode. A protection is available against direct short-circuit on the output. A current regulation allows a good dynamic response on the whole current range. This paper discusses and describes the commutation principle of GTO, and shows oscillograms and experimental results at 1 MW output power on resistive load and plasma arc. |
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| Filename: | Unnamed file |
| Filesize: | 4.156 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-05-13 by System |
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