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OVERCURRENT PROTECTION AND SWITCHING AID FOR POWER DARLINGTONS: AN UNIQUE APPROACH
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| Author(s) |
A. R. Quintas; J. A. Faria; A. P. Martins: A. S. Araujo; J. P. Silva |
| Abstract |
This paper presents a new approach for overcurrent protection and switching aid of Power Darlington Transistors used in a UPS inverter. The approach come through specific requirements and characteristics of UPS and Power Darlington Transistors. It is noted that storage time and output transformer introduce low frequency distortion. The minimun output filter for this application was obtained for a switching frequency near 2 KHz. At this level switching losses are small when compared with total losses. This fact greatly simplifies the switching aid circuits, being then possible to reduce it to a voltage clamp and a series inductance. The circuit reveals to be cost effective and reliable and uses only low performance/cost components. Experimental results are presented for a 40 KVA UPS that was conceived at Porto University and is now manufactured by a portuguese company. |
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| Filename: | Unnamed file |
| Filesize: | 561.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-12 by System |
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