Examinations of erosions in thyristors for surge current loads with the single pulse detector for infrared observation 'EMIR'
The single pulse measuring appliance for infrared observation allows the recognition of changes in the thyristor surface, by the quick detection of 'hot spots'. Currents between 6000 and 8500 A during 25 microseconds were used for the test pieces. The microscopic examination of the marked spots showed melting points on the silicon surface. The melting temperature was 1415 C. The calculation for the thermal load of the emitter between the critical zones, did not show any critical temperature value. Thyristors with cross field emitters are more resistant to short shock flows than those without such cross field emitters. The infrared measures, using EMIR (German acronym for single pulse detector for infrared observation) showed the homogenizing action of the cross field emitter.
- Pub Date:
- Infrared Detectors;
- Melting Points;
- Critical Temperature;
- Electric Current;
- Electric Pulses;
- Electronics and Electrical Engineering