a. Using Figure determine the minimum irradiance required to fire the device at room temperature (25°C). b. What percentage reduction in irradiance is allowable if the junction temperature is increased from 0°C (32°F) to 100°C (212°F)? "

Electric Motor Control
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ISBN:9781133702818
Author:Herman
Publisher:Herman
Chapter59: Motor Startup And Troubleshooting Basics
Section: Chapter Questions
Problem 12SQ: How is a solid-state diode tested? Explain.
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Question
a. Using Figure
determine the minimum irradiance required to fire the device at room
temperature (25°C).
b. What percentage reduction in irradiance is allowable if the junction temperature is increased from
0°C (32°F) to 100°C (212°F)?
"
Transcribed Image Text:a. Using Figure determine the minimum irradiance required to fire the device at room temperature (25°C). b. What percentage reduction in irradiance is allowable if the junction temperature is increased from 0°C (32°F) to 100°C (212°F)? "
Effective irradiance (mW/cm²)
40
20
10
8
6
2
0.8
0.6
0.4
0.2
0.1
0.08
0.06
0.04
-60
No units trigger in this area
Triggering region
Notes:
(1) Shaded area represents the locus of possible
triggering points from -65°C to 100°C
(2) Applied anode voltage = 6 V dc
(3) Gate to cathode resistance = 56,000 Q
(4) Light source perpendicular to plane of header.
-40
-20
20
40
0
Junction temperature (°C)
(b)
80
100
Transcribed Image Text:Effective irradiance (mW/cm²) 40 20 10 8 6 2 0.8 0.6 0.4 0.2 0.1 0.08 0.06 0.04 -60 No units trigger in this area Triggering region Notes: (1) Shaded area represents the locus of possible triggering points from -65°C to 100°C (2) Applied anode voltage = 6 V dc (3) Gate to cathode resistance = 56,000 Q (4) Light source perpendicular to plane of header. -40 -20 20 40 0 Junction temperature (°C) (b) 80 100
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