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Unformatted text preview: 3-The thyristor in the shown circuit has a latching current level of 50mA and is fired by a pulse of length 50 microseconds. Show that without resistance R the thyristor will fail to remain on when the firing pulse ends, and then find the maximum value of R to ensure firing. Neglect the voltage drop. R L =20Ω, L=0.5H. 4- A thyristor has a forward characteristic which may be approximated over its normal working range to the straight line shown in figure. Estimate the mean power loss for: a. A continuous on-state current of 23A b. A half sine wave of mean value 18 A c. A level current of 48.5 A for one-third cycle...
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- Spring '10
- Alternating Current, Voltage drop