d) A thyristor in a fully-controlled converter that supplies 615 A to a D.C. load is mounted on a 0.5 kg aluminium heat sink. If the forward voltage across the device is 1.5 V, and aluminium has a specific heat capacity of 895 J(kg °C)-¹. The ambient temperature is 40 °C maximum and the thyristor is mounted directly on the heat sink. (i) Calculate the steady state temperature of the thyristor junction, given that the thermal resistance of the heat sink is 0.15 °C W-¹ and that of the device is 0.12°CW-¹. (ii) Calculate how long it takes the heat sink to reach a steady-state temperature?
d) A thyristor in a fully-controlled converter that supplies 615 A to a D.C. load is mounted on a 0.5 kg aluminium heat sink. If the forward voltage across the device is 1.5 V, and aluminium has a specific heat capacity of 895 J(kg °C)-¹. The ambient temperature is 40 °C maximum and the thyristor is mounted directly on the heat sink. (i) Calculate the steady state temperature of the thyristor junction, given that the thermal resistance of the heat sink is 0.15 °C W-¹ and that of the device is 0.12°CW-¹. (ii) Calculate how long it takes the heat sink to reach a steady-state temperature?
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter21: Resistive-capacitive Series Circuits
Section: Chapter Questions
Problem 7RQ: An RC series circuit is connected to a 120-V, 60-Hz power source. The resistor is 25 and has a...
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