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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