A single-switch DC chopper exhibits 15 W of MOSFET losses and 5 W of diode losses. To dissipate the heat generated by the losses the MOSFET and diode are connected to the same heatsink. The thermal resistance between the MOSFET junction and the case is 2.2 °C/W and the thermal resistance between the diode junction and the case is 1.3 °C/W. The MOSFET and the diode have a case to heatsink thermal resistance of 0.7 °C/W. The maximum ambient temperature is expected to be 40 °C. i) Draw and annotate an equivalent thermal circuit for the components mentioned above. If the junction temperature of either the MOSFET or the diode is not allowed to exceed 110 °C, calculate the maximum thermal resistance of the heatsink. ii)
A single-switch DC chopper exhibits 15 W of MOSFET losses and 5 W of diode losses. To dissipate the heat generated by the losses the MOSFET and diode are connected to the same heatsink. The thermal resistance between the MOSFET junction and the case is 2.2 °C/W and the thermal resistance between the diode junction and the case is 1.3 °C/W. The MOSFET and the diode have a case to heatsink thermal resistance of 0.7 °C/W. The maximum ambient temperature is expected to be 40 °C. i) Draw and annotate an equivalent thermal circuit for the components mentioned above. If the junction temperature of either the MOSFET or the diode is not allowed to exceed 110 °C, calculate the maximum thermal resistance of the heatsink. ii)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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ii)Rhs= 1.325 ℃/w
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