December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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470 Introduction to Electrical Power and Power Electronics
Solution:
We read from Table 17.3 that the thermal resistance from the heat sink surface to
air for heat sink #9 is 1.25°C/W.
Therefore, the total thermal resistance of three elements in series = 0.9 + 0.5+
1.25 = 2.65°C/W.
The junction temperature rise above cabinet air = 25 × 2.65 = 66.25°C, and the
maximum total junction temperature = 66.25 + 55 = 121.15°C.
17.3 CONVECTION AND RADIATION
Conduction is the only mode of heat transfer from the interior of the semiconduct-
ing device junction to the heat sink surface. From there, the heat is dissipated by
convection and radiation to the a
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