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Technical Briefs

Chimney Effect on Natural Convection Cooling of a Transistor Mounted on a Cooling Fin

[+] Author and Article Information
G. De Mey

Department of Electronics and Information Systems, University of Ghent, Sint Pietersnieuwstraat 41, 9000 Ghent, Belgiumdemey@elis.ugent.be

M. Wójcik, J. Pilarski, M. Lasota, A. Napieralski

Department of Microelectronics and Computer Science, Technical University of Łódź, aleja Politechniki 11, 91-850 Łódź, Poland

J. Banaszczyk, B. Vermeersch

Department of Electronics and Information Systems, University of Ghent, Sint Pietersnieuwstraat 41, 9000 Ghent, Belgium

M. De Paepe

Department of Flow, Heat and Combustion, University of Ghent, Sint Pietersnieuwstraat 41, 9000 Ghent, Belgium

J. Electron. Packag 131(1), 014501 (Feb 12, 2009) (3 pages) doi:10.1115/1.3068307 History: Received April 25, 2008; Revised July 01, 2008; Published February 12, 2009

The thermal impedance Zth(jω) has been measured for the junction of a transistor mounted on a cooling fin. The setup was put inside a chimney in order to enhance the natural convection cooling. From the thermal impedance Zth(jω) the influence of the chimney on the reduction in thermal resistance Rth=Zth(jω=0) is clearly visible. A maximum improvement of almost 20% has been observed experimentally. Measuring the thermal impedance as a function of the angular frequency ω provides specific information about the thermal path being influenced by the chimney.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Schematic layout of the chimney and the transistor mounted on a cooling fin

Grahic Jump Location
Figure 2

Nyquist plot of the thermal impedance for H=10 cm

Grahic Jump Location
Figure 3

Nyquist plot of the thermal impedance for H=30 cm

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