Two-port network theory based thermal characterization of power module packages

¹ Département de physique de la Faculté des sciences, Université de Fianarantsoa, 301 Fianarantsoa, Madagascar
² Laboratoire d'Architecture et d'Analyse des Systèmes du CNRS, 7 avenue de Colonel Roche, 31077 Toulouse Cedex 04, France
³ Institut National des Sciences Appliquées de Toulouse, 135 avenue de Rangueil, 31077 Toulouse Cedex 04, France

Corresponding authors: faniry@syfed.refer.mg dorkel@laas.fr tounsi@laas.fr

Received: 30 January 2001
Revised: 8 January 2002
Accepted: 24 January 2002
Published online: 15 April 2002

Abstract

For thermal analysis, power module packages can often be considered as plane multilayered systems for which it has been demonstrated that appropriate Fourier transforms associated with the two-port network theory permit to develop very efficient solutions of the static or the time dependent 3D heat flow equation. However, in practice, the thermal resistances of soldered or pasted interfaces are most often not well known. Most of these parameters are theoretically unpredictable, therefore it is of highest interest to develop an experimental procedure intended for an adequate characterization of the 3D thermal behaviour of the cooling substrates. A two-port network theoretical basis for experimental characterization of the thermal behaviour of multilayered substrates (96% Alumina, AU4G, IMS), which are classically used for power module packaging, is presented. In spite of some difficulties in setting perfectly the boundary conditions for temperature and heat fluxes, the experimental results demonstrate the validity of the characterization method, and the soughted parameters can be measured for wide ranges of spatial pulsation. Suggested improvements of the existing experimental set can give rise to an industrial measurement set intended for thermal characterization of power module packages.