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Design optimization of an integrated liquid-cooled IGBT power module using CFD technique

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1 Author(s)
Lee, T.-Y.T. ; Motorola Inc., Tempe, AZ, USA

This paper presents a novel approach to optimize pin array design of an integrated, liquid-cooled, insulated gate bipolar transistor (IGBT) power module. With the aid of a computational fluid dynamics (CFD) code, the fluid field and heat transfer inside the module were analyzed, and several design options for pin arrays were examined. For IGBT die circuitry, the uniformity of temperature distribution among the dies is as critical as the magnitude of the die temperature. A noticeable variation in temperature among dies can accelerate thermal runaway and reduce device reliability. With geometrically-optimized-pin designs located both upstream and downstream of the channel, a total power dissipation of 1200 W was achieved. The maximum junction temperature was maintained at ~100°C and the maximum variation among dies was controlled to within 1°C. The results from this study indicated that the device junction temperatures were not only reduced in magnitude but were also equalized. In addition, the maximum power dissipation of the module was enhanced. Comparison with other direct (pool boiling) and indirect (cold plate) liquid cooling techniques was also discussed

Published in:

Thermal and Thermomechanical Phenomena in Electronic Systems, 1998. ITHERM '98. The Sixth Intersociety Conference on

Date of Conference:

27-30 May 1998