Air-Water Cooling System for Switch-Mode Power Supplies


The results are presented of an experimental investigation of heat transfer in an air-liquid cooling system for a Switch-Mode Power Supply (SMPS) for TV digital power amplifiers. Since these SMPSs are characterized by high power and high compactness, thereby making the standard cooling techniques difficult to be used, a new cooling system is developed, using water and air as the cooling media. The active components (MOSFETs) are cooled with a liquid cold-plate, the passive ones (condensers, transformers, coils) with an air flow, in turn cooled by the cold-plate. By inserting the cooling system in an experimental tool where it is possible to control the cooling water, measurements are made of temperature in the significant points of the SMPS. The electric efficiency is also measured. The evaluation of the thermal performance of this cooling system is useful in order to limit its maximum operational temperature. The efficacy of the cooling system is demonstrated; the trends of efficiency and power dissipation are evidenced.

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Casano, G. and Piva, S. (2015) Air-Water Cooling System for Switch-Mode Power Supplies. Journal of Electronics Cooling and Thermal Control, 5, 66-75. doi: 10.4236/jectc.2015.53005.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Mohan, N., Undeland, T.M. and Robbins, W.P. (2003) Power Electronics: Converters, Applications, and Design. 3rd Edition, Wiley, New York.
[2] Koizumi, K., Joboji, A., Nagahara, K. and Ishizuka, M. (2003) Thermal Analysis of Natural Convection Cooled Switch Mode Power Supplies. 2003 International Electronic Packaging Technical Conference and Exhibition, Maui, 6-11 July 2003, 103-109.
[3] Koizumi, K., Joboji, A., Nagahara, K. and Ishizuka, M. (2004) Development of Thermal Flow Simulation Method for Switch Mode Power Supplies and Its Integration with Electric Circuit Analysis (in the Case of Natural Convection Air Cooled Switch Mode Power Supply). Heat Transfer—Asian Research, 33, 473-489.
[4] Hiraki, M., Kano, T., Kizu, H., Satoh, H., Yamashita, S., Kobayashi, K., Tanaka, H., Arai, Y., Satoh, K. and Fuchigami, K. (1989) Water-Cooled Switching Power Supply. 11th International Telecommunications Energy Conference, 2, 20.8/1-20.8/7.
[5] Sabin, M. and Piva, S. (2014) Numerical Analysis of a Cold Plate for FM Radio Power Amplifiers. Journal of Physics: Conference Series, 525, Article ID: 012001.
[6] Valdova Antonova, A., Tural, E. and Stanchev Andreev, A. (2008) Contactless Thermal Characterization Method of Switching Mode Power Supply. Vol. 4, Proc. of Electronics’ 2008, Sozopol, 24-26 September 2008, 3-8.

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