In this paper, two second-generation high power density DC/DC converter modules have been evaluated at low operating temperatures. The power rating of one converter (Module I) was specified at 150 W with an input voltage range of 36-75 V and output voltage of 12 V. The other converter (Module 2) was specified at 100 W with the same input voltage range and an output voltage of 3.3 V. The converter modules were evaluated in terms of their performance as a function of operating temperature in the range of 25 °C to -140 °C. The experimental procedures along with the experimental data obtained are presented and discussed in this paper.
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