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Leveraging Multi-Phase and Fractional-Turn Integrated Planar Transformers for Miniaturization in Data Center Applications

Data center servers represent an important and growing electrical load, and there is strong interest in miniaturizing the supplies that power them. This paper investigates the use of multi-phase and fractional-turn transformers in this application space and finds that they can offer significant miniaturization benefit especially in the 12V/1kW regime where a split-phase fractional turn transformer is estimated to operate with 3.1 times lower loss than a single-phase configuration.