A server rack may require DC voltages at various levels such as 12 volts, 1.8 volts, 1.2 volts, etc. that are suitable for different computing devices. In operation, a supply voltage is converted to the voltage required by corresponding computing devices. The voltage-level conversion is done in stages. A first stage converts from the supply voltage, e.g., 48 volts, to an intermediate voltage, e.g., in the range 7 to 15 volts. A second stage converts from the intermediate voltage to the appropriate output voltage. Efficiency of power conversion system varies with load, and depends on the intermediate voltage. This document describes techniques to measure conversion efficiency and adapt the intermediate voltage to optimize efficiency of power conversion system.
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Jia, Liang, "ADAPTIVE VOLTAGE CONVERSION FOR ENERGY EFFICIENT COMPUTING", Technical Disclosure Commons, (June 03, 2016)