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A new high-efficient phase-shifted full-bridge (PSFB) converter is proposed in this paper. The conventional PSFB converter with an external inductor and clamping diodes is widely used in server power systems due to limited voltage stress on switches and its zero-voltage switching (ZVS) characteristics. However, a hold-up time regulation rule in server systems limits its operating duty ratio in nominal...
An adaptive link capacitor voltage variation control method for server power supply is proposed. In this paper, to increase the efficiency under light load condition, the proposed scheme adjusts nominal link capacitor voltage with the consideration of the hold-up time requirement. Thereby, the effective duty ratio of DC/DC stage can be expanded and we can save the power loss. Therefore, power losses...
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