High Efficiency, Narrow Output Range and Extended Hold-Up Time Power Supply with Planar and Integrated Magnetics for Server Applications
Conference: PCIM Europe digital days 2021 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/03/2021 - 05/07/2021 at Online
Proceedings: PCIM Europe digital days 2021
Pages: 8Language: englishTyp: PDF
Authors:
Escudero, Manuel; Kutschak, Matteo-Alessandro; Meneses, David (Infineon Technologies AG, Austria)
Rodriguez, Noel; Morales, Diego Pedro (Department of Electronics and Computers Technology, University of Granada, Spain)
Abstract:
In this paper, the design of a new complete power supply for server applications is discussed. The main constraints of the new solution are the very high peak efficiency, the long hold-up time and the maximum outer dimension. The PSU is comprised of a front-end ACDC bridgeless totem-pole PFC and a back-end DCDC half-bridge LLC. Due to the extended hold-up time, the PSU requires large intermediate energy storage and an extended gain range for the LLC. Due to the outer dimension limits, a planar transformer with reduced height and volume is preferred. Finally, the very high efficiency target requires a careful design based on the accurate modeling of the overall losses of the converter. The analysis is demonstrated experimentally with a 3 kW PSU achieving 97.47 % of efficiency at 230 VAC.