A Practical Approach to the Design of a Highly Efficient PSFB DC-DC Converter for Server Applications
Metadata
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MDPI
Materia
Phase shift full bridge High-efficiency DC-DC Server
Date
2019-09-29Referencia bibliográfica
Escudero, M., Kutschak, M. A., Meneses, D., Rodriguez, N., & Morales, D. P. (2019). A Practical Approach to the Design of a Highly Efficient PSFB DC-DC Converter for Server Applications. Energies, 12(19), 3723.
Sponsorship
This research was financed by Infineon Technologies AG.Abstract
The phase shift full bridge (PSFB) is a widely known isolated DC-DC converter topology
commonly used in medium to high power applications, and one of the best candidates for the front-end
DC-DC converter in server power supplies. Since the server power supplies consume an enormous
amount of power, the most critical issue is to achieve high efficiency. Several organizations promoting
electrical energy efficiency, like the 80 PLUS, keep introducing higher efficiency certifications with
growing requirements extending also to light loads. The design of a high efficiency PSFB converter is
a complex problem with many degrees of freedom which requires of a sufficiently accurate modeling
of the losses and of e cient design criteria. In this work a losses model of the converter is proposed as
well as design guidelines for the efficiency optimization of PSFB converter. The model and the criteria
are tested with the redesign of an existing reference PSFB converter of 1400 W for server applications,
with wide input voltage range, nominal 400 V input and 12 V output; achieving 95.85% of efficiency at
50% of the load. A new optimized prototype of PSFB was built with the same specifications, achieving
a peak efficiency of 96.68% at 50% of the load.