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 efficient 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.
Highlights
As the number of devices connected to the Internet and the available services increase, the volume of data transferred and processed by server systems is growing exponentially
Interdependencies and limits the design engineer understanding of the converter. In this this work work we we present present aa complete complete losses losses model model of of the the phase shift full bridge (PSFB), PSFB, which which should should prove prove useful useful for for practicing inin the converter
The analysis shows that a capacitor can be charged with only a modest energy loss in a series RLC circuit only if the source is disconnected after 12 resonance cycle
Summary
As the number of devices connected to the Internet and the available services increase, the volume of data transferred and processed by server systems is growing exponentially. Since the server power supplies consume massive amounts of power, the most critical matter is to achieve high efficiency [1]. To promote electrical energy efficiency of server systems several organizations have setup initiatives like climate-savers-computing-initiative (CSCI) [2] and 80 PLUS [3]. CSCI and 80 PLUS keep introducing higher efficiency certifications such as Gold, Platinum, and Titanium with growing requirements extending to light loads (Table 1). The required efficiency at 50% load condition for each certification is the highest and the most difficult to achieve, based on the redundant configuration of the server power system. The redundant structure is widely used in the server power supply applications because of the very high reliability demand characteristics of the application
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