An efficient AC/DC power supply unit design approach used in communication switches

Abstract

Power supply unit that demands an isolated, regulated output voltage with power factor correction typically necessitate a two stage conversion process and it incorporates an input boost or bridge-less power factor corrector stage which converts, regulates the input line voltage into a nominal 400 V DC. This bus then excites a conventional dc-to-dc converter, which can be any suitable topology. This paper is aimed to design, analysis, MATLAB simulation and development of compact 48-V DC, 2KW power supply unit (PSU) used in communication switches. This module incorporate boost power factor corrector to improve power factor followed by robust LLC resonant converter to increase efficiency and to achieve ZVS. UC3855B PFC boost controller, UCC2895D LLC controller and additional control circuitry is used to control additional parameters. The design enables efficiency greater than 93% over a wide load range.