On the design and experimentation of a high performance 25 A/48 V rectifier unit

Abstract

A 25 A/48 V rectifier unit to be used as a battery charger for telecommunication applications is described. The unit is based on a modified version of the full-bridge zero-voltage switching pulse width modulated (FB-ZVS-PWM) DC/DC converter, which operates with no switching losses from no-load to full-load. The input stage is composed of a single-phase AC-to-DC converter with two diodes and two thyristors, which limit the inrush current, and it is used to disconnect the unit from the line in the case of malfunction. A 100-kHz operational prototype has been designed, fabricated and successfully tested in a laboratory. The overall measured efficiency is 94% at full load. Design procedure and experimental results are presented and discussed.<>