Light-Load Efficiency Power Conversion Scheme Using Bidirectional Buck Converter

Abstract

High efficiency under a light-load condition is becoming important ,because power systems operate mostly under this condition. In the current social atmosphere promoting energy savings, high efficiency is valued for server power supplies in data centers to reduce power consumption. For this reason, many programs and regulations require high light-load efficiency. In this project, a new power conversion scheme considering paralleled modules is to be proposed. Under a very light-load condition, only a non-isolated buck converter in the secondary side of the remaining power supply provides the output power, which is different from the cold-redundant (CR) concept.Furthermore,in the proposed concept, the voltage source in the buck converter is maximized by using an additional voltage bus connecting between the snubber capacitors of each module. To achieve high power density, the buck converter is integrated with the rectifier circuits in the secondary side of the Phase shift full-bridge(PSFB) converter. The validity of the basic operational principles is confirmed with two 12V/750W by using MATLAB/ simulink software .The results will be demonstrated for the proposed converter.