Improving the Overall Efficiency for DC/DC Converter with LoV-HiC System

Abstract

It is very important to improve the overall efficiency of systems with a source of power that has low-voltage high-current terminal characteristics such as fuel cells. A resonant converter is required for high efficiency systems. However, the peak value of the switches current is large in a resonant converter. This peak current requires a large number of switches and results in system failures. In this paper, an analysis and experiments of a resonant isolation push-pull converter are performed. A switching loss analysis is performed in order to compare losses between a resonant push pull converter and a hard switching push-pull converter. Specially, the conduction loss is studied based on the ratio between the resonant frequency and the switching frequency. In addition, a method for improving the efficiency is implemented with conventional HF insolation converters.

Analysis and Implementation of a Half Bridge Class-DE Rectifier for Front-End ZVS Push-Pull Resonant Converters

“…The push-pull resonant converter topologies in [1]- [3] were used in front-end DC/DC converters for distributed power generation based on battery-based energy storage or renewable energy systems [4]- [8] such as photovoltaic, fuel cells, wind turbines, etc. The push-pull resonant converter topology is suitable for unregulated low-voltage, V LVDC , to high-voltage, V HVDC , power conversion systems, which feed stand-alone and grid-connected inverters.…”