Analysis and Design of LLC Resonant Converter with Synchronous Rectification

The advent of contemporary power electronics technology has precipitated a paradigm shift in the realm of data center architecture. The 48V busbar configuration, a hallmark of modern data center design, necessitates the integration of front-end DC-DC converters. These converters are instrumental in attaining two paramount objectives: high power density and high efficiency. The miniaturization and high efficiency of switching power supplies have become significant areas of research. The present paper analyses the optimization of power loss distribution through synchronous rectification and proposes the use of this technology to enhance the performance of LLC resonant converters. In order to validate the theoretical model, circuit simulation analysis was first conducted, followed by the construction of comparison prototypes with and without synchronous rectification for experimental verification. The development of a prototype 1/8-brick LLC resonant converter with a 48V input, 6V output, and 200W power capacity has been successfully achieved. The synchronous rectification prototype has been shown to achieve a peak efficiency of 94.5% and a power density of 93.80W/in³