Until now, many SMPS designers have taken the ON-ON transformer operation mode — widely adopted in topologies such as FBPS and LLC — for granted. As a result, the vast majority of high-performance switched-mode power supplies (DC-DC converters) that use transformers have operated in this mode. Technological approaches to achieving further miniaturization and higher efficiency have mainly focused on soft-switching techniques, higher switching frequencies, and improvements in passive components.
In this presentation, we introduce a new approach that enhances DC-DC converter performance by reexamining the transformer operation mode and magnetic flux density behavior, incorporating a low-permeability magnetic core.
