Flying Transformer Multi-Level Converter for Isolation and Seamless Control for 48V POL Applications

This paper introduces a new Flying Transformer Multi-Level (FTML) converter for 48V Point-of-load applications. The converter can provide seamless control and regulation as well as isolation. The topology allows the converter to have a multilevel structure without any direct involvement of capacitors transferring significant power and core balancing to the converter. A converter prototype has been built, targeting a voltage conversion of 48V to 1V, a peak output current of 20A, and peak efficiency of 73.3% including gate drive losses and without optimization.