One approach to reduce the high winding loss for PCB winding based inductor is interleaving windings of different phases in a form of coupled inductor. In this way, however, the available coupling coefficient is generally constrained to a certain range that limited by winding structures. This paper proposes a new interleaving approach for integrated PCB winding inductors. It extends the available values of coupling coefficient to a larger range from zero to almost unity while still maintaining the benefits of winding interleaving. Furthermore, the proposed approach enables the implementation of balance technique for common-mode noise suppression using PCB winding inductors. A 2.2 kW totem-pole AC/DC converter with a peak efficiency of 99% is demonstrated as an example.
.jpg "Shuo Wang, PhD candidate photo")