Integrated Inductor for A Highly Compact 2-Phase Interleaving ZVS Buck Converter

A new integrated inductor for a 2-phase interleaving buck converter is designed and built in this work. ZVS is achieved by sizing the inductor based on energy balance and introducing the
$k$
factor. A 4-leg magnetic core structure is proposed as the integrated inductor. By introducing the modified parameter
$\alpha_{\text{eff}}$
to iGSE method, the optimal switching frequency for core loss can be found, which is 2 MHz in this case. A highly compact prototype, featuring stacked PCB solution, with
$16.2\times 19.2\times 6\ \text{mm}^{3}$
size is built. Input voltage ranges from 6 V to 12 V and the converter is capable of delivering up to 10 A at 4 V output. Peak efficiency of 96 % is achieved.