Using 2-D Core and Origami Winding to Push the First Resonant Frequency of Nanocrystalline Common-Mode Inductors Beyond 10 MHz With Improved Performance

The first resonant frequency (f_R) is usually believed to be mainly determined by material properties. Therefore, nanocrystalline common-mode inductors are typically used at frequencies below several tens of kilohertz. This letter proposes an inductor with a 2-D core and origami winding to increase the first f_R without changing the material. Especially, for nanocrystalline, the proposed 2-D structure increases the first f_R to over 10 MHz and preserves the high permeability of nanocrystalline. Furthermore, this proposed 2-D structure also sharply reduces near-field radiation and enhances heat dissipation. Applying the proposed inductor in an electromagnetic interference filter with a boost converter verifies the effectiveness of our proposed inductor. © 2024 IEEE.