Voltage Tunable Magnetoelectric Inductors with Improved Operational Frequency and Quality Factor for Power Electronics

Abstract

Abstract„Inductors find widespread use in various applications. Inductors with a large tunability of inductance and quality factor would lead to new paradigm on circuit designs. In this paper, we investigated the effect of ferromagnetic layer thickness on the performance of a magnetoelectric tunable inductor. By using chemical etching, the thickness of Metglas ribbons (2605SA1) can be reduced to from 24?m to about 8?m, which dramatically reduces the eddy current loss at higher frequencies. With the same total thickness, compared to inductor constructed with unthinned Metglas layers (2605CO»), the maximum quality factor can be increased for 80 %, and the operational frequency range can be extended for 10_ to the >10 MHz range. An inductance tunable range of Lmax/Lmin = 370% was also achieved together with an significantly enhanced quality factor by ~ 3_; Furthermore, inductor constructed with single thin Metglas (2605HB1M) layer, the maximum quality factor can be increased by 150 % with single PZT slab and by 235% with double PZT slabs, and the operational frequency range can be extended by 100_ with single slab and by 200_ with double slabs, which makes these metallic magnetic ribbons tunable inductors competitive with ferrite materials in adaptive inductive power supply systems.