Excellent Tunable DC Bias Superposition Characteristics for Manganese–Zinc Ferrites

Manganese-zinc (MnZn) power ferrites own significant applications in inductors and transformers for power conversion. The performance of these components is dependent on permeability, saturation induction, core losses, and dc bias superposition characteristics of MnZn ferrites. It is worth emphasizing that excellent dc bias superposition characteristics of ferrites are beneficial for the stability and efficiency of power converters operated with both ac and dc signals. In this paper, Co
₂
O
₃
-doped MnZn ferrites are fabricated using a solid-state reaction method and used to investigate dc bias superposition characteristics of permeability and core losses. More importantly, the physical mechanism of the dc bias superposition characteristics is clarified. Furthermore, the effect of Co
₂
O
₃
doping on the efficiency of buck circuit was also investigated. The dc bias superposition characteristics suggests potential application in power components and systems.