Ceramic Multilayer Integration of Power Electronic Inductors

Abstract

New MnZn and NiZnCu ferrites for low temperature co-fired ceramics technology are driving investigations on design rules of integrated power electronic inductors and transformers. Their magnetic properties and impact on device performance are described in the following with particular emphasis on MnZn ferrite and basic transformer structures comprising a pure ferrite multilayer, a dielectric multilayer with ferrite cladding, and a dielectric multilayer with closed ferrite core. While the monolithic embedded version exhibits low magnetic coupling and power capacity, the gap and the core design achieve more than 100 W transmitted power per cm 3 device volume at 90% efficiency.