Abstract
This paper presents a planar nonlinear coupled inductor for improving light load efficiency of DC/DC converters. The nonlinear coupled inductor features higher self-inductance value and lower coupling coefficient at light load. Three layers, formed by magnetic materials with two kinds of permeability, are used to make the nonlinear coupled inductor. The nonlinearity is controlled by the permeability and thickness of the high-permeability center plate. Finite element analysis (FEA) is employed to design the nonlinear coupled inductor by sweeping the conductor width and middle layer thickness. The coupled inductor structure as well as its influence on the inductance value is also analyzed in this paper. Two prototypes with two permeability distribution are made to test the performances and they achieve high light load efficiency. Compared with the conventional constant coupling coefficient inductor, the nonlinear coupled inductor has higher efficiency at light load.
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