Abstract
This paper presents the analysis and design of four-windings coupled inductors for minimum current ripple in a non-isolated DC-DC conversion scheme. Based on the general circuit model of a four-windings coupled inductors and the operating principles of dc-dc converter, the relationship between the ripple of inductors currents and coupling factor was derived as a function of the duty ratio and then a generalized expression of the equivalent inductance of each winding is calculated. The magnetic coupling of output or input inductance is utilized to reduce the peak-to-peak current ripple of the inductors. ANSYS Maxwell software in co-simulation with ANSYS Simplorer and MATLAB Simulink are used to validate the design a UI core based coupled inductors structure for 16 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{kW}$</tex> battery charger application. The theoretical model of the proposed coupled inductors was confirmed through simulation tests showing the high performance in terms of current ripple and power density of the designed coupled inductors.
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