How To Model Coupled Inductors In A SEPIC Converter

Focus:

Converter designs based on the single-ended primary inductance converter (SEPIC) topology often opt to use a coupled inductor both to reduce the number of components and overall converter size, and to simplify control. However, this design choice complicates simulation: If the coupled inductor is not modeled correctly, the simulated result can be quite different from the bench result. This article discusses how to best model coupled inductors in a SEPIC design. Methods to build a proper model are introduced, the equations are included and a design example is presented.

What you’ll learn:

• How to model coupled inductors in LTspice for simulation of SEPIC converters

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Author & Publication:

Wei Gu, Analog Devices, San Jose, Calif., How2Power Today, Feb 14 2025

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