Modeling of Integrated Magnetics Components
by Mark Christini, Ansoft Corporation, Pittsburgh, PA, USA; Roberto Prieto, Universidad Politecnica de Madrid (UPM), Madrid, Spain, How2Power Today, Mar 30 2010
Focus:
Integrated magnetics, the building of transformers and inductors on the same magnetic core,
allow designers to reduce component size, losses, and flux ripple. However, the design of
integrated magnetic components is not trivial because the selection of the core, air gaps and
winding setup is not obvious. Ansoft's PExprt software is capable of creating accurate models
for these complex components, allowing the designer to select the appropriate winding strategy
without time-consuming prototyping iterations. PExprt uses finite element analysis (FEA)
techniques to generate frequency-dependent models of integrated magnetic components, which
include the materials and winding layout. This article demonstrates how to use PExprt to model
a push-pull forward converter with integrated magnetics for a 48-V Voltage Regulator Module
with a 1.2-V and 70-A output. The article begins by describing PExprt's 2D approach to FEA and
its generic model structure. Then, step-by-step procedures are given for generating an example
component model and then the example model is exported to Simplorer for simulation of the VRM
design. Finally, the simulated results are compared with measured results.
What you’ll learn:
- How to generate frequency-dependent models of integrated magnetic components using PExprt
- How to model a push-pull forward converter with integrated magnetics
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