Determining Maximum Usable Switching Frequency For Magnetics In CCM-Operated Converters

Focus:

Power converter size limitations require that magnetic components be made as small as possible while delivering the specified output power. The goal of this article is to develop design constraints for the optimum switching frequency that produces maximum core power transfer within acceptable power loss for converters operating deep in continuous conduction mode (CCM.) These include buck-boost (common inductor), flyback and Cuk-derived circuits. The analysis determines the frequency-dependent factors that determine losses in transformers and coupled inductors and ultimately derives an equation for optimizing the selection of core material for maximizing the ratio of transfer power relative to power loss.

What you’ll learn:

• How to determine the maximum switching frequency that will produce maximum core power transfer within acceptable power loss for transformers and coupled inductors in power converters operating in continuous conduction mode

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Author & Publication:

Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Apr 16 2015

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