Rediscovering The Integrated-Magnetics Isolated Ćuk Topology

Focus:

Although much has been written about Cuk-derived converters, there are still many misconceptions regarding this class of topologies and the design considerations are generally not well understood. For instance, the claim that Cuk-derived converters are free of ripple current on the converter's input and output is only conditionally true. Another point that designers should understand is that a flyback converter with primary and secondary ripple-current steering is equivalent to the isolated Cuk converter. In addition, there are certain figures-of-merit that play an important role in optimizing the performance of Cuk-derived converters. In this article, all of these issues are discussed and one of the most underutilized of these converters---the magnetically-integrated IsoCuk (IMIC) converter-is discussed. The operation of this converter is explained and its design considerations are discussed.

What you’ll learn:

• How to understand the operation and performance benefits of the magnetically-integrated IsoCuk (IMIC) converter
• How to design power converters based on the magnetically-integrated IsoCuk topology
• How to optimize performance of Cuk-derived converters

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Author & Publication:

Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Jul 30 2010

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