Ripple Steering Can Enhance Magnetics Circuit Function Through Ripple Reduction

Focus:

Elimination of current ripple in transductor (transformer or coupled inductor) windings is an ideal in converter design, and current-ripple “steering” essentially accomplishes it. The behavior of the transductor is central to an understanding of current steering and this article explains this behavior using a simple model. Then, it is shown that ripple steering is not only applicable to Ćuk-derived converters, but also to any of the basic PWM-switch converter configurations—buck, boost, or buck-boost. Finally, this article discusses tradeoffs in implementing ripple steering and how a slight variation—one which does not eliminate ripple but instead reduces it—represents a more-practical application of this decades-old concept.

What you’ll learn:

• How to understand the role of the transformer or coupled inductor in ripple current steering in Cuk converters
• How to understand the applicability of ripple steering to both Cuk and non-Cuk power supply topologies
• How to use ripple current steering for ripple reduction rather than ripple elimination

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Author & Publication:

Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Jul 15 2014

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