Magnetics Optimization (Part 4): Minimization Of Transductor Power Loss

Focus:

Maximum power transfer (i.e. max efficiency, η) is not the only design criterion for transformers and coupled inductors (aka transductors). Another important form of optimization is the minimization of power loss, Pt. In this part 4, minimum-Pt optimization is derived and compared to maximum η to arrive at an overall optimization method. But first, the article reviews why, for a given number of turns, N, the equal loss criterion does not lead to minimum- Pt and why achieving minimum-Pt does not result in maximum η. Then this article shows why any attempt to minimize Pt must account for the interdependency of the winding and core resistances. It then derives the power loss ratio corresponding to minimum-Pt and relate this to maximum η. The last section discusses strategies for achieving maximized η using plots based on resistance and voltage ratios.

What you’ll learn:

• How to understand why minimum power loss and maximum efficiency do not coincide in transformers and coupled inductors
• How to minimize power losses in transformers and coupled inductors
• How to develop a balanced strategy for maximizing efficiency and minimizing power losses in transformers and coupled inductors

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Author & Publication:

Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, May 16 2017

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