Designing An Open-Source Power Inverter (Part 20): Converter Inductor Magnetic Design

Focus:

The final magnetic component in the Volksinverter that remains to be designed is the converter-stage inductor of the boost push-pull (BPP) transfer circuit--a two-winding coupled inductor. The design procedure followed is the generalized transductor design procedure introduced in part 15 for the transformer in the BPP stage. As with the transformer, this coupled inductor design begins with the magnetic design, establishing those parameters relating to selection of the core and the number of turns, N. However, the inductor design begins with two additional considerations—the overcurrent limits which set a minimum value for inductance, and the turns ratio of the BPP transformer, which is applied to the coupled inductor. With those constraints established, the article discusses the factors determining inductor core material and shape, and the limits on N imposed by the thermal models for core and windings, as well as the limits due to core saturation. These various constraints are applied to determine the optimal number of turns for the selected core and for alternative core options.

What you’ll learn:

• How to select a core and optimal number of turns for a coupled inductor in a boost push-pull power transfer circuit
• How to allot space in the inductor winding window to primary and secondary windings of a coupled inductor

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Author & Publication:

Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Oct 15 2024

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