Designing An Open-Source Power Inverter (Part 21): Converter Inductor Winding Design

Focus:

This installment in the series explore the Volksinverter’s battery converter stage further, continuing the design of the inductor of the boost push-pull (BPP) transfer circuit. A two-winding coupled inductor, the boost or common-active (CA) PWM-switch inductor is the only power-transfer component (along with the fuse and connectors) that is in series with the battery and conducts the most current of all the Volksinverter circuitry. The procedure for magnetic component design begins logically with the magnetic design—the design associated with the core—for without it, there is nothing on which to base the winding (electrical) design. The previous part in this series presented the magnetic design, which is reviewed here, establishing key parameters such as Lmin, the minimum inductance needed for current protection; Lmax, the maximum inductance and energy storage (or transfer power) value at Igmax and Nmax; and Nw, the maximum turns that fit the core window. Previously discussed techniques for optimizing coupled inductor or transformer design are applied here.

What you’ll learn:

• How to do the winding design for a coupled inductor with the objective of maximum power density
• How to design a coupled inductor for a boost push-pull (BPP) transfer circuit

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Author & Publication:

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

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