Designing An Open-Source Power Inverter (Part 21): Converter Inductor Winding Design
by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Nov 15 2024
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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