Designing An Open-Source Power Inverter (Part 3): Power-Transfer Circuit Options

Focus:

In this part of the series, various candidates for the inverter’s converter-stage (battery converter) power-transfer circuit are reviewed, the optimal circuit is chosen, and design equations are developed for it. In addition to addressing the requirements of the Volksinverter design that is the focus of this series, this discussion is also intended as a general tutorial on how to evaluate power transfer circuits for power inverter applications. Although the Volksinverter design assumes a two-stage scheme consisting of a battery converter and an inverter (a PWM’d H-bridge), this article also considers alternatives such as waveform generators. Then in evaluating options for the battery converter, push-pull, boost push-pull, and SEPIC topologies are compared. Finally, limitations of the boost push-pull as a waveform generator are explored, leading to another circuit option.

What you’ll learn:

• How to evaluate power transfer circuits (topologies) for power inverter applications

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Author & Publication:

Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Apr 15 2022

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