Gate Drive and Protection of Three-Level Inverters

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  • Author: Jonathan Dodge, P.E.
There are multiple variants of three-level neutral point clamped inverters. Most are derivatives of two circuit topologies:one with four series-connected FETs and two clamp diodes, the other with two series-connected FETs and two clamp FETs. Of concern is how to safely drive and control the series-connected FETs as well as how to handle fault conditions, including a short circuit. This is explained in this note, in addition to a discussion of overall operation and how it relates to gate driving.
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