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Decentralized Interleaving of Cascaded H-Bridge Multi-Level Converters

This document proposes a simple method to decentralize the interleaving for cascaded H bridge (CHB) converters. In the proposed approach, a single signal sent from the Central controller (CC) to Local Controllers (LC) contains information about the desired pulse width and is synchronized with respect to other LC. While centralized controllers need individual signals for each of the CHB modules, the proposed method requires a single signal per phase which decreases the number of PWM channels needed. A detailed explanation of the proposed method is presented. Experimental results are presented that show the interleaving of two CHB modules for an example DC to AC application.