Multilevel inverters have been proven to be viable solutions for high-power automotive motor drive applications due to their high volt-ampere ratings. Cascaded H-bridge inverters are a promising breed of multilevel inverters which generally require several independent dc sources. Replacement of all but one of the dc sources with capacitors in cascaded H-bridge multilevel inverters, which leads to single-dc-source per-phase cascaded inverters, has recently gained popularity. However, very few efforts have been made to address the challenging problem of voltage regulation in the replacing capacitors. In this paper, applicability of a real-time voltage control technique named unbalanced voltage level sigma-delta modulation technique to provide voltage regulation across the replacing capacitors is examined. In addition, a new voltage ratio for the H-bridge cells is introduced, which simplifies the control tasks. Analytical and simulation results prove the effectiveness of the proposed scheme.

Meeting Name

IEEE Vehicle Power and Propulsion Conference, 2008


Electrical and Computer Engineering

Keywords and Phrases

H-Bridge Multi-Level Inverter; Delta-Sigma Modulation; Invertors; Power Capacitors; Voltage Control; Voltage Regulation; Bridge circuits; Spectrum analysis

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2008 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.