Multilevel DC-link inverter

Gui Jia Su

doi:10.1109/TIA.2005.847306

Multilevel DC-link inverter

Gui Jia Su

Electric Drives Research

Research output: Contribution to journal › Article › peer-review

391 Scopus citations

Abstract

This paper presents a new class of multilevel inverters based on a multilevel dc link (MLDCL) and a bridge inverter to reduce the number of switches, clamping diodes, or capacitors. An MLDCL can be a diode-clamped phase leg, a flying-capacitor phase leg, or cascaded half-bridge cells with each cell having its own dc source. A multilevel voltage-source inverter can be formed by connecting one of the MLDCLs with a single-phase bridge inverter. The MLDCL provides a dc voltage with the shape of a staircase approximating the rectified shape of a commanded sinusoidal wave, with or without pulsewidth modulation, to the bridge inverter, which in turn alternates the polarity to produce an ac voltage. Compared with the cascaded H-bridge, diode-clamped, and flying-capacitor multilevel inverters, the MLDCL inverters can significantly reduce the switch count as well as the number of gate drivers as the number of voltage levels increases. For a given number of voltage levels m, the required number of active switches is 2 × (m - 1) for the existing multilevel inverters but is m + 3 for the MLDCL inverters. Simulation and experimental results are included to verify the operating principles of the MLDCL inverters.

Original language	English
Pages (from-to)	848-854
Number of pages	7
Journal	IEEE Transactions on Industry Applications
Volume	41
Issue number	3
DOIs	https://doi.org/10.1109/TIA.2005.847306
State	Published - May 2005

Funding

Paper IPCSD-05-008, presented at the 2004 Industry Applications Society Annual Meeting, Seattle, WA, October 3–7, and approved for publication in the IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS by the Industrial Power Converter Committee of the IEEE Industry Applications Society. Manuscript submitted for review October 15, 2004 and released for publication February 25, 2005. This work was supported by the Oak Ridge National Laboratory, managed by UT-Battelle for the U.S. Department of Energy under Contract DE-AC05-00OR22725.

Keywords

Cascaded half bridge
Diode clamped
Flying capacitor
Muitilevel inverter
Multilevel dc link
Reduced part count

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10.1109/TIA.2005.847306

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title = "Multilevel DC-link inverter",

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Multilevel DC-link inverter

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