Circuit Configuration and Modulation of a Seven-Level Switched-Capacitor Inverter

Aryorad Khodaparast, Mohammadjavad Hassani, Erfan Azimi, M. Ebrahim Adabi, Jafar Adabi, Edris Pouresmaeil

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)
131 Downloads (Pure)

Abstract

In this article, a step-up seven-level inverter supplied by a single dc source suitable for renewable energy application is presented. Forming the desired output is realized by charging capacitors and synthesizing them based on a switched-capacitor concept. This structure is praised for the ability of sensorless voltage balancing of the capacitors, reducing control complexity to produce a bipolar staircase waveform. It also benefits from regenerative performance, avoiding unwanted capacitors overvoltage. A phase disposition pulsewidth modulation (PD-PWM) technique is utilized to control the circuit operation. Furthermore, a comparison with other recent topologies reveals that losses, number of semiconductor devices, and gate driver circuits are reduced. Theoretical analysis is verified through a laboratory prototype implementation. Experimental results under various types of loads approve the performance of the proposed inverter and validity of the design. Finally, maximum experimental efficiency of 94.3% (115 V, 250 W load) was reached.

Original languageEnglish
Article number9250604
Pages (from-to)7087-7096
Number of pages10
JournalIEEE Transactions on Power Electronics
Volume36
Issue number6
DOIs
Publication statusPublished - 6 Nov 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Multilevel inverter
  • Single-source
  • Switched-capasitor
  • Step-up converter
  • Self-balancing

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