An Improved PWM Technique to Achieve Continuous Input Current in Common-Ground Transformerless Boost Inverter

Sze Sing Lee*, Yam P. Siwakoti, Chee Shen Lim, Kyo Beum Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


A latest common-ground transformerless inverter for photovoltaic (PV) system has demonstrated its superiority over its existing counterpart due to its merits of single-stage structure and voltage boost capability. The exploited modulation scheme, however, led to discontinuous input current that draws high peak current from the source and causes high input power fluctuation in the converter. Such discontinuous and high peak current are detrimental to the PV source. Addressing this concern, this brief proposes a new modulation technique that achieves continuous input current with reduced peak magnitude while in the meantime ensures a good quality ac output voltage. Simulation and experimental results of a laboratory prototype are provided to verify the effectiveness of the proposed modulation technique.

Original languageEnglish
Article number8962955
Pages (from-to)3133-3136
Number of pages4
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number12
Publication statusPublished - Dec 2020
Externally publishedYes


  • Common-ground
  • PWM technique
  • continuous input current
  • transformerless inverter
  • voltage-boosting

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