The Impact of Inverter Dead-Time in Single-Phase Wireless Power Transfer Systems

Utkarsh Kavimandan, Veda Prakash Galigekere, Burak Ozpineci, Omer Onar, Satish Mahajan

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

In this article, the effect of the dead-time on a single-phase wireless power transfer (WPT) system is studied in detail. In practice, the dead-time is always placed between the complementary switching pulses of the inverter phase-leg. At higher operating frequencies, the dead-time issues in the resonant inverter become critical, especially as the power level increases. The detailed analysis of the dead-time on a WPT system is discussed for different operating conditions of the inverter duty-cycle and power factor. The switching characteristics of the WPT system inverter are analyzed, and the notch phenomenon that appears at the output of the inverter is also discussed. A notch equation based on the observations is derived to predict the notch occurrence during the system operation. Furthermore, the mathematical expressions are presented for different notch conditions. Subsequently, the effect of the notches on the sensitivity and the power transfer of the series-series compensated WPT system is analyzed. Finally, the approach is verified experimentally on an 8-kW WPT system prototype, and the results are compared with the theoretical analysis.

Original languageEnglish
Pages (from-to)1074-1089
Number of pages16
JournalIEEE Transactions on Power Electronics
Volume37
Issue number1
DOIs
StatePublished - Jan 2022

Funding

Manuscript received March 9, 2021; accepted April 28, 2021. Date of publication June 25, 2021; date of current version September 16, 2021. This research used resources available at the Power Electronics and Electric Machinery Laboratory located at the National Transportation Research Center, a DOE EERE User Facility operated by the Oak Ridge National Laboratory (ORNL). This work was supported by DOE VTO Lab Call Project 3B on High Power and Dynamic Wireless Power Transfer. Recommended for publication by Associate Editor D. Qiu. (Corresponding author: Omer Onar.) Utkarsh D. Kavimandan and Satish M. Mahajan are with the Electrical and Computer Engineering Department, Tennessee Technological University, Cookeville, TN 38505 USA (e-mail: [email protected]; [email protected]). This research used resources available at the Power Electronics and Electric Machinery Laboratory located at the National Transportation Research Center, a DOE EERE User Facility operated by the Oak Ridge National Laboratory (ORNL).

Keywords

  • Dead-time
  • notch
  • sensitivity analysis
  • voltage polarity reversal (VPR)
  • wireless power transfer (WPT)

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