A Nine-Switch-Converter-Based Integrated Motor Drive and Battery Charger System for EVs Using Symmetrical Six-Phase Machines

Mohamed S. Diab, Ahmed A. Elserougi, Ayman Abdel-Khalik, Ahmed M. Massoud, Shehab Ahmed

Research output: Contribution to journalArticle

59 Citations (Scopus)


This paper presents a new configuration for integrated on-board battery chargers of electric vehicles (EVs) incorporating symmetrical six-phase machines. The configuration proposes an exclusive utilization of a nine-switch converter (NSC) along with the machine windings during both propulsion and charging of EVs. The proposed configuration has the advantage of employing a reduced number of components in both the EV (on-board) and charging station (off-board), with the privilege of avoiding machine electromagnetic torque production during charging/vehicle-to-grid (V2G) mode of operation. During charging/V2G mode, the NSC is turned into a conventional three-phase pulse width modulation rectifier and is directly connected to the three-phase mains through the machine windings. Conventional three-phase transformers can be employed for galvanic isolation. Switching between propulsion and charging modes is carried out using a simple hardware reconfiguration. Control schemes for both propulsion and charging/V2G modes are elaborated, along with the principles of operation of the NSC. Experimental results are provided to validate the theoretical deductions for the different operating modes.

Original languageEnglish
Article number7454736
Pages (from-to)5326-5335
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number9
Publication statusPublished - 1 Sep 2016



  • Grid-connected vehicles
  • integrated on-board chargers
  • nine-switch converter (NSC)
  • symmetrical six-phase machines

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering

Cite this