Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Compact Wireless IPT System Using a Modified Voltage-fed Multi-resonant Class EF2 Inverter

  • Uddin, Mohammad Kamar (Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya) ;
  • Mekhilef, Saad (Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya) ;
  • Ramasamy, Gobbi (Faculty of Engineering, Multimedia University)
  • Received : 2017.02.07
  • Accepted : 2017.05.30
  • Published : 2018.01.20
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Abstract

Wireless inductive power transfer (IPT) technology is used in many applications today. A compact and high-frequency primary side inverter is one of the most important parts of a WPT system. In this study, a modified class EF-type voltage-fed multi-resonant inverter has been proposed for WPT application at a frequency range of 85-100 kHz. Instead of an infinite input choke inductor, a resonant inductor is used to reduce loss and power density. The peak voltage stress across the MOSFET has been reduced to almost 60% from a class-E inverter using a passive clamping circuit. A simple yet effective design procedure has been presented to calculate the various component values of the proposed inverter. The overall system is simulated using MATLAB/SimPowerSystem to verify the theoretical concepts. A 500-W prototype was built and tested to validate the simulated results. The inverter exhibited 90% efficiency at nearly perfect alignment condition, and efficiency reduced gradually with the misalignment of WPT coils. The proposed inverter maintains zero-voltage switching (ZVS) during considerable load changes and possesses all the inherent advantages of class E-type inverters.

Keywords

Acknowledgement

Supported by : University of Malaya, Fundamental Research Grant Scheme (FRGS)

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