Compact Wireless IPT System Using a Modified Voltage-fed Multi-resonant Class EF2 Inverter

Mohammad Kamar Uddin; Saad Mekhilef; Gobbi Ramasamy

Compact Wireless IPT System Using a Modified Voltage-fed Multi-resonant Class EF2 Inverter

Mohammad Kamar Uddin

Saad Mekhilef

Gobbi Ramasamy

Vol. 18, No. 1, pp. 277-288, Jan. 2018

10.6113/JPE.2018.18.1.277

Class E inverter

Class EF inverter

High-frequency inverter

Inductive power transfer

Misalignment tolerance

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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.

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Cite this article

[IEEE Style]

M. K. Uddin, S. Mekhilef, G. Ramasamy, "Compact Wireless IPT System Using a Modified Voltage-fed Multi-resonant Class EF2 Inverter," Journal of Power Electronics, vol. 18, no. 1, pp. 277-288, 2018. DOI: 10.6113/JPE.2018.18.1.277.

[ACM Style]

Mohammad Kamar Uddin, Saad Mekhilef, and Gobbi Ramasamy. 2018. Compact Wireless IPT System Using a Modified Voltage-fed Multi-resonant Class EF2 Inverter. Journal of Power Electronics, 18, 1, (2018), 277-288. DOI: 10.6113/JPE.2018.18.1.277.