Robust Wireless Power Transfer for EVs by Self-Oscillating Controlled Inverters and Identical Single-Coil Transmitting and Receiving Pads

Alireza Eikani, Mohammad Amirkhani, Ehsan Farmahini Farahani (), Volker Pickert, Mojtaba Mirsalim and Sadegh Vaez-Zadeh
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Alireza Eikani: Advanced Motion Systems Research Laboratory, School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran 1439957131, Iran
Mohammad Amirkhani: Electrical Machines and Transformers Research Laboratory (EMTRL), Department of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran 1591634311, Iran
Ehsan Farmahini Farahani: Electrical Power Research Group, School of Engineering, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
Volker Pickert: Electrical Power Research Group, School of Engineering, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
Mojtaba Mirsalim: Electrical Machines and Transformers Research Laboratory (EMTRL), Department of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran 1591634311, Iran
Sadegh Vaez-Zadeh: Advanced Motion Systems Research Laboratory, School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran 1439957131, Iran

Energies, 2025, vol. 18, issue 1, 1-21

Abstract: Inductive wireless power transfer (IWPT) with stable output power and high efficiency is a major challenge for charging electric vehicles (EVs). This paper, for the first time, develops a robust IWPT system using a circular pad (CP) and double-D pad (DDP) with a self-oscillating controlled inverter (SOCI), which offers high steady output power and transfer efficiency under magnetic coupling variations simply with feedback from the transmitter-side current. The compact 2CP and 2DDP magnetic couplers with single identical coils are robust to self- and mutual-inductance variations, so the IWPT system exhibits greater robustness at increased transfer distances (air gaps), as well as in the presence of lateral and rotational misalignments between the two magnetic pads, compared to couplers using nonidentical transmitting primary (TP) and receiving secondary (RS) pads and numerous decoupled coils on the RS pad. Based on a thorough analysis and experimental study, the proposed 1 kW IWPT system with 2CP and 2DDP couplers with up to a 20 cm air gap achieves constant output power with 93% and 92% constant transfer efficiency, respectively. The 2CP with a 15 cm air gap and the 2DDP with a 20 cm air gap, with up to 12 cm lateral misalignment, can tolerate coupling variations.

Keywords: circular pad (CP); double-D pad (DDP); magnetic coupling coefficient; robust wireless power transfer (WPT); self-oscillating controlled inverter (SOCI) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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