Shielded Capacitive Power Transmission (S-CPT) System Using Cast Iron

Eiichi Tateishi (), Hao Chen, Naoki Kojo, Yuta Ide, Nobuhiro Kai, Toru Hashimoto, Kota Uchio, Tatsuya Yamaguchi, Reiji Hattori and Haruichi Kanaya
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Eiichi Tateishi: Graduate School of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0385, Japan
Hao Chen: Graduate School of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0385, Japan
Naoki Kojo: Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
Yuta Ide: Hinode Holdings Ltd., Fukuoka 812-8636, Japan
Nobuhiro Kai: Hinode Holdings Ltd., Fukuoka 812-8636, Japan
Toru Hashimoto: Hinode Holdings Ltd., Fukuoka 812-8636, Japan
Kota Uchio: Hinode Holdings Ltd., Fukuoka 812-8636, Japan
Tatsuya Yamaguchi: Hinode Ltd., Fukuoka 812-8636, Japan
Reiji Hattori: Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
Haruichi Kanaya: Graduate School of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0385, Japan

Energies, 2025, vol. 18, issue 19, 1-20

Abstract: In this study, we investigate a shielded capacitive power transfer (S-CPT) system that employs cast iron road covers as transmission electrodes for both dynamic and static charging of electric vehicles. Coupling capacitance was evaluated from S-parameters using copper, aluminum, ductile cast iron, structural steel, and carbon steel electrodes, with additional comparisons of ductile iron surface conditions (casting, machining, electrocoating). In a four-plate S-CPT system operating at 13.56 MHz, capacitance decreased with electrode spacing, yet ductile cast iron reached ~70 pF at 2 mm, demonstrating a performance comparable to that of copper and aluminum despite having higher resistivity and permeability. Power transmission experiments using a Ø330 mm cast iron cover meeting road load standards achieved 58% efficiency at 100 W, maintained around 40% efficiency at power levels above 200 W, and retained 45% efficiency under 200 mm lateral displacement, confirming robust dynamic performance. Simulations showed that shield electrodes enhance grounding, stabilize potential, and reduce return-path impedance. Finite element analysis confirmed that the ductile cast iron electrodes can withstand a 25-ton design load. The proposed S-CPT concept integrates an existing cast iron infrastructure with thin aluminum receiving plates, enabling high efficiency, mechanical durability, EMI mitigation, and reduced installation costs, offering a cost-effective approach to urban wireless charging.

Keywords: wireless power transfer; capacitive power transfer; dynamic wireless charging; electric vehicle charging; cast-iron electrodes (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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