Double-sided LC-compensated capacitive wireless power transfer system with admittance-based matching networks

• Published in: JOURNAL OF POWER ELECTRONICS Vol. 24; no. 4; pp. 652 - 661
• Main Authors: Yi, Lifang, Moon, Jinyeong
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.04.2024; 전력전자학회
• Subjects: Electrical Machines and Networks; Engineering; Original Article; Power Electronics; 전기공학; Admittance; Misalignment; Wireless power transfer; Capacitive WPT
• ISSN: 1598-2092; 2093-4718
• DOI: 10.1007/s43236-023-00742-9

Designing a capacitive wireless power transfer system is challenging due to the variable coupling capacitance caused by the physical misalignment of the plates of the coupling capacitor. This paper presents a double-sided LC-compensated capacitive wireless power transfer system. An admittance-based matching network design is proposed and analyzed in detail. The proposed approach exhibits excellent constant output power subject to physical misalignment. Furthermore, this technique suppresses other fluctuations in the circuit parameters and responses during coupling variations. Two matching networks designed with the admittance-based approach are utilized to maintain the constant equivalent input admittance of the system. Mathematical models are derived to analyze the characteristics of the proposed topology. The parameter design method is also provided to achieve the required compensation range. The proposed approach offers a comprehensive and general approach to addressing the challenges posed by physical misalignment and paves the way for practical implementations. Finally, a prototype is built based on a 2 MHz design example to verify the theoretical analysis.