Open AccessMisalignment tolerance wireless power transfer system combining inductive and capacitive coupling
Author(s) -
Luo Bo,
Zhou Xingyu,
Long Tao,
Mai Ruikun,
He Zhengyou
Publication year - 2020
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.815
H-Index - 97
eISSN - 1751-8679
pISSN - 1751-8660
DOI - 10.1049/iet-epa.2019.0874
Subject(s) - wireless power transfer , maximum power transfer theorem , inductive coupling , capacitive sensing , coupling (piping) , capacitive coupling , electrical engineering , wireless , power (physics) , resonant inductive coupling , energy transfer , electronic engineering , computer science , engineering , physics , telecommunications , mechanical engineering , engineering physics , voltage , quantum mechanics
To resonate with the capacitive power transfer (CPT) system, inductors are usually needed, while additional capacitors are required for the inductive power transfer (IPT) system. To take advantage of the inductance of the IPT system, this study proposes a misalignment tolerance wireless power transfer system that employs the IPT coupler to compensate part of CPT's capacitance for railway applications. In the proposed system, two power transfer paths are formed by the IPT and CPT couplers. Additionally, the system merits a good anti‐misalignment ability by carefully designing the parameters of the proposed system. In a well‐alignment case, only the CPT coupler is utilised to transfer power. While in misalignment case, the IPT coupler is activated to transfer power to improve the misalignment tolerance. Besides, the transfer capability of the combined system can be improved when the misalignment happens. The system coupler, connection method and output power characteristics are presented in detail. Then, the general design procedure is provided with an example system at 1 kW. Experimental results show that the maximum variation of the output is 5.6% when misalignment is up to 250 mm (50%). While the power variation of the system involving single CPT can be as large as 52%.