Open AccessHybrid coupler for 6.78 MHz desktop wireless power transfer applications with stable open‐loop gain
Author(s) -
Chen Xu,
Yu Shengbao,
Song Shuchao,
Li River T.H.,
Yang Xiaobo,
Zhang Zhe
Publication year - 2019
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2018.6199
Subject(s) - hybrid coupler , wireless power transfer , maximum power transfer theorem , capacitance , open loop gain , capacitive sensing , electrical engineering , power (physics) , coupling (piping) , wireless , electronic engineering , inductive coupling , laptop , loop (graph theory) , open loop controller , capacitive coupling , computer science , engineering , topology (electrical circuits) , voltage , power dividers and directional couplers , physics , closed loop , telecommunications , automatic gain control , mathematics , amplifier , cmos , operating system , quantum mechanics , mechanical engineering , electrode , combinatorics , control engineering
The open‐loop gain of capacitive power transfer (CPT) circuit, especially for applications like wireless charging of laptop or keyboard, is sensitive to the changes of coupling capacitance, which makes the regulating of output voltage and output power difficult. Hybrid coupler has been proved to be able to combine the advantages of both inductive power transfer (IPT) and CPT. In this study, a hybrid coupler is designed with the aim of keeping a stable open‐loop gain when the coupling capacitance changes. The structure as well as the operation principles of the hybrid coupler is explained firstly. Then, the open‐loop gains of CPT, IPT and hybrid wireless power transfer (HWPT) are derived and followed by a simplified design guideline of the whole HWPT system using the proposed hybrid coupler. Finally, the proposed coupler is verified with a 40 W, 6.78 MHz experimental prototype.