A Simplified Three-order Small-signal Model for Capacitive Power Transfer System Using Series Compensation

Capacitive power transfer is promising for highefficiency wireless charging. A small-signal model is required to evaluate the system stability under different control approaches. This paper focuses on the modeling and simplification of the highorder system using series compensation. Based on the ext...

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Bibliographic Details
Published inIEEE transactions on power electronics Vol. 38; no. 5; pp. 1 - 11
Main Authors Qi, Chaoqun, Zheng, Guangce, Liu, Yu, Liang, Junrui, Wang, Haoyu, Fu, Minfan
Format Journal Article
LanguageEnglish
Published New York IEEE 01.05.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Capacitive power transfer
Capacitors
Compensation
Equivalent circuits
extended describing function
Inductors
Integrated circuit modeling
Inverters
Load modeling
Rectifiers
Resonant frequency
series compensation
small signal model
Stability analysis
Systems stability
Transfer functions
Wireless power transmission
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Summary:Capacitive power transfer is promising for highefficiency wireless charging. A small-signal model is required to evaluate the system stability under different control approaches. This paper focuses on the modeling and simplification of the highorder system using series compensation. Based on the extended describing function method, this paper proposes a series of model transformation and approximation to effectively reduce the circuit order of the resonant tank. The number of resonant components is reduced from ten to two. Combining with the inverter and rectifier model, a third-order equivalent circuit model is firstly derived for the whole system with clear physical meaning and explicit transfer function. The experiment results show the model is accurate up to 1/5 of the switching frequency.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2023.3243134