DocumentCode :
3737236
Title :
Optimization of the compensation capacitors for megahertz wireless power transfer systems
Author :
Zefan Tang;Minfan Fu;Ming Liu;Chengbin Ma
Author_Institution :
University of Michigan - Shanghai Jiao Tong University Joint Institute Shanghai, China
fYear :
2015
Firstpage :
1447
Lastpage :
1452
Abstract :
A wireless power transfer system can increase its system frequency to several Megahertz for large spatial freedom. A MHz system usually uses the same compensation as those kHz systems. Traditionally, the rectifier is modeled as a pure resistive load for the coupling coils when designing the compensation capacitors. However, the rectifier input reactance cannot be ignored for MHz systems. This reactance can affect the system resonance and is usually not considered when designing the compensation capacitors. This paper analyzes the rectifier input impedance and discusses its undesirable effects. A non-zero phase is shown to exist seeing into the coupling coils for MHz WPT system. In order to limit the phase, the optimal compensation capacitors are discussed and found. Finally, a 6.78 MHz system is used to verify the proposed optimal compensation method. It shows the phase variation can be limited from the original range [15°-35°] to the optimal range [-5°-5°].
Keywords :
"Coils","Capacitors","Couplings","Integrated circuit modeling","Load modeling","Impedance","Resistance"
Publisher :
ieee
Conference_Titel :
Industrial Electronics Society, IECON 2015 - 41st Annual Conference of the IEEE
Type :
conf
DOI :
10.1109/IECON.2015.7392304
Filename :
7392304
Link To Document :
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