期刊
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
卷 9, 期 3, 页码 3802-3811出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2019.2917708
关键词
Resonators; Resonant frequency; Coils; Couplings; Impedance; Design methodology; Relays; Free resonant frequency; impedance matching; inductive link; power transfer efficiency (PTE); three-coil wireless power transfer (WPT) system; wireless charging
资金
- National Research Foundation of Korea (NRF) - Korean Government (MSIT) [2018R1C1B6003854]
- National Research Foundation of Korea [2018R1C1B6003854] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study reviewed the impedance characteristics of the critically-coupled two-coil wireless power transfer system, highlighting the limitation of conventional three-coil systems to achieve the same impedance characteristics. By proposing a design method that changes the free resonant frequencies, a higher power transfer efficiency was successfully achieved in a three-coil wireless power transfer system compared to traditional two-coil and three-coil systems.
It is well known that the power transfer efficiency (PTE) of a two-coil wireless power transfer (WPT) system is maximized at critical coupling under fixed system parameters. However, the two-coil WPT system is critical-coupled with a relatively short distance between the coils. To overcome the problem, a multicoil WPT system has been studied. In this paper, we review the impedance characteristics of the critical-coupled two-coil WPT system and reveal that the conventional three-coil WPT system cannot have the same impedance characteristics as critical coupling. Based on the impedance matching conditions with critical coupling of the two-coil WPT system, we propose a design method of a three-coil WPT system in which the free resonant frequencies of all resonators are changed. The proposed design method is successfully implemented at the operating frequency of 6.78 MHz. The experimental results are in good agreement with the simulated PTEs and show that by changing the free resonant frequencies, a higher PTE can be effectively achieved in comparison to the conventional two-coil and thee-coil WPT systems.
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