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Influence of Asymmetric Coil Parameters on the Output Power Characteristics of Wireless Power Transfer Systems and Their Applications
- Source :
- Energies, Volume 12, Issue 7, Energies, Vol 12, Iss 7, p 1212 (2019)
- Publication Year :
- 2019
- Publisher :
- MDPI AG, 2019.
-
Abstract
- Nowadays, it is a trend to update electronic products by replacing the traditional wire charging with emerging wireless charging. However, other features of the products must generally be left unchanged, which limits the options in receiving coil design. As a result, asymmetric coil designs should be adopted in wireless charging systems. In this paper, a wireless power transfer system with asymmetric transmitting and receiving coils is modelled using circuit theory. The output power of the asymmetric system is analyzed, and the conditions of the maximum power splitting phenomenon are addressed in detail. Cases for different resonant frequency conditions are elaborated. The splitting frequencies and critical coupling coefficient are obtained, which are different and more complicated compared with the symmetric counterparts. Asymmetric coil designs can be adopted based on the proposed method, so that adequate and efficient output power transfer can be realized. Finally, the asymmetric coils design is utilized in an experimental prototype in order to contactlessly charge a portable power tool lithium-ion battery pack with 18 V DC and 56 W output through 220 V AC input, without altering its original configuration, and the correctness of proposed analysis can thus be verified.
- Subjects :
- Control and Optimization
Maximum power principle
Computer science
Energy Engineering and Power Technology
lithium-ion battery
02 engineering and technology
lcsh:Technology
Lithium-ion battery
wireless power transfer (WPT)
0202 electrical engineering, electronic engineering, information engineering
Wireless
Maximum power transfer theorem
Wireless power transfer
Electrical and Electronic Engineering
Engineering (miscellaneous)
lcsh:T
Renewable Energy, Sustainability and the Environment
business.industry
020208 electrical & electronic engineering
transmitting and receiving coils
Electrical engineering
020206 networking & telecommunications
power tools
Battery pack
Power (physics)
Electromagnetic coil
asymmetric design
business
Coupling coefficient of resonators
Energy (miscellaneous)
Subjects
Details
- ISSN :
- 19961073
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- Energies
- Accession number :
- edsair.doi.dedup.....40c46d6978839027cb877227f276cd76