THE WIRELESS ELECTRIC POWER TRANSFER SYSTEM
Abstract
The equipment powered by built-in batteries has become widespread: unmanned aerial vehicles,
portable radios, tactical flashlights, electric vehicles, etc. Charging of batteries is often
carried out in a contact way – by connecting a power source by means of a detachable connection.
This requires the presence of technical personnel for maintenance and replacement of batteries;
requires the organization of protection of the battery connection from environmental influences
(moisture, dirt, etc.), as well as protection against electric shock to personnel. The purpose of the
research is to develop technical means of wireless transmission of electrical energy, which will
eliminate the use of detachable connections, improve electrical safety, and, most importantly, will
make it possible to make the charging process automatic. The results of the work are relevant for
the implementation of automatic cargo delivery systems using unmanned vehicles; for the implementation
of automatic charging systems for urban electric vehicles; for the implementation of automatic charging of unmanned land, floating (including underwater) and aircraft (reconnaissance,
patrol, etc.). The design of a wireless power transmission system with a power of up to
250 W, suitable for charging 6-cell lithium batteries, is described. The system works with coils
with a diameter of 200 mm, full operability is maintained for a distance between the coils centers
up to 100 mm. The efficiency in the entire range of operation modes is not lower than 74%, when
measured from the 220 V mains to the output to the battery. When designing, the goal was to minimize
the weight of the receiving part to facilitate its installation on the UAV and minimize the
impact on its thrust-to-weight ratio.
References
R. Electromagnetic Energy Harvesting and Wireless Power Transmission: A Unified Approach
// Proceedings of the IEEE. – Nov. 2014. – Vol. 102, No. 11. – P. 1692-1711.
2. Covic G.A. and Boys J.T. Inductive Power Transfer // Proceedings of the IEEE. – June 2013.
– Vol. 101, No. 6. – P. 1276-1289.
3. Bosshard R., Badstübner U., Kolar J.W., Stevanovic I. Comparative Evaluation of Control
Methods for Inductive Power Transfer // Proceedings of the International Conference on
Renewable Energy Research and Applications (ICRERA 2012), Nagasaki, Japan, November
11-14, 2012. – DOI: 10.1109/ICRERA.2012.6477400.
4. Garnica J., Chinga R.A. and Lin J. Wireless Power Transmission: From Far Field to Near
Field // Proceedings of the IEEE. – June 2013. – Vol. 101, No. 6. – P. 1321-1331.
5. Kurs A., Karalis A., Moffatt R., Joannopoulos J.D., Fisher P., and Soljacic M. Wireless Power
Transfer via Strongly Coupled Magnetic Resonances // Science. – June 2007. – Vol. 317,
No. 5834. – P. 83-86.
6. Wei X., Wang Z., and Dai H. A Critical Review of Wireless Power Transfer via Strongly
Coupled Magnetic Resonances // Energies. – July 2014. – Vol. 7, No. 7. – P. 4316-4341.
7. Nambiar S.C., Manteghi M. A simple wireless power transfer scheme for implanted devices //
Radio Science Meeting (USNC-URSI NRSM), United States National Committee of URSI
National, 2014.
8. Ho S.L., Wang J., Fu W.N., and Sun M. A Comparative Study Between Novel Witricity and
Traditional Inductive Magnetic Coupling in Wireless Charging // IEEE Transactions on
Magnetics. – May 2011. – Vol. 47, No. 5. – P. 1522-1525.
9. Burlaka V.V., Podnebennaya S.K., Gulakov S.V. Analysis of Approaches to the Efficiency
Improvement of Wireless Power Transmission Systems Using Low-Frequency Magnetic
Fields // In proceedings of 2018 IEEE 38th International Conference on Electronics And
Nanotechnology (ELNANO), Kyiv, 24-26 April, 2018. – Kyiv: Igor Sikorsky Kyiv
Polytechnic Institute, 2018. – P. 572-575. – DOI: 10.1109/ELNANO.2018.8477481.
10. QI Wireless Power Transfer System Description. Vol. I: Low Power Part 1: Interface
Definition. Version 1.0.1. – Wireless Power Consortium, October 2010.
11. Qi Wireless Charging. – Режим доступа: www.qiwireless.com.
12. Wireless Power Consortium. – Режим доступа: www.wirelesspowerconsortium.com.
13. Bosshard R., Kolar J.W. Inductive Power Transfer for Electric Vehicle Charging – Technical
Challenges and Tradeoffs // IEEE Power Electronics Magazine. – September 2016. – P. 22-30.
– DOI: 10.1109/MPEL.2016.2583839.
14. Qiu Chun, Chau K.T., Chunhua Liu, Chan C.C. Overview of Wireless Power Transfer for
Electric Vehicle Charging // Proceedings of EVS27 International Battery, Hybrid and Fuel
Cell Electric Vehicle Symposium (17-20 November 2013). – Barcelona, 2013. – P. 1-9.
15. Villa J.L., Sanz J., Sallan J. Inductive battery charging system for electric vehicles //
Proceedings of EVS27 International Battery, Hybrid and Fuel Cell Electric Vehicle
Symposium (17-20 November 2013). – Barcelona, 2013. – P. 1-4.
16. Bosshard R., Kolar J.W., Wunsch B. Control Method for Inductive Power Transfer with High
Partial-Load Efficiency and Resonance Tracking // Proceedings of the International Power
Electronics Conference – ECCE Asia (IPEC 2014), Hiroshima, Japan, May 18-21, 2014.
– DOI: 10.1109/IPEC.2014.6869889.
17. Pinuela M., Yates D.C., Lucyszyn S., Mitcheson P.D. Maximizing DC-to-Load Efficiency for
Inductive Power Transfer // IEEE Transactions on Power Electronics. – 2013. – Vol. 28.
– P. 2437-2447.
18. Wang C.S., Covic G.A., and Stielau O.H. Power Transfer Capability and Bifurcation
Phenomena of Loosely Coupled Inductive Power Transfer Systems // IEEE Trans. Ind.
Electron. – Feb. 2004. – Vol. 51, No. 1. – P. 148-157.
19. Pantic Z., and Lukic S.M. Framework and Topology for Active Tuning of Parallel
Compensated Receivers in Power Transfer Systems // IEEE Trans. Power Electron. – Nov.
2012. – Vol. 27, No. 11. – P. 4503-4513.
20. Бессонов Л.А. Теоретические основы электротехники. В 2 т. Т. 1. Электрические цепи:
учебник для ВУЗов. – 11-е изд., испр. и доп. – М.: Гардарики, 2007. – 701 c.
21. MicroID ® 125 kHz RFID System Design Guide. Document No. DS51115F. Microchip
Technology Inc. – 2004. – 210 p. – Режим доступа: ww1.microchip.com/downloads/
en/devicedoc/51115f.pdf.
