Study on Arrangement of Self-Resonant Coils in Wireless Power Transfer System Based on Magnetic Resonance

김진욱,; 지현호,; 최연규,; 윤영현,; 김관호,; 박영진,

doi:10.5515/kjkiees.2010.21.6.564

Cited by 11 publications

(3 citation statements)

References 5 publications

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“…Then the transmitter coil transmits power via evanescent wave coupling with the receiver coil. At that time, the following equation was obtained using the coupled mode theory between the transmitter and the receiver [9].…”

Section: Wpt Diagrammentioning

confidence: 99%

Characteristic of wireless power transmission S-Parameter for a superconductor coil

Jeong¹,

Jung²,

Choi³

2015

Progress in Superconductivity and Cryogenics

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Many studies are being conducted to implement wireless charging, for example, for cellular phones or electronic tooth brushes, via wireless power transmission technique. However, the magnetic induction method had a very short transmission distance. To solve this problem, the team of Professor Marin Soljacic proposed a magnetic resonance system that used two resonance coils with the same resonance frequency. It had an approximately 40% efficiency at a 2m distance. The system improved the low efficiency and short distance problems of the existing systems. So it could also widen the application range of wireless power transmission. Many studies on the subject are underway. In this paper, the superconductor coil was used to improve the efficiency of magnetic resonance wireless power transmission. The resonance wireless power transmission system had a source coil, a load coil, and resonance coils (a transmitter and a receiver). The efficiency and distance depended on the characteristics of the transmitter and receiver coils that had the same resonance frequency. Therefore, two resonance coils were fabricated by superconductors. The current density of the superconductor was higher than that of the normal conductor coil. Accordingly, it had a high quality-factor and improved efficiency

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Section: Wpt Diagrammentioning

confidence: 99%

Characteristic of wireless power transmission S-Parameter for a superconductor coil

Jeong¹,

Jung²,

Choi³

2015

Progress in Superconductivity and Cryogenics

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Section: ⅰ Introductionmentioning

confidence: 99%

“…RFID (Radio Frequency Identification) is one of example operating in near field zone with the principle of magnetic induction [2]. Many papers are published about these topics [3], [4], including some domestic papers about wireless power transmissions [5], [6].The main concern of this paper is to show parameters simple and accurate enough to determine the amount of received power from the sender under the near field circumstances. This task is accomplished by introducing the mutual impedance and the transducer power gain.…”

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confidence: 99%

Power Transmission Determined by the Mutual Impedance and the Transducer Power Gain in the Near Field Region

Kim¹

2011

Journal of electromagnetic engineering and science

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This paper describes the role of mutual impedance and the transducer power gain which comes from key parameters to determine the amount of wireless power especially in a near-field environment. These two key parameters are applied to the two configurations; one is a dipole-dipole, and the other is a dipole-metal plate-loop configuration. Discussions are given on the achievable maximum power transfer between the sender and the receiver affected by the matching and the pass blockage. Ⅰ. IntroductionDepending on the relative wavelength distance between a sender and a receiver, wave regions are classified as near field and far field regions [1]. When a pair of antenna operates in the far field region, mutual impedance becomes so negligible that each transmitting and receiving antenna could be treated independently and so little attention might be paid on their mutual impedance. However, for antennas operated in the near field, mutual impedance could no longer be ignored since the antenna pair becomes very dependent on each other. This fact is equally applied to recent wireless power transmissions since most of this system operates in a near field region. RFID (Radio Frequency Identification) is one of example operating in near field zone with the principle of magnetic induction [2]. Many papers are published about these topics [3], [4], including some domestic papers about wireless power transmissions [5], [6].The main concern of this paper is to show parameters simple and accurate enough to determine the amount of received power from the sender under the near field circumstances. This task is accomplished by introducing the mutual impedance and the transducer power gain. Once the mutual impedance is known either by analytical formula or by simulated value, the transducer power gain can be determined based on the "black box" approach. The resulting transducer gain enables us to calculate the power arrived at the receiving antenna, a key quantity in wireless power transmission.As an illustration, configurations of {dipole-dipole} and {dipole-metal plate-loop} are considered. The configuration of {dipole-dipole} is included here because its formula of mutual impedance is already known. Therefore one can estimate the errors involved in numerical calculation. A second configuration having no analytic solution is also studied because we can still calculate the receiving power using the transducer power gain formula even in this situation. In addition, the achievable power transfer is discussed with respect to 50 ohm reference resistance and the conjugate matched load. We focus on the moderate level of analytic approach not on the elaborate experimental study to provide the stepping stones between academic interest and industrial practice. Ⅱ. Formulation of the Problem 2-1 Mutual Impedance of Dipole-Dipole StructureMutual impedance dictates the determination of wireless power, particularly, on systems operating in a near field region. Fig. 1 shows a pair of half wavelength dipoles of radius a, length l and distan...

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Performance Measurement of the Wireless Charging Devices Using Eletromagnetic Induction Techniques

Ryu

Kim²,

Koo

2015

The Journal of Korea Navigation Institute

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[Abstract]This paper presented the design of wireless power transfer (WPT) system using electromagnetic induction techniques and analysed WPT efficiency. Also, we presented the optimum coil condition by measuring the efficiency variation according to some receiving coil parameter changes. Voltage change is measured by receiving coil position for the designed transmitting and receiving circuit. Voltage change according to inductance variation at the same position and charging time are compared at the same environment by using a developed application program to realize an optimum WPT system. Developed wireless power transfer system using electromagnetic induction techniques uses 125 kHz. It takes 16 minutes by using wired charger, and 23 minutes by using wireless charger for charging from 50% to 60% charging status.

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Study on Arrangement of Self-Resonant Coils in Wireless Power Transfer System Based on Magnetic Resonance

Cited by 11 publications

References 5 publications

Characteristic of wireless power transmission S-Parameter for a superconductor coil

Characteristic of wireless power transmission S-Parameter for a superconductor coil

Power Transmission Determined by the Mutual Impedance and the Transducer Power Gain in the Near Field Region

Performance Measurement of the Wireless Charging Devices Using Eletromagnetic Induction Techniques

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