Relay Effect of Wireless Power Transfer Using Strongly Coupled Magnetic Resonances

Zhang, Fei; Hackworth, Steven A.; Fu, Weinong; Li, Chengliu; Mao, Zhi-Hong; Sun, Mingui

doi:10.1109/tmag.2010.2087010

Cited by 186 publications

(107 citation statements)

References 11 publications

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“…Therefore, by placing a relay coil between Tx and Rx coils, longer distance for the power transmission process can be achieved [5], [6]. In [7], the relay effect in the magnetic resonance coupling has been reviewed.…”

Section: Introductionmentioning

confidence: 99%

A study on Relay Effect via Magnetic Resonant Coupling for Wireless Power Transfer

et al. 2016

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Abstract. Wireless power transfer (WPT) transmits electrical energy from a power source to an electrical load wirelessly or without any conductors. The capability of WPT to transmit the energy is limited. Therefore, a relay was introduced to increase the distance of the WPT capabilities. The effect of the relay has been investigated to extend the energy transfer distance. The effect of relay was demonstrated by placing a relay coil between transmitter and receiver, relay biased to transmitter and placing two relay coils in the designed system. Experimental results are provided to prove the concept of the relay effect. The power transmission efficiency can be achieved up to 75% at 1 meter distance.

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Section: Introductionmentioning

confidence: 99%

A study on Relay Effect via Magnetic Resonant Coupling for Wireless Power Transfer

et al. 2016

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“…The method has many advantages such as long distance transfer and user convenience. However, the system has not been commercialized because of electromagnetic interference (EMI), human activity, and some imposed regulations [1], [2]. Inductive coupling WPT follows the same principle of a transformer in the power converter.…”

Section: Introductionmentioning

confidence: 99%

6.78MHz Capacitive Coupling Wireless Power Transfer System

Yi¹

2015

Journal of Power Electronics

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Wireless power transfer technologies typically include inductive coupling, magnetic resonance, and capacitive coupling methods. Among these methods, capacitive coupling wireless power transfer (CCWPT) has been studied to overcome the drawbacks of other approaches. CCWPT has many advantages such as having a simple structure, low standing power loss, reduced electromagnetic interference (EMI) and the ability to transfer power through metal barriers. In this paper, the CCWPT system with 6.78MHz class D inverter is proposed and analyzed. The proposed system consists of a 6.78MHz class D inverter with a LC low pass filter, capacitor between a transmitter and a receiver, and impedance transformers. The system is verified with a prototype for charging mobile devices.

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“…And thus it has been widely applied in the field of consumer electronic products, electric vehicles and implantable medical devices for charging application [1,3,4,5] and etc. In recent years, some researchers have paid more attention to WPT applications with multi-repeater or multi-receiver, which ulteriorly leads to the concept wireless power transfer local area network (WPT-LAN) [6,7,8]. However, for WPT system, with the number of resonance coils greater than two, the cross coupling between non-adjacent coils, may seriously impact the transferred power and the transmission efficiency [9], and thus the cross coupling effect should be taken into account [10].…”

Section: Introductionmentioning

confidence: 99%

Reactance compensation method to eliminate cross coupling for two-receiver wireless power transfer system

Zhong

Luo

Feng

et al. 2015

IEICE Electron. Express

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For wireless power transferred (WPT) system with multi-receiver, the cross coupling effect between non-adjacent coils may seriously impact the performance of the system, decreasing the transferred power and the efficiency. In this paper, a theoretical analysis on the transferred power and the efficiency of two kinds of WPT system models with two-receiver is proposed via circuit theory. Furthermore, a reactance compensatory method is proposed to eliminate the adverse effect brought about by cross coupling, as well as a performance evaluated method introduced for comparing the transferred power and the efficiency before and after compensation. Numerical simulations and experimental results show the transferred power and the performance score are increased remarkably after compensationand it verifies the feasibility of this compensatory method.

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Relay Effect of Wireless Power Transfer Using Strongly Coupled Magnetic Resonances

Cited by 186 publications

References 11 publications

A study on Relay Effect via Magnetic Resonant Coupling for Wireless Power Transfer

A study on Relay Effect via Magnetic Resonant Coupling for Wireless Power Transfer

6.78MHz Capacitive Coupling Wireless Power Transfer System

Reactance compensation method to eliminate cross coupling for two-receiver wireless power transfer system

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