Abstract
Frequency bifurcation phenomenon is an important input characteristic of the magnetically coupled resonant wireless power transfer (MCR-WPT) system in overcoupling situation. In this paper, frequency bifurcation phenomenon in MCR is extended to the general transmitter-receiver coupling system, and the two main factors affecting the phenomenon are analyzed. Finally, the phenomenon is introduced into the field of signal detection, and a noncontact detection method based on target coil resonance is proposed in this paper. Since the proposed method is a kind of electromagnetic method, the detection system is highly susceptible to the surrounding metal conductors. Therefore, the detection performance of this method under three metal-environment conditions is analyzed, respectively. Simulations and experiments show that the metal barrier can weaken the detection because of the eddy current effect, but as long as the barrier does not completely isolate the two coils, the method still has strong penetrability. Besides, the metal plate placed parallel outside the transmitter has less influence on the detection when compared with the metal barrier, and the metal plate by the side of the transmitter can even enhance the detection effect. As a consequence, this method has strong stability in metal environment.
Highlights
Coupled resonant (MCR) technology was firstly proposed in 2007 [1], which is a nonradiative, high-efficiency, and medium-distance wireless power transfer (WPT) technology based on magnetic resonance coupling [1, 2]
The research of Magnetically coupled resonant (MCR) technology mainly aims at improving the energy transmission characteristics of the system, including coil and transmission structure optimization design [3,4,5] and system control [6]
When the coupling coefficient between the transmitting coil and the receiving coil is too large in the magnetically coupled resonant wireless power transfer (MCR-WPT) system, the power transfer will be influenced significantly [7]
Summary
Coupled resonant (MCR) technology was firstly proposed in 2007 [1], which is a nonradiative, high-efficiency, and medium-distance wireless power transfer (WPT) technology based on magnetic resonance coupling [1, 2]. It is a great revolution in the field of energy transmission and has been a research hotspot until now. Erefore, frequency splitting phenomenon is a description of output characteristics of the system, while the frequency bifurcation phenomenon reflects input characteristics of the system [17] Both the two phenomena occur in an overcoupling condition, but they are different because the critical coupling coefficients of these two phenomena are not equal. The causes of these simulations and experimental phenomena as well as the potential application of the method are discussed
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