Distance-Insensitive Wireless Power Transfer Using Mixed Electric and Magnetic Coupling for Frequency Splitting Suppression

Zhang, Xiu Yin; Xue, Cheng-Dai; Lin, Jie-Kai

doi:10.1109/tmtt.2017.2686858

Cited by 38 publications

(18 citation statements)

References 34 publications

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“…In the output side, frequency splitting phenomenon occurs, where the load power-frequency curve changes from a single-peak curve to a double-peak curve, and meanwhile the output power of the energy transfer system cannot reach the maximum [8]. Numerous literatures focus on the causes of frequency splitting [9], the derivation of frequency splitting equations [10], the system structure optimization [11][12][13], frequency tracking [14], etc., and devote to eliminating frequency splitting or achieving optimal energy transfer in the case of frequency splitting. From the perspective of input characteristic, the compensation capacitors cause the high-order mathematical model of the system to have multiple real roots when the coupling coefficient is greater than a certain value, which is similar to the fold bifurcation of the fast subsystem in some nonlinear systems [15,16].…”

Section: Introductionmentioning

confidence: 99%

Interference Analysis of Metal Conductors for Target-Resonance-Based Detection Method

Chen¹,

Zhang²,

Yinchun³

et al. 2020

Complexity

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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.

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Section: Introductionmentioning

confidence: 99%

Interference Analysis of Metal Conductors for Target-Resonance-Based Detection Method

Chen¹,

Zhang²,

Yinchun³

et al. 2020

Complexity

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“…However, with the increasing of the transfer distance, the transfer performance of the traditional two coil structure drastically decreases [6], which often brings difficulties in practical applications. Moreover, the frequency splitting phenomena seriously affect the transfer performance of WPT(Wireless Power Transfer) systems [7]. Figure 1 shows an MCR-WPT system with an intermediate coil, which is the coaxial circular coil.…”

Section: Introductionmentioning

confidence: 99%

Optimal Position of the Intermediate Coils in a Magnetic Coupled Resonant Wireless Power Transfer System

et al. 2019

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Coaxial coil topology is used as the transfer medium in traditional MCR-WPT (Magnetic Coupled Resonant Wireless Power Transfer) systems to improve the transfer characteristics. The intermediate coils are added to extend the transmission distance, whose positions are critical. This paper focuses on the optimal intermediate coil positions for an MCR-WPT system with four coaxial planar circular spiral coils. By modeling the MCR-WPT system, the mathematical expression of the self-inductance and the mutual inductance are used to calculate the load power of the MCR-WPT system, which is composed of four planar circular spiral coaxial coils, and using MATLAB. The optimal distance ratio between the adjacent coils for maximizing the power of load is proposed. Furthermore, the experiments are implemented from the network analyzer and the experimental platform. In the platform, the load power is measured at the different intermediate coil positions, and the optimal position at which the load power is maximized is found. Both experimental results obtained by the network analyzer and the experimental platform have validated the theoretical and simulation results and provided the correctness of the suggested ratios.

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“…Electromagnetic coupling WPT systems can be designed based on magnetic resonance coupling, electric resonance coupling or mixed magnetic and electric resonance coupling. Magnetic coupling is currently more popular than electric coupling in the field of wireless power transfer, especially in the mid-range WPT applications [4,[8][9][10]. No matter which coupling is utilized, it is necessary to maintain the strength of coupling between the transmitting and receiving elements at a certain level.…”

Section: Introductionmentioning

confidence: 99%

“…Such data will greatly help engineers to design a good WPT system. An example based on magnetic and electrical components is the WPT system reported in [10], where a distance-insensitive WPT system is proposed by making use of the out-of-phase characteristic of the electric and magnetic coupling coefficients. Our previous studies also presented some results on the electromagnetic coupling [16,17].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Electric Coupling Analysis for Angular Misalignment of Spiral Resonators in WPT Systems

Zhang¹,

Yoshikawa²

2018

PIER M

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Angular misalignment is an issue for many potential applications of wireless power transfer (WPT). It is necessary to keep coupling coefficient, especially the magnetic coupling to be insensitive to angular misalignment. This paper analyzes the coupling between the spiral resonators when one resonator rotates with respect to the other. The quantitative data of magnetic and electric coupling components as well as the total coupling coefficient in angular misalignments are presented. Furthermore, a 3D spiral resonator which is less sensitive to angular misalignment is proposed. The coupling when the 3D spiral rotates is studied and the results of analysis and experiment both show that the proposed 3D spiral resonator can keep coupling coefficient at a certain level under angular misalignment.

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Distance-Insensitive Wireless Power Transfer Using Mixed Electric and Magnetic Coupling for Frequency Splitting Suppression

Cited by 38 publications

References 34 publications

Interference Analysis of Metal Conductors for Target-Resonance-Based Detection Method

Interference Analysis of Metal Conductors for Target-Resonance-Based Detection Method

Optimal Position of the Intermediate Coils in a Magnetic Coupled Resonant Wireless Power Transfer System

Magnetic and Electric Coupling Analysis for Angular Misalignment of Spiral Resonators in WPT Systems

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