Nonlinear Parity-Time-Symmetric Model for Constant Efficiency Wireless Power Transfer: Application to a Drone-in-Flight Wireless Charging Platform

Zhou, Jiali; Zhang, Bo; Xiao, Wenxun; Qiu, Dongyuan; Chen, Yanfeng

doi:10.1109/tie.2018.2864515

Cited by 237 publications

(139 citation statements)

References 28 publications

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“…Another critical aspect is the misalignment of the WPT coils due to an imprecise landing of the drone that can lead to a reduction of the coupling factor between coils, and therefore of the electrical performance. These two aspects have been investigated in the recent past, and several solutions have been presented [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. All the proposed solutions were mainly derived by previous WPT applications in other fields such as automotive or consumer electronics, and the main focus was on adapting these techniques to drones.…”

Section: Introductionmentioning

confidence: 99%

Innovative Design of Drone Landing Gear Used as a Receiving Coil in Wireless Charging Application

et al. 2019

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A near-field wireless power transfer (WPT) technology is applied to recharge the battery of a small size drone. The WPT technology is an extremely attractive solution to build an autonomous base station where the drone can land to wirelessly charge the battery without any human intervention. The innovative WPT design is based on the use of a mechanical part of the drone, i.e., landing gear, as a portion of the electrical circuit, i.e., onboard secondary coil. To this aim, the landing gear is made with an adequately shaped aluminum pipe that, after suitable modifications, performs both structural and electrical functions. The proposed innovative solution has a very small impact on the drone aerodynamics and the additional weight onboard the drone is very limited. Once the design of the secondary coil has been defined, the configuration of the WPT primary coil mounted in a ground base station is optimized to get a good electrical performance, i.e., high values of transferred power and efficiency. The WPT design guidelines of primary and secondary coils are given. Finally, a demonstrator of the WPT system for a lightweight drone is designed, built, and tested.

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Section: Introductionmentioning

confidence: 99%

Innovative Design of Drone Landing Gear Used as a Receiving Coil in Wireless Charging Application

et al. 2019

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“…When Q = 0.707, ks arrives at its peak of 1. According to (9) and (10) the splitting frequencies over certain range of k and RE can be plotted as Figure 5. The splitting frequencies is exactly the values where the output power reaches its peaks in Figure 3; when k is smaller than ks the frequency corresponding to the maximum output power is close to the resonant frequency f0.…”

Section: Output Power For Symmetric Casesmentioning

confidence: 99%

“…A hefty number of related studies have appeared [1,2], making WPT technology more and more feasible. Now wireless charging is adopted for electric vehicle charging [3][4][5], power supplies for medical implanting devices [6,7], underwater devices [8], industrial drone charging [9,10], power supplies for consumer electronics [11,12], etc. All these products and services use WPT technology to improve and advance the experience feeling, making WPT applications increasingly diverse.…”

Section: Introductionmentioning

confidence: 99%

Influence of Asymmetric Coil Parameters on the Output Power Characteristics of Wireless Power Transfer Systems and Their Applications

2019

Self Cite

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Nowadays, it is a trend to update electronic products by replacing the traditional wire charging with emerging wireless charging. However, other features of the products must generally be left unchanged, which limits the options in receiving coil design. As a result, asymmetric coil designs should be adopted in wireless charging systems. In this paper, a wireless power transfer system with asymmetric transmitting and receiving coils is modelled using circuit theory. The output power of the asymmetric system is analyzed, and the conditions of the maximum power splitting phenomenon are addressed in detail. Cases for different resonant frequency conditions are elaborated. The splitting frequencies and critical coupling coefficient are obtained, which are different and more complicated compared with the symmetric counterparts. Asymmetric coil designs can be adopted based on the proposed method, so that adequate and efficient output power transfer can be realized. Finally, the asymmetric coils design is utilized in an experimental prototype in order to contactlessly charge a portable power tool lithium-ion battery pack with 18 V DC and 56 W output through 220 V AC input, without altering its original configuration, and the correctness of proposed analysis can thus be verified.

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“…In the literature [12], Jiang et al proposed a control strategy with a zero voltage switching angle (ZVSA) loop to realize the constant current (CC) charging for the battery, and to achieve the zero voltage switching (ZVS) operation of the primary inverter. In the literature [13], a highly efficient nonlinear parity-time (PT)-symmetric model for wireless power transfer (WPT) was proposed. The theoretical analysis shows that the proposed system automatically achieves a constant output power with a constant transfer efficiency against the variation of the coupling coefficient.…”

Section: Introductionmentioning

confidence: 99%

Research on an EV Dynamic Wireless Charging Control Method Adapting to Speed Change

Tan

Zhao

Ju³

et al. 2019

Energies

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In order to solve the problem of the electric vehicle (EV) charging amount fluctuation caused by the variation of driving speed during dynamic wireless charging, this paper proposes an EV dynamic wireless charging control method adapting to speed change. Firstly, a dynamic wireless charging model based on a long-track transmitting coil is established, and the expression of the charging power of each load under multi-load situation is obtained. Secondly, the influence of the EV charging number and maximum driving speed on the range of system parameters is studied. Subsequently, the method for determining the load resistance value according to the driving speed under a multi-EV charging condition is further discussed. Afterwards, a charging power control method adapting to the speed variation by load adjustment is proposed. By adjusting the equivalent load of the variable-speed charging EV, its speed variation range can reach 20~60 km/h, while the remaining EVs’ charging power fluctuation range can be kept within 10%~15%. Finally, the experimental prototype is built to verify the above-mentioned control method.

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Nonlinear Parity-Time-Symmetric Model for Constant Efficiency Wireless Power Transfer: Application to a Drone-in-Flight Wireless Charging Platform

Cited by 237 publications

References 28 publications

Innovative Design of Drone Landing Gear Used as a Receiving Coil in Wireless Charging Application

Innovative Design of Drone Landing Gear Used as a Receiving Coil in Wireless Charging Application

Influence of Asymmetric Coil Parameters on the Output Power Characteristics of Wireless Power Transfer Systems and Their Applications

Research on an EV Dynamic Wireless Charging Control Method Adapting to Speed Change

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