Optimization Design of Resonance Coils With High Misalignment Tolerance for Drone Wireless Charging Based on Genetic Algorithm

Chen, Rong; He, Xiangrui; Wu, Yitong; Qi, Yongtao; Wang, Ruohan; Sun, Yunong; Liu, Minghai

doi:10.1109/tia.2021.3057574

Cited by 56 publications

(15 citation statements)

References 37 publications

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“…However, in the case studies, an approximately 13% coupling coefficient reduction can be observed when the displacement is 50% in size ratio. The same conclusion can be obtained in [21,22], even though the new structures and optimization methods are proposed. Hence, the DC-DC converter on the receiving side is an urgent demand in the load side system for output energy regulation.…”

Section: Introductionsupporting

confidence: 68%

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Stability Improvement of Dynamic EV Wireless Charging System with Receiver-Side Control Considering Coupling Disturbance

et al. 2021

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Receiver-side control has been a reliable practice for regulating the transferred energy to the batteries in the electric vehicle (EV) wireless power transfer (WPT) systems. Nonetheless, the unpredictable fluctuation of the mutual inductance in dynamic wireless charging brings extreme instability to the charging process. This overshoot that appears in instant vibrations may largely increase the voltage/current stress of the system, and even cause catastrophic failure in the battery load. In addition, the speed of the vehicles may lead to untraceable steady-state operation. However, existing solutions to the above two issues suffer from either long communication time delay or significantly compromised output regulation. In this paper, the slow dynamics and the overshoot issues of the WPT system are elaborated in theory, and the small-signal model mainly considering mutual inductance disturbance is established. A simple feedforward control is proposed for overshoot damping and fast system dynamics. Experimental results validate that the overshoot can be reduced by 13% and the settling time is improved by 50% in vehicle braking or acceleration. In constant speed driving, the battery charging ripple is decreased by 12% and ensures better system stability.

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Section: Introductionsupporting

confidence: 68%

“…Some studies have discussed that the optimized shape of the coupler can improve the tolerance of misalignment during the movement of the secondary side [20][21][22]. The article [19] proposes a split flat solenoid coupler to improve the robustness of mutual inductance under misalignment.…”

Section: Introductionmentioning

confidence: 99%

Stability Improvement of Dynamic EV Wireless Charging System with Receiver-Side Control Considering Coupling Disturbance

et al. 2021

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“…It is noted that observed from Figure Rong et al [51] have investigated the optimization design of resonance coils for drone wireless charging system, where the horizontal misalignment between the Tx and Rx coils may happen. For the first time, the authors proposed an unequally spaced Tx coil and a varying radius size per turn Rx coil to well address the misalignment problem.…”

Section: Optimizations Of Tx and Rx Coils For The Misalignment Scenariosmentioning

confidence: 99%

Optimization of the Coupling Coefficient of the Inductive Link for Wireless Power Transfer to Biomedical Implants

Bao

Xie

et al. 2022

International Journal of Antennas and Propagation

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This work focuses on the optimization of coupling coefficient (k) of the inductive link for the wireless power transfer (WPT) system to be used in implantable medical devices (IMDs) of centimeter size. The analytic expression of k is presented. Simulations are conducted by using the high-frequency structure simulator (HFSS). Analytic results are verified with simulations. The receiving (Rx) coil is implanted in the body and set as a circular coil with a radius of 5 millimeters for reducing the risk of tissue inflammation. The inductive link under misalignment scenarios is optimized to improve k. When the distance between the transmitting (Tx) and Rx coils is fixed at 20 mm, it is found that, to maximize k, the Tx coil in a planar spiral configuration with an average radius of 20 mm is preferred, and the Rx coil in a solenoid configuration with a wire pitch of 0.7 mm is recommended. Based on these optimization results, an inductive link WPT system is proposed; the coupling coefficient k, the power transfer efficiency (PTE), and the maximum power delivered to the load (MPDL) of the system are obtained with both simulation and experiment. Different media of air, muscle, and bone separating the Tx and Rx coils are tested. For the muscle (bone) medium, PTE is 44.14% (43.07%) and MPDL is 145.38 mW (128.13 mW), respectively.

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“…The more coil turn and the larger coil pitch, the stronger the magnetic field. However, by increasing the number of coil turn and coil pitch, the Tx coil can add extra volume [30]. Therefore, in this study, the coil turn number of each loop and the coil pitch are set to five turns and 5mm, respectively.…”

Section: A Free-positioning Transmitting Coil Using Double Reversed Coil Loopmentioning

confidence: 99%

“…where P T E ll and P T E lh are the individual PTE of multiple-receiver system when the system is on single and dual operating band, respectively. From ( 29) and (30), it is obvious that the output voltage is proportional to the frequency ratio. Therefore, in a multiple-receiver WPT system, the output voltage of one receiver can be enhanced by adjusting the operating frequency.…”

Section: Multiple-receiver Wpt Systemmentioning

confidence: 99%

Dual-Band Free-Positioning Transmitting Coil for Multiple-Receiver Wireless Power Transfer

Le-Huu

Seo

2021

IEEE Access

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In recent years, the requirement for a compact wireless power transfer (WPT) system that can supply power to multiple devices in various practical usage scenarios has been attracted many researchers. The receiver (Rx) misalignment problem is contributory to the power transfer efficiency (PTE) degradation. Moreover, in a multiple-output WPT system, the overall system efficiency is also affected by cross-coupling between receivers. This paper proposes a dual-band free-positioning transmitting coil (FPDB-Tx) for multiple-receiver WPT. A three-dimensional Tx structure is modeled by investigating the current direction on each coil loop to adapt the Rx angular and axial misalignment. The Tx configuration is designed following a wireless charging box concept, where multiple Rx devices can receive energy freely without a null efficiency point. The mutual inductance is examined by a mathematical method in various Rx orientations to verify the free-positioning characteristic. Furthermore, an equivalent circuit model of the WPT system is theoretically analyzed to obtain dual operating frequency bands and then maximized the PTE. The experimental results show that the proposed WPT system achieves a stable PTE in various Rx positions. Especially, the WPT system has a maximum PTE of 97.27% and 91% at 6.78 MHz and 13.56MHz, respectively.INDEX TERMS wireless power transfer, free-positioning WPT, multiple-receiver WPT, dual-band WPT, mutual coupling, impedance matching network.

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Optimization Design of Resonance Coils With High Misalignment Tolerance for Drone Wireless Charging Based on Genetic Algorithm

Cited by 56 publications

References 37 publications

Stability Improvement of Dynamic EV Wireless Charging System with Receiver-Side Control Considering Coupling Disturbance

Stability Improvement of Dynamic EV Wireless Charging System with Receiver-Side Control Considering Coupling Disturbance

Optimization of the Coupling Coefficient of the Inductive Link for Wireless Power Transfer to Biomedical Implants

Dual-Band Free-Positioning Transmitting Coil for Multiple-Receiver Wireless Power Transfer

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