Optimizing Wireless Power Transfer From Multiple Transmit Coils

Arakawa, Tomohiro; Goguri, Sairam; Krogmeier, James V.; Kruger, Anton; Love, David J.; Mudumbai, Raghuraman; Swabey, Matthew

doi:10.1109/access.2018.2825290

Cited by 37 publications

(25 citation statements)

References 28 publications

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“…A comparative study of the proposed and previously presented solutions for drone imperfect landing (misalignment issues) is presented in this section. The system is compared with three solutions presented in Reference [37][38][39].…”

Section: Comparative Studymentioning

confidence: 99%

“…In Reference [38], the authors presented a target detection technique based on image processing. After landing, the center of the coil was aligned with the transmitting coil using some specific color detection and image-processing scheme.…”

Section: Comparative Studymentioning

confidence: 99%

“…The proposed wireless battery charging system consists of multiple transmitting coils which can be moved in four directions (positive X-direction, negative X-direction, positive Y-direction, and negative Y-direction). The use of multiple coils can potentially allow the system to efficiently adapt to magnetic field propagation conditions, similar to the way multiple antennas are used to adapt to channel conditions in wireless communication systems [38]. Also, multiple transmitting coils decrease the time for coil alignment, providing a chance for the design of big charging stations for large drones, where coil size and design are limited due to power transmission characteristics.…”

mentioning

confidence: 99%

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Development of Intelligent Drone Battery Charging System Based on Wireless Power Transmission Using Hill Climbing Algorithm

Rohan

Rabah

Talha

et al. 2018

ASI

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In this work, an advanced drone battery charging system is developed. The system is composed of a drone charging station with multiple power transmitters and a receiver to charge the battery of a drone. A resonance inductive coupling-based wireless power transmission technique is used. With limits of wireless power transmission in inductive coupling, it is necessary that the coupling between a transmitter and receiver be strong for efficient power transmission; however, for a drone, it is normally hard to land it properly on a charging station or a charging device to get maximum coupling for efficient wireless power transmission. Normally, some physical sensors such as ultrasonic sensors and infrared sensors are used to align the transmitter and receiver for proper coupling and wireless power transmission; however, in this system, a novel method based on the hill climbing algorithm is proposed to control the coupling between the transmitter and a receiver without using any physical sensor. The feasibility of the proposed algorithm was checked using MATLAB. A practical test bench was developed for the system and several experiments were conducted under different scenarios. The system is fully automatic and gives 98.8% accuracy (achieved under different test scenarios) for mitigating the poor landing effect. Also, the efficiency η of 85% is achieved for wireless power transmission. The test results show that the proposed drone battery charging system is efficient enough to mitigate the coupling effect caused by the poor landing of the drone, with the possibility to land freely on the charging station without the worry of power transmission loss.

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Section: Comparative Studymentioning

confidence: 99%

Section: Comparative Studymentioning

confidence: 99%

mentioning

confidence: 99%

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Development of Intelligent Drone Battery Charging System Based on Wireless Power Transmission Using Hill Climbing Algorithm

Rohan

Rabah

Talha

et al. 2018

ASI

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“…For an electrical engineer, the analysis method based on CT is simpler and more precise compared to that based on CMT, thus the CT method has been adopted extensively. With in-depth study of the MCR-WPT technology, many problems such as frequency splitting, impedance matching, enhance transfer efficiency and system stability have risen [12][13][14][15], especially with regard to transfer efficiency, which decreases sharply with the increases in transmission distance. This seriously hinders the development of WPT technology.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach to Reach Impedance Matching in Wireless Power Transfer Systems

Xiong

Chen

et al. 2019

Applied Sciences

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Wireless power transfer (WPT) using magnetic resonant coupling technology, came into focus promptly by virtue of its long transfer distance, and its non-radiative and high-efficiency power transfer. The impedance matching has been studied in the literature in recent years. However, there is no suitable way to reach the optimum load in reality. In this paper, a new method is proposed to maximize the power transfer ability of a given pair of coupled coils. An analytical calculation of the mutual inductance is presented accurately with respect to the angled concentric multiple-turn printed spiral coils (PSC). In addition, the experimental results were in good agreement with the circuit simulation. Finally, a WPT experiment setup working at 3MHz resonance was established. The experiment results verified that the maximum transfer efficiency at fixed distances can be easily achieved by adjusting the angle to reach impedance matching. Compared to prior to optimization, the maximum improved efficiency was improved by 11%.

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“…In [19], the transfer power of the system is optimized by adjusting the coupling coefficient of the coil through simulation. In addition to the multi-coil transfer topology with intermediate coils, there are also three topologies: multi transmitter to single receiver [20], single transmitter to multi receiver [21], and multi transmitter to multi receiver [22]. The authors in [23] propose a detailed analysis of the omnidirectional wireless power transfer systems, and an omnidirectional power transmission system is implemented.…”

mentioning

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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Optimizing Wireless Power Transfer From Multiple Transmit Coils

Cited by 37 publications

References 28 publications

Development of Intelligent Drone Battery Charging System Based on Wireless Power Transmission Using Hill Climbing Algorithm

Development of Intelligent Drone Battery Charging System Based on Wireless Power Transmission Using Hill Climbing Algorithm

A Novel Approach to Reach Impedance Matching in Wireless Power Transfer Systems

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

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