A Three-Resonator Wireless Power Transfer System With Constant-Output Feature Within a Misalignment Range

Yao, Yixiang; Ibrahim, Abubakar Uba; Zhong, Wenxing

doi:10.1109/tpel.2022.3193147

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…Research on omni-directional receivers was developed to reduce power transmission loss due to misalignment in wireless power transmission [2,3]. A study was undertaken to reduce the change in output due to the misalignment of electronic devices and electric vehicles using relay coils [4,5]. An analysis and design study strived to improve the Q-factor to increase the transmission distance in two-coil-type wireless power transmission [6].…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Relay Coil Inductance to Improve Transmission Efficiency of Four-Coil Magnetic Resonance Wireless Power Transmission Systems

Hwang,

Kwon,

2024

Electronics

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Magnetic resonance wireless power transmission consists of a source coil and relay coil (transmission coil (Tx-coil), receiving coil (Rx-coil)). The relay coil is designed with windings and a series capacitor, which are resonant with the input voltage frequency. Magnetic resonant wireless power transmission by a relay coil enables the transmission of power from a few centimeters to several meters. Recently, research has been conducted on the shape and material of each coil to increase the transmission distance. However, limitations remain with respect to increasing the transmission distance. Specifically, the optimization of the electrical characteristics of the relay coil is necessary to increase the transmission distance and improve efficiency. In this study, we configured the inductance of the relay coil to be approximately 95 μH, 270 μH, and 630 μH. Accordingly, we designed the series capacitors to have the same resonant frequency and analyzed the transmission characteristics of each relay coil. We confirmed that as the inductance increased, the transmission efficiency increased by up to 10%. The relay coil was designed to have an inductance of approximately three to six times that of the source coil (load coil). Thus, the optimal design of the relay coil is believed to be the most efficient and economical coil design.

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Section: Introductionmentioning

confidence: 99%

Optimal Design of Relay Coil Inductance to Improve Transmission Efficiency of Four-Coil Magnetic Resonance Wireless Power Transmission Systems

Hwang,

Kwon,

2024

Electronics

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“…Magnetic couplers can be specially designed to improve misalignment tolerance, such as multiple transmitting coils 10 or multiple receiving coils, 11 solenoidal coil, 12 antiparallel windings, and 13 additional windings. 14 Compensations are added in WPT systems to improve volt-ampere (VA) rating and efficiency. In the topologies with the primary-side series (S) compensation, such as S-S, series-parallel (S-P) and series-inductor-capacitor-capacitor (S-LCC), the output power increases with the decreasing coupling coefficient; however, in the topologies with the primary-side LCC compensation, such as LCC-S, LCC-P, and LCC-LCC, the output power decreases with the decreasing coupling coefficient.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Combination of three‐coil and LCC‐S structures for misalignment tolerance in wireless charging system with load‐independent output

Zhang,

Wu,

Liu

et al. 2023

Circuit Theory & Apps

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SummaryMisalignment tolerance is an important issue for the electric vehicle wireless charging system. This letter proposes a hybrid topology of the inductor–capacitor–capacitor‐series (LCC‐S) and three‐coil structures with load‐independent output to achieve misalignment tolerance, which is suitable for anti‐offset in the door‐to‐door direction of electric vehicles. The unipolar coil is divided into two windings to form the two coils in the three‐coil structure. The bipolar coil is employed as the transmitting coil of the LCC‐S topology, realizing decoupling from the two unipolar windings of three‐coil structure. The receiving coil only consists of a unipolar coil. From the central to the boundary positions, the output power of the three‐coil structure decreases while that of the LCC‐S topology increases. In this way, the output power can be stabilized against misalignment. Compared with existing hybrid topologies with two sets of coils, the receiver side adopts only one receiving coil and one compensation, which is compact, low‐profile, and cost effective. Besides, the output voltage is independent of the load, and the system can achieve constant voltage output characteristic. The experimental results validate the proposed system.

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Design and Efficiency Optimization of Asymmetric Magnetic Coupled Resonant Wireless Power Transfer System

Wan,

Zhou,

Yang

et al. 2024

Lecture Notes in Electrical Engineering

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A Three-Resonator Wireless Power Transfer System With Constant-Output Feature Within a Misalignment Range

Cited by 10 publications

References 37 publications

Optimal Design of Relay Coil Inductance to Improve Transmission Efficiency of Four-Coil Magnetic Resonance Wireless Power Transmission Systems

Optimal Design of Relay Coil Inductance to Improve Transmission Efficiency of Four-Coil Magnetic Resonance Wireless Power Transmission Systems

Combination of three‐coil and LCC‐S structures for misalignment tolerance in wireless charging system with load‐independent output

Design and Efficiency Optimization of Asymmetric Magnetic Coupled Resonant Wireless Power Transfer System

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