Transmission range extension strategy of parity–time‐symmetry‐based wireless power transfer system by a boost converter

Chen, Jintao; Xie, Fan; Zhang, Bo; Chen, Yanfeng; Xiao, Wenxun

doi:10.1002/cta.3434

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…In addition, a dc-dc converter can be added to the rectifier side to regulate the output, improving the system anti-offset ability. 18 Besides, using dual-side control, 19 dual frequency 20 and reconfigurable topology 21 can also improve the misalignment-tolerant performance of the system.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

“…In these scenarios, two sets of couplers are utilized, which increases the volume and cost, especially on the EV side. In addition, a dc‐dc converter can be added to the rectifier side to regulate the output, improving the system anti‐offset ability 18 …”

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

View full text Add to dashboard Cite

show abstract

“…In Ref. [13], a DC-DC link was added to the secondary side of the system, reducing the critical coupling coefficient of the system by changing the equivalent AC resistance of the system and, thus, its necessary coupling coefficient. However, additional components increase the size of the receiving end.…”

Section: Introductionmentioning

confidence: 99%

A Three-Coil Constant Output Wireless Power Transfer System Based on Parity–Time Symmetry Theory

Yue,

Yang,

2023

Applied Sciences

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In a three-coil wireless power transfer system with relay coils, the transmission efficiency and output power of the system decreases with changes in the adjacent coupling coefficients. Controlling the power of three-coil wireless power transfer systems is also a significant challenge. To solve these issues, a three-coil wireless power transfer system based on parity–time symmetry is proposed in this paper. First, a three-coil parity–time wireless power transfer system was modeled based on a circuit model. Then, the transmission and gain characteristics of the three-coil parity–time wireless power transfer system were analyzed. It was found that when the system is in a parity–time-exact region, it can maintain a constant transmission efficiency and output power, and its output power is independent of the coupling coefficient. In addition, based on the output characteristics of the three-coil parity–time wireless power transfer system, a power control method and a working range detection method were proposed to attain a constant power output. Finally, a three-coil parity–time wireless power transfer system was experimentally tested.

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A robust parity‐time‐symmetric hybrid wireless power transfer system with extended coupling range

Qiu,

Chen,

et al. 2024

Circuit Theory & Apps

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SummaryInductive power transmission (IPT) and capacitive power transmission (CPT) are currently the two main wireless power transfer technologies. Hybrid power transmission (HPT) systems that combine IPT and CPT can improve transmission performance and are more attractive for some charging applications such as electric bicycles (e‐bikes). However, HPT systems are more sensitive to parameter variations, and the coupling mechanism is prone to misalignment during wireless charging. Therefore, achieving stable output power and constant transfer efficiency over a wide range of coupling coefficient variations is still a major challenge for HPT systems. In this work, the parity–time (PT) symmetry theory is applied to an SS‐type HPT system, and a circuit model of the PT‐based HPT system is developed by using coupling capacitance and coupling inductance. The effect of connecting the plates to the homonymous end or heteronymous end of the coupling coils on the PT symmetry range of the HPT system is discussed. It is found that the heteronymous end connection of the coils can effectively increase the range of constant output power and stable transfer efficiency. Finally, a prototype is built to verify the feasibility and effectiveness of the proposed PT‐based HPT system. The transfer power and efficiency remain constant in the PT‐symmetric range, and the inductive and capacitive coupling coefficients are smaller compared to IPT and CPT systems with the same parameters.

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Transmission range extension strategy of parity–time‐symmetry‐based wireless power transfer system by a boost converter

Cited by 3 publications

References 20 publications

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

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

A Three-Coil Constant Output Wireless Power Transfer System Based on Parity–Time Symmetry Theory

A robust parity‐time‐symmetric hybrid wireless power transfer system with extended coupling range

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