Optimization on Three-Coil Long-Range and Dimension-Asymmetric Wireless Power Transfer System

Wu, Feng; Chu, Xiaohu; Li, Qiang; Li, Rui; Liu, Li; Jing, Fansheng

doi:10.1109/temc.2020.2976652

Cited by 21 publications

(7 citation statements)

References 22 publications

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“…As possible losses due to reactive effects should be reduced, it is usual to consider all circuits tuned at the same angular frequency (

ω^{- 1} = \sqrt{L_{1} C_{1}} = \sqrt{L_{2} C_{2}} = \sqrt{L_{3} C_{3}}

) and to neglect the influence of non‐adjacent mutual inductances (

M_{13} = 0

), because under these conditions, the voltages and currents in each circuit are in phase. Note that these same conditions are indistinctly applied in different works for three‐ and four‐coil WPT systems 4,9,25–27 and that in practical terms,

M_{13}

can be minimized increasing the operating distance between coils and/or coil size/arrangement reducing the coupling between

L_{1}

and

L_{3}

.…”

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5] Starting with the pioneer work of Tesla 6 using WPT systems with only two coils, several other arrangements using three or more coils have been recently researched. [3][4][5][7][8][9][10][11] For instance, typical three-coil WPT systems are composed of three circuits (usually tuned at the same resonance frequency to reduce the losses due to reactive effects), one containing the source, the other containing the load, and one intermediary (relay circuit), where all are coupled to the adjacent ones by their respective mutual inductances.Independently of the number of coils used, a typical WPT system is usually designed aiming optimal efficiency (η), which can be defined as the power delivered to the load circuit divided by the total power supplied by the source. Alternatively, the WPT systems can be designed optimizing their power transfer capability (P Ã ), which can be defined as the power delivered to the load circuit divided by the maximum ideal amount of power which can be delivered to the same load circuit.However, in some applications, the mutual inductance between the coils may vary because the relative position of the coils is not fixed.…”

mentioning

confidence: 99%

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A simple method to control automatically the performance of three‐coil wireless power transfer systems without direct output measurement

Garcia

Abatti

2022

Circuit Theory & Apps

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The control and optimization of wireless power transfer (WPT) systems require the continuous monitoring of their performance or, similarly, some output parameters. The solution presented in this manuscript is based on the relationship between some figures of merit representative of the WPT systems and allows to control automatically (in a simple way, without any direct measurement at the load circuit) the performance of a three-coil WPT system under variations on the load and/or mutual inductance between the intermediate and load coils. The qualities and limitations of the proposed method are discussed in detail. Conventional circuit analysis and practical results are included to validate the presented theory and its applicability in an automatic control scheme.efficiency, figures of merit, inductive power transfer, power transfer capability, wireless power transfer | INTRODUCTIONWireless power transfer (WPT) systems via inductive coupling have become a key technology in several fields, for example, electric vehicles' battery recharging systems and implantable medical devices, due to their intrinsic characteristics, such as flexibility, safety, reliability, and convenience. [1][2][3][4][5] Starting with the pioneer work of Tesla 6 using WPT systems with only two coils, several other arrangements using three or more coils have been recently researched. [3][4][5][7][8][9][10][11] For instance, typical three-coil WPT systems are composed of three circuits (usually tuned at the same resonance frequency to reduce the losses due to reactive effects), one containing the source, the other containing the load, and one intermediary (relay circuit), where all are coupled to the adjacent ones by their respective mutual inductances.Independently of the number of coils used, a typical WPT system is usually designed aiming optimal efficiency (η), which can be defined as the power delivered to the load circuit divided by the total power supplied by the source. Alternatively, the WPT systems can be designed optimizing their power transfer capability (P Ã ), which can be defined as the power delivered to the load circuit divided by the maximum ideal amount of power which can be delivered to the same load circuit.However, in some applications, the mutual inductance between the coils may vary because the relative position of the coils is not fixed. 12,13 In the same way, the load characteristics may vary with time or may be dependent on the employed remote device. Implantable medical devices 2,14 and electric vehicles charging 1,12,13,15,16 schemes, which

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“…As possible losses due to reactive effects should be reduced, it is usual to consider all circuits tuned at the same angular frequency (

ω^{- 1} = \sqrt{L_{1} C_{1}} = \sqrt{L_{2} C_{2}} = \sqrt{L_{3} C_{3}}

) and to neglect the influence of non‐adjacent mutual inductances (

M_{13} = 0

M_{13}

can be minimized increasing the operating distance between coils and/or coil size/arrangement reducing the coupling between

L_{1}

and

L_{3}

.…”

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

A simple method to control automatically the performance of three‐coil wireless power transfer systems without direct output measurement

Garcia

Abatti

2022

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…For example, references [14] and [15] use ultrahigh-frequency (UHF) to improve output power and system efficiency. However, at UHF, a series of problems, such as increased switching device loss, circuit stray parameter changes, impedance matching, and skin effect, is more prominent [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of wireless power supply system for high‐voltage transmission lines across 500‐kV insulator distance

Tan

Zhi-jun

Shen

et al. 2023

IET Power Electronics

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The energy harvesting of ultra‐high voltage transmission lines and wireless power transmission technology are effective means to solve the stable energy supply of outdoor tower equipment. However, there are inevitably technical problems such as long transmission distance, weak coupling, and parameter sensitivity. In this paper, an effective design approach for a power demand‐oriented long‐distance wireless power transmission system is proposed. With the goal of transmitting power, a system equivalent parameter model is established to address the sensitivity of design parameters for the point‐to‐point long‐distance wireless power transmission system, and the main influencing factors that lead to system power transmission failure are analyzed. To effectively address the impact of high‐sensitivity parameters, a fast‐tuning method with redundant capacitance matrix compensation is proposed, which improves the deviation problem in system parameter design, improves the efficiency of offset parameter matching, and analyzes the impact of wireless energy transmission systems on high‐voltage insulator strings. Finally, an experimental platform was constructed to achieve power transmission at a distance of not less than 5 m at a resonant frequency of 50 kHz. The transmission efficiency met the design expectations and verified the effectiveness of the analysis.

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“…In order to solve such problems, scholars at home and abroad have conducted extensive research on underwater robots. Research focuses include compensation topology [5,6], coil optimization [7][8][9][10][11], foreign body detection [12][13][14], biological contamination [15], and safety issues [16]. In these areas, coil optimization is critical to increasing the overall efficiency of WPT systems and minimizing the size, weight, and cost of WPT systems, especially for receivers with limited requirements.…”

Section: Introductionmentioning

confidence: 99%

Review of Crucial Problems of Underwater Wireless Power Transmission

Liu

Sun

et al. 2022

Electronics

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In order to solve the problem of energy supply for underwater equipment, wireless power transmission technology is becoming a new way of underwater power transmission. It has incomparable technical advantages over traditional power supply method, and can effectively improve the safety, reliability, convenience and concealment of power supply for underwater equipment. The WPT has a natural electrical isolation between the primary and secondary sides to ensure safe charging in an underwater environment. This breakthrough technology greatly facilitates power transmission in the deep sea. However, current transmission power and efficiency levels are not at the level of WPT systems in air. Based on the analysis of the development status of underwater wireless power transmission technology, this paper firstly puts forward the challenges of underwater wireless power transmission, and summarizes the electromagnetic coupler structure, underwater docking mode, compensation topology, control method and eddy current loss. The current research hotspots in the field of underwater wireless power transmission are summarized and analyzed. Finally, according to the development trend of technology, the urgent technical problems in underwater wireless power transmission are expounded.

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Optimization on Three-Coil Long-Range and Dimension-Asymmetric Wireless Power Transfer System

Cited by 21 publications

References 22 publications

A simple method to control automatically the performance of three‐coil wireless power transfer systems without direct output measurement

A simple method to control automatically the performance of three‐coil wireless power transfer systems without direct output measurement

Design and analysis of wireless power supply system for high‐voltage transmission lines across 500‐kV insulator distance

Review of Crucial Problems of Underwater Wireless Power Transmission

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