Quasi‐duality between SS and SP topologies of basic electric‐field coupling wireless power transfer system

Ishihara, Masataka; Umetani, Kazuhiro; Umegami, Hirokatsu; Hiraki, Eiji; Yamamoto, Masaaki

doi:10.1049/el.2016.1253

Cited by 14 publications

(5 citation statements)

References 4 publications

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“…In order to improve the transmission efficiency, various adaptive resonance frequency methods have been proposed [12][13][14][15]. Different equivalent circuit models with asymmetrical structures were established to improve the transmission efficiency and the transmission distance [16][17][18]. By the impedance analysis of MCR-WPT, methods of suppressing or eliminating the frequency splitting phenomenon were subsequently discussed.…”

Section: Introductionmentioning

confidence: 99%

Frequency Splitting and Transmission Characteristics of MCR-WPT System Considering Non-Linearities of Compensation Capacitors

Liu

Wang

et al. 2020

Electronics

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The frequency splitting phenomenon and transmission characteristics have been research hotspots in the field of magnetically coupled resonance wireless power transfer (MCR-WPT). In this paper, non-linear dynamics theory was innovatively introduced into the research, and non-linear coupled transmission dynamics modelling of the MCR-WPT system was established considering the non-linearities of the compensation capacitor. The mechanism of the frequency splitting phenomenon of the MCR-WPT system was revealed through systematic mathematical analyses based on the modelling. The analysis results showed that the system usually has dual natural frequencies which are low resonance frequency and high resonance frequency. Based on non-linear dynamics theory, the transmission characteristics of the system with different non-linear parameters were discussed comprehensively in relation to the modelling. The results of the numerical simulations and theoretical analyses showed that non-linear parameters can cause the jumping phenomena with the output responses, and the output responses in the vicinities of the lower resonance frequencies were extremely sensitive to changes in the coupling coefficient. According to analyses of the linear and non-linear systems, the energy transmissions performed in the vicinity of the high resonance frequency had a wider working frequency band and a better transmission stability under non-linear conditions.

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Section: Introductionmentioning

confidence: 99%

Frequency Splitting and Transmission Characteristics of MCR-WPT System Considering Non-Linearities of Compensation Capacitors

Liu

Wang

et al. 2020

Electronics

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“…From then on, considerable progress has been made in the field of wireless power transfer. The technologies include inductive power transfer [2,3], electrical-field coupled wireless power transfer [4,5], magnetic coupling resonance wireless power transfer (MCR-WPT) [6,7], microwave wireless power transfer [8], etc. MCR-WPT technology was introduced in 2007 [9], and it has attracted much attention in conducting several studies and developing different applications [10].…”

Section: Introductionmentioning

confidence: 99%

Achieving the Constant Output Power and Transfer Efficiency of a Magnetic Coupling Resonancewireless Power Transfer System Based on the Magnetic Field Superposition Principle

Liu¹,

Tan²,

Liu³

2019

PIER M

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The output power of a magnetic coupling resonance wireless power transfer (MCR-WPT) system attains the maximum value at two frequencies splitting in an over-coupled region. To achieve suitable transfer characteristics, impedance compensation methods have been used in MCR-WPT domain. In securing the constant output power and transfer efficiency in a constant frequency mode, a topology of the MCR-WPT system with two transmitting coils is employed. First, the circuit model is designed while evaluating the transmission characteristics. Second, when the two transmitting coils are placed into the transmitting loop, the main transmitter and sub-transmitter loops are created by sharing the same transmitter. The use of two transmitting coils to achieve a magnetic field superposition is investigated. Constant output power and transfer efficiency are then investigated in a constant frequency mode. Finally, the experimental equipment is designed. Experimental results confirm the effectiveness and robustness of the topology. Such a topology can be optimized for the transfer performance by itself and can achieve constant output power and transfer efficiency. If the distance between the two transmitting coils is appropriate and the receiving coil moves between the two transmitting coils, the fluctuation of the output power and transfer efficiency of the MCR-WPT system is less than 5%.

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“…From then on, the technology has made considerable progress. It includes inductive power transfer (Bosshard and Kolar, 2019), electrical-field coupled wireless power transfer (Ishihara et al, 2016), magnetic coupling resonance wireless power transfer (MCR-WPT) (Kurs et al, 2007), and microwave wireless power transfer (Brown, 1984). In 2007, when the MCR-WPT technology was introduced (Kurs et al, 2007), it could be extended to military, electric vehicles and other fields, owing to the advantages of higher transfer efficiency, bigger transfer power, smaller electromagnetic radiation and longer transfer distance (Karalis et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Transfer characteristics of the MCR-WPT system using two series transmitting coils

Liu

2019

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Purpose The impedance compensation approaches have been adopted to achieve the maximum output power and transfer efficiency in many magnetic coupling resonance wireless power transfer projects. However, it remains a challenge to obtain the constant output power and transfer efficiency in a fixed-frequency mode during variations in transfer distance and orientation of the coils. In this paper, using two series transmitting coils to achieve the constant output power and transfer efficiency is used. Design/methodology/approach First, the circuit model is established and transfer characteristics are studied. Second, using the two series transmitting coils to achieve the constant output power and transfer efficiency is investigated. Finally, the experimental system is designed; it can optimize the transfer performances by itself; the constant output power and transfer efficiency are achieved in the fixed-frequency mode. Findings When the receiving coil moves between the two series transmitting coils, the tolerance of the output power and transfer efficiency is less than 5 per cent. Research limitations/implications When a receiving coil is placed between the two series transmitting coils, there are space limits. The receiving coil only shifts between the two transmitting coils. Practical implications However, the rail guide vehicle may achieve constant output power and transfer efficiency when it moves on the rail guide. So, this topology may provide a practical solution. Originality/value In this research, the three-coil MCR-WPT system including two series transmitting coils is presented. In a fixed-frequency mode, the constant output power and transfer efficiency is achieved in experiments during variations in transfer distance and orientation of the coils. The fluctuation of the output power and transfer efficiency is less than 5 per cent.

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Quasi‐duality between SS and SP topologies of basic electric‐field coupling wireless power transfer system

Cited by 14 publications

References 4 publications

Frequency Splitting and Transmission Characteristics of MCR-WPT System Considering Non-Linearities of Compensation Capacitors

Frequency Splitting and Transmission Characteristics of MCR-WPT System Considering Non-Linearities of Compensation Capacitors

Achieving the Constant Output Power and Transfer Efficiency of a Magnetic Coupling Resonancewireless Power Transfer System Based on the Magnetic Field Superposition Principle

Transfer characteristics of the MCR-WPT system using two series transmitting coils

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