Positional characteristics of capacitive power transfer as a resonance coupling system

Komaru, Takashi; Hidenori, Akita

doi:10.1109/wpt.2013.6556922

Cited by 39 publications

(15 citation statements)

References 3 publications

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“…To increase the self-capacitances and eliminate the external capacitances, the primary plates P 1 and P 2 are placed close to each other [88,89]. Similarly, the distance between secondary plates P 3 and P 4 is also reduced, as shown in Figure 24.…”

Section: Four-plate Stacked Structurementioning

confidence: 99%

A Review on the Recent Development of Capacitive Wireless Power Transfer Technology

2017

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Capacitive power transfer (CPT) technology is an effective and important alternative to the conventional inductive power transfer (IPT). It utilizes high-frequency electric fields to transfer electric power, which has three distinguishing advantages: negligible eddy-current loss, relatively low cost and weight, and excellent misalignment performance. In recent years, the power level and efficiency of CPT systems has been significantly improved and has reached the power level suitable for electric vehicle charging applications. This paper reviews the latest developments in CPT technology, focusing on two key technologies: the compensation circuit topology and the capacitive coupler structure. The comparison with the IPT system and some critical issues in practical applications are also discussed. Based on these analyses, the future research direction can be developed and the applications of the CPT technology can be promoted.

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Section: Four-plate Stacked Structurementioning

confidence: 99%

A Review on the Recent Development of Capacitive Wireless Power Transfer Technology

2017

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“…This can be achieved by adding repeater plates [24]. According to the structure reported above, the dynamic positional variation of the transceiver device will change the value of the coupling capacitors, thereby affecting the power transmission [25][26][27]. Moreover, the output power will be limited by the small capacitance, which is determined by the plate area and distance.…”

Section: Introductionmentioning

confidence: 99%

Design of capacitive coupling structure for position‐insensitive wireless charging

Gao

Xie

et al. 2020

IET Power Electronics

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The Internet of Things (IoT) connects billions of smart devices through wireless sensor networks (WSNs). However, to ensure the power supply for numerous passive devices in a WSN, it is necessary to replace batteries periodically, which will undoubtedly increase maintenance costs. This study proposes a capacitive coupling structure that is different from the previous capacitive power transfer (CPT) structures. The proposed structure can allow the positional variation of the receiver, and multiple receivers to be charged at the same time. Both theoretical and experimental results demonstrate that the power transmission is less affected by the positional variation of the pickup plates in the vertical and horizontal directions. In this study, all coupling capacitors between the plates are considered and the equivalent circuit model is derived. Further output characteristics of the circuit are derived and analysed. The dimensions of the structure are designed and simulated by using the EM full wave simulation. A prototype is designed to verify that a battery can be charged based on capacitive coupling. A 60 mAh rechargeable lithium-ion button battery is fully charged in 250 min, and the output power is ∼36 mW during charging.

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“…However, for certain applications (e.g., electric vehicles [6]), CPT might be preferable to IPT because it has the following advantages [5,[7][8][9][10][11][12]:…”

Section: Introductionmentioning

confidence: 99%

Conjugate Image Theory Applied on Capacitive Wireless Power Transfer

Minnaert

Stevens

2017

Energies

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Wireless power transfer using a magnetic field through inductive coupling is steadily entering the market in a broad range of applications. However, for certain applications, capacitive wireless power transfer using electric coupling might be preferable. In order to obtain a maximum power transfer efficiency, an optimal compensation network must be designed at the input and output ports of the capacitive wireless link. In this work, the conjugate image theory is applied to determine this optimal network as a function of the characteristics of the capacitive wireless link, as well for the series as for the parallel topology. The results are compared with the inductive power transfer system. Introduction of a new concept, the coupling function, enables the description of the compensation network of both an inductive and a capacitive system in two elegant equations, valid for the series and the parallel topology. This approach allows better understanding of the fundamentals of the wireless power transfer link, necessary for the design of an efficient system.

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Positional characteristics of capacitive power transfer as a resonance coupling system

Cited by 39 publications

References 3 publications

A Review on the Recent Development of Capacitive Wireless Power Transfer Technology

A Review on the Recent Development of Capacitive Wireless Power Transfer Technology

Design of capacitive coupling structure for position‐insensitive wireless charging

Conjugate Image Theory Applied on Capacitive Wireless Power Transfer

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