Capacitive Power Transfer System with Reduced Voltage Stress and Sensitivity

Mostafa, Tarek M.; Bui, Dai; Muharam, Aam; Hattori, Reiji; Hu, Aiguo Patrick

doi:10.3390/app8071131

Cited by 11 publications

(9 citation statements)

References 24 publications

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“…For instance, the effects of electric field emissions are considered in living tissues for biomedical applications [188][189][190], and the human safety concept for electric vehicle charging applications [191]. Mostafa et al aimed at reducing voltage stress on metal plates in secondary side of the CPT system using CL network [192], using step-down transformer [193], and utilizing buck converter [194] to provide less system sensitivity in low power applications. Luo et al suggest an optimization method to improve the component values [195,196] and investigate network design to obtain maximum power transfer in high power CPT applications [197].…”

Section: ) Voltage Stressmentioning

confidence: 99%

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A Comprehensive Review on Wireless Capacitive Power Transfer Technology: Fundamentals and Applications

et al. 2022

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Capacitive power transfer (CPT) technology is becoming increasingly popular in various application areas. Due to its limitations, such as low frequency, low coupling capacitance, and the high voltage stress on metal plates, the studies on high power CPT applications fell behind previously. Therefore, the wideband gap (WBG) semiconductor devices and the compensation topologies are further adopted to tackle these limitations. The main purpose of the paper is to review CPT applications in terms of performance parameters, advantages, disadvantages and also challenges. Initially, the basic principles of CPT technology are examined, which cover compensation topologies, coupler structures, transfer distance, power electronic components, and system control methods. Then, CPT applications are evaluated for performance parameters (i.e., power level, operation frequency, system efficiency, transfer distance) along with compensation types, inverter types, and coupler types. The applications are categorized into six main groups according to industrial topics as safety, consumer electronics, transport, electric machines, biomedical, and miscellaneous. Herein, power level changes from µW to kW ranges, the operation frequency varies from 100s of kHz to 10s of MHz ranges as well. The maximum system efficiency is recorded as 97.1 %. The transfer distance varies from µm range to 100s of mm ranges. The full-bridge inverter topology and four-plate coupler structure are noticeable in CPT applications. Finally, advantages, disadvantages, and challenges of CPT applications are evaluated in detail. This review is expected to serve as a reference for researchers who study on CPT systems and their applications.INDEX TERMS Capacitive power transfer, capacitive coupling, wireless power transfer.MEHMET ZAHID EREL was born in Sakarya, Turkey. He received the B.S. degree in electrical engineering from the Yildiz Technical University, Istanbul, Turkey, in 2013, and the M.S. degree in electronics and communication engineering from the Ankara Yildirim Beyazit University, Ankara, Turkey, in 2016. He is currently pursuing the Ph.D. degree with the department of electrical and electronics engineering,

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Section: ) Voltage Stressmentioning

confidence: 99%

“…In summary, voltage stress applications are mainly considered for human safety reducing electric field emissions. Voltage stress 5W [35,192], 10W [194,200], 25W [193], 40 W [199], 60 W [198], 180 W [41], 1kW [195],…”

Section: ) Voltage Stressmentioning

confidence: 99%

A Comprehensive Review on Wireless Capacitive Power Transfer Technology: Fundamentals and Applications

et al. 2022

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“…The output voltage of the HWPT fluctuated from 20 V to 28 V, while conventional CPT fluctuated from 4 V to 22 V. Thus, the proposed system was much less sensitive to pressure change, and at the same time, relatively higher system efficiency was achieved. With the same purpose, Mostafa et al in [81] proposed a DC-DC buck converter on the secondary side of the CPT system to reduce the voltage and electric field across the interface, the Q-factor, and thus, the system sensitivity. By mathematical analysis and simulation, they found that by reducing the duty cycle of the buck converter at a constant output power, the voltage across the plates could be significantly reduced, and the circuits became less sensitive to the variations in parameters.…”

Section: Boost Up Circuitsmentioning

confidence: 99%

Electromagnetic Field Based WPT Technologies for UAVs: A Comprehensive Survey

Nguyen

Truong

et al. 2020

Electronics

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Wireless power transfer (WPT) techniques are important in a variety of applications in both civilian and military fields. Unmanned aerial vehicles (UAVs) are being used for many practical purposes, such as monitoring or delivering payloads. There is a trade-off between the weight of the UAVs or their batteries and their flying time. Their working time is expected to be as long as possible. In order to support the UAVs to work effectively, WPT techniques are applied with UAVs to charge secondary energy supply sources in order to increase their working time. This paper reviews common techniques of WPT deployed with UAVs to support them while working for different purposes. Numerous approaches have been considered to illustrate techniques to exploit WPT techniques. The charging distances, energy harvesting techniques, electronic device improvements, transmitting issues, etc., are considered to provide an overview of common problems in utilizing and charging UAVs. Moreover, specific problems are addressed to support suitable solutions with either techniques or applications for UAVs.

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“…Also, at a low Q , tuning to the resonant frequency is more attainable practically. To have a less sensitive system, it is recommended to use Q ≤6 [12] which can be easily achieved by just choosing n ≥2 for the chosen values of this design example. The recommended Q will vary depending on the situation and the system design parameters.…”

Section: Mathematical Analysismentioning

confidence: 99%

“…Fig. 2 shows the structure of the typical CPT system [1,[10][11][12][13]. In case the capacitive interface has no air gap between the plates, it has the value typically in the range of hundreds of pico-Farads while it can reduce to few tens of Pico Farads for air gap existence case.…”

Section: Introductionmentioning

confidence: 99%

Improved CPT system with less voltage stress and sensitivity using a step‐down transformer on receiving side

Mostafa

Muharam

et al. 2019

IET Power Electronics

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This paper proposes a capacitive power transfer (CPT) system with a step-down transformer on the secondary side to reduce the circuit quality factor (Q), and thereby reduce the sensitivity to parameters variations, as well as the voltage stress across the coupling interface. The system operating principle is analyzed mathematically, and the focus is given to understand the effect of the leakage inductance (L lk) of the non-ideal transformer on the system performance. The analytical and simulation results show that at a given constant output power, the voltage across the plates is significantly reduced, and the system becomes less sensitive to the coupling variations by increasing the turns ratio of the step-down transformer. It is found that L lk can be advantageously utilized as a tuning inductor (L) or part of it. The proposed method is verified by building a prototype CPT system that delivered 25 W at an operation frequency of 1 MHz, and an efficiency of more than 70%. Simultaneously, the voltage stress across the single pair of the coupling plates is reduced from 252 V of a conventional CPT system without a stepdown transformer, to 50.4 V using a high-frequency transformer with a turns ratio of 5.

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Capacitive Power Transfer System with Reduced Voltage Stress and Sensitivity

Cited by 11 publications

References 24 publications

A Comprehensive Review on Wireless Capacitive Power Transfer Technology: Fundamentals and Applications

A Comprehensive Review on Wireless Capacitive Power Transfer Technology: Fundamentals and Applications

Electromagnetic Field Based WPT Technologies for UAVs: A Comprehensive Survey

Improved CPT system with less voltage stress and sensitivity using a step‐down transformer on receiving side

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