Capacitive Power Transfer based on Compensation Circuit for Class E Resonant Full-Wave Rectifier

Domingos, Fabiano Cezar; Freitas, Susanna de Campos de Vital; Mousavi, Pedram

doi:10.1109/wpt.2018.8639314

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…Class E full-bridge rectifier has lower diode conduction loss, higher power density, and higher frequency rectification than class E half-bridge rectifier [167]. Thus, Domingos et al propose a class E full-bridge rectifier for CPT applications [168]. Active variable reactance (AVR) rectifier structure is suggested in wireless capacitive power transfer applications to compensate for large misalignment conditions and distance variations among couplers [169,170].…”

Section: ) Rectifiersmentioning

confidence: 99%

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: ) Rectifiersmentioning

confidence: 99%

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

et al. 2022

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“…In addition to common bridge-type inverters, power amplifiers such as class D, class E, class E 2 , and class φ can also achieve a high-frequency conversion [43][44][45][46][47][48][49][50] that also can be used in CPT systems. Class E amplifiers have remarkable features such as high frequency, high efficiency, and simple structure, and can be soft-switched to reduce switching losses and improve system efficiency.…”

Section: High-frequency Convertermentioning

confidence: 99%

Research and Application of Capacitive Power Transfer System: A Review

Wang

Zhang

et al. 2022

Electronics

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Capacitive power transfer (CPT) uses an electric field as the transfer medium to achieve wireless power transfer (WPT). Benefitting from the low eddy current loss, simple system structure and strong plasticity of the coupling coupler, the CPT system has recently gained much attention. The CPT system has significantly improved transfer power, system efficiency, and transfer distance due to continuous research and discussion worldwide. This review briefly presents the basic working principle of the CPT system and summarizes the theoretical research in four aspects, including coupling coupler and high-frequency power converter. Following this, the review focuses on research in six key directions, including system modelling and efficiency optimization. The application of CPT technology in five fields, including medical devices and transportation, is also discussed. This review introduces the progress of CPT research in recent years, hoping to serve as a reference for researchers, to promote the further research and application of the CPT system.

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“…Unlike inductive coils that generate magnetic fields around its core, coupling plates tend to contain electric fields within the coupling section area. In order to achieve effective capacitive coupling, the medium is considered dielectric with a transfer distance of 1 mm [19][20][21][22][23]. This increases the coupling capacitance and ultimately overcomes the requirement of high voltage to the coupling section.…”

Section: Review Of Capacitive Coupling Structuresmentioning

confidence: 99%

“…Capacitive films are a better substitute for bulky and expensive ferrite cores. Additionally, capacitive coupled transfer distance of 1 mm [19][20][21][22][23]. This increases the coupling capacitance and ultimately overcomes the requirement of high voltage to the coupling section.…”

Section: Introductionmentioning

confidence: 99%

A Case Study: Influence of Circuit Impedance on the Performance of Class-E2 Resonant Power Converter for Capacitive Wireless Power Transfer

Bezawada

Zhang

2021

Electronics

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The evolution of power electronics led to rapid development in wireless charging technology; as a result, a single active switch topology was introduced. The present market utilizes inductive wireless power transfer (IPT); because of the disadvantages of cost, size, and safety concerns, research on wireless power transfer was diverted towards capacitive wireless power transfer (CPT). This paper studies the optimal impedance tracking of the capacitive wireless power transfer system for maximum power transfer. Compared to prior methods developed for maximum power point tracking in power control, this paper proposes a new approach by means of finding impedance characteristics of the CPT system for a certain range of frequencies. Considering the drone battery as an application, a single active switch Class-E2 resonant converter with circular coupling plates is utilized. Impedance characteristics are identified with the help of equations related to the input and resonant impedance. The impedance tracking is laid out for various resonant inductors, and the difference in current peak is observed for each case. Simulations verify and provide additional information on the reactive type. Additionally, hardware tests provide the variation of input current and output voltage for a range of frequencies from 70 kHz to 300 kHz. Efficiency at the optimal impedance points for a resonant inductor with 50 μH and 100 μH are tested and analyzed. It is noted that the efficiency for a resonant inductor with 50 μH is 8% higher compared to the CPT with a 100 μH resonant inductor. Further hardware tests were performed to investigate the impact of frequency and duty cycle variation. Zero-voltage-switching (ZVS) limits have been discussed with respect to both frequency and duty cycle.

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Capacitive Power Transfer based on Compensation Circuit for Class E Resonant Full-Wave Rectifier

Cited by 6 publications

References 10 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

Research and Application of Capacitive Power Transfer System: A Review

A Case Study: Influence of Circuit Impedance on the Performance of Class-E2 Resonant Power Converter for Capacitive Wireless Power Transfer

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