A Review of the Current State of Technology of Capacitive Wireless Power Transfer

Lecluyse, Cédric; Minnaert, Ben; Kleemann, Michael

doi:10.3390/en14185862

Cited by 46 publications

(69 citation statements)

References 92 publications

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“…WPT over longer distances, e.g., 15 cm, requires several unfavorable techniques, such as high voltages, large plates, high switching frequencies, and high electric fields. The latter causing safety concerns for the surrounding area [ 15 , 16 ].…”

Section: Electromagnetic-coupled Technologiesmentioning

confidence: 99%

Wireless Power Transfer: Systems, Circuits, Standards, and Use Cases

Mulders¹,

Delabie²,

Lecluyse³

et al. 2022

Sensors

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Wireless power transfer provides a most convenient solution to charge devices remotely and without contacts. R&D has advanced the capabilities, variety, and maturity of solutions greatly in recent years. This survey provides a comprehensive overview of the state of the art on different technological concepts, including electromagnetic coupled and uncoupled systems and acoustic technologies. Solutions to transfer mW to MW of power, over distances ranging from millimeters to kilometers, and exploiting wave concepts from kHz to THz, are covered. It is an attractive charging option for many existing applications and moreover opens new opportunities. Various technologies are proposed to provide wireless power to these devices. The main challenges reside in the efficiency and range of the transfer. We highlight innovation in beamforming and UV-assisted approaches. Of particular interest for designers is the discussion of implementation and operational aspects, standards, and safety relating to regulations. A high-level catalog of potential applications maps these to adequate technological options for wireless power transfer.

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Section: Electromagnetic-coupled Technologiesmentioning

confidence: 99%

Wireless Power Transfer: Systems, Circuits, Standards, and Use Cases

Mulders¹,

Delabie²,

Lecluyse³

et al. 2022

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…Identifying resonance in the circuit is key to enhancing the efficiency, as it minimizes the reactance and improves the power flow. The basic compensation networks of the WPT include series-series (SS), series-parallel (SP), parallel-series (PS), and parallel-parallel, which are applied to eliminate the reactive component at the coupling section [22]. The selection of these compensation networks relies on the coupling capacitance and the topologies.…”

Section: Frequency Splitting In Wpt Systemsmentioning

confidence: 99%

8-Plate Multi-Resonant Coupling Using a Class-E2 Power Converter for Misalignments in Capacitive Wireless Power Transfer

Bezawada

Dhali

2022

Electronics

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Misalignment is a common issue in wireless power transfer systems. It shifts the resonant frequency away from the operating frequency that affects the power flow and efficiency from the charging station to the load. This work proposes a novel capacitive wireless power transfer (CPT) using an 8-plate multi-resonant capacitive coupling to minimize the effect of misalignments. A single-active switch class-E2 power converter is utilized to achieve multi-resonance through the selection of different resonant inductors. Simulations show a widening of the resonant frequency band which offers better performance than a regular 4-plate capacitive coupling for misalignments. The hardware results of the 8-plate multi-resonant coupling show an efficiency of 88.5% for the 20.8 W test, which is 18.3% higher than that of the regular 4-plate coupling. Because of the wider resonant frequency band {455–485 kHz}, compared with the regular 4-plate coupling, the proposed design minimized the output voltage drop by 15% for a 10% misalignment. Even for large misalignments, the 8-plate performance improved by 40% compared with the 4-plate coupling.

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“…The CPT technique has raised significant concern in recent years due to its advantages of low cost, low weight, insensitivity to conductive barriers and misalignment of the coupler [14][15][16]. Research about the capacitive coupler and the comparisons between IPT and CPT was reported in [17].…”

Section: Introductionmentioning

confidence: 99%

A Novel Compensation Circuit for Capacitive Power Transfer System to Realize Desired Constant Current and Constant Voltage Output

et al. 2022

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Capacitive power transfer (CPT) technique possesses the advantages of safety, isolation, low cost, and insensitivity to conductive barriers. To charge lithium-ion batteries, CPT should possess the output profile consisting of first constant current (CC) output and later constant voltage (CV) output. To fulfill the output profile, many power switches or compensation components are added in the CPT circuit, which is not expected due to the bulky size and additional losses. To reduce the redundancy of the CPT system, an Lx-PS CPT circuit with only five compensation components is proposed in this paper. After a systematic analysis and a parameter design procedure, the proposed CPT circuit can realize input ZPA at both CC and CV modes. In addition, the output current at CC mode and the output voltage at CV mode are all adjustable based on the charging demands of different loads. Finally, simulations are done to prove the analysis in this paper. Compared to previous research, the CPT circuit proposed in this paper can not only achieve the charging demands of lithium-ion batteries, but also reduce the redundancy of the whole system.

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A Review of the Current State of Technology of Capacitive Wireless Power Transfer

Cited by 46 publications

References 92 publications

Wireless Power Transfer: Systems, Circuits, Standards, and Use Cases

Wireless Power Transfer: Systems, Circuits, Standards, and Use Cases

8-Plate Multi-Resonant Coupling Using a Class-E2 Power Converter for Misalignments in Capacitive Wireless Power Transfer

A Novel Compensation Circuit for Capacitive Power Transfer System to Realize Desired Constant Current and Constant Voltage Output

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