Gain Expressions for Capacitive Wireless Power Transfer with One Electric Field Repeater

Minnaert, Ben; Monti, Giuseppina; Costanzo, Alessandra; Mongiardo, M.

doi:10.3390/electronics10060723

Cited by 4 publications

(18 citation statements)

References 27 publications

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“…For larger distances, more repeaters can be added. Each repeater segment introduces additional power losses, thus maintaining efficiency forms the main challenge [ 100 , 101 ]. Similar to the magnetic field repeater, the formulas for the overall efficiency can be derived by using an equivalent scheme for the capacitive coupler.…”

Section: Range Power and Efficiency-increasing 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: Range Power and Efficiency-increasing Technologiesmentioning

confidence: 99%

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

Mulders¹,

Delabie²,

Lecluyse³

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…The power gain G P or system efficiency is defined as the ratio of the power dissipated in the load to the power that the generator delivers to the two-port network. It can be expressed as function of the elements of the admittance matrix Y of the two-port network [6]:…”

Section: Power Gainmentioning

confidence: 99%

“…The shunt inductors L i are set so to make the capacitors C i resonating at f 0 . It can be calculated [6] that a maximum power gain is attained for a terminating load of 171 Ω. However, for this simulation, a non-optimal load of 50 Ω is chosen.…”

Section: Numerical Verificationmentioning

confidence: 99%

“…transfer of power available at the output port to the load. In our previous work [6], the gains of the system were maximized by acting on the input and output terminations of the ports, i.e., by choosing the optimal source and load impedances. The system itself (including the couplings between transmitter, repeater and receiver) were considered fixed and given.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Coupling for Capacitive Wireless Power Transfer with One Repeater

Minnaert

Monti

2022

2022 52nd European Microwave Conference (EuMC)

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In order to extend the range of capacitive wireless power transfer, an electric field repeater between transmitter and receiver can be applied. In this work, a network formalism is adopted to analytically describe and maximize the system efficiency of a repeater setup. The resonator components, resistive losses, load and supply impedances are considered fixed and given. The efficiency is varied by acting on the coupling between transmitter, repeater and receiver only. It is found that it is only possible to optimize the system by varying the coupling between repeater and receiver while keeping the coupling between transmitter and repeater fixed. A condition, dependent on the value of the load, is determined for which the maximization solution exists. The analytical solution is verified through circuital simulations.

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“…The aforementioned structures are capable of transmitting energy over a distance of a few millimeters to about ten centimeters. To cover greater distances, an electric field repeater can be used [20,49,69]. This repeater or relay is not galvanically connected to the transmitter or receiver and allows for an intermediate extension of the electric field.…”

Section: Electric Field Repeatermentioning

confidence: 99%

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

2021

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Wireless power transfer allows the transfer of energy from a transmitter to a receiver without electrical connections. Compared to galvanic charging, it displays several advantages, including improved user experience, higher durability and better mobility. As a result, both consumer and industrial markets for wireless charging are growing rapidly. The main market share of wireless power is based on the principle of inductive power transfer, a technology based on coupled coils that transfer energy via varying magnetic fields. However, inductive charging has some disadvantages, such as high cost, heat dissipation, and bulky inductors. A promising alternative is capacitive wireless power transfer that utilizes a varying electric field as medium to transfer energy. Its wireless link consists of conductive plates. The purpose of this paper is to review the state of the art, link the theoretical concepts to practical cases and to indicate where further research is required to take next steps towards a marketable product. First, we describe the capacitive link via a coupling model. Next, we highlight the recent progress in plate topologies. Additionally, the most common compensation networks, necessary for achieving efficient power transfer, are reviewed. Finally, we discuss power electronic converter types to generate the electric field.

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Gain Expressions for Capacitive Wireless Power Transfer with One Electric Field Repeater

Cited by 4 publications

References 27 publications

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

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

Optimal Coupling for Capacitive Wireless Power Transfer with One Repeater

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

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