Modelling of wireless power transfer links based on capacitive coupling

Dionigi, Marco; Mongiardo, M.; Monti, Giuseppina; Perfetti, R.

doi:10.1002/jnm.2187

Cited by 15 publications

(19 citation statements)

References 20 publications

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“…First, we notice that, if one receiver is absent or uncoupled (e.g., C 13 = C 23 = 0), the results of Table 1 correspond to the solutions for a CWPT system with one transmitter and one receiver [16].…”

Section: Numerical Verificationmentioning

confidence: 90%

“…With this assumption, we can consider the system as two separate CWPT systems, each with one transmitter and one receiver. It was demonstrated in [16], using values of inductance given by Equation (2), that the optimal loads to achieve both maximum power and efficiency occur when the imaginary parts of the system equate to zero. For the configuration with uncoupled receivers, we can therefore replace the admittances Y 2 and Y 3 with the conductances G 2 and G 3 .…”

Section: Uncoupled Configurationmentioning

confidence: 99%

“…For a wireless power transfer system, two configurations are typically being pursued [15,16]. One can construct a wireless power transfer system that maximizes the amount of transferred power to the receiver, for example, for biomedical implants.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Analytical Solution for a Capacitive Wireless Power Transfer System with One Transmitter and Two Receivers

Minnaert

Stevens

2017

Energies

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Wireless power transfer from one transmitter to multiple receivers through inductive coupling is slowly entering the market. However, for certain applications, capacitive wireless power transfer (CWPT) using electric coupling might be preferable. In this work, we determine closed-form expressions for a CWPT system with one transmitter and two receivers. We determine the optimal solution for two design requirements: (i) maximum power transfer, and (ii) maximum system efficiency. We derive the optimal loads and provide the analytical expressions for the efficiency and power. We show that the optimal load conductances for the maximum power configuration are always larger than for the maximum efficiency configuration. Furthermore, it is demonstrated that if the receivers are coupled, this can be compensated for by introducing susceptances that have the same value for both configurations. Finally, we numerically verify our results. We illustrate the similarities to the inductive wireless power transfer (IWPT) solution and find that the same, but dual, expressions apply.

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Section: Numerical Verificationmentioning

confidence: 90%

Section: Uncoupled Configurationmentioning

confidence: 99%

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Optimal Analytical Solution for a Capacitive Wireless Power Transfer System with One Transmitter and Two Receivers

Minnaert

Stevens

2017

Energies

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“…It can depend on the application whether the maximum efficiency or maximum power transfer solution is preferable. For example, for the wireless charging of biomedical implants, the maximum power configuration may be preferable, whereas for the wireless charging of electric vehicles, the maximum efficiency configuration is more appropriate [14,22]. In the next section, we will indicate the complex conjugate with a star: Z * is the complex conjugate of Z.…”

Section: Conjugate Image Values For the Series Topologymentioning

confidence: 99%

“…In other words, it allows choosing the ports at which you connect supply and load. Often, this design requirement is not imposed, and one can simply omit R s1 , which leads to a doubling of the efficiency and corresponds to the maximum efficiency configuration of the wireless power system [22].…”

Section: Figurementioning

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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Enhancement of capacitive accelerometer operation by parameters improvement

Ghemari

Saad

2019

Int J Numerical Modelling

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In the present paper, a mathematical model suitable for capacitive accelerometer is developed by applying the fundamental principle of dynamics and validated by simulation and experiment test. This model aims to visualize the capacitance variation of the accelerometer as a function of relative movement frequency. The main motivation key role of this paper is to propose a capacitive accelerometer with improved parameters. Therefore, in capacitive detection, the damping rate choice is directly influenced by the variation in capacitance; for this purpose, a comparative study of three damping rates is carried out. The first accelerometer is used in practical tests, the second is presented and studied in recent literature, and the third is the accelerometer proposed in this work. A new expression is extracted from the damping ratio as a function of measurement error to determine the damping rate according to a desired measurement error value. Finally, a new capacitive accelerometer with improved parameters having many advantages over the existing accelerometers is obtained. Simulation and experimental results have enabled us to recommend a new capacitive accelerometer design with very low measurement error (limited to 0.25%), high accuracy (equal to 99.75%), high sensitivity and reliability, and low electrical energy consumption.

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Modelling of wireless power transfer links based on capacitive coupling

Cited by 15 publications

References 20 publications

Optimal Analytical Solution for a Capacitive Wireless Power Transfer System with One Transmitter and Two Receivers

Optimal Analytical Solution for a Capacitive Wireless Power Transfer System with One Transmitter and Two Receivers

Conjugate Image Theory Applied on Capacitive Wireless Power Transfer

Enhancement of capacitive accelerometer operation by parameters improvement

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