Analytical model of mutual coupling between rectangular spiral coils with lateral misalignment for wireless power applications

Wu, Dehui; Qisheng, Sun; Wang, Xiaohong; Yang, Fan

doi:10.1049/iet-pel.2017.0470

Cited by 30 publications

(10 citation statements)

References 18 publications

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“…A notorious disadvantage that can be derived from Equations ( 9) and ( 10) is the dependency of both I 1 and I 2 on k. According to previous works [39][40][41][42], if some degree of misalignment exists or if the air gap between both coils is wider than expected, the value of k decreases. Consequently, there is an increase in both currents, which may lead to an unsafe operation.…”

Section: Mathematical Model For An Ss-compensated Couplermentioning

confidence: 99%

Monte-Carlo Analysis of the Influence of the Electrical Component Tolerances on the Behavior of Series-Series- and LCC-Compensated IPT Systems

et al. 2020

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The use of compensation networks increases the power transfer capability of inductive power transfer (IPT) systems in the battery charging process of electric vehicles (EVs). Among the proposed topologies, the Series-Series (SS) and the LCC networks are currently in widespread use in wireless battery chargers based on IPT systems. This paper focuses on the study of the behavior of both compensation topologies when they are detuned due to the tolerances of their components. To compare their performances, a Monte-Carlo analysis was carried out using Simulink and MATLAB. The tolerance values, assigned independently to each component, fall within a [ − 20 , 20] % range according to a normal distribution. Histograms and scatter plots were used for comparison purposes. The analysis reveals that the LCC network allows a tighter control over the currents that flow through the magnetic coupler coils. Moreover, it was found that the increments in those currents can be limited to some extent by selecting capacitors featuring low tolerance values in the LCC compensation. Nevertheless, the SS network remains an appropriate choice if size and cost are essential constraints in a given design.

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Section: Mathematical Model For An Ss-compensated Couplermentioning

confidence: 99%

Monte-Carlo Analysis of the Influence of the Electrical Component Tolerances on the Behavior of Series-Series- and LCC-Compensated IPT Systems

et al. 2020

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“…As previously explained, coil misalignment provokes changes in the magnetic flux that the coils concatenate. As a consequence, the mutual inductance and the induced voltage in the secondary coil are altered [25]. This variation impacts the performances of the power transfer and the communication system.…”

Section: Theoretical Analysis Of the Coil Misalignment Effects On Thementioning

confidence: 99%

Impact of Coil Misalignment in Data Transmission over the Inductive Link of an EV Wireless Charger

2018

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The penetration rate of electric vehicles (EVs) will experience a relative increment in the future, so easy to use ways to recharge will be demanded. In this sense, wireless charging represents a safe charging method that minimises user intervention. In a similar way to conductive charge, wireless charging requires some information exchange between the charger primary side and secondary side (battery) for safety and operational reasons. Thus, wireless chargers depend on a communication system for their controlled and correct operation. This paper analysed the communication performance of a wireless EV charger in which the communiction device is part of the wireless power transfer system. Particularly, this work studies how the communication system reacts to power coil displacements, which commonly occur in their conventional performance. The results show that the compensation topology selected to ensure the resonant operation clearly impacts on the communication performance. In particular, the theoretical model and the simulation results demonstrate that the asymmetrical compensation topologies are more stable in terms of the wireless communication channel capacity.Energies 2018, 11, 538 2 of 11 For this information exchange, wired communication is advised against, as it will eliminate the main benefits reported by the wireless chargers. Several wireless-based communication techniques have been proposed as alternatives. The more straightforward strategy consists of opting for some commercial wireless modules, which could be inserted in the primary and secondary sides. Coordination between the modules and some security drawbacks are the main concerns which could make this solution inoperative [7]. To obtain more reliable communication, these solutions can be complemented, or even avoided, by using the same wireless link that is involved with the wireless charger.Several papers have been published regarding the use of the coils for the simultaneous transmission of data and power in EV wireless chargers. In [8], the authors designed a scheme where both data and power are transmitted at the same time. Specifically, data and power are generated at different frequencies (1.6 MHz and 22.4 kHz, respectively). A similar scheme was published in [9]. Both schemes are complex to implement, as they have to add high-frequency data communication modules, extra coils and filters to separate the power and data processing accordingly. As demonstrated in [10,11], additional costs can be avoided if the power converters employed to create the high-frequency signal generate the data signal too. According to this strategy, data and power are transmitted at the same frequency. The work in [10] included experimental results which show how this kind of combination is feasible for a 700-W wireless charger operating at 22 kHz. In fact, the spectrum of the data signal is centered at the frequency in which the wireless charger resonates. On the other hand, the data protocol is based on the BFSK (Binary Frequency Shift Keying).As demonstrated ...

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“…Among polarized coils, the double-D (DD) design is preferred due to its simple structure, high efficiency, and low sensitivity in misalignment conditions [5]. To optimize a WPT system or estimate its operating parameters (such as received power, efficiency, and gain), the designer should accurately compute the self-and mutual inductances [6]. These computations could be carried out using analytical, numerical (finite element method [FEM]) [7], or hybrid analytical-numerical methods.…”

Section: Introductionmentioning

confidence: 99%

“…An analytical method to compute self-and mutual inductances of spiral rectangular coils is presented in [18]. However, it is rather complicated due to its dependence on computers and the need to set initial burdensome values [6]. A numerical-analytical method based on infinite integral, infinite Bessel series, and trigonometric functions is proposed in [19] to calculate the mutual inductance between two rectangular coils, which must be resolved numerically [20].…”

Section: Introductionmentioning

confidence: 99%

Analytical Modeling of Self- and Mutual Inductances of DD Coils in Wireless Power Transfer Applications

Alkasir

Abdollahi

et al. 2022

J Electromagn Eng Sci

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Self- and mutual inductances are major design parameters for wireless power transfer (WPT) systems. To optimize a WPT system and estimate its performance in terms of received power and efficiency, it is essential to obtain a simple, fast, and accurate calculation of these two parameters. The polarized double-D (DD) coils were selected due to their simplicity of structure, high efficiency, and low sensitivity to misalignment conditions. This paper presents analytical calculations of self- and mutual inductance using the Biot-Savart law for DD coils. The results of the analytical calculations of mutual inductance in different distances between coils were investigated, and the results of the calculations were verified using experimental and finite element method (FEM) simulation results. This paper also presents analytical and FEM-based optimization guidelines for the coupling coefficient of the transmitter coil.

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Analytical model of mutual coupling between rectangular spiral coils with lateral misalignment for wireless power applications

Cited by 30 publications

References 18 publications

Monte-Carlo Analysis of the Influence of the Electrical Component Tolerances on the Behavior of Series-Series- and LCC-Compensated IPT Systems

Monte-Carlo Analysis of the Influence of the Electrical Component Tolerances on the Behavior of Series-Series- and LCC-Compensated IPT Systems

Impact of Coil Misalignment in Data Transmission over the Inductive Link of an EV Wireless Charger

Analytical Modeling of Self- and Mutual Inductances of DD Coils in Wireless Power Transfer Applications

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