Analytical characterisation of magnetic field generated by ICPT wireless charger

Triviño-Cabrera, Alicia; Aguado, José A.; González, Juan Mon

doi:10.1049/el.2017.0968

Cited by 19 publications

(16 citation statements)

References 7 publications

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“…An equivalent circuit, as shown in Figure 2, can be used to determine the correct capacitors. In order to have reasonably-sized coils, the magnetic field involved in this process is in the frequency range of 20-100 kHz [4]. This implies that the current injected to the primary coil must be in the aforementioned frequency range.…”

Section: Overview Of a Wireless Ev Chargermentioning

confidence: 99%

“…To enhance the power transfer, reactive components (typically named compensation networks) are added to both coils. Power converters are also inserted in the chargers to ensure a high-frequency magnetic field [4].…”

Section: Introductionmentioning

confidence: 99%

“…The reflected impedance is not neglected when deriving the electrical magnitudes affecting the computation of the channel capacity. (4). The vertical, horizontal and joint vertical and horizontal types of misalignments are analysed.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Overview Of a Wireless Ev Chargermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2018

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“…The widespread interest in solving this problem responds to the need for strengthening or nullifying the magnetic coupling between any pair of coils that constitute the considered coil system, depending on the application. For instance, enhancement of magnetic coupling between a transmitting coil and a receiving coil is required in wireless power transfer systems, every time that the transmission efficiency of the inductive link must be optimized [1][2][3]30]. On the other hand, reduction of magnetic coupling effects is desired in applications like magnetic resonance imaging (MRI), where multiple receiving coils are located in close proximity to each other to assure compact coverage of an area and obtain high signal-to-noise ratio images [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Yet, these solutions either consists of integral expressions that require intensive and time-demanding numerical evaluation [4,5,26], or are valid in the quasi-static frequency range only [7,35,36] and cannot be used when the effects of the displacement currents are not negligible. This may be the case, for instance, of applications where the operating frequency exceeds a few tens of MHz, like magnetic resonance imaging [1,2] and shortwave inductive diathermy for therapeutic heating of tissues [30,[32][33][34]37]. Here, the overall size of the whole two-coil system may not be sufficiently small for electromagnetic retardation to have negligible impact on the field distribution, and the quasi-static field assumption fails.…”

Section: Introductionmentioning

confidence: 99%

On the Mutual Inductance Between Non-Coaxial Coplanar Circular Loops

Salis¹,

Muzi²

2019

PIER Letters

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A simple and efficient explicit solution is derived for the mutual inductance of two noncoaxial coplanar circular loops, which is valid in the quasi-static as well as non-quasi-static frequency ranges. The solution is obtained by rigorously evaluating the Sommerfeld Integral describing the inductance, starting from expanding the integrand into a power series of the loop radius. As a result, a sum of simpler integrals is obtained, and term-by-term analytical integration is straightforwardly performed. The inductance is finally expressed as a series of spherical Hankel functions, with algebraic coefficients depending on the electrical size of the loops. Conducted numerical tests lead to conclude that, accuracy being equal, the proposed expression offers advantages in terms of time cost over conventional numerical integration techniques.

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