Figure of Merit for the Optimization of Wireless Power Transfer System Against Misalignment Tolerance

Sampath, J.P.K.; Alphones, Arokiaswami; Vilathgamuwa, D.M.

doi:10.1109/tpel.2016.2601939

Cited by 44 publications

(20 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This variation impacts the performances of the power transfer and the communication system. Concerning the effects on the power transfer, [14] demonstrated that the compensation networks have a relevant influence on the capability to cope with coil misalignments. However, extension of this previous analysis is required to determine the consequences for communication performance.…”

Section: Theoretical Analysis Of the Coil Misalignment Effects On Thementioning

confidence: 99%

“…This is due to the promotion of the use of wireless charge while the vehicle is moving (dynamic charge) or temporally stopped due to traffic signals (stationary charge) [13]. The effect of coil misalignment has already been studied in regard to power transfer, but the analysis regarding its impact on the communication channel is still missing [14].This paper analyses the capacity of the wireless channel created between the two power coils. In particular, it is based on the scheme proposed in [10] where both data and power signals are transmitted at the same frequency in order to avoid filters, high-frequency communication modules and extra coils to couple the data to the power circuits.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

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

2018

View full text Add to dashboard Cite

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 ...

show abstract

Section: Theoretical Analysis Of the Coil Misalignment Effects On Thementioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

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

2018

View full text Add to dashboard Cite

show abstract

“…In [4], the solution for the Tx voltages was presented assuming a fixed Rx load. In [5], a plurality of repeaters was attached to the Tx and Rx to solve the misalignment problem. In [6], the three Tx sources with phase differences were used to stably transfer power to an Rx.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Excitation Magnitudes and Phases for Maximum Efficiencies in a MISO Wireless Power Transfer System

Lee

Boo

Kim

et al. 2020

J Electromagn Eng Sci

View full text Add to dashboard Cite

This paper presents a method for solving receiver misalignment (axial or angular) problems in wireless power transfer systems using a multiple-input single-output system. The optimum magnitudes and phases of the transmitter voltages and receiver load for maximum efficiency are derived in convenient analytical forms when negligible mutual couplings between transmitters. These solutions are validated by genetic algorithm optimization and electromagnetic-simulation results for a design ex-ample of two transmitters and one rotating receiver.

show abstract

“…For a biomedical device implanted in a human body, the device may rotate with respect to the power transmitting element. Some methods and optimization techniques are reported to maintain the performance of the WPT system even in an angular misalignment [21][22][23]. However, there are few studies of quantitative analysis reported on the electromagnetic coupling under angular misalignment.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Electric Coupling Analysis for Angular Misalignment of Spiral Resonators in WPT Systems

Zhang¹,

Yoshikawa²

2018

PIER M

View full text Add to dashboard Cite

Angular misalignment is an issue for many potential applications of wireless power transfer (WPT). It is necessary to keep coupling coefficient, especially the magnetic coupling to be insensitive to angular misalignment. This paper analyzes the coupling between the spiral resonators when one resonator rotates with respect to the other. The quantitative data of magnetic and electric coupling components as well as the total coupling coefficient in angular misalignments are presented. Furthermore, a 3D spiral resonator which is less sensitive to angular misalignment is proposed. The coupling when the 3D spiral rotates is studied and the results of analysis and experiment both show that the proposed 3D spiral resonator can keep coupling coefficient at a certain level under angular misalignment.

show abstract

Figure of Merit for the Optimization of Wireless Power Transfer System Against Misalignment Tolerance

Cited by 44 publications

References 30 publications

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

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

Optimization of Excitation Magnitudes and Phases for Maximum Efficiencies in a MISO Wireless Power Transfer System

Magnetic and Electric Coupling Analysis for Angular Misalignment of Spiral Resonators in WPT Systems

Contact Info

Product

Resources

About