Optimum Transmitter Current Distribution for Dynamic Wireless Power Transfer With Segmented Array

The misalignment problem is a major challenge in dynamic wireless power transfer systems with a segmented transmitter (Tx) array. Tx coils farther away from receiver (Rx) experience higher currents as compared to Tx coils nearer to Rx coil leading to higher losses and lower performances. This paper...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2018-01, Vol.66 (1), p.346-356
Main Authors: Jayathurathnage, Prasad Kumara Sampath, Alphones, A., Vilathgamuwa, D. Mahinda, Ong, Andrew
Format: Article
Language:English
Subjects:
Amplitude modulation
Coiling
Coils
Current distribution
Current modulation
Design optimization
dynamic wireless power transfer (D-WPT)
Electric power distribution
Load resistance
Misalignment
optimum current distribution
Power efficiency
Power generation
segmented transmitter (Tx) coil array
Spherical coordinates
Transmitters
Vehicle dynamics
Wireless power transmission
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Summary:The misalignment problem is a major challenge in dynamic wireless power transfer systems with a segmented transmitter (Tx) array. Tx coils farther away from receiver (Rx) experience higher currents as compared to Tx coils nearer to Rx coil leading to higher losses and lower performances. This paper reports theoretical optimum current distribution among Tx coils for any Rx position. A current amplitude modulation scheme is analyzed with the analogy of N-Cartesian coordinate equivalent of spherical coordinates. Efficiency and transferred power are evaluated for the proposed current distribution, and further optimization is performed with respect to load resistance, operating frequency, and the number of simultaneously powered Tx coils. The maximum performances that can be obtained with the optimized design conditions have been derived as well. The analysis is validated using numerical and experimental results.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2017.2698460