Model-Based Optimization of Spiral Coils for Improving Wireless Power Transfer
Yosra Ben Fadhel,
Ghada Bouattour,
Dhouha Bouchaala
et al.
Abstract:Inductive wireless power transfer is a promising technology for powering smart wearable devices. The spiral coil shape is widely used in wireless power transfer applications. Nevertheless, during the coil design process, there are many challenges to overcome considering all the design constraints. The most important is to determine the optimal coil parameters (internal radius, external radius, spacing, wire width, and conductive wire) with the aim of obtaining the highest coil quality factor. Coil modeling is … Show more
“…The power transfer can be obtained by inductive coupling, capacitive coupling, or microwave radiation [1][2][3][4][5]. Low-power charging is widely used in mobile and wearable devices, smart home appliances, smart textiles, and medical implants [6][7][8][9][10][11]. A different set of challenges emerges in high-power wireless charging applications, such as electric cargo and passenger vehicles, ships, airborne vehicles, unmanned vehicles (drones) and space vessels [12][13][14][15][16][17].…”
The design of a wireless power transfer system with double rectangular coils for 11 kW power transfer is considered. System modeling and numerical calculation of the system parameters are described. Coils are made from available Litz wire, which has a smaller than necessary diameter for the required power. Thus, a setup with double layer coils was developed, which resulted in a modified design. Starting from a system consisting of coupled coils, as suggested by the standard for wireless power transfer Level 3 in class Z1, different coil and ferrite shield layouts were tested in numerical simulations, and their parameters were calculated. The prototype was constructed based on the simulated model with the best results and properties. Numerical results were verified by laboratory measurements, and a successful power transfer at 11 kW was achieved.
“…The power transfer can be obtained by inductive coupling, capacitive coupling, or microwave radiation [1][2][3][4][5]. Low-power charging is widely used in mobile and wearable devices, smart home appliances, smart textiles, and medical implants [6][7][8][9][10][11]. A different set of challenges emerges in high-power wireless charging applications, such as electric cargo and passenger vehicles, ships, airborne vehicles, unmanned vehicles (drones) and space vessels [12][13][14][15][16][17].…”
The design of a wireless power transfer system with double rectangular coils for 11 kW power transfer is considered. System modeling and numerical calculation of the system parameters are described. Coils are made from available Litz wire, which has a smaller than necessary diameter for the required power. Thus, a setup with double layer coils was developed, which resulted in a modified design. Starting from a system consisting of coupled coils, as suggested by the standard for wireless power transfer Level 3 in class Z1, different coil and ferrite shield layouts were tested in numerical simulations, and their parameters were calculated. The prototype was constructed based on the simulated model with the best results and properties. Numerical results were verified by laboratory measurements, and a successful power transfer at 11 kW was achieved.
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