scholarly journals COMPARATIVE STUDY OF CIRCULAR FLAT SPIRAL COILS STRUCTURE EFFECT ON MAGNETIC RESONANCE WIRELESS POWER TRANSFER PERFORMANCE

2020 ◽  
Vol 94 ◽  
pp. 119-129
Author(s):  
Naamane Mohdeb
Keyword(s):  
Magnetic Resonance ◽  
Comparative Study ◽  
Wireless Power Transfer ◽  
Structure Effect ◽  
Transfer Performance ◽  
Power Transfer ◽  
Wireless Power ◽  
Spiral Coils ◽  
Flat Spiral

Optimization of Resonant Inductive Wireless Power Transfer Using Multilayer Flat Spiral Coils

2015 ◽  
Vol 52 (2) ◽  
pp. 560-568 ◽  
Author(s):  
Dustin J. Alinger ◽  
Allison K. Porter ◽  
Raymond J. Sedwick
Keyword(s):  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Spiral Coils ◽  
Flat Spiral

scholarly journals Optimization and Analysis of Multilayer Planar Spiral Coils for the Application of Magnetic Resonance Wireless Power Transfer to Wearable Devices

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5113
Author(s):  
Young-Jin Park ◽  
Ji-Eun Kim ◽  
Kyung-Min Na ◽  
Ki-Dong Yang ◽  
Kyung-Hwan Cho
Keyword(s):  
Magnetic Resonance ◽  
Coupling Efficiency ◽  
Wireless Power Transfer ◽  
Monitoring Device ◽  
Q Factor ◽  
Power Transfer ◽  
Wireless Power ◽  
Wine Glass ◽  
Signal Monitoring ◽  
Spiral Coils

In this study, small multilayer planar spiral coils were analyzed and optimized to wirelessly charge an in-ear wearable bio-signal monitoring device in a wine-glass-shaped transmitter (Tx) based on magnetic resonance wireless power transfer (MR-WPT). For analysis of these coils, a volume filament model (VFM) was used, and an equivalent circuit formulation for the VFM was proposed. The proposed method was applied to design effective multilayer coils with a diameter and height of 6 and 3.8 mm, respectively, in the wearable device. For the coils, a printed circuit board having a 0.6 mm thick dielectric substrate and a 2 oz thick copper metal was used. Moreover, the coils on each layer were connected in series. The dimensions of the double-, four-, and eight-layer coils were optimized for the maximum quality factor (Q-factor) and coupling efficiency. The operating frequency was 6.78 MHz. The optimal dimensions for the maximum Q-factor varied depending on the number of coil layers, pattern width, and turn number. For verification, the designed coils were fabricated and measured. For the four-layer coil, the coupling efficiency and Q-factor using the measured resistance and mutual inductance were 58.1% and 32.19, respectively. Calculations showed that the maximum Q-factor for the four-layer coil was 40.8 and the maximum coupling efficiency was 60.1%. The calculations and measurement were in good agreement. Finally, the entire system of the in-ear wearable bio-signal monitoring device, comprising a wine-glass-shaped transmitter, the designed receiving coil, and a monitoring circuit, was fabricated. The measured dc-dc efficiency of the MR-WPT system was 16.08%.

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