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KMID : 1144120120020030179
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Biomedical Engineering Letters
2012 Volume.2 No. 3 p.179 ~ p.185
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Comparison of planar type coils for efficient power supply to implantable devices
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Kim So-Hee
Yoo Soon-Ki
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Abstract
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Purpose: Inductively coupled coils are widely used in wireless power supply to implanted medical devices. Planar coils fabricated on flexible substrates are advantageous over conventional wire-wound coils, in terms of its mechanical flexibility to fit surfaces conformally, low volume occupancy, and repeatable and reliable manufacturing. However, it suffers relatively lower quality factor and thus lower power transfer efficiency. To overcome these shortcomings, the quality factor of planar coils needs to be maximized.
Methods: One way to achieve this is to make planar coils in multiple layers. Double-layered planar coils connected either in series or in parallel were fabricated, and their electrical properties and performance in inductive power transfer were compared.
Results: When the secondary load was relatively small, the double-layered planar coil connected in parallel showed better performance in voltage and power reception. However, when the secondary load was relatively large, i.e. larger than the characteristic impedance of the receiver LC circuit, the double-layered coil connected in series achieved better power transmission.
Conclusions: Depending on the load of the secondary circuit, more efficienct power transmission can be achieved by connecting a double-layer planar coil either in parallel or in series.
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KEYWORD
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Wireless power transfer, Inductive coupling, Planar coil, Double-layered coil
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