Abstract
Over the last decade, people paid a lot of attention to wireless magnetic resonant energy transfer system. It has become one of best method to supply power for implantable electronic devices. In this paper, a 3D wearable litz double coils (3D-WLDC) with two identical integrated flexible coils is proposed and the corresponding theoretical model for inductance, AC resistance, and quality factor is built up. Based on the theoretical model, 3D-WLDC with different numbers of strands and turns are designed to study the effects of geometric parameters on the coil performance. Several 3D-WLDCs with different numbers of strands and turns are wound and measured by impedance analyzer to validate the proposed theoretical model. The measured results of the 3D-WLDC are in agreement with the theoretical model. Two similar 3D-WLDCs, each with 6 mm diameter, are wound around an implantable capsule and applied to set up the wireless energy transfer system, which can greatly save the volume of implantable electronic devices. The no-load power transfer efficiency is 33.77 % at the working frequency of 13.56 MHz, when the transmission distance is 5 mm. A power of 21.82 mW is received when the load resistance is 100 Ω.
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Acknowledgments
This work was supported by National Natural Science Foundation of China (60706031 and 61574015), Beijing National Science Foundation (4122058), Beijing Higher Education Young Elite Teacher Project (YETP0536), the Fundamental Research Funds for the Central Universities (2014JBM009), the State Key Laboratory of Rail Traffic Control and Safety (RCS2016K009) Beijing Jiaotong University and the “Talents Project” of Beijing Jiaotong University.
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Chen, B., Li, X., Li, B. et al. Wireless energy transfer system based on 3D wearable litz double coils. Microsyst Technol 23, 959–966 (2017). https://doi.org/10.1007/s00542-016-2900-9
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DOI: https://doi.org/10.1007/s00542-016-2900-9