Design of Wireless Power Supply Optimized Structure for Capsule Endoscopes
Abstract
Wireless power transmission is an important method for powering wireless capsule endoscopes, but its efficiency is low,especially when the devices move freely in random positions and orientations. To improve the stability and efficiency of theendoscope in vivo, this study designed an optimization method for planar spiral coils utilized in wireless power transfer forcapsule endoscopes. An optimized structure using six planar spiral coils was first proposed as the transmitting coil, and theefficiency of a series-parallel wireless power transmission model was analyzed. A theoretical model was then examined for themagnetic field vector distributions of the spiral-type transmitting coil by using an elliptic coordinate system. The relationshipbetween the position of the receiving coil and the coupling coefficient was determined when the position and attitude changed.Finally, the experimental device of the wireless power supply system of the endoscope was designed with a class-E amplifierand Liz coil. The simulation and experimental results showed that the proposed method can generate high intensity magneticfield uniform, which can improve the efficiency of the wireless power transmission in the case of axial deviation and angularmisalignment. The experimental results also indicated that the proposed scheme can meet the needs of the power supply ofwireless endoscopes.References
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[2] Jianbo Gao, Traveling magnetic field for homogeneous wireless power transmission, IEEE Transactions on Power Delivery, 22 (1) (2007) 507-514.
[3] Andrea Moglia, Arianna Menciassi, Marc Oliver Schurr, Wireless capsule endoscopy: from diagnostic devices to multipurpose robotic systems, Biomedical Microdevices, 9 (2) (2007) 235-243.
[4] André Kurs1, Aristeidis Karalis, Robert Moffatt, et al., Robert Moffatt Wireless power transfer via strongly coupled magnetic resonances, Science, 317 (5834) (2007) 83-86.
[5] Sanchali Deb, ShouJiang Tang, Thomas L. Abell, et al., An endoscopic wireless gastro stimulator (with video), Gastrointestin Endoscopy, 75 (2) (2012) 411-415.
[6] Kanber Mithat Silay, Catherine Dehollain, Michel Declercq, Closed-loop remote powering link for wireless cortical implants, IEEE Sensors Journal, 13 (9) (2013) 3226-3235.
[7] Kim, Sanghoek, Ho, John S., Chen, Lisa Y., et al., Wireless power transfer to a cardiac implant, Applied Physics Letters, 101 (7) (2012) 073701-073701-04.
[8] Anil Kumar RamRakhyani, Shahriar Mirabbasi, Mu Chiao, Design and optimization of resonance-based efficient wireless power delivery systems for biomedical implants, IEEE Transactions on Biomedical Circuits and Systems, 5 (1) (2011) 48-63.
[9] R. Puers, R. Carta, J. Thone, Wireless power and data transmission strategies for next-generation capsule endoscopes, Journal of Micromechanics and Microengineering, 21 (15) (2011) 1-15.
[10] Bert Lenaerts, Robert Puers, An inductive power link for a wireless endoscope, Biosensors and Bioelectronics, 22 (7) (2007) 1390-1395.
[11] Minh Quoc Nguyen, Peter Woods, Young-Sik Seo, et al., Position and angular misalignment analysis for a wirelessly powered stimulator, Proceedings of Microwave Symposium Digest, 2013 IEEE MTT-S International, Seattle, USA, (2013), Jun. 2–7.
[12] Wei Wu, Qiang Fang, Design and simulation of printed spiral coil used in wireless power transmission systems for implant medical devices, Proceedings of Engineering in Medicine and Biology Society, (8) (2011) 4018-4021.
[13] Minh Quoc Nguyen, Zachariah Hughes, Peter Woods, et al., field distribution models of spiral coil for misalignment analysis in wireless power transfer systems, IEEE Transactions on Microwave Theory and Techniques, 62 (4) (2014) 920-930.
[14] H. Li, G. Yan, P. Gao, A method for improving the wireless power transmission efficiency of an endoscopic capsule based on electromagnetic localization and synthesis of magnetic field vector, Proceedings of the Institution of Mechanical Engineers, Part C, Journal of Mechanical Engineering Science, 224 (7) (2010) 1463-1471.
[15] Wei Wang, Simon Hemour, Ke Wu, Coupled resonance energy transfer over gigahertz frequency range using ceramic filled cavity for medical implanted sensors, IEEE Transactions on Microwave Theory and Techniques, 62 (4) (2014) 956-964.
[16] Thuc Phi Duong, Jong-Wook Lee, Experimental results of high-efficiency resonant coupling wireless power transfer using a variable coupling method, IEEE Microwave and Wireless Components Letters, 21 (8) (2011) 442-444.
[17] Alanson P. Sample, David T. Meyer, Joshua R. Smith, Analysis, experimental results, and range adaptation of magnetically coupled resonators for wireless power transfer, IEEE Transactions on Industrial Electronics, 58 (2) (2011) 544-554.
[18] Huy Hoang, Seunggyu Lee, Youngsu Kim, et al., An adaptive technique to improve wireless power transfer for consumer electronics, IEEE Transactions on Consumer Electronics, 58 (2) (2012) 327-332.
Published
2016-07-07
How to Cite
CUI, Chang; ZHAO, Qiang; LI, Zhongjian.
Design of Wireless Power Supply Optimized Structure for Capsule Endoscopes.
Journal of Power Technologies, [S.l.], v. 96, n. 2, p. 101--109, july 2016.
ISSN 2083-4195.
Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/856>. Date accessed: 21 nov. 2024.
Issue
Section
Energy Engineering and Technology
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