Improvement of wireless power transmission efficiency of implantable subcutaneous devices by closed magnetic circuit mechanism

Sung Eun Jo, Sanghoon Joung, Jun Kyo Francis Suh, Yong-Jun Kim

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Induction coils were fabricated based on flexible printed circuit board for inductive transcutaneous power transmission. The coil had closed magnetic circuit (CMC) structure consisting of inner and outer magnetic core. The power transmission efficiency of the fabricated device was measured in the air and in vivo condition. It was confirmed that the CMC coil had higher transmission efficiency than typical air-core coil. The power transmission efficiency during a misalignment between primary coil and implanted secondary coil was also evaluated. The decrease of mutual inductance between the two coils caused by the misalignment led to a low efficiency of the inductive link. Therefore, it is important to properly align the primary coil and implanted secondary coil for effective power transmission. To align the coils, a feedback coil was proposed. This was integrated on the backside of the primary coil and enabled the detection of a misalignment of the primary and secondary coils. As a result of using the feedback coil, the primary and secondary coils could be aligned without knowledge of the position of the implanted secondary coil.

Original languageEnglish
Pages (from-to)973-980
Number of pages8
JournalMedical and Biological Engineering and Computing
Volume50
Issue number9
DOIs
Publication statusPublished - 2012 Sep 1

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Magnetic circuits
Power transmission
Feedback
Magnetic cores
Air
Printed circuit boards
Inductance

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering
  • Computer Science Applications

Cite this

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abstract = "Induction coils were fabricated based on flexible printed circuit board for inductive transcutaneous power transmission. The coil had closed magnetic circuit (CMC) structure consisting of inner and outer magnetic core. The power transmission efficiency of the fabricated device was measured in the air and in vivo condition. It was confirmed that the CMC coil had higher transmission efficiency than typical air-core coil. The power transmission efficiency during a misalignment between primary coil and implanted secondary coil was also evaluated. The decrease of mutual inductance between the two coils caused by the misalignment led to a low efficiency of the inductive link. Therefore, it is important to properly align the primary coil and implanted secondary coil for effective power transmission. To align the coils, a feedback coil was proposed. This was integrated on the backside of the primary coil and enabled the detection of a misalignment of the primary and secondary coils. As a result of using the feedback coil, the primary and secondary coils could be aligned without knowledge of the position of the implanted secondary coil.",
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Improvement of wireless power transmission efficiency of implantable subcutaneous devices by closed magnetic circuit mechanism. / Jo, Sung Eun; Joung, Sanghoon; Suh, Jun Kyo Francis; Kim, Yong-Jun.

In: Medical and Biological Engineering and Computing, Vol. 50, No. 9, 01.09.2012, p. 973-980.

Research output: Contribution to journalArticle

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