A Resonant Current-Mode Wireless Power Receiver and Battery Charger With-32 dBm Sensitivity for Implantable Systems
- Authors
- Choi, M (Choi, Myungjoon); Jang, T (Jang, Taekwang); Jeong, J (Jeong, Junwon); Jeong, S (Jeong, Seokhyeon); Blaauw, D (Blaauw, David); Sylvester, D (Sylvester, Denni
- Issue Date
- Dec-2016
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Citation
- IEEE JOURNAL OF SOLID-STATE CIRCUITS, v.51, no.12, pp 2880 - 2892
- Pages
- 13
- Journal Title
- IEEE JOURNAL OF SOLID-STATE CIRCUITS
- Volume
- 51
- Number
- 12
- Start Page
- 2880
- End Page
- 2892
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159324
- DOI
- 10.1109/JSSC.2016.2598224
- ISSN
- 0018-9200
1558-173X
- Abstract
- Wireless power transfer for implantable systems must harvest very low power levels due to low incident power on human tissues and a small receiver coil size. This work proposes resonant current-mode charging to reduce minimum harvestable input power and increase power efficiency at low input power levels. Avoiding rectification and voltage regulation from conventional voltage-mode methods, this work resonates an LC tank for multiple cycles to build up energy, then directly charges a battery with inductor current. A prototype is fabricated in 0.18 mu m CMOS technology. Minimum harvestable input power is 600 nW and maximum power efficiency is 67.6% at 4.2 mu W input power. Power transmission through bovine tissue is measured to have negligible efficiency loss, making this technique amenable to implantable applications.
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