An ultra-compact and efficient Li-ion battery charger circuit for biomedical applications
This paper describes an ultra-compact analog lithium-ion (Li-ion) battery charger for wirelessly powered implantable medical devices. The charger presented here takes advantage of the tanh output current profile of an operational transconductance amplifier (OTA) to smoothly transition between consta...
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| Format: | Article |
| Language: | en_US |
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Institute of Electrical and Electronics Engineers (IEEE)
2012
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| Online Access: | http://hdl.handle.net/1721.1/72541 https://orcid.org/0000-0002-1876-3714 https://orcid.org/0000-0003-0384-3786 https://orcid.org/0000-0002-8645-1026 |
| _version_ | 1811088490661675008 |
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| author | Do Valle, Bruno Guimaraes Wentz, Christian T. Sarpeshkar, Rahul |
| author2 | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science |
| author_facet | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Do Valle, Bruno Guimaraes Wentz, Christian T. Sarpeshkar, Rahul |
| author_sort | Do Valle, Bruno Guimaraes |
| collection | MIT |
| description | This paper describes an ultra-compact analog lithium-ion (Li-ion) battery charger for wirelessly powered implantable medical devices. The charger presented here takes advantage of the tanh output current profile of an operational transconductance amplifier (OTA) to smoothly transition between constant current (CC) and constant voltage (CV) charging regimes without the need for additional area- and power-consuming control circuitry. The proposed design eliminates the need for sense resistors in either the charging path or control loop by utilizing a current comparator to detect end-of-charge. The power management chip was fabricated in an AMI 0.5 μm CMOS process, consuming 0.15 mm[superscript 2] of area. This figure represents an order of magnitude reduction in area from previous designs. An initial proof-of-concept design achieved 75% power efficiency and charging voltage accuracy of 99.8% relative to the target 4.2 V. |
| first_indexed | 2024-09-23T14:02:59Z |
| format | Article |
| id | mit-1721.1/72541 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:02:59Z |
| publishDate | 2012 |
| publisher | Institute of Electrical and Electronics Engineers (IEEE) |
| record_format | dspace |
| spelling | mit-1721.1/725412022-10-01T18:50:18Z An ultra-compact and efficient Li-ion battery charger circuit for biomedical applications Do Valle, Bruno Guimaraes Wentz, Christian T. Sarpeshkar, Rahul Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Sarpeshkar, Rahul Do Valle, Bruno Guimaraes Wentz, Christian T. Sarpeshkar, Rahul This paper describes an ultra-compact analog lithium-ion (Li-ion) battery charger for wirelessly powered implantable medical devices. The charger presented here takes advantage of the tanh output current profile of an operational transconductance amplifier (OTA) to smoothly transition between constant current (CC) and constant voltage (CV) charging regimes without the need for additional area- and power-consuming control circuitry. The proposed design eliminates the need for sense resistors in either the charging path or control loop by utilizing a current comparator to detect end-of-charge. The power management chip was fabricated in an AMI 0.5 μm CMOS process, consuming 0.15 mm[superscript 2] of area. This figure represents an order of magnitude reduction in area from previous designs. An initial proof-of-concept design achieved 75% power efficiency and charging voltage accuracy of 99.8% relative to the target 4.2 V. National Institutes of Health (U.S.) (Grant number NS-056140) United States. Office of Naval Research. (Grant number N00014-09-1-1015) 2012-09-06T15:08:00Z 2012-09-06T15:08:00Z 2010-08 2010-05 Article http://purl.org/eprint/type/ConferencePaper 978-1-4244-5309-2 978-1-4244-5308-5 http://hdl.handle.net/1721.1/72541 Valle, Bruno Do, Christian T. Wentz, and Rahul Sarpeshkar. “An Ultra-compact and Efficient Li-ion Battery Charger Circuit for Biomedical Applications.” Proceedings of 2010 IEEE International Symposium on Circuits and Systems (ISCAS). 1224–1227. © Copyright 2010 IEEE https://orcid.org/0000-0002-1876-3714 https://orcid.org/0000-0003-0384-3786 https://orcid.org/0000-0002-8645-1026 en_US http://dx.doi.org/10.1109/ISCAS.2010.5537287 Proceedings of 2010 IEEE International Symposium on Circuits and Systems (ISCAS) Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Institute of Electrical and Electronics Engineers (IEEE) IEEE |
| spellingShingle | Do Valle, Bruno Guimaraes Wentz, Christian T. Sarpeshkar, Rahul An ultra-compact and efficient Li-ion battery charger circuit for biomedical applications |
| title | An ultra-compact and efficient Li-ion battery charger circuit for biomedical applications |
| title_full | An ultra-compact and efficient Li-ion battery charger circuit for biomedical applications |
| title_fullStr | An ultra-compact and efficient Li-ion battery charger circuit for biomedical applications |
| title_full_unstemmed | An ultra-compact and efficient Li-ion battery charger circuit for biomedical applications |
| title_short | An ultra-compact and efficient Li-ion battery charger circuit for biomedical applications |
| title_sort | ultra compact and efficient li ion battery charger circuit for biomedical applications |
| url | http://hdl.handle.net/1721.1/72541 https://orcid.org/0000-0002-1876-3714 https://orcid.org/0000-0003-0384-3786 https://orcid.org/0000-0002-8645-1026 |
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