A Wireless Power Conversion Chain With Fully On-Chip Automatic Resonance Tuning System for Biomedical Implants
This paper presents a wireless power conversion system designed for biomedical implants, with integrated automatic resonance tuning. The automatic tuning mechanism improves power transfer efficiency (PTE) by finely tuning the resonant frequency of the power link and maximizing the rectified voltage....
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| Format: | Article |
| Language: | English |
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IEEE
2024-01-01
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| Series: | IEEE Open Journal of Circuits and Systems |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10481676/ |
| _version_ | 1797201303017881600 |
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| author | Mohammad Javad Karimi Menghe Jin Catherine Dehollain Alexandre Schmid |
| author_facet | Mohammad Javad Karimi Menghe Jin Catherine Dehollain Alexandre Schmid |
| author_sort | Mohammad Javad Karimi |
| collection | DOAJ |
| description | This paper presents a wireless power conversion system designed for biomedical implants, with integrated automatic resonance tuning. The automatic tuning mechanism improves power transfer efficiency (PTE) by finely tuning the resonant frequency of the power link and maximizing the rectified voltage. This adjustment ensures robust and reliable remote powering, even in the face of environmental changes and process variations, while also minimizing tissue exposure to power. On-chip switched array capacitors are connected in parallel with the resonant capacitor, and the system identifies the optimal switched capacitor combination for the highest rectified voltage by iterating over each of them. The proposed system is implemented and fabricated in standard 180nm CMOS technology, with a total area of 0.339 mm2, and its operation is verified. The measurement results demonstrate that this system provides tolerance up to mismatches equivalent to 75 pF capacitance variation in LC tank, ±15% LC variation in this design. The system offers a PTE enhancement from 9.1% to 30.2% in case of high LC variation, and the tuning control consumes 154.7<inline-formula> <tex-math notation="LaTeX">$\mu \text{W}$ </tex-math></inline-formula> of power during resonance tuning. Moreover, the power conversion chain delivers an optimized rectified voltage along with a regulated voltage of 1.8 V. |
| first_indexed | 2024-04-24T07:45:24Z |
| format | Article |
| id | doaj.art-1c9ade0c7d09438eb82391db79fa3709 |
| institution | Directory Open Access Journal |
| issn | 2644-1225 |
| language | English |
| last_indexed | 2024-04-24T07:45:24Z |
| publishDate | 2024-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of Circuits and Systems |
| spelling | doaj.art-1c9ade0c7d09438eb82391db79fa37092024-04-18T23:00:58ZengIEEEIEEE Open Journal of Circuits and Systems2644-12252024-01-01511712710.1109/OJCAS.2024.338235510481676A Wireless Power Conversion Chain With Fully On-Chip Automatic Resonance Tuning System for Biomedical ImplantsMohammad Javad Karimi0https://orcid.org/0000-0003-1450-8844Menghe Jin1https://orcid.org/0009-0002-3668-761XCatherine Dehollain2https://orcid.org/0000-0002-6262-2644Alexandre Schmid3https://orcid.org/0000-0002-6730-0193Institute of Electrical and Micro Engineering, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, SwitzerlandInstitute of Electrical and Micro Engineering, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, SwitzerlandInstitute of Electrical and Micro Engineering, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, SwitzerlandInstitute of Electrical and Micro Engineering, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, SwitzerlandThis paper presents a wireless power conversion system designed for biomedical implants, with integrated automatic resonance tuning. The automatic tuning mechanism improves power transfer efficiency (PTE) by finely tuning the resonant frequency of the power link and maximizing the rectified voltage. This adjustment ensures robust and reliable remote powering, even in the face of environmental changes and process variations, while also minimizing tissue exposure to power. On-chip switched array capacitors are connected in parallel with the resonant capacitor, and the system identifies the optimal switched capacitor combination for the highest rectified voltage by iterating over each of them. The proposed system is implemented and fabricated in standard 180nm CMOS technology, with a total area of 0.339 mm2, and its operation is verified. The measurement results demonstrate that this system provides tolerance up to mismatches equivalent to 75 pF capacitance variation in LC tank, ±15% LC variation in this design. The system offers a PTE enhancement from 9.1% to 30.2% in case of high LC variation, and the tuning control consumes 154.7<inline-formula> <tex-math notation="LaTeX">$\mu \text{W}$ </tex-math></inline-formula> of power during resonance tuning. Moreover, the power conversion chain delivers an optimized rectified voltage along with a regulated voltage of 1.8 V.https://ieeexplore.ieee.org/document/10481676/inductive linkpower conversion chainrectifierwireless power transmission (WPT) |
| spellingShingle | Mohammad Javad Karimi Menghe Jin Catherine Dehollain Alexandre Schmid A Wireless Power Conversion Chain With Fully On-Chip Automatic Resonance Tuning System for Biomedical Implants IEEE Open Journal of Circuits and Systems inductive link power conversion chain rectifier wireless power transmission (WPT) |
| title | A Wireless Power Conversion Chain With Fully On-Chip Automatic Resonance Tuning System for Biomedical Implants |
| title_full | A Wireless Power Conversion Chain With Fully On-Chip Automatic Resonance Tuning System for Biomedical Implants |
| title_fullStr | A Wireless Power Conversion Chain With Fully On-Chip Automatic Resonance Tuning System for Biomedical Implants |
| title_full_unstemmed | A Wireless Power Conversion Chain With Fully On-Chip Automatic Resonance Tuning System for Biomedical Implants |
| title_short | A Wireless Power Conversion Chain With Fully On-Chip Automatic Resonance Tuning System for Biomedical Implants |
| title_sort | wireless power conversion chain with fully on chip automatic resonance tuning system for biomedical implants |
| topic | inductive link power conversion chain rectifier wireless power transmission (WPT) |
| url | https://ieeexplore.ieee.org/document/10481676/ |
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