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A Time-Interleaved Resonant Voltage Mode Wireless Power Receiver With Delay-Based Tracking Loops for Implantable Medical Devices

Authors
Shin, Se-UnChoi, MinseongJung, SeungchulLee, Hyung-MinCho, Gyu-Hyeong
Issue Date
5월-2020
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
Delay-based control; implantable medical device (IMD); inductive link; peak time detector; power management; time-interleaved scheme; wireless power transfer (WPT)
Citation
IEEE JOURNAL OF SOLID-STATE CIRCUITS, v.55, no.5, pp.1374 - 1385
Indexed
SCIE
SCOPUS
Journal Title
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume
55
Number
5
Start Page
1374
End Page
1385
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/56064
DOI
10.1109/JSSC.2019.2947237
ISSN
0018-9200
Abstract
This article proposes a resonant voltage mode receiver (RVM-Rx) as a new topology of a wireless power receiver for battery charging. With a resonant capacitor interleaving scheme, an LC tank in the receiver can always be configured and isolated from the output, leading to optimal power transfer regardless of the operation phase. Thus, the power transfer efficiency is not sensitive to load conditions, such as battery voltage variation. In the RVM-Rx, a diode-based voltage peak time detection (VPTD) technique enables the system operation at a high resonant frequency. Also, a delay-based control scheme with a minimum diode time tracking loop (MDTL) and an optimum duty tracking loop (ODTL) leads to efficient power conversion by adaptively adjusting the operation state. The RVM-Rx prototype in a 0.18-mu m CMOS process can operate at a high resonant frequency of 13.56 MHz with a small RX coil (7 mm x 7 mm), while achieving a maximum receiver power efficiency of 67.8% for battery charging.
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공과대학 (전기전자공학부)
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