A 92%-Efficiency Inductor-Charging Switched-Capacitor Stimulation System with Level-Adaptive Duty Modulation and Offset Charge Balancing for Muscular Stimulation

Kyeongho Eom, Han Sol Lee, Minju Park, Hyung Min Lee, Seung Min Yang, Jong Chan Choe, Suk Won Hwang, Young Woo Suh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Implantable medical devices (IMD) with stimulation system-on-chip (SoC) have been essential techniques for disease treatments and rehabilitations. As neuromuscular stimulation injects a large amount of stimulus energy into the body, its energy efficiency and safety should be carefully considered, which otherwise damages cellular tissues. Conventional current stimulation suffers from large power losses across current sources. Even adopting the adaptive supply voltage, the stimulator efficiency is still limited below 60% [1]. The switched capacitor stimulation (SCS) system charges the capacitor and transfer its charges to the tissue, achieving stimulator efficiency up to 84% [2]-[4]. However, previous SCS systems only operate with AC input voltages directly from wireless power, which can be interrupted in loosely-coupled inductive links. To take advantages of using a rechargeable battery or a supercapacitor for reliable IMD operation, the SCS system that can efficiently operate with both DC and AC inputs is required. Also, more aggressive techniques to further improve stimulator efficiency and efficacy are highly needed.

Original languageEnglish
Title of host publication2022 IEEE Custom Integrated Circuits Conference, CICC 2022 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665407564
DOIs
Publication statusPublished - 2022
Event43rd Annual IEEE Custom Integrated Circuits Conference, CICC 2022 - Newport Beach, United States
Duration: 2022 Apr 242022 Apr 27

Publication series

NameProceedings of the Custom Integrated Circuits Conference
Volume2022-April
ISSN (Print)0886-5930

Conference

Conference43rd Annual IEEE Custom Integrated Circuits Conference, CICC 2022
Country/TerritoryUnited States
CityNewport Beach
Period22/4/2422/4/27

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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