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KMID : 1144120220120030229
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Biomedical Engineering Letters
2022 Volume.12 No. 3 p.229 ~ p.238
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A resonant current-mode wireless power transfer for implantable medical devices: an overview
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Kim Jong-Hun
ul Hassan Najam
Lee Seung-Ju
Jung Yeon-Woo
Shin Se-Un
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Abstract
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Implantable Medical Devices (IMDs) have been developing in ways to be lighter and lower-power systems. In the view of such developments, the battery recharging capacity to ensure the stable operation of the system is essential. Wireless power transfer (WPT) was proposed as a solution to recharge the battery without complex metallic contacts. However, due to limitations such as threshold voltage of power switches and minimal input power of the multi-stage structure (Rectifier?+?Regulator/DC-DC converter) of conventional voltage-mode (VM) WPT, there are drawbacks of an input power range above a certain threshold level and limitations due to strict regulations on the human body. These issues make the design of the IMD battery charger much harder and prevent IMDs from being a more viable option for people-in-need. This paper introduces distinguishing characteristics of resonant current-mode (RCM) WPT technology to overcome the aforementioned issues. It also describes the basic theory, conventional circuits of VM/RCM, comparisons, and major challenges of RCM. Finally, advanced and efficiency-enhancing techniques of the-state-of-art works among the RCM topologies will be discussed to follow up the trend of RCM WPT.
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KEYWORD
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Implantable medical device (IMD), Battery charging, Resonant current-mode (RCM), Wireless power transfer (WPT)
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