An Analytical Model for Inductively Coupled Multichannel Implantable System With Micro-Coil Array

Mou, Zongxia; Zheng, Xiaolin; Hou, Wensheng; Wang, Xing; Wu, Xiaoying; Jiang, Yingtao

doi:10.1109/tmag.2012.2197401

Cited by 1 publication

(2 citation statements)

References 21 publications

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“…For the robust operation of the inductive link, various tuning techniques were also demonstrated [17][18][19]. As it is difficult to achieve a high Q for the coil on the miniature biomedical implant, some techniques to increase the inductance on the implant side were proposed [20][21][22][23]. Besides, techniques to optimize the design parameters of the planar printed spiral coils were demonstrated, achieving a PTE of 41.2% with a link operating frequency of 1 MHz [22].…”

Section: Pte-improvement Techniques For Inductively Coupled Wpt Systemsmentioning

confidence: 99%

“…Besides, techniques to optimize the design parameters of the planar printed spiral coils were demonstrated, achieving a PTE of 41.2% with a link operating frequency of 1 MHz [22]. In [20], a micro-coil array was implemented for a multi-channel wireless implantable system to achieve a high PTE. Similarly, a three-coil inductive link was proposed to achieve both high PTE and PDL [23].…”

Section: Pte-improvement Techniques For Inductively Coupled Wpt Systemsmentioning

confidence: 99%

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Duty-Cycled Wireless Power Transmission for Millimeter-Sized Biomedical Implants

Akram¹,

Yang²,

2020

Electronics

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Wireless power transmission (WPT) using an inductively coupled link is one of the most popular approaches to deliver power wirelessly to biomedical implants. As the electromagnetic wave travels through the tissue, it is attenuated and absorbed by the tissue, resulting in much weaker electromagnetic coupling than in the air. As a result, the received input power on the implant is very weak, and so is the input voltage at the rectifier, which is the first block that receives the power on the implant. With such a small voltage amplitude, the rectifier inevitably has a very poor power conversion efficiency (PCE), leading to a poor power transfer efficiency (PTE) of the overall WPT system. To address this challenge, we propose a new system-level WPT method based on duty cycling of the power transmission for millimeter-scale implants. In the proposed method, the power transmitter (TX) transmits the wave with a duty cycle. It transmits only during a short period of time and pauses for a while instead of transmitting the wave continuously. In doing so, the TX power during the active period can be increased while preserving the average TX power and the specific absorption rate (SAR). Then, the incoming voltage becomes significantly larger at the rectifier, so the rectifier can rectify the input with a higher PCE, leading to improved PTE. To investigate the design challenges and applicability of the proposed duty-cycled WPT method, a case for powering a 1 × 1-mm2-sized neural implant through the skull is constructed. The implant, a TX, and the associated environment are modeled in High-Frequency Structure Simulator (HFSS), and the circuit simulations are conducted in Cadence with circuit components in a 180-nm CMOS process. At a load resistor of 100 kΩ, an output capacitor of 4 nF, and a carrier frequency of 144 MHz, the rectifier’s DC output voltage and PCE are increased by 300% (from 1.5 V to 6 V) and by 50% (from 14% to 64%), respectively, when the duty cycle ratio of the proposed duty-cycled power transmission is varied from 100% to 5%.

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Section: Pte-improvement Techniques For Inductively Coupled Wpt Systemsmentioning

confidence: 99%

Section: Pte-improvement Techniques For Inductively Coupled Wpt Systemsmentioning

confidence: 99%

Duty-Cycled Wireless Power Transmission for Millimeter-Sized Biomedical Implants

Akram¹,

Yang²,

2020

Electronics

View full text Add to dashboard Cite

show abstract

An Analytical Model for Inductively Coupled Multichannel Implantable System With Micro-Coil Array

Cited by 1 publication

References 21 publications

Duty-Cycled Wireless Power Transmission for Millimeter-Sized Biomedical Implants

Duty-Cycled Wireless Power Transmission for Millimeter-Sized Biomedical Implants

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