Closed-loop inductive link for wireless powering of a high density electrode array retinal prosthesis

David C. Ng, Gordana Felic, Efstratios Skafidas, Shun Bai

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

9 Citations (Scopus)

Abstract

A retinal prosthesis intended for rehabilitation of vision impaired patients will require continuous power supply in order to achieve real-time moving images. In this work, we explore the use of inductive coils fabricated using flexible circuit technologies for inductive powering of the implanted prosthetic device. We found that manufacturing technologies dictate the optimum operating frequency of the coil. For a minimum track width and spacing of 4 mils, the optimum frequency was found to be 2.9 MHz. We also looked at the distribution of electric and magnetic fields generated by the inductive coils in and surrounding the eye. These simulation results show that there are electric field concentrations around the conductive coils. Apart from the coils, we need to design an efficient circuit to drive the transmit coil and recover the transmitted power. In order to maintain optimal operation of the link, a closed-loop load modulation feedback operation is proposed. Adaptive control using back-telemetry of the induced voltage on the secondary side can close the power supply loop and result in optimum power transfer by boosting the supply voltage on the primary side when load is high and reducing this voltage when load is small.

Original languageEnglish
Title of host publicationElectromagnetic Compatibility Symposium Adelaide 2009, EMCSA 2009 - Symposium Proceedings
Pages92-97
Number of pages6
DOIs
Publication statusPublished - 2009
Externally publishedYes
EventElectromagnetic Compatibility Symposium Adelaide 2009, EMCSA 2009 - Adelaide, Australia
Duration: 17 Sep 200918 Sep 2009

Publication series

NameElectromagnetic Compatibility Symposium Adelaide 2009, EMCSA 2009 - Symposium Proceedings

Conference

ConferenceElectromagnetic Compatibility Symposium Adelaide 2009, EMCSA 2009
Country/TerritoryAustralia
CityAdelaide
Period17/09/0918/09/09

Keywords

  • Inductive
  • Retina prosthesis
  • Wireless power

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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