Open Access

ARTICLE

Optimization of Bio-Implantable Power Transmission Efficiency Based on Input Impedance

Bassm H. Abed¹, Jaber H. Majeed^1,*, Najma Abed Habeeb²
1 University of Technology, Department of Electrical Engineering, Baghdad, Iraq
2 Almansour University College, Communication Engineering Department, Baghdad, Iraq
* Corresponding Author: Jaber H. Majeed. Email:
(This article belongs to this Special Issue: Sensors and Nano-sensors Technologies for Health-Care Applications)

Computer Systems Science and Engineering 2021, 38(1), 17-24. https://doi.org/10.32604/csse.2021.015544

Received 27 November 2020; Accepted 23 January 2021; Issue published 01 April 2021

Abstract

Recently, the inductive coupling link is the most robust method for powering implanted biomedical devices, such as micro-system stimulators, cochlear implants, and retinal implants. This research provides a novel theoretical and mathematical analysis to optimize the inductive coupling link efficiency driven by efficient proposed class-E power amplifiers using high and optimum input impedance. The design of the coupling link is based on two pairs of aligned, single-layer, planar spiral circular coils with a proposed geometric dimension, operating at a resonant frequency of 13.56 MHz. Both transmitter and receiver coils are small in size. Implanted device resistance varies from 200 Ω to 500 Ω with 50 Ω of stepes. When the conventional load resistance of power amplifiers is 50 Ω, the efficiency is 45%; when the optimum resonant load is 41.89 Ω with a coupling coefficient of 0.087, the efficiency increases to 49%. The efficiency optimization is reached by calculating the matching network for the external LC tank of the transmitter coil. The proposed design may be suitable for active implantable devices.

---

Keywords

Inductive coupling link; power amplifier; matching network; implantable biomedical devices

---