Wired full-duplex communication and power delivery for medical implantable systems
Author(s)
Mifsud, Andrea
Type
Dissertation
Abstract
Emerging applications for implantable devices require multi-node systems with intrabody transmission of power and data through wireline interfaces. Forming part of the CANDO project, this work provides the design and implementation of a PCB-based, master chest device. It focuses on achieving an efficient and AC-coupled system; providing an interface for power delivery and full-duplex data communication. Such an interface is used by a single master and multiple slave devices; utilising a parallel-connected 4-wire implantable cable. A novel adaptive power delivery method that makes use of closed loop dynamic regulation is being proposed. Regulation is attained within the master unit by closed
loop monitoring of the current consumption owing through the wired link. Simultaneous power transfer and full-duplex data communication are achieved by superimposing the power carrier and downlink data over two wires, and the uplink data over a second pair of wires. Measured results using a fully isolated (AC coupled) 4-wire lead, demonstrate that this implementation can transmit up to 120mW of power at 6V (at the slave device, after eliminating any losses). The master device has a maximum system efficiency of 86 %, with a dominant dynamic power loss, and a maximum power transmission efficiency of 50 %. A 6V constant supply at the slave device is recovered 1.5 ms after a step of 22 mA. Downlink and uplink communication are achieved at a bit rate of 100 kbps and 1.6 Mbps
respectively. The achieved bit error rate of the uplink is less than 1 %.
loop monitoring of the current consumption owing through the wired link. Simultaneous power transfer and full-duplex data communication are achieved by superimposing the power carrier and downlink data over two wires, and the uplink data over a second pair of wires. Measured results using a fully isolated (AC coupled) 4-wire lead, demonstrate that this implementation can transmit up to 120mW of power at 6V (at the slave device, after eliminating any losses). The master device has a maximum system efficiency of 86 %, with a dominant dynamic power loss, and a maximum power transmission efficiency of 50 %. A 6V constant supply at the slave device is recovered 1.5 ms after a step of 22 mA. Downlink and uplink communication are achieved at a bit rate of 100 kbps and 1.6 Mbps
respectively. The achieved bit error rate of the uplink is less than 1 %.
Version
Imperial Users only
Editor(s)
Ghoreishizadeh, Sara S
Liu, Yan
Date Issued
2017-09-08
Date Awarded
2017
Citation
2017
Creator
Mifsud, Andrea
Description Note
Distinction
Publisher Department
Electrical and Electronic Engineering
Publisher Institution
Imperial College London
Qualification Level
Masters
Qualification Name
MSc
Course Name
Analogue and Digital Integrated Circuit Design