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Reactive component selection for TET powered medical devices.

Ho Yan Leung¹, David M Budgett, Patrick Hu

¹Auckland Bioengineering Institute, University of Auckland, Auckland 1142, New Zealand. hleu025@auckland.ac.nz

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 19, 2012

Summary

This summary is machine-generated.

This study presents an optimization method to select tuning capacitors for transcutaneous energy transfer (TET) systems. The new procedure minimizes power loss in implantable TET coils, improving efficiency for medical devices.

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Area of Science:

Biomedical Engineering
Electrical Engineering
Medical Devices

Background:

Transcutaneous energy transfer (TET) systems power implantable devices wirelessly, avoiding infection risks from percutaneous wires.
These systems utilize high-frequency magnetic fields to bridge the coupling gap between external and implanted coils.

Purpose of the Study:

To introduce a novel optimization procedure for selecting tuning capacitors in implantable TET systems.
To minimize power dissipation within the power transfer coils, thereby enhancing overall system efficiency.

Main Methods:

Developed an objective function to determine optimal resonant capacitor configurations for specific TET coils.
Analyzed overall circuit impedance to understand power dissipation variations in Zero Voltage Switched TET systems.
Calculated resonant capacitor values for a 15W system operating across a coupling range of k=0.1 to 0.55.

Main Results:

The optimization procedure successfully identifies capacitor values that minimize power loss in TET coils.
Demonstrated that Zero Voltage Switched TET systems can exhibit varying power dissipation levels for identical power delivery.
The method is effective for systems requiring 15W power transfer with coil separations up to 20mm.

Conclusions:

The proposed optimization method effectively reduces power loss in implantable TET systems.
Optimized capacitor selection enhances the efficiency and safety of wireless power transfer for medical implants.
This approach provides a valuable tool for designing more efficient and reliable TET systems.