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Updated: May 9, 2026

An Isolated Working Heart System for Large Animal Models

An Isolated Working Heart System for Large Animal Models

Published on: June 11, 2014

Power flow control based solely on slow feedback loop for heart pump applications.

Bob Wang¹, Aiguo Patrick Hu, David Budgett

¹Department of Electrical and Computer Engineering, The University of Auckland, Auckland 1142, New Zealand. bwan033@aucklanduni.ac.nz

IEEE Transactions on Biomedical Circuits and Systems

|July 16, 2013

Summary

This study introduces a novel power flow controller for transcutaneous energy transfer (TET) in implantable heart pumps. The new method simplifies the design by eliminating extra components, achieving 79.6% efficiency.

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Area of Science:

Biomedical Engineering
Electrical Engineering
Power Electronics

Background:

Implantable heart pumps require reliable power delivery through transcutaneous energy transfer (TET).
Existing TET power flow controllers often necessitate complex primary converters with additional switching devices and resonant capacitors.
These complexities increase component count and potentially reduce overall system efficiency and reliability.

Purpose of the Study:

To develop a simplified and efficient power flow control method for TET systems powering implantable heart pumps.
To eliminate the need for fast feedback loops and associated extra components in the primary converter.
To ensure zero voltage switching (ZVS) and maintain stable power delivery to the implantable device.

Main Methods:

A novel power flow controller is proposed, relying on a slow feedback loop to directly drive the primary converter.
The controller utilizes a controlled change in switching frequency to adjust the resonant tank shorting period in a current-fed push-pull resonant converter.
This frequency modulation alters the primary resonant voltage magnitude and the resonant tank tuning.

Main Results:

The proposed controller was successfully implemented using an analog circuit.
An end-to-end power efficiency of 79.6% was achieved at a 10 W power level.
The controller operated effectively within a switching frequency regulation range of 149.3 kHz to 182.2 kHz, demonstrating stable power flow control.

Conclusions:

The developed power flow controller offers a simplified and efficient solution for TET in implantable heart pump applications.
Eliminating extra components leads to a more robust and potentially cost-effective system.
The method successfully regulates power flow while ensuring zero voltage switching and high efficiency.