dc.contributor.advisor |
Hu, Aiguo Patrick |
en |
dc.contributor.advisor |
Budgett, David |
en |
dc.contributor.author |
Si, Ping |
en |
dc.date.accessioned |
2012-06-26T23:37:32Z |
en |
dc.date.available |
2012-06-26T23:37:32Z |
en |
dc.date.issued |
2008 |
en |
dc.identifier.citation |
Thesis (PhD--Electrical and Electronic Engineering)--University of Auckland, 2008 |
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dc.identifier.uri |
http://hdl.handle.net/2292/19187 |
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dc.description |
Full text is available to authenticated members of The University of Auckland only. |
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dc.description.abstract |
Implantable biomedical devices have found applications in a wide range of areas for both monitoring of signals from organs such as the heart and brain and also actuating outputs such as stimulators and pumps. The vast majority of smart implantable devices require electrical power. Batteries are an option but they have a finite lifetime, and cables or connectors through the skin pose infection risks. Systems using time varying magnetic fields to transfer power into the body have been successfully developed, however existing systems require precise alignment between internal and external resonant inductive components. This thesis presents advances in wireless power (WP) supply solutions based on inductively coupled power transfer (ICPT) technologies. The new methods proposed are valuable for both low power devices, such as physiological monitoring sensors and high power consumption devices such as heart assist devices. In particular, the new wireless power supply is robust to variations in coupling, and continuous power transfer is maintained in the presence of normal movement and motion in each application. A novel current-fed push-pull converter for a WP application is proposed in this thesis. This converter eliminates the use of any magnetic components so that the size and cost are reduced. In addition, a method for stabilizing the operating frequency of the push-pull converter is developed and implemented while maintaining full zero voltage switching operations. The implantable device of the wireless power supply has been developed using a parallel tuned resonant circuit. The maximum power transfer capability of the implantable device is determined in this thesis. The value of a dc inductor needed for achieving this capability is also determined. Dynamic detuning frequency control is applied to regulate power flow at the implantable side. The switching frequency of the dynamic detuning is analysed for the purposes of EMI filter design and switching device selection. A power flow control method based on primary input voltage regulation is presented. This method improves power efficiency because of reduced average current flowing through the primary track. In addition, a novel power control method based on primary operating frequency regulation is proposed. When the maximum power is demanded, the system dynamically adjusts the operating frequency to achieve the primary and secondary full tuning regardless of the load, coupling coefficient, and other circuit parameter variations. The wireless power supply developed in this thesis has been successfully used in physiological research. The research undertaken is also very useful for the next step development of the wireless power transfer technologies. |
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dc.publisher |
ResearchSpace@Auckland |
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dc.relation.ispartof |
PhD Thesis - University of Auckland |
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dc.relation.isreferencedby |
UoA99179203914002091 |
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dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. |
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dc.rights |
Restricted Item. Available to authenticated members of The University of Auckland. |
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dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
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dc.title |
Wireless power supply for implantable biomedical devices |
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dc.type |
Thesis |
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thesis.degree.discipline |
Electrical and Electronic Engineering |
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thesis.degree.grantor |
The University of Auckland |
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thesis.degree.level |
Doctoral |
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thesis.degree.name |
PhD |
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dc.date.updated |
2012-06-26T22:50:56Z |
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dc.rights.holder |
Copyright: The author |
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dc.identifier.wikidata |
Q112878262 |
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