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Wireless Power transfer to biomedical implants has been an established phenomenon. Safety considerations in terms of bio-compatibility, electrical & mechanical safety and performance studies relating to clinical use have been lacking. In this work we present the preliminary study of trade-offs between performance and bio-compatibility & electrical safety of wireless power transfer links used...
An efficient resonant tuned wireless power transfer (WPT) link using inductive coupling has been proposed for the neural implant application in this work. The power link is optimized for an operating frequency of 10 MHz using coil, load and frequency optimization. The lossy tissue model was used to mimic the power loss in tissue and the simulated (HFSS) peak SAR values were within the allowed limit...
Wireless Power Transfer (WPT) using inductive coupling is an essential method to power biomedical implants as it provides a hassle-free alternative to batteries and dangling wires. The Power Transfer Efficiency (PTE) of the inductively coupled link is a key quality metric using which the link is evaluated. In this paper, we address the various different methods to improve the PTE of inductively coupled...
Coil Misalignment in wireless power transfer links that use inductive coupling has limited the wireless power transfer efficiency considerably. Motion artifacts leading to coil misalignments also results in intermittent power outage at the receiving coil. In this paper, we address these issues using the concept of flux sharing between three coils. By using magnetic fields of induced currents in an...
The problem of choosing the right topology for a wireless power transfer (WPT) application to maximize power transfer efficiency has been presented and addressed in this work. We analyze the series and parallel resonant topologies used in inductively coupled links, derive the efficiency expressions and verify them experimentally using planar inductors built on a PCB. We compare and contrast the two...
Wirelessly coupled coils are crucial for efficient power transmission in implantable biomedical devices. Previous design methods are only eligible for improving the efficiency of circular or square coils. This paper presents a method of characterizing and optimizing rectangular coils frequently used in inductively coupled systems. After a lumped component model is set up for inductive coils, the efficiency...
In this paper we evaluate the use of high frequency inductive links to transfer power wirelessly to short distances using inductive coupling, which finds typical use in biomedical implants and wireless chargers. We provide an optimization procedure for the wireless power link design for higher power transfer efficiency by considering an example application. Finally we verify our optimized design using...
Inductive coupling is considered as one of the main stream techniques in wireless power transmission for implantable devices. In this paper, we present a generic analysis of the different topologies for wireless power transfer and arrive at boundary frequencies that separate various topologies, thereby allowing users to identify the topology that best suits the application requirements. In the meantime,...
This paper presents a study on the efficiency of wireless power transfer (WPT) via inductive coupling, used in implantable biomedical devices. The expressions for efficiency of four different topologies used for WPT have been derived and a topology has been identified that is best suited for use with biomedical implants. The efficiency derived for the chosen topology is maximized and is compared with...
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