Wireless Power Transfer Secondary Coil Ferrite Rod Orientation
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Solution Overview
Problem
Conventional wireless power transfer systems for implantable biomedical telemetry devices face challenges in providing continuous power to small animals like rodents, especially due to loose coupling between primary and secondary coils, which limits power transfer and requires frequent battery replacements or transcutaneous wiring, and are unable to maintain high-quality data acquisition for extended periods.
Innovation Solution
The implementation of a wireless power transfer system using a secondary coil with integrated ferrite components, such as ferrite rods angled at specific orientations, to enhance magnetic resonant coupling and improve power transfer efficiency, allowing for continuous operation of telemetric devices for several hours to weeks without the need for battery replacements or wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional wireless power transfer systems are used with simple coil configurations, then the device structure remains simple, but power transfer efficiency is insufficient and continuous operation cannot be maintained
Solution Approach 1:
The patent introduces ferrite rods as magnetic shielding materials integrated within the coil structure. These ferrite components enhance the magnetic field coupling between primary and secondary coils, significantly improving power transfer efficiency. The composite structure of coil windings combined with ferrite rods creates an optimized magnetic pathway that reduces energy loss while maintaining a manageable device form factor.
Solution Approach 2:
The patent positions ferrite rods at specific angular orientations (e.g., 45 degrees) relative to the coil axis, introducing a dimensional aspect to the coil structure. This angular arrangement creates multiple magnetic coupling pathways that enhance power transfer efficiency from multiple directions, addressing the limitation of conventional single-orientation coil designs.
2Duration of action of moving object
If battery-operated implants are used, then the device can operate independently, but battery size and weight limit the duration of operation and require frequent replacements
Solution Approach 1:
The patent replaces the mechanical battery system with a wireless power transfer system. Instead of relying on stored chemical energy in batteries, the implant receives continuous power wirelessly through enhanced magnetic coupling between external and internal coils. This substitution eliminates the need for battery weight and enables indefinite operation duration limited only by the external power source.
Solution Approach 2:
The wireless power transfer system enables the implant to recharge itself continuously through the enhanced magnetic coupling mechanism. The ferrite rod configuration ensures that the implant can maintain sufficient power levels without external intervention for battery replacement, effectively making the system self-sustaining during the experimental duration.
3Reliability
If transcutaneous wiring is used to provide power, then continuous power can be supplied, but the risks of infection and tissue damage increase
Solution Approach 1:
The patent replaces transcutaneous wiring with a wireless power transfer system using enhanced magnetic coupling through ferrite rods. This substitution eliminates the need for penetrating the skin, thereby removing the pathway for infection and tissue damage while maintaining reliable power supply through the non-invasive magnetic field coupling.
4Adaptability or versatility
If the rodent moves freely with changing orientation, then natural behavior is maintained, but coupling loss between primary and secondary coils increases
Solution Approach 1:
The patent addresses orientation variability by positioning ferrite rods at multiple angular orientations within the coil structure (e.g., 45-degree angles). This multi-directional configuration creates redundant magnetic coupling pathways, ensuring that at least some effective coupling exists regardless of the rodent's orientation during movement, thereby reducing coupling loss while maintaining movement freedom.
Solution Approach 2:
The integration of ferrite rods with the coil structure creates a composite system that enhances magnetic field distribution in three-dimensional space. This composite configuration improves the robustness of power transfer against orientation changes by providing multiple magnetic flux pathways that remain effective across a range of angles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient and continuous power transfer to telemetric devices, maintaining high-quality data acquisition and transmission for extended periods, even with changing orientations of the rodent, thereby reducing the risks associated with battery replacements and transcutaneous wiring.
Implementation Method 1
The at least one ferrite rod can have a rod axis that is at an angle of about 0° to about 85° relative to an axis of the coil. In some embodiments, the rod axis of the at least one ferrite rod is at an angle of 45°.
Implementation Method 2
a receiving component, such as a rectifier, coupled to the coil so as to receive an electrical voltage induced in the coil
Data Source
AI summary
Disclosed herein are embodiments of a novel WPT system to deliver power from a stationary source (e.g., a primary coil) to a moving telemetric device (e.g., a secondary coil) via magnetic resonance coupling. Novel configurations of the secondary employing ferrite components placed at specific locations and orientations within the coil. Embodiments of these secondary coil configurations are constructed and their performance is tested. Measurements show that ferrite components improved power transfer at most orientations, beyond that of the nominal ferrite-less configuration. The use of angled ferrite components further improved power transfer.