Wireless Power Transmission Using Frequency Segmentation for Implantable Devices
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Solution Overview
Problem
Wireless power transmission efficiency for implantable devices varies significantly with the relative positions of transmission and reception coils, making precise alignment and efficient power transfer challenging.
Innovation Solution
A method using different frequency bands for position determination and power transmission, where a high frequency band is used for position information and a low frequency band for power transfer, allowing for accurate alignment and efficient power delivery by determining impedance variations and adjusting positions accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wireless power transmission is performed using a single frequency band, then the system complexity is reduced, but the power transmission efficiency varies significantly with relative coil positions
Solution Approach 1:
The patent segments the frequency spectrum into multiple bands, using a first frequency band for position determination signals and a second frequency band for power transmission. This segmentation allows the system to separately optimize for position detection accuracy and power transfer efficiency, resolving the contradiction between system simplicity and transmission efficiency by dividing functions across frequency domains.
Solution Approach 2:
The patent changes the frequency parameter by using different frequency bands for different functions. The first frequency band is optimized for position determination while the second frequency band is optimized for power transmission. This parameter differentiation enables the system to maintain high efficiency across varying coil positions without increasing overall system complexity.
2Loss of energy
If the transmission coil and reception coil are precisely aligned, then power transmission efficiency is improved, but the difficulty of detecting and measuring position increases
Solution Approach 1:
The patent introduces an intermediary position determination signal transmitted at a first frequency band that serves as a mediator between the transmission and reception coils. This intermediary signal enables accurate position detection without requiring complex measurement systems, as the signal's characteristics (such as impedance variations) directly indicate alignment status and relative position, thereby facilitating both efficient power transfer and easy position measurement.
3Measurement precision
If different frequency bands are used for position determination and power transmission, then the alignment accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent implements multi-functionality by enabling the transmission and reception coils to handle both position determination and power transmission functions. The coils themselves are universal components that operate across different frequency bands, eliminating the need for separate dedicated sensors or measurement devices. This universal approach improves alignment accuracy through precise frequency-based detection while avoiding the complexity increase that would result from adding separate hardware subsystems.
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 approach enables accurate alignment and enhances the efficiency of wireless power transmission to implantable devices by using distinct frequency bands for position determination and power transfer, ensuring optimal power delivery and reducing interference.
Implementation Method 1
The wireless device may wirelessly receive power from a wireless power transmission apparatus by an interaction with a transmission coil of the wireless power transmission apparatus
Implementation Method 2
A wireless power transmission apparatus includes a coil configured to transmit and receive the first signal and the second signal through coupling with the implantable device
Data Source
AI summary
A wireless power transmission method and apparatus are provided. The wireless power transmission method receives a signal associated with a relative position of the wireless power transmission based on a frequency in a high frequency band, and determines whether to wirelessly transmit a power based on an intensity of the received signal.