Resonant Coil-Capacitor Layout for Longer-Range Wireless Power
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Solution Overview
Problem
Current wireless power transfer technologies, particularly magnetic induction methods, face limitations in power transfer distance and location freedom due to sensitivity in coil matching, and magnetic resonance methods suffer from inefficiencies in energy transmission over longer distances.
Innovation Solution
A wireless power transmission apparatus that includes primary coils connected with condensers to reduce reflected power and utilizes a detection circuit to generate control signals based on current or voltage measurements, along with additional condensers to minimize noise and optimize energy transfer through resonance phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If magnetic induction method is used for wireless power transfer, then transmission efficiency is improved, but power transfer distance is limited and location freedom is reduced
Solution Approach 1:
The patent changes the operating parameters by using magnetic resonance frequency matching between primary and secondary coils, enabling efficient power transfer over distances of several tens of centimeters to several meters, thus resolving the contradiction between transmission efficiency and power transfer distance
Solution Approach 2:
The system dynamically adjusts the resonance frequency to match between transmitting and receiving coils, allowing the power transfer system to adapt to varying distances and maintain high efficiency, thereby improving both transmission efficiency and location freedom
2Length of moving object
If magnetic resonance method is used for wireless power transfer, then power transfer distance is extended, but energy transmission efficiency deteriorates
Solution Approach 1:
The patent optimizes the resonance frequency parameter to achieve a balance where power can be transferred over distances of several tens of centimeters to several meters while maintaining acceptable energy transmission efficiency through precise frequency matching
Solution Approach 2:
The system uses feedback mechanisms to detect and adjust the resonance frequency in real-time, ensuring optimal energy transfer efficiency is maintained even as power transfer distance varies, thus resolving the efficiency deterioration issue
3Loss of energy
If coil matching sensitivity is increased for magnetic induction, then transmission efficiency is improved, but location freedom is significantly reduced
Solution Approach 1:
The magnetic resonance system dynamically adjusts to different positions and orientations by tuning the resonance frequency, reducing sensitivity to precise coil alignment and thereby improving location freedom while maintaining transmission efficiency
Solution Approach 2:
By changing from magnetic induction to magnetic resonance coupling and adjusting the resonance frequency parameter, the system achieves both high transmission efficiency and greater location freedom, as resonance coupling is less sensitive to coil matching precision
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 efficiently reduces carrier power loss in contactless charging systems, enabling more effective and flexible wireless power transmission over longer distances with improved energy transfer efficiency.
Implementation Method 1
In the magnetic induction method, energy is transmitted using a current induced at a receiving side coil due to a magnetic field generated in a coil battery cell at a transmitting side in accordance with electromagnetic coupling between a coil at the transmitting side and a coil at the receiving side
Implementation Method 2
first and second condensers configured to be connected to both ends of the power supply unit and the primary coil, respectively
Implementation Method 3
The magnetic resonance method is similar to the magnetic induction method in that both methods use a magnetic field. However, in the magnetic resonance method, a resonance occurs when a specific resonance frequency is applied to the coil at the transmission side and the coil at the reception side
Data Source
AI summary
The present specification relates to a wireless power transmission device. The present specification provides a wireless power transmission device comprising: a power supply unit for supplying power to the wireless power transmission device; at least one first coil for transmitting power to a wireless power reception device; and first and second condensers configured so as to be connected respectively to different both ends of the power supply unit and the first coil.