Shielded Coil Frequency Splitting for Wireless Power Leakage Control
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in improving power transmission efficiency and safety due to leakage magnetic fields, particularly in mobile phone and electric vehicle applications.
Innovation Solution
A wireless power transmission system utilizing a shielded coil and frequency division, where the inductive coupling coefficient between the transmitting and shielded coils is set to be greater than a critical coupling coefficient, allowing for frequency division phenomena to occur, enhancing power transmission efficiency at a fundamental frequency and offsetting leakage magnetic fields at higher frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inductive coupling is used for wireless power transmission, then power can be transmitted without physical cables, but leakage magnetic fields cause safety issues and reduce transmission efficiency
Solution Approach 1:
A shielded coil is introduced as an intermediary element between the transmitting coil and the environment. This shielded coil generates a magnetic field that opposes and cancels the leakage magnetic fields from the transmitting coil, thereby reducing harmful electromagnetic radiation while maintaining wireless power transmission functionality
Solution Approach 2:
The system adjusts the coupling coefficient between the transmitting coil and shielded coil to be greater than a critical value. This parameter change enables frequency division phenomena to occur, creating distinct frequency responses that allow the shielded coil to effectively counteract leakage fields at specific frequencies while maintaining power transmission efficiency
2Object-affected harmful factors
If the coupling coefficient between transmitting and shielded coils is increased to reduce leakage fields, then safety improves, but power transmission efficiency may be affected
Solution Approach 1:
The system utilizes dynamic frequency division phenomena that occur when the coupling coefficient exceeds a critical value. This creates two distinct frequency regions where the shielded coil can selectively cancel leakage fields at higher frequencies while maintaining efficient power transmission at the fundamental frequency, thus resolving the efficiency-safety trade-off
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
The system achieves improved power transmission efficiency and safety by optimizing the inductive coupling between coils, matching frequencies to enhance efficiency and minimize leakage magnetic fields.
Implementation Method 1
a first circuit including a transmitting coil for transmitting power; and a second circuit including a shielded coil
Implementation Method 2
inductive coupling wherein the first frequency is larger than a fundamental frequency of the first circuit and the second frequency is smaller than a third high frequency of the second circuit
Data Source
AI summary
Disclosed is a wireless power transmission system including a first circuit comprising a transmitting coil for transmitting power; and a second circuit comprising a shielded coil, wherein, in the transmitting coil and the shielded coil, frequency division wherein an impedance magnitude of the second circuit is minimized at a first frequency smaller than a resonant frequency of the second circuit and a second frequency larger than the resonant frequency of the second circuit occurs, and inductive coupling wherein the first frequency is larger than a fundamental frequency of the first circuit and the second frequency is smaller than a third high frequency of the second circuit.