Wireless Power Receiver Variable Inductance Frequency Matching
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Solution Overview
Problem
Conventional wireless power transmission systems face inefficiencies due to mismatched frequency bands between transmitters and receivers, requiring multiple coils to cover various frequency bands, which limits power transmission distance and efficiency.
Innovation Solution
A wireless power receiver equipped with a reception coil, a frequency detecting unit, and an inductance varying unit that adjusts the coil's inductance to match the detected frequency band of the transmitter, ensuring optimal power transmission across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a receiver uses a fixed frequency band, then the device complexity is reduced, but power transmission efficiency deteriorates when frequency bands do not match
Solution Approach 1:
The patent implements a variable inductance unit that dynamically adjusts the inductance of the reception coil based on the detected frequency band of the transmitted power. This dynamic adjustment allows the receiver to adapt to different frequency bands (first frequency band or second frequency band) without requiring multiple fixed coils, thereby maintaining power transmission efficiency while avoiding increased device complexity
Solution Approach 2:
The patent changes the inductance parameter of the reception coil according to the detected frequency band. When the first frequency band is detected, the variable inductance unit adjusts the inductance to a first value; when the second frequency band is detected, it adjusts to a second value. This parameter change enables efficient power reception across different frequency bands using a single coil structure
2Loss of energy
If multiple coils are used to cover various frequency bands, then power transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent makes a single reception coil universal by equipping it with a variable inductance unit that can adjust its inductance to match different frequency bands. This single coil performs the function of multiple fixed coils would otherwise be needed, enabling the receiver to efficiently handle both first and second frequency bands without increasing device complexity
Solution Approach 2:
Instead of using multiple static coils for different frequency bands, the patent employs one dynamic coil with adjustable inductance. The variable inductance unit allows the single coil to adapt its characteristics to match the transmitted frequency band, eliminating the need for multiple coils while maintaining power transmission efficiency
3Device complexity
If the receiver uses a fixed inductance value, then the device complexity is reduced, but adaptability to different frequency bands deteriorates
Solution Approach 1:
The patent replaces fixed inductance with a dynamic variable inductance unit that can adjust its inductance value based on the detected frequency band. This dynamic capability enables the receiver to adapt to both first and second frequency bands while maintaining a simple single-coil structure, thus improving adaptability without increasing device complexity
Solution Approach 2:
The patent implements a feedback mechanism where the frequency detecting unit detects the frequency band of transmitted power and provides this information to the variable inductance unit. Based on this feedback, the variable inductance unit adjusts the inductance to the appropriate value, enabling automatic adaptation to different frequency bands
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 enhances power transmission efficiency by dynamically matching the receiver's frequency band to the transmitter's, allowing for stable and efficient charging regardless of the frequency used, thereby improving user convenience and compatibility with various wireless power standards.
Implementation Method 1
a reception coil to receive power having a first frequency band from the wireless power transmitter... through a magnetic field
Implementation Method 2
an inductance varying unit to change an inductance of the reception coil according to the detected frequency band
Data Source
AI summary
A wireless power receiver to wirelessly receive power from a wireless power transmitter comprises a reception coil to receive the power wirelessly transmitted from the wireless power transmitter through a magnetic field, a frequency detecting unit to detect a frequency band of the power transmitted from the wireless power transmitter and an inductance varying unit to change an inductance of the reception coil according to the detected frequency band.