Wireless Power Resonance Tracking for Variable Transmission Distance
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Solution Overview
Problem
Existing wireless power transmission systems using magnetic resonant coupling face challenges in detecting an optimal resonance frequency for maximum power transmission, especially when the transmission distance changes, leading to decreased efficiency.
Innovation Solution
A method and system for detecting an optimal resonance frequency by varying the system frequency within a preset range, measuring output voltage and power transmission efficiency, and determining the resonance frequency that maximizes power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If magnetic resonance method is used to extend transmission distance, then transmission distance is increased, but transmission efficiency becomes unstable and sharply decreases when resonance condition is not satisfied
Solution Approach 1:
The patent implements dynamic frequency adjustment by continuously varying the operating frequency within a predetermined range and detecting the resonance frequency in real-time. This allows the system to adapt to changing transmission distances and maintain optimal resonance conditions, resolving the instability of transmission efficiency when transmission distance changes
Solution Approach 2:
The patent employs feedback mechanisms by measuring the resonance frequency through voltage detection across the capacitor and using this information to adjust the operating frequency. This closed-loop control ensures the system maintains resonance conditions even when transmission distance varies, preventing sharp decreases in transmission efficiency
2Ease of operation
If resonance frequency is not optimized for changed transmission distance, then system operates at fixed frequency, but power transmission efficiency sharply decreases
Solution Approach 1:
The patent changes the operating frequency parameter dynamically by sweeping through a frequency range and identifying the resonance frequency where maximum power transfer occurs. This parameter adjustment ensures optimal power transmission efficiency even when transmission distance changes, counteracting the energy loss that would occur with fixed frequency operation
3Measurement precision
If frequency detection method is complex, then detection precision is improved, but device complexity increases
Solution Approach 1:
The patent uses a capacitor as an intermediary element to detect resonance frequency by measuring the voltage across it during frequency sweeping. This simple capacitive voltage measurement approach achieves accurate resonance frequency detection without requiring complex detection equipment or algorithms, maintaining low device complexity while ensuring measurement 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
The method effectively and quickly detects an optimal resonance frequency, enhancing power transmission efficiency and ensuring reliable operation even with changes in transmission distance.
Implementation Method 1
wireless power transmission system using magnetic resonant coupling of a transmission unit and a reception unit
Implementation Method 2
The magnetic induction method is a technology that uses magnetic induction coupling between adjacent coils
Implementation Method 3
determining a resonance frequency as an optimal resonance frequency when the measured output voltage value is equal to or greater than a preset receiving voltage determination value
Data Source
AI summary
The present invention relates to a wireless power transmission system for detecting an optimal resonance frequency and a method of detecting an optimal resonance frequency using the same, and provides a system and method for detecting an optimal resonance frequency for maximum wireless power transmission, the system and the method enabling an optimal resonance frequency for maximum power transmission to be effectively and quickly detected and enabling an optimal resonance frequency to be more precisely and accurately detected and found, even if a system usage situation changes, such as when a power transmission distance changes, in a wireless power transmission system of a magnetic resonant coupling scheme.