Variable Capacitor Resonance Control for Wireless Power Coupling
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Solution Overview
Problem
Conventional non-contact power supply facilities face limitations in power supply control due to restricted high-frequency power frequency assignments, which hinders effective power transmission.
Innovation Solution
A power transmission apparatus that includes a primary coil, a primary resonance coil, a secondary resonance coil, a secondary coil, a phase difference detector, and a variable capacitor, allowing for the determination of coupling degree between coils to optimize power transmission efficiency by adjusting resonance frequencies and phase differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional non-contact power supply facilities use fixed frequency assignments for high-frequency power, then regulatory compliance is maintained, but power transmission efficiency is limited
Solution Approach 1:
The patent applies dynamics by making the resonance frequency adjustable rather than fixed. The system includes a variable capacitor that allows the resonance frequency of the primary resonance coil to be changed dynamically, enabling the system to adapt to different transmission distances and loads while maintaining regulatory compliance through controlled frequency adjustment within authorized bands.
Solution Approach 2:
The patent implements parameter changes by varying the resonance frequency and coupling degree as control parameters. By changing the capacitance value of the variable capacitor, the system adjusts the resonance frequency to optimize power transmission efficiency for different operating conditions, transforming a static system into one that can respond to changing requirements.
2Length of stationary object
If the distance between transmission resonator and receiving resonator increases, then transmission range is extended, but power transmission efficiency decreases due to impedance variation
Solution Approach 1:
The patent implements feedback control by measuring the phase difference between voltage and current in the primary resonance coil and using this information to adjust the capacitance value. The determination part calculates the coupling degree based on phase difference changes, and the control part adjusts the variable capacitor to maintain optimal coupling conditions even as transmission distance varies, thereby maintaining transmission efficiency.
Solution Approach 2:
The system dynamically adjusts the resonance frequency and coupling degree based on the actual transmission distance. By continuously monitoring phase difference and recalculating optimal capacitance values, the system adapts to changing distances, extending the effective transmission range while maintaining efficiency through real-time parameter optimization.
3Device complexity
If fixed capacitance is used in the primary resonance coil, then system simplicity is maintained, but adaptability to different transmission conditions is reduced
Solution Approach 1:
The patent replaces fixed capacitance with a variable capacitor that can be adjusted dynamically. This adds a control dimension to the system, allowing adaptation to different transmission distances, loads, and coupling conditions. The variable capacitor enables the system to optimize resonance frequency and coupling degree for each operating condition, significantly enhancing versatility.
Solution Approach 2:
The variable capacitor serves multiple functions: it adjusts resonance frequency to match different operating requirements, optimizes coupling degree for various distances, and enables the system to operate efficiently across a wide range of conditions. This single component provides universal adaptability, allowing the same system to handle diverse transmission scenarios without requiring multiple specialized configurations.
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
Enables efficient power transmission by optimizing coupling degree and resonance frequencies, overcoming frequency assignment restrictions and enhancing transmission efficiency.
Implementation Method 1
a primary coil connected to an AC source; a primary resonance coil configured to receive power from the primary coil by electromagnetic induction
Implementation Method 2
a secondary resonance coil configured to receive power from the primary resonance coil by magnetic field resonance occurred between the primary resonance coil and the secondary resonance coil
Implementation Method 3
a secondary coil configured to receive power from the secondary resonance coil by electromagnetic induction
Data Source
AI summary
A power transmission apparatus includes a primary coil connected to an AC source; a primary resonance coil configured to receive power from the primary coil; a secondary resonance coil configured to receive power from the primary resonance coil by magnetic field resonance occurred between the primary resonance coil and the secondary resonance coil; a secondary coil configured to receive power from the secondary resonance coil; a phase difference detector detect a phase difference between a phase of voltage supplied to the primary resonance coil and a phase of current flowing through the primary resonance coil; a variable capacitor provided on the primary resonance coil; and a determination part determining a coupling degree between the primary resonance coil and the secondary resonance coil based on a change degree of the phase difference relative to a change amount of capacitance when the capacitance of the variable capacitor changes.