Wireless Charging Frequency Tracking via Capacitance Adjustment
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Solution Overview
Problem
Conventional methods for maintaining optimal frequency points in wireless charging systems have low matching accuracy and speed, and can lower transmission efficiency, especially when the transmission distance varies.
Innovation Solution
A high efficiency wireless charging system and its control method that performs impedance matching on an antenna to keep resonant frequency points within an operating range, tracing optimal frequency points by sending sensing signals and adjusting capacitance values to meet transmission requirements, ensuring high efficiency across varying distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional impedance matching methods (adding impedance matching circuit or adjusting power amplifier parameters) are used to keep resonant frequency points in the operating frequency range, then the resonant frequency can be adjusted to the operating range, but the matching accuracy is low and the matching speed is low
Solution Approach 1:
The patent adjusts the capacitance value of the capacitor in real-time based on the calculated optimal frequency point to dynamically maintain the resonant frequency within the operating range. This parameter change approach enables both high matching accuracy and fast response to transmission distance variations
Solution Approach 2:
The system continuously monitors the transmission distance, calculates the optimal frequency point using the coupling of inductance and capacitance formulas, and adjusts the capacitor's capacitance value accordingly. This closed-loop feedback mechanism ensures high matching accuracy and fast adaptation to changing transmission conditions
2Loss of energy
If the transmission distance between the wireless charger and the charged device varies, then the transmission efficiency decreases when the optimal frequency point is beyond the operating frequency range, but adjusting the frequency is needed to maintain efficiency
Solution Approach 1:
The system dynamically adjusts the operating frequency by changing the capacitance value based on real-time transmission distance measurements. This dynamic adaptation ensures the resonant frequency remains within the operating range regardless of transmission distance variations, maintaining high transmission efficiency
Solution Approach 2:
The patent changes the capacitance parameter of the capacitor according to the calculated optimal frequency point to adapt the system's resonant frequency to varying transmission distances, ensuring optimal transmission efficiency across different operating conditions
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 provides a more accurate and efficient method for defining optimal frequency points, maintaining high efficiency even with changes in transmission distance, outperforming conventional methods in terms of matching accuracy and speed.
Implementation Method 1
A wireless charger transmits power to a charged device by inductive coupling
Implementation Method 2
the wireless charger has to transmit the power by resonant inductive coupling to increase the effective transmission distance of wireless charging
Implementation Method 3
resonant inductive coupling
Data Source
AI summary
A control method for a wireless charging system has steps of performing impedance matching on an antenna of the wireless charging system; tracing an optimal frequency point by sending a sensing signal with a default transmission frequency, and calculating a transmission efficiency of the sensing signal; determining whether the transmission efficiency meets a transmission requirement. When the transmission efficiency does not meet the transmission requirement, repeats the previous steps with another default transmission frequency until the transmission efficiency meeting the transmission requirement. When the transmission efficiency meeting the transmission requirement, the default transmission frequency is defined as the optimal frequency point for charging. Setting the optimal frequency point as an operating frequency of the wireless charging system for charging The optimal frequency point defined by the above steps can maintain high efficiency of the wireless charging system against the variable transmitting distances.