Wireless Power Transmitter Adaptive Frequency and Impedance Control
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Solution Overview
Problem
Wireless power transmission efficiency and stability are compromised when the positions of the wireless power transmitter and receiver change, leading to misalignment of coils and decreased power transfer efficiency.
Innovation Solution
A method and apparatus for a wireless power transmitter that uses a variable resonator and controller to transmit ping signals with different frequencies, adjust impedance based on response signals, and adapt capacitance to optimize power transfer, ensuring efficient power transmission even with changes in position or device characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the wireless power transmitter uses a fixed frequency and impedance, then the device structure is simple, but power transmission efficiency decreases when positions change or coils are misaligned
Solution Approach 1:
The patent implements dynamic frequency adjustment by transmitting multiple ping signals at different frequencies and selecting the optimal frequency based on receiver response. The transmitter dynamically changes operating frequency and impedance based on detected position and alignment conditions, transforming a static system into an adaptive one that maintains high efficiency under varying conditions.
Solution Approach 2:
The patent changes physical parameters (frequency, impedance, capacitance) of the transmitter based on detected conditions. By measuring object detection signals and adjusting resonant frequency and impedance accordingly, the system optimizes power transfer efficiency for different positions and alignment states without requiring complex mechanical adjustments.
2Reliability
If the wireless power transmitter transmits multiple ping signals with different frequencies, then power transmission efficiency is maintained under position changes, but device complexity and control complexity increase
Solution Approach 1:
The patent employs feedback mechanisms where the transmitter monitors object detection signals and receiver responses to ping signals. Based on this feedback, the controller automatically adjusts frequency, impedance, and capacitance settings. This closed-loop control system maintains reliable power transmission by continuously adapting to changing conditions without requiring manual intervention.
Solution Approach 2:
The transmitter performs self-adjustment by automatically detecting position changes through object detection signals and autonomously selecting optimal ping signal frequencies and impedance values. The system serves itself by making real-time adjustments without external control, reducing the need for complex external control systems while maintaining transmission reliability.
3Adaptability or versatility
If the wireless power transmitter adjusts impedance dynamically, then adaptability to different positions and devices is improved, but manufacturing complexity and calibration difficulty increase
Solution Approach 1:
The patent incorporates variable capacitors and adjustable impedance circuits into the transmitter design during manufacturing. These components are pre-configured to allow dynamic adjustment, and the system includes built-in calibration routines that automatically determine optimal settings during initial setup or first use, reducing the burden on manufacturers and simplifying field calibration.
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 solution enables stable and efficient wireless power transmission by adaptively matching impedance and capacitance, ensuring reliable charging across various positions and device types, thereby maintaining power transfer efficiency.
Implementation Method 1
a power transmitter configured to wirelessly transmit power using a variable resonator
Implementation Method 2
a variable resonator configured to adjust an impedance of the wireless power transmitter in response to a signal received from the wireless power receiver in response to the ping signals
Data Source
AI summary
A method of controlling a wireless power transmitter includes actuating the wireless power transmitter to transmit a beacon signal, determining approach of an external object according to a detected change in the beacon signal, and transmitting ping signals having different frequencies responsive to the determined approach of the external object.