Electromechanical Resonator Reactance Tuning for Wireless Power Detuning
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Solution Overview
Problem
Wireless power transfer systems face inefficiencies due to impedance mismatches and detuning issues caused by varying electromagnetic properties of different devices, leading to reduced operating efficiency and power transfer losses.
Innovation Solution
An electromechanically controlled wireless power transmitter that includes a resonator circuit with an electromechanical reactive device, which can adjust its reactance to maintain a predetermined resonant frequency, using a controller to actuate the device based on sensed voltage and current levels, ensuring efficient power transfer by retuning the resonator circuit when detuned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the resonator circuit uses fixed reactance components, then the device complexity is reduced, but the system cannot adapt to varying impedance of different receiving devices, causing detuning and power transfer losses
Solution Approach 1:
The patent applies dynamics by making the reactance components adjustable rather than fixed. The resonator circuit includes variable inductance and capacitance that can be dynamically changed to match the impedance of different receiving devices, allowing the system to adapt while maintaining manageable complexity through controlled adjustment mechanisms.
Solution Approach 2:
The patent changes the parameters of the resonator circuit by varying the inductance and capacitance values. This is achieved through moveable components that alter the physical configuration of the reactive elements, enabling the system to adapt to different device impedances by adjusting these key electrical parameters.
2Loss of energy
If the resonator circuit is retuned dynamically, then power transfer efficiency is maintained, but additional control mechanisms and moveable components increase device complexity
Solution Approach 1:
The patent implements feedback by monitoring the resonant frequency and impedance matching status of the wireless power transfer system. Based on this feedback, the control mechanism adjusts the reactance components to maintain optimal power transfer efficiency, minimizing energy losses while using intelligent control to manage system complexity.
Solution Approach 2:
The system performs self-adjustment by automatically detecting detuning conditions and retuning the resonator circuit without external intervention. The moveable components are actuated based on system performance metrics, allowing the system to self-correct and maintain efficiency while reducing the need for complex external control.
3Reliability
If electromechanical reactive devices with moveable components are used, then reactance can be adjusted to maintain resonant frequency, but the mechanical components increase device complexity and potential failure points
Solution Approach 1:
The patent reduces mechanical complexity by substituting purely mechanical adjustment mechanisms with electromechanical or electronically-controlled systems. The moveable components are actuated through controlled fields rather than manual mechanical means, improving reliability while minimizing the number of mechanical parts that could fail.
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 maintains efficient power transfer by dynamically adjusting the resonator circuit's reactance to match the changing impedance of receiving devices, thereby minimizing losses and ensuring consistent operation across a range of devices.
Implementation Method 1
a resonator circuit configured to generate a magnetic field that can couple to a power receiving unit for wireless power transfer
Implementation Method 2
The electromechanical reactive device may include one or more moveable components and have a reactance that is determined by a physical arrangement of the components
Data Source
AI summary
An apparatus is disclosed for wireless power transmission. The apparatus may include a resonator circuit configured to generate a magnetic field to couple to a power receiving unit. The resonator circuit may include a transmit coil and an electromechanical reactive device having one or more moveable components, and having a reactance that is determined by a physical arrangement of those components. A power circuit connected to the resonator circuit can provide power to drive the transmit coil to generate the magnetic field. The electromechanical reactive device of the resonator circuit can be actuated to change the physical arrangement of the one or more moveable components, and hence change the reactance.