Active Variable Reactance Tuning for LC Resonator Frequency Control
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Solution Overview
Problem
In resonant wireless power systems, precise control over resonant frequencies is essential for optimizing performance, especially when the driving frequency is fixed or multiple resonators are present, due to detuning caused by component variations and environmental interactions, which existing technologies struggle to achieve efficiently and cost-effectively.
Innovation Solution
The implementation of an active variable reactance system using a single electrically-controllable switching device to adjust the duty cycle, allowing for continuous tuning of LC resonators without the need for electromechanical devices or non-linear reactances, thereby maintaining efficiency and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromechanical devices or non-linear reactances are used to tune resonators, then resonant frequency control is achieved, but device complexity and cost increase
Solution Approach 1:
The patent replaces electromechanical tuning devices with an electronically-controlled switching circuit that uses a linear reactance and pulse-width modulation to achieve continuous resonant frequency tuning. This substitution eliminates mechanical moving parts and complex non-linear reactance components while maintaining precise frequency control capability.
Solution Approach 2:
The patent changes the operating parameters by using a linear reactance component operated in a non-linear regime through pulsed switching. By controlling the duty cycle of the switching element, the effective reactance value is continuously adjusted, enabling resonant frequency tuning without requiring physically variable components.
2Loss of energy
If quality factor of resonators is increased to improve wireless power transfer efficiency, then power transfer efficiency improves, but resonant frequency tolerance decreases
Solution Approach 1:
The patent introduces dynamic frequency tuning capability by implementing an electronically-controlled switching circuit that can continuously adjust the resonant frequency in real-time. This allows the system to adapt to frequency drift and maintain optimal power transfer efficiency even when operating conditions change, effectively decoupling the high Q-factor requirement from strict frequency tolerance constraints.
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
This approach enables precise control over resonant frequencies, maintaining high RF power transfer efficiency and reducing system complexity, while being cost-effective and adaptable to high-power wireless power systems.
Implementation Method 1
Resonant wireless power systems make use of magnetic or electric coupling between LC resonators in order to transfer electric power. The efficiency of such systems is dependent on the quality factors of the resonators, with higher quality factors resulting in higher wireless power transfer efficiency.
Data Source
AI summary
Various embodiments for controlling a resonant frequency of a resonator are described. A system includes at least one resonant circuit and an active variable reactance circuit that controls a resonant frequency of the at least one resonant circuit. The active variable reactance circuit includes an electrically-controllable switching element and a switch controller sub-circuit configured to switch the electrically-controllable switching element at a frequency of a radio-frequency (RF) current or voltage passing through or across a device such that the RF current flowing from a first terminal to a second terminal is substantially sinusoidal.