Wireless Power Resonance Tuning Heuristics
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Solution Overview
Problem
In wireless power transfer systems, the efficiency and power transfer are affected by factors like distance and orientation of coils, and the ability to tune resonance frequencies independently within the transmitter or receiver is desirable to improve power transfer efficiency, especially in scenarios with low coupling coefficients.
Innovation Solution
The implementation of heuristics for tuning dual series resonance circuits, including iterative and single-pass methods, to match the self-resonant frequency of the primary and secondary coils, allowing for improved power transfer by adjusting circuit parameters such as capacitance to align resonance modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the transmitter and receiver operate at different resonance frequencies, then the system can function with simple fixed-frequency circuits, but power transfer efficiency decreases
Solution Approach 1:
The patent implements dynamic resonance frequency tuning by adjusting circuit parameters (such as capacitance values) based on measured coupling coefficients. The system transitions from fixed-frequency operation to adaptive frequency selection, allowing the transmitter and receiver to operate at optimal resonant frequencies that maximize power transfer efficiency under varying coupling conditions
Solution Approach 2:
The system employs feedback mechanisms where the coupling coefficient is measured between transmitter and receiver coils, and this measurement is used to adjust the resonance frequency of one or both circuits. The feedback loop continuously optimizes the operating frequency to maintain maximum power transfer efficiency as coupling conditions change
2Ease of operation
If autonomous tuning is implemented using only local measurements, then system simplicity and ease of operation improve, but tuning precision may be limited without inter-device communication
Solution Approach 1:
The patent enables autonomous tuning where each device (transmitter or receiver) can independently adjust its own resonance frequency based solely on measurements taken from its local circuit parameters and coupling coefficient measurements. The system performs self-tuning without requiring external intervention or complex inter-device communication protocols, making it suitable for portable and wireless applications
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
These heuristics enable efficient power transfer by minimizing the frequency difference between resonant modes, enhancing the coupling coefficient and thus increasing the power transfer efficiency, even in systems with low initial coupling coefficients.
Implementation Method 1
Power transfer is increased when both the transmitter and receiver in a wireless power transfer system are operating at the same resonance frequency. The implementation of heuristics for tuning dual series resonance circuits, including iterative and single-pass methods, to match the self-resonant frequency of the primary and secondary coils
Implementation Method 2
The implementation of heuristics for tuning dual series resonance circuits, including iterative and single-pass methods, to match the self-resonant frequency of the primary and secondary coils, allowing for improved power transfer by adjusting circuit parameters such as capacitance to align resonance modes
Data Source
AI summary
One heuristic for tuning a wireless power transfer device includes monitoring a circuit parameter while sweeping a power source frequency; identifying two frequencies related to local maxima of the circuit parameter values; estimating self-resonant frequency of an electromagnetically coupled device based on the two frequencies; determining a value for a tuning component of the wireless power transfer device such that the device self-resonant frequency equals the estimated coupled device self-resonant frequency; and adjusting the tuning component to the determined value.Another tuning heuristic includes monitoring a circuit parameter while sweeping the power source frequency; identifying two frequencies related to two local maximum for the values of the circuit parameter; determining a desired resonance frequency for the wireless power transfer device based on stored information; and adjusting the tuning component to a value that causes the wireless power transfer device when uncoupled to operate at or near the desired resonance frequency.