Wireless Power Resonator Impedance Matching via Distance Estimation
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies in impedance matching between source and target resonators, particularly in near-field wireless power transmission, which affects power transmission efficiency and reliability.
Innovation Solution
A wireless power transmission system that includes a source resonator, power supplies, switches, and a controller to estimate the distance and impedance between resonators, using an envelope detector, distance estimator, and impedance matcher to adjust the impedance of the source resonator based on the estimated distance and coupling coefficient, thereby optimizing power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If impedance matching is not performed in near-field wireless power transmission, then device complexity is reduced, but power transmission efficiency deteriorates
Solution Approach 1:
The system performs preliminary impedance matching before power transmission by estimating the distance between source and target resonators, then pre-adjusting the impedance of the source resonator to match the target impedance. This preliminary action ensures optimal power transfer efficiency is achieved before actual power transmission begins, eliminating the need for complex real-time impedance matching during operation.
Solution Approach 2:
The patent replaces complex mechanical or circuit-based impedance matching mechanisms with a distance-based estimation and calculation approach. By using the relationship between distance and impedance characteristics, the system substitutes physical impedance adjustment hardware with computational methods, thereby reducing device complexity while maintaining transmission efficiency.
2Loss of energy
If distance estimation and impedance matching are performed, then power transmission efficiency is improved, but measurement precision requirements increase
Solution Approach 1:
The system implements a feedback mechanism where the estimated distance between source and target resonators is continuously used to adjust the impedance matching parameters. The controller receives distance information, calculates the appropriate impedance values, and adjusts the source resonator accordingly, creating a closed-loop system that maintains optimal efficiency even with varying distances.
Solution Approach 2:
The patent changes the operating parameters of the source resonator based on the estimated distance. By dynamically adjusting impedance parameters according to distance variations, the system maintains optimal power transfer efficiency across different transmission distances without requiring extremely precise fixed measurements.
3Loss of energy
If real-time impedance matching is performed during power transmission, then power transmission efficiency is improved, but operation speed decreases
Solution Approach 1:
The system performs impedance matching as a preliminary action before power transmission begins, rather than continuously during transmission. The controller estimates the distance, calculates the required impedance values, and configures the source resonator in advance. This preliminary configuration allows full-power transmission to proceed without real-time adjustments, maintaining both high efficiency and fast transmission speed.
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 enhances power transmission efficiency by accurately matching impedance between resonators, improving power transfer efficiency and reliability in wireless power transmission.
Implementation Method 1
a source resonator configured to transmit wireless power by resonating with a target resonator
Implementation Method 2
an envelope detector configured to detect an envelope of the wireless power transmitted by the source resonator
Data Source
AI summary
A wireless power transmitter includes a source resonator configured to transmit wireless power by resonating with a target resonator, a first power supply configured to supply power to the source resonator, a first switch configured to turn ON/OFF a connection between of the source resonator to the first power supply, and a controller configured to match an impedance of the source resonator by estimating a distance between the source resonator and the target resonator.