Wireless Power Transmission Device Resonance Frequency Deviation Detection
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Solution Overview
Problem
Magnetic resonance type wireless power feeding systems face challenges in accurately detecting foreign substances and determining their impact on power transmission efficiency, leading to potential heat generation and reduced reliability due to frequency-dependent absorption and varying detection methods.
Innovation Solution
A power transmission device that adjusts its resonance frequency to match the transmission frequency and detects deviations to determine the type and influence of foreign substances, controlling power transmission based on the direction and extent of frequency deviation to prevent damage and optimize efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If magnetic resonance type wireless power feeding system is used to increase transmission distance and reduce positional deviation sensitivity, then power transmission efficiency is improved, but foreign substance absorption increases causing heat generation and reliability reduction
Solution Approach 1:
The system performs preliminary detection of foreign substances by monitoring resonance frequency deviations before power transmission begins or during transmission. By detecting the presence and type of foreign substances in advance, the system can prevent heat generation and damage, thereby maintaining both power transmission efficiency and reliability
Solution Approach 2:
The system continuously monitors the resonance frequency of the magnetic resonance circuit during power transmission and uses this feedback to detect foreign substances. When frequency deviations indicate foreign substance presence, the system adjusts or stops power transmission to prevent reliability degradation while maintaining efficient operation under normal conditions
2Loss of energy
If resonance frequency is adjusted to match transmission frequency for optimal power transfer, then power transmission efficiency is improved, but detection accuracy of foreign substances is reduced due to frequency masking
Solution Approach 1:
The system dynamically adjusts the resonance frequency of the magnetic resonance circuit during operation. By temporarily deviating from the matched transmission frequency during detection phases and returning to the matched frequency during power transmission phases, the system achieves both accurate foreign substance detection and efficient power transfer
Solution Approach 2:
The system periodically switches between detection mode and transmission mode. During detection mode, the resonance frequency is adjusted to detect foreign substances; during transmission mode, the frequency is matched for optimal power transfer. This periodic switching enables both functions without permanent compromise
3Ease of operation
If detection methods are simplified to reduce system complexity, then ease of operation is improved, but detection precision of foreign substance type and influence is reduced
Solution Approach 1:
The system uses the existing magnetic resonance circuit's own resonance frequency characteristics as the detection mechanism. By monitoring frequency deviations in the circuit that is already being used for power transmission, the system achieves foreign substance detection without requiring separate complex detection hardware, thereby maintaining operational simplicity while improving detection accuracy
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
Enhances the reliability of wireless power transmission by accurately identifying foreign substances and controlling power transmission to prevent heat generation and maintain efficiency, particularly for IC cards and metals with varying surface areas.
Implementation Method 1
a power transmission device which transmits power in a wireless manner through electromagnetic field resonance coupling using a resonance circuit
Implementation Method 2
In a case where a resonance frequency of the resonance circuit which is set to be the same as a frequency of a power transmission signal which is output as transmission power is deviated during transmission of the power, the power transmission device detects a direction in which the resonance frequency is deviated
Data Source
AI summary
The present power transmission device performs a power transmission process for transmitting power in a wireless manner through electromagnetic field resonance coupling using a resonance circuit. In a case where a resonance frequency of the resonance circuit set to be the same as a frequency of a power transmission signal which is output as transmission power is deviated during transmission of the power, the present power transmission device detects a direction in which the resonance frequency is deviated and controls the power transmission process on the basis of a detection result thereof. Consequently, it is possible to determine not only whether or not a foreign substance is present in a power transmission region but also determines whether or not the foreign substance influences wireless power transmission with high accuracy, and thus reliability of the wireless power transmission system can be improved.