Wireless Power Detection Coils for Small Metal Foreign Matter
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Solution Overview
Problem
Existing methods for detecting foreign matters in high-power wireless power transmission systems require additional devices like cameras or thermal imaging, making them unsuitable for portable applications, and there is a need for a more efficient and accurate method to detect small metal foreign matters.
Innovation Solution
A method and device utilizing a wireless power transmission system with a transmitting detection coil and a receiving detection coil, where the mutual inductance of the transmitting detection coil is greater than that of the transmitting work coil, allowing for reduced transmitting power and improved transmission efficiency, enabling sensitive detection of small metal foreign matters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional devices like cameras or thermal imaging are used to detect foreign matters, then detection capability is improved, but device complexity increases and portability is reduced
Solution Approach 1:
The transmitting coil serves dual functions: it transmits wireless power and simultaneously detects foreign matters by monitoring changes in transmitting power. This eliminates the need for separate detection devices, resolving the contradiction between detection accuracy and device complexity
Solution Approach 2:
The system performs self-detection by using its own transmitting coil to sense foreign matters through power consumption changes. The transmitting coil monitors the difference between expected and actual transmitting power to identify foreign objects, making the system self-sufficient without external detection equipment
2Power
If high-power transmission is used, then power transmission efficiency is improved, but the ability to detect small metal foreign matters deteriorates
Solution Approach 1:
The system dynamically adjusts transmitting power based on detection needs. It switches between high power for efficient transmission and low power for sensitive foreign matter detection, optimizing both power transmission capability and detection accuracy at different operational phases
Solution Approach 2:
The system periodically performs foreign matter detection by temporarily reducing transmitting power to a lower level where small metal objects have more noticeable effects on power consumption. This periodic low-power detection phase allows accurate detection while maintaining high-power transmission capability for the majority of operation time
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 method enhances the accuracy of foreign matter detection by amplifying the influence of metal foreign matters on receiving power, effectively detecting small metal foreign matters in high-power wireless power transmission scenarios.
Implementation Method 1
controlling the transmitting detection coil of the transmitting end to send electric energy to the receiving end
Implementation Method 2
The receiving end includes a receiving detection coil and a receiving work coil, and a mutual inductance corresponding to the receiving detection coil is greater than a mutual inductance corresponding to the receiving work coil
Implementation Method 3
obtaining a result of a foreign matter detection based on the transmitting power and the receiving power
Data Source
AI summary
A method and device for detecting a foreign matter for a wireless power transmission system, a household appliance and an air conditioning system are provided. The wireless power transmission system includes a transmitting end and a receiving end. The receiving end includes a receiving detection coil and a receiving work coil, and a mutual inductance corresponding to the receiving detection coil is greater than a mutual inductance corresponding to the receiving work coil. The method includes: controlling the transmitting detection coil of the transmitting end to send an electric energy to the receiving end and obtaining a transmitting power of the transmitting end; obtaining a receiving power when the receiving end receives the electric energy transmitted by the transmitting end; obtaining a result of a foreign matter detection based on the transmitting power and the receiving power.