Induction Power Supply Intruding Metal Detection
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Solution Overview
Problem
Existing induction type power supply systems face challenges in effectively detecting intruding metals during power transmission, leading to potential safety issues such as overheating or explosion, as current methods like power loss calculation are not satisfactory and may result in unnecessary power cuts due to noise interference.
Innovation Solution
A method that interrupts the driving signal of the induction type power supply system to stop driving the supplying-end coil, obtains first and second attenuation slopes during specific periods, and determines the presence of an intruding metal based on these slopes, using a processor and comparator modules to track peak voltage levels and calculate attenuation slopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power loss calculation method is used to detect intruding metal, then detection capability is improved, but false detection increases due to noise interference
Solution Approach 1:
The system performs preliminary actions by pre-setting multiple threshold values (first threshold, second threshold, third threshold) based on different noise conditions and metal sizes. Before actual detection, the system pre-calculates expected power loss ranges for various scenarios, enabling it to distinguish between noise-induced power fluctuations and genuine metal detection signals.
Solution Approach 2:
The invention changes detection parameters dynamically by using multiple threshold values instead of a single fixed threshold. The system adjusts which threshold to apply based on operating conditions, power loss magnitude, and detection history, thereby adapting to different noise environments and metal object characteristics to reduce false detections.
2Measurement precision
If strict threshold value is used for intruding metal determination, then detection sensitivity is improved, but unnecessary power cuts increase due to noise
Solution Approach 1:
The system employs multiple threshold values (first threshold for high sensitivity, second threshold for moderate sensitivity, third threshold for low sensitivity) instead of a single strict threshold. By selecting appropriate thresholds based on detection confidence and noise levels, the system maintains high sensitivity for genuine metal detection while avoiding unnecessary power cuts caused by noise-induced false positives.
Solution Approach 2:
The invention applies partial detection action by using a multi-level threshold approach where not all detection triggers result in immediate power cuts. The system first identifies potential metals using a lower threshold, then applies additional verification using higher thresholds before executing power cut, thereby reducing excessive reactions to noise while maintaining sensitivity to real threats.
3Measurement precision
If small intruding metal detection is improved, then safety coverage is enhanced, but detection reliability decreases due to noise interference
Solution Approach 1:
The system uses different threshold values optimized for detecting different sizes of metal objects. For small metals, a lower (more sensitive) threshold is applied, while for larger metals, a higher threshold is used. This parameter adaptation allows the system to detect small metals effectively without being overly sensitive to noise that would cause false detections.
Solution Approach 2:
The system performs preliminary analysis of power loss magnitude and patterns before making detection decisions. By pre-establishing threshold values and detection criteria for different metal sizes, the system can distinguish between noise-induced power fluctuations and genuine signals from small metals, thereby improving both detection capability and reliability for small objects.
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 enhances the detection of intruding metals, reducing false positives and negatives, thereby improving safety by accurately determining the presence of metals and preventing unnecessary power cuts, while maintaining system stability and efficiency.
Implementation Method 1
a driver circuit to drive a supplying-end coil to generate resonance, in order to send electromagnetic waves
Implementation Method 2
A coil of the power receiving terminal may receive the electromagnetic waves and perform power conversion to generate DC power
Implementation Method 3
The magnetic material close to the coil may enlarge the coil inductance, and thereby increase the electromagnetic induction capability
Implementation Method 4
The electromagnetic energy exerted on a metal may heat the metal. This principle is similar to an induction cooker
Implementation Method 5
obtaining a first attenuation slope during a first period when driving of the supplying-end coil is stopped, and obtaining a second attenuation slope during a second period
Data Source
AI summary
A method used for an induction type power supply system, for detecting whether an intruding metal exists in a power transmission range of the induction type power supply system, includes interrupting at least one driving signal of the induction type power supply system to stop driving a supplying-end coil of the induction type power supply system; obtaining a first attenuation slope during a first period when driving of the supplying-end coil is stopped, and obtaining a second attenuation slope during a second period when driving of the supplying-end coil is stopped; and determining whether the intruding metal exists in the power transmission range of the induction type power supply system according to the first attenuation slope and the second attenuation slope.