Induction Power Supply Metal Detection
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Solution Overview
Problem
Induction type power supply systems face safety issues due to the risk of heating and damaging surrounding objects when an intruding metal is detected during power delivery, as existing methods interrupt power periodically but fail to effectively prevent metal heating before power starts.
Innovation Solution
A method for detecting intruding metals before power delivery begins, using a supplying-end module with a processor, signal receiver, and power driver to generate detection signals, compare peak coil signal values with threshold voltages, and determine the resonant frequency to prevent power activation when metal is present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If periodic interruption of power delivery is used to detect intruding metal, then metal detection capability is improved, but metal heating and damage risk increases due to repeated heating cycles
Solution Approach 1:
The patent performs intruding metal detection before power delivery is activated by using the supplying-end coil to generate a detection signal that induces current in the coil. The system compares the induced current with a reference value to determine if metal is present, and only activates power delivery if no metal is detected. This preliminary detection prevents metal heating from occurring in the first place, rather than periodically interrupting power delivery to detect metal.
Solution Approach 2:
The patent applies preliminary anti-action by preventing power delivery activation when intruding metal is detected before power starts. The detection mechanism uses the supplying-end coil to generate a signal that would induce current in metal objects, and by comparing this induced current with a reference value, the system determines metal presence and blocks power activation accordingly. This preemptive measure counteracts the potential harmful heating effect before it can occur.
2Productivity
If power delivery is activated without pre-detection, then productivity is improved, but safety deteriorates due to risk of metal heating and damage
Solution Approach 1:
The patent implements a preliminary detection step before power delivery activation. The supplying-end coil generates a detection signal that induces current in any nearby metal objects. The system compares the induced current with a reference value to determine metal presence. Only when no metal is detected does the system activate power delivery, ensuring safety without significantly impacting productivity.
3Measurement precision
If detection signal is generated using supplying-end coil, then detection precision is improved, but energy consumption increases
Solution Approach 1:
The patent makes the supplying-end coil multi-functional by using it for both power delivery and detection purposes. The same coil that delivers power to the receiving-end device is also used to generate the detection signal for intruding metal detection. This eliminates the need for a separate detection coil, reducing overall system energy consumption while maintaining detection precision through the use of the high-power supplying-end coil.
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
Effectively prevents power delivery to intruding metals, enhancing safety by determining their presence before power initiation, thus avoiding prolonged heating and potential damage.
Implementation Method 1
periodically generating a detection signal on a first driving signal and a second driving signal, wherein the detection signal controls the supplying-end coil to resonate and generate a coil signal
Implementation Method 2
If the electromagnetic energy sent by the supplying-end coil is exerted on a metal, it may heat the metal
Implementation Method 3
The accumulated heat energies may cause high temperature on the metal
Data Source
AI summary
The present invention discloses an intruding metal detection method for a supplying-end module of an induction type power supply system having a supplying-end coil controlled by a first driving signal and a second driving signal. The method includes periodically generating a detection signal on the first driving signal and the second driving signal, wherein the detection signal controls the supplying-end coil to resonate and generate a coil signal; setting at least one threshold voltage and comparing a plurality of peak values of the coil signal with the at least one threshold voltage, respectively, to generate a plurality of trigger signals; determining whether to perform a pre-charging procedure according to a resonant frequency of the coil signal; and determining whether there is an intruding metal existing in a power supply range of the induction type power supply system according to the plurality of trigger signals and the resonant frequency.