Coil Misalignment Detection Using Symmetric Temperature Sensing
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Solution Overview
Problem
Wireless power supply devices face challenges in reliably detecting coil misalignment due to environmental factors like dust and dirt, which affect the accuracy of image processing-based methods.
Innovation Solution
A misalignment detection device using induction heating units and temperature measurement units to detect coil misalignment by evaluating the difference in temperatures generated by lines of magnetic force, independent of the surrounding environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image processing-based misalignment detection is used, then misalignment detection can be implemented, but detection reliability deteriorates due to environmental factors like dust and dirt
Solution Approach 1:
The patent replaces image processing-based detection with a magnetic field-based detection system. Induction heating units generate magnetic fields that interact with the coil, and temperature changes are measured to detect misalignment. This substitution of optical detection with magnetic/thermal detection eliminates sensitivity to visual environmental factors like dust and dirt, thereby improving reliability while maintaining measurement precision.
Solution Approach 2:
The patent introduces temperature measurement as an intermediary parameter to detect misalignment. Instead of directly observing coil position through image processing, the system measures temperature changes in induction heating units caused by misalignment-induced magnetic field variations. This intermediary measurement approach provides a more reliable indicator that is not affected by outdoor environmental conditions.
2Loss of information
If image processing is used for misalignment detection, then positional information can be obtained, but the system becomes sensitive to environmental noise
Solution Approach 1:
The patent substitutes optical information acquisition with magnetic field interaction measurement. Induction heating units generate magnetic fields that couple with the coil, and misalignment is detected through temperature changes in these units. This replacement eliminates sensitivity to environmental visual noise while preserving accurate positional information about coil alignment.
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
Enables reliable and environment-independent positional misalignment detection, improving the accuracy and robustness of wireless power supply systems.
Implementation Method 1
a first induction heating unit and a second induction heating unit which receive lines of magnetic force generated by the first coil
Implementation Method 2
a first induction heating unit and a second induction heating unit which receive lines of magnetic force generated by the first coil and are juxtaposed line-symmetrically
Implementation Method 3
a first temperature measurement unit which is disposed adjacent to the first induction heating unit and outputs a first temperature; a second temperature measurement unit which is disposed adjacent to the second induction heating unit and outputs a second temperature
Data Source
AI summary
This misalignment detection device is provided with: a plurality of coils which receive lines of magnetic force generated by a power transmitting coil and are disposed side by side line-symmetrically with respect to an axis line as a symmetrical axis; a plurality of temperature sensors which are disposed adjacent to each of the plurality of coils and output temperatures; and a processing device for detecting misalignment of a power receiving coil with respect to the power transmitting coil along the axis line on the basis of a difference for evaluating a difference between the temperatures. With this misalignment detection device, it is possible to perform positional misalignment detection which is not easily affected by surroundings.