Induction Heating Sensing Coil Layout for Eccentricity Detection
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Solution Overview
Problem
Existing induction heating devices struggle with inefficient space utilization and reduced heating efficiency due to the need for sensing coils placed around the heating coil to detect container eccentricity, leading to uneven cooking quality.
Innovation Solution
The induction heating device employs a plurality of sensing coils arranged circumferentially on the heating coil, with alternating winding directions to prevent magnetic field offset and detect eccentricity by analyzing resonance current changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing coils are placed around the heating coil to detect container eccentricity, then eccentricity detection capability is improved, but space utilization efficiency deteriorates
Solution Approach 1:
The sensing coils are merged with the heating coil structure by being placed on top of the heating coil rather than around it. This integration allows the sensing function to be achieved within the existing heating zone area, eliminating the need for additional space around the heating coil and thus resolving the contradiction between detection capability and space utilization.
2Area of stationary object
If sensing coils are placed on the heating coil to improve space utilization, then space utilization efficiency is improved, but magnetic field output may be offset causing heating efficiency to deteriorate
Solution Approach 1:
The sensing coils are segmented into multiple coils arranged in different directions on the heating coil. This segmentation allows selective activation of sensing coils based on the detected direction of container eccentricity, ensuring that only the necessary sensing coils operate during heating, thereby minimizing magnetic field interference and preserving heating efficiency while maintaining space utilization efficiency.
3Measurement precision
If multiple sensing coils are arranged circumferentially side by side to detect eccentricity direction, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Different sensing coils are positioned at different locations and orientations on the heating coil, with each coil having a specific sensing direction. This local quality approach allows the system to determine the direction of container eccentricity by comparing the outputs of differently oriented sensing coils, achieving precise directional detection without requiring a complex overall structure.
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 device efficiently detects and corrects container eccentricity, ensuring even heating and preventing magnetic field interference, thus maintaining cooking quality and optimizing device usability.
Implementation Method 1
a magnetic field is generated in a direction of the container and induces eddy current to the container, to heat the container
Implementation Method 2
a magnetic field is generated in a direction of the container and induces eddy current to the container
Implementation Method 3
based on a change in resonance current generated in each sensing coil, detect whether a container is eccentric
Data Source
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AI summary
Disclosed is an induction heating device. The disclosed induction heating device senses whether a container placed on a heating coil is off-center, and if so, the direction in which the container is off-center, on the basis of a change in the resonance current of a plurality of sensing coils disposed along the circumferential direction above the heating coil. Each of the plurality of sensing coils includes a plurality of first layer sensing coils and a plurality of second layer sensing coils. Each of the plurality of first layer sensing coils is electrically connected to a corresponding second layer sensing coil among the plurality of second layer sensing coils. The first layer sensing coil and the second layer sensing coil that are connected to each other are vertically misaligned and have opposite winding directions.