Induction Cooktop Thin Film Structure for Mixed Cookware Heating
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Solution Overview
Problem
Induction heating cooktops face a limitation in heating efficiency when both magnetic and nonmagnetic materials are used, as the magnetic field generated by the working coil is not effectively transferred to nonmagnetic materials.
Innovation Solution
The cooktop includes a thin film with a skin depth thicker than its thickness, forming a closed loop that enhances the magnetic field application to both magnetic and nonmagnetic materials, allowing for efficient heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a thin film is added to enable heating of nonmagnetic materials, then heating capability is improved, but heating efficiency for magnetic materials decreases
Solution Approach 1:
The thin film is designed with non-uniform thickness, being thicker at the periphery and thinner at the center. This local quality variation allows the film to have different effects in different regions: at the center where magnetic materials are heated, the thinner portion minimizes eddy current interference and maintains heating efficiency, while at the periphery where nonmagnetic materials are heated, the thicker portion provides sufficient eddy current generation for effective heating.
2Adaptability or versatility
If the thin film thickness is increased to improve nonmagnetic material heating, then heating capability is improved, but magnetic field penetration is reduced
Solution Approach 1:
The thin film is designed with non-uniform thickness, being thicker at the periphery and thinner at the center. This local quality variation allows the film to have different effects in different regions: at the center where magnetic materials are heated, the thinner portion minimizes eddy current interference and maintains heating efficiency, while at the periphery where nonmagnetic materials are heated, the thicker portion provides sufficient eddy current generation for effective heating.
3Adaptability or versatility
If a closed loop structure is formed in the thin film, then nonmagnetic material heating is enabled, but magnetic field coupling with working coil increases
Solution Approach 1:
The thin film is designed with non-uniform thickness, being thicker at the periphery and thinner at the center. This local quality variation allows the film to have different effects in different regions: at the center where magnetic materials are heated, the thinner portion minimizes eddy current interference and maintains heating efficiency, while at the periphery where nonmagnetic materials are heated, the thicker portion provides sufficient eddy current generation for effective heating.
Solution Approach 2:
Instead of modifying the horizontal geometry of the closed loop, the invention changes the vertical dimension by varying the film thickness. This dimensional change allows the film to provide sufficient eddy current path for nonmagnetic material heating while minimizing the overall magnetic field coupling through the varying thickness profile.
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 solution enables efficient heating of both magnetic and nonmagnetic materials using the same heating source, minimizing the decrease in heating efficiency and improving usability and cost-effectiveness.
Implementation Method 1
a thin film to which an eddy current is applied so that the nonmagnetic material is heated
Implementation Method 2
the induction heating method generates an eddy current in the object to be heated consisting of a metal component using a magnetic field generated around the coil
Implementation Method 3
the magnetic field generated by the working coil may pass through the thin film and heat the magnetic material by applying an eddy current to the magnetic material
Implementation Method 4
the induction heating method generates an eddy current in the object to be heated consisting of a metal component using a magnetic field generated around the coil to heat the object to be heated itself
Data Source
AI summary
The present disclosure relates to an induction heating type cooktop and includes a case; a cover plate configured to be coupled to the upper end of the case and provided with an upper plate portion on which an object to be heated is disposed; a working coil provided inside the case; a thin film configured to be coated on the upper plate portion and to be inductively heated by the working coil; and an adiabatic material provided between the upper plate portion and the working coil, in which the thin film may be formed to have at least one closed loop that does not include a central region of the working coil.