Inductive Cooktop Coil Layout for Display Heat and EMI Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inductive cooktops face challenges in safely indicating hot surfaces and integrating displays due to heat interference and magnetic field interference with display electronics.
Innovation Solution
An inductive cooktop design with induction coils generating electromagnetic fields parallel to display panel lines, using C-core or E-core coils and a thermal gap to prevent heat transfer, and a controller to manage electromagnetic field intensity and presence of cookware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a display panel is disposed between the top plate and induction coil, then user information display is improved, but electromagnetic interference with display lines occurs
Solution Approach 1:
The patent changes the orientation parameter of the induction coil to align the magnetic flux direction parallel to the data lines of the display panel. This parameter change prevents perpendicular intersection between magnetic field lines and data lines, thereby eliminating electromagnetic induction voltage that causes interference with display signals.
Solution Approach 2:
The patent introduces asymmetric positioning of the induction coil relative to the display panel, specifically orienting the coil such that its magnetic flux direction is not perpendicular but parallel to the data lines. This asymmetric arrangement breaks the symmetry that would otherwise cause maximum electromagnetic coupling and interference.
2Ease of operation
If the display panel is positioned close to the heating area, then user interaction is improved, but heat transfer to the display panel occurs
Solution Approach 1:
The patent introduces a thermal gap as an intermediary layer between the induction coil/heating area and the display panel. This thermal gap acts as a thermal insulator that mediates heat transfer, allowing the display to be positioned close to the heating area for user interaction while preventing excessive heat from reaching the display panel.
3Loss of information
If lights or small display screens are used to indicate hot surfaces, then safety indication is provided, but the indication is difficult to recognize and located away from hot area
Solution Approach 1:
The patent merges the display panel with the cooktop surface by positioning it between the top plate and induction coil, allowing the display to be located directly at the hot area rather than separately at the front edge. This merging enables the display to show hot area information directly at the relevant location, improving detectability and recognition.
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 safe and interference-free operation of displays on inductive cooktops by minimizing heat transfer and electromagnetic interference, allowing for user-friendly interaction and control.
Implementation Method 1
an induction coil operable to generate an electromagnetic field that inductively couples with a cookware object
Implementation Method 2
induction coils operable to generate an electromagnetic field that inductively couples with the cookware object supported at the transparent panel
Implementation Method 3
The induction coils are disposed below the display panel with a thermal gap between the induction coils and the display panel
Implementation Method 4
The induction coils are operable to generate an electromagnetic field with a flux direction in general parallel alignment with one set of lines, such as the data lines, to prevent the electromagnetic field from inducing a voltage on the lines
Data Source
AI summary
An inductive cooktop includes a transparent panel that supports a cookware object. An electrically actuated panel, such as a display panel, is disposed below the transparent panel. The electrically actuated panel includes two sets of lines, such as data and scan lines, disposed orthogonal to each other to form a two-dimensional matrix that is configured to operate associated elements with an addressing scheme. An array of induction coils are disposed below the electrically actuated panel that are each operable to generate an electromagnetic field that inductively couples with the cookware object supported at the transparent panel. The induction coils are operable to generate an electromagnetic field with a flux direction in general parallel alignment with one set of lines, such as the data lines, to prevent the electromagnetic field from inducing a voltage on the lines.