Display system and operation for an inductive cooktop
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Solution Overview
Problem
Inductive cooktop systems face issues with induced voltage on clock lines causing incorrect pixel data in displays due to the magnetic fields generated by induction coils interfering with display electronics.
Innovation Solution
The inductive cooktop system incorporates an electrically actuated display panel with synchronized refresh rates to minimize induced voltage, using alternating or direct current power sources and strategically orienting induction coils to align electromagnetic fields with display lines, thereby reducing electrical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a display panel is incorporated near or overlapping the hot areas of the top panel, then the display can provide visual feedback closer to the cooking area, but the magnetic fields generated by the induction coils interfere with the operation of the display electronics
Solution Approach 1:
The display panel is extracted from the hot cooking area and positioned in a location less susceptible to magnetic field interference, while still maintaining visibility and accessibility for the user. This separates the display function from the high-interference induction coil zone.
Solution Approach 2:
The display refresh operation is performed in advance at specific timing moments (when AC voltage is zero or at peaks) before the magnetic field interference becomes problematic. This preliminary timing action prevents data corruption by completing critical display updates during windows of lower electromagnetic interference.
2Reliability
If the display refresh rate is increased to reduce flicker, then the display quality improves, but the induced voltage on clock lines increases causing incorrect pixel data
Solution Approach 1:
The display refresh is performed periodically at specific phases of the AC cycle (zero-crossing or peak moments) rather than continuously. This periodic synchronization reduces induced voltage on clock lines while maintaining adequate refresh rates for display stability.
Solution Approach 2:
The timing parameters of the display refresh are changed to align with specific phases of the AC voltage cycle. By adjusting when refresh occurs within each cycle (rather than changing refresh rate), induced voltage is reduced while maintaining display stability.
3Productivity
If the induction coil operates at higher power to improve heating efficiency, then the cooking performance improves, but the magnetic field interference with display electronics increases
Solution Approach 1:
Display refresh operations are performed in advance during low-interference windows (zero-crossing or peak moments) before high-power coil operation creates problematic magnetic fields. This allows high heating power to be used while protecting display data integrity.
Solution Approach 2:
The periodic nature of the AC power cycle, which creates intermittent magnetic field interference, is converted into a benefit by synchronizing display refresh with the natural low-interference moments (zero-crossing or peak points) of each cycle. The harmful periodic interference pattern becomes a useful timing reference.
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
This solution effectively minimizes induced voltage on display lines, ensuring accurate pixel data and preventing display malfunctions despite the presence of magnetic fields, enhancing the operational reliability of inductive cooktop systems.
Implementation Method 1
An induction coil is disposed below the electrically actuated display panel. The induction coil is operable to generate a time varying electromagnetic field that inductively couples with the cookware object supported at the transparent panel.
Implementation Method 2
It is known that inductive cooktops can be used to effectively heat metal cookware that is capable of inductive coupling with a time varying electromagnetic (EM) field generated by the cook top.
Implementation Method 3
The refresh rate is synchronized to the time varying electromagnetic field to minimize an induced voltage on one of the first and second set of lines.
Data Source
AI summary
An inductive cooktop includes a transparent panel arranged to support a cookware object, and an electrically actuated display panel disposed below the transparent panel. The display panel includes a first set of lines and a second set of lines disposed orthogonally and forming a 2D matrix arranged to operate picture elements at intersections of the first and second sets of lines, where each picture element is refreshed at a refresh rate. An induction coil is below the display panel to generate a time varying electromagnetic field that inductively couples with the cookware object supported at the transparent panel. A driver is in electronic communication with the induction coil for providing power to the induction coil. The refresh rate is synchronized to the time varying electromagnetic field to minimize an induced voltage on one of the first and second set of lines of the display panel.