Induction Cooktop Electrode Placement for Boiling Detection
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Solution Overview
Problem
Conventional induction cooking devices fail to accurately detect boiling-over due to the effects of the electric field generated by induction heating, leading to incorrect sensing of electrostatic capacity changes.
Innovation Solution
The induction cooking device incorporates electrodes disposed outside the outer circumference of the heating coil, with a thinner shape and arc-like configuration, and an electrostatic capacity detector to minimize the impact of induction heating effects, allowing for reliable detection of boiling-over by adjusting heating power based on changes in electrostatic capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrodes are disposed inside the heating coil area to detect boiling-over, then the detection sensitivity is improved, but the detected values vary due to effects of electric field generated by induction heating
Solution Approach 1:
The electrodes are extracted from the heating coil area and disposed outside the outer circumference of the heating coil. This separation removes the electrodes from the harmful electric field environment while maintaining their ability to detect boiling-over through capacitive coupling with the cooking container and food articles.
Solution Approach 2:
The top plate serves as an intermediary medium between the electrodes and the cooking container. The electrodes detect changes in electrostatic capacity through the top plate, which transmits the capacitive coupling signals from the cooking container and food articles without requiring direct contact or proximity to the heating coil.
2Stability of the object's composition
If electrodes are disposed outside the heating coil to avoid electric field effects, then the measurement stability is improved, but the detection sensitivity may be reduced
Solution Approach 1:
The detection function is merged with the top plate structure. The top plate is configured to enable capacitive coupling between the electrodes and the cooking container, effectively combining the electrode detection function with the structural component (top plate) to maintain sensitivity without compromising stability.
Solution Approach 2:
The system changes the detection parameter from direct electrical contact (which would be sensitive to electric field interference) to capacitive coupling through the top plate. This parameter change allows the electrodes to detect boiling-over through changes in electrostatic capacity while remaining stable outside the heating coil's electric field.
3Reliability
If multiple electrodes with different areas are used to improve detection coverage, then the detection reliability is improved, but the wiring complexity increases
Solution Approach 1:
The top plate serves multiple functions: it provides structural support, enables capacitive coupling for detection, and acts as a signal transmission medium. This multi-functionality reduces the need for separate wiring configurations for each electrode, as the top plate itself facilitates the electrical connection path.
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 configuration enables more accurate detection of boiling-over, reducing the influence of induction heating on electrostatic capacity measurements, thereby preventing spills and maintaining cooking performance.
Implementation Method 1
a heating coil for generating an induction magnetic field for heating the cooking container
Implementation Method 2
an electrostatic capacity detector for detecting changes in electrostatic capacity occurring in the electrodes when articles to be cooked contact with the top plate
Data Source
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AI summary
Disclosed is an induction cooking device that is not likely to be affected by induction heating and wherein boiling-over can be detected. An induction cooking device has: a top plate on which a cooking container is placed; a heating coil that generates an induction magnetic field for heating the cooking container; a heating control unit that controls the heating power of the cooking container by controlling the high-frequency current supplied to the heating coil; electrodes disposed in a lower surface of the top plate; and an electrostatic capacity detector that detects changes in electrostatic capacity occurring in the electrodes when articles to be cooked contact with the top plate. When the electrostatic capacity detector senses changes in the electrostatic capacity of the electrodes, the heating control unit decreases or stops the heating power of the cooking container, and the electrodes are disposed outside of the outer circumference the heating coil.