Removable Knob Switch Resonance Sensing for Precise IH Power Control
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Solution Overview
Problem
Induction heating devices using capacitive touch-type knob switches face increased manufacturing costs and decreased efficiency due to the need for multiple touch sensors to sense rotation, leading to potential operational errors and inaccurate thermal power adjustments.
Innovation Solution
An induction heating device that adjusts thermal power using a frequency pulse based on the resonance characteristic between a knob switch and a resonance detecting unit, which varies with the rotation degree of the knob switch, incorporating a first and second magnetic material and capacitors to output a frequency pulse corresponding to an impedance inflection point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive touch-type knob switches with multiple touch sensors are used to sense rotation, then the induction heating device can detect rotation degree, but manufacturing costs increase and manufacturing efficiency decreases
Solution Approach 1:
The patent replaces the capacitive touch sensor system with a magnetic field-based detection system. A magnet is attached to the knob, and a magnetic sensor detects the magnet's position to determine rotation degree. This substitution eliminates the need for multiple touch sensors and their complex control logic, thereby reducing manufacturing costs and improving manufacturing efficiency while maintaining accurate rotation detection capability.
Solution Approach 2:
The patent changes the detection parameter from capacitive touch signals to magnetic field signals. By using a magnet and magnetic sensor, the system detects rotation through changes in magnetic field position rather than through multiple touch sensor readings. This parameter change simplifies the detection mechanism and reduces manufacturing complexity.
2Measurement precision
If multiple touch sensors are used to sense knob rotation, then rotation degree can be detected, but the device complexity increases
Solution Approach 1:
The patent replaces the complex multi-sensor capacitive touch system with a simple magnet and magnetic sensor arrangement. The magnet attached to the knob creates a magnetic field that the magnetic sensor detects, providing rotation information through a single sensor instead of multiple touch sensors. This significantly reduces device complexity.
Solution Approach 2:
The magnetic sensor serves multiple functions: detecting the magnet's presence, determining rotation degree, and identifying knob position. This multi-functionality eliminates the need for separate touch sensors and control logic for each detection task, thereby reducing overall device complexity.
3Ease of operation
If multiple touch sensors are used for rotation sensing, then thermal power adjustment can be controlled, but operational errors and inaccurate adjustments may occur
Solution Approach 1:
The patent replaces the capacitive touch sensor system with a magnetic field-based detection system. A magnet is attached to the knob, and a magnetic sensor detects the magnet's position to determine rotation degree. This substitution eliminates the need for multiple touch sensors and their complex control logic, thereby reducing manufacturing costs and improving manufacturing efficiency while maintaining accurate rotation detection capability.
4Adaptability or versatility
If a detachable knob switch is provided on the induction device, then the device can be adjusted for different cooking areas, but the knob switch may become detached or lost
Solution Approach 1:
The patent replaces the mechanical attachment system with a magnetic attachment system. A magnet is embedded in the knob switch, and it magnetically attaches to a corresponding magnetic material in the device body. This magnetic attachment provides secure fixation while allowing easy attachment and detachment, maintaining versatility while improving reliability and preventing loss.
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 reduces manufacturing costs, simplifies the manufacturing process, and enhances the accuracy of thermal power adjustments by using a frequency pulse to control the heating coil, ensuring precise power control.
Implementation Method 1
a resonance detecting unit configured to output a frequency pulse based on a resonance characteristic between the resonance detecting unit and the knob switch
Implementation Method 2
the first magnetic material 16 has a polarity opposite to a polarity of a second magnetic material disposed in the lower portion of the knob area, and the first magnetic material 16 can be attached to the knob area using an attractive force between the first magnetic material 16 and the second magnetic material
Implementation Method 3
The induction device denotes a cooking device that performs heating using an induction heating method
Data Source
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AI summary
The present disclosure relates to an induction heating device comprising: a heating coil provided in a main body; a knob switch, detachable from and attachable to a knob area formed on one surface of the main body, for adjusting a heating power of the heating coil by rotation when attached to the knob area; a resonance detecting unit for outputting a frequency pulse corresponding to an impedance inflection point that varies according to a degree of rotation of the knob switch; and a controller for controlling the heating power of the heating coil according to the frequency pulse.