Decentered Sensor Induction Heating for Temperature Accuracy
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Solution Overview
Problem
Conventional induction heating devices suffer from reduced thermal responsiveness and temperature sensing accuracy when the to-be-heated object is not placed directly above the sensor, leading to potential overheating and deformation of objects like empty pans.
Innovation Solution
The induction heating device features a sensor positioned decentered from the center of the heating coil, allowing for non-contact temperature sensing of the to-be-heated object's higher temperature areas, with a display unit on the top plate to guide users in placing the object correctly above the sensor, enhancing measurement accuracy and preventing abnormal heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the sensor is placed at the center of the heating coil to improve uniform heating and prevent excessive temperature increase, then thermal responsiveness and temperature sensing accuracy deteriorate when the to-be-heated object is not placed directly above the sensor
Solution Approach 1:
The patent applies asymmetry by deliberately positioning the sensor off-center relative to the heating coil. Specifically, the sensor is placed at a position that is decentered from the center of the heating coil in a direction vertical to the front side, creating an asymmetric configuration that optimizes temperature sensing accuracy while maintaining uniform heating performance.
2Measurement precision
If the sensor is positioned to sense higher temperature areas of the to-be-heated object, then temperature sensing accuracy improves, but the user may not be able to visually recognize the sensor position and place the object correctly
Solution Approach 1:
The patent uses visual indication (display) to show the sensor position on the top plate. The display unit presents the decentered sensor position in an easy-to-understand manner, using visual cues such as color or light indicators to guide users in placing the to-be-heated object at the appropriate position above the sensor.
3Ease of manufacture
If the sensor is placed at the center of the heating coil, then the configuration is simple and manufacturing is easier, but thermal responsiveness deteriorates when the object is not properly positioned
Solution Approach 1:
The patent implements an asymmetric sensor placement that is decentered from the heating coil center. This asymmetric configuration enhances thermal responsiveness by positioning the sensor to detect temperature changes more effectively, while the manufacturing complexity remains manageable due to the straightforward implementation of the decentered position.
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 improves temperature sensing accuracy, prevents overheating, and ensures user-friendly operation by visually indicating the sensor's position, thus securely placing the object above the sensor for precise temperature control.
Implementation Method 1
heating coil 204 for induction-heating to-be-heated object 202
Implementation Method 2
heating coil 204 for induction-heating to-be-heated object 202
Implementation Method 3
Sensor 205 is pressure-welded to a back face of top plate 203 corresponding to a lower part of to-be-heated object 202
Implementation Method 4
Sensors 205 are a heat sensitive element such as a thermistor
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3
AI summary
An induction heating device is provided that can realize an accrete sensing of the temperature of a to-be-heated object and that is user-friendly. To realize this, the induction heating device includes a sensor for sensing the temperature of the to-be-heated object and can carry out a heating operation only when it is determined that the to-be-heated object exists above the sensor. A display having a circular design and characters for example that shows the position of this sensor is provided on a top plate of the induction heating device.