Induction Heating Infrared Sensor Cooling and Shielding
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Solution Overview
Problem
Conventional induction heating cooking apparatuses with infrared sensors face complexities in assembly and cooling due to the placement of magnetic flux-shielding casings and partition plates, leading to inefficient temperature detection and increased component interference.
Innovation Solution
The apparatus positions the infrared sensor below a magnetic flux-shielding plate interposed between the ferrite materials and the control circuit, with cooling air conveyed along the lower surface of this plate to efficiently cool both components, reducing assembly complexity and enhancing temperature detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the infrared sensor is encircled by a magnetic flux-shielding casing and a partition plate is interposed between the infrared sensor and control circuit, then the magnetic flux influence on the infrared sensor is reduced, but the assembly complexity and wiring complexity increase
Solution Approach 1:
The patent removes the magnetic flux-shielding casing that encircled the infrared sensor and eliminates the partition plate between the infrared sensor and control circuit. Instead, a single magnetic flux-shielding plate is positioned between the heating coil and the infrared sensor, simplifying the structure while maintaining magnetic shielding effectiveness. This extraction of unnecessary components directly reduces assembly and wiring complexity.
Solution Approach 2:
The patent combines the magnetic flux-shielding function with the structural support function by integrating the magnetic flux-shielding plate into the existing structural framework. The magnetic flux-shielding plate serves both to shield the infrared sensor from magnetic flux and to provide a mounting surface for the infrared sensor, eliminating the need for separate shielding casings and partition plates.
2Temperature
If part of cooling air passes through the vent hole to cool the infrared sensor, then the infrared sensor temperature is controlled, but the cooling efficiency is insufficient and temperature detection accuracy deteriorates
Solution Approach 1:
The patent segments the cooling air flow into two distinct paths: one path directs cooling air to cool the control circuit components (IGBT, resonance capacitor), and another path directs cooling air through the magnetic flux-shielding plate to cool the infrared sensor. This segmentation ensures adequate cooling for both components without compromising temperature detection accuracy.
Solution Approach 2:
The magnetic flux-shielding plate serves as an intermediary for cooling air flow. Cooling air passes through the magnetic flux-shielding plate, which mediates the heat transfer from the infrared sensor to the cooling air, effectively cooling the infrared sensor while maintaining temperature detection accuracy. The plate's thin structure allows efficient heat transfer while providing necessary magnetic shielding.
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 simplifies assembly, reduces electromagnetic field influence on the infrared sensor, and ensures accurate temperature detection by improving cooling efficiency and minimizing temperature rise.
Implementation Method 1
an infrared sensor for receiving infrared rays emitted from the cooking container on the top plate and outputting a detection signal depending on the amount of light received
Implementation Method 2
a heating coil disposed below a location where the cooking container is placed
Implementation Method 3
a heating coil 4 disposed below the top plate 3 to induction heat the cooking container 2
Implementation Method 4
A plurality of ferromagnetic ferrite materials 5 having a magnetic flux-collecting effect are disposed below the heating coil 4
Implementation Method 5
a magnetic flux-shielding plate interposed between the ferrite materials and the control circuit
Implementation Method 6
a fan operable to convey cooling air to cool the control circuit
Implementation Method 7
cooling air is conveyed toward the infrared sensor along a lower surface of this plate to efficiently cool both components
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An induction heating cooking apparatus includes a magnetic flux-shielding plate 28 to restrain magnetic flux leakage from a heating coil 24 and define a cooling air trunk 33, through which cooling air from a fan 32 passes. An infrared sensor 26 for detecting infrared rays emitted from a cooking container 22 and a control circuit 27 for controlling an output of a heating coil 24 depending on an output from the infrared sensor 26 are accommodated within the same space with respect to the magnetic flux-shielding plate 28 to thereby enhance assemblage. Also, the infrared sensor 26 is mainly cooled by cooling air passing through a cooling air trunk 33 to thereby enhance the cooling efficiency of the infrared sensor 26 and conduct correct temperature detection.