Cooking device
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Solution Overview
Problem
Existing cooking appliances with temperature sensors near induction heating elements face interference from electromagnetic fields, leading to inaccurate temperature measurements.
Innovation Solution
Incorporating a shielding element, primarily made of ferrites, to protect the sensor element from electromagnetic interference, ensuring accurate temperature detection by deflecting electromagnetic field lines and maintaining a high shielding effectiveness across various frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor element is arranged in the vicinity of the induction heating element to enable temperature detection, then the temperature measurement function is achieved, but the measurement accuracy deteriorates due to electromagnetic field interference
Solution Approach 1:
A shielding element is introduced as an intermediary component between the induction heating element and the sensor element. This shielding element deflects electromagnetic field lines away from the sensor element, preventing direct electromagnetic interference while allowing the sensor to remain in its functional position for temperature detection.
Solution Approach 2:
The housing unit is divided into distinct functional zones: a first region containing the induction heating element, a second region containing the sensor element, and a shielding element that creates an electromagnetic barrier between these regions. This spatial segmentation allows each component to perform its function without interfering with others.
2Productivity
If the sensor element is positioned close to the induction heating element for effective temperature monitoring, then the monitoring effectiveness is improved, but active current losses increase due to electromagnetic interference
Solution Approach 1:
The shielding element acts as a protective intermediary that reduces electromagnetic coupling between the induction heating element and sensor element. This minimizes parasitic current losses in the sensor element while maintaining close proximity for effective temperature monitoring.
3Strength
If the housing unit is made entirely of ceramic or aluminum for structural integrity, then the structural strength is maintained, but electromagnetic shielding effectiveness is reduced
Solution Approach 1:
The housing unit combines ceramic or aluminum structural components with a ferrite-based shielding element. This composite construction maintains the structural integrity provided by ceramic/aluminum while adding electromagnetic shielding capability through the ferrite material, which has superior magnetic properties for deflecting electromagnetic fields.
Solution Approach 2:
Instead of making the entire housing unit from electromagnetic shielding material, the shielding element is strategically placed only in the region where electromagnetic interference would affect the sensor element. This localized approach provides necessary shielding while minimizing the use of specialized materials and maintaining overall structural integrity.
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 significantly enhances measurement accuracy by preventing electromagnetic interference, allowing for precise temperature monitoring and reducing active current losses, thus optimizing the performance of the cooking appliance.
Implementation Method 1
at least one shielding element (16) which is intended to shield the sensor element (14) at least essentially against at least one electromagnetic field provided in particular by at least one induction heating element
Implementation Method 2
at least one induction heating element
Data Source
Figure 1~3
Figure 4~7
Figure 8~11
AI summary
In order to provide a generic device with improved properties in terms of high measurement accuracy, a cooking appliance device with at least one measuring unit (12a-d) is proposed, which has at least one sensor element (14a-d) and at least one shielding element (16a-d) which is provision is made to shield the sensor element (14a-d) at least essentially against at least one electromagnetic field.