Electric Range Filter Circuit Placement for Coil Noise and Heat
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Induction heating devices suffer from noise interference with other electronic devices due to the magnetic field generated by the working coil, and the filter circuit's noise reduction effectiveness decreases with increasing temperature, especially when positioned below high-power coils.
Innovation Solution
The induction heating device is designed with the filter circuit positioned below low-power working coils, maximizing the distance from high-power coils, and an air blowing fan supplies cooled air to the filter circuit to maintain optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the filter circuit is disposed below the working coil to save space, then the device structure is compact, but the temperature of the filter circuit increases and noise reduction effectiveness decreases
Solution Approach 1:
The patent divides the heating function into multiple working coils with different power levels (high-power coil and low-power coil). The filter circuit is specifically positioned below the low-power coil rather than the high-power coil, segmenting the thermal and electromagnetic environment to protect the filter while maintaining compact overall structure.
Solution Approach 2:
The patent applies local quality by creating different environmental conditions for different components. The filter circuit is placed in a location (below the low-power coil) with lower temperature and weaker magnetic field intensity, while the high-power coil operates in its own zone. This local differentiation allows the filter to function effectively without requiring a completely separate location.
2Area of stationary object
If the filter circuit is positioned close to the working coil for compact design, then installation space is optimized, but the magnetic field interference with the filter circuit increases
Solution Approach 1:
The patent segments the electromagnetic environment by using multiple working coils with different power outputs. The filter circuit is positioned in the electromagnetic zone of the low-power coil, which has significantly weaker magnetic field intensity compared to the high-power coil, thereby reducing magnetic field interference while maintaining compact installation.
Solution Approach 2:
The low-power working coil acts as an intermediary element between the high-power coil and the filter circuit. It creates a transition zone with moderate electromagnetic conditions, allowing the filter circuit to be positioned closer to the heating elements without being directly exposed to the intense magnetic field of the high-power coil.
3Device complexity
If the filter circuit is disposed at the center of the case below the working coil, then the structure is simplified, but the temperature increase reduces filtering performance
Solution Approach 1:
The patent simplifies the structure by maintaining a centralized filter circuit position, but segments the heating elements into high-power and low-power coils. This allows the filter to remain in a convenient central location while being positioned under the low-power coil, which provides a cooler, lower-interference environment without requiring complex redistribution of components.
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 effectively reduces noise interference and maintains the filter circuit's performance by keeping it at a lower temperature, thereby optimizing electromagnetic compatibility.
Implementation Method 1
an air blowing fan supplies cooled air to the filter circuit to maintain optimal performance
Implementation Method 2
high-frequency power is supplied to a coil to generate a magnetic field around the coil, and eddy current produced in the generated magnetic field is used to heat an object to be heated made of a metallic material
Implementation Method 3
eddy current produced in the generated magnetic field is used to heat an object to be heated
Data Source
AI summary
An electric range is provided, in which filter circuits are disposed at an edge of a lower end of a case and are spaced a maximum distance apart from a plurality of working coils, thereby reducing noise generated by the working coils as much as possible and improving performance of the filter circuits.