Electric Range Filter Circuit Layout for Coil Noise Reduction
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Solution Overview
Problem
Existing electric ranges with induction heating devices face challenges in efficiently reducing noise caused by magnetic fields and optimizing electromagnetic compatibility, particularly due to the placement and temperature effects on filter circuits.
Innovation Solution
The electric range design includes a configuration with multiple working coils, where a high-power working coil and low-power working coils are strategically positioned, along with a filter circuit placed at the lower end of the case, away from the high-power coil, and connected to a power feeder with an electric wire that minimizes magnetic field influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the filter circuit is disposed at the center of the case below the working coil, then the structure is compact, but the noise generated by the working coil affects the filter circuit and the temperature of the filter circuit increases reducing its noise reduction effect
Solution Approach 1:
The filter circuit is extracted from the central position below the working coil and relocated to the lower end of the case. This separation removes the filter circuit from the harmful magnetic field environment, allowing it to perform noise filtering without being affected by the working coil's magnetic interference and heat.
Solution Approach 2:
The filter circuit is repositioned from a vertical arrangement (center below coil) to a horizontal arrangement (lower end of case). This spatial reconfiguration in another dimension maximizes the distance between the working coil and filter circuit while maintaining compact overall structure.
2Device complexity
If the filter circuit is disposed below the high-power working coil, then the structure is simplified, but the temperature of the filter circuit increases and it cannot perform noise filtering properly
Solution Approach 1:
The filter circuit is extracted from the high-temperature zone below the high-power working coil and placed at the lower end of the case. This extraction maintains structural simplicity while ensuring the filter circuit operates in a cooler environment suitable for reliable noise filtering.
3Volume of moving object
If the electric wire is disposed inside the case connecting power feeder and filter circuit, then the connection is compact, but the electric wire is exposed to strong magnetic field increasing noise
Solution Approach 1:
The electric wire is extracted from the interior of the case and routed along the outer surface. This extraction removes the electric wire from the strong magnetic field environment generated by the working coil, preventing magnetic interference and noise while maintaining compact overall design.
4Adaptability or versatility
If multiple working coils are used for different heating areas, then heating versatility is improved, but the magnetic field interference and noise increase
Solution Approach 1:
Multiple working coils are merged into a coordinated system controlled by a single controller, with a single filter circuit handling noise from all coils. The controller selectively activates specific coils based on heating needs, providing versatility while the unified filter circuit manages cumulative magnetic interference efficiently.
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 generated by the magnetic fields, optimizes electromagnetic compatibility, and improves the performance of the filter circuit by maintaining lower temperatures and maximizing the distance from the high-power working coil.
Implementation Method 1
In an induction heating method, 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 2
eddy current produced in the generated magnetic field is used to heat an object to be heated
Implementation Method 3
The filter circuit can reduce noise that affects another electronic device.
Data Source
Figure 1~2
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Figure 5~6
AI summary
The present disclosure relates to an electric range. In the electric range, filter circuits are disposed to gather 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.