Induction Cooker Coil Frequency Control for Composite Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Induction heating cooking apparatuses struggle to uniformly heat composite heating targets with magnetic and nonmagnetic materials due to inadequate power distribution, leading to uneven temperature profiles.
Innovation Solution
The apparatus includes multiple heating coils with a controller that determines the material type of each heating target and adjusts the frequency of the high-frequency current supplied to each coil, setting a higher frequency for nonmagnetic materials and a lower frequency for magnetic materials to optimize heating uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single frequency of high-frequency current is supplied to all heating coils, then the control system is simple, but uneven heating occurs in composite heating targets with magnetic and nonmagnetic materials
Solution Approach 1:
The patent applies local quality by assigning different frequencies to different heating coils based on the material type detected in each region. Heating coils are divided into first and second groups, with the first group operating at a first frequency and the second group at a second frequency, allowing each region to be optimized for its specific material (magnetic or nonmagnetic).
Solution Approach 2:
The control system dynamically adjusts the frequency of high-frequency current supplied to each heating coil group based on real-time material detection. The controller switches between different frequency settings depending on whether magnetic or nonmagnetic materials are detected, enabling adaptive heating optimization.
2Area of stationary object
If power distribution is adjusted based on outer diameter of heating target, then heating coverage is optimized, but material-specific heating characteristics cannot be achieved
Solution Approach 1:
The patent changes the frequency parameter of the high-frequency current based on material type detection. When magnetic materials are detected, a first frequency is used, while nonmagnetic materials trigger a second frequency. This parameter change enables the system to adapt to different material properties while maintaining appropriate heating coverage through multi-coil configuration.
3Ease of operation
If all heating coils are supplied with the same high-frequency current, then the system operation is simple, but interference sounds are generated due to frequency differences in adjacent coils
Solution Approach 1:
The system divides heating coils into distinct groups with different frequency assignments based on the material regions they serve. By localizing different frequency operations to specific coil groups corresponding to magnetic or nonmagnetic material regions, the patent eliminates interference sounds while maintaining operational simplicity through automated material detection and control.
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 approach reduces temperature unevenness and allows for efficient heating of composite targets by matching the frequency of the high-frequency current to the material type, enhancing heating uniformity and efficiency.
Implementation Method 1
a plurality of heating coils aligned in at least one row on a flat surface, a plurality of inverter circuits each configured to supply a high-frequency current to the corresponding one of the plurality of heating coils
Implementation Method 2
supply a high-frequency current to the corresponding one of the plurality of heating coils
Implementation Method 3
inhibits interfering sound caused by a difference in frequencies of high-frequency magnetic fields generated by heating coils arranged adjacent to each other
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An induction heating cooking apparatus includes a plurality of heating coils aligned in at least one row on a flat surface, a plurality of inverter circuits each configured to supply a high-frequency current to the corresponding one of the plurality of heating coils, and a controller configured to control driving of the plurality of inverter circuits. The plurality of heating coils include a first heating coil and a second heating coil that are adjacent to each other. The controller is configured to, when a material forming a heating target loaded on an upper part of the first heating coil is a magnetic material, and a material forming the heating target loaded on an upper part of the second heating coil at least includes a nonmagnetic material, set a frequency of the high-frequency current supplied to the second heating coil higher than a frequency of the high-frequency current supplied to the first heating coil.