Induction Cooker Multi-Coil Frequency Control for Composite Heating
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Solution Overview
Problem
Induction cookers fail to achieve uniform heating temperatures when heating targets composed of composite materials, such as magnetic-layer attached frying pans, due to inadequate power distribution based on the material's properties.
Innovation Solution
The induction cooker employs multiple coils with dedicated inverter circuits and a controller to adjust high-frequency current frequencies and power distribution based on the material composition of the heating target, specifically stopping or adjusting the operation of coils under different materials to optimize heating for composite targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single heating coil is used for the entire heating surface, then the device structure is simple, but uniform heating cannot be achieved for composite material targets with different magnetic properties in different regions
Solution Approach 1:
The heating surface is divided into multiple independent heating zones with separate coils (first coil for center region, second coil for intermediate region, third coil for outer region). Each coil can be independently controlled to provide different power levels and frequencies, enabling differential heating strategies for magnetic and non-magnetic materials across different spatial regions.
Solution Approach 2:
Different coils are configured with different electrical parameters (power, frequency) suited for specific material types in specific regions. The first coil operates at parameters optimal for magnetic materials in the center, while the third coil uses parameters suited for non-magnetic materials at the periphery, achieving locally optimized heating quality.
2Adaptability or versatility
If power distribution is adjusted based on heating target outer diameter, then heating can be adapted to different sizes, but material-specific heating requirements cannot be addressed
Solution Approach 1:
The control system dynamically adjusts the operational state of each coil based on real-time detection of heating target material properties. When a composite material is detected, the system dynamically switches between different coil configurations and parameter sets to adapt to the varying magnetic properties across different regions of the target.
Solution Approach 2:
The system incorporates detection means to identify the material composition of the heating target and provides feedback to the control unit. Based on this feedback, the control unit automatically selects appropriate heating patterns, activating specific coils with specific parameters to match the detected material type and achieve optimal heating uniformity.
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 allows for more uniform heating temperatures by tailoring the induction heating to the material properties of the heating target, reducing unevenness and improving heating efficiency.
Implementation Method 1
an induction cooker having a first coil 111; a second coil 112 disposed on an outer peripheral side of the first coil 111; a third coil 113 disposed on an outer peripheral side of the second coil 112; a first inverter circuit configured to supply a first high-frequency current to the first coil 111; a second inverter circuit configured to supply a second high-frequency current to the second coil 112; a third inverter circuit configured to supply a third high-frequency current to the third coil 113
Implementation Method 2
when a heating target placed above the first coil is formed of a magnetic material, the heating target placed above the second coil is formed of a magnetic material or a composite containing a magnetic material and a non-magnetic material, and the heating target placed above the third coil is formed of a non-magnetic material
Implementation Method 3
a first inverter circuit configured to supply a first high-frequency current to the first coil 111; a second inverter circuit configured to supply a second high-frequency current to the second coil 112; a third inverter circuit configured to supply a third high-frequency current to the third coil 113
Data Source
AI summary
An induction cooker includes a first coil, a second coil, a third coil, and a controller. Responsive to determining that a heating target placed above a first coil is formed of a magnetic material, a heating target placed above a second coil is formed of a magnetic material or a composite containing a magnetic material and a non-magnetic material, and a heating target placed above a third coil is formed of a non-magnetic material, the controller stops an operation of a first inverter circuit, causes a second inverter circuit and a third inverter circuit to operate, and sets a frequency of a third high-frequency current to be higher than a frequency of a second high-frequency current.