Induction heating cooking device
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Solution Overview
Problem
Induction cooking apparatuses face challenges in accurately measuring container eccentricity and distinguishing between conductive and non-conductive containers, leading to reduced heating efficiency and user inconvenience.
Innovation Solution
The apparatus includes sensing coils arranged along the circumference of the heating coil to detect container position and conductivity, with a controller determining whether to drive the inverter based on sensing values, allowing for accurate eccentricity measurement and separate detection of conductive and non-conductive containers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single detecting unit is used to determine container presence, then the device complexity is reduced, but the measurement precision of container position and conductivity is insufficient
Solution Approach 1:
The patent divides the detection function into multiple sensing coils arranged along the circumferential direction of the heating coil. Each sensing coil detects magnetic field changes at different positions, enabling precise determination of container position and conductivity without requiring a single complex detecting unit. The segmented arrangement allows independent measurement of eccentricity and container type.
Solution Approach 2:
The patent adds the circumferential dimension to the detection system by arranging sensing coils along the circumference of the heating coil. This dimensional expansion enables the system to detect not only the presence of a container but also its precise angular position and orientation, transforming a simple presence detection into a multi-parameter measurement system.
2Ease of operation
If the detecting unit uses a threshold-based detection method, then the ease of operation is improved, but the reliability of distinguishing conductive and non-conductive containers is reduced
Solution Approach 1:
The patent applies different evaluation criteria to different sensing coils based on their local positions. Each sensing coil's output is independently evaluated against thresholds, and the collective results from multiple positions provide reliable classification. This local quality approach maintains simple threshold-based operation while improving overall reliability through spatial distribution.
Solution Approach 2:
The system uses feedback from multiple sensing coils to continuously monitor and evaluate container presence and properties. The controller integrates signals from all sensing coils and applies threshold-based decision logic to reliably distinguish between conductive and non-conductive containers, maintaining operational simplicity while enhancing reliability.
3Loss of energy
If the inverter is interrupted for eccentric containers, then the heating efficiency is improved by preventing wasted energy, but the productivity is reduced due to longer cooking time
Solution Approach 1:
Instead of completely interrupting heating for eccentric containers, the system applies partial action by providing guidance to users for proper container placement. The detection system identifies eccentricity and prompts users to adjust container position, allowing heating to continue once properly positioned. This approach prevents energy waste from heating non-conductive or improperly positioned containers while maintaining productivity through continuous operation.
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 solution enhances heating efficiency by accurately determining container position and conductivity, improving user convenience by preventing unnecessary interruptions and guiding users on proper container placement.
Implementation Method 1
an inverter unit performing a switching operation according to an input signal Vin supplied by the power supply unit to apply a current to a coil on which a conductive container is seated
Implementation Method 2
a high frequency current flows through a working coil or a heating coil and an eddy current flows when a strong magnetic line of force generated due to the high frequency current passes through a container (i.e., a cooking container) to heat the container itself
Implementation Method 3
An induction cooking apparatus is an electric cooking device in which a high frequency current flows through a working coil or a heating coil and an eddy current flows when a strong magnetic line of force generated due to the high frequency current passes through a container (i.e., a cooking container) to heat the container itself to perform a cooking function
Data Source
AI summary
Provided is an induction cooking apparatus including a heating part including a working coil forming a heating region and configured to heat a container placed in the heating region, an inverter configured to supply a driving voltage to the working coil, a plurality of sensing coils arranged along a circumferential portion of the working coil and sensing the container placed in the heating region, and a controller configured to determine whether to drive the inverter on the basis of information acquired from the plurality of sensing coils.