Induction Heating Vessel Detection Noise Reduction
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Solution Overview
Problem
Induction heating devices with three-phase power supply face accuracy issues in detecting vessels due to noise generated by adjacent working coils, which degrades the detection accuracy.
Innovation Solution
A method that involves selecting a reference voltage from multiple input voltages with different phases, determining a detection time point based on the reference voltage, and performing the detection operation at that time point to minimize noise and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a working coil adjacent to the detection coil is operated, then the induction heating device can heat objects on multiple coils simultaneously, but noise is generated in the input voltage of the detection coil which deteriorates vessel detection accuracy
Solution Approach 1:
The controller determines a detection time point before performing vessel detection, selecting a moment when the adjacent working coil's voltage is at zero or minimum level. By performing detection at this pre-determined time point, the system eliminates noise interference from adjacent coils while maintaining multi-coil heating capability
Solution Approach 2:
The system performs vessel detection at specific periodic intervals determined by the power supply phase, selecting detection moments when adjacent coils are not generating interference. This periodic detection approach allows continuous monitoring while avoiding noise from simultaneously operating adjacent coils
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
The method enhances the accuracy and reliability of vessel detection in induction heating devices by minimizing noise from adjacent working coils, thereby improving the detection process.
Implementation Method 1
In the induction heating method, eddy current may be generated in the object made of metal based on a magnetic field generated, around the coil, when a high-frequency power of a predetermined magnitude is applied to the coil to heat the object
Implementation Method 2
In the induction heating method, eddy current may be generated in the object made of metal based on a magnetic field generated, around the coil
Implementation Method 3
In the induction heating method, eddy current may be generated in the object made of metal based on a magnetic field generated, around the coil, when a high-frequency power of a predetermined magnitude is applied to the coil to heat the object
Data Source
AI summary
A method controls an induction heating device that is configured to operate based on a multi-phase power supply and that includes a working coil configured to heat an object and a controller configured to detect the object. The method includes: receiving voltage information related to a first input voltage and a second input voltage that are supplied by the multi-phase power supply and that have different phases from each other; selecting a reference voltage among the first input voltage and the second input voltage based on the voltage information; determining a detection time point, which corresponds to a time instant at which a detection operation is to be performed for detecting the object on the working coil, based on the reference voltage; and performing the detection operation at the detection time point.