Induction Heating Inverter Control for Quiet Startup
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Solution Overview
Problem
Induction heating apparatuses generate excessive and instantaneous noise during the initial heating process due to sudden increases in peak-to-peak current values, causing user inconvenience and potential misinterpretation of apparatus failure.
Innovation Solution
The controller adjusts the duty cycles and driving frequency of the inverter circuit's switching elements to gradually increase the current supply to the working coil, minimizing initial noise by preventing sudden peaks and ensuring a smooth power match with the required power level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the inverter circuit generates alternating current to heat the container, then the heating function is achieved, but excessive and instantaneous noise is generated due to sudden increases in peak-to-peak current values
Solution Approach 1:
The controller performs a preliminary noise suppressing operation before the main heating operation. During this preliminary phase, the controller adjusts the duty cycles and driving frequency of the inverter circuit to gradually increase the current supply to the working coil, preventing sudden peaks in current that cause noise. Only after this preliminary adjustment does the controller proceed to the main heating operation at the target power level.
2Power
If the peak value of alternating current is increased to match required power level, then the power output is improved, but the peak-to-peak current change increases causing noise
Solution Approach 1:
The controller dynamically adjusts the duty cycles of the switching elements and the driving frequency of the inverter circuit during the initial phase. By continuously modifying these parameters, the controller gradually increases the peak current value in a controlled manner, matching the required power level while preventing sudden jumps in peak-to-peak current that would generate noise.
3Productivity
If the alternating current is supplied to the working coil to heat the container, then the heating function is achieved, but the initial process causes excessive noise before power matching
Solution Approach 1:
Before initiating the main heating operation, the controller executes a preliminary noise suppressing operation that adjusts the inverter circuit parameters. This preliminary action prepares the system by gradually building up the current supply, ensuring that when the main heating operation starts, the power level is already matched and noise is minimized, thus maintaining high productivity without the noise problem.
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 initial driving noise by gradually increasing current peaks, providing a quieter and more reliable heating experience without user confusion.
Implementation Method 1
an induced magnetic field is generated around the working coil disposed in the induction heating apparatus. When magnetic line of force of the induced magnetic field generated passes through a bottom of the metallic container over the working coil, eddy current is generated inside the bottom of the container
Implementation Method 2
eddy current is generated inside the bottom of the container. Accordingly, the eddy current generated flows in the container, and the container itself is heated
Implementation Method 3
the eddy current generated flows in the container, and the container itself is heated
Data Source
AI summary
The present disclosure relates to an induction heating apparatus and a method for controlling the same. In one embodiment, when a power level of a heating zone is input, a noise suppressing operation may be performed to suppress initial driving noise that might occur before a frequency for heating a container. A controller of the induction heating apparatus may adjust duty cycles of switching signals input to switching elements included in an inverter circuit and a driving frequency of the inverter circuit respectively and perform the noise suppressing operation. In the embodiment, when a power level of a heating zone is set and a container starts to be heated, initial driving noise may be reduced.