Induction Heater Coil Frequency Matching for Noise Reduction
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Solution Overview
Problem
Induction heating apparatuses generate noise due to different output frequencies when multiple heating coils operate simultaneously.
Innovation Solution
The apparatus includes a controller that sets a maximum output frequency for each heating coil differently and uses duty ratio control to match these frequencies, reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple heating coils operate simultaneously with different output frequencies, then heating efficiency is improved, but noise is generated
Solution Approach 1:
The patent adjusts the operating frequencies of multiple heating coils to be identical, changing the frequency parameter from different values to the same value. This resolves the noise issue caused by frequency differences while maintaining the ability of multiple coils to operate simultaneously for efficient heating.
2Power
If the maximum output frequency is set differently for each heating coil, then individual coil performance is optimized, but frequency mismatch causes noise when coils operate simultaneously
Solution Approach 1:
The controller dynamically adjusts the maximum output frequency of each heating coil based on operational conditions. When multiple coils operate simultaneously, their maximum output frequencies are set to be identical, eliminating frequency mismatch and noise while still allowing each coil to be optimized for its specific heating task.
Solution Approach 2:
The patent implements dynamic frequency adjustment where the maximum output frequency of heating coils is not fixed but changes based on operational mode. The controller modifies frequency parameters in real-time to match between coils during simultaneous operation, creating a dynamic system that adapts to prevent noise.
3Object-generated harmful factors
If duty ratio control is used to match maximum output frequencies, then noise is reduced, but control complexity increases
Solution Approach 1:
The controller uses feedback mechanisms to monitor and adjust the operating frequencies of heating coils. By continuously comparing frequency parameters and making adjustments through duty ratio control, the system maintains matched frequencies between coils, reducing noise while using systematic control methods.
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 effectively reduces noise by ensuring that the maximum output frequencies of the heating coils are matched, even when operating simultaneously, thereby minimizing frequency differences that cause noise.
Implementation Method 1
When a current is applied to the heating coil and a magnetic field is generated, a secondary current is induced in the cooking vessel
Implementation Method 2
Joule heat is generated by a resistance component of the cooking vessel itself
Implementation Method 3
When a current is applied to the heating coil and a magnetic field is generated, a secondary current is induced in the cooking vessel
Implementation Method 4
Joule heat is generated by a resistance component of the cooking vessel itself
Data Source
AI summary
An induction heating apparatus includes: a first heating portion including a single heating coil; a second heating portion including an inner heating coil and an outer heating coil; and a controller configured to control an operation of the first heating portion and an operation of the second heating portion. A maximum output frequency of an operation of the single heating coil is configured to be set higher than a maximum output frequency of a single operation of the inner heating coil of the second heating portion, and the maximum output frequency of the operation of the single heating coil is configured to be set lower than a maximum output frequency of simultaneous operations of the inner heating coil and the outer heating coil.