Induction Heating Device Noise Reduction via Frequency Tuning
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Solution Overview
Problem
Induction heating devices with three or more heating areas and working coils face challenges in reducing interference noise, as existing methods are not effective and can lead to increased size and complexity, and difficulty in meeting user output requirements.
Innovation Solution
The induction heating device employs multiple working coils with independent power modules and a control unit that adjusts power supply and resonance frequencies to minimize interference noise by optimizing the distance between coils and controlling power distribution based on user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the distance between working coils is increased to reduce interference noise, then interference noise is reduced, but the volume and size of the induction heating device increase
Solution Approach 1:
The patent adjusts the resonance frequencies of working coils by changing operating parameters (frequency tuning) rather than physically separating the coils. By controlling the frequency difference between adjacent coils to be outside the audio frequency range (20Hz-20kHz), the patent reduces interference noise without increasing device dimensions.
2Object-affected harmful factors
If output of heating areas is adjusted through control of power module operation to reduce interference noise, then interference noise is reduced, but it becomes difficult to provide the output required by the user
Solution Approach 1:
The patent changes the operating frequency parameter of the power modules instead of adjusting output power. By tuning the resonance frequencies of different working coils to have a frequency difference outside the audio range, the patent eliminates interference noise while maintaining full power output capability for each heating area.
3Object-affected harmful factors
If operating frequencies of working coils are adjusted to reduce interference noise, then interference noise is reduced, but the method cannot be applied to induction heating devices having three or more heating areas
Solution Approach 1:
The patent implements a systematic frequency assignment method where each working coil is assigned a specific resonance frequency, and the frequency difference between adjacent coils is controlled to be outside the audio range. This scalable approach can be applied to devices with any number of heating areas (2, 3, or more), making it universally applicable.
4Object-affected harmful factors
If thermal power is arbitrarily adjusted to reduce interference noise, then interference noise is reduced, but it is difficult to meet user heating requirements
Solution Approach 1:
The patent uses frequency parameter adjustment instead of thermal power adjustment. Since frequency tuning does not affect the power delivery capability, users can freely control the heating output of each zone independently without causing interference noise, maintaining full ease of 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 effectively reduces interference noise in induction heating devices with multiple heating areas and coils, maintaining performance while minimizing physical size and complexity, ensuring the required output is met.
Implementation Method 1
When an electric power source is supplied to an induction heating device, a predetermined magnitude of high-frequency voltage is supplied to a working coil. Accordingly, an induction magnetic field is generated around the working coil
Implementation Method 2
When a magnetic line of force of the induction magnetic field that is generated as described above passes through the bottom of a container, which includes a metallic ingredient and is placed on the induction heating device, eddy currents are generated inside the bottom of the container. Then the generated eddy currents flow through the bottom of the container, and the container itself is heated.
Implementation Method 3
adjust operating frequencies of each working coil... maintain a distance between the working coils as long as possible... a distance between working coils increases to a certain degree or above, interference noise is reduced regardless of the magnitude of resonance frequencies
Data Source
AI summary
Disclosed herein is an induction heating device capable of reducing interference noise. The induction heating device includes a first power module supplying power for driving to at least one of a first working coil and an inner coil, a second power module supplying power for driving to at least one of a second working coil and an outer coil, and a control unit controlling supply of power by the first power module and the second power module. In an embodiment, the control unit may cut off supply of power to the outer coil when an instruction for heating to at least one of a first heating area and a second heating area, and an instruction for heating to a third heating area are input.