Cooking Appliance Magnetic Field Control Module
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Solution Overview
Problem
Induction heating cooking appliances face low heating efficiency when heating non-magnetic substances due to the coupling of the magnetic field with an intermediate heating element, which reduces the efficiency compared to heating magnetic substances.
Innovation Solution
A cooking appliance design that includes a working coil, an intermediate heating element, and a magnetic field control module with a canceling coil, which selectively forms closed loops based on the type of object being heated, allowing for adjustment of the magnetic field concentration region to optimize heating efficiency for both magnetic and non-magnetic substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an intermediate heating element is added to enable heating of non-magnetic substances, then heating capability for non-magnetic substances is improved, but heating efficiency for magnetic substances deteriorates due to magnetic field coupling with the intermediate heating element
Solution Approach 1:
The patent introduces a magnetic field control module as an intermediary device between the working coil and the intermediate heating element. This module generates a second magnetic field that selectively couples with the intermediate heating element to cancel the first magnetic field, thereby controlling when the intermediate heating element absorbs magnetic field energy. By using this intermediary control mechanism, the system achieves both heating capability for non-magnetic substances and maintained efficiency for magnetic substances.
Solution Approach 2:
The patent changes the parameter of magnetic field coupling strength by controlling the second magnetic field generated by the magnetic field control module. When heating magnetic substances, the second magnetic field is adjusted to cancel the first magnetic field, preventing energy loss. When heating non-magnetic substances, the cancellation is reduced or removed, allowing the intermediate heating element to be heated. This dynamic parameter adjustment resolves the contradiction between versatility and efficiency.
2Loss of energy
If the magnetic field is directly coupled to the magnetic substance for efficient heating, then heating efficiency is improved, but the ability to heat non-magnetic substances deteriorates
Solution Approach 1:
The patent makes the magnetic field coupling dynamic by introducing a controllable second magnetic field through the magnetic field control module. The system can switch between two states: direct coupling for magnetic substances (high efficiency) and indirect coupling through the intermediate heating element for non-magnetic substances (versatility). This dynamic adaptability allows the system to optimize performance based on the material being heated.
Solution Approach 2:
The working coil is designed to serve multiple functions: directly heating magnetic substances when the second magnetic field cancels the first magnetic field, and indirectly heating non-magnetic substances when the intermediate heating element is heated. The magnetic field control module enables this multi-functionality by selectively controlling the magnetic field coupling state, making the system universal for both magnetic and non-magnetic material heating.
3Loss of energy
If a magnetic field control module is added to selectively cancel the magnetic field, then heating efficiency for magnetic substances is improved, but device complexity increases
Solution Approach 1:
The magnetic field control module serves as an intermediary control device that manages the magnetic field coupling between the working coil and the intermediate heating element. By introducing this dedicated control component, the system achieves precise control over magnetic field distribution, enabling efficient heating of magnetic substances while maintaining the capability to heat non-magnetic substances. The added complexity is justified by the significant improvement in heating efficiency and versatility.
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 solution enhances heating efficiency by selectively canceling or maintaining the magnetic field to directly or indirectly heat objects, maximizing energy transfer based on the material properties of the vessel, thereby improving overall cooking performance.
Implementation Method 1
when high-frequency power of a predetermined size is applied to the coil, the induction heating method generates an eddy current in the object to be heated consisting of a metal component using a magnetic field generated around the coil to heat the object to be heated itself
Implementation Method 2
the induction heating method generates an eddy current in the object to be heated consisting of a metal component using a magnetic field generated around the coil to heat the object to be heated itself
Implementation Method 3
a magnetic field control module for generating a second magnetic field canceling out at least a portion of the first magnetic field
Data Source
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AI summary
An exemplary embodiment of the present invention provides a cooking appliance including a magnetic field control module that selectively cancels a portion of a magnetic field reaching an intermediate heating element among a magnetic field generated from a working coil, and the magnetic field control module may include a canceling coil selectively forming a closed loop, and a switch capable of shorting or opening the canceling coil.