Induction Cooktop Frequency Control for Non-Magnetic Heating
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Solution Overview
Problem
Induction heating cooktops face reduced heating efficiency when used with non-magnetic materials due to magnetic fields coupling with intermediate heating bodies instead of the intended containers.
Innovation Solution
The cooktop adjusts the operating frequency and current direction of the working coils based on the material of the object to be heated, using an inverter to control magnetic field coupling with an intermediate heating body formed of non-magnetic metal, thinner than the skin depth, to optimize heating efficiency for both magnetic and non-magnetic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single operating frequency is used for all materials, then device complexity is reduced, but heating efficiency cannot be optimized for different material types
Solution Approach 1:
The system performs self-service by automatically detecting the material type (magnetic or non-magnetic) and autonomously selecting the appropriate operating frequency without requiring manual intervention or complex user input, thereby maintaining simplicity while achieving optimization
Solution Approach 2:
The patent implements feedback through the material detection mechanism that provides information about the placed object's material type to the control unit, which then uses this feedback to select the optimal operating frequency, enabling efficient heating for different material types
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 enhances heating efficiency by selectively heating the container or intermediate heating body, improving overall efficiency by controlling frequency and phase of the magnetic field, ensuring effective heating regardless of material type.
Implementation Method 1
a working coil (WC) configured to generate a magnetic field for heating the object to be heated or the intermediate heating body
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
forming the intermediate heating body with a non-magnetic material having a thickness thinner than a skin depth
Data Source
AI summary
An induction heating-type cooktop according to an embodiment of the present disclosure comprises: a upper plate part on which an item to be heated is placed; a working coil for generating magnetic field for heating the item to be heated or an intermediate heating body; and an inverter unit that operates so as to provide the working coil with current, wherein the inverter unit can adjust the operating frequency in accordance with the constituent material of the item to be heated.