Cooking Vessel Sensor for Induction Heating
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Solution Overview
Problem
Conventional induction heating devices consume excessive power to determine whether a cooking vessel is suitable for induction heating, limiting their ability to accurately and quickly identify the type of vessel and requiring significant energy for the process.
Innovation Solution
An induction heating device equipped with a cooking vessel sensor that includes a sensing coil and a temperature sensor, which determines the type of cooking vessel by measuring current flow and temperature, allowing for real-time identification with minimal power consumption, eliminating the need for user input to select a heating region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a predetermined amount of power is supplied to the working coil for a predetermined time to determine whether eddy current occurs in the cooking vessel, then the type of cooking vessel can be determined, but excessive power (200 W or more) is consumed
Solution Approach 1:
The patent divides the identification process into two distinct stages: a preliminary detection stage using a sensing coil to determine basic vessel presence and type, followed by a heating stage using the working coil only if needed. This segmentation allows accurate vessel identification with minimal power consumption during the detection phase, resolving the contradiction between measurement precision and energy use.
Solution Approach 2:
The patent introduces a sensing coil as an intermediary device between the user and the working coil. This sensing coil performs the initial vessel detection and characterization without requiring high power input, serving as a low-power mediator that prepares the system for subsequent high-power heating operations only when appropriate vessels are detected.
2Productivity
If high-frequency power is applied to the working coil to generate a magnetic field for induction heating, then the cooking vessel can be heated quickly and efficiently, but the device cannot identify the type of cooking vessel accurately without consuming significant energy
Solution Approach 1:
The patent performs preliminary vessel detection and characterization using the sensing coil before applying high-frequency power to the working coil for heating. This preliminary action identifies suitable vessels and determines their properties, ensuring that high-power heating is applied only when appropriate, thereby maintaining high productivity while minimizing unnecessary energy consumption.
Solution Approach 2:
The system uses the sensing coil to continuously monitor and detect vessel properties, providing feedback to the control system. This feedback mechanism allows the device to adjust its operation, applying high-power heating only when vessel detection confirms suitability, thus optimizing the balance between heating speed and energy consumption.
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 device accurately and quickly identifies the type of cooking vessel while consuming less power, enabling immediate determination of inductive properties and simultaneous temperature measurement, enhancing energy efficiency and user convenience.
Implementation Method 1
a sensing coil... determines the type of cooking vessel by measuring current flow
Implementation Method 2
a temperature sensor... Simultaneous temperature measurement
Implementation Method 3
a high-frequency power of a predetermined magnitude is applied to a working coil such that a magnetic field is generated around the working coil
Implementation Method 4
In the inductive heating method, a high-frequency power of a predetermined magnitude is applied to a working coil such that a magnetic field is generated around the working coil and an eddy current is generated in a cooking vessel made of a metal, such that the cooking vessel itself is heated.
Implementation Method 5
an eddy current is generated in a cooking vessel made of a metal... The resulting eddy current flows in the bottom of the cooking vessel, thereby heating the cooking vessel
Data Source
AI summary
A cooking vessel sensor and an induction heating device including a cooking vessel sensor is provided. The cooking vessel sensor may include a cylindrical hollow body having a first receiving space defined therein; a hollow cylindrical magnetic core received in the first space and having a second receiving space defined therein; and a sensing coil wound on an outer face of the side wall by a predetermined number of winding counts. The cylindrical hollow body may have a side wall having a coil outlet defined therein, and the sensing coil may pass though the coil outlet out of the body. The cooking vessel sensor may further include a controller that applies a current to the sensing coil and determines, based on a sensing result of the cooking vessel sensor, whether the cooking vessel is inductive or has an inductive heating property.