Induction Cooktop Vessel Detection via Power Segmentation
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Solution Overview
Problem
Induction heating cooking apparatuses lack efficient methods to quickly determine the type of vessel placed and respond to changes in vessel state or coil temperature, leading to suboptimal heating performance.
Innovation Solution
A cooking apparatus equipped with a detection sensor to measure input current and voltage, a controller to calculate power values and determine vessel type, and a relay switch to adjust heating modes based on vessel type, along with a temperature sensor and storage to manage power limits and reset heating operations when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional vessel detection methods are used in induction heating cooking apparatuses, then the system can operate with basic heating functions, but the response time to determine vessel type and adapt to vessel state changes is slow
Solution Approach 1:
The patent segments the power control into multiple frequency ranges (first frequency range and second frequency range) with different reference power values. The controller divides the detection process into stages: first determining vessel type by comparing power values in the first frequency range, then adjusting to the second frequency range for heating control. This segmentation enables fast vessel type identification without requiring complex continuous monitoring across all frequencies.
Solution Approach 2:
The patent applies preliminary action by pre-setting reference power values for different frequency ranges and vessel types. The controller first determines the vessel type using the first frequency range before switching to the second frequency range for actual heating. This preliminary classification allows the system to quickly identify vessel type and prepare appropriate heating parameters, significantly reducing the overall response time.
2Reliability
If the cooking apparatus uses a simple power control method, then the device complexity is low, but the response to vessel state changes or coil temperature variations is delayed
Solution Approach 1:
The patent implements feedback control by continuously monitoring the power value and comparing it with reference power values stored in the storage unit. The controller adjusts the operating frequency based on the comparison result, creating a closed-loop control system. This feedback mechanism enables the apparatus to automatically respond to vessel state changes and coil temperature variations, ensuring reliable and accurate control without requiring overly complex external sensing systems.
3Productivity
If the apparatus operates at high power levels for fast heating, then heating efficiency is improved, but the risk of overheating or safety issues increases
Solution Approach 1:
The patent applies dynamics by making the operating frequency adjustable rather than fixed. The controller dynamically changes the operating frequency between first and second frequency ranges based on the detected power value and vessel type. This dynamic frequency adjustment allows the system to optimize heating efficiency at appropriate frequencies while avoiding conditions that lead to overheating, thus balancing productivity with safety.
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
Enables rapid determination of vessel type and implements a power control algorithm with fast response to vessel state changes or coil temperature variations, improving heating efficiency and safety.
Implementation Method 1
an induction heating coil to generate a magnetic field when a current is applied thereto. If the current is applied to the induction heating coil to generate the magnetic field, a secondary current is induced to the cooking vessel, and Joule heat is generated due to resistance components of the cooking vessel.
Implementation Method 2
Joule heat is generated due to resistance components of the cooking vessel. Accordingly, the cooking vessel is heated by the Joule heat so that food contained in the cooking vessel is cooked.
Data Source
AI summary
A cooking apparatus and a control method thereof, and more particularly, technology for determining the type of vessel placed in the cooking apparatus and controlling power in response to a state change of the placed vessel or a temperature change of a coil. In accordance with one aspect, a cooking apparatus includes: a coil on which a vessel is placed, configured to form a magnetic field upon application of a current; a detection sensor configured to detect a magnitude of an input current applied differently according to a type of the vessel and a magnitude of an input voltage of the cooking apparatus; and a controller configured to determine a type of the placed vessel according to a power value calculated based on the detected input current and input voltage, and to determine a heating mode of the cooking apparatus based on the determined type of vessel.