Induction Heating Controller Empty Vessel Detection
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Solution Overview
Problem
Conventional induction heating devices face issues with overheating when preheating empty vessels, leading to rapid temperature rises that break the fuse, rendering the device inoperable until replacement, and potentially causing fires due to uncontrolled heating.
Innovation Solution
The induction heating device incorporates a controller that determines whether a vessel is empty by measuring the temperature rise time, cutting off power when the vessel is deemed empty to prevent fuse breakage and overheating, using reference temperatures and determination times to differentiate between loaded and unloaded states without additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the induction heating device continuously heats the vessel without detecting load presence, then the heating function is maintained, but the vessel becomes overheated and the fuse breaks
Solution Approach 1:
The system performs preliminary detection of load presence in the vessel before initiating continuous heating operation. By measuring temperature rise rate and comparing it against reference values, the controller determines whether to enable or disable heating functionality, preventing fuse breakage before it occurs
Solution Approach 2:
The system continuously monitors the temperature rise rate of the vessel during heating operation and uses this feedback to determine load presence. When the temperature rise rate exceeds the reference value indicating empty vessel conditions, the controller automatically disables heating to prevent overheating and fuse breakage
2Object-affected harmful factors
If the induction heating device uses additional sensors to detect load presence, then overheating is prevented, but the device complexity increases
Solution Approach 1:
The system uses the existing temperature sensor to monitor the vessel's temperature rise rate as a self-diagnostic indicator of load presence. By analyzing the temperature change characteristics themselves rather than requiring separate detection sensors, the system achieves load detection functionality without adding components
Solution Approach 2:
The controller acts as an intermediary that processes temperature rise rate data and translates it into load presence determination. By using software-based detection algorithms rather than hardware sensors, the system achieves intelligent detection while maintaining simplicity
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 prevents fuse breakage and uncontrolled heating during preheating of empty vessels, ensuring safe operation and extending device lifespan by automatically stopping heating when an empty vessel is detected, thus preventing fires and maintaining functionality.
Implementation Method 1
a predetermined magnitude of high-frequency voltage is applied to the working coil. Accordingly, an induction magnetic field occurs around the working coil disposed in the induction heating device. When a magnetic line of force of the induction magnetic field passes through a bottom of the vessel including a metal component which is placed on the induction heating device, an eddy current occurs in the bottom of the vessel
Implementation Method 2
When the eddy current flows through the bottom of the vessel, the vessel itself is heated
Implementation Method 3
The induction heating method is a method of generating an eddy current in a vessel that is made of a metal component using a magnetic field that occurs around a working coil when a predetermined magnitude of high-frequency power is applied to the working coil so that the vessel itself is heated
Data Source
AI summary
An induction heating device capable of preventing a fuse breaking phenomenon that occurs when a user preheats an empty vessel by determining whether or not a load is present in the vessel, and a method for controlling an induction heating device. In order to prevent a rapid rise in temperature of a vessel occurring in process during which a user preheats an empty vessel using an induction heating device and a fuse breaking phenomenon resulting therefrom, a controller of the induction heating device may determine whether or not a vessel placed on a working coil is an empty vessel in a vessel heating process, that is, whether or not a load is present in the vessel.