Induction Heating Control with Corrected Reference Temperature
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Solution Overview
Problem
Existing temperature control systems for induction cooking devices often fail to reliably maintain the desired temperature, especially when there is a significant difference between the temperature of the heating element and the food or water being cooked, leading to inefficient heating and boiling.
Innovation Solution
A device with a correction mechanism that adjusts the reference value based on a correction command, allowing for manual or automatic correction of the temperature control by using a detection means to derive a reference variable from electrical variables of the inductor, ensuring that the temperature of the heating element is maintained evenly and efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the heating power is increased to quickly heat the heating element, then the heating speed is improved, but the temperature difference between the heating element and the food/water increases causing excessive boiling and unreliable temperature control
Solution Approach 1:
The patent applies preliminary action by detecting a reference variable from electrical variables of the inductor before forming the reference value for temperature control. This preliminary detection allows the system to anticipate temperature conditions and adjust the reference value accordingly, preventing excessive temperature differences before they occur rather than reacting after overheating begins
Solution Approach 2:
The patent implements feedback by continuously monitoring the reference variable derived from electrical variables of the inductor and using this information to dynamically adjust the reference value. The control unit compares the actual temperature conditions with the reference value and modifies heating power in real-time, creating a closed-loop control system that maintains reliable temperature control even during rapid heating
2Loss of time
If the reference value is formed immediately at the start of heating, then the temperature control starts promptly, but the reference value becomes inaccurate due to fluctuations in electrical variables causing unreliable control
Solution Approach 1:
The patent applies dynamics by making the reference value adaptive rather than static. The control unit dynamically adjusts the reference value based on the detected reference variable and the actual heating state. This dynamic adjustment allows the system to start temperature control promptly while continuously optimizing the reference value accuracy as heating progresses and electrical variables stabilize
3Measurement precision
If the temperature of the heating element is monitored directly, then the temperature measurement is direct, but the temperature of the thin layer does not correspond to the temperature of the food or water causing control inaccuracy
Solution Approach 1:
The patent uses an intermediary approach by detecting a reference variable from electrical variables of the inductor rather than directly measuring food or water temperature. This reference variable serves as an indirect but reliable indicator of the thermal state affecting the food/water. The control system uses this intermediary measurement to adjust heating power, achieving accurate control of food/water temperature without requiring direct contact with the food
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 enables reliable and efficient temperature control by correcting the reference value in response to changes, ensuring that the heating element maintains the desired temperature, preventing excessive boiling and ensuring consistent cooking performance.
Implementation Method 1
Device for heating a heating element (4), in particular with an inductor (10)
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a device (2), in particular, for inductively heating up a heating element (4) by means of an inductor (10) and an element (14)for recording a reference quantity (F) which is dependent on the temperature (TH) of the heating element (4) and derived from the electric quantity of the inductor (10) in such a way that it makes it possible to form the reference value (F1, F2, F3) from the reference quantity (F) and to adjust the temperature (TH) according to the reference quantity (F) adjustment by means of the reference value (F1, F2, F3). The aim of said invention is to carry out a reliable adjustment of a water temperature (TW ) or of a cooked product even at extreme conditions or when the reference value (F1, F2) is incorrect. For this purpose, the device (2) comprises a correction means (16)for correcting the reference value (F1, F2).