Induction Cooker Controller Detects Current Changes
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Solution Overview
Problem
Existing induction heating cookers cannot automatically discriminate the type, volume, and content of the heating target, leading to inefficient heating power adjustment and potential overheating or energy wastage.
Innovation Solution
An induction heating cooker with a controller that detects current changes to adjust the drive signal for the inverter circuit, allowing for automatic determination of the heating target's type and volume, and thereby optimizing heating power based on the detected current changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inverter circuit operates at high output power, then heating efficiency is improved, but the risk of overheating and energy wastage increases when the heating target is empty or contains insufficient content
Solution Approach 1:
The system performs preliminary detection of the heating target's presence and content level before initiating high-power heating operation. By detecting input current changes during a measurement period and comparing them against threshold values, the system determines whether the heating target is empty or contains insufficient content, and adjusts the inverter output accordingly to prevent overheating and energy wastage.
2Adaptability or versatility
If manual adjustment of heating power is required, then flexibility is improved, but ease of operation deteriorates due to user burden
Solution Approach 1:
The system automatically detects the heating target's content level by monitoring input current changes and self-adjusts the heating power without requiring manual user intervention. The controller compares detected current changes against predetermined thresholds and autonomously controls the inverter circuit to provide appropriate heating power, making the system both flexible and easy to operate.
3Device complexity
If simple current detection is used, then device complexity is reduced, but measurement precision deteriorates in determining heating target content
Solution Approach 1:
The system uses feedback from input current changes during a measurement period to accurately determine the heating target's content level. By continuously monitoring the input current to the inverter circuit and comparing the change amount against threshold values, the system achieves precise detection of whether the heating target is empty or contains insufficient content, using only simple current detection without complex sensors.
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 precise control of heating power, prevents overheating, and achieves energy-saving operations by accurately determining the content and adjusting the heating power accordingly.
Implementation Method 1
a heating coil configured to inductively heat a heating target
Implementation Method 2
a heating coil configured to inductively heat a heating target
Data Source
AI summary
When an inverter circuit is driven with a predetermined driving frequency, an amount of current change of an input current or a coil current in a set period is detected, and high frequency power to be supplied from the inverter circuit to a heating coil is adjusted in accordance with the amount of current change.