Induction Heating Coil Sensor Segmentation for Temperature Accuracy
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Solution Overview
Problem
Conventional induction heating cookers are limited in accurately detecting the highest temperature of a to-be-heated object and preventing unsafe conditions, as they are designed for specific object placements and lack effective temperature detection across varying object positions.
Innovation Solution
An induction heating cooker with a controller that adjusts the operation of multiple heating coils based on object size and position, utilizing first and second temperature sensors to accurately detect temperatures, including contact-type and infrared sensors, to ensure safe and efficient heating regardless of object placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single temperature sensor is placed at the center of the heating port, then the structure is simple, but the temperature detection is inaccurate when the object is placed at different positions
Solution Approach 1:
The heating port is divided into multiple heating coil regions (center coil and peripheral coils), and temperature sensors are segmented and placed in corresponding positions for each region. This allows accurate temperature detection regardless of where the object is placed on the heating port, resolving the contradiction between measurement precision and device complexity by creating a modular sensor arrangement that matches the heating zones.
Solution Approach 2:
Different temperature sensors are placed at different locations (center of heating coils and between adjacent coils) to detect temperatures in specific local regions. This local quality approach ensures that the temperature detection matches the actual heating distribution, improving measurement precision without requiring a single complex sensor system.
2Adaptability or versatility
If the heating cooker is designed for center-only heating, then the control is simple, but the adaptability to different object positions is poor
Solution Approach 1:
The control system dynamically selects which heating coils to operate based on the detected object position and size. Instead of a fixed center-only heating mode, the system can activate different combinations of center and peripheral coils adaptively, improving object placement flexibility while keeping the control logic manageable through position-based selection.
Solution Approach 2:
The heating cooker is designed with multiple heating coils that can serve different functions depending on object placement. The same heating coil arrangement can handle objects placed at the center, at the periphery, or spanning multiple regions, making the system universal and adaptable to various object positions without requiring separate heating systems for each scenario.
3Measurement precision
If temperature sensors are placed only at coil centers, then the sensor placement is simple, but the highest temperature detection is inaccurate
Solution Approach 1:
The temperature detection is segmented into multiple measurement points: sensors at the center of each heating coil and additional sensors positioned between adjacent coils. This segmentation captures temperature variations across different regions, ensuring the highest temperature is accurately detected regardless of object position, while maintaining a systematic and manageable sensor placement pattern.
Solution Approach 2:
Multiple temperature sensors provide feedback about temperature distribution across different heating zones. This feedback enables the control system to identify the highest temperature region and adjust heating accordingly, improving detection accuracy. The feedback mechanism works with the segmented sensor placement to ensure comprehensive temperature monitoring without excessive complexity.
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 configuration allows for precise temperature detection and control, enhancing safety and cooking performance by identifying the hottest temperature areas and adapting heating coil operation, thus preventing abnormal heating and improving user flexibility in object placement.
Implementation Method 1
induction heating cooker including a top plate (3) placed on an upper surface of a main body (1)... a heating coil portion (4) having a plurality of heating coils (4a, 4b) and placed under the top plate (3)... controller (5) controlling a high-frequency electric current supplied to the heating coil portion (4)
Implementation Method 2
heating a to-be-heated object such as a single cooking pan with the plurality of the heating coils
Data Source
Figure 1
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AI summary
In heating coil portion (4), two heating coils (4a, 4b) are placed in such a way as to be arranged in the same plane. Heating coil portion (4) includes first temperature sensors (6a, 6b) provided near respective centers of heating coils (4a, 4b) and, further, includes second temperature sensor (7) provided between heating coils (4a, 4b), near a portion where heating coils (4a, 4b) come closest to each other. A controller is configured to detect a temperature with first temperature sensors (6a, 6b) and second temperature sensor (7) and to control heating.