Method of estimating temperature of content in electric pot and device thereof
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric pots struggle to quickly and accurately detect the temperature of water and other contents due to the indirect temperature detection method, which is influenced by the thermal resistance and material of the container.
Innovation Solution
A device and method that utilize a temperature estimation coefficient (Ce) to estimate the content temperature based on data from a temperature sensor measuring the heater temperature, without directly measuring the content temperature. The coefficient is determined using specific formulas and pulse voltage applications to the heater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If indirect temperature detection is used through the container bottom, then the temperature sensor can be easily installed, but the temperature detection speed is slow and accuracy is reduced
Solution Approach 1:
The patent introduces a temperature estimation coefficient as an intermediary parameter that bridges the heater temperature and content temperature. By measuring the heater temperature directly and using the pre-determined coefficient, the system indirectly obtains content temperature without physical contact delays, resolving the contradiction between easy installation and fast detection.
Solution Approach 2:
The temperature estimation coefficient is pre-determined through calibration before actual use. This preliminary action stores the relationship between heater and content temperatures, allowing rapid estimation during operation without real-time calibration, thus achieving both ease of manufacture and fast detection speed.
2Ease of manufacture
If indirect temperature detection is used through the container bottom, then the sensor installation is simplified, but the temperature measurement precision deteriorates
Solution Approach 1:
The system uses feedback by continuously monitoring heater temperature and applying the temperature estimation coefficient to calculate content temperature. This feedback mechanism compensates for the indirect measurement limitation, maintaining high precision while keeping the sensor installation simple on the heater surface.
Solution Approach 2:
The patent changes the measurement parameter from direct content temperature to heater temperature, which can be measured precisely and easily. By transforming the problem into measuring a different parameter (heater temperature) and using the pre-determined coefficient relationship, the system achieves high measurement precision with simplified installation.
3Measurement precision
If a temperature sensor directly measures content temperature, then the temperature detection accuracy is high, but the device complexity increases
Solution Approach 1:
The patent extracts the temperature measurement function from the content and relocates it to the heater. By placing the temperature sensor on the heater rather than in the content, the system achieves sufficient measurement precision while avoiding the complexity of direct content temperature sensing and the associated contamination or sterilization issues.
4Speed
If pulse voltage is applied to the heater for temperature estimation, then the content temperature can be rapidly estimated, but energy consumption increases
Solution Approach 1:
The system uses periodic pulse voltage application to the heater for temperature estimation rather than continuous heating. This periodic action allows rapid temperature estimation at specific intervals while reducing overall energy consumption compared to continuous operation, resolving the contradiction between speed and energy use.
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 and rapid estimation of the content temperature, overcoming the limitations of indirect temperature detection and improving the heating control accuracy.
Implementation Method 1
a power feeding stand 27 incorporating a power supply coil 13; the electric pot 28 incorporating a power reception coil 14 configured to receive an electricity from the power supply coil 13 in a non-contact manner
Implementation Method 2
a heater 18 provided with an electric pot 28... a power supply circuit 19 configured to supply the electricity to the heater 18
Data Source
AI summary
A device for heating a content by a heater incorporated in the device while receiving an electricity by a power reception coil provided with an electric pot from a power supply coil provided with a power feeding stand in a non-contact manner, the device further including: a power supply circuit configured to supply the electricity to the heater; a temperature sensor configured to detect the temperature of the heater; a controller for controlling an energization to the heater; a temperature storage unit for storing the temperature detected by the temperature sensor via the controller; a temperature estimation coefficient storage unit configured to store a temperature estimation coefficient Ce preliminarily and peculiarly set to the electric pot; and a temperature estimation unit configured to estimate the temperature of the content based on a data stored in the temperature storage unit and the temperature estimation coefficient Ce.