Electric Kettle Dry-Burn Control Using Temperature Rate Detection
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Solution Overview
Problem
Conventional electric kettles are prone to 'dry' burn due to weak temperature sensitivity of fuse breakers and delayed activation of dual metal switches, leading to premature burning of components before power is cut off when the heating point is operated without water.
Innovation Solution
A method incorporating a temperature sensor, microprocessor, and control circuit to accurately detect water temperature rate and acceleration changes, sending control signals to cut off heating power when thresholds are exceeded, thereby preventing 'dry' burns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse breaker is used to protect the heating point from dry burn, then the control circuit can cut off power, but the temperature sensitivity is too weak and other components burn before power is cut off
Solution Approach 1:
The patent replaces the mechanical fuse breaker system with a microprocessor-based electronic control system. The microprocessor continuously monitors temperature data from sensors and uses algorithmic processing to detect abnormal heating patterns, substituting mechanical temperature sensing with electronic measurement and computational analysis for superior temperature sensitivity and earlier detection of dry-burn conditions
Solution Approach 2:
The patent implements a feedback control system where the microprocessor continuously receives temperature data from sensors, processes the information through algorithms, and adjusts the heating element operation accordingly. This closed-loop feedback enables real-time monitoring and immediate response to abnormal temperature increases, providing both early detection and dynamic control to prevent component damage
2Reliability
If a dual metal switch is used to cut off power when heating point is dry, then the switch can protect components, but the triggering time is too long before activation
Solution Approach 1:
The patent applies preliminary action by continuously monitoring temperature before dangerous conditions develop. The microprocessor system proactively detects abnormal heating trends and predicts potential dry-burn conditions before they occur, allowing the control system to take preventive action by cutting off power before the heating element reaches damaging temperatures, rather than waiting for a threshold to be exceeded
Solution Approach 2:
The patent replaces the slow thermal-mechanical dual metal switch with an electronic sensing and control system. Temperature sensors provide immediate electrical signals to the microprocessor, which processes the data and controls the heating element through electronic switching. This substitution eliminates the inherent thermal inertia and mechanical delay of bimetallic switches, achieving near-instantaneous detection and response
3Measurement precision
If conventional temperature sensing is used, then the system can detect temperature, but the response is too slow to prevent burning before power cutoff
Solution Approach 1:
The patent replaces conventional thermal sensing mechanisms with electronic temperature sensors and digital processing. The sensors convert temperature changes directly into electrical signals that are immediately processed by the microprocessor, eliminating the thermal mass and response delay inherent in mechanical temperature sensing systems. This enables both high measurement precision and fast response speed simultaneously
Solution Approach 2:
The patent implements periodic temperature sampling at high frequency, with the microprocessor continuously reading sensor data at predetermined time intervals. This periodic measurement approach, combined with algorithmic analysis of temperature trends and rates of change, enables the system to detect abnormal heating patterns early and respond before dangerous conditions develop, achieving both accurate measurement and rapid response
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 and accurately determines water temperature changes to prevent 'dry' burns by cutting off heating power promptly, enhancing the safety and reliability of electric kettles compared to traditional methods.
Implementation Method 1
detecting the water temperature in the electric kettle via the temperature sensor
Data Source
AI summary
A method of controlling an electric kettle for “dry” burn prevention during heating process, including the steps of: providing a temperature sensor, a microprocessor, and a control circuit; detecting the water temperature; determining the temperature rate change and comparing the temperature rate change with the rate change threshold; and when the temperature rate change is larger than the preset rate change threshold, sending a control signal to the control circuit. The microprocessor determines the temperature rate change and the acceleration rate change that when the temperature rate change and acceleration rate change are larger than the corresponding thresholds respectively, the microprocessor sends the control signal to the control circuit to stop the heating process. Therefore, the present invention accurately determines the increasing temperature of the water and simultaneously cuts off the heating power to prevent the electric kettle from being burnt.