Electronic Circuit Temperature Prediction Using Thermistor Slope Analysis
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Solution Overview
Problem
Conventional methods for managing electronic circuit temperatures fail to effectively predict and prevent overheating, leading to thermal runaway and potential circuit failures due to the lack of consideration for heat capacity in components, resulting in delayed user actions and increased fire risks.
Innovation Solution
A method involving a detection unit with thermistors and a control/alarm unit that compares the slope of the maximum acceptable voltage to the current voltage slope, using a low pass filter and microcomputer to predict temperature variations and manage heating by dividing voltage sections and measuring slopes, allowing for proactive warnings and power cutoffs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional temperature measurement methods are used to detect overheating, then the system can identify when temperature reaches a set rated temperature value, but the system fails to predict thermal runaway in advance and cannot prevent circuit failure due to delayed user response
Solution Approach 1:
The patent applies preliminary action by predicting future temperature based on current temperature and its rate of change (dT/dt). The system calculates predicted temperature Tp = T + (dT/dt) × Δt before thermal runaway occurs, enabling early warning and preventive action rather than waiting for temperature to reach dangerous levels.
Solution Approach 2:
The patent applies dynamics by continuously monitoring the rate of temperature change (dT/dt) and using this dynamic parameter to predict future temperature states. The system adapts to varying heating rates and adjusts predictions based on real-time temperature dynamics rather than relying on static threshold values.
2Device complexity
If simple temperature threshold detection is implemented, then the system structure remains simple, but the system cannot effectively prevent overheating caused by components with large heat capacity continuing to emit stored heat
Solution Approach 1:
The patent predicts future temperature states before thermal runaway occurs by calculating Tp = T + (dT/dt) × Δt. This preliminary prediction enables the system to take preventive action when the predicted temperature exceeds safety thresholds, rather than waiting for actual overheating to occur.
Solution Approach 2:
The patent implements feedback by continuously monitoring temperature T and its rate of change dT/dt, comparing predicted temperature against safety thresholds, and adjusting control actions based on this feedback loop. The system uses feedback to dynamically adjust heating control decisions.
3Measurement precision
If the system waits for temperature to reach rated value before taking action, then detection is straightforward, but thermal runaway occurs before user action can be taken
Solution Approach 1:
The patent calculates predicted temperature Tp = T + (dT/dt) × Δt to determine future temperature states before thermal runaway occurs. This preliminary calculation provides advance warning time, enabling users to take preventive action before temperature reaches dangerous levels.
Solution Approach 2:
The patent uses the dynamic parameter dT/dt (rate of temperature change) to predict future temperature states. By incorporating the time derivative of temperature, the system can forecast thermal runaway timing and provide early warning rather than waiting for static threshold crossing.
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 approach enables early detection of abnormal heating, preventing thermal runaway and ensuring proactive measures to prevent safety accidents such as fires by accurately assessing temperature variation rates and managing heat dissipation.
Implementation Method 1
the electrical circuit unit includes one or more thermistors, and the detection unit performs a maximum acceptable voltage setting operation
Implementation Method 2
using a low pass filter and microcomputer to predict temperature variations
Implementation Method 3
All kinds of electrical and electronic components and circuits (hereinafter, collectively referred to 'circuits') using electrical energy inevitably generate Joule heating which is proportional to a square value of an electrical current or a voltage
Data Source
AI summary
Provided is a method for predicting and managing the temperature of an electronic circuit, which can trigger an alarm, block, or control by predicting in advance a temperature rise result due to heat before heat generation of the electronic circuit and components increases up to a risk level. The temperature prediction and management method is a method for predicting and managing the temperature of an electrical circuit unit including one or more circuits or components including: a detection unit for predicting and managing the heat of the electrical circuit unit; and a control/alarm unit for providing control or an alarm to the electrical circuit unit according to the operation of the detection unit, wherein the electrical circuit unit includes one or more thermistors, and the detection unit senses whether or not the electrical circuit unit is abnormally heated.