Temperature Slew-Rate Circuit for Rapid Thermal Change Detection
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Solution Overview
Problem
Conventional temperature monitoring methods in temperature-sensitive components are inadequate for rapid temperature change detection, leading to potential damage due to the time gap between sampling and processing analog values, which increases processing load on host devices.
Innovation Solution
A circuit incorporating a latch register, subtraction, timing, and division circuits to determine the slew rate of temperature changes, allowing for timely alerts without excessive processing load on the host device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the host device samples and processes temperature values using conventional methods, then the temperature monitoring is performed, but the time gap between sampling and processing allows temperature to rise harmfully
Solution Approach 1:
The patent applies preliminary action by calculating the slew rate (rate of temperature change) in advance and comparing it against threshold values before the actual high temperature condition occurs. This allows the system to predict imminent temperature dangers and trigger protective actions earlier, eliminating the harmful time delay between temperature rise detection and protective response.
2Measurement precision
If the host device continuously monitors temperature with high frequency sampling, then rapid temperature changes are detected, but the processing load on the host device becomes excessive
Solution Approach 1:
The patent extracts the computationally intensive temperature monitoring and slew rate calculation functions from the host device and implements them in dedicated hardware circuitry. This separation removes the processing burden from the host device while maintaining high-precision temperature change detection, as the hardware circuit continuously calculates temperature differences and slew rates without requiring host intervention.
Solution Approach 2:
The monitoring circuit operates autonomously to calculate slew rates and generate alerts without requiring continuous host device involvement. The circuit self-manages the temperature sampling, differential calculation, threshold comparison, and alert generation, thereby reducing processing load on the host device while maintaining continuous monitoring capability.
Data Source
AI summary
An example apparatus includes: a temperature sensor including a temperature output, a register including an input and an output, the input coupled to the temperature output, a subtraction circuit including a first subtraction input, a second subtraction input, and a subtraction output, the first subtraction input coupled to the input of the register, the second subtraction input coupled to the output of the register, a timing circuit including a cycle time input, a shift output, and a direction output, and a division circuit including a division input, a shift input, a direction input, and a divided output, the division input coupled to the subtraction output, the shift input coupled to the shift output, the direction input coupled to the direction output.