Overtemperature Detection Circuit With Time-Threshold Protection
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Solution Overview
Problem
Overtemperature operations can damage or reduce the lifetime of electronic devices, particularly semiconductor devices, due to differing temperature thresholds and material properties, necessitating improved overtemperature protection that accounts for ruggedness against high temperatures over limited time periods.
Innovation Solution
A method and circuit for overtemperature protection that monitors temperature and time of exceedance, declaring an overtemperature condition if the time exceeds a predetermined threshold, allowing for temperature thresholds tailored to specific materials and enabling safe state activation or cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional overtemperature protection is implemented with a fixed temperature threshold, then device reliability is improved, but the operational range is reduced because materials can withstand high temperatures for limited time periods
Solution Approach 1:
The patent transforms the static temperature threshold into a dynamic protection mechanism by introducing time as a variable. The evaluation circuit dynamically assesses whether the temperature threshold has been exceeded for a duration longer than a predetermined time threshold, allowing the protection level to adapt based on the temporal characteristics of temperature exceedance rather than using a fixed threshold approach
Solution Approach 2:
The patent changes the protection criterion from a single temperature parameter to a combined temperature-time parameter. By monitoring both the temperature threshold exceedance and the duration of such exceedance, the system creates a new protective parameter that reflects the cumulative thermal stress on different materials, enabling extended operational ranges while maintaining reliability
2Reliability
If a low temperature threshold is set to protect temperature-sensitive materials, then reliability is improved, but productivity is reduced due to premature shutdowns during short-term high-temperature operations
Solution Approach 1:
The system dynamically evaluates temperature exceedance events by comparing both the temperature threshold and the duration of exceedance against a time threshold. This dynamic assessment allows short-term temperature spikes that do not exceed the time threshold to continue operation, while only triggering protection when the cumulative exposure becomes dangerous, thus maintaining productivity while ensuring material protection
Solution Approach 2:
The evaluation circuit is pre-configured with knowledge of material thermal tolerances encoded in the time threshold parameter. This preliminary setup allows the system to anticipate safe operating boundaries without requiring real-time material analysis, enabling continuous operation within safe limits while automatically triggering protection before damage occurs
Data Source
AI summary
A method for overtemperature protection of an electronic device (112) is presented. The method comprises:a) monitoring a temperature of at least a part of the electronic device (112);b) if the temperature exceeds a temperature threshold, starting to monitor a time of temperature exceedance; andc) if the time of temperature exceedance exceeds a time threshold, declaring an overtemperature condition of the electronic device (112).Further, an overtemperature detection circuit (110) and a use of the overtemperature detection circuit (110) and the method for overtemperature protection are presented.