Protection Circuit Timer Fuse Burnout Glitch Immunity
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Solution Overview
Problem
Conventional battery protection apparatuses are prone to frequent suspension and deterioration of fuse robustness due to voltage glitches, leading to frequent replacement needs, as they often suspend protection processes before the fuse is completely burnt.
Innovation Solution
A protection circuit with a detection block, a timer, and a protection enable block that generates an enabling signal for a second predetermined duration, allowing a fuse to be completely burnt and ensuring continuous protection against undesired conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protection apparatus uses a conventional detection block and protection enable block without a timer, then the response speed is fast, but the fuse robustness deteriorates due to frequent suspension of protection process
Solution Approach 1:
A timer circuit is introduced as an intermediary component between the detection block and protection enable block. The timer receives the alert signal and generates an enabling signal with a predetermined duration, mediating the protection process to ensure it completes fully without suspension, thereby improving fuse robustness while maintaining reasonable circuit complexity
Solution Approach 2:
The timer circuit performs preliminary action by pre-determining the duration of the enabling signal before the protection process actually occurs. This ensures that the protection process has sufficient time to complete the fuse burning operation without being suspended by subsequent voltage glitches, as the enabling signal duration is established in advance
2Reliability
If the protection process is suspended before the fuse is completely burnt, then the voltage glitch detection is responsive, but the fuse needs frequent replacement
Solution Approach 1:
The timer circuit ensures continuity of useful action by generating an enabling signal that maintains the protection process activation for a predetermined duration. This continuous activation prevents suspension of the protection process even when voltage glitches occur after the initial alert, ensuring the fuse is completely burnt and the protection action is completed without interruption
Solution Approach 2:
The timer provides beforehand cushioning by establishing a predetermined time buffer through the enabling signal duration. This time cushion allows the protection process to complete the fuse burning operation even if voltage fluctuations occur during the process, preventing premature suspension and reducing the need for frequent fuse replacements
Data Source
AI summary
A protection circuit includes a detection block, a timer and a protection enable block. The detection block is used to compare a monitoring signal with a reference signal and generate an alert signal if a difference between the monitoring signal and the reference signal exceeds a threshold for a first predetermined duration. The timer coupled to the detection block is used to generate an enabling signal for a second predetermined duration in response to the alert signal. The protection enable block coupled to the timer is used to generate a triggering signal for a first time duration determined by the second predetermined duration in response to the enabling signal so as to perform a protection function.