Dynamic Fuse Threshold Control for Overcurrent Protection
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Solution Overview
Problem
Existing overcurrent protection devices, such as fuses and contactors, are prone to unnecessary activation due to external factors like temperature and age, leading to potential damage to electronic loads and operators, and suffer from delays in responding to overcurrent events, resulting in 'let-through fault energy' that degrades fuses and causes damage.
Innovation Solution
An electric circuit protection system comprising a control module and sensors that monitor degradation factors and energy parameters to dynamically adjust the energy threshold of fuses, allowing the system to proactively open the circuit before the fuse blows, thereby preventing damage and reducing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse with a fixed energy threshold value is used to protect the load, then the load is protected from overcurrents exceeding the threshold, but the fuse may unnecessarily blow at overcurrents that are low enough for the load to safely withstand due to external factors like temperature and age
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed energy threshold fuse to a system with dynamically adjustable energy thresholds. The control module continuously monitors degradation factors (temperature, age, usage history) and adjusts the energy threshold accordingly, allowing the protection level to adapt in real-time to changing conditions rather than remaining static
Solution Approach 2:
The patent implements feedback by using sensors to continuously monitor the actual conditions of the fuse and load, then feeding this information back to the control module. The control module uses this feedback to adjust the energy threshold and control the switching device, creating a closed-loop system that responds to actual system state rather than relying on predetermined fixed values
2Reliability
If a contactor is used to open the circuit when current exceeds a threshold, then overcurrent protection is provided, but the contactor has a response time delay that allows let-through fault energy to flow through the circuit causing damage
Solution Approach 1:
The patent replaces the mechanical contactor system with an electronic control system. Instead of relying on mechanical contacts that have inherent response delays, the system uses electronic sensors to detect overcurrent conditions and electronic switching devices (such as transistors or thyristors) that can open the circuit much faster, eliminating the mechanical response time limitation
Solution Approach 2:
The patent applies preliminary action by continuously monitoring current levels and preparing to open the circuit before dangerous let-through energy can occur. The control module anticipates potential overcurrent events by monitoring trends and is ready to act immediately when thresholds are approached, rather than waiting for the mechanical contactor to react after the fact
3Reliability
If a fuse is located in a difficult location to reach, then the circuit protection function is maintained, but significant downtime is required to replace the blown fuse
Solution Approach 1:
The patent applies self-service by implementing a system that automatically monitors, detects, and responds to overcurrent conditions without human intervention. The control module continuously checks system parameters, and when a problem is detected, the system automatically opens the circuit and can even provide diagnostic information, eliminating the need for manual fuse inspection and replacement
Solution Approach 2:
The patent introduces an intermediary control module and electronic switching device between the power source and load that can open the circuit remotely. This intermediary system allows the circuit to be opened and closed without physically accessing the fuse location, enabling remote diagnostics and maintenance while preserving the protective function
Data Source
AI summary
An electric circuit protection system includes a control module and a circuit sensor communicatively coupled with the control module. The control module is communicatively coupled with a switch that is joined with a circuit having a power source and a fuse. The control module is configured to monitor a degradation factor related to an energy threshold value of the fuse and direct the switch to open the circuit to prevent the power source from supplying current through the fuse. The circuit sensor is configured to measure an energy parameter of the current supplied by the power source through the circuit or that is demanded by a load from the power source. The control module is configured to direct the switch to open the circuit based on the energy threshold value and the energy parameter.