Power Controller Fusible Link Rapid Fault Isolation
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Solution Overview
Problem
Semiconductor devices used for over-current protection, such as FETs, can fail and cause uncontrolled current flow, leading to damage to wiring and loads due to their inability to rapidly respond to faults and prevent excessive current.
Innovation Solution
A power control system incorporating a fusible link and a heating element controller that monitors current flow and generates heat to rapidly fuse the fusible link when a fault is detected, using a circuit trace with a repeating pattern to concentrate heat and prevent current flow to the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semiconductor device (FET) is used for over-current protection, then current control capability is improved, but response speed to faults deteriorates
Solution Approach 1:
The protection system is segmented into two functional parts: a semiconductor device for current control and a fusible link for rapid fault isolation. The fusible link acts as a separate, dedicated failure containment mechanism that operates independently of the semiconductor device's response time, thereby resolving the contradiction between maintaining protection capability and achieving fast fault response.
Solution Approach 2:
The fusible link serves as an intermediary element between the semiconductor device and the load. When the semiconductor device fails, the fusible link intercepts the excessive current and melts to open the circuit, preventing damage to the load. This intermediary mechanism enables the system to maintain both protection reliability and fast response without requiring the semiconductor device itself to respond rapidly to faults.
2Reliability
If a fusible link is added to the power control system, then fault protection capability is improved, but device complexity increases
Solution Approach 1:
The fusible link is merged with the existing circuit traces on the printed circuit board, utilizing the same conductive pathways and mounting structure. This integration approach adds the protection function without requiring separate components or additional structural elements, thereby minimizing the increase in device complexity while maintaining improved fault protection capability.
Solution Approach 2:
The circuit traces serve dual functions: normally conducting operational current and during faults, serving as the fusible link for protection. This multi-functionality eliminates the need for dedicated separate fusible link components, reducing overall system complexity while achieving enhanced fault protection.
3Temperature
If heating element with repeating pattern is used, then heat concentration on fusible link is improved, but manufacturing complexity increases
Solution Approach 1:
The repeating pattern of the heating element is designed to be self-aligning and self-regulating during the manufacturing process. The pattern's geometric characteristics enable automatic alignment with the fusible link position, eliminating the need for complex alignment procedures or precision adjustments, thereby achieving good heat concentration without significantly increasing manufacturing complexity.
Solution Approach 2:
The heating element's repeating pattern allows for standardized fabrication parameters to be used across the entire element. By maintaining consistent trace width, spacing, and geometry throughout the pattern, the manufacturing process can use uniform parameters, simplifying fabrication while still achieving the desired heat concentration effect at the fusible link location.
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
The system effectively and rapidly responds to faults by melting the fusible link, preventing further current flow and protecting the load from damage, thereby enhancing the reliability of over-current protection.
Implementation Method 1
the heating element is configured to generate sufficient heat to fuse the fusible link within a predetermined time period when current flows through the heating element
Implementation Method 2
the heating element is configured to generate sufficient heat to fuse the fusible link within a predetermined time period
Data Source
AI summary
The present invention relates to a power control system with a fusible link. In one embodiment, the invention relates to a power control system, having a device possessing an output, a fusible link connected to the output of the device, a heating element controller, and at least one heating element connected to the heating element controller, where the heating element controller is configured to control the flow of current through the heating element, where the heating element controller is configured to monitor activity of the device, and where the heating element is configured to generate sufficient heat to fuse the fusible link within a predetermined time period when current flows through the heating element.