Active Line Terminator Module for Fire Alarm Wire Break Detection
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Solution Overview
Problem
Conventional methods for monitoring fire alarm lines struggle to reliably detect wire breaks due to fluctuations in quiescent current caused by pulsating detector consumption, making it difficult to meet new standards and resulting in a range where faults are not displayed, and existing solutions rely on voltage evaluation rather than current.
Innovation Solution
An active line termination module with a constant current sink, intelligent electronic module, and indicator light is used to monitor line impedance, allowing for reliable wire break detection independent of voltage, with the ability to be retrofitted into existing systems by being plugged into a signaling base or integrated into a fire detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional monitoring current method is used, then the system is simple to operate, but wire break detection reliability deteriorates due to quiescent current fluctuations
Solution Approach 1:
The patent changes the monitoring parameter from voltage-based evaluation to current-based evaluation. By using a constant current sink and measuring current changes directly, the system achieves more reliable wire break detection independent of voltage fluctuations and detector consumption variations.
Solution Approach 2:
The patent replaces the conventional voltage evaluation method with a current sink-based monitoring system. This substitution eliminates the sensitivity to voltage variations and detector pulsating current consumption, providing stable and reliable fault detection.
2Measurement precision
If line impedance is increased to meet maximum values, then detection sensitivity improves, but false fault messages increase due to quiescent current reduction
Solution Approach 1:
The patent implements a feedback mechanism where the constant current sink continuously monitors the line impedance by measuring the current flow. The system compares the measured current against threshold values and provides feedback to the control panel, enabling accurate distinction between normal impedance variations and actual wire breaks.
Solution Approach 2:
The patent uses a dynamic monitoring approach where the constant current sink actively adjusts and measures current flow in real-time. This dynamic measurement allows the system to adapt to varying line conditions while maintaining accurate fault detection, unlike static voltage-based methods.
3Ease of manufacture
If voltage evaluation method is used, then the system is easy to manufacture, but fault detection capability deteriorates in high impedance ranges
Solution Approach 1:
The patent creates a universal monitoring solution that works across all line impedance ranges (from low to high impedance conditions). The constant current sink-based system provides multi-functional capability, detecting both wire breaks and high impedance faults reliably, unlike voltage evaluation methods that fail in high impedance ranges.
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 solution ensures reliable fault detection across all resistance ranges, providing visual indication of operation status and increasing system reliability by evaluating line impedance through constant current sink control, thus meeting stringent standards and improving fault evaluation.
Implementation Method 1
monitoring a line impedance of electrical systems
Implementation Method 2
constant current sink with an indicator light
Data Source
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AI summary
The invention relates to an active line termination module (1) for monitoring a line impedance of electrical installations, in particular for use at the end of fire alarm lines, wherein a constant current sink (4) with indicator light, a voltage regulator (6) and an intelligent electronic component are arranged between the lines to be monitored such that the intelligent electronic component is connected to the constant current sink (4) by means of a line (7).