Loop Fire Alarm Booster for Signal Monitoring After Line Disconnection
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Solution Overview
Problem
The increased line resistance in loop transmission lines due to their longer length compared to normal transmission lines, which prevents effective signal transmission and reception with fire detectors beyond 30 ohms, leading to a loss of fire monitoring functionality when disconnection failures occur.
Innovation Solution
A booster is inserted in the middle of the loop transmission line, amplifying signals in one direction and switching directions upon disconnection, ensuring all fire detectors remain connected to the receiver even with disconnection failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a loop transmission line is used to ensure reliability against disconnection failure, then system reliability is improved, but line resistance increases due to longer length, causing signal transmission failure
Solution Approach 1:
The loop transmission line is divided into multiple segments by inserting booster devices at intermediate points. Each segment has reduced resistance, allowing signal transmission while maintaining the loop configuration for reliability. The booster acts as an intermediate relay that regenerates signals, effectively segmenting the long high-resistance line into shorter low-resistance sections.
Solution Approach 2:
The booster device serves as an intermediary element inserted into the loop transmission line. It receives signals from one direction, amplifies them, and transmits them in the opposite direction, mediating between the fire detectors and the control panel to overcome the harmful effect of high line resistance while preserving system reliability.
2Area of stationary object
If the transmission line length is increased to cover larger areas, then monitoring coverage is improved, but signal transmission quality deteriorates due to higher resistance
Solution Approach 1:
The long transmission line covering large areas is segmented into multiple shorter sections by placing boosters at strategic locations. Each section maintains acceptable signal quality with lower resistance, while the boosters regenerate and amplify signals to extend the overall coverage area without sacrificing transmission quality.
Solution Approach 2:
The booster device changes the electrical parameters of the transmission system by amplifying voltage and current levels. This parameter change compensates for the resistance losses in long transmission lines, enabling signal transmission over extended distances while maintaining transmission quality.
3Reliability
If a booster is added to amplify signals, then signal transmission is improved, but device complexity increases
Solution Approach 1:
The signal amplification function is extracted as a separate, standalone booster device that can be independently installed and maintained. This modular approach adds the necessary amplification capability without complicating the existing fire detector and control panel systems, maintaining simplicity while improving signal transmission.
4Reliability
If switching circuits are implemented to handle disconnection failures, then reliability is improved, but device complexity increases
Solution Approach 1:
The booster device incorporates automatic detection and switching capabilities that enable it to self-manage disconnection failures. When a disconnection is detected, the booster automatically switches to alternative signal paths or modes without requiring external control circuitry, thereby improving reliability while minimizing added complexity.
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 booster maintains fire monitoring functionality by amplifying signals in both directions as needed, ensuring reliable communication with all fire detectors despite disconnection failures, thereby enhancing system reliability.
Implementation Method 1
a booster inserted in the middle of the loop transmission line, amplifying signals in one direction and switching directions upon disconnection
Data Source
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AI summary
[Problem] A booster enables fire monitoring by all fire detectors upon a disconnection failure occurs in a loop transmission line provided in the middle. [Solution] A fire detector 18 is connected to a loop transmission line 12 connected to a receiver 10. When the loop transmission line12 is normal, connect a transmission unit22 to the fire detector18 to monitor the fire. Upon a disconnection failure occurs on the loop transmission line 12, the disconnection monitoring unit 28 turns on the switching circuits 30a and 30b to connect the end of the loop transmission line 12 to the transmission unit 22, and the receiver 10 connects to the fire detector 18 from both ends of the loop transmission line 12, and communicate to monitor fires. An input / output switching booster 16 is inserted and connected in the middle of the loop transmission line 12, and when the start side transmission line 12a is disconnected and the switching circuits 30a and 30b are turned on, the input / output is switched. As a result, the input / output switching booster 16 amplifies the down signal input from the terminal side transmission line 12b and outputs it to the start side transmission line 12a, and at the same time amplifies the up signal input from the start side transmission line 12a and outputs it to the terminal side transmission line 12b.