Alarm Sounding Component State Detection via Capacitance Sampling
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Solution Overview
Problem
Alarm sounding components, such as buzzers, in fire alarm systems are prone to faults like open circuits and short circuits due to aging or manufacturing issues, making it difficult to ensure long-term reliability and timely detection of these faults.
Innovation Solution
A state detection device is introduced, comprising a detection circuit that applies a pulse voltage signal to the alarm sounding component, a sampling circuit to capture feedback, and a controller to analyze the sampled signal for fault conditions, allowing for quick and accurate detection of normal, open circuit, or short circuit states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If alarm sounding component is used for long time, then it provides continuous alarm function, but fault conditions occur due to aging and wear
Solution Approach 1:
The detection circuit performs preliminary detection of the alarm sounding component's state before actual fault occurrence. By continuously monitoring the equivalent load capacitor through sampling circuits, the system identifies potential failures (open circuit, short circuit, abnormal capacitance) in advance, allowing preventive maintenance before the component actually fails during long-term service.
2Measurement precision
If detection circuit is added to monitor alarm sounding component, then fault detection accuracy is improved, but device complexity increases
Solution Approach 1:
The detection circuit is designed with multi-functionality to reduce overall system complexity. The same detection circuit can identify multiple fault types (open circuit, short circuit, abnormal capacitance values) using a unified detection mechanism. The sampling circuit can operate in different modes (different sampling periods) depending on the detected conditions, making the circuit adaptable to various scenarios without requiring separate dedicated circuits for each fault type.
Solution Approach 2:
The equivalent load capacitor serves as an intermediary element that simplifies the detection process. Instead of directly monitoring multiple parameters of the alarm sounding component, the system uses the equivalent load capacitor as a mediator to indirectly detect component state. The sampling circuit only needs to monitor the voltage across this single capacitor, converting complex component diagnostics into a simple voltage sampling task.
3Reliability
If continuous monitoring is performed on alarm sounding component, then reliability is improved, but energy consumption increases
Solution Approach 1:
The detection circuit employs periodic sampling instead of continuous monitoring. The sampling circuit operates at predetermined sampling periods, actively sampling the equivalent load capacitor voltage at intervals rather than continuously. This periodic action maintains reliable fault detection capability while significantly reducing energy consumption compared to continuous monitoring, as the detection circuit remains inactive between sampling intervals.
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 enables timely and accurate detection of faults in alarm sounding components, enhancing the reliability of fire alarm systems by continuously monitoring the components and providing real-time fault information for maintenance.
Implementation Method 1
a detection circuit for applying a detection signal to control detection of an equivalent load capacitor of the alarm sounding component that is capacitive
Data Source
AI summary
The invention belongs to the technical field of alarm sounding component, and relates to state detection of an alarm sounding component. The invention provides a state detection device of an alarm sounding component, comprising: a detection circuit for applying a detection signal to control detection of an equivalent load capacitor of the alarm sounding component that is capacitive; a sampling circuit for sampling feedback information of the equivalent load capacitor of the alarm sounding component when a signal of the detection signal is applied to the alarm sounding component to obtain a sampled signal; and a controller for generating the detection signal, and analyzing and processing the sampled signal to obtain state information which can reflect a fault condition of the alarm sounding component.