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Circuit driving circuit of fire alarm system and corresponding fire alarm system

A technology for driving circuits and fire alarm systems, applied in the direction of electric fire alarms, alarms, measuring electrical variables, etc., can solve problems such as not being optimal

Active Publication Date: 2014-02-12
SIEMENS SWITZERLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering the requirements of the central control system 110 for power saving, this method is not optimal

Method used

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  • Circuit driving circuit of fire alarm system and corresponding fire alarm system
  • Circuit driving circuit of fire alarm system and corresponding fire alarm system
  • Circuit driving circuit of fire alarm system and corresponding fire alarm system

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Embodiment Construction

[0027] Fire alarm systems need to be compatible Figure 2A and Figure 2B Two types of fire detectors are shown, but the two types of fire detectors have different alarm voltages (for example, 5.6V and 12V respectively), and for Figure 2B The fire detector shown also requires a high current to maintain its alarm state, otherwise the fire detector will erroneously auto-reset. In view of this, the inventors of the present invention propose the concept of providing different line driving currents in the line monitoring phase and the alarming phase in the following embodiments. Specifically, in the line monitoring stage, a lower current is used to monitor whether the line is normal, and when an alarm is detected, a higher current is used to keep the alarm signal valid, so as to avoid false reset of the fire detector. This concept can support both types of fire detectors at the same time without pre-identifying the detector type. Moreover, this idea also achieves the purpose of...

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PUM

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Abstract

The invention provides a driving circuit and driving method for a fire alarm system. The driving circuit comprises a current generating circuit and a detection circuit, the current generating circuit can selectively provide a circuit with a first current IN1 or a second current IALARM, the first current IN1 is used as a circuit monitor current under a normal work station, and the second current IALARM is larger than the first current IN1. The detection circuit is used for controlling the current generating circuit to provide the circuit with the second current IALARM when a circuit voltage VLine on the circuit is detected to be lower than a threshold value Vth, and the threshold value Vth is lower than a normal circuit voltage and higher than the maximum alarm voltage indicated on the circuit when the fire alarm system gives an alarm.

Description

technical field [0001] The present invention generally relates to the field of fire alarm, in particular to a line drive circuit and a drive method in a fire alarm system. Background technique [0002] Automatic fire alarm system, referred to as fire alarm system, is an automatic fire-fighting facility installed in buildings or other places in order to detect and report fires early, and take effective measures in time, such as controlling and extinguishing fires. At present, most buildings, such as office buildings, hotels, and large shopping malls, are equipped with fire alarm systems. [0003] Figure 1A Schematically shows the general composition of the fire alarm system. like Figure 1A As shown, the fire alarm system 100 generally includes a central control system 110 and a plurality of fire detectors 120 and / or a plurality of manual alarms 130 connected to the central control system 110 through lines Line. Both the fire detector 120 and the manual alarm 130 transmit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B17/06G01R19/165
CPCG08B25/04G08B29/06
Inventor U·克斯特利逄红侯树春
Owner SIEMENS SWITZERLAND