Acoustic alarm, alarm circuit and circuit driving method thereof for fire-fighting site

Abstract

The invention discloses an acoustic alarm, an alarm circuit and a driving method thereof for a fire-fighting site. The alarm circuit comprises a fire-fighting two-bus, a rectification module, a powersupply module, a main control module, an acoustic power supply module, an acoustic driving module and a buzzer; the main control module is connected to the acoustic power supply module and the acoustic driving module; the sound driving module is connected to the buzzer; the main control module controls the power generation and supply module after receiving an alarm command from a fire-fighting bus, the power generation and supply module supplies power to the sound driving module, the main control module sends out a PWM signal with variable frequency to the sound driving module, and the sound driving module drives the buzzer to give out alarm sound with variable tone; and when the sound production power supply module does not start the sound alarm, the main control module controls the soundproduction power supply module to stop supplying power to the sound driving module. The alarm circuit and the sound alarm for the fire-fighting site can effectively reduce the sound-driven alarm power consumption.

Description

technical field [0001] The invention relates to an alarm device used in a fire-fighting scene, in particular to an acoustic alarm circuit, an alarm and a driving method used in a fire-fighting scene. Background technique [0002] At present, the existing sound (or sound and light) siren can be installed on the floor or in an independent fire zone. When a fire breaks out in the building, the main control module of the sound siren receives the alarm command and drives the buzzer to send out a strong fire alarm. Audible alarm signal to remind all personnel in the fire area to pay attention. [0003] At present, many sound alarms on the market have the following shortcomings: the sound power supply module driving the alarm circuit uses an inductor to supply power to the sound drive module, which consumes a lot of power and has unstable voltage fluctuations. The connection between the sound siren and the fire controller is complicated, and most of them are four-wire system. The...

AI Technical Summary

Problems solved by technology

[0003] At present, many sound alarms on the market have the following shortcomings: the sound power supply module driving the alarm circuit uses an inductor to supply power to the sound drive module, which consumes a lot of power and the voltage fluctuation is unstable

The connection between the sound siren and the fire controller is complicated, and most of them are four-wire system

The sound siren powered by two fire-fighting buses on the market, when multiple sound (or sound-light) sirens on the same fire-fighting two-bus alarm, the voltage of the fire-fighting bus fluctuates greatly, because the charging power consumption of the sound power supply module is large and unstable, Cause other devices on the same fire bus to fail to work normally

Images