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PWM variable-frequency sound driving device for automatic fire alarm system and design method

A technology of automatic fire alarm and design method, which is applied in the direction of electric transmission signal system, sounding equipment, instruments, etc., can solve the problems of waste of resources, high cost of line laying, and impossibility of realization, so as to reduce product power consumption and reduce laying lines cost effect

Active Publication Date: 2021-04-30
QINGDAO DINGXIN COMM & FIRE FIGHTING SAFETY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, fire sound and light alarms in the fire automatic alarm system industry are generally four-wire system, two buses for communication between the controller and fire sound and light alarms, and two 24V power lines are used to supply power to fire sound and light alarms. The problem is: (1) the cost of laying the line is high, which brings a lot of material cost and labor cost to Party A and the construction party; Due to the low utilization rate of the sound frequency, it is impossible to achieve a large sound pressure level, resulting in a waste of resources and low power utilization.

Method used

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  • PWM variable-frequency sound driving device for automatic fire alarm system and design method
  • PWM variable-frequency sound driving device for automatic fire alarm system and design method
  • PWM variable-frequency sound driving device for automatic fire alarm system and design method

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Embodiment 1

[0043] Such as figure 1 As shown, the PWM frequency conversion driving sound design method for automatic fire alarm system of the present invention comprises the following steps:

[0044] Step 1: Determine the bus voltage of the automatic fire alarm system: the automatic fire alarm system uses the TC-BUS bus for communication and power supply, and obtains different voltages U of the automatic fire alarm system by detecting the voltage of the TC-BUS bus in real time;

[0045] Step 2: Calculate the PWM duty cycle according to the bus voltage D: To keep the sound alarm effect consistent, under different voltage conditions, it is necessary to ensure that the charging energy of the inductor is consistent, including the following small steps:

[0046] Step 1: Calculate the resonant frequency point: According to the resonant frequency point calculated by the buzzer and inductance of the automatic fire alarm system, deduce the designed frequency according to the maximum frequency of t...

Embodiment 2

[0072] Such as Figure 7 As shown, the PWM frequency conversion sound driving device for an automatic fire alarm system according to the present invention includes a single-chip microcomputer, a drive circuit and a buzzer, and the single-chip microcomputer outputs a PWM drive signal to control the buzzer through the drive circuit, wherein:

[0073] The single-chip microcomputer controls the oscillation of the drive circuit and generates a PWM-driven LC oscillation signal and a noise reduction control signal at both ends of the buzzer, so that a voltage difference is generated at both ends of the buzzer to drive the sound with frequency conversion.

[0074] The PWM driving signal drives the buzzer chip to make a sound, and the IO port of the single-chip microcomputer outputs the PWM driving signal to match the sound driving circuit, and controls the MOS tube switch through the IO, thereby realizing the driving control of the buzzer. When the frequency of the PWM driving signal ...

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Abstract

The invention relates to a PWM variable-frequency sound driving device for an automatic fire alarm system and a design method, and belongs to the technical field of automatic fire alarm systems. The method comprises the following steps: 1, determining a bus voltage of an automatic fire alarm system, wherein the automatic fire alarm system adopts a TC-BUS bus for communication and power supply; 2, calculating a PWM duty ratio D according to the bus voltage; and 3, controlling PWM frequency conversion sound driving: the sound of the sound alarm uses a low duty ratio at a low frequency and uses a high duty ratio at a high frequency, the average current in the whole frequency modulation period is reduced, and high decibel is realized at a high frequency. According to the two-wire system low-power-consumption high-decibel acousto-optic alarm, a 24V power source does not need to be laid independently, the line laying cost is reduced, meanwhile, the product power consumption is reduced while the high-decibel sound pressure level is achieved through the variable-frequency sound driving design, and overload cannot be caused to a fire-fighting fire alarm system.

Description

technical field [0001] The invention relates to a PWM frequency conversion sound driving device and a design method for an automatic fire alarm system, belonging to the technical field of automatic fire alarm systems. Background technique [0002] The automatic fire alarm system is generally composed of fire detectors, regional alarms and centralized alarms; it can also be linked with various fire extinguishing facilities and communication devices according to project requirements to form a central control system; it is mainly used for early detection and notification of fires, and Take effective measures in time to control and extinguish the fire. At present, fire sound and light alarms in the fire automatic alarm system industry are generally four-wire system, two buses for communication between the controller and fire sound and light alarms, and two 24V power lines are used to supply power to fire sound and light alarms. The problem is: (1) the cost of laying the line is...

Claims

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Application Information

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IPC IPC(8): G10K9/12G08B7/06
CPCG10K9/12G08B7/06
Inventor 不公告发明人
Owner QINGDAO DINGXIN COMM & FIRE FIGHTING SAFETY CO LTD
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