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

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 high cost of line laying, waste of resources, high material cost and labor cost, and reduce the cost of laying lines , The effect of reducing product power consumption

Active Publication Date: 2022-07-26
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 and design method for automatic fire alarm system
  • PWM variable frequency sound driving device and design method for automatic fire alarm system
  • PWM variable frequency sound driving device and design method for automatic fire alarm system

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Effect test

Embodiment 1

[0043] like figure 1 As shown, the PWM variable frequency drive sound design method for automatic fire alarm system according to 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 TC-BUS bus voltage in real time;

[0045] Step 2: Calculate the PWM duty cycle D according to the bus voltage: 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 resonance frequency: According to the resonance frequency calculated by the buzzer and inductance of the automatic fire alarm system, the designed frequency is reversed according to the maximum frequency of the resonan...

Embodiment 2

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

[0073] The single-chip microcomputer controls the drive circuit to oscillate and generates PWM drive LC oscillation signal and noise reduction control signal at both ends of the buzzer, so that the two ends of the buzzer generate a pressure difference to drive the sound by frequency conversion.

[0074] The PWM driving signal drives the buzzer chip to emit sound, and the IO port of the single-chip microcomputer outputs the PWM driving signal and 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 drive signal changes, the sound of the b...

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Abstract

The invention relates to a PWM variable frequency sound driving device and a design method for an automatic fire alarm system, and belongs to the technical field of automatic fire alarm systems for fire fighting. The invention includes the following steps: 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; step 2: calculate the PWM duty ratio D according to the bus voltage; step 3: control the PWM Variable frequency drive sound: The sound of the sound alarm uses a low duty cycle at low frequencies and a high duty cycle at high frequencies, pulling down the average current in the entire FM cycle and achieving high decibels at high frequencies. The present invention is a two-wire low power consumption high decibel sound and light alarm, which does not need to lay a 24V power supply separately to reduce the cost of laying lines, and at the same time adopts the variable frequency drive sound design to reduce the power consumption of the product while achieving high decibel sound pressure level. The fire alarm system is overloaded.

Description

technical field [0001] The invention relates to a PWM variable frequency sound driving device and a design method for an automatic fire alarm system, and belongs to the technical field of an automatic fire alarm system for fire fighting. 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 the requirements of the project to form a central control system; it is mainly used for early detection and notification of fires. Take timely and effective measures to control and extinguish the fire. At present, the fire sound and light alarm in the fire automatic alarm system industry is generally a four-wire system, with two buses for communication between the controller and the fire sound and light alarm, and two 24V power lines for powering the fire sound and light alarm. The problems are: (1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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