Sound base and fire alarm system

Abstract

The utility model relates to the technical field of fire-fighting equipment, in particular to a sound base, which comprises an optocoupler switch circuit, an MCU (Microprogrammed Control Unit) module and a sound output circuit, the optocoupler switch circuit and the sound output circuit are both electrically connected with the MCU module. The optocoupler switch circuit is electrically connected with the detector and is used for detecting the alarm state of the detector and sending a signal to the MCU module when detecting that the detector gives an alarm; the MCU module is used for outputting a corresponding PWM wave to the sound output circuit when receiving the signal; and the sound output circuit is used for outputting sound according to the PWM wave. The problem that the capacity of a bus type alarm is limited is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fire fighting equipment technique field more specifically, relate to a sound base. BACKGROUND

[0002] At present, the sound and light alarm of traditional fire alarm system is generally installed in the corridor and other public areas, but in some closed, sound insulation effect is good space, for example, hotel, family and other closed place, its alarm sound propagation and detection may be limited.

[0003] In the related prior art, the alarm is mostly bus type, and the bus type sound alarm is usually controlled by a fire alarm controller or a fire linkage controller.When a fire or other emergency occurs, the fire alarm controller will receive the corresponding signal and determine whether the sound alarm needs to be started according to the preset logic.

[0004] In the above related technology, when the detector and the alarm are both bus type, with the increase of the number of connected alarms, the communication load on the bus will also increase. Each bus system has its specific capacity limit, when the device capacity exceeds this limit, the bus may not work normally, resulting in communication failure, affecting the stability and reliability of the signal, and a sound base for reducing the bus alarm load is needed. UTILITY MODEL CONTENTS

[0005] The utility model discloses a sound base and fire alarm system to solve the problem that the capacity of bus type alarm is limited, and aims at the above defects of prior art.

[0006] In the first aspect, the application provides a sound base using the following technical scheme:

[0007] A sound base includes an opto-coupler switching circuit, an MCU module and a sound output circuit; the opto-coupler switching circuit and the sound output circuit are electrically connected with the MCU module;

[0008] The opto-coupler switching circuit is electrically connected with the detector, used for detecting the alarm state of the detector, and sending a signal to the MCU module when detecting the alarm of the detector;

[0009] The MCU module is used for outputting a corresponding PWM wave to the sound output circuit when receiving the signal;

[0010] The sound output circuit is used for outputting sound according to the PWM wave.

[0011] Preferably, the opto-coupler switching circuit includes a RemoteLED+ pin and a RemoteLED- pin for connecting with the ports of the detector, the RemoteLED+ pin leading out a capacitor C26, the RemoteLED- pin leading out a capacitor C27, and the capacitor C26 and the capacitor C27 being grounded;

[0012] The opto-coupler switching circuit further includes diodes D6, D7, D8 and D9, the anodes of the diodes D6 and D7 being connected between the capacitor C26 and the capacitor C27, the cathode of the diode D7 and the anode of the diode D8 being connected to the RemoteLED+ pin, the anode of the diode D9 and the cathode of the diode D6 being connected to the RemoteLED- pin, and the cathode of the diode D9 and the cathode of the diode D8 being connected, the diodes D6, D7, D8 and D9 being Schottky diodes;

[0013] The diodes D8 and D9 lead out a resistor R17 and a resistor R5, the resistor R5 being connected in parallel with a capacitor C24, the capacitor C24 being grounded, the two ends of the resistor R5 being connected to the 1 pin and the 2 pin of an opto-coupler U3, respectively, the 1 pin and the 2 pin being connected with a light-emitting diode, the 4 pin of the opto-coupler U3 being connected to VCC, the 3 pin of the opto-coupler U3 leading out a resistor R4, the resistor R4 leading out a resistor R16 and a resistor R10 in parallel, the resistor R10 being connected in parallel with a capacitor C22 and then grounded, the resistor R16 being connected with a capacitor C25, the capacitor C25 being connected with the resistor R10, and the capacitor C25 and the resistor R16 leading out an ALARM.

[0014] Preferably, the sound output circuit includes a rectifier bridge DB3, the rectifier bridge DB3 being connected with a ground wire, positive and negative poles of a 24V DC, and leading out a resistor R15;

[0015] The resistor R15 is connected with a triode Q7, the emitter and the base of the triode Q7 being connected to the two ends of the resistor R15, respectively, the collector of the triode Q7 being connected with the negative pole of a voltage stabilizing diode ZD2, the positive pole of the voltage stabilizing diode ZD2 being connected with the resistor R15, the voltage stabilizing diode ZD2 being connected in parallel with a resistor R6, one end of the resistor R6 leading out a resistor R8 and then being grounded, the other end of the resistor R6 being connected with a field effect transistor Q8, the gate of the field effect transistor Q8 being connected between the resistor R6 and the resistor R8, the source of the field effect transistor Q8 being connected with the resistor R6, the drain of the field effect transistor Q8 leading out a resistor R19, and the field effect transistor Q8 being connected in parallel with a resistor R18 and a resistor R20.

[0016] The electrolytic capacitor C12 is connected between the resistor R18 and the resistor R20, and the resistor R20 is connected with the resistor R22, and the electrolytic capacitor C13 and the capacitor C15 are connected in parallel with the resistor R22, and the capacitor C15 is connected with the resistor R24;

[0017] One end of the resistor R24 is connected with the TP6, and the other end of the resistor R24 is connected with the inductor L2, and the J3 terminal is connected in parallel with the inductor L2, and the J3 terminal is used for connecting two ends of the buzzer, and the inductor L2 is connected with the field effect tube Q10;

[0018] The capacitor C16, the capacitor C19 and the capacitor C21 are connected in sequence between the drain and the source of the field effect tube Q10, and the capacitor C20 is connected between the gate and the source of the field effect tube Q10, and the resistor R34 is connected in parallel with the capacitor C20, and the resistor R35 connected with the resistor R34 is connected with the port TP5 and the MUSIC pin of the MCU module.

[0019] Preferably, the sound base further comprises a power conversion circuit, and the MCU module and the opto-coupler switch circuit are connected with the power conversion circuit, and the power conversion circuit is used for converting voltage into 3.3V voltage for the MCU module and the opto-coupler switch circuit.

[0020] Preferably, the power conversion circuit comprises a power port TP1 and a power port TP2, and the variable resistor VR1 and the rectifier bridge DB1 are connected in parallel between the power port TP1 and the power port TP2, and one end of the rectifier bridge DB1 is connected with the ground.

[0021] The resistor R1 and the resistor R2 connected in parallel are connected with the other end of the rectifier bridge DB1, the base of the triode Q1 is connected with the resistor R1, the collector of the triode Q1 is connected with the resistor R2, the base of the triode Q2 is connected with the emitter of the triode Q1, the collector of the triode Q2 is connected with the resistor R2, and the emitter of the triode Q2 is connected with the power IC chip U1.

[0022] The input voltage VIN end of the power IC chip U1 is connected with the emitter of the triode Q2, the output voltage end of the power IC chip U1 is connected with VCC, and the capacitor C6 is connected with the output voltage end of the power IC chip U1 and the ground.

[0023] Preferably, the sound base further comprises a 24V power supply, and the power conversion circuit and the sound output circuit are connected with the 24V power supply, and the 24V power supply is used for supplying power for the sound base.

[0024] Preferably, the sound base further comprises a reset circuit, which is connected with the power conversion circuit and the MCU module, and is used for resetting the MCU module.

[0025] Preferably, the reset circuit comprises a resistor R13 connected with VCC and a resistor R14 connected with the MCU module, and a capacitor C8 is led between the resistor R13 and the resistor R14, and the capacitor C8 is connected with ground.

[0026] Preferably, the MCU module comprises 7 pins, wherein pin 1 is electrically connected with the resistor R14, pin 2 is ISP CLK, pin 3 is MUSIC, pin 4 is DATA I / O, pin 5 is ALARM, pin 6 is connected with ground, and pin 7 is connected with VCC.

[0027] In the second aspect, the application provides a fire alarm system, wherein the fire alarm system is provided with the sound base as described above.

[0028] The application has the following beneficial effects: when the detector alarms, the light coupling is triggered to open, and the I / O port of the ALARM outputs high level; after the MCU circuit detects the high level signal of the ALARM, the MCU sends out a PWM wave to control the sound output circuit to realize sound alarm; the sound output circuit receives the PWM wave sent out by the MCU, and the buzzer sends out sound.

[0029] Therefore, each detector can be directly connected to the sound base, the bus load is effectively reduced, the alarm sound can be triggered immediately when the detector detects fire, the timeliness of alarm is improved, the flexibility of the system is increased, and the cost is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will further describe the application with reference to the drawings and embodiments, and the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor:

[0031] Figure 1 is a circuit structure schematic diagram of the sound base of the embodiment of the application.

[0032] Figure 2 is a schematic diagram of the sound output circuit of the embodiment of the application.

[0033] Figure 3 is a schematic diagram of the bus power supply of the embodiment of the application.

[0034] Figure 4 is a schematic diagram of the light coupling switch circuit of the embodiment of the application.

[0035] Figure 5 is a schematic diagram of the MCU module of the embodiment of the present application.

[0036] Figure 6 is a schematic diagram of the reset circuit of the embodiment of the present application.

[0037] Figure 7 is a schematic diagram of the ISP encoding of the embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0039] The embodiment of the present application discloses an acoustic base and a fire alarm system.

[0040] Embodiment 1

[0041] An acoustic base comprises an acoustic output circuit 1, an opto-coupler switch circuit 2, an MCU module 3, a power conversion circuit 4, a reset circuit 5 and a 24V power supply 6; the opto-coupler switch circuit 2, the acoustic output circuit 1 and the reset circuit 5 are electrically connected with the MCU module 3; the power conversion circuit 4 is electrically connected with the reset circuit 5, the MCU module 3 and the opto-coupler switch circuit 2 respectively; the 24V power supply 6 is electrically connected with the power conversion circuit 4 and the acoustic output circuit 1 respectively.

[0042] The opto-coupler switch circuit 2 is electrically connected with a detector, used for detecting the alarm state of the detector and sending a signal to the MCU module 3 when detecting the alarm of the detector; the MCU module 3 is used for outputting a corresponding PWM wave to the acoustic output circuit 1 when receiving the signal; the acoustic output circuit 1 is used for outputting sound according to the PWM wave; the power conversion circuit 4 is used for converting voltage to 3.3V voltage for use of the MCU module 3 and the opto-coupler switch circuit 2; the reset circuit 5 is used for resetting the MCU module 3; and the 24V power supply 6 is used for powering the acoustic base.

[0043] The opto-coupler switch circuit 2 comprises a RemoteLED+ pin and a RemoteLED- pin, the RemoteLED+ pin and the RemoteLED- pin are used for connecting with the port of the detector, the RemoteLED+ pin leads out a capacitor C26, the RemoteLED- pin leads out a capacitor C27, and the capacitor C26 and the capacitor C27 are grounded;

[0044] The optical coupling switch circuit 2 further comprises diode D6, diode D7, diode D8 and diode D9, the positive pole of diode D6 and diode D7 is connected between capacitor C26 and capacitor C27, the negative pole of diode D7 and the positive pole of diode D8 are connected on the RemoteLED+ pin, the positive pole of diode D9 and the negative pole of diode D6 are connected on the RemoteLED- pin, the negative pole of diode D9 and the negative pole of diode D8 are connected, and diode D6, diode D7, diode D8 and diode D9 are all Schottky diodes.

[0045] The resistance R17 and the resistance R5 are led out between diode D8 and diode D9, the capacitor C24 is connected in parallel on the resistance R5, C24 is grounded, the two ends of the resistance R5 are respectively connected with the 1 pin and the 2 pin of the optical coupling U3, the light-emitting diode is connected between the 1 pin and the 2 pin, the 4 pin of the optical coupling U3 is connected with VCC, the resistance R4 is led out from the 3 pin of the optical coupling U3, the resistance R16 and the resistance R10 are led out from the resistance R4, the resistance R16 and the resistance R10 are connected in parallel, the capacitor C22 is connected in parallel on the resistance R10 and then grounded, the capacitor C25 is connected on the resistance R16, the capacitor C25 is connected with the resistance R10, and the ALARM is led out between the capacitor C25 and the resistance R16.

[0046] When the acoustic base works normally, the detector does not alarm, there is no voltage difference between the RemoteLED+ pin and the RemoteLED- pin, the optical coupling U3 is in the open state, and the ALARM is in the low level state. When the detector alarms, there is a voltage of about 3V between the two RemoteLED+ pin and RemoteLED- pin interfaces on the corresponding acoustic base, the voltage is divided by the Schottky diode and the resistance to reach the 1 pin and the 2 pin of the optical coupling U3, which triggers the conduction of the optical coupling, so that the ALARM realizes the high level output. When the MCU chip detects that the ALARM has a high level, and the threshold value of the high level needs to reach a certain limit, the MCU controls the MUSIC pin to output the PWM wave.

[0047] The MCU module 3 comprises 7 pins, wherein the pin 1 is electrically connected with the resistance R14, the pin 2 is ISP CLK, the pin 3 is MUSIC, the pin 4 is DATA I / O, the pin 5 is ALARM, the pin 6 is grounded, and the pin 7 is connected with VCC.

[0048] The acoustic output circuit 1 comprises the rectifier bridge DB3, the ground wire, the positive and negative poles of the 24V direct current are connected on the rectifier bridge DB3, and the resistance R15 is led out from the rectifier bridge DB3.

[0049] The resistance R15 is connected with the triode Q7, the emitter and the base of the triode Q7 are connected at two ends of the resistance R15 respectively, the collector of the triode Q7 is connected with the negative pole of the stabilizing diode ZD2, the positive pole of the stabilizing diode ZD2 is connected with the resistance R15, the resistance R6 is connected in parallel with the stabilizing diode ZD2, one end of the resistance R6 is connected with the resistance R8 and grounded, the other end of the resistance R6 is connected with the field effect tube Q8, the gate of the field effect tube Q8 is connected between the resistance R6 and the resistance R8, the source of the field effect tube Q8 is connected with the resistance R6, the drain of the field effect tube Q8 is connected with the resistance R19, the resistance R18 and the resistance R20 are connected in parallel with the field effect tube Q8.

[0050] The electrolytic capacitor C12 is connected between the resistance R18 and the resistance R20 and grounded, the resistance R20 is connected with the resistance R22, the electrolytic capacitor C13 and the capacitor C15 are connected in parallel with the resistance R22 and grounded, the capacitor C15 is connected with the resistance R24.

[0051] One end of the resistance R24 is connected with the TP6, the other end of the resistance R24 is connected with the inductor L2, the J3 terminal is connected in parallel with the inductor L2, the J3 terminal is used for connecting two ends of the buzzer, the inductor L2 is connected with the field effect tube Q10.

[0052] The capacitor C16, the capacitor C19 and the capacitor C21 are connected in sequence between the drain and the source of the field effect tube Q10 and grounded, the capacitor C20 is connected between the gate and the source of the field effect tube Q10, the resistance R34 is connected in parallel with the capacitor C20, the resistance R35 connected with the port TP5 is connected with the MUSIC pin of the MCU module 3.

[0053] The power supply of the sound output circuit 1 adopts the 24V power supply 6, and the rectifier bridge DB3 is used for rectifying, when the resistance R15 reaches the opening threshold of Q7, Q7 is turned on, the ZD2 stabilizing diode is used for preventing the sudden high voltage caused by the unstable 24V voltage from damaging the rear-end MOS, the MOS tube Q8 is used for opening and closing the charging channel of the electrolytic capacitors C12 and C13, when Q8 is turned on, the two electrolytic capacitors C12 and C13 will be charged, the J3 terminal is connected with two ends of the buzzer, the MUSIC pin of the MCU outputs the PWM wave, thereby controlling the opening and closing of Q10, so that the buzzer buzzes at the set frequency.

[0054] The power conversion circuit 4 includes the power port TP1 and the power port TP2, the variable resistance VR1 and the rectifier bridge DB1 are connected in parallel between the power port TP1 and the power port TP2, one end of the rectifier bridge DB1 is grounded.

[0055] The other end of the rectifier bridge DB1 leads the parallel resistance R1 and resistance R2, the resistance R1 and resistance R2 between the connection triode Q1, triode Q1's base with resistance R1 connection, collector and resistance R2 connection, the emitter on the base of triode Q2, triode Q2's collector and resistance R2, emitter has power IC chip U1.

[0056] The input voltage VIN end of power IC chip U1 is electrically connected with the emitter of triode Q2, the output voltage end is connected with VCC, and capacitor C6 is led out at the same time. The capacitor C6 is grounded and the power port TP3 is led out.

[0057] The power conversion circuit 4, the 24V power supply 6 is input from the power port, passes through the rectifier bridge DB1, and reaches the power IC chip U1 through the darlington tube. The power IC chip converts 8V voltage to 3.3V voltage for the reset circuit 5, MCU chip and optocoupler switch circuit 2.

[0058] The reset circuit 5 includes resistance R13 and resistance R14. The resistance R13 is connected with VCC, the resistance R14 is connected with MCU module 3, and the capacitor C8 is led out between the resistance R13 and the resistance R14. The capacitor C8 is grounded.

[0059] Each detector can be directly connected to the sound base, effectively reducing the bus load. The sound base not only realizes the existing base function, but also can immediately trigger the alarm sound when the detector detects fire, with fast response speed, accurate alarm position, and no influence on the working state of the terminal in the bus loop. It not only improves the timeliness of the alarm, but also increases the flexibility of the system, effectively reduces the cost and power consumption, and reduces the static power consumption of the 24V line to only 100 microamperes.

[0060] Embodiment 2

[0061] A fire alarm system includes any one of the sound base modules / structures or combinations of modules / structures mentioned in embodiment 1.

[0062] The implementation principle of the present application is that when the sound base receives the alarm signal sent by the detector, it will output the sound alarm function. The sound alarm circuit board is provided with a 24V power supply 6 input end, a power conversion circuit 4, an optocoupler switch circuit 2, an MCU circuit, a reset circuit 5 and a sound output circuit 1. The power conversion circuit 4 is used to connect the external 24V power supply 6, and convert 24V voltage to 3.3V for the needs of other circuits; the optocoupler switch circuit 2 will trigger the optocoupler to open when the detector alarms, and the ALARM I / O port outputs high level; the MCU circuit detects the high level signal of ALARM, and the MCU sends PWM wave to control the sound output circuit 1 to realize sound alarm; the reset circuit 5 is the reset of MCU. The sound output circuit 1 receives the PWM wave sent by MCU, and the buzzer emits sound.

[0063] It is to be understood that all such modifications and variations that can be made by those of ordinary skill in the art can be made in accordance with the above description and all such modifications and variations are considered to be within the scope of the application as defined by the following claims.

Claims

1. An acoustic mount, characterized by, The alarm device comprises a light coupling switch circuit, an MCU module and a sound output circuit; the light coupling switch circuit and the sound output circuit are electrically connected with the MCU module; The light coupling switch circuit is electrically connected with the detector, and is used for detecting the alarm state of the detector and sending a signal to the MCU module when detecting the alarm of the detector; The MCU module is used for outputting a corresponding PWM wave to the sound output circuit when receiving the signal; The sound output circuit is used for outputting sound according to the PWM wave.

2. An acoustic mount according to claim 1, wherein, The light coupling switch circuit comprises a RemoteLED+ pin and a RemoteLED- pin, the RemoteLED+ pin and the RemoteLED- pin are used for connecting with the port of the detector, the RemoteLED+ pin leads out a capacitor C26, the RemoteLED- pin leads out a capacitor C27, and the capacitor C26 and the capacitor C27 are grounded; The light coupling switch circuit further comprises a diode D6, a diode D7, a diode D8 and a diode D9, the positive poles of the diode D6 and the diode D7 are connected between the capacitor C26 and the capacitor C27, the negative pole of the diode D7 and the positive pole of the diode D8 are connected on the RemoteLED+ pin, the positive pole of the diode D9 and the negative pole of the diode D6 are connected on the RemoteLED- pin, the negative pole of the diode D9 and the negative pole of the diode D8 are connected, and the diode D6, the diode D7, the diode D8 and the diode D9 are all Schottky diodes; The resistor R17 and the resistor R5 are led out between the diode D8 and the diode D9, the capacitor C24 is connected in parallel on the resistor R5, the C24 is grounded, the 1 pin and the 2 pin of the light coupling U3 are respectively connected with the resistor R5, a light emitting diode is connected between the 1 pin and the 2 pin, the 4 pin of the light coupling U3 is connected with VCC, the resistor R4 is led out from the 3 pin of the light coupling U3, the resistor R16 and the resistor R10 are led out on the resistor R4, the resistor R16 and the resistor R10 are connected in parallel, the capacitor C22 is connected in parallel on the resistor R10, and then grounded, the capacitor C25 is connected on the resistor R16, the capacitor C25 is connected with the resistor R10, and the ALARM is led out between the capacitor C25 and the resistor R16.

3. An acoustic mount according to claim 1, wherein, The sound output circuit comprises a rectifier bridge DB3, the rectifier bridge DB3 is connected with a ground wire and 24V DC positive and negative poles, and the resistor R15 is led out from the rectifier bridge DB3; The resistance R15 is connected with a triode Q7, the emitter and the base of the triode Q7 are connected at both ends of the resistance R15 respectively, the collector of the triode Q7 is connected with the negative pole of a voltage stabilizing diode ZD2, the positive pole of the voltage stabilizing diode ZD2 is connected with the resistance R15, the voltage stabilizing diode ZD2 is connected with a resistance R6 in parallel, one end of the resistance R6 is connected with a resistance R8 and grounded, the other end of the resistance R6 is connected with a field effect transistor Q8, the gate of the field effect transistor Q8 is connected between the resistance R6 and the resistance R8, the source of the field effect transistor Q8 is connected with the resistance R6, the drain of the field effect transistor Q8 is connected with a resistance R19, the field effect transistor Q8 is connected with a resistance R18 and a resistance R20 in parallel; The resistance R18 and the resistance R20 are connected with an electrolytic capacitor C12 and grounded, the resistance R20 is connected with a resistance R22, the resistance R22 is connected with an electrolytic capacitor C13 and a capacitor C15 in parallel and grounded, the capacitor C15 is connected with a resistance R24; One end of the resistance R24 is connected with a TP6, the other end of the resistance R24 is connected with an inductor L2, the inductor L2 is connected with a J3 terminal in parallel, the J3 terminal is used for connecting both ends of a buzzer, the inductor L2 is connected with a field effect transistor Q10; The capacitor C16, the capacitor C19 and the capacitor C21 are connected in sequence between the drain and the source of the field effect transistor Q10 and grounded, the capacitor C20 is connected between the gate and the source of the field effect transistor Q10, the capacitor C20 is connected with a resistance R34 in parallel, the resistance R34 is connected with a resistance R35 and a port TP5 of the MCU module.

4. An acoustic mount according to claim 1, wherein, The sound base further comprises a power conversion circuit, the MCU module and the opto-coupler switching circuit are connected with the power conversion circuit, and the power conversion circuit is used for converting voltage into 3.3V voltage for the MCU module and the opto-coupler switching circuit.

5. An acoustic mount according to claim 4, wherein, The power conversion circuit comprises a power port TP1 and a power port TP2, the power port TP1 and the power port TP2 are connected with a variable resistor VR1 and a rectifier bridge DB1 in parallel, one end of the rectifier bridge DB1 is grounded; The other end of the rectifier bridge DB1 is connected with a resistance R1 and a resistance R2 in parallel, the resistance R1 and the resistance R2 are connected with a triode Q1, the base of the triode Q1 is connected with the resistance R1, the collector of the triode Q1 is connected with the resistance R2, and the emitter of the triode Q1 is connected with the base of a triode Q2, the collector of the triode Q2 is connected with the resistance R2, and the emitter of the triode Q2 is connected with a power IC chip U1; The input voltage VIN end of the power IC chip U1 is electrically connected with the emitter of the triode Q2, the output voltage end of the power IC chip U1 is connected with VCC, and a capacitor C6 is connected.

6. An acoustic mount according to claim 1, wherein, The sound base further comprises a 24V power supply, the power conversion circuit and the sound output circuit are electrically connected with the 24V power supply, and the 24V power supply is used for supplying power for the sound base.

7. An acoustic mount according to claim 4, wherein, The sound base further comprises a reset circuit connected with the power conversion circuit and the MCU module, and the reset circuit is used for resetting the MCU module.

8. An acoustic mount according to claim 7, wherein, The reset circuit comprises a resistor R13 connected with VCC and a resistor R14 connected with the MCU module, and a capacitor C8 is led out between the resistor R13 and the resistor R14 and connected with the ground.

9. An acoustic mount according to claim 8, wherein, The MCU module comprises seven pins, wherein pin 1 is electrically connected with the resistor R14, pin 2 is ISP CLK, pin 3 is MUSIC, pin 4 is DATA I / O, pin 5 is ALARM, pin 6 is connected with the ground, and pin 7 is connected with VCC.

10. A fire alarm system, characterized in that The fire alarm system is provided with the sound base as claimed in any one of claims 1-9.

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