CN217360911U

CN217360911U - Fire alarm device

Info

Publication number: CN217360911U
Application number: CN202221075378.4U
Authority: CN
Inventors: 代云志; 袁宏永
Original assignee: Hefei Kedalian Safety Technology Co ltd
Current assignee: Hefei Kedalian Safety Technology Co ltd
Priority date: 2022-05-06
Filing date: 2022-05-06
Publication date: 2022-09-02
Anticipated expiration: 2032-05-06

Abstract

The utility model discloses a fire alarm device, which comprises a master control MCU, a double light emitting circuit, a light signal receiving circuit, an alarm circuit, an infrared remote control circuit, a wireless communication circuit and a silencing circuit, wherein the double light emitting circuit, the light signal receiving circuit, the infrared remote control circuit of the alarm circuit, the wireless communication circuit and the silencing circuit are all connected with the master control MCU; the utility model has the advantages that: when the staff knows the fire alarm and gets rid of the hidden danger of the fire, the alarm is stopped in time, thereby preventing the alarm circuit from continuously giving an alarm and avoiding interfering with the lives of residents around the alarm point.

Description

Fire alarm device

Technical Field

The utility model relates to a fire detection technology field, more specifically relates to a fire alarm device.

Background

Early, timely and reliable fire alarm is an important means for reducing fire loss. However, in the interference environment such as dust and water mist, the stand-alone smoke detector widely used at present, such as a single light source photoelectric smoke detector (single light technology), an ion-type smoke detector, an electrochemical smoke detector, and an infrared beam smoke detector, has a prominent problem of high false alarm rate. To solve this problem, a method of increasing the threshold of the scattered light intensity is usually used to avoid false alarm caused by non-smoke aerosol, but at the same time, the sensitivity of the fire detector will be greatly reduced, which is not beneficial to early detection and alarm of fire.

In recent years, basic research on fire smoke finds a fact that dust particles are larger than smoke particles, the diameter of the dust particles is 1-100 micrometers, and the diameter of the smoke particles is 0.01-1 micrometer. The mainstream fire smoke detector mainly judges whether a fire disaster occurs or not through the shielding or scattering level of smoke on an emission light source, namely, the relation between the scattering characteristic of the light source and the smoke particle size is utilized to judge fire aerosol and non-fire aerosol particles. However, when the fire alarm is triggered, due to the fact that the installation position of the alarm is high or the alarm is mistakenly reported, even if workers arrive at the site and fire hazards are eliminated, the alarm is still continued, and life of residents around the alarm point is disturbed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a fire alarm device is provided.

The utility model discloses a following technical means realizes solving above-mentioned technical problem: the utility model provides a fire alarm device, includes master control MCU, two optical emission circuit, light signal receiving circuit, alarm circuit, infrared remote control circuit, wireless communication circuit and amortization circuit, two optical emission circuit, light signal receiving circuit, the infrared remote control circuit of alarm circuit, wireless communication circuit and amortization circuit all are connected with master control MCU.

The utility model discloses when the staff learns fire alarm and gets rid of conflagration hidden danger, send signal for master control MCU through infrared remote control circuit, through master control MCU control alarm circuit stop alarm or through the switch of pressing amortization circuit, make master control MCU control alarm circuit stop alarm to prevent that alarm circuit from lasting the warning, avoid disturbing resident's around the warning point life.

Further, the dual light emitting circuit comprises a first emitting circuit for emitting a high-frequency light signal and a second emitting circuit for emitting a low-frequency light signal, the first emitting circuit and the second emitting circuit have the same structure, the first emitting circuit comprises a resistor R27, a triode Q5, a resistor R33, a light emitting diode D5 and a capacitor C25, one end of the resistor R27 is connected with a third pin of the main control MCU, the other end of the resistor R27 is connected with a base of the triode Q5, a collector of the triode Q5 is connected with a cathode of the light emitting diode D5, an anode of the light emitting diode D5 and a positive electrode of the capacitor C25 are both connected with the power supply V _ BLUE, a negative electrode of the capacitor C25 is grounded, and an emitter of the triode Q5 is grounded through the resistor R33; the model of the master MCU is CS2110 GN. The dual-light emitting circuit is controlled by the main control MCU to alternately emit high-frequency light signals or low-frequency light signals.

Furthermore, the first transmitting circuit and the second transmitting circuit both correspond to a group of driving circuits, the two groups of driving circuits have the same structure, the driving circuit corresponding to the first transmitting circuit includes a resistor R20, a boost chip U5, a capacitor C8, an inductor L2, a diode D3, a resistor R15, a resistor R18, a capacitor C11 and a capacitor C12, one end of the resistor R20 and a fourth pin of the boost chip U5 are both connected to a first pin of the main control MCU, the other end of the resistor R20 and one end of the capacitor C8 are both grounded, the other end of the capacitor C8, a fourth pin of the boost chip U5 and one end of the inductor L2 are all connected to the power supply V _ BAT, the other end of the inductor L2, the anode of the diode D3 and the first pin of the boost chip U5 are connected to and led out of the power supply interface SW _ ue, the cathode of the diode D3, one end of the resistor R15, one end of the capacitor C11 and one end of the capacitor C12 are connected to the power supply interface V _ ue, the other end of the resistor R15, the third pin of the boost chip U5 and one end of the resistor R18 are connected, and the other end of the resistor R18, the other end of the capacitor C11 and the other end of the capacitor C12 are connected and grounded. The driving circuit mainly drives the first transmitting circuit and the second transmitting circuit to work.

Furthermore, the optical signal receiving circuit includes a receiving diode D8, the receiving diode D8 is disposed in the shielding case, an anode of the receiving diode D8 is connected to the twenty-fourth pin of the main control MCU, a cathode of the receiving diode D8 is connected to the twenty-third pin of the main control MCU, and the receiving diode D8 receives the optical signals transmitted by the first transmitting circuit and the second transmitting circuit. The optical signal receiving circuit receives optical signals transmitted by the first transmitting circuit or the second transmitting circuit, in the process, under the condition that the optical signals are interfered or not interfered by water mist, dust and the like, ADC signals detected by the main control MCU change, difference is carried out between the detected ADC signals and ADC signals initially set to obtain ADC increment, and subsequent signal judgment is carried out by the ADC increment.

Further, alarm circuit includes resistance R43, resistance R49, triode Q11, inductance L3 and alarm BZ1, alarm BZ1 is bee calling organ and/or alarm indicator, the one end of resistance R43 is connected with master control MCU's sixteenth pin, and the other end of resistance R43, the one end of resistance R49 and triode Q11's base are connected, and the other end of triode Q11's projecting pole and resistance R49 is connected and ground connection, and triode Q11's collecting electrode, inductance L3's one end and alarm BZ 1's one end are connected, and alarm BZ 1's the other end is connected with inductance L3's the other end. The alarm circuit mainly alarms when the main control MCU judges a fire signal through an algorithm, and the alarm mode is sound and/or an indicator lamp.

Furthermore, the silencing circuit comprises a capacitor C24, a resistor R42 and a switch BT1, wherein one end of the resistor R42 is connected with a twentieth pin of the main control MCU, the other end of the resistor R42 is respectively connected with one end of a capacitor C24 and one end of a switch BT1, and the other end of the capacitor C42 and the other end of the switch BT1 are connected and grounded. The silencing circuit is mainly used for stopping alarming by pressing a switch BT1 of the silencing circuit when a worker knows the alarming condition, so that the alarming circuit is prevented from continuously alarming.

Furthermore, the infrared remote control circuit comprises a resistor R45, a resistor R41, a resistor R50, a MOS transistor Q10, a MOS transistor Q12, a capacitor C21, an infrared receiving chip IR1, a capacitor C22, a resistor R39 and a resistor R44, wherein one end of the resistor R41 is connected with the source of the MOS transistor Q10, the gate of the MOS transistor Q10, the other end of the resistor R41 and the collector of the triode Q12 are connected, the drain of the MOS transistor Q10 and one end of the capacitor C21 are connected and connected with a power supply V _ IR _ RCV, the other end of the capacitor C21 is grounded, one end of the resistor R45 is connected with a twenty-ninth pin of the master control MCU, the other end of the resistor R45, one end of the resistor R50 and the base of the triode Q12, and the emitter of the triode Q12 and the other end of the resistor R50 are connected and grounded; the first pin of the infrared receiving chip IR1, one end of the capacitor C22 and one end of the resistor R39 are connected, the other end of the capacitor C22 is connected with the second pin of the infrared receiving chip IR1 and is grounded, the other end of the resistor R39 is connected with one end of the resistor R44 and is connected with the power supply V _ IR _ RCV, and the other end of the resistor R44 is connected with the third pin of the infrared receiving chip IR1 and is connected with the thirtieth pin of the main control MCU. The infrared remote control circuit is mainly used for enabling the main control MCU to receive signals in a remote control mode when a worker knows the alarm condition, so that the alarm circuit is controlled to stop alarming.

Furthermore, the wireless communication circuit comprises an NB-Iot communication unit, an Internet of things card, a power supply unit, a restarting unit and a waking unit, wherein the NB-Iot communication unit is connected with the main control MCU, the Internet of things card is connected with the NB-Iot communication unit, and the power supply unit, the restarting unit and the waking unit are respectively connected between the NB-Iot communication unit and the main control MCU. The wireless communication circuit is mainly convenient for sending out other information such as alarm signals and the like in a wireless communication mode.

Furthermore, the fire alarm device further comprises a Hall detection circuit and an LED state indicating circuit, wherein the output end of the Hall detection circuit is connected with a nineteenth pin of the master control MCU, the LED state indicating circuit comprises three groups of LED lamps respectively connected with a power supply V _ BAT, and the three groups of LED lamps are respectively connected with an eighth pin to a tenth pin of the master control MCU. The LED state indicating circuit is used for indicating the working state of the circuit, the indicating lamp is turned on when the circuit is powered on to indicate that the circuit works, and the indicating lamp is turned off when the circuit is powered off to indicate that the circuit stops working.

The utility model has the advantages that:

(1) the utility model discloses when the staff learns fire alarm and get rid of the conflagration hidden danger, send signal for main control MCU through infrared remote control circuit, through main control MCU control alarm circuit stop alarm or through the switch of pressing amortization circuit, make main control MCU control alarm circuit stop alarm to prevent that alarm circuit from lasting the warning, avoid disturbing resident's life around the warning point.

(2) The utility model discloses set up wireless communication circuit, be convenient for send away other information such as alarm signal through wireless communication's mode.

Drawings

Fig. 1 is a schematic block diagram of a fire alarm device according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a main control MCU in the fire alarm device disclosed in the embodiment of the present invention;

fig. 3 is a schematic diagram of a dual light emitting circuit in a fire alarm device according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a driving circuit in a fire alarm device according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an optical signal receiving circuit in a fire alarm device according to an embodiment of the present invention;

fig. 6 is a schematic diagram of an alarm circuit in a fire alarm device according to an embodiment of the present invention;

fig. 7 is a schematic diagram of an audio circuit in a fire alarm device according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a part of an infrared remote control circuit in a fire alarm device according to an embodiment of the present invention;

fig. 9 is another schematic diagram of a part of an infrared remote control circuit in a fire alarm device according to an embodiment of the present invention;

fig. 10 is a schematic diagram of an NB-Iot communication unit in a fire alarm device according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a signal transfer unit in a fire alarm device according to an embodiment of the present invention;

fig. 12 is a schematic diagram of an internet of things card in a fire alarm device disclosed in the embodiment of the present invention;

fig. 13 is a schematic diagram of a power supply unit in a fire alarm device according to an embodiment of the present invention;

fig. 14 is a schematic diagram of a hall detection circuit in a fire alarm device according to an embodiment of the present invention;

fig. 15 is a schematic diagram of an LED status indication circuit in a fire alarm device according to an embodiment of the present invention;

fig. 16 is a flowchart illustrating an anti-interference method of a fire alarm device according to an embodiment of the present invention;

fig. 17 is a time-varying curve of the stimulus response of blue light to the smoke, mist and dust of the particles to be tested.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, a fire alarm device includes a main control MCU1, a dual light emitting circuit 2 for emitting light signals of two different frequencies, i.e., a high frequency and a low frequency, a driving circuit 3, a light signal receiving circuit 4, an alarm circuit 5, a silencing circuit 6, an infrared remote control circuit 7, a wireless communication circuit 8, a hall detection circuit 9, and an LED status indication circuit 10, wherein the dual light emitting circuit 2, the driving circuit 3, the light signal receiving circuit 4, the alarm circuit 5, the silencing circuit 6, the infrared remote control circuit 7, the wireless communication circuit 8, the hall detection circuit 9, and the LED status indication circuit 10 are all connected to the main control MCU 1.

As shown in fig. 3, the dual light emitting circuit 2 includes a first emitting circuit for emitting a high frequency light signal and a second emitting circuit for emitting a low frequency light signal, the first emitting circuit and the second emitting circuit have the same structure, the first emitting circuit includes a resistor R27, a transistor Q5, a resistor R33, a light emitting diode D5 and a capacitor C25, one end of the resistor R27 is connected to the third pin of the main control MCU1, the other end of the resistor R27 is connected to the base of the transistor Q5, the collector of the transistor Q5 is connected to the cathode of the light emitting diode D5, the anode of the light emitting diode D5 and the anode of the capacitor C25 are both connected to the power source V _ BLUE, the cathode of the capacitor C25 is grounded, and the emitter of the transistor Q5 is grounded through the resistor R33; as shown in fig. 2, the master MCU1 has a model CS2110 GN. The dual light emitting circuit 2 is controlled by the main control MCU1 to alternately emit high-frequency light signals or low-frequency light signals. The utility model discloses in, the light signal of high frequency is the blue light, and the light signal of low frequency is the infrared light.

As shown in fig. 4, the first transmitting circuit and the second transmitting circuit both correspond to a set of driving circuits 3, the two sets of driving circuits 3 have the same structure, the driving circuit 3 corresponding to the first transmitting circuit includes a resistor R20, a boost chip U5, a capacitor C8, an inductor L2, a diode D3, a resistor R15, a resistor R18, a capacitor C11, and a capacitor C12, one end of the resistor R20 and a fourth pin of the boost chip U5 are connected to a first pin of the main control MCU1, the other end of the resistor R20 and one end of the capacitor C8 are grounded, the other end of the capacitor C8, a fourth pin of the boost chip U5 and one end of the inductor L2 are connected to the power supply V _ BAT, the other end of the inductor L5, the anode of the diode D3 and the first pin of the boost chip U5 are connected to and led out of the power supply interface SW _ b, the cathode of the diode D3, one end of the resistor R6342, one end of the capacitor C11 and one end of the capacitor C12 are connected to and led out of the power supply interface V _ b, the other end of the resistor R15, the third pin of the boost chip U5 and one end of the resistor R18 are connected, and the other end of the resistor R18, the other end of the capacitor C11 and the other end of the capacitor C12 are connected and grounded. The driving circuit 3 mainly drives the first transmitting circuit and the second transmitting circuit to operate.

As shown in fig. 5, the optical signal receiving circuit 4 includes a receiving diode D8, the receiving diode D8 is disposed in the shielding case, an anode of the receiving diode D8 is connected to the twenty-fourth pin of the main control MCU1, a cathode of the receiving diode D8 is connected to the twenty-third pin of the main control MCU1, and the receiving diode D8 receives optical signals transmitted by the first transmitting circuit and the second transmitting circuit. The optical signal receiving circuit 4 receives an optical signal transmitted by the first transmitting circuit or the second transmitting circuit, in the process, under the condition that the optical signal is interfered or not interfered by water mist, dust and the like, the ADC signal detected by the main control MCU1 changes, the difference is made between the detected ADC signal and the ADC signal initially set to obtain an ADC increment, and the subsequent signal is distinguished by the ADC increment.

As shown in fig. 6, the alarm circuit 5 includes a resistor R43, a resistor R49, a triode Q11, an inductor L3 and an alarm BZ1, the alarm BZ1 is a buzzer and/or an alarm indicator light, one end of the resistor R43 is connected to the sixteenth pin of the main control MCU1, the other end of the resistor R43, one end of the resistor R49 and the base of the triode Q11 are connected, the emitter of the triode Q11 and the other end of the resistor R49 are connected to ground, the collector of the triode Q11, one end of the inductor L3 and one end of the alarm BZ1 are connected, and the other end of the alarm BZ1 is connected to the other end of the inductor L3. The alarm circuit 5 mainly alarms when the main control MCU1 judges a fire signal through an algorithm, and the alarm mode is sound and/or an indicator lamp.

As shown in fig. 7, the fire alarm device further includes a silencing circuit 6, the silencing circuit 6 includes a capacitor C24, a resistor R42 and a switch BT1, one end of the resistor R42 is connected to the twentieth pin of the main control MCU1, the other end of the resistor R42 is connected to one end of a capacitor C24 and one end of a switch BT1, and the other end of the capacitor C42 and the other end of the switch BT1 are connected to ground. The silencing circuit 6 stops alarming by pressing the switch BT1 of the silencing circuit 6 when the staff knows the alarming condition, so as to prevent the alarming circuit 5 from continuously alarming.

As shown in fig. 8 and 9, the fire alarm device further includes an infrared remote control circuit 7, the infrared remote control circuit 7 includes a resistor R45, a resistor R41, a resistor R50, a MOS transistor Q10, a MOS transistor Q12, a capacitor C21, an infrared receiving chip IR1, a capacitor C22, a resistor R39, and a resistor R44, one end of the resistor R41 is connected to a source of the MOS transistor Q10, a gate of the MOS transistor Q10, the other end of the resistor R41, and a collector of a triode Q12, a drain of the MOS transistor Q10 and one end of the capacitor C21 are connected to and connected to a power supply V _ IR _ RCV, the other end of the capacitor C21 is grounded, one end of the resistor R45 is connected to a twenty-ninth pin of the main control MCU1, the other end of the resistor R45, one end of the resistor R50, and a base of a triode Q12, an emitter of the triode Q12 and the other end of the resistor R50 are connected to and grounded; the first pin of the infrared receiving chip IR1, one end of the capacitor C22 and one end of the resistor R39 are connected, the other end of the capacitor C22 is connected with the second pin of the infrared receiving chip IR1 and grounded, the other end of the resistor R39 is connected with one end of the resistor R44 and connected with the power supply V _ IR _ RCV, and the other end of the resistor R44 is connected with the third pin of the infrared receiving chip IR1 and connected with the thirtieth pin of the main control MCU 1. The infrared remote control circuit 7 mainly enables the main control MCU1 to receive signals in a remote control mode when a worker knows the alarm condition, so as to control the alarm circuit 5 to stop alarming.

The fire alarm device further comprises a wireless communication circuit 8, the wireless communication circuit 8 comprises an NB-Iot communication unit, a signal switching unit, an Internet of things card, a power supply unit, a restarting unit and a waking unit, the NB-Iot communication unit is connected with the main control MCU1 through the signal switching unit, the Internet of things card is connected with the NB-Iot communication unit, and the power supply unit, the restarting unit and the waking unit are respectively connected between the NB-Iot communication unit and the main control MCU 1. The wireless communication circuit 8 is mainly convenient for sending out other information such as alarm signals and the like in a wireless communication mode.

As shown in fig. 10, the NB-Iot communication unit includes a communication chip U3, a resistor R16, a capacitor C13, a capacitor C14, and an antenna coaxial connector J4, wherein one end of the resistor R16 and one end of the capacitor C13 are both connected to the thirty-fifth pin of the communication chip U3, the other end of the resistor R16, one end of the capacitor C14 and the first pin of the antenna coaxial connector J4 are connected to each other, the third pin, the second pin of the antenna coaxial connector J4, the other end of the capacitor C13 and the other end of the capacitor C14 are connected to ground, the seventeenth pin and the eighteenth pin of the communication chip U3 are connected to the signal forwarding unit, and the eleventh pin, the twelfth pin and the thirteenth pin of the communication chip U3 are connected to the internet of things.

As shown in fig. 11, the signal transfer unit includes a resistor R3, a resistor R4, a resistor R5, a MOS transistor Q1 and a diode D1, a source of the MOS transistor Q1 is connected to an eighteenth pin of the communication chip U3, one end of the resistor R3 and an anode of the diode D1 are connected to a seventeenth pin of the communication chip U3, one end of the resistor R4 is connected to a gate of the MOS transistor Q1, the other end of the resistor R3 and the other end of the resistor R4 are connected to a power supply VDD _ EXT, a drain of the MOS transistor Q1 is connected to one end of the resistor R5 and a thirty-first pin of the main control MCU1, and a cathode of the diode D1 is connected to a thirty-second pin of the main control MCU 1.

As shown in fig. 12, the internet of things card includes a SIM card connector J1, an electrostatic protector U2, capacitors C1 to C4, a resistor R1, a resistor R2, a resistor R6 and a resistor R7, the first to fourth pins and the eighth pin of the SIM card connector J1 are connected and grounded, the fifth pin of the SIM card connector J1, the fifth pin of the electrostatic protector U2, one end of the capacitor C1, one end of the resistor R1 and one end of the resistor R2 are connected and grounded to a power supply VSIM, the sixth pin of the SIM card connector J1, the first pin of the electrostatic protector U2, one end of the capacitor C2 and one end of the resistor R2 are connected, the seventh pin of the SIM card connector J2, the fourth pin of the electrostatic protector U2, one end of the capacitor C2 and one end of the resistor R2 are connected, the tenth pin of the SIM card connector J2, the third pin of the electrostatic protector U2, one end of the capacitor C2 and one end of the capacitor R2 are connected and the other end 2 is connected to the capacitor C2, the other end of the resistor R2 is connected with the twelfth pin of the communication chip U3, the other end of the resistor R6 is connected with the thirteenth pin of the communication chip U3, and the other end of the resistor R1 and the other end of the resistor R7 are connected with the eleventh pin of the communication chip U3.

As shown in fig. 13, the power unit, the restart unit and the wake-up unit have the same structure, the power unit includes a resistor R30, a resistor R35 and a transistor Q7, one end of the resistor R30 is connected to a thirteenth pin of the main control MCU1, the other end of the resistor R30, one end of the resistor R35 and a base of the transistor Q7 are connected, the other end of the resistor R35 and an emitter of the transistor Q7 are connected to ground, and a collector of the transistor Q7 is connected to a seventh pin of the communication chip U3.

As shown in fig. 14 and 15, the fire alarm device further includes a hall detection circuit 9 and an LED status indication circuit 10, an output end of the hall detection circuit 9 is connected to a nineteenth pin of the main control MCU1, the LED status indication circuit 10 includes three groups of LED lamps respectively connected to the power supply V _ BAT, and the three groups of LED lamps are respectively connected to eighth pin to tenth pin of the main control MCU 1. The LED status indicating circuit 10 is used to indicate the working status of the circuit, and when the circuit is powered on, the indicator light is on to indicate that the circuit is working, and when the circuit is powered off, the indicator light is off to indicate that the circuit stops working. The hall detection circuit 9 mainly performs hall detection to detect a line current.

As shown in fig. 16, the working process of the present invention is:

first, ADC increment DeltaV of high-frequency optical signal is calculated _{Height of} Exceeding a predetermined high frequency optical ADC increment threshold Δ V _{High threshold} Then, the rising rate S of the high-frequency optical signal ADC to the time is calculated, and if the rising rate S is smaller than the rate threshold S _Threshold(s) And then calculating the ADC increment delta V of the low-frequency optical signal _{Is low in} ADC delta threshold Δ V for optical signals above low frequency _{Low threshold} Then, the ADC increment ratio DeltaV of the ADC increment of the high-frequency optical signal and the ADC increment ratio DeltaV of the low-frequency optical signal are calculated _{Height of} /ΔV _{Is low with} When the ratio is greater than the ratio threshold P _Threshold(s) And then, triggering an alarm circuit 5 to give an alarm, judging the rest results to be interference signals or no response, and not triggering the alarm. In this embodiment, the high-frequency optical signal has a frequency of 652THz and emits blue light, Δ V _{High threshold} ＝40mV，S _Threshold(s) The rising rate S is a ratio of an ADC increment of the high-frequency optical signal to time, the ADC increment of the high-frequency optical signal is a difference between an ADC value detected by the main control MCU1 when the first transmitting circuit operates and an initial value set when the first transmitting circuit does not operate, and similarly, the ADC increment of the low-frequency optical signal is a difference between an ADC value detected by the main control MCU1 when the second transmitting circuit operates and an initial value set when the second transmitting circuit does not operate, the frequency of the low-frequency optical signal is 313THz, and the low-frequency optical signal emits red external light, Δ V _{Low threshold} ＝10mV，P _Threshold(s) ＝2.8。

As shown in fig. 17, the experimental result of the time-varying curve of the stimulus response of the blue light to the smoke, water mist and dust of the particles to be detected proves that the rising curvature of the water mist is fastest, and then the smoke and finally the dust are generated. Initial ADCV with baseline ADC ₀ Recording the maximum A of the time period when the ADC is subjected to the external stimulus and rises within 1sDCV _max Then the ADC rising slope S in the period is calculated as V _max -V ₀ . When S is greater than the threshold value S _Threshold(s) At 150, the system determines that there is an interfering signal/no response and does not trigger an alarm.

It should be noted that the present invention mainly protects the hardware circuit architecture, and the method of using the dual optical transmission circuit, the driving circuit and the optical signal receiving circuit to alarm the fire based on the ADC increment comparison for the main control MCU1 is only a specific embodiment of the present invention, and the built-in alarm method of the main control MCU1 is not the key point of the present invention, the method can adopt any existing technology, for example, in the prior art, the application number 201410748629.4, and the publication date of the method is that in the Chinese utility model patent application of 2015, 3, month and 4, an aerosol particle size sensing method based on dual-wavelength scattering signals, a main control MCU1 emits blue light or infrared light through a dual-light emitting circuit, and after receiving corresponding scattering signals reflected by the aerosol through blue light scattering power PBL and infrared light scattering power PIR, an optical signal receiving circuit calculates the ratio R of the blue light scattering power to the infrared light scattering power; determining the median diameter dmed according to the relation between the scattering power ratio R of blue light and infrared light and the median diameter dmed of the aerosol; and comparing the blue light scattered light power PBL and the infrared light scattered light power PIR with the set corresponding thresholds PBlth and PIRth, and sending out corresponding interference prompt signals or corresponding fire alarm signals.

Through the technical scheme, the utility model discloses when the staff learns fire alarm and gets rid of the conflagration hidden danger, send signal for master control MCU1 through infrared remote control circuit 7, through master control MCU1 control alarm circuit 5 stop to report to the police or through the switch of pressing amortization circuit 6, make master control MCU1 control alarm circuit stop to report to the police to prevent that alarm circuit 5 from continuously reporting to the police, avoid disturbing resident's around the warning point life.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The fire alarm device is characterized by comprising a master control MCU, a double light transmitting circuit, a light signal receiving circuit, an alarm circuit, an infrared remote control circuit, a wireless communication circuit and a silencing circuit, wherein the double light transmitting circuit, the light signal receiving circuit, the infrared remote control circuit of the alarm circuit, the wireless communication circuit and the silencing circuit are all connected with the master control MCU.

2. The fire alarm device according to claim 1, wherein the dual light emitting circuit comprises a first emitting circuit for emitting a high frequency light signal and a second emitting circuit for emitting a low frequency light signal, the first emitting circuit and the second emitting circuit have the same structure, the first emitting circuit comprises a resistor R27, a transistor Q5, a resistor R33, a light emitting diode D5 and a capacitor C25, one end of the resistor R27 is connected with a third pin of the main control MCU, the other end of the resistor R27 is connected with a base of a transistor Q5, a collector of the transistor Q5 is connected with a cathode of the light emitting diode D5, an anode of the light emitting diode D5 and a positive electrode of the capacitor C25 are both connected with a power supply V _ BLUE, a negative electrode of the capacitor C25 is grounded, and an emitter of the transistor Q5 is grounded through a resistor R33; the model of the master MCU is CS2110 GN.

3. The fire alarm device of claim 2, wherein the first and second transmitting circuits each correspond to a set of driving circuits, the two sets of driving circuits have the same structure, the driving circuit corresponding to the first transmitting circuit includes a resistor R20, a boost chip U5, a capacitor C8, an inductor L2, a diode D3, a resistor R15, a resistor R18, a capacitor C11, and a capacitor C12, one end of the resistor R20 and a fourth pin of the boost chip U5 are connected to the first pin of the main control MCU, the other end of the resistor R20 and one end of the capacitor C8 are grounded, the other end of the capacitor C8, a fourth pin of the boost chip U5, and one end of the inductor L2 are connected to the power source V _ BAT, the other end of the inductor L2, the anode of the diode D3, and the first pin of the boost chip U5 are connected to the power source interface SW _ b, the cathode of the diode D3, and one end of the resistor R15, and the first pin of the boost chip U5 are connected to the power source interface SW _ b, One end of the capacitor C11 and one end of the capacitor C12 are connected and led out of the power interface V _ BLUE, the other end of the resistor R15 is connected with the third pin of the boost chip U5 and one end of the resistor R18, and the other end of the resistor R18, the other end of the capacitor C11 and the other end of the capacitor C12 are connected and grounded.

4. The fire alarm device according to claim 2, wherein the optical signal receiving circuit comprises a receiving diode D8, the receiving diode D8 is arranged in the shielding case, the anode of the receiving diode D8 is connected with the twenty-fourth pin of the master control MCU, the cathode of the receiving diode D8 is connected with the twenty-third pin of the master control MCU, and the receiving diode D8 receives the optical signals transmitted by the first transmitting circuit and the second transmitting circuit.

5. The fire alarm device according to claim 1, wherein the alarm circuit comprises a resistor R43, a resistor R49, a triode Q11, an inductor L3 and an alarm BZ1, the alarm BZ1 is a buzzer and/or an alarm indicator light, one end of the resistor R43 is connected with a sixteenth pin of the main control MCU, the other end of the resistor R43, one end of the resistor R49 and a base of the triode Q11 are connected, an emitter of the triode Q11 and the other end of the resistor R49 are connected and grounded, a collector of the triode Q11, one end of the inductor L3 and one end of the alarm BZ1 are connected, and the other end of the alarm BZ1 is connected with the other end of the inductor L3.

6. The fire alarm device of claim 1, wherein the silencing circuit comprises a capacitor C24, a resistor R42 and a switch BT1, one end of the resistor R42 is connected to the twentieth pin of the main control MCU, the other end of the resistor R42 is connected to one end of a capacitor C24 and one end of a switch BT1, and the other end of the capacitor C42 and the other end of the switch BT1 are connected to ground.

7. The fire alarm device according to claim 6, wherein the infrared remote control circuit comprises a resistor R45, a resistor R41, a resistor R50, a MOS transistor Q10, a MOS transistor Q12, a capacitor C21, an infrared receiving chip IR1, a capacitor C22, a resistor R39 and a resistor R44, one end of the resistor R41 is connected with a source of the MOS transistor Q10, a gate of the MOS transistor Q10, the other end of the resistor R41 and a collector of a triode Q12 are connected, a drain of the MOS transistor Q10 and one end of a capacitor C21 are connected and connected with a power supply V _ IR _ RCV, the other end of the capacitor C21 is grounded, one end of the resistor R45 is connected with a twenty-ninth pin of the MCU, the other end of the resistor R45, one end of the resistor R50 and a base of a triode Q12, an emitter of the triode Q12 and the other end of the resistor R50 are connected and grounded; the first pin of the infrared receiving chip IR1, one end of the capacitor C22 and one end of the resistor R39 are connected, the other end of the capacitor C22 is connected with the second pin of the infrared receiving chip IR1 and is grounded, the other end of the resistor R39 is connected with one end of the resistor R44 and is connected with the power supply V _ IR _ RCV, and the other end of the resistor R44 is connected with the third pin of the infrared receiving chip IR1 and is connected with the thirtieth pin of the main control MCU.

8. The fire alarm device according to claim 1, wherein the wireless communication circuit comprises an NB-Iot communication unit, an IOT card, a power supply unit, a restart unit and a wake-up unit, the NB-Iot communication unit is connected with the main control MCU, the IOT card is connected with the NB-Iot communication unit, and the power supply unit, the restart unit and the wake-up unit are respectively connected between the NB-Iot communication unit and the main control MCU.

9. The fire alarm device according to claim 1, further comprising a hall detection circuit, wherein an output terminal of the hall detection circuit is connected with a nineteenth pin of the main control MCU.

10. The fire alarm device according to claim 1, further comprising an LED status indication circuit, wherein the LED status indication circuit comprises three groups of LED lamps respectively connected with a power supply V _ BAT, and the three groups of LED lamps are respectively connected with eighth pins to tenth pins of the main control MCU.