CN221281592U - Intelligent building smoke alarm system - Google Patents
Intelligent building smoke alarm system Download PDFInfo
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- CN221281592U CN221281592U CN202323304592.XU CN202323304592U CN221281592U CN 221281592 U CN221281592 U CN 221281592U CN 202323304592 U CN202323304592 U CN 202323304592U CN 221281592 U CN221281592 U CN 221281592U
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- 239000000779 smoke Substances 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 41
- 238000004891 communication Methods 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 37
- 239000003381 stabilizer Substances 0.000 claims description 13
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 18
- 230000003287 optical effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Abstract
The utility model relates to the technical field of smoke alarm and provides an intelligent building smoke alarm system which comprises a fire detection circuit, a main control unit and a communication unit, wherein the fire detection circuit is connected with the main control unit, the main control unit is in communication connection with a monitoring terminal by means of the communication unit, the fire detection circuit comprises a resistor R4, a thermistor RT, a triode Q1 and a fire sensor P1, a first end of the thermistor RT is connected with a 12V power supply, a second end of the thermistor RT is connected with a base electrode of the triode Q1, a first end of the resistor R4 is connected with a 12V power supply, a second end of the resistor R4 is connected with an emitter electrode of the triode Q1, a collector electrode of the triode Q1 is connected with a first power supply end of the fire sensor P1, a second output end of the fire sensor P1 is grounded, and an output end of the fire sensor P1 is connected with a first input end of the main control unit. Through the technical scheme, the problem of low detection precision of the smoke alarm system in the related technology is solved.
Description
Technical Field
The utility model relates to the technical field of smoke alarm, in particular to an intelligent building smoke alarm system.
Background
Fire hazard is the most common one in endangering human life and property disasters, people in the society today live and work in modern high-rise buildings, and once the fire hazard occurs in the large-scale buildings, huge losses are caused to the life and property of people, so that a smoke alarm system with perfect functions is extremely important for forecasting fire conditions in real time, preventing the fire conditions from happening, and guaranteeing the safety of the lives and property of people. The traditional smoke alarm system has high power consumption and is influenced by environmental factors, so that the existing building smoke alarm system has the defects of low detection precision and insensitive fire detection when detecting fire.
Disclosure of utility model
The utility model provides an intelligent building smoke alarm system, which solves the problem of low detection precision of the smoke alarm system in the related technology.
The technical scheme of the utility model is as follows:
The intelligent building smoke alarm system comprises a fire detection circuit, a main control unit and a communication unit, wherein the fire detection circuit is connected with the main control unit, the main control unit is in communication connection with a monitoring terminal by means of the communication unit, the fire detection circuit comprises a resistor R4, a thermistor RT, a triode Q1 and a fire sensor P1,
The first end of thermistor RT connects 12V power, thermistor RT's second end is connected triode Q1's base, 12V power is connected to resistor R4's first end, resistor R4's second end is connected triode Q1's projecting pole, triode Q1's collecting electrode is connected fire sensor P1's first power supply end, fire sensor P1's second output ground connection, fire sensor P1's output is connected master control unit's first input.
Further, the fire detection circuit of the present utility model further includes a resistor R3, a resistor R1, a resistor R2, and a voltage stabilizer D1, where a first end of the resistor R3 is connected to a 12V power supply, a second end of the resistor R3 is connected to a first end of the thermistor RT, a second end of the resistor R3 is connected to a first end of the resistor R4, a second end of the resistor R3 is connected to a first end of the resistor R2 through the resistor R1, a second end of the resistor R2 is grounded, a first end of the resistor R2 is connected to a control end of the voltage stabilizer D1, a cathode of the voltage stabilizer D2 is connected to a second end of the resistor R3, and an anode of the voltage stabilizer D2 is grounded.
Further, the fire detection circuit of the present utility model further includes a triode Q2, a resistor R5, a resistor R8, a resistor R10, an operational amplifier U3, and a resistor R7, where the second power supply end of the fire sensor P1 is connected to the collector of the triode Q2, the emitter of the triode Q2 is grounded through the resistor R5, the emitter of the triode Q2 is connected to the inverting input end of the operational amplifier U3 through the resistor R8, the inverting input end of the operational amplifier U3 is grounded through the resistor R10, the non-inverting input end of the operational amplifier U3 is connected to a signal generator, and the output end of the operational amplifier U3 is connected to the base of the triode Q2 through the resistor R7.
Further, the fire detection circuit of the present utility model further includes a capacitor C1, wherein a first end of the capacitor C1 is connected to the first end of the resistor R4, and a second end of the capacitor C1 is connected to the collector of the triode Q2.
Further, the utility model also comprises a signal conditioning circuit, wherein the signal conditioning circuit comprises a capacitor C2, an operational amplifier U1, a resistor R12, a resistor R13, an operational amplifier U2 and a resistor R14, a first end of the capacitor C2 is connected with an output end of the fire sensor P1, a second end of the capacitor C2 is connected with a non-inverting input end of the operational amplifier U1, an output end of the operational amplifier U1 is connected with an inverting input end of the operational amplifier U1, an output end of the operational amplifier U1 is connected with a non-inverting input end of the operational amplifier U2 through the resistor R12, an inverting input end of the operational amplifier U2 is grounded through the resistor R13, an output end of the operational amplifier U2 is connected with an inverting input end of the operational amplifier U2 through the resistor R14, and an output end of the operational amplifier U2 is connected with a first input end of the main control unit.
Further, the utility model also comprises a band-pass filter circuit, wherein the band-pass filter circuit comprises a resistor R15, a resistor R16, a capacitor C4, a capacitor C5, an operational amplifier U4 and a resistor R17, a first end of the resistor R15 is connected with an output end of the operational amplifier U2, a second end of the resistor R15 is grounded through the resistor R16, a second end of the resistor R15 is connected with an inverting input end of the operational amplifier U4 through the capacitor C5, a non-inverting input end of the operational amplifier U4 is grounded, an output end of the operational amplifier U4 is connected with a second end of the resistor R15 through the capacitor C4, an output end of the operational amplifier U4 is connected with an inverting input end of the operational amplifier U4 through the resistor R17, and an output end of the operational amplifier U4 is connected with a first input end of the main control unit.
Further, the utility model also comprises an alarm circuit, wherein the alarm circuit comprises an optical coupler U5, a resistor R21, a resistor R20, a switching tube Q7, a resistor R19 and an alarm B1, a first input end of the optical coupler U5 is connected with a first output end of the main control unit, a second input end of the optical coupler U5 is grounded, a first output end of the optical coupler U5 is connected with a 12V power supply through the resistor R21, a second output end of the optical coupler U5 is connected with a control end of the switching tube Q7 through the resistor R20, a first end of the switching tube Q7 is connected with a first end of the alarm B1, a second end of the alarm B1 is connected with a 12V power supply, and a second end of the switching tube Q7 is grounded through the resistor R19.
The working principle and the beneficial effects of the utility model are as follows:
In the utility model, the fire detection circuit is used for detecting whether fire occurs in a building, when the fire occurs in the building, the fire detection circuit is used for converting fire signals into electric signals and sending the electric signals to the main control unit, and meanwhile, the main control unit sends the fire signals to the monitoring terminal through the communication unit to inform corresponding personnel to take emergency measures in time.
The working principle of the fire detection circuit is as follows: the fire sensor P1 is configured to detect an infrared signal generated by flame combustion when a fire occurs in a building, convert the detected infrared signal with a specific frequency into an electrical signal, and send the electrical signal to the main control unit, and then the main control unit determines whether the fire occurs in the building according to the received electrical signal. However, the infrared detector is affected by the temperature of the working environment, so that the working current of the fire sensor P1 is unstable, the fire detection precision is poor, and the detection result is unreliable.
The fire sensor P1 of the present utility model has a negative temperature coefficient, and when the operating temperature increases, the current flowing through the fire sensor P1 decreases, and in the present utility model, the thermistor RT is used to detect the operating temperature of the fire sensor P1, and the thermistor RT has a positive temperature coefficient. When the operating temperature of the fire sensor P1 increases, the operating current of the fire sensor P1 decreases, the resistance of the thermistor RT increases, the base current of the transistor Q1 decreases, and the collector current of the transistor Q1 increases, so that the current flowing through the transistor Q1 increases; when the operating temperature of the fire sensor P1 decreases, the operating current of the fire sensor P1 increases, and the resistance of the thermistor RT decreases, so that the base current of the transistor Q1 increases, and thus the current flowing through the transistor Q1 decreases. Therefore, the utility model can automatically compensate the working current of the fire sensor P1 according to the working environment of the fire sensor P1, thereby improving the stability of the fire sensor P1 during working, further improving the accuracy of fire detection of a building and improving the reliability of circuit operation.
Drawings
The utility model will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a circuit diagram of a fire detection circuit according to the present utility model;
FIG. 2 is a circuit diagram of a signal conditioning circuit according to the present utility model;
FIG. 3 is a circuit diagram of a band pass filter circuit of the present utility model;
Fig. 4 is a circuit diagram of the alarm circuit in the present utility model.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, this embodiment provides an intelligent building smoke alarm system, including fire detection circuit, main control unit and communication unit, fire detection circuit connects main control unit, main control unit is with the help of communication unit and monitor terminal communication connection, fire detection circuit includes resistance R4, thermistor RT, triode Q1 and fire sensor P1, 12V power is connected to thermistor RT's first end, thermistor RT's second end is connected triode Q1's base, 12V power is connected to resistance R4's first end, triode Q1's projecting pole is connected to resistance R4's second end, fire sensor P1's first power supply end is connected to triode Q1's collecting electrode, fire sensor P1's second output ground connection, fire sensor P1's output is connected main control unit's first input.
In this embodiment, the fire detection circuit is used for detecting whether the building has a fire disaster, and when the building has a fire disaster, the fire detection circuit is used for converting the fire disaster signal into an electric signal and sending the electric signal to the main control unit, and simultaneously, the main control unit sends the fire disaster signal to the monitoring terminal through the communication unit to inform corresponding personnel to take emergency measures in time.
Specifically, the operating principle of the fire detection circuit is as follows: in this embodiment, an infrared detector is used as the fire sensor P1, when a fire signal occurs in a building, in addition to a smoke signal, an infrared signal with a certain frequency is generated by flame combustion, and the fire sensor P1 is used to detect an infrared signal generated by flame combustion when a fire occurs in the building, convert the detected infrared signal with a specific frequency into an electrical signal, send the electrical signal to the main control unit, and then the main control unit determines whether the fire occurs in the building according to the received electrical signal. However, the infrared detector is affected by the temperature of the working environment, so that the working current of the fire sensor P1 is unstable, the fire detection precision is poor, and the detection result is unreliable.
Specifically, the fire sensor P1 in this embodiment has a negative temperature coefficient, and when the operating temperature increases, the current flowing through the fire sensor P1 decreases, and in this embodiment, the thermistor RT is used to detect the operating temperature of the fire sensor P1, and the thermistor RT has a positive temperature coefficient. When the operating temperature of the fire sensor P1 increases, the operating current of the fire sensor P1 decreases, the resistance of the thermistor RT increases, the base current of the transistor Q1 decreases, and the collector current of the transistor Q1 increases, so that the current flowing through the transistor Q1 increases; when the operating temperature of the fire sensor P1 decreases, the operating current of the fire sensor P1 increases, and the resistance of the thermistor RT decreases, so that the base current of the transistor Q1 increases, and thus the current flowing through the transistor Q1 decreases. Therefore, the working current of the fire sensor P1 can be automatically compensated according to the working environment of the fire sensor P1, so that the stability of the fire sensor P1 during working is improved, the fire detection precision of a building is further improved, and the reliability of circuit working is improved.
As shown in fig. 1, in this embodiment, the fire detection circuit further includes a resistor R3, a resistor R1, a resistor R2, and a voltage stabilizer D1, where a first end of the resistor R3 is connected to a 12V power supply, a second end of the resistor R3 is connected to a first end of the thermistor RT, a second end of the resistor R3 is connected to a first end of the resistor R4, a second end of the resistor R3 is connected to a first end of the resistor R2 through the resistor R1, a second end of the resistor R2 is grounded, a first end of the resistor R2 is connected to a control end of the voltage stabilizer D1, a cathode of the voltage stabilizer D2 is connected to a second end of the resistor R3, and an anode of the voltage stabilizer D2 is grounded.
In this embodiment, the resistor R1, the resistor R2 and the voltage stabilizer D1 form a voltage stabilizing circuit, which provides reliable working voltages for the thermistor RT and the fire sensor P1, and improves the reliability of temperature compensation. Resistor R3 acts as a current limiter.
As shown in fig. 1, in this embodiment, the fire detection circuit further includes a triode Q2, a resistor R5, a resistor R8, a resistor R10, an operational amplifier U3 and a resistor R7, the second power supply end of the fire sensor P1 is connected to the collector of the triode Q2, the emitter of the triode Q2 is grounded through the resistor R5, the emitter of the triode Q2 is connected to the inverting input end of the operational amplifier U3 through the resistor R8, the inverting input end of the operational amplifier U3 is grounded through the resistor R10, the non-inverting input end of the operational amplifier U3 is connected to a signal generator, and the output end of the operational amplifier U3 is connected to the base of the triode Q2 through the resistor R7.
In this embodiment, the fire sensor P1 is in a continuous power supply state during the working process, so that the overall power consumption of the fire sensor P1 is high, and the aging of the circuit is accelerated to affect the service life of the fire sensor P1. If the circuit ages or is affected by uncontrollable factors, the operating voltage across the fire sensor P1 will change, again causing the accuracy of fire detection to deteriorate. Therefore, the present embodiment also adds a constant voltage operation circuit.
The constant voltage working circuit comprises a triode Q2, a resistor R5, a resistor R8, a resistor R10, an operational amplifier U3 and a resistor R7, when the constant voltage working circuit works, a signal generator is used for outputting triangular wave or sawtooth wave signals to the in-phase input end of the operational amplifier U3, the operational amplifier U3 forms a comparison amplifier, pulse signals are output after the comparison of the operational amplifier U3, when the pulse signals output by the operational amplifier U3 are at a high level, the triode Q2 is conducted, a fire sensor P1 works, an induced voltage is generated on the resistor R5, when the pulse signals output by the operational amplifier U3 are at a low level, the triode Q2 is cut off, and the fire sensor P1 stops working, so that a cycle is formed.
When the operating voltage of the fire sensor P1 increases, the voltage on the resistor R5 increases, so that the voltage at the inverting input terminal of the op-amp U3 increases, and the high level time of the pulse signal output by the op-amp U3 in one period decreases, so that the on time of the transistor Q2 decreases, and the average operating voltage of the fire sensor P1 decreases. When the operating voltage of the fire sensor P1 decreases, the voltage on the resistor R5 decreases, so that the voltage at the inverting input terminal of the op-amp U3 decreases, and the high level time of the pulse signal output by the op-amp U3 in one period increases, so that the on time of the triode Q2 increases, and the average operating voltage of the fire sensor P1 increases.
In this embodiment, the fire sensor P1 works in a pulse manner, which reduces the average power consumption of the fire sensor P1 during operation, improves the service life of the fire sensor P1, and ensures that the operating voltage of the fire sensor P1 is stable and unchanged, thereby further improving the accuracy of building fire detection.
As shown in fig. 1, the fire detection circuit in this embodiment further includes a capacitor C1, a first end of the capacitor C1 is connected to the first end of the resistor R4, and a second end of the capacitor C1 is connected to the collector of the triode Q2.
In this embodiment, when power is just applied, an instantaneous surge voltage is generated, and the amplitude of the surge voltage is very high, which may cause that the fire sensor P1 cannot work normally, so the capacitor C1 is added in this embodiment, the capacitor C1 plays a role in buffering, when power is just applied, the voltage at two ends of the capacitor C1 cannot be suddenly changed, the voltage of the emitter of the triode Q1 is 0, the capacitor C1 starts to charge, and as the capacitor C1 charges, the voltage on the emitter of the triode Q1 slowly rises, and the working voltage of the fire sensor P1 also slowly rises, so that the fire sensor P1 is prevented from being impacted by high voltage.
As shown in fig. 2, the signal conditioning circuit further includes a capacitor C2, an operational amplifier U1, a resistor R12, a resistor R13, an operational amplifier U2 and a resistor R14, where a first end of the capacitor C2 is connected to an output end of the fire sensor P1, a second end of the capacitor C2 is connected to an in-phase input end of the operational amplifier U1, an output end of the operational amplifier U1 is connected to an inverting input end of the operational amplifier U1, an output end of the operational amplifier U1 is connected to an in-phase input end of the operational amplifier U2 through the resistor R12, an inverting input end of the operational amplifier U2 is grounded through the resistor R13, an output end of the operational amplifier U2 is connected to an inverting input end of the operational amplifier U2 through the resistor R14, and an output end of the operational amplifier U2 is connected to a first input end of the main control unit.
In this embodiment, the electrical signal output by the fire sensor P1 is weak, and the main control unit cannot effectively identify the electrical signal, so that the main control unit needs to amplify the electrical signal, where the op amp U2 forms an amplifying circuit for amplifying the electrical signal output by the fire sensor P1, and finally sending the amplified electrical signal to the first input end of the main control unit. The electric signal output by the fire sensor P1 before amplification passes through the operational amplifier U1, the operational amplifier U1 forms a follower, and because the electric signal output by the fire sensor P1 is weak, certain loss can be generated in the transmission process of the signal, the electric signal added at the input end of the operational amplifier U2 is weaker, and the follower utilizes the characteristics of high input impedance and low output impedance of the follower, so that the effectiveness of signal transmission can be improved, and the loss of the signal on a line can be reduced.
As shown in fig. 3, the embodiment further includes a band-pass filter circuit, where the band-pass filter circuit includes a resistor R15, a resistor R16, a capacitor C4, a capacitor C5, an operational amplifier U4 and a resistor R17, a first end of the resistor R15 is connected to an output end of the operational amplifier U2, a second end of the resistor R15 is grounded through the resistor R16, a second end of the resistor R15 is connected to an inverting input end of the operational amplifier U4 through the capacitor C5, an non-inverting input end of the operational amplifier U4 is grounded, an output end of the operational amplifier U4 is connected to a second end of the resistor R15 through the capacitor C4, an output end of the operational amplifier U4 is connected to an inverting input end of the operational amplifier U4 through the resistor R17, and an output end of the operational amplifier U4 is connected to a first input end of the main control unit.
In this embodiment, the fire sensor P1 detects not only the specific infrared signal generated when a fire occurs in a building, but also the infrared signal in natural light, and the electric signal output by the fire sensor P1 is easily interfered by noise, and if amplified by the op amp U2, the interference signals may directly cover the useful electric signal, so that the accuracy of fire detection may be seriously affected, and therefore, the bandpass filter circuit is added in this embodiment.
The band-pass filter circuit is composed of a resistor R15, a resistor R16, a capacitor C4, a capacitor C5, an operational amplifier U4 and a resistor R17 and is used for filtering high-frequency clutter signals and noise signals in signals and finally sending the filtered electric signals to a first input end of the main control unit.
As shown in fig. 4, the embodiment further includes an alarm circuit, where the alarm circuit includes an optocoupler U5, a resistor R21, a resistor R20, a switching tube Q7, a resistor R19, and an alarm B1, where a first input end of the optocoupler U5 is connected to a first output end of the main control unit, a second input end of the optocoupler U5 is grounded, a first output end of the optocoupler U5 is connected to a 12V power supply through the resistor R21, a second output end of the optocoupler U5 is connected to a control end of the switching tube Q7 through the resistor R20, a first end of the switching tube Q7 is connected to a first end of the alarm B1, a second end of the alarm B1 is connected to a 12V power supply, and a second end of the switching tube Q7 is grounded through the resistor R19.
In this embodiment, if a fire disaster occurs in a building, the corresponding personnel needs to be informed to take emergency measures in time, and meanwhile, the people in the building should be informed to evacuate in time so as to avoid casualties. Therefore, in this embodiment, an alarm circuit is added, when a fire disaster occurs in a building, the first output end of the main control unit outputs a high-level signal, the optical coupler U5 is turned on, the optical coupler U5 outputs a high-level signal, the switching tube Q7 is turned on, the alarm B1 is powered on and sends an alarm signal, and the alarm signal is used for reminding people in the building to evacuate in time. When fire disaster does not occur in the building, the first output end of the main control unit outputs a low level, the optocoupler U5 is cut off, the switching tube Q7 is cut off, and the alarm B1 does not alarm.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (7)
1. The intelligent building smoke alarm system is characterized by comprising a fire detection circuit, a main control unit and a communication unit, wherein the fire detection circuit is connected with the main control unit, the main control unit is in communication connection with a monitoring terminal by means of the communication unit, the fire detection circuit comprises a resistor R4, a thermistor RT, a triode Q1 and a fire sensor P1,
The first end of thermistor RT connects 12V power, thermistor RT's second end is connected triode Q1's base, 12V power is connected to resistor R4's first end, resistor R4's second end is connected triode Q1's projecting pole, triode Q1's collecting electrode is connected fire sensor P1's first power supply end, fire sensor P1's second output ground connection, fire sensor P1's output is connected master control unit's first input.
2. The intelligent building smoke alarm system according to claim 1, wherein the fire detection circuit further comprises a resistor R3, a resistor R1, a resistor R2 and a voltage stabilizer D1, wherein a first end of the resistor R3 is connected to a 12V power supply, a second end of the resistor R3 is connected to a first end of the thermistor RT, a second end of the resistor R3 is connected to a first end of the resistor R4, a second end of the resistor R3 is connected to a first end of the resistor R2 through the resistor R1, a second end of the resistor R2 is grounded, a first end of the resistor R2 is connected to a control end of the voltage stabilizer D1, a cathode of the voltage stabilizer D2 is connected to a second end of the resistor R3, and an anode of the voltage stabilizer D2 is grounded.
3. The intelligent building smoke alarm system according to claim 1, wherein the fire detection circuit further comprises a triode Q2, a resistor R5, a resistor R8, a resistor R10, an operational amplifier U3 and a resistor R7, wherein the second power supply end of the fire sensor P1 is connected with the collector of the triode Q2, the emitter of the triode Q2 is grounded through the resistor R5, the emitter of the triode Q2 is connected with the inverting input end of the operational amplifier U3 through the resistor R8, the inverting input end of the operational amplifier U3 is grounded through the resistor R10, the non-inverting input end of the operational amplifier U3 is connected with a signal generator, and the output end of the operational amplifier U3 is connected with the base of the triode Q2 through the resistor R7.
4. The intelligent building smoke alarm system according to claim 1, wherein the fire detection circuit further comprises a capacitor C1, a first terminal of the capacitor C1 is connected to the first terminal of the resistor R4, and a second terminal of the capacitor C1 is connected to the collector of the transistor Q2.
5. The intelligent building smoke alarm system according to claim 1, further comprising a signal conditioning circuit, wherein the signal conditioning circuit comprises a capacitor C2, an operational amplifier U1, a resistor R12, a resistor R13, an operational amplifier U2 and a resistor R14, a first end of the capacitor C2 is connected with an output end of the fire sensor P1, a second end of the capacitor C2 is connected with an in-phase input end of the operational amplifier U1, an output end of the operational amplifier U1 is connected with an inverting input end of the operational amplifier U1, an output end of the operational amplifier U1 is connected with an in-phase input end of the operational amplifier U2 through the resistor R12, an inverting input end of the operational amplifier U2 is grounded through the resistor R13, an output end of the operational amplifier U2 is connected with an inverting input end of the operational amplifier U2 through the resistor R14, and an output end of the operational amplifier U2 is connected with a first input end of the main control unit.
6. The intelligent building smoke alarm system according to claim 5, further comprising a band-pass filter circuit, wherein the band-pass filter circuit comprises a resistor R15, a resistor R16, a capacitor C4, a capacitor C5, an operational amplifier U4 and a resistor R17, a first end of the resistor R15 is connected with an output end of the operational amplifier U2, a second end of the resistor R15 is grounded through the resistor R16, a second end of the resistor R15 is connected with an inverting input end of the operational amplifier U4 through the capacitor C5, a non-inverting input end of the operational amplifier U4 is grounded, an output end of the operational amplifier U4 is connected with a second end of the resistor R15 through the capacitor C4, an output end of the operational amplifier U4 is connected with an inverting input end of the operational amplifier U4 through the resistor R17, and an output end of the operational amplifier U4 is connected with a first input end of the main control unit.
7. The intelligent building smoke alarm system according to claim 1, further comprising an alarm circuit, wherein the alarm circuit comprises an optocoupler U5, a resistor R21, a resistor R20, a switch tube Q7, a resistor R19 and an alarm B1, a first input end of the optocoupler U5 is connected with a first output end of the main control unit, a second input end of the optocoupler U5 is grounded, a first output end of the optocoupler U5 is connected with a 12V power supply through the resistor R21, a second output end of the optocoupler U5 is connected with a control end of the switch tube Q7 through the resistor R20, a first end of the switch tube Q7 is connected with a first end of the alarm B1, a second end of the alarm B1 is connected with a 12V power supply, and a second end of the switch tube Q7 is grounded through the resistor R19.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221281592U true CN221281592U (en) | 2024-07-05 |
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| Date | Code | Title | Description |
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| GR01 | Patent grant |