CN111127818A - NB-IoT smoke sensing control system - Google Patents

NB-IoT smoke sensing control system Download PDF

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Publication number
CN111127818A
CN111127818A CN201911243988.3A CN201911243988A CN111127818A CN 111127818 A CN111127818 A CN 111127818A CN 201911243988 A CN201911243988 A CN 201911243988A CN 111127818 A CN111127818 A CN 111127818A
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resistor
processing unit
pin
capacitor
central processing
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胡进
赵强
陶水娟
邬权松
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Zhejiang Dabong Tech Co Ltd
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Zhejiang Dabong Tech Co Ltd
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission

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  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Fire Alarms (AREA)

Abstract

The invention discloses an NB-IoT smoke sensing control system, which comprises a processing unit, a communication unit, a sound unit, a voltage sampling circuit, a photoelectric labyrinth circuit, a key module and a battery pack, wherein the communication unit, the sound unit, the voltage sampling circuit, the photoelectric labyrinth circuit, the key module and the battery pack are electrically connected with the processing unit; the invention provides the NB-IoT smoke sensation control system which effectively prolongs the service life of the battery with the NB-IoT independent smoke sensation, effectively reduces the frequency of replacing the battery and prolongs the service life of the battery.

Description

NB-IoT smoke sensing control system
Technical Field
The invention relates to the technical field of fire fighting equipment, in particular to an NB-IoT smoke sensation control system.
Background
The smoke detector is a fire-fighting electronic product, alarms by sensing smoke, and avoids greater loss caused by fire. The traditional smoke feeling is mainly divided into: a wired smoke sensation and a free-standing smoke sensation. Wired smoke is felt and needs wired power supply, need not consider network deployment control, but the wiring has the difficulty, and it is more troublesome later to reequip.
The independent smoke sensor can work by using a battery without considering wired power supply. But without the cable, there is no way to perform centralized monitoring management. When a fire occurs, the fire alarm can be only carried out on the fire scene, and if no person exists on the fire scene, other persons cannot know the fire. Therefore, it is very necessary to perform networking monitoring by using independent smoke sensations.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides the NB-IoT smoke sensation control system which effectively prolongs the service life of the battery of the NB-IoT independent smoke sensation, effectively reduces the frequency of battery replacement and prolongs the service life of the battery.
The technical scheme of the invention is as follows:
an NB-IoT smoke sensing control system comprises a processing unit, a communication unit, a sound unit, a voltage sampling circuit, a photoelectric labyrinth circuit, a key module and a battery pack, wherein the communication unit, the sound unit, the voltage sampling circuit, the photoelectric labyrinth circuit, the key module, the battery pack and the processing unit are electrically connected.
Further, the voltage sampling circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a transistor Q1, a transistor Q2 and a capacitor C1; one end of the resistor R1 and the collector of the transistor Q2 are connected with VCC together, the emitter of the transistor Q2 is connected with one end of the resistor R3, the base of the transistor Q2 is connected with one end of the resistor R2, the other end of the resistor R3, one end of the resistor R4 and one end of the capacitor C1 are connected with a No. 12 pin of a central processing unit of the processing unit, and the other end of the resistor R4 and the other end of the capacitor C1 are grounded; the other end of the resistor R1 and the other end of the resistor R2 are connected with the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected with one end of the resistor R5, and the other end of the resistor R5 is connected with the pin No. 13 of the central processing unit of the processing unit.
Further, the communication unit comprises a resistor R13, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a capacitor C11, a capacitor C12, an NPN triode Q6, a PNP triode Q7, an NB-IoT module U202 and an antenna;
one end of the resistor R13 is connected with pin No. 34 of a central processing unit of the processing unit, the other end of the resistor R13 is connected with a base electrode of an NPN triode Q6, a collector electrode of the NPN triode Q6 is connected with one end of the resistor R18 and one end of the resistor R19, the other end of the resistor R18 and a collector electrode of the PNP triode Q7 are connected with VCC, the other end of the resistor R19 is connected with a base electrode of a PNP triode Q7, and an emitter electrode of PNP is connected with pin VCC No. 1 of the NB-IoT module U202; an emitter of the NPN triode Q6 is grounded together with one end of the capacitor C11, the other end of the capacitor C11 is connected with one end of the resistor R21, the pin No. 31 of the central processing unit of the processing unit, and the pin No. 3 TXD of the NB-IoT module U202, the other end of the resistor R21 is connected with one end of the resistor R20 and the pin No. 1 VCC of the NB-IoT module U202, the other end of the resistor R20 is connected with one end of the capacitor C12 together with the pin No. 30 of the central processing unit and the pin No. 4 RXD of the NB-IoT module U202, the other end of the capacitor C12 is grounded together with the pin No. 2 VSS of the NB-IoT module U202, the pin No. 5 resett of the NB-IoT module U202 is connected with the pin No. 29 of the central processing unit, and the pin No. 6 of the NB-.
Furthermore, the photoelectric labyrinth circuit comprises an infrared light transmitting circuit and an infrared light receiving circuit, and the infrared light transmitting circuit and the infrared light receiving circuit are electrically connected with a central processing unit of the processing unit;
the infrared light emitting circuit comprises a resistor R8, a resistor R9, a resistor R10, an NPN triode Q3 and an infrared light emitting diode D1, wherein one end of the resistor R8 is connected with a pin 14 of a central processing unit of the processing unit, the other end of the resistor R8 is connected with one end of the resistor R9 and a base of the NPN triode Q3, an emitter of the NPN triode Q3 is grounded with the other end of the resistor R9, a collector of the NPN triode Q3 is connected with a cathode of the infrared light emitting diode D1, an anode of the infrared light emitting diode D1 is connected with one end of the resistor R10, and the other end of the resistor R10 is connected with VCC;
the infrared light receiving circuit comprises an infrared receiving diode D2, a PNP triode Q4, a resistor R11 and a resistor R12, one end of the resistor R12 and a collector of the PNP triode Q4 are connected with a pin number of a Central Processing Unit (CPU) 22 of the processing unit, a base of the PNP triode Q4 is connected with one end of the resistor R11 and a cathode of the infrared receiving diode D2, the other end of the resistor R11 and an emitter of the PNP triode Q4 are connected with VCC together, and an anode of the infrared receiving diode and the other end of the resistor R12 are connected with the ground together.
Further, the sounding unit comprises a resistor R15, a resistor R16, a resistor R17, a capacitor C9, an NPN transistor Q5, and a buzzer B1, wherein one end of the resistor R15 is electrically connected to a pin of the central processing unit 25 of the processing unit, the other end of the resistor R15 is connected to one end of the resistor R16, one end of the capacitor C9, and a base of the NPN transistor Q5, an emitter of the NPN transistor Q5 is grounded together with the other end of the resistor R16 and the other end of the capacitor C9, a collector of the NPN transistor Q5 is connected to one end of the buzzer B1, the other end of the buzzer B1 is connected to one end of the resistor R17, and the other end of the resistor R17 is connected to VCC.
Further, the key module and the battery pack, the battery pack provides power to form VCC, the key module includes a resistor R7, a capacitor C6 and a switch S1; one end of the switch S1 is connected to VCC, the other end is connected to pin No. 43 of the CPU, pin No. 43 of the CPU is further connected to one end of the resistor R7 and one end of the capacitor C6, and the other end of the resistor R7 and the other end of the capacitor C6 are grounded.
When the voltage of the battery pack needs to be detected, the pin 13 of the central processing unit U201 of the processing unit outputs high level, so that the transistor Q1 and the triode Q2 are conducted. The voltage VCC is applied to a voltage dividing circuit composed of a resistor R3, a resistor R4, and a capacitor C1, and then is input to pin No. 12 of the cpu U201. When the battery pack voltage detection is not needed, pin 13 of the central processing unit U201 outputs a low level, turning off the transistor Q1 and the transistor Q2. At the moment, no voltage exists on the voltage dividing circuit of the resistor R3, the resistor R4 and the capacitor C1, so that the circuit avoids the loss of the battery capacity caused by the fact that a sampling circuit is directly connected to the battery pack, the battery capacity is saved, the energy consumption is reduced, and the service life is prolonged.
The central processing unit U201 of the invention realizes the power control of the NB-IoT module U202 by controlling the NPN triode Q6. When pin 34 of the central processing unit U201 outputs a high level, the NPN transistor Q6 is turned on, and at this time, the collector of the NPN transistor Q6 is at a low level, so that the PNP transistor Q7 is turned on and the power supply voltage VCC is applied to the power supply terminal of the NB-IoT module U202. When wireless communication is needed, the power supply of the NB-IoT module U202 is turned on through the central processing unit U201, and the NB-IoT module U202 works normally. When the pin 34 of the central processing unit U201 outputs a low level, the NPN transistor Q6 is turned off, and at this time, the collector of the NPN transistor Q6 is at a high level, so the PNP transistor Q7 is turned off, the power supply voltage VCC cannot be applied to the power supply terminal of the NB-IoT module U202, and the NB-IoT module U202 does not have a working voltage. When wireless communication is not required, the NB-IoT module U202 is powered off by the central processor U201. The problem of battery power consumption of the NB-IoT module when the NB-IoT module does not communicate is effectively solved.
The independent photoelectric smoke-sensing fire detection alarm is internally provided with a photoelectric labyrinth circuit which avoids the interference of ambient light and is used as a smoke particle detection chamber. The distribution of the infrared light emitting diode D1 and the infrared receiving diode D2 in the maze is shown in FIG. 3. The infrared light emitting diode D1 and the infrared receiving diode D2 are distributed in the same plane at an acute angle or an obtuse angle, and the infrared receiving diode D2 cannot receive the light of the infrared light emitting diode D1 at ordinary times.
The invention has wide applicability, low cost and easy popularization and use.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a circuit diagram of an embodiment of the present invention;
FIG. 3 is a schematic diagram of the optoelectronic labyrinth circuit of the present invention;
fig. 4 shows the power consumption during a battery cycle according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
as shown in fig. 1 and 2, an NB-IoT smoke sensation control system includes a processing unit, a communication unit, a sound unit, a voltage sampling circuit, a photoelectric labyrinth circuit, a key module, and a battery pack, wherein the communication unit, the sound unit, the voltage sampling circuit, the photoelectric labyrinth circuit, the key module, and the battery pack are electrically connected to the processing unit.
The voltage sampling circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a transistor Q1, a transistor Q2 and a capacitor C1; one end of the resistor R1 and the collector of the transistor Q2 are connected with VCC, the emitter of the transistor is connected with one end of the resistor R3, the base of the transistor is connected with one end of the resistor R2, the other end of the resistor R3, one end of the resistor R4 and one end of the capacitor C1 are connected with a No. 12 pin of a central processing unit (which can adopt a 51 singlechip or the like) of the processing unit, and the other end of the resistor R4 and the other end of the capacitor C1 are grounded; the other end of the resistor R1 and the other end of the resistor R2 are connected with the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected with one end of the resistor R5, and the other end of the resistor R5 is connected with the pin No. 13 of the central processing unit of the processing unit. When the voltage of the battery pack needs to be detected, a pin 13 of the central processing unit U201 of the processing unit outputs a high level, so that the transistor Q1 and the triode Q2 are turned on. The voltage VCC is applied to a voltage dividing circuit composed of a resistor R3, a resistor R4, and a capacitor C1, and then is input to pin No. 12 of the cpu U201. When the battery pack voltage detection is not needed, pin 13 of the central processing unit U201 outputs a low level, turning off the transistor Q1 and the transistor Q2. At the moment, no voltage exists on the voltage dividing circuit of the resistor R3, the resistor R4 and the capacitor C1, so that the circuit avoids the loss of the battery capacity caused by the fact that a sampling circuit is directly connected to the battery pack, the battery capacity is saved, the energy consumption is reduced, and the service life is prolonged.
The communication unit comprises a resistor R13, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a capacitor C11, a capacitor C12, an NPN triode Q6, a PNP triode Q7, an NB-IoT module U202 and an antenna.
One end of the resistor R13 is connected with pin No. 34 of a central processing unit of the processing unit, the other end of the resistor R13 is connected with a base electrode of an NPN triode Q6, a collector electrode of the NPN triode Q6 is connected with one end of the resistor R18 and one end of the resistor R19, the other end of the resistor R18 and a collector electrode of the PNP triode Q7 are connected with VCC, the other end of the resistor R19 is connected with a base electrode of a PNP triode Q7, and an emitter electrode of PNP is connected with pin No. 1 of the NB-IoT module U202; an emitter of the NPN triode Q6 is grounded together with one end of the capacitor C11, the other end of the capacitor C11 is connected with one end of the resistor R21, the pin No. 31 of the central processing unit of the processing unit, and the pin No. 3 of the NB-IoT module U202, the other end of the resistor R21 is connected with one end of the resistor R20 and the pin No. 1 of the NB-IoT module U202, the other end of the resistor R20 is connected with one end of the capacitor C12 together with the pin No. 30 of the central processing unit and the pin No. 4 of the NB-IoT module U202, the other end of the capacitor C12 is grounded together with the pin No. 2 of the NB-IoT module U202, the pin No. 5 of the NB-IoT module U202 is connected with the pin No. 29 of the central processing unit, and the pin No. 6 of the NB-.
The central processor U201 controls the power supply of the NB-IoT module U202 by controlling the NPN transistor Q6. When pin 34 of the central processing unit U201 outputs a high level, the NPN transistor Q6 is turned on, and at this time, the collector of the NPN transistor Q6 is at a low level, so that the PNP transistor Q7 is turned on and the power supply voltage VCC is applied to the power supply terminal of the NB-IoT module U202. When wireless communication is needed, the power supply of the NB-IoT module U202 is turned on through the central processing unit U201, and the NB-IoT module U202 works normally.
When the pin 34 of the central processing unit U201 outputs a low level, the NPN transistor Q6 is turned off, and at this time, the collector of the NPN transistor Q6 is at a high level, so the PNP transistor Q7 is turned off, the power supply voltage VCC cannot be applied to the power supply terminal of the NB-IoT module U202, and the NB-IoT module U202 does not have a working voltage. When wireless communication is not required, the NB-IoT module U202 is powered off by the central processor U201. The problem of battery power consumption of the NB-IoT module when the NB-IoT module does not communicate is effectively solved.
The photoelectric labyrinth circuit comprises an infrared light transmitting circuit and an infrared light receiving circuit, and the infrared light transmitting circuit and the infrared light receiving circuit are electrically connected with a central processing unit of the processing unit;
the infrared light emitting circuit comprises a resistor R8, a resistor R9, a resistor R10, an NPN triode Q3 and an infrared light emitting diode D1, wherein one end of the resistor R8 is connected with a pin 14 of a central processing unit of the processing unit, the other end of the resistor R8 is connected with one end of the resistor R9 and a base of the NPN triode Q3, an emitter of the NPN triode Q3 is grounded with the other end of the resistor R9, a collector of the NPN triode Q3 is connected with a cathode of the infrared light emitting diode D1, an anode of the infrared light emitting diode D1 is connected with one end of the resistor R10, and the other end of the resistor R10 is connected with VCC. When the PA4 outputs a high level, the transistor Q3 is turned on, so that the infrared led D1 is turned on to generate infrared light.
The infrared light receiving circuit comprises an infrared receiving diode D2, a PNP triode Q4, a resistor R11 and a resistor R12, one end of the resistor R12 and a collector of the PNP triode Q4 are connected with a pin number of a Central Processing Unit (CPU) 22 of the processing unit, a base of the PNP triode Q4 is connected with one end of the resistor R11 and a cathode of the infrared receiving diode D2, the other end of the resistor R11 and an emitter of the PNP triode Q4 are connected with VCC together, and an anode of the infrared receiving diode and the other end of the resistor R12 are connected with the ground together.
When the pin No. 14 of the central processing unit outputs low level, the NPN triode Q3 is turned off, the infrared light emitting diode D1 is turned off, and no infrared light is generated. When the infrared receiving diode D2 cannot receive infrared light, its reverse resistance reaches hundreds of mega ohms, which is much larger than the resistance of the resistor R11, so the divided voltage is high voltage, the PNP triode Q4 is turned off, the level on the resistor R12 is low level, and the potential detected by pin No. 22 of the central processing unit U201 is low level.
When the pin 14 of the central processing unit outputs a high level, the NPN triode Q3 is turned on, the infrared light emitting diode D1 generates infrared light, when the infrared light receiving diode D2 receives the infrared light, the resistance of the infrared receiving diode D2 decreases exponentially, the voltage on the infrared receiving diode D2 also decreases, the PNP triode Q4 is turned on at this time, the resistance R12 is a high level, and the pin 22 of the central processing unit U201 detects the high level.
The independent photoelectric smoke-sensing fire detection alarm is internally provided with a photoelectric labyrinth circuit which avoids the interference of ambient light and is used as a smoke particle detection chamber. The distribution of the infrared light emitting diode D1 and the infrared receiving diode D2 in the maze is shown in FIG. 3. The infrared light emitting diode D1 and the infrared receiving diode D2 are distributed in the same plane at an acute angle or an obtuse angle, and the infrared receiving diode D2 cannot receive the light of the infrared light emitting diode D1 at ordinary times.
The sounding unit comprises a resistor R15, a resistor R16, a resistor R17, a capacitor C9, an NPN triode Q5 and a buzzer B1, one end of the resistor R15 is electrically connected with a pin of the central processing unit 25 of the processing unit, the other end of the resistor R15 is connected with one end of the resistor R16, one end of the capacitor C9 and a base of the NPN triode Q5, an emitter of the NPN triode Q5 is grounded with the other end of the resistor R16 and the other end of the capacitor C9, a collector of the NPN triode Q5 is connected with one end of the buzzer B1, the other end of the buzzer B1 is connected with one end of the resistor R17, and the other end of the resistor R17 is connected with VCC. When the pin 25 of the central processing unit U201 outputs a high level, the NPN transistor Q5 is turned on, and at this time, a current flows through the buzzer B1, and the buzzer B1 alarms. When the pin 25 of the central processing unit U201 outputs a low level, the NPN transistor Q5 turns off, no current flows through the buzzer B1, and the buzzer B1 does not alarm.
The key module and the battery pack provide power to form VCC, the anode of the battery pack is connected to the VCC end of each circuit, and the cathode of the battery pack is connected to the grounding end of each circuit. The key module comprises a resistor R7, a capacitor C6 and a switch S1; one end of the switch S1 is connected to VCC, the other end is connected to pin No. 43 of the CPU, pin No. 43 of the CPU is further connected to one end of the resistor R7 and one end of the capacitor C6, and the other end of the resistor R7 and the other end of the capacitor C6 are grounded. After the buzzer B1 alarms, and the switch S1 is pressed, the voltage on the resistor R7 is at a high level, and when the pin No. 43 of the central processing unit U201 detects the high level, the central processing unit U201 executes a corresponding instruction. Mainly after the alarm circuit begins to alarm, the circuit plays a role in silencing.
In summary, when no fire occurs, the pin 14 of the cpu U201 operates for hundreds of microseconds every few seconds to output a high level to drive the NPN transistor Q3 to be turned on, so that the infrared light emitting diode D1 operates intermittently to save battery energy. Even if the infrared light emitting diode D1 emits a pulse light beam, the infrared receiving diode D2 does not generate a photocurrent because it does not receive the emitted light, and at this time, pin 25 of the cpu U201 outputs a low level, and the buzzer B1 does not operate. The central processing unit U201 controls the power VCC to output to the power supply end of the NB-IoT module U202 every other time period, for example, 24 hours, the central processing unit U201 communicates with the serial port of the NB-IoT module U202 through the serial port No. 30 pin and No. 31 pin, and the operation data is wirelessly transmitted to the server and the terminal equipment through the NB-IoT module U202. When the communication is completed, pin 34 of the central processing unit U201 outputs a low level to turn off the power supply of the NB-IoT module U202.
Similarly, in a set period, pin 13 of the central processing unit U201 outputs a high level to turn on the transistor Q1, the voltage on the resistor R4 is sampled through pin 12 of the central processing unit U201, the voltage condition of the battery is sequentially judged, if the voltage is normal, pin 13 of the central processing unit U201 outputs a low level to turn off the transistor Q1, if the voltage is abnormal, pin 25 of the central processing unit U201 outputs a high level to drive the buzzer B1 to alarm, the operating voltage of the NB-IoT module U202 is controlled through pin 34 of the central processing unit U201, so that the NB-IoT module U202 operates normally, the central processing unit U201 sends abnormal voltage data to the NB-IoT module U202, and the NB-IoT module U202 sends data to the server and the user terminal.
In case of fire, smoke particles enter the photoelectric labyrinth, and because the smoke particles scatter the light emitted by the ir led D1, some of the scattered light is received by the ir receiving diode D2, and the ir receiving diode D2 generates weak photocurrent, so that the transistor Q4 is turned on, and because the ir emitting diode D1 generates intermittent pulses, the ir receiving diode D2 receives intermittent infrared light. The transistor Q4 is also intermittently turned on, and an intermittent pulse with high and low levels is generated on the resistor R12, and the cpu U201 outputs high level on pin 25 according to the level detected by pin 22 on the cpu U, so as to drive the buzzer B1 to sound. Meanwhile, a pin 34 of the central processing unit U201 outputs a high level to supply power to the NB-IoT module U202, the central processing unit U201 sends an alarm signal to the NB-IoT module U202 through a serial port, and the NB-IoT module U202 sends the received alarm signal to a server platform and a user terminal. Reminding people to escape or extinguish fire quickly.
The power consumption of the independent photoelectric smoke detection alarm is expressed by the following formula:
Q＝QS(t)+Qsignal(n)+Qalarm(m) formula (1)
Wherein Q is the total power consumed by smoke, QS(t) average standby power, Q, for smoke sensationsignalAverage power loss, Q, for NB-IoT circuit communicationalarmAnd (m) is the average power consumption of the acoustic circuit.
The standby average power for smoke sensation is expressed as:
QS(t)＝ISt formula (2)
Where Is the standby consumption current. t is the standby time.
The average power loss and consumption in NB-IoT circuit communication is represented as:
Figure BDA0002307008040000101
wherein n is the number of communication times, and K is a constant, because the components of the whole circuit are all fixed, the power consumption can be approximately expressed by a constant. S is the signal value. The signal value is inversely proportional to the amount of power consumed, i.e., the weaker the signal, the more power is consumed. The stronger the signal, the less power is consumed.
The acoustic circuit loss average power is expressed as:
Qalarm(m)＝m·qalarmformula (4)
Wherein m is the number of alarm times, qalarmThe electric quantity consumption is reported to the police for a single time.
Substituting equation 2, equation 3, equation 4 into equation 1 can obtain:
Figure BDA0002307008040000102
it can be seen that in IS、K、S、qalarmUnder certain conditions, the consumption of the electric quantity is mainly related to the standby time length t, the communication times n and the alarm times m of the alarm. The smaller the number of communications, the smaller the power consumption. Whose power consumption in one battery cycle can be approximated by a graphIn the figure, t is a period of power consumption of the battery, Qb is the power of the battery, QL is an under-voltage alarm value of the battery, an area is an approximate representation of the power consumption Q of the smoke sensation over time, the power consumption of the battery is related to the rising slope of the area, and △ Q represents the power consumption of each stage.
From △ q (t)n+1-tn)>△q(tn-tn-1) It can be seen that at tn～tn+1The power consumption of the stage is higher than tn-1～tnAnd (5) stage. It can be seen that the smaller the slope, the less power is consumed. The longer the life cycle of the battery. Therefore, the scheme achieves the purpose of reducing power consumption through the design of the central processing unit U201 on the NB-IoT module U202 and the control design of the voltage sampling circuit. And power consumption brought by communication is reduced by changing the number of times of communication in the case where the standby power consumption is determined. The smoke detector reports data regularly through the NB-IoT module U202, and the main purpose is to monitor whether the smoke detector operates normally. The current commonly used running data is reported for 23h at regular time, and the service life of the battery is generally 2 years. In the scheme, under the condition that the signal value S is constant, if the periodic time for reporting the data at regular time is increased, namely the number of communication times n is reduced, the power consumption of the smoke-sensitive NB-IoT module is reduced. In the region where the power consumption Q is larger as the signal value S is smaller, it is more necessary to reduce the number of communications n, and the power consumption due to the signal difference can be compensated for. So as to prolong the service time of the whole battery.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the spirit of the present invention, and these modifications and decorations should also be regarded as being within the scope of the present invention.

Claims (5)

1. An NB-IoT smoke sensation control system, characterized in that: the device comprises a processing unit, a communication unit, a sound unit, a voltage sampling circuit, a photoelectric labyrinth circuit, a key module and a battery pack, wherein the communication unit, the sound unit, the voltage sampling circuit, the photoelectric labyrinth circuit, the key module and the battery pack are electrically connected with the processing unit;
the key module comprises a resistor R7, a capacitor C6 and a switch S1; one end of the switch S1 is connected to VCC, the other end is connected to pin No. 43 of the CPU, pin No. 43 of the CPU is further connected to one end of the resistor R7 and one end of the capacitor C6, and the other end of the resistor R7 and the other end of the capacitor C6 are grounded.
2. The NB-IoT smoke sensation control system according to claim 1, wherein: the voltage sampling circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a transistor Q1, a transistor Q2 and a capacitor C1; one end of the resistor R1 and the collector of the transistor Q2 are connected with VCC, the emitter of the transistor is connected with one end of the resistor R3, the base of the transistor is connected with one end of the resistor R2, the other end of the resistor R3, one end of the resistor R4 and one end of the capacitor C1 are connected with the No. 12 pin of the central processing unit of the processing unit, and the other end of the resistor R4 and the other end of the capacitor C1 are grounded; the other end of the resistor R1 and the other end of the resistor R2 are connected with the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected with one end of the resistor R5, and the other end of the resistor R5 is connected with the pin No. 13 of the central processing unit of the processing unit.
3. The NB-IoT smoke sensation control system according to claim 1, wherein: the communication unit comprises a resistor R13, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a capacitor C11, a capacitor C12, an NPN triode Q6, a PNP triode Q7, an NB-IoT module U202 and an antenna;
one end of the resistor R13 is connected with pin No. 34 of a central processing unit of the processing unit, the other end of the resistor R13 is connected with a base electrode of an NPN triode Q6, a collector electrode of the NPN triode Q6 is connected with one end of the resistor R18 and one end of the resistor R19, the other end of the resistor R18 and a collector electrode of the PNP triode Q7 are connected with VCC, the other end of the resistor R19 is connected with a base electrode of a PNP triode Q7, and an emitter electrode of PNP is connected with pin No. 1 of the NB-IoT module U202; an emitter of the NPN triode Q6 is grounded together with one end of the capacitor C11, the other end of the capacitor C11 is connected with one end of the resistor R21, the pin No. 31 of the central processing unit of the processing unit, and the pin No. 3 of the NB-IoT module U202, the other end of the resistor R21 is connected with one end of the resistor R20 and the pin No. 1 of the NB-IoT module U202, the other end of the resistor R20 is connected with one end of the capacitor C12 together with the pin No. 30 of the central processing unit and the pin No. 4 of the NB-IoT module U202, the other end of the capacitor C12 is grounded together with the pin No. 2 of the NB-IoT module U202, the pin No. 5 of the NB-IoT module U202 is connected with the pin No. 29 of the central processing unit, and the pin No. 6 of the NB-.
4. The NB-IoT smoke sensation control system according to claim 1, wherein: the photoelectric labyrinth circuit comprises an infrared light transmitting circuit and an infrared light receiving circuit, and the infrared light transmitting circuit and the infrared light receiving circuit are electrically connected with a central processing unit of the processing unit;
the infrared light emitting circuit comprises a resistor R8, a resistor R9, a resistor R10, an NPN triode Q3 and an infrared light emitting diode D1, wherein one end of the resistor R8 is connected with a pin 14 of a central processing unit of the processing unit, the other end of the resistor R8 is connected with one end of the resistor R9 and a base of the NPN triode Q3, an emitter of the NPN triode Q3 is grounded with the other end of the resistor R9, a collector of the NPN triode Q3 is connected with a cathode of the infrared light emitting diode D1, an anode of the infrared light emitting diode D1 is connected with one end of the resistor R10, and the other end of the resistor R10 is connected with VCC;
the infrared light receiving circuit comprises an infrared receiving diode D2, a PNP triode Q4, a resistor R11 and a resistor R12, one end of the resistor R12 and a collector of the PNP triode Q4 are connected with a pin number of a Central Processing Unit (CPU) 22 of the processing unit, a base of the PNP triode Q4 is connected with one end of the resistor R11 and a cathode of the infrared receiving diode D2, the other end of the resistor R11 and an emitter of the PNP triode Q4 are connected with VCC together, and an anode of the infrared receiving diode and the other end of the resistor R12 are connected with the ground together.
5. The NB-IoT smoke sensation control system according to claim 1, wherein: the sounding unit comprises a resistor R15, a resistor R16, a resistor R17, a capacitor C9, an NPN triode Q5 and a buzzer B1, one end of the resistor R15 is electrically connected with a pin of the central processing unit 25 of the processing unit, the other end of the resistor R15 is connected with one end of the resistor R16, one end of the capacitor C9 and a base of the NPN triode Q5, an emitter of the NPN triode Q5 is grounded with the other end of the resistor R16 and the other end of the capacitor C9, a collector of the NPN triode Q5 is connected with one end of the buzzer B1, the other end of the buzzer B1 is connected with one end of the resistor R17, and the other end of the resistor R17 is connected with VCC.
CN201911243988.3A 2019-12-06 2019-12-06 NB-IoT smoke sensing control system Pending CN111127818A (en)

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Application publication date: 20200508