Fire extinguishing control circuit board and smoke sensing fire extinguishing system

Abstract

The utility model relates to a fire extinguishing control circuit board and a smoke sensing fire extinguishing system. A dual-power supply circuit is used for supplying power; the smoke acquisition circuit is connected with a smoke sensor and is used for acquiring a smoke sensing signal generated by the smoke sensor and sending the smoke sensing signal to the microcontroller; the temperature acquisition circuit is connected with the temperature sensor and is used for acquiring a temperature value output by the temperature sensor and sending the temperature value to the microcontroller; the microcontroller is used for receiving the smoke sensing signal and the temperature value, and outputting a fire extinguishing trigger signal to the fire extinguishing driving circuit when the smoke sensing signal accords with a preset level and / or the temperature value is greater than a preset value; the fire extinguishing drive circuit is connected with the fire extinguishing unit and used for starting the fire extinguishing unit after receiving the fire extinguishing trigger signal. According to the utility model, the problem that the existing smoke sensing alarm system cannot extinguish fire in time is solved, and the purpose of controlling the fire extinguishing unit to extinguish the fire at the first time when the fire is found is realized.

Description

Technical Field

[0001] The utility model relates to the field of fire protection, in particular to a fire extinguishing control circuit board and a smoke sensing fire extinguishing system. Background Art

[0002] A fire extinguishing unit is a fire extinguishing tool. Chemicals are placed in the fire extinguishing unit to extinguish fires. Fire extinguishing units are one of the common fire prevention facilities, stored in public places or places where fires may occur. Different types of fire extinguishing units are filled with different ingredients and are designed for different causes of fire.

[0003] In order to monitor the disaster situation, the existing technology uses smoke alarms for early warning, but early warning alone is far from enough. According to the current fire protection system and environment in my country, after a fire warning occurs in unmanned warehouses and places, the best time to extinguish the fire is often missed by the time firefighters arrive at the fire scene: that is, within tens of seconds at the initial stage of the fire. By the time the fire starts, even if rescue efforts are made, it has often caused certain property losses. Therefore, a device is needed that can automatically extinguish the fire as soon as the fire is detected. Utility Model Content

[0004] The embodiments of the utility model provide a fire extinguishing control circuit board and a smoke fire extinguishing system, so as to at least solve the problem that the existing smoke alarm system in the related art cannot extinguish the fire in time.

[0005] In a first aspect, an embodiment of the utility model provides a fire extinguishing control circuit board, including a microcontroller, a dual power supply circuit, a fire extinguishing drive circuit, a smoke collection circuit and a temperature collection circuit; wherein,

[0006] The dual power supply circuit is used to supply power to the microcontroller, the fire extinguishing drive circuit, the smoke collection circuit and the temperature collection circuit;

[0007] The smoke collection circuit is connected to the smoke sensor, and is used to collect the smoke sensing signal generated by the smoke sensor, and send the smoke sensing signal to the microcontroller;

[0008] The temperature acquisition circuit is connected to the temperature sensor, and is used to acquire the temperature value output by the temperature sensor, and send the temperature signal to the microcontroller;

[0009] The microcontroller is used to receive the smoke sensing signal and the temperature signal, and when the smoke sensing signal and / or the temperature signal meets the preset state, output a fire extinguishing trigger signal to the fire extinguishing driving circuit;

[0010] The fire extinguishing driving circuit is connected to the fire extinguishing unit and is used to start the fire extinguishing unit after receiving a fire extinguishing trigger signal.

[0011] In one embodiment, the fire extinguishing control circuit board further includes a power switching unit and an alarm unit, and the power switching unit and the alarm unit are respectively connected to the microcontroller, wherein:

[0012] The power switching unit is used to output a power mode switching signal to the microcontroller, and the microcontroller adjusts the working mode of the dual power supply circuit after receiving the power mode switching signal, and the working mode includes a high power consumption power supply mode and a low power consumption power supply mode;

[0013] The microcontroller is also used to send a warning signal to the alarm unit when the smoke signal and / or the temperature signal meets a preset state;

[0014] The alarm unit is used to receive the warning signal and emit a warning sound or a warning light according to the warning signal.

[0015] In one embodiment, the dual power supply circuit includes a first power supply unit and a second power supply unit; wherein,

[0016] The first power supply unit comprises an internal battery and a first voltage divider module, wherein the input end of the first voltage divider module is connected to the internal battery, and the output end is connected to the microcontroller;

[0017] An input end of the second power supply unit is connected to an external power supply, and an output end of the second power supply unit is connected to the microcontroller.

[0018] In one embodiment, the dual power supply circuit further includes a voltage detection circuit, wherein the input end of the voltage detection circuit is connected to the external power supply, and the output end of the voltage detection circuit is connected to the microcontroller;

[0019] The voltage detection circuit is used to detect the voltage of the external power supply input and output a detection signal to the main control module, so that the microcontroller determines whether to adjust the working mode of the dual power supply circuit according to the detection signal.

[0020] In one embodiment, the voltage detection circuit includes a first diode, a first resistor, a second resistor and a first transistor;

[0021] Among them, the anode of the first diode is connected to the external power supply, the cathode of the first diode is connected to the first end of the first resistor, the second end of the first resistor is coupled with the first end of the second resistor and the base of the first transistor, the second end of the second resistor and the emitter of the first transistor are grounded, and the emitter of the first transistor is connected to the microcontroller.

[0022] In one embodiment, the fire extinguishing driving circuit includes a second resistor, a second triode, a third resistor and a MOS tube; wherein,

[0023] The first end of the second resistor is connected to the microcontroller, the second end is connected to the base of the second transistor, the emitter of the second transistor is grounded, the collector of the second transistor is connected to the first end of the third resistor and the gate of the MOS tube, the second end of the third resistor and the drain of the MOS tube are connected to the dual power supply circuit, and the source of the MOS tube is connected to the fire extinguishing unit.

[0024] In one embodiment, the fire extinguishing control circuit board further includes a communication circuit, and the communication circuit is used to realize data transmission between an external device and the microcontroller.

[0025] In one embodiment, the power switching unit includes a fourth resistor, a fifth resistor and an electronic switch; wherein,

[0026] The first end of the electronic switch is grounded, the second end of the electronic switch is connected to the first end of the fourth resistor and the first end of the fifth resistor, the second end of the fourth resistor is connected to a power supply, and the second end of the fifth resistor is connected to the microcontroller.

[0027] In one embodiment, the alarm unit includes a sixth resistor and a first light emitting diode, wherein:

[0028] The sixth resistor is connected between the anode of the first light emitting diode and the microcontroller, and the cathode of the first light emitting diode is grounded;

[0029] When the alarm unit receives the warning signal, the first light emitting diode emits light.

[0030] In a second aspect, an embodiment of the utility model provides a smoke-sensing fire extinguishing system, comprising a fire extinguishing unit, a smoke sensor, a temperature sensor, and a fire extinguishing control circuit board as described in any one of the above embodiments; the fire extinguishing unit is connected to the output end of the fire extinguishing drive circuit, the smoke sensor is connected to the smoke collection circuit, and the temperature sensor is connected to the temperature collection circuit;

[0031] The smoke sensor is used to detect the smoke condition in the current environment and generate a smoke sensing signal; the temperature sensor is used to detect the temperature condition in the current environment and output a temperature value;

[0032] The fire extinguishing control circuit board is used to receive the smoke sensing signal and the temperature value. When the smoke sensing signal meets a preset level and / or the temperature value is greater than a preset value, the fire extinguishing control circuit board starts the fire extinguishing unit.

[0033] The fire extinguishing control circuit board and smoke fire extinguishing system provided by the embodiment of the utility model have at least the following technical effects:

[0034] The utility model includes a microcontroller receiving a smoke sensor signal and a temperature value, and when the smoke sensor signal meets a preset level and / or the temperature value is greater than a preset value, the fire extinguishing driving circuit outputs a fire extinguishing trigger signal; the fire extinguishing driving circuit is connected to a fire extinguishing unit, and can start the fire extinguishing unit after receiving the fire extinguishing trigger signal. The problem that the existing smoke alarm system cannot extinguish fires in time is solved, and the purpose of controlling the fire extinguishing unit to extinguish fires as soon as a fire is discovered is achieved.

[0035] Details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objectives, and advantages of the present invention more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0037] Figure 1 This is a structural block diagram of a smoke fire extinguishing system according to an embodiment of the utility model;

[0038] Figure 2 This is a structural block diagram of a fire extinguishing control circuit board according to an embodiment of the utility model;

[0039] Figure 3 It is a pin schematic diagram of a microcontroller according to an embodiment of the utility model;

[0040] Figure 4 It is a circuit schematic diagram of the first power supply unit and the second power supply unit of an embodiment of the utility model;

[0041] FIG5( a ) is a circuit schematic diagram of a DCDC conversion circuit according to an embodiment of the present utility model;

[0042] FIG5( b ) is a circuit schematic diagram of a voltage detection circuit according to an embodiment of the present utility model;

[0043] Figure 6 This is a circuit schematic diagram of a fire extinguishing drive circuit according to an embodiment of the utility model;

[0044] FIG. 7( a ) is a circuit diagram of a temperature acquisition circuit according to an embodiment of the present invention;

[0045] FIG. 7( b ) is a circuit schematic diagram of a smoke collection circuit according to an embodiment of the present utility model;

[0046] Figure 8 It is a circuit schematic diagram of a microcontroller peripheral circuit of an embodiment of the utility model;

[0047] Fig. 9It is a circuit principle diagram of a communication circuit according to an embodiment of the utility model. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is described and illustrated in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. Based on the embodiments provided by the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0049] Obviously, the drawings described below are only some examples or embodiments of the utility model. For ordinary technicians in this field, the utility model can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed by the utility model, some changes in design, manufacturing or production based on the technical content disclosed by the utility model are just conventional technical means, and should not be understood as the content disclosed by the utility model is insufficient.

[0050] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present invention may be combined with other embodiments without conflict.

[0051] Unless otherwise defined, the technical terms or scientific terms involved in the present utility model shall be the common meaning understood by people with general skills in the technical field to which the present utility model belongs. The words "one", "a", "a", "the" and the like involved in the present utility model do not indicate a quantitative limitation and may indicate the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in the present utility model are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in the present utility model are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in the present utility model refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in the present utility model are only used to distinguish similar objects, and do not represent a specific ordering of objects.

[0052] Based on the problems existing in the prior art, the utility model provides a fire extinguishing control circuit board and a smoke fire extinguisher.

[0053] refer to Figure 1In the first aspect, the smoke-sensing fire extinguishing system of the embodiment of the utility model is mainly composed of a sensor, a control board (fire extinguishing control circuit board) and a fire extinguishing unit, wherein the fire extinguishing unit adopts a fire extinguishing bomb, the sensor includes a smoke sensor and a temperature sensor, and the control board mainly includes a main control (microcontroller), a dual power supply circuit, a fire extinguishing bomb control circuit (fire extinguishing drive circuit), 485 / NB module communication (communication circuit), a temperature sensor control circuit (temperature / smoke collection circuit) and other circuits. Specifically, the fire extinguishing unit is connected to the output end of the fire extinguishing drive circuit of the control board, the smoke sensor is connected to the smoke collection circuit, and the temperature sensor is connected to the temperature collection circuit; the smoke sensor is used to detect the smoke condition of the current environment and generate a smoke signal; the temperature sensor is used to detect the temperature condition of the current environment and output a temperature signal, such as the temperature value of the current environment; when the fire extinguishing control circuit board is used to receive the smoke signal and the temperature value, when the smoke signal and / or the temperature signal meet the preset state, such as the smoke signal is high level / the current environment temperature is greater than 50 degrees, the fire extinguishing control circuit board starts the fire extinguishing unit. In this embodiment, the preset state can be set by the staff as long as it complies with the judgment logic.

[0054] Specifically, the fire extinguishing system of the utility model is mainly composed of a microcontroller, a temperature sensor (such as DS18B20), a smoke sensor and a fire extinguishing unit (such as STATX fire extinguishing bomb). The temperature sensor can monitor the change of the ambient temperature in real time. Once the temperature exceeds the set value, the system will automatically start; the smoke sensor can monitor the smoke concentration in the environment. Once the smoke concentration exceeds the safe range, the system will automatically start; when the system detects abnormal temperature and / or smoke, it will immediately start the fire extinguishing bomb and release the fire extinguishing agent to extinguish the fire.

[0055] This embodiment can also be set to poll the smoke and temperature sensors in a 10ms cycle, which has a fast response speed. In a preferred embodiment, the action logic can be specified. For example, the temperature data or smoke signal can be coordinated, and the action condition can be set to smoke production and the temperature exceeds the limit value before the fire bomb is activated. The fire extinguishing system of the utility model supports different types of fire extinguishing bombs, which can accurately adapt to the characteristics of different burning materials.

[0056] The working process of the fire extinguishing system of the present invention is mainly controlled by a fire extinguishing control circuit board (hereinafter referred to as the main control board). The following content describes the main control board in detail.

[0057] In the second aspect, this embodiment provides a fire extinguishing control circuit board, referring to Figure 2, mainly including a microcontroller, a dual power supply circuit, a fire extinguishing drive circuit, a smoke collection circuit and a temperature collection circuit. Among them, the dual power supply circuit is used to supply power to the microcontroller, the fire extinguishing drive circuit, the smoke collection circuit and the temperature collection circuit; the smoke collection circuit is connected to the smoke sensor, used to collect the smoke sensing signal generated by the smoke sensor, and send the smoke sensing signal to the microcontroller; the temperature collection circuit is connected to the temperature sensor, used to collect the temperature value output by the temperature sensor, and send the temperature value to the microcontroller; when the fire extinguishing control circuit board is used to receive the smoke sensing signal and the temperature value, when the smoke sensing signal meets the preset level and / or the temperature value is greater than the preset value, the fire extinguishing drive circuit outputs a fire extinguishing trigger signal; the fire extinguishing drive circuit is connected to the fire extinguishing unit, used to start the fire extinguishing unit after receiving the fire extinguishing trigger signal.

[0058] In this embodiment, the microcontroller adopts the STM32F030C8T6 chip, and its pin distribution is as follows: Figure 3 As shown. Among them, the VDD and VDDA pins of chip U1 are connected to 3.3V power supply, and the PF0 / OSC_IN and PF1 / OSC_OUT pins are external crystal pins by default, connected to external crystal signals (OSC_IN and OSC_OUT); if the external crystal is not used on the STM32, the connection of OSC_IN and OSC_OUT uses the internal RC oscillator instead of the external crystal; the NRST pin is connected to the reset circuit to obtain the reset signal; the VSSA and VSS pins are grounded; the PA6 and PA7 pins are connected to the dual power supply circuit, and the battery power supply signal (VBAT_LI_AD) and the external power supply signal (VDDEXT_AD) are connected; the PB1 and PB2 pins are connected to the alarm unit, and the alarm signals (LED_ALLERT) are output respectively. and test signal (LED_TEST); PB10, PB11 and PB12-PB15 are connected to the signal collected by the temperature sensor (AQ1-DQ6); PA9 and PA10 pins are respectively connected to the transmitting end USART_TX and the receiving end USART_RX of the communication circuit; PA11 and PA12 pins are respectively connected to different fire extinguishing units to output fire extinguishing trigger signals (Grenade_Triggle1 / 2); PB3 pin is connected to the voltage detection circuit and connected to the detection signal (EXT_POWE_CHECK); PB4 pin is connected to the power switching unit and connected to the power supply mode switching signal (Power_Mode); PB5 pin is connected to the smoke signal (Smoke_Signal); BOOT0 pin is grounded through a resistor.

[0059] In a preferred embodiment, the dual power supply circuit includes a first power supply unit and a second power supply unit. Figure 4The first power supply unit includes an internal battery (BAT1-BAT4) and a first voltage divider module. In this embodiment, the internal battery uses 4 groups of lithium-ion batteries. The input end of the first voltage divider module is connected to the output end V12 of the internal battery, and the output end VBAT_LI_AD is connected to the microcontroller; the input end of the second power supply unit is connected to the external power interface J4, and the output end VDDEXT_AD of the second power supply unit is connected to the microcontroller.

[0060] In addition, the first power supply unit also includes an electronic switch JP9, and the first voltage-dividing module includes a first voltage-dividing resistor R30 and a second voltage-dividing resistor R31, R30 and R31 are connected in series between the internal battery output terminal V12 and the ground terminal GND, and the connection point between R30 and R31 is used as the output terminal VBAT_LI_AD of the first power supply unit, and is connected to the microcontroller U1. The second power supply unit includes a second voltage-dividing module and an interface J4, and the second voltage-dividing module is connected to an external power supply through the interface J4. The second voltage-dividing module includes a third voltage-dividing resistor R20 and a fourth voltage-dividing resistor R24, R20 and R24 are connected in series between the external power supply output terminal VDD_EXT and the ground terminal GND, and the connection point between R20 and R24 is used as the output terminal VDDEXT_AD of the first power supply unit.

[0061] The dual power supply circuit also includes a DCDC conversion circuit, which refers to Figure 5 (a), and its input end is connected to the internal battery and the external power supply VIN, and is used to perform DCDC conversion processing on the voltage output by the internal battery or the external power supply. The DCDC conversion circuit includes capacitor E1, capacitor C16, resistor R23, inductor L1, diode D3, capacitor E2 and DCDC conversion chip U*1 (a chip with model XL1509-5.0 can be used). Among them, the VIN pin of the chip is connected to the internal battery and the external power supply, capacitor E1 and capacitor C16 are connected between the VIN pin of the chip and the ground terminal, resistor R23 is connected between the ON / OFF pin of the chip and the ground terminal GND, inductor L1 is connected between the OUT pin of the chip and the +5V voltage, and diode D3 and capacitor E2 are connected in parallel between the +5V voltage and the ground terminal GND.

[0062] Referring to Figure 5(b), the dual power supply circuit also includes a voltage detection circuit, the input end of the voltage detection circuit is connected to the external power supply VDD_EXT, and the output end outputs a detection signal (EXT_POWE_CHECK) to the microcontroller. The voltage detection circuit is used to detect the voltage of the external power input and output a detection signal (EXT_POWE_CHECK) to the main control module, so that the microcontroller determines whether to adjust the working mode of the dual power supply circuit according to the detected signal (EXT_POWE_CHECK). The voltage detection circuit of this embodiment mainly detects the external power supply, and can also perform voltage detection on the internal battery according to the needs of the user, and analyzes the working status through the level of the detection signal (EXT_POWE_CHECK) to determine whether to enter the low power consumption mode.

[0063] As shown in Fig. 5(b), the voltage detection circuit of this embodiment includes a first diode D4, a first resistor R25, a second resistor R27 and a first transistor Q5. The anode of the first diode D4 is connected to the external power supply VDD_EXT, the cathode of the first diode D4 is connected to the first end of the first resistor R25, the second end of the first resistor R25 is coupled to the first end of the second resistor R27 and the base of the first transistor Q5, the second end of the second resistor R27 and the emitter of the first transistor Q5 are grounded, and the emitter of the first transistor Q5 is connected to the microcontroller U1 as the output end of the voltage detection circuit.

[0064] In one embodiment, reference Figure 6 The fire extinguishing driving circuit of this embodiment includes a second resistor R5 / R12, a second transistor Q2 / Q4, a third resistor R2 / R11 and a MOS transistor Q1 / Q3. The first end of the second resistor is connected to the microcontroller U1, the second end is connected to the base of the second transistor, the emitter of the second transistor is grounded, the collector of the second transistor is connected to the first end of the third resistor and the gate of the MOS transistor, the second end of the third resistor and the drain of the MOS transistor are connected to the dual power supply circuit, and the source of the MOS transistor is connected to the fire extinguishing unit J1 / J2. In addition, the fire extinguishing driving circuit also includes a resistor R7 / R14, which is connected between the second end of the second resistor and the ground terminal GND.

[0065] In one embodiment of the utility model, the temperature acquisition circuit and the smoke acquisition circuit are shown in Figure 7 (a) and Figure 7 (b). Figure 7 (a) shows the temperature acquisition circuit. Each temperature acquisition circuit of this embodiment includes a first sampling resistor R1 and a first sampling capacitor C1. The first sampling resistor and the first sampling capacitor are connected to the temperature sensor through a three-terminal interface JP1. The first end of the three-terminal interface is connected to a 3.3V power supply, the second end is connected to the 3.3V power supply through the first sampling resistor, and the third end is grounded GND. The second end outputs a temperature signal or a temperature value (i.e., DQ1) to the microcontroller U1. In this embodiment, the temperature sensors are distributedly placed to monitor the complete temperature of the space, and the temperature sensors return digital quantities to the microcontroller for temperature judgment.

[0066] The smoke sensing collection circuit includes a third sampling resistor R16 and is connected to the smoke sensor through a 4-terminal interface JP8, wherein the first end of the four-terminal interface is connected to the internal battery and the external power supply, the second end is connected to the 3.3V power supply through the third sampling resistor R16, the third end is connected to the microcontroller, and the fourth end is grounded GND, wherein the third end outputs a smoke sensing signal (Smoke_Signal) to the microcontroller, and the smoke sensor returns a switch quantity to supply the microcontroller for smoke judgment.

[0067] In a preferred embodiment, the fire extinguishing control circuit board of this embodiment also includes a plurality of peripheral circuits, such as: a power switching unit, an alarm unit, a clock unit and a reset unit, and the power switching unit and the alarm unit are respectively connected to the microcontroller. Among them, the power switching unit is used to output a power supply mode switching signal to the microcontroller, and the microcontroller adjusts the working mode of the dual power supply circuit after receiving the power supply mode switching signal, and the working mode includes a high power consumption power supply mode and a low power consumption power supply mode; the microcontroller is also used to send a warning signal to the alarm unit when the smoke sensing signal meets the preset level and / or the temperature value is greater than the preset value; the alarm unit is used to receive the warning signal and emit a warning sound or warning light according to the warning signal. The reset unit is used to output a reset signal to the microcontroller, and the microcontroller resets the fire extinguishing system after receiving the reset signal; the clock unit includes an external crystal oscillator, and the external crystal oscillator provides a clock signal to the microcontroller.

[0068] refer to Figure 8 The clock unit includes a capacitor C1, a capacitor C3 and a crystal oscillator X1, wherein the capacitors C1 and C3 are connected in parallel between the ground terminal GND and the crystal oscillator X1, and the two ends of the crystal oscillator are connected to different pins OSC_IN and OSC_OUT of the microcontroller. The reset unit includes a resistor R9 and a capacitor C5, R9 and C5 are connected in series between a 3.3V power supply and the ground terminal GND, and the series connection point of R9 and C5 is connected to the microcontroller as the output terminal NRST of the reset unit.

[0069] refer to Figure 8 The power switching unit includes a fourth resistor R3, a fifth resistor R4 and an electronic switch JP2. The first end of the electronic switch JP2 is grounded GND, the second end of the electronic switch JP2 is connected to the first end of the fourth resistor R3 and the first end of the fifth resistor R4, the second end of the fourth resistor R3 is connected to a 3.3V power supply, and the second end of the fifth resistor R4 is used as an output end Power_Mode of the power switching unit and is connected to the microcontroller.

[0070] like Figure 8 As shown, the alarm unit includes a sixth resistor R17 and a first light emitting diode LED1, wherein the sixth resistor R17 is connected between the anode of the first light emitting diode LED1 and the microcontroller, and the cathode of the first light emitting diode LED1 is grounded; when the alarm unit receives the warning signal, the first light emitting diode LED1 emits light. In addition, in a preferred embodiment, the alarm unit also includes a seventh resistor R19 and a second light emitting diode LED2, wherein the seventh resistor R19 is connected between the anode of the second light emitting diode LED2 and the microcontroller, and the cathode of the second light emitting diode LED2 is grounded; when the alarm unit receives the test signal, the second light emitting diode LED2 emits light.

[0071] refer to Fig. 9 The fire extinguishing control circuit board also includes a communication circuit, which is used to realize data transmission between the external device and the microcontroller. The communication circuit of this embodiment can use a transceiver of model SP3072EEN-L, the R and D pins of the chip are connected to the microcontroller, and the B and A pins are connected to the external 485 communication device. The 485 communication circuit of this embodiment adopts automatic transceiver control, can communicate with the external 485 device, can set the device ID, and can also be used to transmit device information, such as timed uploading of temperature information, smoke information, battery power, etc.

[0072] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A fire extinguishing control circuit board, characterized in that: It includes a microcontroller, a dual power supply circuit, a fire extinguishing drive circuit, a smoke collection circuit and a temperature collection circuit; wherein, The dual power supply circuit is used to supply power to the microcontroller, the fire extinguishing drive circuit, the smoke collection circuit and the temperature collection circuit; The smoke collection circuit is connected to the smoke sensor, and is used to collect the smoke sensing signal generated by the smoke sensor, and send the smoke sensing signal to the microcontroller; The temperature acquisition circuit is connected to the temperature sensor, and is used to acquire the temperature signal output by the temperature sensor, and send the temperature signal to the microcontroller; The microcontroller is used to receive the smoke sensing signal and the temperature signal, and when the smoke sensing signal and / or the temperature signal meets the preset state, output a fire extinguishing trigger signal to the fire extinguishing driving circuit; The fire extinguishing driving circuit is connected to the fire extinguishing unit and is used to start the fire extinguishing unit after receiving a fire extinguishing trigger signal.

2. The fire extinguishing control circuit board according to claim 1, characterized in that: The fire extinguishing control circuit board also includes a power switching unit and an alarm unit, and the power switching unit and the alarm unit are connected to the microcontroller respectively, wherein: The power switching unit is used to output a power mode switching signal to the microcontroller, and the microcontroller adjusts the working mode of the dual power supply circuit after receiving the power mode switching signal, and the working mode includes a high power consumption power supply mode and a low power consumption power supply mode; The microcontroller is also used to send a warning signal to the alarm unit when the smoke signal and / or the temperature signal meets a preset state; The alarm unit is used to receive the warning signal and emit a warning sound or a warning light according to the warning signal.

3. The fire extinguishing control circuit board according to claim 1, characterized in that: The dual power supply circuit includes a first power supply unit and a second power supply unit; wherein, The first power supply unit comprises an internal battery and a first voltage divider module, wherein the input end of the first voltage divider module is connected to the internal battery, and the output end is connected to the microcontroller; An input end of the second power supply unit is connected to an external power supply, and an output end of the second power supply unit is connected to the microcontroller.

4. The fire extinguishing control circuit board according to claim 3, characterized in that: The dual power supply circuit also includes a voltage detection circuit, the input end of the voltage detection circuit is connected to the external power supply, and the output end is connected to the microcontroller; The voltage detection circuit is used to detect the voltage of the external power supply input and output a detection signal to the main control module, so that the microcontroller determines whether to adjust the working mode of the dual power supply circuit according to the detection signal.

5. The fire extinguishing control circuit board according to claim 4, characterized in that: The voltage detection circuit includes a first diode, a first resistor, a second resistor and a first transistor; Among them, the anode of the first diode is connected to the external power supply, the cathode of the first diode is connected to the first end of the first resistor, the second end of the first resistor is coupled with the first end of the second resistor and the base of the first transistor, the second end of the second resistor and the emitter of the first transistor are grounded, and the emitter of the first transistor is connected to the microcontroller.

6. The fire extinguishing control circuit board according to claim 1, characterized in that: The fire extinguishing driving circuit includes a second resistor, a second triode, a third resistor and a MOS tube; wherein, The first end of the second resistor is connected to the microcontroller, the second end is connected to the base of the second transistor, the emitter of the second transistor is grounded, the collector of the second transistor is connected to the first end of the third resistor and the gate of the MOS tube, the second end of the third resistor and the drain of the MOS tube are connected to the dual power supply circuit, and the source of the MOS tube is connected to the fire extinguishing unit.

7. The fire extinguishing control circuit board according to claim 1, characterized in that: The fire extinguishing control circuit board also includes a communication circuit, and the communication circuit is used to realize data transmission between an external device and the microcontroller.

8. The fire extinguishing control circuit board according to claim 2, characterized in that: The power switching unit includes a fourth resistor, a fifth resistor and an electronic switch; wherein, The first end of the electronic switch is grounded, the second end of the electronic switch is connected to the first end of the fourth resistor and the first end of the fifth resistor, the second end of the fourth resistor is connected to a power supply, and the second end of the fifth resistor is connected to the microcontroller.

9. The fire extinguishing control circuit board according to claim 2, characterized in that: The alarm unit includes a sixth resistor and a first light emitting diode, wherein: The sixth resistor is connected between the anode of the first light emitting diode and the microcontroller, and the cathode of the first light emitting diode is grounded; When the alarm unit receives the warning signal, the first light emitting diode emits light.

10. A smoke fire extinguishing system, characterized in that: It comprises a fire extinguishing unit, a smoke sensor, a temperature sensor and the fire extinguishing control circuit board according to any one of claims 1 to 9; the fire extinguishing unit is connected to the output end of the fire extinguishing drive circuit, the smoke sensor is connected to the smoke collection circuit, and the temperature sensor is connected to the temperature collection circuit; The smoke sensor is used to detect the smoke condition in the current environment and generate a smoke sensing signal; the temperature sensor is used to detect the temperature condition in the current environment and output a temperature value; The fire extinguishing control circuit board is used to receive the smoke sensing signal and the temperature value. When the smoke sensing signal and / or the temperature signal meets a preset state, the fire extinguishing control circuit board starts the fire extinguishing unit.

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