CN210039027U - Composite sampling circuit and composite detector - Google Patents
Composite sampling circuit and composite detector Download PDFInfo
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- CN210039027U CN210039027U CN201920717017.7U CN201920717017U CN210039027U CN 210039027 U CN210039027 U CN 210039027U CN 201920717017 U CN201920717017 U CN 201920717017U CN 210039027 U CN210039027 U CN 210039027U
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Abstract
The application relates to a composite sampling circuit and a composite detector, which comprise a smoke acquisition module, a signal processing module and a signal processing module, wherein the smoke acquisition module is used for acquiring smoke signals; the temperature acquisition module is used for acquiring temperature signals; the amplifying module is respectively connected with the smoke acquisition module and the temperature acquisition module and is used for receiving the smoke signals and the temperature signals and amplifying the smoke signals and the temperature signals to obtain sampling signals; and the control module is connected with the amplification module and used for receiving the sampling signal and monitoring the smoke concentration and the temperature of the current environment according to the sampling signal. The smoke acquisition module and the temperature acquisition module are combined, and the same amplification module is adopted to amplify smoke signals and temperature signals to obtain sampling signals, so that the hardware cost of a sampling circuit can be reduced, and the power consumption of equipment is reduced.
Description
Technical Field
The application relates to the technical field of fire detection, in particular to a composite sampling circuit and a composite detector.
Background
The traditional fire detector mainly comprises two independent temperature-sensing fire detectors and two independent photoelectric smoke-sensing fire detectors, and whether a fire disaster happens or not is judged by detecting the change of the environmental temperature and the change of the concentration of smoke particles respectively. As the temperature rise of a fire needs a longer process, the independent temperature-sensing fire detector cannot perform early warning at the initial stage of the fire; and the independent photoelectric smoke fire detector is easy to generate false alarm under the environment with larger dust, water mist and oil smoke. Therefore, at present, a smoke-temperature composite fire detector is generally adopted, two fire characteristic parameters of temperature and smoke particles are monitored simultaneously, and the reliability of fire detection is improved.
However, the currently adopted smoke-temperature composite fire detector usually increases the volume of the equipment and the power consumption of the whole machine by adding a smoke collection module and a temperature collection module and then respectively adopting different processing circuits to process smoke and temperature.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a composite sampling circuit and a composite detector, which can reduce the volume of equipment and the power consumption of the whole machine.
A complex sampling circuit, comprising: the smoke acquisition module is used for acquiring smoke signals; the temperature acquisition module is used for acquiring temperature signals; the amplifying module is respectively connected with the smoke acquisition module and the temperature acquisition module and is used for receiving the smoke signals and the temperature signals and amplifying the smoke signals and the temperature signals to obtain sampling signals; and the control module is connected with the amplification module and used for receiving the sampling signal and monitoring the smoke concentration and the temperature of the current environment according to the sampling signal.
In one embodiment, the amplifying module comprises an operational amplifier and a first resistor, wherein the operational amplifier comprises a non-inverting input terminal, an inverting input terminal and an output terminal; the smog collection module includes first output and second output, wherein, the in-phase input respectively with smog collection module the first output with temperature acquisition module connects, the inverting input with smog collection module the second output is connected, the output with control module connects, the output still passes through first resistance with the inverting input is connected, it is right that the module that enlargies simultaneously smog signal with temperature signal is in order to acquire sampling signal.
In one embodiment, the smoke collection module comprises an infrared emission unit and an infrared receiving unit, and smoke signals are collected between the infrared emission unit and the infrared receiving unit through photoelectric induction.
In one embodiment, the infrared emission unit includes: the anode of the infrared emission tube is connected with the power supply through the second resistor, and the cathode of the infrared emission tube is grounded.
In one embodiment, the composite sampling circuit further comprises a first switch control tube, and the cathode of the infrared emission tube is grounded through the first switch control tube; the first switch control tube further comprises a first enabling end, the first switch control tube is connected with the control module through the first enabling end, and the control module periodically outputs high level to the first switch control tube through the first enabling end so that the first switch control tube is in an open state.
In an embodiment, the temperature acquisition module includes a temperature sensing unit and a third resistor, one end of the temperature sensing unit is connected to the power supply, the other end of the temperature sensing unit is connected to the non-inverting input terminal, one end of the third resistor is connected to the non-inverting input terminal, and the other end of the third resistor is grounded.
In an embodiment, the composite sampling circuit further includes a second switch control tube, and the temperature sensing unit is connected to the power supply through the second switch control tube; the second switch control tube further comprises a second enabling end, the second switch control tube is connected with the control module through the second enabling end, and the control module periodically outputs high level to the second switch control tube through the second enabling end so that the second switch control tube is in an open state.
In an embodiment, the composite sampling circuit further includes a fourth resistor, one end of the fourth resistor is connected to the third resistor, and the other end of the fourth resistor is connected to the first output end of the smoke collection module.
In one embodiment, the temperature sensing unit is an NTC thermistor.
In addition, a composite detector is also provided, and the composite detector comprises the composite sampling circuit.
The composite sampling circuit and the composite detector comprise a smoke acquisition module for acquiring smoke signals; the temperature acquisition module is used for acquiring temperature signals; the amplifying module is respectively connected with the smoke acquisition module and the temperature acquisition module and is used for receiving the smoke signals and the temperature signals and amplifying the smoke signals and the temperature signals to obtain sampling signals; and the control module is connected with the amplification module and used for receiving the sampling signal and monitoring the smoke concentration and the temperature of the current environment according to the sampling signal. The smoke acquisition module and the temperature acquisition module are combined, and the same amplification module is adopted to amplify smoke signals and temperature signals to obtain sampling signals, so that the hardware cost of a sampling circuit can be reduced, and the power consumption of equipment is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a complex sampling circuit according to an embodiment;
FIG. 2 is a schematic diagram of a composite sampling circuit according to another embodiment;
fig. 3 is a schematic structural diagram of a complex sampling circuit in yet another embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
Fig. 1 is a schematic diagram of a complex sampling circuit 100 provided in one embodiment. As shown in figure 1 of the drawings, in which,
a complex sampling circuit 100, comprising: a smoke collection module 101, a temperature collection module 102, an amplification module 103, and a control module 104. Wherein,
the smoke acquisition module 101 is used for acquiring smoke signals;
the temperature acquisition module 102 is used for acquiring temperature signals;
the smoke collection module 101 may include a smoke sensor for collecting smoke signals, for example, collecting smoke concentration information of the current environment; the temperature acquisition module 102 may include a temperature sensor for acquiring a temperature signal, which may be for acquiring a temperature level of a current environment.
And the amplifying module 103 is connected with the smoke acquisition module 101 and the temperature acquisition module 102 respectively, and is used for receiving the smoke signal and the temperature signal, and amplifying the smoke signal and the temperature signal to obtain a sampling signal.
And the control module 104 is connected with the amplification module 103 and is used for receiving the sampling signal and monitoring the smoke concentration and the temperature of the current environment according to the sampling signal.
The input end of the amplifying module 103 is connected to the output ends of the smoke collecting module 101 and the temperature collecting module 102, respectively, and is configured to receive the smoke signal and the temperature signal, and amplify the received smoke signal and temperature signal to obtain a sampling signal. The output end of the amplifying module 103 is connected with the control module 104. The control module 104 may include only one input pin, and the input pin is connected to the output terminal of the amplifying module 103, and is used for receiving the sampling signal and monitoring the smoke concentration and the temperature of the current environment according to the sampling signal.
It should be noted that the control module 104 may be a controller, a processing chip, and the like, and the specific structure of the embodiment is not limited, and may be selected according to actual situations.
The complex sampling circuit 100 includes a smoke collection module 101 for collecting smoke signals; the temperature acquisition module 102 is used for acquiring temperature signals; the amplifying module 103 is respectively connected with the smoke acquisition module 101 and the temperature acquisition module 102, and is used for receiving the smoke signal and the temperature signal, and amplifying the smoke signal and the temperature signal to obtain a sampling signal; and the control module 104 is connected with the amplification module 103 and is used for receiving the sampling signal and monitoring the smoke concentration and the temperature of the current environment according to the sampling signal. The smoke acquisition module 101 and the temperature acquisition module 102 are combined, and the same amplification module 103 is adopted to amplify the smoke signals and the temperature signals to obtain sampling signals, so that the hardware cost of a sampling circuit can be reduced, and the power consumption of equipment can be reduced.
In an embodiment, the complex sampling circuit 100 further includes an analog-to-digital conversion unit, which is respectively connected to the output terminal of the amplifying module 103 and the control module 104, and is configured to receive the sampling signal, convert the sampling signal into a digital signal, and output the digital signal to the control module 104. The analog-to-digital conversion unit may be provided integrally with the control module 104 or may be provided separately.
Fig. 2 is a schematic structural diagram of a circuit of the complex sampling circuit 100 provided in yet another embodiment. As shown in fig. 2, the amplifying module 103 includes an operational amplifier a and a first resistor R1, wherein the operational amplifier a includes a non-inverting input terminal, an inverting input terminal and an output terminal; the smoke collection module 101 comprises a first output end and a second output end, wherein the in-phase input end is connected with the first output end of the smoke collection module 101 and the temperature collection module 102 respectively, the reverse phase input end is connected with the second output end of the smoke collection module 101, the output end is connected with the control module 104, the output end is further connected with the reverse phase input end through a first resistor R1, and the amplification module 103 is used for simultaneously amplifying smoke signals and temperature signals to obtain sampling signals.
The non-inverting input end of the operational amplifier a is connected with the first output end of the smoke collection module 101 and the temperature collection module 102 respectively, so that the temperature collection module 102 and the smoke collection module 101 can be combined together to form the composite sampling circuit 100, and smoke signals and temperature signals are collected simultaneously.
In an embodiment, the temperature collecting module 102 includes a temperature sensing unit T and a third resistor R3, one end of the temperature sensing unit T is connected to the power supply, the other end of the temperature sensing unit T is connected to the non-inverting input terminal of the operational amplifier a, one end of the third resistor R3 is connected to the non-inverting input terminal of the operational amplifier a, and the other end of the third resistor R3 is grounded. In one embodiment, the temperature sensing unit T may be an NTC thermistor RT. The NTC thermistor RT is a negative temperature coefficient resistor, and its resistance value decreases accordingly when the temperature increases, so that the resistance value of the NTC thermistor RT can reflect the current environmental temperature change.
The temperature acquisition module 102 can be understood as a voltage dividing circuit, that is, the NTC thermistor RT and the third resistor R3 are both voltage dividing resistors, and the voltage divided by the third resistor R3 is used to add a dc bias voltage to the non-inverting input terminal of the operational amplifier a. When the power supply voltage is VCC, the voltage U1 across the third resistor R3 becomes VCC (R3/(RT + R3)), which corresponds to an increase of a dc bias voltage of U1 to the non-inverting input terminal of the operational amplifier a. Since the operational amplifier a cannot perform absolute rail-to-rail input, when the input signal of the operational amplifier a is too small, the input signal cannot be amplified, so that when the voltage value of the sampling signal is small, the sampling signal cannot be amplified, and the control module 104 cannot accurately analyze the sampling signal to monitor the smoke concentration and the temperature of the current environment. In this embodiment, the temperature acquisition module 102 is connected to the first output end of the smoke acquisition module 101, so that on one hand, the voltage value at the input end of the operational amplifier a can be raised, and thus it is ensured that the operational amplifier a can amplify an input signal, and the voltage value output by the operational amplifier a is correspondingly raised, and thus the control module 104 can perform more accurate analysis according to the raised signal, so as to more accurately monitor the smoke concentration and temperature of the current environment; on the other hand, connecting the first output end of the temperature acquisition module 102 and the smoke acquisition module 101 can effectively combine the temperature acquisition module 102 and the smoke acquisition module 101 to jointly acquire smoke signals and temperature signals of the current environment, thereby reducing one single temperature sampling circuit, reducing hardware cost, reducing the overall power consumption of the composite sampling circuit 100 and reducing the size of a single board.
In an embodiment, the smoke collection module 101 includes an infrared emitting unit and an infrared receiving unit, and the smoke signal is collected between the infrared emitting unit and the infrared receiving unit through photoelectric sensing. Wherein, the infrared emission unit may include: the infrared emission tube M1 and the second resistance R2, the positive pole of infrared emission tube M1 passes through second resistance R2 and is connected with the power, and the negative pole ground connection of infrared emission tube M1. Accordingly, the infrared receiving unit may include an infrared receiving tube M2.
The smoke collection module 101 collects smoke signals of the current environment, and the principle is to use the light refraction principle. Typically, both the infrared transmitting tube M1 and the infrared receiving tube M2 are disposed within the maze. Normally, the infrared receiving tube M2 in the maze can only receive a small amount of infrared light or cannot receive the infrared light emitted from the infrared emitting tube M1; when smoke enters the labyrinth, infrared light is refracted and diffracted in multiple directions, so that the infrared light received by the infrared receiving tube is changed greatly, and the generated current is increased. The more smoke particles enter the labyrinth, the more infrared light is received by the infrared receiving tube M2, and the larger the current is generated. Therefore, the current generated by the infrared receiving tube can reflect the smoke concentration of the current environment.
In this embodiment, the infrared receiving tube M2 is an infrared triode, and two output ends of the infrared triode are the first output end and the second output end of the smoke collection module 101. Assuming that the current generated by the infrared receiving tube M2 is I and the power supply voltage is VCC, the currents output by the first output terminal and the second output terminal of the smoke collection module 101 are both I. The voltage of the third resistor R3, which is also the voltage U1 at the output terminal of the temperature acquisition module 102 at VCC (R3/(RT + R3)), is U1 at the non-inverting input terminal of the operational amplifier a, and is also U1 at the inverting input terminal of the operational amplifier a according to the virtual short concept of the operational amplifier a. Since the output terminal of the operational amplifier a is further connected to the inverting input terminal through the first resistor R1, the output voltage of the operational amplifier a is U2-U1 + I R1, and the effective voltage value output by the operational amplifier a is U2-U1-I R1. By collecting U1 and U2 and analyzing the difference between U1 and U2, the change of smoke concentration and temperature in the current environment can be intuitively understood.
In an embodiment, the complex sampling circuit 100 further includes a fourth resistor R4, one end of the fourth resistor R4 is connected to the third resistor R3, and the other end of the fourth resistor R4 is connected to the first output terminal of the smoke collection module 101. At this time, if the current generated by the infrared receiving tube is I, the currents output by the first output end and the second output end of the smoke collection module 101 are both I. The voltage of the third resistor R3 is U1 ═ VCC (R3/(RT + R3)), so the voltage at the non-inverting input terminal of the operational amplifier a is U1+ I × R4, and the voltage at the inverting input terminal of the operational amplifier a is also U1+ I × R4 according to the virtual short concept of the operational amplifier a. Since the output terminal of the operational amplifier a is further connected to the inverting input terminal through the first resistor R1, the output voltage of the operational amplifier a is U2 ═ U1+ I (R1+ R4), and the effective voltage value output by the operational amplifier a is U2 — U1 ═ I (R1+ R4). By collecting U1 and U2 and analyzing the difference between U1 and U2, the change of smoke concentration and temperature in the current environment can be intuitively understood. In this embodiment, the input voltage of the operational amplifier a can be further increased by setting the fourth resistor R4, so that it is ensured that the operational amplifier a can amplify the input signal, so that the voltage value output by the operational amplifier a is also correspondingly increased, and the control module 104 can perform more accurate analysis according to the increased signal, so as to more accurately monitor the smoke concentration and the temperature of the current environment.
Fig. 3 is a schematic structural diagram of a circuit of the complex sampling circuit 100 provided in yet another embodiment. As shown in fig. 2, the complex sampling circuit 100 further includes a first switching control transistor Q1 and a second switching control transistor Q2, wherein,
the cathode of the infrared emission tube M1 is grounded through a first switch control tube Q1; the first switch control tube Q1 further includes a first enable terminal EN1, the first switch control tube Q1 is connected to the control module 104 through the first enable terminal EN1, and the control module 104 periodically outputs a high level to the first switch control tube Q1 through the first enable terminal EN1, so that the first switch control tube Q1 is in an on state.
The temperature sensing unit T is connected with a power supply through a second switch control tube Q2; the second switch control tube Q2 further includes a second enable terminal EN2, the second switch control tube Q2 is connected to the control module 104 through the second enable terminal EN2, and the control module 104 periodically outputs a high level to the second switch control tube Q2 through the second enable terminal EN2, so that the second switch control tube Q2 is in an on state.
The first switch control tube Q1 can be a triode, the base of the triode is connected with the control module 104 through the first enable end EN1 for receiving the level signal output by the control module 104, when receiving the high level signal, the first switch control tube Q1 is conducted, the infrared emission unit 1011 is in a working state, and therefore the smoke signal can be collected.
The second switch control tube Q2 may be a triode, the base of which is connected with the control module 104 through the second enable terminal EN2 for receiving the level signal output by the control module 104, and when receiving the high level signal, the second switch control tube Q2 is turned on, so as to collect the temperature signal.
The first switching control tube Q1 and the second switching control tube Q2 may be other switching circuits or switching components, such as an enable circuit and a thyristor, which are described above by way of example only and are not intended to limit the specific configurations of the first switching control tube Q1 and the second switching control tube Q2.
The control module 104 periodically outputs a high level to the first switch control transistor Q1 and the second switch control transistor Q2 to make the first switch control transistor Q1 and the second switch control transistor Q2 periodically in an operating state, so that the complex sampling circuit 100 can periodically operate, and the power consumption of the complex sampling circuit 100 is reduced.
In an embodiment, the apparatus further includes a filtering unit (not shown in the figure), one end of the filtering unit is connected to the first input terminal and the second input terminal of the operational amplifier a, respectively, and the other end of the filtering unit is grounded, and is used for filtering some interference signals in the smoke signal and the temperature signal. The filtering unit is a filtering circuit, a filter, a capacitor and other devices with a filtering function, and the specific device of the filtering unit is not limited in this embodiment and can be selected according to actual situations.
The embodiment of the application also provides a composite detector, which comprises the composite sampling circuit 100, wherein the composite sampling circuit comprises a smoke acquisition module 101 for acquiring smoke signals; the temperature acquisition module 102 is used for acquiring temperature signals; the amplifying module 103 is respectively connected with the smoke acquisition module 101 and the temperature acquisition module 102, and is used for receiving the smoke signal and the temperature signal, and amplifying the smoke signal and the temperature signal to obtain a sampling signal; and the control module 104 is connected with the amplification module 103 and is used for receiving the sampling signal and monitoring the smoke concentration and the temperature of the current environment according to the sampling signal. The smoke acquisition module 101 and the temperature acquisition module 102 are combined, and the same amplification module 103 is adopted to amplify the smoke signals and the temperature signals to obtain sampling signals, so that the hardware cost of a sampling circuit can be reduced, and the power consumption of equipment can be reduced.
In one embodiment, the composite detector further comprises an alarm circuit connected to the composite sampling circuit 100, and the alarm circuit is configured to activate an alarm signal when the composite sampling circuit 100 detects that the smoke concentration and the temperature of the current environment are higher than predetermined values.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A complex sampling circuit, comprising:
the smoke acquisition module is used for acquiring smoke signals;
the temperature acquisition module is used for acquiring temperature signals;
the amplifying module is respectively connected with the smoke acquisition module and the temperature acquisition module and is used for receiving the smoke signals and the temperature signals and amplifying the smoke signals and the temperature signals to obtain sampling signals;
and the control module is connected with the amplification module and used for receiving the sampling signal and monitoring the smoke concentration and the temperature of the current environment according to the sampling signal.
2. The complex sampling circuit of claim 1, wherein the amplification module comprises an operational amplifier and a first resistor, the operational amplifier comprising a non-inverting input, an inverting input, and an output; the smog collection module includes first output and second output, wherein, the in-phase input respectively with smog collection module the first output with temperature acquisition module connects, the inverting input with smog collection module the second output is connected, the output with control module connects, the output still passes through first resistance with the inverting input is connected, it is right that the module that enlargies simultaneously smog signal with temperature signal is in order to acquire sampling signal.
3. The composite sampling circuit of claim 1, wherein the smoke collection module comprises an infrared emission unit and an infrared receiving unit, and smoke signals are collected between the infrared emission unit and the infrared receiving unit through photoelectric induction.
4. The composite sampling circuit of claim 3, wherein the infrared emission unit comprises an infrared emission tube and a second resistor, wherein an anode of the infrared emission tube is connected to a power supply through the second resistor, and a cathode of the infrared emission tube is grounded.
5. The composite sampling circuit of claim 4, further comprising a first switch control tube, wherein the cathode of the infrared emission tube is grounded through the first switch control tube; the first switch control tube further comprises a first enabling end, the first switch control tube is connected with the control module through the first enabling end, and the control module periodically outputs high level to the first switch control tube through the first enabling end so that the first switch control tube is in an open state.
6. The composite sampling circuit according to claim 2, wherein the temperature acquisition module comprises a temperature sensing unit and a third resistor, one end of the temperature sensing unit is connected to the power supply, the other end of the temperature sensing unit is connected to the non-inverting input terminal, one end of the third resistor is connected to the non-inverting input terminal, and the other end of the third resistor is grounded.
7. The composite sampling circuit of claim 6, further comprising a second switch control tube, wherein the temperature sensing unit is connected to a power supply through the second switch control tube; the second switch control tube further comprises a second enabling end, the second switch control tube is connected with the control module through the second enabling end, and the control module periodically outputs high level to the second switch control tube through the second enabling end so that the second switch control tube is in an open state.
8. The complex sampling circuit of claim 6, further comprising a fourth resistor, one end of the fourth resistor being connected to the third resistor, the other end of the fourth resistor being connected to the first output of the smoke collection module.
9. The composite sampling circuit of claim 6, wherein the temperature sensing unit is an NTC thermistor.
10. A composite detector comprising a composite sampling circuit as claimed in claims 1 to 9.
Priority Applications (1)
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|---|---|---|---|
| CN201920717017.7U CN210039027U (en) | 2019-05-17 | 2019-05-17 | Composite sampling circuit and composite detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920717017.7U CN210039027U (en) | 2019-05-17 | 2019-05-17 | Composite sampling circuit and composite detector |
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| CN210039027U true CN210039027U (en) | 2020-02-07 |
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| CN201920717017.7U Active CN210039027U (en) | 2019-05-17 | 2019-05-17 | Composite sampling circuit and composite detector |
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