Air detector with positioning function

Abstract

The air detector with a positioning function disclosed in the present invention comprises a shell, a display screen, buttons and indicator lights are arranged on the shell, an air guide channel penetrating the shell is arranged on the side of the shell, a sensor group is arranged on the inner wall of the air guide channel, a circuit board is arranged in the shell, and the display screen, buttons, indicator lights and sensor group are electrically connected to the circuit board respectively; the present invention can accurately position the air detector, realize remote monitoring of staff, improve work efficiency, save manpower and material resources, and has extremely strong practicality.

Description

Technical Field

[0001] The invention belongs to the technical field of air detectors, and in particular relates to an air detector with a positioning function. Background Art

[0002] With the development of economy and the improvement of people's living standards, people pay more and more attention to the environment of daily living, activities and working places, and strive to create a more comfortable and healthy living, activity and working environment. However, with the development of industry, air pollution is becoming more and more serious. The air quality in some places has seriously declined, which is not conducive to people's health. Therefore, it is necessary to accurately measure the air quality, and then implement effective preventive measures or improvement measures based on the measurement results. At present, the existing portable air quality detectors generally have the problems of single measurement function, low detection accuracy and large measurement error. To test environmental indicators, it is often necessary to carry multiple test equipment, and the measurement of environmental indicators is not accurate enough. In addition, when testing outdoor air quality, workers need to operate outdoors for a long time, which is time-consuming and laborious. Summary of the invention

[0003] The present invention overcomes the deficiencies of the prior art and aims to solve the technical problem of providing an air detector with high measurement accuracy and a positioning function.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: an air detector with a positioning function comprises a shell, a display screen, a button and an indicator light are arranged on the shell, an air guide channel penetrating the shell is arranged on the side of the shell, a sensor group is arranged on the inner wall of the air guide channel, a circuit board is arranged in the shell, and the display screen, the button, the indicator light and the sensor group are electrically connected to the circuit board respectively;

[0005] The circuit board is provided with a signal conditioning circuit, a filtering and amplifying circuit, an AD conversion circuit, a single-chip microcomputer, a positioning circuit and a communication circuit. The input end of the signal conditioning circuit is electrically connected to the sensor group, the output end of the signal conditioning circuit is connected to the input end of the filtering and amplifying circuit, the output end of the filtering and amplifying circuit is connected to the input end of the AD conversion circuit, the output end of the AD conversion circuit is connected to the input end of the single-chip microcomputer, the positioning circuit is connected to the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is connected to the background monitoring center through the communication circuit.

[0006] Preferably, it also includes a power supply module, which includes: a solar panel, an anti-surge circuit, a charging circuit, a voltage stabilizing circuit, an overcurrent protection circuit and a battery. The solar panel is electrically connected to the battery through the anti-surge circuit, the charging circuit, the voltage stabilizing circuit, and the overcurrent protection circuit in sequence, and the battery is electrically connected to the input end of the single-chip microcomputer.

[0007] Preferably, the surge protection circuit includes capacitor C5, capacitor C6, resistor R7, resistor R8, resistor R9, resistor R10, and MOS tube Q3; the charging circuit includes transistor Q4, transistor Q5, and rectifier bridge T2; the voltage stabilizing circuit includes voltage stabilizing chip U1 and inductor L4; the overcurrent protection circuit includes transistor Q6 and transistor Q7;

[0008] One end of the capacitor C5 is respectively connected to the positive electrode of the diode D2 and the positive output end of the solar cell panel, the negative electrode of the diode D2 is respectively connected to one end of the resistor R7 and the source of the MOS tube Q3, the diode D1 is connected in parallel to the source and drain of the MOS tube Q3, the resistor R11 is connected in parallel to the two ends of the diode D1, the drain of the MOS tube Q3 is respectively connected to one end of the resistor R9, one end of the capacitor C6, one end of the capacitor C7, one end of the resistor R12, one end of the resistor R15, and one end of the coil L1 of the transformer T1, the other end of the coil L1 of the transformer T1 is respectively connected to the other end of the resistor R15 and the collector of the transistor Q5, the base of the transistor Q5 is respectively connected to the other end of the resistor R12, the resistor R1 3 and the collector of transistor Q4, the other end of resistor R13 is connected in series with capacitor C8 and then connected to one end of coil L2 of transformer T1, the other end of coil L2 of transformer T1 is respectively connected to the emitter of transistor Q5, one end of resistor R14, the emitter of transistor Q4, the other end of capacitor C7, the other end of capacitor C6, one end of resistor R10, the gate of MOS transistor Q3, one end of resistor R8, the other end of capacitor C5, and the negative output end of solar cell panel (6), the other end of resistor R8 is connected to the other end of resistor R7, the other end of resistor R10 is connected to the other end of resistor R9, and coil L3 of transformer T1 is connected in parallel to both ends of the positive input end and the negative input end of rectifier bridge T2;

[0009] The other end of the resistor R14 is respectively connected to the base of the transistor Q4 and the positive electrode of the diode D3. The negative electrode of the diode D3 is respectively connected to one end of the resistor R16 and one end of the resistor R17. The other end of the resistor R16 is respectively connected to the output positive end of the rectifier bridge T2, one end of the capacitor C9, one end of the capacitor C10, one end of the capacitor C11, one end of the inductor L4, one end of the resistor R18, and the IN end of the voltage regulator chip U1. The other end of the resistor R18 is connected to the EN end of the voltage regulator chip U1. The output negative end of the rectifier bridge T2 is respectively connected to the other end of the resistor R17, the other end of the capacitor C9, the other end of the capacitor C10, the other end of the capacitor C11, the GND end of the voltage regulator chip U1, one end of the resistor R19, one end of the capacitor C12, one end of the capacitor C13, one end of the resistor R24, and the negative input end of the battery. The SW end of the voltage regulator chip U1 is respectively connected to the other end of the inductor L4, the diode C12, the capacitor C13, the resistor R24, and the negative input end of the battery. The positive electrode of the diode D4 is connected, the negative electrode of the diode D4 is respectively connected to one end of the resistor R20, the other end of the capacitor C12, the other end of the capacitor C13, and one end of the fuse F1, the other end of the resistor R20 is respectively connected to the FB end of the voltage stabilizing chip U1 and the other end of the resistor R19, the other end of the fuse F1 is connected to the positive electrode of the diode D5, the negative electrode of the diode D5 is respectively connected to the emitter of the transistor Q6 and one end of the resistor R21, the other end of the resistor R21 is respectively connected to one end of the resistor R22 and the emitter of the transistor Q7, the collector of the transistor Q7 is respectively connected to the positive electrode of the diode D6 and one end of the resistor R23, the other end of the resistor R23 is respectively connected to the other end of the resistor R22 and the base of the transistor Q6, the negative electrode of the diode D6 is connected to the positive input end of the battery, and the other end of the resistor R24 ​​is respectively connected to the base of the transistor Q7 and the collector of the transistor Q6.

[0010] Preferably, the signal conditioning circuit includes an operational amplifier Q1, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2; the filter amplifier circuit includes an operational amplifier Q2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a sliding rheostat RT1, a capacitor C3 and a capacitor C4;

[0011] The non-inverting input terminal of the operational amplifier Q1 is connected to the first terminal of the interface U1, the second terminal of the interface U1 is grounded, the inverting input terminal and the negative pole of the power supply of the operational amplifier Q1 are grounded, the positive pole of the power supply of the operational amplifier Q1 is connected in series with the resistor R2 and then connected to the 5V power supply terminal, the connection line between the positive pole of the power supply of the operational amplifier Q1 and the resistor R2 is connected in series with the capacitor C2 and then grounded, the resistor R1 is connected in parallel to the non-inverting input terminal and the output terminal of the operational amplifier Q1, the capacitor C1 is connected in parallel to the two ends of the resistor R1, the output terminal of the operational amplifier Q1 is connected in series with the resistor R3 and the resistor R4 in sequence and then connected to the non-inverting input terminal of the operational amplifier Q2. The input end is connected, the connection between resistors R3 and R4 is connected in series with capacitor C3 and then grounded, the connection between resistors R3 and R4 is connected to the first fixed end of the sliding rheostat RT1, the second fixed end of the sliding rheostat RT1 is connected to the sliding end of the sliding rheostat RT1 and is connected to one end of capacitor C4, the output end of the operational amplifier Q2, and one end of resistor R6, the other end of capacitor C4 is connected to the non-inverting input end of the operational amplifier Q2, the inverting input end of the operational amplifier Q1 is connected in series with resistor R5 and then grounded, the other end of resistor R6 is connected to the input end of the AD conversion circuit, and the interface U1 is electrically connected to the sensor group.

[0012] Preferably, the positioning circuit includes a Beidou circuit and a base station circuit.

[0013] Preferably, the sensor group includes a formaldehyde sensor, a temperature and humidity sensor, a dust sensor, a carbon monoxide sensor and a sulfide sensor.

[0014] Preferably, the communication circuit is a WIFI module or a GPRS communication module or a 3G communication module or a CDMA communication module.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The air detector with a positioning function of the present invention comprises a shell, a display screen, buttons and indicator lights are arranged on the shell, an air guide channel penetrating the shell is arranged on the side of the shell, a sensor group is arranged on the inner wall of the air guide channel, and a circuit board is arranged in the shell; the present invention can accurately locate the air detector, realize remote monitoring of staff, improve work efficiency, save manpower and material resources, and has extremely strong practicality.

[0017] 2. The side of the shell of the present invention is provided with an air guide channel that penetrates the shell, and the air guide channel solves the problem of inaccurate inspection results caused by the influence of poor air circulation in traditional gas inspection devices; a sensor group is arranged on the inner wall of the air guide channel, and the sensor group is arranged on the inner wall of the air guide channel to avoid excessive flow rate or collision, etc., which may cause the sensor group to fall, thereby extending the service life of the sensor group.

[0018] 3. The circuit board of the present invention is provided with a signal conditioning circuit and a filtering and amplifying circuit. The signal conditioning circuit can convert the input current signal into a voltage signal, thereby improving the load capacity; the filtering and amplifying circuit can improve the signal-to-noise ratio of the circuit, effectively amplify the signal, and avoid the loss and inaccuracy of the collected data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0020] Figure 1 A schematic diagram of the structure provided in Embodiment 1 of the present invention;

[0021] Figure 2 A schematic diagram of the structure of a circuit board provided in Embodiment 1 of the present invention;

[0022] Figure 3 A schematic diagram of the structure of a power supply module provided in Embodiment 2 of the present invention;

[0023] Figure 4 A circuit structure diagram of a signal conditioning circuit and a filtering and amplifying circuit provided in Embodiment 3 of the present invention;

[0024] In the figure: 1 is a shell, 11 is a circuit board, 111 is a signal conditioning circuit, 112 is a filter amplifier circuit, 113 is an AD conversion circuit, 114 is a single-chip microcomputer, 115 is a positioning circuit, 116 is a communication circuit, 2 is a display screen, 3 is a button, 4 is an indicator light, 5 is a wind guide channel, 6 is a solar cell panel, 7 is an anti-surge circuit, 8 is a charging circuit, 9 is a voltage stabilizing circuit, 10 is an overcurrent protection circuit, and 12 is a battery. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Example 1

[0026] like Figure 1As shown, an air detector with a positioning function includes a shell 1, on which a display screen 2, a button 3 and an indicator light 4 are provided, a side of the shell 1 is provided with an air guide channel 5 that penetrates the shell, an inner wall of the air guide channel 5 is provided with a sensor group, a circuit board 11 is provided in the shell 1, and the display screen 2, button 3, indicator light 4 and sensor group are electrically connected to the circuit board 11 respectively; the sensor group includes a formaldehyde sensor, a temperature and humidity sensor, a dust sensor, a carbon monoxide sensor and a sulfide sensor.

[0027] Specifically, the signal collected by the sensor group is processed by the circuit on the circuit board 11 and sent to the background monitoring center, so that the staff can understand the air conditions around the air detector in real time. At the same time, the processed signal is displayed through the display screen 2, so that the on-site staff can understand the working situation in time; the detection standard under different conditions can be adjusted by pressing the button 3 to achieve the optimization purpose; the side of the shell 1 is provided with an air guide channel 5 that runs through the shell, which solves the problem of inaccurate inspection results caused by the influence of poor air circulation in traditional gas inspection devices; the sensor group is arranged on the inner wall of the air guide channel 5, and the sensor group is arranged on the inner wall of the air guide channel 5 to avoid excessive flow rate or collision, etc., which causes the sensor group to fall, thereby extending the service life of the sensor group.

[0028] like Figure 2 As shown, the circuit board 11 is provided with a signal conditioning circuit 111, a filter amplifier circuit 112, an AD conversion circuit 113, a single chip microcomputer 114, a positioning circuit 115 and a communication circuit 116. The input end of the signal conditioning circuit 111 is electrically connected to the sensor group, the output end of the signal conditioning circuit 111 is connected to the input end of the filter amplifier circuit 112, the output end of the filter amplifier circuit 112 is connected to the input end of the AD conversion circuit 113, the output end of the AD conversion circuit 113 is connected to the input end of the single chip microcomputer 114, the positioning circuit 115 is connected to the input end of the single chip microcomputer 114, and the output end of the single chip microcomputer 114 is connected to the background monitoring center through the communication circuit 116; the communication circuit 116 is a WIFI module or a GPRS communication module or a 3G communication module or a CDMA communication module; the above modules are small in size, low in cost, and realize high-speed data transmission; the model of the single chip microcomputer is STC89C52, and the single chip microcomputer has the characteristics of high speed, low power consumption and super strong interference.

[0029] Specifically, the sensor group outputs a current signal, which is converted into a voltage signal by the signal conditioning circuit 111, and the converted voltage signal is transmitted to the filter amplifier circuit 112. The filter amplifier circuit 112 filters out the interference signal, and amplifies the voltage signal and transmits it to the AD conversion circuit 113. The digital signal of the gas concentration to be detected is obtained by the AD conversion circuit 113. The AD conversion circuit 113 sends the converted digital signal to the single-chip microcomputer 114, and at the same time locates the position of the air detector through the positioning circuit 115, and sends the position information to the single-chip microcomputer 114. The single-chip microcomputer sends the collected sensor group signal and the position information of the air detector to the background monitoring center through the communication circuit 116, so as to realize remote monitoring of the staff, improve work efficiency, save manpower and material resources, and has extremely strong practicality.

[0030] When in use, the sensor group collects air in real time, and the air signal is processed by the signal conditioning circuit 111, the filter amplifier circuit 112, and the AD conversion circuit 113 and sent to the single-chip computer 114, and transmitted to the background monitoring center through the communication circuit 116, and the position of the air detector is located by the positioning circuit 115, so that the staff in the background monitoring center can centrally monitor multiple air detectors. Example 2

[0031] like Figure 3 As shown, the air detector also includes a power supply module, which includes a solar panel 6, an anti-surge circuit 7, a charging circuit 8, a voltage stabilizing circuit 9, an overcurrent protection circuit 10 and a battery 12. The solar panel 6 is electrically connected to the battery 12 through the anti-surge circuit 7, the charging circuit 8, the voltage stabilizing circuit 9, and the overcurrent protection circuit 10 in sequence. The battery 12 is electrically connected to the input end of the single-chip computer 114 to power the air detector.

[0032] The surge protection circuit 7 includes capacitor C5, capacitor C6, resistor R7, resistor R8, resistor R9, resistor R10, and MOS tube Q3; the charging circuit 8 includes transistor Q4, transistor Q5, and rectifier bridge T2; the voltage stabilizing circuit 9 includes a voltage stabilizing chip U1 and an inductor L4; the overcurrent protection circuit 10 includes transistor Q6 and transistor Q7; the model of the voltage stabilizing chip U1 is XL6009, and the voltage stabilizing chip U1 can convert a lower DC voltage into a boosted DC power supply that outputs a higher voltage and allows a larger current output, so that the power supply module develops in the aspects of low power consumption, stable output voltage, small size, light weight, high conversion efficiency, energy saving, etc., and has certain practicality.

[0033] One end of the capacitor C5 is respectively connected to the positive electrode of the diode D2 and the positive output end of the solar cell panel 6, the negative electrode of the diode D2 is respectively connected to one end of the resistor R7 and the source of the MOS tube Q3, the diode D1 is connected in parallel to the source and drain of the MOS tube Q3, the resistor R11 is connected in parallel to the two ends of the diode D1, the drain of the MOS tube Q3 is respectively connected to one end of the resistor R9, one end of the capacitor C6, one end of the capacitor C7, one end of the resistor R12, one end of the resistor R15, and one end of the coil L1 of the transformer T1, the other end of the coil L1 of the transformer T1 is respectively connected to the other end of the resistor R15 and the collector of the transistor Q5, the base of the transistor Q5 is respectively connected to the other end of the resistor R12, the resistor R 13 is connected to one end of the transistor Q4, the other end of the resistor R13 is connected in series with the capacitor C8 and then connected to one end of the coil L2 of the transformer T1, the other end of the coil L2 of the transformer T1 is respectively connected to the emitter of the transistor Q5, one end of the resistor R14, the emitter of the transistor Q4, the other end of the capacitor C7, the other end of the capacitor C6, one end of the resistor R10, the gate of the MOS tube Q3, one end of the resistor R8, the other end of the capacitor C5, and the negative output end of the solar cell panel 6, the other end of the resistor R8 is connected to the other end of the resistor R7, the other end of the resistor R10 is connected to the other end of the resistor R9, and the coil L3 of the transformer T1 is connected in parallel to both ends of the input positive end and the input negative end of the rectifier bridge T2;

[0034] The other end of the resistor R14 is respectively connected to the base of the transistor Q4 and the positive electrode of the diode D3. The negative electrode of the diode D3 is respectively connected to one end of the resistor R16 and one end of the resistor R17. The other end of the resistor R16 is respectively connected to the output positive end of the rectifier bridge T2, one end of the capacitor C9, one end of the capacitor C10, one end of the capacitor C11, one end of the inductor L4, one end of the resistor R18, and the IN end of the voltage regulator chip U1. The other end of the resistor R18 is connected to the EN end of the voltage regulator chip U1. The output negative end of the rectifier bridge T2 is respectively connected to the other end of the resistor R17, the other end of the capacitor C9, the other end of the capacitor C10, the other end of the capacitor C11, the GND end of the voltage regulator chip U1, one end of the resistor R19, one end of the capacitor C12, one end of the capacitor C13, one end of the resistor R24, and the negative input end of the battery 12. The SW end of the voltage regulator chip U1 is respectively connected to the other end of the inductor L4, the diode C13, the GND end of the voltage regulator chip U1 ... The positive electrode of the diode D4 is connected, the negative electrode of the diode D4 is respectively connected to one end of the resistor R20, the other end of the capacitor C12, the other end of the capacitor C13, and one end of the fuse F1, the other end of the resistor R20 is respectively connected to the FB end of the voltage stabilizing chip U1 and the other end of the resistor R19, the other end of the fuse F1 is connected to the positive electrode of the diode D5, the negative electrode of the diode D5 is respectively connected to the emitter of the transistor Q6 and one end of the resistor R21, the other end of the resistor R21 is respectively connected to one end of the resistor R22 and the emitter of the transistor Q7, the collector of the transistor Q7 is respectively connected to the positive electrode of the diode D6 and one end of the resistor R23, the other end of the resistor R23 is respectively connected to the other end of the resistor R22 and the base of the transistor Q6, the negative electrode of the diode D6 is connected to the positive input end of the battery 12, and the other end of the resistor R24 ​​is respectively connected to the base of the transistor Q7 and the collector of the transistor Q6.

[0035] Specifically, the solar panel 6 transmits the voltage to the surge protection circuit 7, the resistor R7 and the resistor R8 form a first voltage detection circuit, which can detect the voltage output by the solar panel 6, the resistor R9 and the resistor R10 form a second voltage detection circuit, which can detect the voltage at the output end of the surge protection circuit 7, and the resistor R11 is a voltage divider resistor, and the resistance value of the voltage divider resistor R11 is 40-200Ω; the surge protection circuit 7 can avoid surges in the solar power generation line, and the power supply is stable and reliable, avoiding damage to the electronic components of the air detector; the voltage processed by the surge protection circuit 7 is transmitted to the charging circuit 8, and processed by the charging circuit 8 to obtain a stable voltage; through the voltage stabilizing circuit 9, a constant voltage is output to the overcurrent protection circuit 10, and the voltage passes through the fuse and the diode D5 to protect the power supply. When working normally, the base of transistor Q7 is grounded through R24, and transistor Q7 is saturated and turned on. When the current increases sharply due to a short circuit on site or other reasons, the voltage difference generated by the loop current on resistor R21 will make transistor Q6 saturated and turned on. At this time, the voltage generated on resistor R24 ​​will turn off transistor Q7, thereby achieving the purpose of closing the channel loop; when the on-site conditions return to normal, the loop current is small, and the voltage across resistor R21 is very small and insufficient to maintain the conduction of transistor Q6, so that transistor Q6 is cut off, resulting in a decrease in the voltage on R24, transistor Q7 is turned on, and the circuit returns to normal; the overcurrent protection circuit will protect the channel loop current and protect the signal input channel; charging is carried out through the solar panel 6, converting solar energy into electrical energy, saving energy, and having a wide range of applicability. Example 3

[0036] like Figure 4 As shown, the signal conditioning circuit 111 includes an operational amplifier Q1, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2; the filter amplifier circuit 112 includes an operational amplifier Q2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a sliding rheostat RT1, a capacitor C3 and a capacitor C4; the operational amplifier Q1 and the operational amplifier Q2 are of model TLC271, and the operational amplifier Q2 has the characteristics of low offset voltage drift, a wide range of input offset voltage levels and high input impedance, and has a bias selection function. In the bias selection function mode, the power consumption can be reduced, thereby extending the service life of the battery 12.

[0037] The non-inverting input terminal of the operational amplifier Q1 is connected to the first terminal of the interface U1, the second terminal of the interface U1 is grounded, the inverting input terminal and the negative pole of the power supply of the operational amplifier Q1 are grounded, the positive pole of the power supply of the operational amplifier Q1 is connected in series with the resistor R2 and then connected to the 5V power supply terminal, the connection line between the positive pole of the power supply of the operational amplifier Q1 and the resistor R2 is connected in series with the capacitor C2 and then grounded, the resistor R1 is connected in parallel to the non-inverting input terminal and the output terminal of the operational amplifier Q1, the capacitor C1 is connected in parallel to the two ends of the resistor R1, the output terminal of the operational amplifier Q1 is connected in series with the resistor R3 and the resistor R4 in sequence and then connected to the non-inverting input terminal of the operational amplifier Q2. The connection between resistors R3 and R4 is connected in series with capacitor C3 and then grounded. The connection between resistors R3 and R4 is connected to the first fixed end of the sliding rheostat RT1. The second fixed end of the sliding rheostat RT1 is connected to the sliding end of the sliding rheostat RT1 and is connected to one end of capacitor C4, the output end of the operational amplifier Q2, and one end of resistor R6. The other end of capacitor C4 is connected to the non-inverting input end of the operational amplifier Q2. The inverting input end of the operational amplifier Q1 is connected in series with resistor R5 and then grounded. The other end of resistor R6 is connected to the input end of the AD conversion circuit 113. The interface U1 is electrically connected to the sensor group.

[0038] Specifically, the current signal collected by the sensor group is transmitted to the operational amplifier Q1 through the interface U1. The operational amplifier Q1, the resistor R1, the capacitor C1, the resistor R2 and the capacitor C2 form a voltage parallel negative feedback circuit, which can convert the input current signal into a voltage signal. At the same time, the resistor R2 and the capacitor C2 form a filter circuit, which can filter out unnecessary interference; the signal output by the signal conditioning circuit 111 is transmitted to the filter amplifier circuit 112, the resistor R3 and the capacitor C3 filter the signal, which can filter out the interference of the external circuit on the signal and improve the effectiveness of the signal. The filtered signal is amplified by the operational amplifier Q2, so that the filter amplifier circuit 112 outputs a stable voltage signal to the AD conversion circuit 113; the sliding rheostat RT1 is an adjustable resistor, which is used to adjust the amplification gain and stabilize the amplification output; the signal conditioning circuit 111 can improve the load capacity; the low-pass filter amplifier circuit 112 can improve the signal-to-noise ratio of the circuit, effectively amplify the signal, and avoid the loss and inaccuracy of the collected data. Example 4

[0039] Based on the first embodiment, the positioning circuit includes a Beidou circuit and a base station circuit.

[0040] When the positioning circuit is a Beidou circuit, the single-chip computer 114 sends an inquiry signal to the satellite, the satellite sends the location data to the single-chip computer 114, and the single-chip computer 114 sends the location data to the background monitoring center; when the positioning circuit is a base station circuit, the built-in SIM card of the air detector is used to communicate with the base station to obtain the location data of the air detector, and send the location data to the background monitoring center; through the positioning circuit, the staff does not need to collect air outside with the air detector, thereby improving work efficiency.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air detector with a positioning function, comprising a housing (1), characterized in that: The housing (1) is provided with a display screen (2), a button (3) and an indicator light (4); a side of the housing (1) is provided with an air guide channel (5) penetrating the housing (1); an inner wall of the air guide channel (5) is provided with a sensor group; a circuit board (11) is provided inside the housing (1); and the display screen (2), the button (3), the indicator light (4) and the sensor group are electrically connected to the circuit board (11) respectively; The circuit board (11) is provided with a signal conditioning circuit (111), a filter amplifier circuit (112), an AD conversion circuit (113), a single chip computer (114), a positioning circuit (115) and a communication circuit (116); the input end of the signal conditioning circuit (111) is electrically connected to the sensor group; the output end of the signal conditioning circuit (111) is connected to the input end of the filter amplifier circuit (112); the output end of the filter amplifier circuit (112) is connected to the input end of the AD conversion circuit (113); the output end of the AD conversion circuit (113) is connected to the input end of the single chip computer (114); the positioning circuit (115) is connected to the input end of the single chip computer (114); and the output end of the single chip computer (114) is connected to a background monitoring center through a communication circuit (116); It also includes a power supply module, the power supply module including: a solar panel (6), a surge protection circuit (7), a charging circuit (8), a voltage stabilizing circuit (9), an overcurrent protection circuit (10) and a storage battery (12), the solar panel (6) being electrically connected to the storage battery (12) via the surge protection circuit (7), the charging circuit (8), the voltage stabilizing circuit (9) and the overcurrent protection circuit (10) in sequence, and the storage battery (12) being electrically connected to an input terminal of the single-chip computer (114); The surge protection circuit (7) comprises a capacitor C5, a capacitor C6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, and a MOS tube Q3; the charging circuit (8) comprises a transistor Q4, a transistor Q5, and a rectifier bridge T2; the voltage stabilizing circuit (9) comprises a voltage stabilizing chip U1 and an inductor L4; the overcurrent protection circuit (10) comprises a transistor Q6 and a transistor Q7; One end of the capacitor C5 is respectively connected to the positive electrode of the diode D2 and the positive output end of the solar cell panel (6); the negative electrode of the diode D2 is respectively connected to one end of the resistor R7 and the source of the MOS tube Q3; the diode D1 is connected in parallel to the source and drain of the MOS tube Q3; the resistor R11 is connected in parallel to the two ends of the diode D1; the drain of the MOS tube Q3 is respectively connected to one end of the resistor R9, one end of the capacitor C6, one end of the capacitor C7, one end of the resistor R12, one end of the resistor R15, and one end of the coil L1 of the transformer T1; the other end of the coil L1 of the transformer T1 is respectively connected to the other end of the resistor R15 and the collector of the transistor Q5; the base of the transistor Q5 is respectively connected to the other end of the resistor R12, the resistor R 13 is connected to one end of the resistor R13 and the collector of the transistor Q4, the other end of the resistor R13 is connected in series with the capacitor C8 and then connected to one end of the coil L2 of the transformer T1, the other end of the coil L2 of the transformer T1 is respectively connected to the emitter of the transistor Q5, one end of the resistor R14, the emitter of the transistor Q4, the other end of the capacitor C7, the other end of the capacitor C6, one end of the resistor R10, the gate of the MOS tube Q3, one end of the resistor R8, the other end of the capacitor C5, and the negative output end of the solar cell panel (6), the other end of the resistor R8 is connected to the other end of the resistor R7, the other end of the resistor R10 is connected to the other end of the resistor R9, and the coil L3 of the transformer T1 is connected in parallel to both ends of the positive input end and the negative input end of the rectifier bridge T2; The other end of the resistor R14 is respectively connected to the base of the transistor Q4 and the positive electrode of the diode D3. The negative electrode of the diode D3 is respectively connected to one end of the resistor R16 and one end of the resistor R17. The other end of the resistor R16 is respectively connected to the output positive end of the rectifier bridge T2, one end of the capacitor C9, one end of the capacitor C10, one end of the capacitor C11, one end of the inductor L4, one end of the resistor R18, and the IN end of the voltage regulator chip U1. The other end of the resistor R18 is connected to the EN end of the voltage regulator chip U1. The output negative end of the rectifier bridge T2 is respectively connected to the other end of the resistor R17, the other end of the capacitor C9, the other end of the capacitor C10, the other end of the capacitor C11, the GND end of the voltage regulator chip U1, one end of the resistor R19, one end of the capacitor C12, one end of the capacitor C13, one end of the resistor R24, and the negative input end of the battery (12). The SW end of the voltage regulator chip U1 is respectively connected to the other end of the inductor L4, the diode C10, the capacitor C11, the GND end of the voltage regulator chip U1, the resistor R19, the capacitor C12, the capacitor C13, the resistor R24, and the negative input end of the battery (12). The positive electrode of the diode D4 is connected, the negative electrode of the diode D4 is respectively connected to one end of the resistor R20, the other end of the capacitor C12, the other end of the capacitor C13, and one end of the fuse F1, the other end of the resistor R20 is respectively connected to the FB end of the voltage regulator chip U1 and the other end of the resistor R19, the other end of the fuse F1 is connected to the positive electrode of the diode D5, the negative electrode of the diode D5 is respectively connected to the emitter of the transistor Q6 and one end of the resistor R21, the other end of the resistor R21 is respectively connected to one end of the resistor R22 and the emitter of the transistor Q7, the collector of the transistor Q7 is respectively connected to the positive electrode of the diode D6 and one end of the resistor R23, the other end of the resistor R23 is respectively connected to the other end of the resistor R22 and the base of the transistor Q6, the negative electrode of the diode D6 is connected to the positive input terminal of the battery (12), and the other end of the resistor R24 ​​is respectively connected to the base of the transistor Q7 and the collector of the transistor Q6; The signal conditioning circuit (111) comprises an operational amplifier Q1, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2; the filter amplifier circuit (112) comprises an operational amplifier Q2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a sliding rheostat RT1, a capacitor C3 and a capacitor C4; The non-inverting input terminal of the operational amplifier Q1 is connected to the first terminal of the interface U1, the second terminal of the interface U1 is grounded, the inverting input terminal and the negative pole of the power supply of the operational amplifier Q1 are grounded, the positive pole of the power supply of the operational amplifier Q1 is connected in series with the resistor R2 and then connected to the 5V power supply terminal, the connection line between the positive pole of the power supply of the operational amplifier Q1 and the resistor R2 is connected in series with the capacitor C2 and then grounded, the resistor R1 is connected in parallel to the non-inverting input terminal and the output terminal of the operational amplifier Q1, the capacitor C1 is connected in parallel to the two ends of the resistor R1, the output terminal of the operational amplifier Q1 is connected in series with the resistor R3 and the resistor R4 in sequence and then connected to the non-inverting input terminal of the operational amplifier Q2. The input end is connected, the connection between resistors R3 and R4 is connected in series with capacitor C3 and then grounded, the connection between resistors R3 and R4 is connected to the first fixed end of the sliding rheostat RT1, the second fixed end of the sliding rheostat RT1 is connected to the sliding end of the sliding rheostat RT1 and is connected to one end of capacitor C4, the output end of the operational amplifier Q2, and one end of resistor R6, the other end of capacitor C4 is connected to the non-inverting input end of the operational amplifier Q2, the inverting input end of the operational amplifier Q1 is connected in series with resistor R5 and then grounded, the other end of resistor R6 is connected to the input end of the AD conversion circuit, and the interface U1 is electrically connected to the sensor group.

2. The air detector with positioning function according to claim 1, characterized in that: The positioning circuit (115) comprises a Beidou circuit and a base station circuit.

3. The air detector with positioning function according to claim 1, characterized in that: The sensor group includes a formaldehyde sensor, a temperature and humidity sensor, a dust sensor, a carbon monoxide sensor and a sulfide sensor.

4. The air detector with positioning function according to claim 1, characterized in that: The communication circuit (116) is a WIFI module, a GPRS communication module, a 3G communication module, or a CDMA communication module.

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