CN-224216511-U - PM2.5 detection device

Abstract

The application belongs to the technical field of particulate matter measurement, and provides a PM2.5 detection device which comprises a processing circuit, a PM2.5 concentration detection circuit and a conversion circuit, wherein the PM2.5 concentration detection circuit is connected with the processing circuit to transmit a detection feedback signal generated in a starting state, the processing circuit is connected with the conversion circuit to transmit a conversion voltage signal generated according to the detection feedback signal, the conversion circuit generates a target current signal through voltage-current conversion by utilizing a target voltage signal gradually approaching to the conversion voltage signal, and the current value of the target current signal is in a preset current range. And a worker controls the starting state of the PM2.5 concentration detection circuit through the processing circuit, and the target current signal can be adapted to industrial control equipment with various analog quantities required to be output as current signals through adjusting the voltage-current conversion proportion in the conversion circuit.

Inventors

• LIN FENG

Assignees

• 上海智位机器人股份有限公司

Dates

Publication Date

20260508

Application Date

20250519

Claims (13)

1. 1. The PM2.5 detection device is characterized by comprising a PM2.5 concentration detection circuit, a processing circuit and a conversion circuit, wherein the PM2.5 concentration detection circuit is connected with the processing circuit to transmit a detection feedback signal generated in a starting state, the processing circuit is connected with the conversion circuit to transmit a conversion voltage signal generated according to the detection feedback signal, and the conversion circuit is used for converting the conversion voltage signal into a target current signal, and the current value of the target current signal is in a preset current range.
2. 2. The apparatus of claim 1, wherein the predetermined current range is 4-20mA.
3. 3. The apparatus of claim 1, wherein the PM2.5 concentration detection circuit has a detection configuration terminal and a detection transceiver terminal, and the processing circuit has a control output terminal, a feedback input terminal, and a feedback output terminal; the detection configuration end is connected with the control output end to receive a control signal from the processing circuit, the PM2.5 concentration detection circuit is switched to a starting state according to the control signal, the detection receiving end is connected with the feedback input end to transmit a detection feedback signal generated by the PM2.5 concentration detection circuit in the starting state, the feedback output end is connected with the input end of the conversion circuit to transmit a conversion voltage signal generated according to the detection feedback signal, and the output end of the conversion circuit outputs the target current signal.
4. 4. The apparatus of claim 1, wherein the conversion circuit comprises a comparison sub-circuit, a control sub-circuit, and an output sub-circuit, the comparison sub-circuit having a first comparison input, a second comparison input, and a differential output, the control sub-circuit having a first end, a second end, and a control end; The first comparison input end is connected with the processing circuit to be connected with the conversion voltage signal, the second comparison input end is connected with the input end of the output sub-circuit to be connected with the target voltage signal, the differential output end is connected with the control end of the control sub-circuit to transmit a differential voltage signal generated according to the conversion voltage signal and the target voltage signal, the first end is used for being connected with a source voltage signal, the second end is connected with the output sub-circuit to be connected with the target voltage signal, when the voltage value of the differential voltage signal reaches a preset value, the first end and the second end are conducted to enable the source voltage signal to charge the target voltage signal, and the output sub-circuit is used for converting the target voltage signal into the target current signal.
5. 5. The apparatus of claim 4, wherein the conversion circuit further comprises a conversion power supply circuit having a first resistor with one end for connecting to a charging power supply (VCC) to access an original voltage signal and the other end for connecting to the first end to transmit the source voltage signal generated from the original voltage signal.
6. 6. The apparatus of claim 4, wherein the comparison sub-circuit comprises an amplifier (U3), a second resistor (R2) and a third resistor (R3), wherein a positive input terminal of the amplifier is connected to one end of the second resistor, the other end of the second resistor is used as the first comparison input terminal, a negative input terminal of the amplifier is used as the second comparison input terminal, a power supply positive terminal of the amplifier is connected to a third power supply voltage signal, a power supply negative terminal of the amplifier is connected to a reference ground signal, an output terminal of the amplifier is connected to one end of the third resistor, and the other end of the third resistor is used as the differential output terminal.
7. 7. The apparatus of claim 6, wherein the comparison subcircuit further comprises a fifth voltage stabilizing capacitor (C5), one end of which is connected to the supply positive terminal of the amplifier, the other end of which is connected to a reference ground signal.
8. 8. The apparatus of claim 4, wherein the control sub-circuit comprises a semiconductor field effect transistor (Q1) having a gate as the control terminal, a source as the second terminal, and a drain as the first terminal.
9. 9. The apparatus of claim 4, wherein the output sub-circuit comprises a fourth resistor, a first end of the fourth resistor being an input of the output sub-circuit to be connected to the target voltage signal, the other end of the fourth resistor being connected to a reference ground signal, a resistance value of the fourth resistor being adjustable, a current flowing through the fourth resistor being the target current signal.
10. 10. The apparatus of claim 4, further comprising a power supply configuration circuit having an input for connecting a power supply (VIP) to access an original power supply signal, a first output of the power supply configuration circuit being connected to the PM2.5 concentration detection circuit to transmit a first power supply voltage signal (V1) generated from the original power supply signal, a second output of the power supply configuration circuit being connected to the processing circuit to transmit a second power supply voltage signal (V2) generated from the original power supply signal, the first power supply voltage signal being different from the second power supply voltage signal, the first power supply voltage signal powering the PM2.5 concentration detection circuit, the second power supply voltage signal powering the processing circuit.
11. 11. The apparatus of claim 10, wherein the power supply configuration circuit comprises a power supply control chip, an input of the power supply control chip serving as an input of the power supply configuration circuit to access the original power supply signal, an input of the power supply configuration circuit connected to the first output such that a voltage value of the first power supply voltage signal is equal to a voltage value of the original power supply signal, a ground of the power supply control chip connected to a reference ground signal, an output of the power supply control chip serving as a second output of the power supply configuration circuit, a voltage value of the first power supply voltage signal being 5V, and a voltage value of the second power supply voltage signal being 3.3V.
12. 12. The apparatus of claim 11, wherein the power supply configuration circuit further comprises a first voltage stabilizing capacitor and a second voltage stabilizing capacitor, wherein one end of the first voltage stabilizing capacitor is connected to the input end of the power distribution chip, the other end of the first voltage stabilizing capacitor is connected to the reference ground signal, one end of the first voltage stabilizing capacitor is connected to the output end of the power distribution chip, and the other end of the first voltage stabilizing capacitor is connected to the reference ground signal.
13. 13. The apparatus of claim 10, wherein the processing circuit comprises a processor and a third voltage regulator capacitor, a power supply input of the processor for coupling in the second power supply voltage signal, one end of the third voltage regulator capacitor connected to the power supply input, and the other end of the third voltage regulator capacitor coupled to a reference ground signal; The PM2.5 concentration detection circuit comprises a PM2.5 sensor and a fourth voltage stabilizing capacitor, wherein a power supply end of the PM2.5 sensor is used for being connected with the first power supply voltage signal, one end of the fourth voltage stabilizing capacitor is connected with the power supply end, and the other end of the fourth voltage stabilizing capacitor (C4) is connected with a reference ground signal.

Description

PM2.5 detection device Technical Field The utility model relates to the technical field of particulate matter measurement, in particular to a PM2.5 detection device. Background As the environmental concept goes deep into mind, PM2.5 values are becoming a common measure in the field of industrial manufacturing. The PM2.5 detection device detects the concentration of fine particles in the air, and outputs an analog quantity corresponding to a concentration result according to a set standard of a manufacturer. Since the manufacturer of the PM2.5 detection apparatus may vary, the standards set by the manufacturer may also vary, so that even the same analog quantity may correspond to different fine particulate matter concentrations. Therefore, the PM2.5 detection apparatus on the market is only applicable to industrial control equipment corresponding to the factory setting standard, and has no wide applicability. Moreover, the analog output of the PM2.5 device on the market only supports voltage signals, and is not applicable to some industrial control devices that require current signals as PM2.5 sensing signals. Disclosure of utility model The application aims to provide a PM2.5 detection device which is suitable for industrial control equipment with an analog quantity required to be output as a current signal. The application provides a PM2.5 detection device, which adopts the following technical scheme: The PM2.5 detection device comprises a PM2.5 concentration detection circuit, a processing circuit and a conversion circuit, wherein the PM2.5 concentration detection circuit is connected with the processing circuit to transmit a detection feedback signal generated in a starting state, the processing circuit is connected with the conversion circuit to transmit a conversion voltage signal generated according to the detection feedback signal, the conversion circuit is used for converting the conversion voltage signal into a target current signal, and the current value of the target current signal is in a preset current range. Through the technical scheme, the PM2.5 concentration detection circuit in the starting state detects the concentration of the fine particles in the environment, and generates a corresponding detection feedback signal according to the set standard of the manufacturer, wherein the detection feedback signal is an electrical signal obtained by direct detection. The processing circuit processes the detection feedback signal to obtain a converted voltage signal, and the converted voltage signal can fully reflect the concentration of the fine particles. Then, the conversion circuit performs conversion processing on the converted voltage signal to obtain a corresponding target current signal, wherein the target current signal is an electric signal in a current form and can be suitable for industrial control equipment with the connected analog quantity being the current signal. And, the staff can control the output range of the target current signal by adjusting the conversion ratio of voltage to current in the conversion circuit, so that the target current signal is in a preset current range, ensure that the target current signal can be recognized and received by any industrial control equipment, and carry out subsequent operation and other processing according to the target current signal indicating the concentration of fine particles (PM 2.5). The PM2.5 detection device is suitable for wide application of industrial control equipment with the accessed analog quantity being a current signal. In one embodiment, the preset current range is 4-20mA. According to the technical scheme, the 4-20mA analog quantity input is a common analog quantity control mode, so that the method has good stability, reliability and high precision, and is widely applied to industrial control equipment, and the target current signal can be suitable for various industrial control equipment. In one embodiment, the PM2.5 concentration detection circuit has a detection configuration terminal and a detection transceiver terminal, and the processing circuit has a control output terminal, a feedback input terminal and a feedback output terminal; the detection configuration end is connected with the control output end to receive a control signal from the processing circuit, the PM2.5 concentration detection circuit is switched to a starting state according to the control signal, the detection receiving end is connected with the feedback input end to transmit a detection feedback signal generated by the PM2.5 concentration detection circuit in the starting state, the feedback output end is connected with the input end of the conversion circuit to transmit a conversion voltage signal generated according to the detection feedback signal, and the output end of the conversion circuit outputs the target current signal. Through the technical scheme, the processing circuit controls the PM2.5 concentration detection circuit to be in the s