Negative feedback type anti-interference multi-parameter water quality meter

Abstract

The utility model discloses a negative feedback type anti-interference multi-parameter water quality meter which comprises a main control module, a plurality of isolation modules, a plurality of negative feedback modules and a plurality of detection probes, the isolation module is connected between the main control module and the detection probe; the negative feedback module is connected between the main control module and the detection probe; the detection probe can transmit acquired data to the main control module through the isolation module and provide a negative feedback signal to the main control module through the negative feedback module; the connection between the detection probes is isolated by adopting the isolation module, and the problem of signal distortion of the detection probes is solved by arranging the negative feedback module, so that the detection probes are isolated from the main control module, the measurement between the detection probes is not interfered, and the measurement value fluctuation of other detection probes is not generated; and normal communication with the main control module can be ensured, the work of the main control module is not influenced, and the practicability is very good.

Description

Technical Field

[0001] The utility model relates to the field of water quality meters, in particular to a negative feedback type anti-interference multi-parameter water quality meter. Background Art

[0002] In ordinary water quality analyzers, multiple probes are directly connected to the main control circuit without isolation, resulting in mutual electrical signal interference between the multiple probes, causing large fluctuations in the detection electrical signals generated during the measurement of other probes. Moreover, there is no negative feedback processing, which will cause distortion of the measurement signal, resulting in a large fluctuation range of the final measurement value, seriously affecting the accuracy and exact value of the measurement value. Therefore, there is an urgent need for a negative feedback type anti-interference multi-parameter water quality meter to solve the above problems. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a negative feedback type anti-interference multi-parameter water quality meter.

[0004] An embodiment of the utility model solves the technical problem by adopting the following technical solution: a negative feedback type anti-interference multi-parameter water quality meter, comprising a main control module, a plurality of isolation modules, a plurality of negative feedback modules and a plurality of detection probes;

[0005] The isolation module is connected between the main control module and the detection probe;

[0006] The negative feedback module is connected between the main control module and the detection probe;

[0007] The detection probe can transmit the collected data to the main control module through the isolation module, and provide a negative feedback signal to the main control module through the negative feedback module.

[0008] As one of the preferred embodiments of the utility model, the isolation module includes a control chip U2, optocouplers EL1-2, resistors R18-21, resistors R25-27, a capacitor C9, inductors F1-2, transient voltage suppressors TVS1-2 and a control chip U2;

[0009] One end of the transient voltage suppressor TVS1 is respectively connected to one end of the inductor F1 and the detection probe, and one end of the transient voltage suppressor TVS1 is respectively connected to one end of the inductor F2 and the detection probe. The other end of the inductor F1 is respectively connected to one end of the resistor R18, one end of the resistor R19, and the B terminal of the control chip U2. The other end of the inductor F2 is respectively connected to the other end of the resistor R19, one end of the resistor R25, and the A terminal of the control chip U2. The other end of the resistor R18 is respectively connected to the VCC terminal and the BGND1 terminal of the control chip U2 through the capacitor C9. The other end of the resistor R25 is connected to the BDD 1 terminal. The other ends of the transient voltage suppressor TVS1 and the transient voltage suppressor TVS2 are connected to the BGND1 terminal;

[0010] The R0 terminal of the control chip U2 is connected to one end of the light-emitting device of the optocoupler EL1. The RE terminal and the DE terminal of the control chip U2 are connected to the BDD 1 terminal. The DI terminal of the control chip U2 is respectively connected to one end of the light-receiving device of the optocoupler EL2 and one end of the resistor R27. The other end of the light-emitting device of the optocoupler EL1 is connected to the BDD 1 terminal through the resistor R20. The other end of the resistor R27 is connected to the BDD1 terminal. One end of the light-receiving device of the optocoupler EL1 is respectively connected to the main control module and one end of the resistor R21. The other end of the light-receiving device of the optocoupler EL 1 is connected to the GND terminal. The other end of the light-receiving device of the optocoupler EL2 is connected to the BGND terminal. One end of the light-emitting device of the optocoupler EL2 is connected to the main control module. The other end of the light-emitting device of the optocoupler EL2 is connected to the VCC terminal through the resistor R26. The other end of the resistor R21 is connected to the VCC terminal.

[0011] As one of the preferred embodiments of the present invention, the negative feedback module includes an optocoupler EL3, an operational amplifier Q10, resistors R28-31, an inductor F3, and a capacitor C12. One end of the inductor F3 is respectively connected to the detection probe and one end of the capacitor C12. The other end of the inductor F3 is connected to the first input terminal of the operational amplifier Q10. The other end of the capacitor C12 is respectively connected to one end of the resistor R30 and one end of the resistor R31. The other end of the resistor R30 is connected to the second input terminal of the operational amplifier Q10. The other end of the resistor R31 is respectively connected to one end of the resistor R29 and the output terminal of the operational amplifier Q10. The other end of the resistor R29 is respectively connected to one end of the resistor R28 and one end of the light-receiving device of the optocoupler EL3. The other end of the resistor R28 is connected to one end of the BDD 1. One end of the light-emitting device of the optocoupler EL3 is connected to the main control module. The other ends of the light-receiving device and the light-emitting device of the optocoupler EL3 are connected to the BGND 1 terminal.

[0012] As one of the preferred embodiments of the present invention, there are three isolation modules, negative feedback modules, and detection probes respectively, and the parameters detected by different detection probes are different.

[0013] As one of the preferred embodiments of the present utility model, a negative feedback anti-interference multi-parameter water quality meter further includes a FLASH module connected between the power supply and the main control module.

[0014] As one of the preferred embodiments of the present utility model, a negative feedback anti-interference multi-parameter water quality meter further includes a status indication module connected between the power supply and the main control module.

[0015] As one of the preferred embodiments of the present utility model, a negative feedback anti-interference multi-parameter water quality meter further includes a key module connected to the main control module.

[0016] The beneficial effects of the present utility model: A negative feedback anti-interference multi-parameter water quality meter includes a main control module, a plurality of isolation modules, a plurality of negative feedback modules, and a plurality of detection probes; the isolation modules are connected between the main control module and the detection probes; the negative feedback modules are connected between the main control module and the detection probes; the detection probes can transmit the collected data to the main control module through the isolation modules, and provide negative feedback signals to the main control module through the negative feedback modules; by using the isolation modules to isolate the connections between the detection probes, and by setting the negative feedback modules to solve the problem of signal distortion of the detection probes, it not only achieves isolation from the main control module, so that the measurements between the detection probes do not interfere with each other and do not cause fluctuations in the measured values of other detection probes, but also can ensure normal communication with the main control module without affecting the operation of the main control module, and has very good practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

[0018] Figure 1 is a schematic block diagram of a negative feedback anti-interference multi-parameter water quality meter;

[0019] Figure 2 is a schematic circuit diagram of a negative feedback anti-interference multi-parameter water quality meter;

[0020] Figure 3 is a schematic circuit diagram of the isolation module;

[0021] Figure 4 is a schematic circuit diagram of the negative feedback module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it cannot be understood as a limitation on the protection scope of the present utility model.

[0023] In the description of the present utility model, the meaning of "a plurality of" is more than two. Understandings such as "greater than", "less than", and "exceeding" do not include the corresponding number, while understandings such as "above", "below", and "within" include the corresponding number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0024] In the description of the present utility model, it should be understood that when it comes to orientation descriptions, such as the orientations or positional relationships indicated by "up", "down", "front", "rear", "left", "right", etc., they are based on the orientations or positional relationships shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model.

[0025] In the present utility model, unless otherwise clearly defined, words such as "arranged", "installed", and "connected" should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected; they can be the communication inside two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0026] Referring to Figures 1 to 4 , a negative feedback type anti-interference multi-parameter water quality meter, comprising a main control module 10, a plurality of isolation modules 20, a plurality of negative feedback modules 30, and a plurality of detection probes 40;

[0027] The isolation module 20 is connected between the main control module 10 and the detection probe 40;

[0028] The negative feedback module 30 is connected between the main control module 10 and the detection probe 40;

[0029] The detection probe 40 can transmit the collected data to the main control module 10 through the isolation module 20, and provide a negative feedback signal to the main control module 10 through the negative feedback module 30.

[0030] In the present utility model, a plurality of detection probes 40 for detecting different parameters are provided on the water quality meter, and an isolation module 20 is provided between each path of the detection probes 40 and the main control module 10, which can avoid measurement interference between the detection probes 40 and does not cause fluctuations in the measured values of other detection probes 40; at the same time, a negative feedback module 30 is provided between each path of the detection probes 40 and the main control module 10, thereby solving the problem of signal distortion of the detection probes 40 and improving the measurement accuracy and accuracy of the measured values of the detection probes 40; the advantages of the present utility model are: by using an isolation module to isolate the connections between the detection probes, and by setting a negative feedback module to solve the problem of signal distortion of the detection probes, it not only achieves isolation from the main control module, so that the measurements between the detection probes do not interfere with each other and do not cause fluctuations in the measured values of other detection probes, but also ensures normal communication with the main control module and does not affect the operation of the main control module, having very good practicability.

[0031] As a preferred embodiment of the isolation module 20, the isolation module 20 includes a control chip U2, optocouplers EL 1-2, resistors R18-21, resistors R25-27, a capacitor C9, inductors F1-2, transient voltage suppressors TVS1-2, and a control chip U2;

[0032] One end of the transient voltage suppressor TVS1 is respectively connected to one end of the inductor F1 and the detection probe 40, one end of the transient voltage suppressor TVS1 is respectively connected to one end of the inductor F2 and the detection probe 40, the other end of the inductor F1 is respectively connected to one end of the resistor R18, one end of the resistor R19, and the B terminal of the control chip U2, the other end of the inductor F2 is respectively connected to the other end of the resistor R19, one end of the resistor R25, and the A terminal of the control chip U2, the other end of the resistor R18 is respectively connected to the VCC terminal of the control chip U2 and the BGND 1 terminal through the capacitor C9, the other end of the resistor R25 is connected to the BDD1 terminal, and the other ends of the transient voltage suppressor TVS1 and the transient voltage suppressor TVS2 are connected to the BGND 1 terminal;

[0033] The R0 terminal of the control chip U2 is connected to one end of the light-emitting device of the optocoupler EL1. The RE terminal and the DE terminal of the control chip U2 are connected to the BDD 1 terminal. The DI terminal of the control chip U2 is respectively connected to one end of the light-receiving device of the optocoupler EL2 and one end of the resistor R27. The other end of the light-emitting device of the optocoupler EL1 is connected to the BDD 1 terminal via the resistor R20. The other end of the resistor R27 is connected to the BDD1 terminal. One end of the light-receiving device of the optocoupler EL1 is respectively connected to the main control module 10 and one end of the resistor R21. The other end of the light-receiving device of the optocoupler EL1 is connected to the GND terminal. The other end of the light-receiving device of the optocoupler EL2 is connected to the BGND terminal. One end of the light-emitting device of the optocoupler EL2 is connected to the main control module 10. The other end of the light-emitting device of the optocoupler EL2 is connected to the VCC terminal via the resistor R26. The other end of the resistor R21 is connected to the VCC terminal.

[0034] As a preferred embodiment of the negative feedback module 30, the negative feedback module 30 includes an optocoupler EL3, an operational amplifier Q10, resistors R28-31, an inductor F3, and a capacitor C12. One end of the inductor F3 is respectively connected to the detection probe 40 and one end of the capacitor C12. The other end of the inductor F3 is connected to the first input terminal of the operational amplifier Q10. The other end of the capacitor C12 is respectively connected to one end of the resistor R30 and one end of the resistor R31. The other end of the resistor R30 is connected to the second input terminal of the operational amplifier Q10. The other end of the resistor R31 is respectively connected to one end of the resistor R29 and the output terminal of the operational amplifier Q10. The other end of the resistor R29 is respectively connected to one end of the resistor R28 and one end of the light-receiving device of the optocoupler EL3. The other end of the resistor R28 is connected to one end of the BDD1. One end of the light-emitting device of the optocoupler EL3 is connected to the main control module 10. The other end of the light-receiving device of the optocoupler EL3 and the other end of the light-emitting device of the optocoupler EL3 are connected to the BGND 1 terminal; wherein, the signal detected by the detection probe 40 is amplified by the operational amplifier Q10 and then fed back to the main control module 10 by the optocoupler EL3 to achieve negative feedback, and the main control module 10 makes adjustments according to the negative feedback signal.

[0035] In one embodiment, the isolation module 20, the negative feedback module 30, and the detection probe 40 are all provided in three or more, and the parameters detected by different detection probes 40 are different; preferably, the parameters for water quality detection are pH value, conductivity, dissolved oxygen, etc., and the corresponding detection probes 40 are used for detection.

[0036] In one embodiment, a negative feedback type anti-interference multi-parameter water quality meter further includes a FLASH module 50 connected between the power supply and the main control module 10.

[0037] In one embodiment, a negative feedback type anti-interference multi-parameter water quality meter further includes a status indication module 60 connected between the power supply and the main control module 10, which is used to indicate the various parameters or status of the water quality meter.

[0038] In one embodiment, a negative feedback anti-interference multi-parameter water quality meter further includes a key module 70 connected to the main control module 10; which is used for power on, power off, function selection, etc.

[0039] Of course, the present invention is not limited to the above embodiments, and those skilled in the art can also make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A negative feedback anti-interference multi-parameter water quality instrument, characterized in that: It comprises a main control module (10), a plurality of isolation modules (20), a plurality of negative feedback modules (30) and a plurality of detection probes (40); The isolation module (20) is connected between the main control module (10) and the detection probe (40); The negative feedback module (30) is connected between the main control module (10) and the detection probe (40); The detection probe (40) can transmit the collected data to the main control module (10) via the isolation module (20), and provide a negative feedback signal to the main control module (10) via the negative feedback module (30).

2. A negative feedback anti-interference multi-parameter water quality meter according to claim 1, characterized in that: The isolation module (20) comprises a control chip U2, an optical coupler EL1-2, resistors R18-21, resistors R25-27, a capacitor C9, an inductor F1-2, a transient voltage suppressor TVS1-2 and a control chip U2; One end of the transient voltage suppressor TVS1 is respectively connected to one end of the inductor F1 and the detection probe (40), one end of the transient voltage suppressor TVS1 is respectively connected to one end of the inductor F2 and the detection probe (40), the other end of the inductor F1 is respectively connected to one end of the resistor R18, one end of the resistor R19 and the B end of the control chip U2, the other end of the inductor F2 is respectively connected to the other end of the resistor R19, one end of the resistor R25 and the A end of the control chip U2, the other end of the resistor R18 is respectively connected to the VCC end and the BGND 1 end of the control chip U2 via the capacitor C9, the other end of the resistor R25 is connected to the BDD1 end, and the other end of the transient voltage suppressor TVS1 and the other end of the transient voltage suppressor TVS2 are connected to the BGND 1 end; The R0 end of the control chip U2 is connected to one end of the optocoupler EL1 light emitter, the RE end of the control chip U2 and the DE end of the control chip U2 are connected to the BDD1 end, the DI end of the control chip U2 is respectively connected to one end of the optocoupler EL2 light receiver and one end of the resistor R27, the other end of the optocoupler EL1 light emitter is connected to the BDD1 end via the resistor R20, the other end of the resistor R27 is connected to the BDD1 end, one end of the optocoupler EL1 light receiver is respectively connected to the main control module (10) and one end of the resistor R21, the other end of the optocoupler EL1 light receiver is connected to the GND end, the other end of the optocoupler EL2 light receiver is connected to the BGND end, one end of the optocoupler EL2 light emitter is connected to the main control module (10), the other end of the optocoupler EL2 light emitter is connected to the VCC end via the resistor R26, and the other end of the resistor R21 is connected to the VCC end.

3. The negative feedback anti-interference multi-parameter water quality meter according to claim 1, characterized in that: The negative feedback module (30) comprises an optical coupler EL3, an operational amplifier Q10, resistors R28-31, an inductor F3 and a capacitor C12, one end of the inductor F3 is respectively connected to the detection probe (40) and one end of the capacitor C12, the other end of the inductor F3 is connected to the first input end of the operational amplifier Q10, the other end of the capacitor C12 is respectively connected to one end of the resistor R30 and one end of the resistor R31, the other end of the resistor R30 is connected to the second input end of the operational amplifier Q10, the other end of the resistor R31 is respectively connected to one end of the resistor R29 and the output end of the operational amplifier Q10, the other end of the resistor R29 is respectively connected to one end of the resistor R28 and one end of the optical coupler EL3 light receiver, the other end of the resistor R28 is connected to one end of BDD1, one end of the optical coupler EL3 light emitter is connected to the main control module (10), and the other end of the optical coupler EL3 light receiver and the other end of the optical coupler EL3 light emitter are connected to the BGND 1 end.

4. The negative feedback anti-interference multi-parameter water quality meter according to claim 1, characterized in that: The isolation module (20), the negative feedback module (30) and the detection probe (40) are all provided in three numbers, and different detection probes (40) detect different parameters.

5. The negative feedback anti-interference multi-parameter water quality meter according to claim 1, characterized in that: It also includes a FLASH module (50) connected between the power supply and the main control module (10).

6. The negative feedback anti-interference multi-parameter water quality meter according to claim 1, characterized in that: It also includes a status indication module (60) connected between the power supply and the main control module (10).

7. The negative feedback anti-interference multi-parameter water quality meter according to claim 1, characterized in that: It also includes a key module (70) connected to the main control module (10).

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