PH voltage signal conversion circuit with single-point correction

Abstract

The utility model discloses a PH voltage signal conversion circuit with single-point correction, which comprises an MCU circuit, an RS485 circuit, a signal acquisition circuit, a step-down 5V output circuit, a 5V-to-3. 3V voltage stabilizing circuit and a 5V-to-positive / negative 5V voltage conversion circuit, the signal acquisition circuit is connected with the RS485 circuit, the RS485 circuit is connected with the MCU circuit, the step-down 5V output circuit is connected with the 5V-to-3. 3V voltage stabilizing circuit and the 5V-to-positive / negative 5V voltage conversion circuit, and the signal acquisition circuit is connected with the MCU circuit. The 5V-to-3. 3V voltage stabilizing circuit is connected with the MCU circuit, and the 5V-to-3. 3V voltage stabilizing circuit and the 5V-to-3. 3V voltage converting circuit are both connected with the signal acquisition circuit. According to the PH voltage signal conversion circuit with the single-point correction function, PH voltage signals and NTC temperature resistance signals can be converted into digital values, reading is convenient, single-point correction, two-point correction and temperature compensation processing are carried out on PH measured values, a certain anti-interference effect is achieved, input signals are more stable, and measurement is more accurate.

Description

Technical Field

[0001] This utility model relates to the field of pH voltage signal detection, and in particular to a pH voltage signal conversion circuit with single-point correction. Background Technology

[0002] A pH voltage signal conversion circuit is a circuit used to detect pH voltage signals. It is applied in pH measurement sensors and can convert the current signal output by the pH sensor into a voltage signal of 0-5V. With the continuous development of technology, people have increasingly higher requirements for the manufacturing process of pH voltage signal conversion circuits.

[0003] Existing pH voltage signal circuits have certain drawbacks. First, they cannot quickly read pH values, and digital conversion is cumbersome and inconvenient for users. Second, they lack proper temperature compensation and correction, which can lead to errors and poor input signal stability, negatively impacting practical applications. Therefore, we propose a pH voltage signal conversion circuit with single-point correction. Utility Model Content

[0004] Technical problem to be solved: In view of the shortcomings of the prior art, this utility model provides a pH voltage signal conversion circuit with single-point correction, which can convert both pH voltage signal and NTC temperature resistance signal into digital quantities for easy reading. It performs single-point correction, two-point correction and temperature compensation processing on pH measurement value, has a certain anti-interference effect, makes the input signal more stable, and can effectively solve the problems in the background technology.

[0005] Technical Solution: To achieve the above objectives, the technical solution adopted by this utility model is as follows: a pH voltage signal conversion circuit with single-point correction, comprising an MCU circuit, an RS485 circuit, a signal acquisition circuit, a 5V step-down output circuit, a 5V to 3.3V voltage regulator circuit, and a 5V to ±5V voltage circuit. The signal acquisition circuit is connected to the RS485 circuit, the RS485 circuit is connected to the MCU circuit, the 5V step-down output circuit is connected to the 5V to 3.3V voltage regulator circuit and the 5V to ±5V voltage circuit, the 5V to 3.3V voltage regulator circuit is connected to the MCU circuit, and both the 5V to 3.3V voltage regulator circuit and the 5V to ±5V voltage circuit are connected to the signal acquisition circuit.

[0006] Preferably, the step-down 5V output circuit supplies power to the MCU circuit through a 5V to 3.3V voltage regulator circuit, and the output terminal of the signal acquisition circuit is connected to the input terminal of the MCU circuit through an RS485 circuit.

[0007] Preferably, the signal acquisition circuit includes a PH voltage signal acquisition circuit and an NTC temperature resistance signal circuit, that is, the signal acquisition circuit inputs two analog quantities, namely the PH voltage signal and the NTC temperature resistance signal.

[0008] Preferably, the signal acquisition circuit internally converts both the PH voltage signal and the NTC temperature resistance signal into digital quantities.

[0009] Preferably, the signal acquisition circuit internally includes a single-point correction circuit, a two-point correction circuit, and a temperature compensation circuit. The signal acquisition circuit performs single-point correction, two-point correction, and temperature compensation on the pH measurement value, and performs single-point correction on the temperature measurement value.

[0010] Preferably, the signal acquisition circuit is connected to the host computer via an MCU circuit, and the host computer reads the pH measurement value and the temperature measurement value.

[0011] Beneficial effects: Compared with the prior art, this utility model provides a pH voltage signal conversion circuit with single-point correction, which has the following beneficial effects: This pH voltage signal conversion circuit with single-point correction can convert both pH voltage signal and NTC temperature resistance signal into digital quantities, which are easy to read. It performs single-point correction, two-point correction and temperature compensation processing on pH measurement values, and has a certain anti-interference effect, making the input signal more stable.

[0012] The circuit inputs a 9~36VDC power supply; it inputs two analog signals: a pH voltage signal and an NTC temperature resistance signal; the circuit can convert both the pH voltage signal and the NTC temperature resistance signal into digital values; the circuit program can perform single-point calibration, two-point calibration, and temperature compensation for pH measurements; the circuit program can also perform single-point calibration for temperature measurements; the circuit outputs digital values ​​conforming to the 485 Modbus RTU protocol; users can access the circuit through host computer software to read pH and temperature measurement values. The entire pH voltage signal conversion circuit has a simple structure, is easy to operate, and performs better than traditional methods. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the MCU circuit in a PH voltage signal conversion circuit with single-point correction according to this utility model.

[0014] Figure 2 This is a schematic diagram of the 5V step-down output circuit in a PH voltage signal conversion circuit with single-point correction according to this utility model.

[0015] Figure 3This is a schematic diagram of the 5V to 3.3V voltage regulator circuit in a PH voltage signal conversion circuit with single-point correction according to this utility model.

[0016] Figure 4 This is a schematic diagram of the RS485 circuit in a PH voltage signal conversion circuit with single-point correction according to this utility model.

[0017] Figure 5 This is a schematic diagram of the 5V to positive and negative 5V voltage circuit in a PH voltage signal conversion circuit with single-point correction according to this utility model.

[0018] Figure 6 This is a schematic diagram of the signal acquisition circuit in a PH voltage signal conversion circuit with single-point correction according to this utility model. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are only some embodiments of this utility model, not all embodiments, and are only used to illustrate this utility model, and should not be regarded as limiting the scope of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figure 1-6 As shown, a pH voltage signal conversion circuit with single-point correction includes an MCU circuit, an RS485 circuit, a signal acquisition circuit, a 5V step-down output circuit, a 5V to 3.3V voltage regulator circuit, and a 5V to ±5V voltage converter circuit. The signal acquisition circuit is connected to the RS485 circuit, which is connected to the MCU circuit. The 5V step-down output circuit is connected to both the 5V to 3.3V voltage regulator circuit and the 5V to ±5V voltage converter circuit. The 5V to 3.3V voltage regulator circuit is connected to the MCU circuit. Both the 5V to 3.3V voltage regulator circuit and the 5V to ±5V voltage converter circuit are connected to the signal acquisition circuit. This circuit can convert both the pH voltage signal and the NTC temperature resistance signal into digital quantities for easy reading. It performs single-point correction, two-point correction, and temperature compensation processing on the pH measurement value, providing a certain degree of anti-interference effect and making the input signal more stable.

[0023] Furthermore, the step-down 5V output circuit supplies power to the MCU circuit through a 5V to 3.3V voltage regulator circuit, and the output of the signal acquisition circuit is connected to the input of the MCU circuit through an RS485 circuit.

[0024] Furthermore, the signal acquisition circuit includes a PH voltage signal acquisition circuit and an NTC temperature resistance signal acquisition circuit. That is, the signal acquisition circuit inputs two analog quantities, namely the PH voltage signal and the NTC temperature resistance signal.

[0025] Furthermore, the signal acquisition circuit internally converts both the PH voltage signal and the NTC temperature resistance signal into digital quantities.

[0026] Furthermore, the signal acquisition circuit is equipped with a single-point correction circuit, a two-point correction circuit, and a temperature compensation circuit. The signal acquisition circuit performs single-point correction, two-point correction, and temperature compensation on the pH measurement value, and performs single-point correction on the temperature measurement value.

[0027] Furthermore, the signal acquisition circuit is connected to the host computer via the MCU circuit, and the host computer reads the pH measurement value and the temperature measurement value.

[0028] Working principle: The circuit input power is 9~36VDC; the circuit inputs two analog signals: pH voltage signal and NTC temperature resistance signal; the circuit can convert the pH voltage signal and the NTC temperature resistance signal into digital signals; the circuit program can perform single-point calibration, two-point calibration, and temperature compensation for pH measurements; the circuit program can perform single-point calibration for temperature measurements; the circuit outputs digital signals conforming to the 485 Modbus RTU protocol; users can access the circuit through host computer software to read pH and temperature measurement values.

[0029] It can convert both the pH voltage signal and the NTC temperature resistance signal into digital values ​​for easy reading. It can perform single-point correction, two-point correction, and temperature compensation on the pH measurement value, and has a certain anti-interference effect, making the input signal more stable.

[0030] It should be noted that, in this document, relational terms such as first and second (number one, number two), etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A pH voltage signal conversion circuit with single-point correction, comprising an MCU circuit, an RS485 circuit, a signal acquisition circuit, a 5V step-down output circuit, a 5V to 3.3V voltage regulator circuit, and a 5V to ±5V voltage converter circuit, characterized in that: The signal acquisition circuit is connected to the RS485 circuit, the RS485 circuit is connected to the MCU circuit, the 5V step-down output circuit is connected to the 5V to 3.3V voltage regulator circuit and the 5V to ±5V voltage circuit, the 5V to 3.3V voltage regulator circuit is connected to the MCU circuit, and both the 5V to 3.3V voltage regulator circuit and the 5V to ±5V voltage circuit are connected to the signal acquisition circuit.

2. The pH voltage signal conversion circuit with single-point correction according to claim 1, characterized in that: The step-down 5V output circuit supplies power to the MCU circuit through a 5V to 3.3V voltage regulator circuit, and the output terminal of the signal acquisition circuit is connected to the input terminal of the MCU circuit through an RS485 circuit.

3. The pH voltage signal conversion circuit with single-point correction according to claim 1, characterized in that: The signal acquisition circuit includes a PH voltage signal acquisition circuit and an NTC temperature resistance signal acquisition circuit. That is, the signal acquisition circuit inputs two analog quantities, namely the PH voltage signal and the NTC temperature resistance signal.

4. The pH voltage signal conversion circuit with single-point correction according to claim 1, characterized in that: The signal acquisition circuit internally converts both the PH voltage signal and the NTC temperature resistance signal into digital quantities.

5. A pH voltage signal conversion circuit with single-point correction according to claim 1, characterized in that: The signal acquisition circuit is equipped with a single-point correction circuit, a two-point correction circuit and a temperature compensation circuit. The signal acquisition circuit performs single-point correction, two-point correction and temperature compensation on the pH measurement value, and performs single-point correction on the temperature measurement value.

6. The pH voltage signal conversion circuit with single-point correction according to claim 1, characterized in that: The signal acquisition circuit is connected to the host computer via an MCU circuit, and the host computer reads the pH and temperature measurement values.

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