CN209218067U - Soil acidity or alkalinity signal acquisition circuit and electronic equipment - Google Patents
Soil acidity or alkalinity signal acquisition circuit and electronic equipment Download PDFInfo
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- CN209218067U CN209218067U CN201822150602.1U CN201822150602U CN209218067U CN 209218067 U CN209218067 U CN 209218067U CN 201822150602 U CN201822150602 U CN 201822150602U CN 209218067 U CN209218067 U CN 209218067U
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Abstract
The utility model is suitable for field of circuit technology, provide a kind of soil acidity or alkalinity signal acquisition circuit and electronic equipment, wherein, above-mentioned soil acidity or alkalinity signal acquisition circuit includes: sequentially connected pH sensor, differential amplification unit, subtrator and amplifying unit, and the power supply unit for the power supply of pH sensor, differential amplification unit, subtrator and amplifying unit.Soil acidity or alkalinity signal acquisition circuit and electronic equipment provided by the embodiment of the utility model, the original detection signal of two-way for being detected pH sensor by differential amplification unit carry out differential amplification and gain adjustment, original detection signal are made to obtain certain multiple amplification；The difference that two-way detects signal is obtained by subtrator, to convert positive voltage signal for negative voltage signal；Signal is detected to difference by amplifying unit and carries out gain adjustment, so that the amplification detection signal of final output be made to can adapt to the acquisition range of common single-chip microcontroller, to be taken and be identified by monolithic is machine-readable.
Description
Technical field
The utility model belongs to field of circuit technology more particularly to a kind of soil acidity or alkalinity signal acquisition circuit and electronics is set
It is standby.
Background technique
The output signal of common pH sensor is generally the negative voltage signal of amplitude very little, and output signal is generally -200mV
To the voltage signal of -300mV.Since common single-chip microcontroller can not directly read the small negative voltage signal of amplitude, it would therefore be highly desirable to grind
The small negative voltage signal for making a kind of pair of pH sensor output carries out the circuit of proper treatment, thus the soil for detecting pH sensor
Earth pH value signal can be read and be identified by processors such as single-chip microcontrollers.
Utility model content
In view of this, the utility model embodiment provides a kind of soil acidity or alkalinity signal acquisition circuit and electronic equipment,
With solve in the prior art pH sensor detection soil acidity or alkalinity signal cannot by the processors such as single-chip microcontroller read and identify
Problem.
According in a first aspect, the utility model embodiment provides a kind of soil acidity or alkalinity signal acquisition circuit, comprising: pH
Sensor, and the original detection signal progress difference of the first original detection signal and second for being exported to the pH sensor
The differential amplification unit of enhanced processing；Two paths of signals for exporting to the differential amplification unit carries out the subtraction of subtraction process
Unit；Signal for exporting to the subtrator amplifies the amplifying unit of processing；The respectively described differential amplification list
The power supply unit of member, subtrator and amplifying unit power supply.
With reference to first aspect, in first aspect first embodiment, the differential amplification unit includes: resistance R1, electricity
Hinder R2, resistance R3, resistance R4, adjustable resistance RP1, amplifier U2A and amplifier U2B；The non-inverting input terminal of the amplifier U2A
The first output end of the pH sensor is connected through the resistance R1, and receives the first original detection of the pH sensor output
Signal；The output end of the amplifier U2A is connect through the resistance R3 with the inverting input terminal of the amplifier U2A；It is described to put
The output end of big device U2A exports first detection signal；The non-inverting input terminal of the amplifier U2B is through described in the resistance R2 connection
The second output terminal of pH sensor, and receive the second original detection signal of the pH sensor output；The amplifier U2B's
Output end is connect through the resistance R4 with the inverting input terminal of the amplifier U2B；The output end output the of the amplifier U2B
Two detection signals；The adjustable resistance RP1 be connected to the amplifier U2A inverting input terminal and the amplifier U2B it is anti-
Between phase input terminal.
With reference to first aspect, in first aspect second embodiment, the subtrator includes: amplifier U3A, resistance
R5, resistance R6, resistance R7 and resistance R8；The inverting input terminal of the amplifier U3A receives the difference through the resistance R5 and puts
The first detection signal of big unit output；The output end of the amplifier U3A is anti-through the resistance R7 and amplifier U3A's
The connection of phase input terminal；The non-inverting input terminal of the amplifier U3A receives the differential amplification unit output through the resistance R6
Second detection signal；The non-inverting input terminal of the amplifier U3A is grounded through the resistance R8；The output end of the amplifier U3A
It exports difference and detects signal.
With reference to first aspect, in first aspect third embodiment, the amplifying unit includes: amplifier U4A, resistance
R9 and adjustable resistance RP2；The inverting input terminal of the amplifier U4A receives the difference of the subtrator output through the resistance R9
Value detection signal；Inverting input terminal of the output end of the amplifier U4A through the adjustable resistance RP2 Yu the amplifier U4A
Connection；The output end of the amplifier U4A exports amplification detection signal.
Third embodiment with reference to first aspect, in the 4th embodiment of first aspect, the amplifying unit further include:
Resistance R10, resistance R11, capacitor C11 and capacitor C15；The output end of one end of the resistance R10 and the amplifier U4A connect
It connects, the other end of the resistance R10 is connect with one end of the resistance R11, and the other end of the resistance R11 exports the amplification
Detect signal；The capacitor C11 is connected between the resistance R10 and the tie point and ground of resistance R11；The capacitor C15 connects
It connects between the other end and ground of the resistance R11.
Third or the 4th embodiment with reference to first aspect, in the 5th embodiment of first aspect, the amplifying unit
Further include: the offset voltage of offset voltage subelement, the offset voltage subelement output inputs the same phase of the amplifier U4A
Input terminal.
5th embodiment with reference to first aspect, in first aspect sixth embodiment, the offset voltage subelement
It include: resistance R12, resistance R13, adjustable resistance RP3 and voltage-stablizer U5；The resistance R12, resistance R13 and adjustable resistance RP3 string
It is connected to after connection between the power supply unit and ground；The voltage output end of the voltage-stablizer U5 and the resistance R12 and the electricity
Hinder the tie point connection of R13；The swing arm of the adjustable resistance RP3 exports the offset voltage.
According to second aspect, the utility model embodiment provides a kind of electronic equipment, and the electronic equipment includes such as the
Soil acidity or alkalinity signal acquisition circuit described in one side or first aspect any embodiment.
Soil acidity or alkalinity signal acquisition circuit and electronic equipment provided by the embodiment of the utility model, pass through differential amplification list
The original detection signal of the two-way that member detects pH sensor carries out differential amplification and gain adjustment for the first time, obtains original detection signal
Amplify to certain multiple；Hereafter, the difference that two-way detects signal is obtained by subtrator, to convert negative voltage signal to
Positive voltage signal；Since difference detection signal is there are still the lesser problem of amplitude, by amplifying unit to difference detect signal into
Row gain adjustment, so that the amplification of soil acidity or alkalinity signal acquisition circuit final output provided by the embodiment of the utility model be made to examine
Surveying signal can adapt to the acquisition range of common single-chip microcontroller, to take and identify solve pH in the prior art by monolithic is machine-readable
The problem of soil acidity or alkalinity signal of sensor detection cannot be read and be identified by processors such as single-chip microcontrollers.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this is practical new
Some embodiments of type for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structure of a specific example of soil acidity or alkalinity signal acquisition circuit provided by the embodiment of the utility model
Schematic diagram；
Fig. 2 is that one of power supply unit in soil acidity or alkalinity signal acquisition circuit provided by the embodiment of the utility model is specific
Exemplary circuit diagram；
Fig. 3 is one of differential amplification unit in soil acidity or alkalinity signal acquisition circuit provided by the embodiment of the utility model
The circuit diagram of specific example；
Fig. 4 is that one of subtrator in soil acidity or alkalinity signal acquisition circuit provided by the embodiment of the utility model is specific
Exemplary circuit diagram；
Fig. 5 is that one of amplifying unit in soil acidity or alkalinity signal acquisition circuit provided by the embodiment of the utility model is specific
Exemplary circuit diagram；
Fig. 6 is one of offset voltage subelement in soil acidity or alkalinity signal acquisition circuit provided by the embodiment of the utility model
The circuit diagram of a specific example；
Fig. 7 is the structural schematic diagram of a specific example of electronic equipment provided by the embodiment of the utility model.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the utility model embodiment.However, it will be clear to one skilled in the art that there is no these
The utility model also may be implemented in the other embodiments of detail.In other situations, omit to well-known system,
The detailed description of apparatus, circuit and method, in case unnecessary details interferes the description of the utility model.
In order to illustrate technical solution described in the utility model, the following is a description of specific embodiments.
The utility model embodiment provides a kind of soil acidity or alkalinity signal acquisition circuit, as shown in Figure 1, the soil acid-base
Spending signal acquisition circuit 100 may include: pH sensor 101, differential amplification unit 102, subtrator 103, amplifying unit 104
With power supply unit 105.Wherein, power supply unit 105 is respectively differential amplification unit 102, subtrator 103 and amplifying unit 104
Power supply.PH sensor 101, differential amplification unit 102, subtrator 103 and amplifying unit 104 are successively linked in sequence, work
Process is as follows:
Differential amplification unit 102 receives the first original original detection letter of detection signal PH- and second of pH sensor output
Number PH+, and differential amplification processing carried out to the first original original detection signal PH+ of detection signal PH- and second, it is corresponding to generate the
One detection signal V_o and the second detection signal V+o.
Subtrator 103 receives the detection signal V+o of first detection signal V_o and second, and to first detection signal V_o and
Second detection signal V+o carries out subtraction process, and setting value detects signal V1_o.
The difference that amplifying unit 104 receives detects signal V1_o, and amplifies processing to difference detection signal V1_o, exports
Amplification detection signal VO_PH.
Soil acidity or alkalinity signal acquisition circuit provided by the embodiment of the utility model is sensed pH by differential amplification unit
The original detection signal of two-way of device detection carries out differential amplification and gain adjustment for the first time, and original detection signal is made to obtain certain multiple
Amplification；Hereafter, the difference that two-way detects signal is obtained by subtrator, to convert positive voltage letter for negative voltage signal
Number；Since there are still the lesser problems of amplitude for difference detection signal, signal is detected to difference by amplifying unit and carries out gain tune
Section, to enable the amplification detection signal of soil acidity or alkalinity signal acquisition circuit final output provided by the embodiment of the utility model
The acquisition range of common single-chip microcontroller is enough adapted to, to be taken and be identified by monolithic is machine-readable, solves pH sensor inspection in the prior art
The problem of soil acidity or alkalinity signal of survey cannot be read and be identified by processors such as single-chip microcontrollers.
It include amplifier in differential amplification unit 102, subtrator 103 and amplifying unit 104.Since amplifier needs
Positive and negative direct current power drives, therefore, in a specific embodiment, as shown in Fig. 2, power supply unit 105 uses voltage-stablizer U1 will
Positive direct-current power conversion is negative DC power supply, thus in differential amplification unit 102, subtrator 103 and amplifying unit 104
Each amplifier provides positive-negative power driving.As shown in Fig. 2, the power input VIN of voltage-stablizer U1 and positive direct-current voltages source VCC
Connection, while positive direct-current voltages source VCC exports the positive direct-current voltages VCC' that can access amplifier through inductance Bd1；Voltage-stablizer U1's
Power output end VOUT exports negative dc voltage-VCC, and negative dc voltage-VCC is exported through inductance Bd2 can access the negative of amplifier
DC voltage-VCC'.In practical applications, MAX660ESA type voltage-stablizer can be selected as the voltage-stablizer U1 in Fig. 2.
In a specific embodiment, as shown in figure 3, differential amplification unit 102 may include resistance R1, resistance R2, electricity
Hinder R3, resistance R4, adjustable resistance RP1, amplifier U2A and amplifier U2B.Specifically, the non-inverting input terminal of amplifier U2A is through electricity
It hinders R1 and receives the first original detection signal PH- that pH sensor 101 exports；The output end of amplifier U2A is through resistance R3 and amplification
The inverting input terminal of device U2A connects；The output end of amplifier U2A exports first detection signal V_o.
The non-inverting input terminal of amplifier U2B receives the second original detection signal PH that pH sensor 101 exports through resistance R2
+；The output end of amplifier U2B is connect through resistance R4 with the inverting input terminal of amplifier U2B；The output end of amplifier U2B exports
Second detection signal V+o.One end of adjustable resistance RP1 and its swing arm are connect with the inverting input terminal of amplifier U2A, adjustable resistance
The other end of RP1 is connect with the inverting input terminal of amplifier U2B.By adjusting adjustable resistance RP1, may be implemented to differential amplification
The gain adjustment of unit 102.
In another specific embodiment, as shown in figure 4, subtrator 103 may include: amplifier U3A, resistance R5,
Resistance R6, resistance R7 and resistance R8.Specifically, the inverting input terminal of amplifier U3A receives differential amplification unit 102 through resistance R5
The first detection signal V_o of output；The output end of amplifier U3A is connect through resistance R7 with the inverting input terminal of amplifier U3A.It puts
The non-inverting input terminal of big device U3A receives the second detection signal V+o that differential amplification unit 102 exports through resistance R6；Amplifier U3A
Non-inverting input terminal be grounded through resistance R8.The second detection signal V+o and first detection signal V_ of output end output of amplifier U3A
The difference of o, i.e. difference detect signal V1_o.
In another specific embodiment, as shown in figure 5, amplifying unit 104 may include: amplifier U4A, resistance R9 and
Adjustable resistance RP2.It is detected specifically, the inverting input terminal of amplifier U4A receives the difference that subtrator 103 exports through resistance R9
Signal V1_o.One end of adjustable resistance RP2 and its swing arm are connect with the inverting input terminal of amplifier U4A, and adjustable resistance RP2's is another
One end is connect with the output end of amplifier U4A.
In order to realize the gain amplification to difference detection signal V1_o, need to be inputted to the non-inverting input terminal of amplifier U4A inclined
Move voltage Offset.In practical applications, offset voltage Offset can be generated by offset voltage subelement shown in fig. 6.
As shown in fig. 6, offset voltage subelement may include: resistance R12, resistance R13, adjustable resistance RP3 and voltage-stablizer U5.Specifically
, resistance R12, resistance R13 and adjustable resistance RP3 series connection after be connected to power supply unit 105 output negative dc voltage-VCC' and
Between ground.The voltage output end of voltage-stablizer U5 is connect with the tie point of resistance R12 and resistance R13.Offset voltage shown in Fig. 6
In subelement, pass through the swing arm output offset voltage Offset of adjustable resistance RP3.In practical applications, it can select
TL431BILP type voltage-stablizer is as the voltage-stablizer U5 in Fig. 6.
Optionally, two-stage capacitance-resistance filter can also be added by the output end of amplifier U4A in amplifying unit 104, thus right
The amplification detection signal VO_PH of the output end output of amplifier U4A is smoothed in amplifying unit 104.Specifically, two-stage
Capacitance-resistance filter may include: resistance R10, resistance R11, capacitor C11 and capacitor C15.One end of resistance R10 is with amplifier U4A's
Output end connection, the other end of resistance R10 are connect with one end of resistance R11, and the other end of resistance R11 exports amplification detection signal
VO_PH.Capacitor C11 is connected between resistance R10 and the tie point and ground of resistance R11, and capacitor C15 is connected to the another of resistance R11
Between one end and ground.
The utility model embodiment additionally provides a kind of electronic equipment, as shown in fig. 7, the electronic equipment 200 includes such as Fig. 1
To soil acidity or alkalinity signal acquisition circuit 100 shown in fig. 6 and its each unit.In electronic equipment 200, soil acidity or alkalinity letter
Number Acquisition Circuit 100 can be used for the processing of the small negative voltage signal of all kinds of pH sensors outputs in electronic equipment 200, will be each
The small negative voltage signal of class pH sensor output is converted into the corresponding positive voltage signal with higher magnitude, such as 0V to 5V
Positive voltage signal, thus enable the pH such as soil acidity or alkalinity detection signal read and identified by common single-chip microcontroller.
Embodiment described above is only to illustrate the technical solution of the utility model, rather than its limitations；Although referring to before
Embodiment is stated the utility model is described in detail, those skilled in the art should understand that: it still can be with
It modifies the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；And
These are modified or replaceed, the spirit for various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution
And range, it should be included within the scope of protection of this utility model.
Claims (8)
1. a kind of soil acidity or alkalinity signal acquisition circuit, including pH sensor, which is characterized in that further include:
The original detection signal of the first original detection signal and second for exporting to the pH sensor carries out at differential amplification
The differential amplification unit of reason；
Two paths of signals for exporting to the differential amplification unit carries out the subtrator of subtraction process；
Signal for exporting to the subtrator amplifies the amplifying unit of processing；
The power supply unit of the respectively described differential amplification unit, subtrator and amplifying unit power supply.
2. soil acidity or alkalinity signal acquisition circuit as described in claim 1, which is characterized in that the differential amplification unit packet
It includes: resistance R1, resistance R2, resistance R3, resistance R4, adjustable resistance RP1, amplifier U2A and amplifier U2B；
The non-inverting input terminal of the amplifier U2A connects the first output end of the pH sensor through the resistance R1, and receives
First original detection signal of the pH sensor output；The output end of the amplifier U2A is put through the resistance R3 with described
The inverting input terminal connection of big device U2A；The output end of the amplifier U2A exports first detection signal；
The non-inverting input terminal of the amplifier U2B connects the second output terminal of the pH sensor through the resistance R2, and receives
Second original detection signal of the pH sensor output；The output end of the amplifier U2B is put through the resistance R4 with described
The inverting input terminal connection of big device U2B；Output end output the second detection signal of the amplifier U2B；
The adjustable resistance RP1 is connected to the inverting input terminal of the amplifier U2A and the inverting input terminal of the amplifier U2B
Between.
3. soil acidity or alkalinity signal acquisition circuit as described in claim 1, which is characterized in that the subtrator includes: to put
Big device U3A, resistance R5, resistance R6, resistance R7 and resistance R8；
The first detection that the inverting input terminal of the amplifier U3A receives the differential amplification unit output through the resistance R5 is believed
Number；The output end of the amplifier U3A is connect through the resistance R7 with the inverting input terminal of the amplifier U3A；
The second detection that the non-inverting input terminal of the amplifier U3A receives the differential amplification unit output through the resistance R6 is believed
Number；The non-inverting input terminal of the amplifier U3A is grounded through the resistance R8；
The output end output difference of the amplifier U3A detects signal.
4. soil acidity or alkalinity signal acquisition circuit as described in claim 1, which is characterized in that the amplifying unit includes: to put
Big device U4A, resistance R9 and adjustable resistance RP2；
The difference that the inverting input terminal of the amplifier U4A receives the subtrator output through the resistance R9 detects signal；
The output end of the amplifier U4A is connect through the adjustable resistance RP2 with the inverting input terminal of the amplifier U4A；
The output end of the amplifier U4A exports amplification detection signal.
5. soil acidity or alkalinity signal acquisition circuit as claimed in claim 4, which is characterized in that the amplifying unit further include:
Resistance R10, resistance R11, capacitor C11 and capacitor C15；
One end of the resistance R10 is connect with the output end of the amplifier U4A, the other end and the electricity of the resistance R10
One end connection of R11 is hindered, the other end of the resistance R11 exports the amplification detection signal；
The capacitor C11 is connected between the resistance R10 and the tie point and ground of resistance R11；The capacitor C15 is connected to institute
It states between the other end and ground of resistance R11.
6. soil acidity or alkalinity signal acquisition circuit as described in claim 4 or 5, which is characterized in that the amplifying unit also wraps
Include: the offset voltage of offset voltage subelement, the offset voltage subelement output inputs the homophase input of the amplifier U4A
End.
7. soil acidity or alkalinity signal acquisition circuit as claimed in claim 6, which is characterized in that the offset voltage subelement packet
It includes: resistance R12, resistance R13, adjustable resistance RP3 and voltage-stablizer U5；
It is connected between the power supply unit and ground after the resistance R12, resistance R13 and adjustable resistance RP3 series connection；The pressure stabilizing
The voltage output end of device U5 is connect with the tie point of the resistance R12 and the resistance R13；
The swing arm of the adjustable resistance RP3 exports the offset voltage.
8. a kind of electronic equipment, which is characterized in that the electronic equipment includes the soil as described in any one of claims 1 to 7
Earth pH value signal acquisition circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822150602.1U CN209218067U (en) | 2018-12-20 | 2018-12-20 | Soil acidity or alkalinity signal acquisition circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822150602.1U CN209218067U (en) | 2018-12-20 | 2018-12-20 | Soil acidity or alkalinity signal acquisition circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN209218067U true CN209218067U (en) | 2019-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822150602.1U Active CN209218067U (en) | 2018-12-20 | 2018-12-20 | Soil acidity or alkalinity signal acquisition circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933350A (en) * | 2021-09-30 | 2022-01-14 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Pulp pH value detection method and device and computer readable storage medium |
-
2018
- 2018-12-20 CN CN201822150602.1U patent/CN209218067U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933350A (en) * | 2021-09-30 | 2022-01-14 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Pulp pH value detection method and device and computer readable storage medium |
| CN113933350B (en) * | 2021-09-30 | 2023-12-22 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Pulp pH value detection method and device and computer readable storage medium |
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