CN209446661U - Electrochemical sensor signal acquisition circuit and electronic equipment - Google Patents
Electrochemical sensor signal acquisition circuit and electronic equipment Download PDFInfo
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- CN209446661U CN209446661U CN201822149273.9U CN201822149273U CN209446661U CN 209446661 U CN209446661 U CN 209446661U CN 201822149273 U CN201822149273 U CN 201822149273U CN 209446661 U CN209446661 U CN 209446661U
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- detection signal
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Abstract
The utility model is suitable for field of circuit technology, provides a kind of electrochemical sensor signal acquisition circuit and electronic equipment, wherein above-mentioned electrochemical sensor signal acquisition circuit includes: constant potential unit, the first amplifying unit and power supply unit；Power supply unit is respectively constant potential unit and the power supply of the first amplifying unit；Electrochemical sensor receives the reference potential signal that constant potential unit generates, and exports original detection signal；First amplifying unit receives original detection signal, and amplifies processing to original detection signal, exports the first amplification detection signal.Electrochemical sensor signal acquisition circuit and electronic equipment provided by the embodiment of the utility model export stable voltage signal by constant potential unit to make electrochemical sensor be able to maintain steady operation.In addition, certain multiple amplification is obtained by the original detection signal that the first amplifying unit exports electrochemical sensor, so that the amplification detection signal of final output be enable 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 electrochemical sensor signal acquisition circuit and electronics
Equipment.
Background technique
Common electrochemical sensor can directly use and export detection signal, but the electrochemical sensor of some models
It is provided with reference electrode, reference electrode needs to access constant potential.If reference electrode cannot stablize reception constant potential, meeting
The detection of electrochemical sensor is impacted, to introduce noise or fluctuation in the detection signal of its output.In addition, common
The output signal of electrochemical sensor is generally the voltage signal of amplitude very little.Since common single-chip microcontroller can not directly read amplitude
Small voltage signal, it would therefore be highly desirable to which the small voltage signal for developing a kind of pair of electrochemical sensor output carries out proper treatment
Circuit, thus enable electrochemical sensor export detection signal by the processors such as single-chip microcontroller read and identify.
Utility model content
In view of this, the utility model embodiment provides a kind of electrochemical sensor signal acquisition circuit and electronics is set
It is standby, output detection signal cannot be stablized to solve the electrochemical sensor with reference electrode in the prior art, and it is exported
Detection signal cannot by the processors such as single-chip microcontroller read and identify the problem of.
According in a first aspect, the utility model embodiment provides a kind of electrochemical sensor signal acquisition circuit, comprising:
For generating the constant potential unit of reference potential signal for electrochemical sensor；For the output signal to electrochemical sensor into
First amplifying unit of row enhanced processing；For the power supply list for the constant potential unit and first amplifying unit power supply
Member.
With reference to first aspect, in first aspect first embodiment, the constant potential unit include: field-effect tube Q1,
Resistance R1, resistance R2, resistance R3, capacitor C6 and amplifier U2；The drain electrode of the field-effect tube Q1 and the electrochemical sensor
Reference electrode connection, the source electrode of the field-effect tube Q1 connect with the working electrode of the electrochemical sensor, and the field is imitated
Should the grid of pipe Q1 connect with the power supply unit；The electrochemistry is connected to after the resistance R1 and resistance R2 series connection to pass
Between the reference electrode of sensor and the inverting input terminal of the amplifier U2, the output end of the amplifier U2 is through the capacitor C6
It is connect with the tie point of the resistance R1 and the resistance R2；The resistance R3 is connected to the non-inverting input terminal of the amplifier U2
Between ground.
With reference to first aspect, in first aspect second embodiment, first amplifying unit includes: resistance R4, electricity
Hinder R5, adjustable resistance RP1 and amplifier U3；The inverting input terminal of the amplifier U3 is passed through the resistance R4 and the electrochemistry
The working electrode of sensor connects, to receive the original detection signal of the electrochemical sensor output；The amplifier U3's is same
Phase input terminal is connected to ground through the resistance R5；The output end of the amplifier U3 is through the adjustable resistance RP1 and the amplification
The inverting input terminal of device U3 connects, and the output end of the amplifier U3 exports the first amplification detection signal.
Second embodiment with reference to first aspect, in first aspect third embodiment, first amplifying unit is also
It include: resistance R6, resistance R7, capacitor C12 and capacitor C13；The output end of one end of the resistance R6 and the amplifier U3 connect
It connects, the other end of the resistance R6 is connect with one end of the resistance R7, and the other end output described first of the resistance R7 is put
Big detection signal；The capacitor C12 is connected between the resistance R6 and the tie point and ground of resistance R7；The capacitor C13 connects
It connects between the other end and ground of the resistance R7.
With reference to first aspect or any embodiment of the first aspect first into third, in the 4th embodiment party of first aspect
In formula, the electrochemical sensor signal acquisition circuit further include: the second amplifying unit；Described in second amplifying unit receives
First amplification detection signal, and processing is amplified to the first amplification detection signal, export the second amplification detection signal.
4th embodiment with reference to first aspect, in the 5th embodiment of first aspect, the second amplifying unit packet
It includes: resistance R8, resistance R9 and amplifier U4；The non-inverting input terminal of the amplifier U4 receives the first amplifying unit output
The inverting input terminal of first amplification detection signal, the amplifier U4 is grounded through the resistance R8, the output of the amplifier U4
End is connect through the resistance R9 with the inverting input terminal of the amplifier U4；The output end output described second of the amplifier U4
Amplification detection signal.
5th embodiment with reference to first aspect, in first aspect sixth embodiment, second amplifying unit is also
It include: resistance R10, resistance R11, capacitor C14 and capacitor C15；The output end of one end of the resistance R10 and the amplifier U4
Connection, the other end of the resistance R10 connect with one end of the resistance R11, and the other end of the resistance R11 exports described the
Two amplification detection signals；The capacitor C14 is connected between the resistance R10 and the tie point and ground of resistance R11；The capacitor
C15 is connected between the other end and ground of the resistance R11.
According to second aspect, the utility model embodiment provides a kind of electronic equipment, and the electronic equipment includes such as the
Electrochemical sensor signal acquisition circuit described in one side or first aspect any embodiment.
Electrochemical sensor signal acquisition circuit and electronic equipment provided by the embodiment of the utility model, pass through constant potential list
Member exports stable voltage signal and the voltage signal is accessed electrochemical sensor, so that electrochemical sensor be made to be able to maintain
Steady operation avoids introducing noise or fluctuation in the detection signal of its output.In addition, passing through the first amplifying unit for electrochemistry
The original detection signal of sensor output amplifies and gain adjustment, and original detection signal is made to obtain certain multiple amplification, from
And enable the amplification detection signal of electrochemical sensor signal acquisition circuit final output provided by the embodiment of the utility model
The acquisition range of common single-chip microcontroller is adapted to, to take and identify solve electrochemical sensor in the prior art by monolithic is machine-readable
Detection signal cannot by the processors such as single-chip microcontroller read and identify the problem of.
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 knot of a specific example of electrochemical sensor signal acquisition circuit provided by the embodiment of the utility model
Structure schematic diagram；
Fig. 2 is a tool of power supply unit in electrochemical sensor signal acquisition circuit provided by the embodiment of the utility model
The exemplary circuit diagram of body；
Fig. 3 is one of constant potential unit in electrochemical sensor signal acquisition circuit provided by the embodiment of the utility model
The circuit diagram of specific example；
Fig. 4 is one of the first amplifying unit in electrochemical sensor signal acquisition circuit provided by the embodiment of the utility model
The circuit diagram of a specific example；
Fig. 5 is one of the second amplifying unit in electrochemical sensor signal acquisition circuit provided by the embodiment of the utility model
The circuit diagram of a specific example；
Fig. 6 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 electrochemical sensor signal acquisition circuit, as shown in Figure 1, the electrochemistry
Collecting sensor signal circuit 100 may include: constant potential unit 101, the first amplifying unit 102 and power supply unit 103.Its
In, power supply unit 103 is respectively constant potential unit 101 and the power supply of the first amplifying unit 102.Electrochemical sensor P, constant potential list
Member 101 and the first amplifying unit 102 are successively linked in sequence, and the course of work is as follows:
The reference electrode R of electrochemical sensor P receives the reference potential signal that constant potential unit 101 generates, and passes through it
Working electrode W exports original detection signal.First amplifying unit 102 receives original detection signal, and to original detection signal into
Row enhanced processing exports the first amplification detection signal Vo1.
Electrochemical sensor signal acquisition circuit provided by the embodiment of the utility model is exported by constant potential unit and is stablized
Voltage signal and the voltage signal is accessed into electrochemical sensor, so that electrochemical sensor be made to be able to maintain steady operation,
It avoids introducing noise or fluctuation in the detection signal of its output.In addition, by the first amplifying unit that electrochemical sensor is defeated
Original detection signal out amplifies and gain adjustment, so that original detection signal is obtained certain multiple amplification, to make this reality
The amplification detection signal of the electrochemical sensor signal acquisition circuit final output provided with new embodiment can adapt to commonly
The acquisition range of single-chip microcontroller solves the detection letter of electrochemical sensor in the prior art to be taken and be identified by monolithic is machine-readable
Number cannot by the processors such as single-chip microcontroller read and identify the problem of.
It include amplifier in constant potential unit 101 and the first amplifying unit 102.Since amplifier needs positive and negative direct current electric
Source driving, therefore, in a specific embodiment, as shown in Fig. 2, power supply unit 103 uses voltage-stablizer U1 by positive direct-current power supply
The DC power supply that is negative is converted, to provide positive negative electricity for each amplifier in constant potential unit 101 and the first amplifying unit 102
Source driving.As shown in Fig. 2, the power input VIN of voltage-stablizer U1 is connect with positive direct-current voltages source VCC, the power supply of voltage-stablizer U1
Output end VOUT exports negative dc voltage-VCC.In practical applications, MAX660ESA type voltage-stablizer can be selected as in Fig. 2
Voltage-stablizer U1.
In a specific embodiment, as shown in figure 3, constant potential unit 101 may include: field-effect tube Q1, resistance R1,
Resistance R2, resistance R3, capacitor C6 and amplifier U2.Specifically, the drain electrode of field-effect tube Q1 and the reference of electrochemical sensor P electricity
Pole R connection, the source electrode of field-effect tube Q1 are connect with the working electrode W of electrochemical sensor P, the grid and power supply of field-effect tube Q1
VCC connection in positive direct-current voltages source in unit.The reference electrode R of electrochemical sensor P is connected to after resistance R1 and resistance R2 series connection
Between the inverting input terminal of amplifier U2, the output end of amplifier U2 connects through the tie point of capacitor C6 and resistance R1 and resistance R2
It connects.Resistance R3 is connected between the non-inverting input terminal and ground of amplifier U2.
In another specific embodiment, as shown in figure 4, the first amplifying unit 102 may include: resistance R4, resistance R5,
Adjustable resistance RP1 and amplifier U3.Specifically, work of the inverting input terminal of amplifier U3 through resistance R4 Yu electrochemical sensor P
Make electrode W connection, to receive the original detection signal of electrochemical sensor P output.The non-inverting input terminal of amplifier U3 is through resistance
R5 is connected to ground.The output end of amplifier U3 is connect with one end of adjustable resistance RP1, the other end of adjustable resistance RP1 and its dynamic
Arm is connect with the inverting input terminal of amplifier U3.The output end of amplifier U3 exports the first amplification detection signal Vo1.
Optionally, two-stage capacitance-resistance filter can also be added by the output end of amplifier U3 in the first amplifying unit 102, thus
First amplification detection signal Vo1 of the output end output of amplifier U3 in the first amplifying unit 102 is smoothed.Specifically
, two-stage capacitance-resistance filter may include: resistance R6, resistance R7, capacitor C12 and capacitor C13.Specifically, one end of resistance R6 with
The output end of amplifier U3 connects, and the other end of resistance R6 is connect with one end of resistance R7, the other end output smoothing of resistance R7
Treated the first amplification detection signal Vo1.Capacitor C12 is connected between resistance R6 and the tie point and ground of resistance R7, capacitor
C13 is connected between the other end and ground of resistance R7.
In practical applications, an enhanced processing only is carried out to the original detection signal of electrochemical sensor P output, it cannot
Reach the signal acquisition range of common single-chip microcontroller.For this purpose, can also be in the electrochemistry that the utility model embodiment also provides
The second amplifying unit is added in collecting sensor signal circuit.Second amplifying unit receives the first amplification detection signal Vo1, and right
First amplification detection signal Vo1 amplifies processing, exports the second amplification detection signal Vo2.
In a specific embodiment, as shown in figure 5, the second amplifying unit may include: resistance R8, resistance R9 and amplification
Device U4.Specifically, the non-inverting input terminal of amplifier U4 receives the first amplification detection signal Vo1 of the first amplifying unit 102 output.
The inverting input terminal of amplifier U4 is grounded through resistance R8, anti-phase input of the output end of amplifier U4 through resistance R9 Yu amplifier U4
End connection.The output end of amplifier U4 exports the second amplification detection signal Vo2.For the amplifier U4 in the second amplifying unit,
The negative dc voltage-that the positive direct-current voltages source VCC and power supply unit 103 that can equally access in power supply unit 103 are exported
VCC。
Optionally, another two-stage capacitance-resistance filter can also be added by the output end of amplifier U4 in the second amplifying unit, from
And the second amplification detection signal Vo2 of the output end output of amplifier U4 in the second amplifying unit is smoothed.Specifically
, which may include: resistance R10, resistance R11, capacitor C14 and capacitor C15, specifically, the one of resistance R10
End is connect with the output end of amplifier U4, and the other end of resistance R10 is connect with one end of resistance R11, and the other end of resistance R11 is defeated
The second amplification detection signal Vo2 after smoothing processing out.Capacitor C14 is connected to the tie point and ground of resistance R10 and resistance R11
Between, capacitor C15 is connected between the other end and ground of resistance R11.
The utility model embodiment additionally provides a kind of electronic equipment, as shown in fig. 6, the electronic equipment 200 includes such as Fig. 1
To electrochemical sensor signal acquisition circuit 100 shown in fig. 5 and its each unit.In electronic equipment 200, electrochemical sensing
Device signal acquisition circuit 100 can provide constant voltage signal for all kinds of electrochemical sensors in electronic equipment 200, and set to electronics
The small voltage signal of all kinds of electrochemical sensor outputs is handled in standby 200, is translated into corresponding with larger amplitude
The voltage signal of value, such as the voltage signal of 0V to 5V, thus all kinds of chemical gas for detecting electrochemical sensor or change
The detection signal for learning liquid can be read and be 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 electrochemical sensor signal acquisition circuit characterized by comprising
For generating the constant potential unit of reference potential signal for electrochemical sensor；
The first amplifying unit of processing is amplified for the output signal to electrochemical sensor；
For the power supply unit for the constant potential unit and first amplifying unit power supply.
2. electrochemical sensor signal acquisition circuit as described in claim 1, which is characterized in that the constant potential unit packet
It includes: field-effect tube Q1, resistance R1, resistance R2, resistance R3, capacitor C6 and amplifier U2；
The drain electrode of the field-effect tube Q1 is connect with the reference electrode of the electrochemical sensor, the source electrode of the field-effect tube Q1
It is connect with the working electrode of the electrochemical sensor, the grid of the field-effect tube Q1 is connect with the power supply unit；
The reference electrode and the amplifier of the electrochemical sensor are connected to after the resistance R1 and resistance R2 series connection
Between the inverting input terminal of U2, the output end of the amplifier U2 is through the capacitor C6's and resistance R1 and resistance R2
Tie point connection；
The resistance R3 is connected between the non-inverting input terminal and ground of the amplifier U2.
3. electrochemical sensor signal acquisition circuit as described in claim 1, which is characterized in that the first amplifying unit packet
It includes: resistance R4, resistance R5, adjustable resistance RP1 and amplifier U3；
The inverting input terminal of the amplifier U3 is connect through the resistance R4 with the working electrode of the electrochemical sensor, to connect
Receive the original detection signal of the electrochemical sensor output；
The non-inverting input terminal of the amplifier U3 is connected to ground through the resistance R5；
The output end of the amplifier U3 is connect through the adjustable resistance RP1 with the inverting input terminal of the amplifier U3, described
The output end of amplifier U3 exports the first amplification detection signal.
4. electrochemical sensor signal acquisition circuit as claimed in claim 3, which is characterized in that first amplifying unit is also
It include: resistance R6, resistance R7, capacitor C12 and capacitor C13；
One end of the resistance R6 is connect with the output end of the amplifier U3, the other end of the resistance R6 and the resistance R7
One end connection, the other end of the resistance R7 exports the first amplification detection signal；
The capacitor C12 is connected between the resistance R6 and the tie point and ground of resistance R7；The capacitor C13 is connected to described
Between the other end and ground of resistance R7.
5. electrochemical sensor signal acquisition circuit according to any one of claims 1 to 4, which is characterized in that the electricity
Chemical sensor signal acquisition circuit further include: the second amplifying unit；
Second amplifying unit receives the first amplification detection signal of the first amplifying unit output, and puts to described first
Big detection signal amplifies processing, exports the second amplification detection signal.
6. electrochemical sensor signal acquisition circuit as claimed in claim 5, which is characterized in that the second amplifying unit packet
It includes: resistance R8, resistance R9 and amplifier U4；
The non-inverting input terminal of the amplifier U4 receives the first amplification detection signal of the first amplifying unit output, described to put
The inverting input terminal of big device U4 is grounded through the resistance R8, and the output end of the amplifier U4 is through the resistance R9 and the amplification
The inverting input terminal of device U4 connects；
The output end of the amplifier U4 exports the second amplification detection signal.
7. electrochemical sensor signal acquisition circuit as claimed in claim 6, which is characterized in that second amplifying unit is also
It include: resistance R10, resistance R11, capacitor C14 and capacitor C15；
One end of the resistance R10 is connect with the output end of the amplifier U4, the other end and the resistance of the resistance R10
One end of R11 connects, and the other end of the resistance R11 exports the second amplification detection signal；
The capacitor C14 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.
8. a kind of electronic equipment, which is characterized in that the electronic equipment includes the electricity as described in any one of claims 1 to 7
Chemical sensor signal acquisition circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822149273.9U CN209446661U (en) | 2018-12-20 | 2018-12-20 | Electrochemical sensor signal acquisition circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822149273.9U CN209446661U (en) | 2018-12-20 | 2018-12-20 | Electrochemical sensor signal acquisition circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209446661U true CN209446661U (en) | 2019-09-27 |
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ID=68014622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822149273.9U Active CN209446661U (en) | 2018-12-20 | 2018-12-20 | Electrochemical sensor signal acquisition circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209446661U (en) |
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2018
- 2018-12-20 CN CN201822149273.9U patent/CN209446661U/en active Active
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