CN102706931A - Biasing and non-biasing operating circuit of electrochemical gas sensor and biasing configuration circuit - Google Patents
Biasing and non-biasing operating circuit of electrochemical gas sensor and biasing configuration circuit Download PDFInfo
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- CN102706931A CN102706931A CN2012101745652A CN201210174565A CN102706931A CN 102706931 A CN102706931 A CN 102706931A CN 2012101745652 A CN2012101745652 A CN 2012101745652A CN 201210174565 A CN201210174565 A CN 201210174565A CN 102706931 A CN102706931 A CN 102706931A
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Abstract
The invention discloses a biasing and non-biasing operating circuit of an electrochemical gas sensor and a biasing configuration circuit, relates to a gas detection technology, and aims to provide a sensor operating circuit which can adapt to a biasing operating mode and a non-biasing operating mode in order to overcome the defects of the prior art. The biasing and non-biasing operating circuit of the electrochemical gas sensor is technically characterized by comprising a sensor power supply circuit, the biasing configuration circuit and a sensor output signal extraction circuit, wherein the sensor output signal extraction circuit is used for receiving and amplifying a current signal which is output by an operating electrode of the electrochemical gas sensor; the biasing configuration circuit is provided with a first voltage output end and a second voltage output end; first voltage is supplied to the sensor power supply circuit; the sensor power supply circuit is used for transmitting the first voltage to a counter electrode of the electrochemical gas sensor; second voltage is supplied to the operating electrode of the electrochemical gas sensor; and the first voltage and the second voltage, which are output by the biasing configuration circuit, can be configured to be equal or unequal.
Description
Technical field
The present invention relates to gas detection technology, particularly a kind of bias voltage of electrochemical gas sensor and non-bias voltage adaptive circuit.
Background technology
In the gas detection industry, be very important some in the industry to the detection of toxic gas.Toxic gas detects mainly to be realized through electrochemical gas sensor, and electrochemical gas sensor has response speed fast, accurately (can be used for the ppm level), good stability, can detection by quantitative, advantage such as favorable repeatability, antijamming capability be strong.
Electrochemical sensor is through coming work with tested gas reacts and generation is directly proportional with gas concentration electric signal.Typical electrochemical sensor is formed by working electrode (or sensing electrode) with to electrode, working electrode and to being separated by a thin electrolyte layers between the electrode.After object gas gets into sensor, with working electrode generation redox reaction, produce electric current, detect said electric current and just can record object gas concentration.For the current potential with working electrode is stabilized in the particular range to guarantee the electrochemical gas sensor operate as normal, people have introduced third electrode, i.e. reference electrode.
The working method of galvanochemistry class gas sensor can be divided into bias voltage working method and non-bias voltage working method.So-called bias voltage working method is meant electrochemical gas sensor during operation, requires working electrode and to keeping certain voltage difference between the electrode, so just can carry out effective detection of object gas concentration; So-called non-bias voltage work is meant the working electrode of electrochemical gas sensor and electrode is not needed voltage difference (current potential equates).In practice, detect characteristics according to different object gas, need design different sensor operating circuit, with the work of assurance sensor normal reliable, thereby effectively detect object gas concentration.
Because in the prior art; Detect characteristics according to different object gas; Need design different sensor operating circuit, for the user, just need to buy at least two cover working sensor circuit, and select the different sensor circuit for use according to the object gas characteristics that detect; So not only increased cost, work efficiency is also low.
Summary of the invention
The objective of the invention is the problem to above-mentioned existence, provide a kind of can adaptive electro chemical gas bias voltage and the sensor circuit and the bias arrangement circuit thereof of non-bias voltage duty.
Electrochemical gas sensor bias voltage among the present invention and non-bias voltage operating circuit are such: comprise that sensor feed circuit, bias arrangement circuit and sensor output signal extract circuit; Sensor feed circuit is used for supplying power to electrochemical gas sensor; Said sensor output signal extracts the current signal that circuit is used to receive and amplify the output of electrochemical gas sensor working electrode; The bias arrangement circuit is used to dispose the mode of electrochemical gas sensor supplies power, and makes it be operated in bias voltage or non-bias voltage working method.
Preferably, said bias arrangement circuit has first voltage output end and second voltage output end;
First voltage output end is used for to sensor feed circuit first voltage being provided; Said sensor feed circuit be used for first voltage transmission give electrochemical gas sensor to electrode;
Second voltage output end is used for to the working electrode of electrochemical gas sensor second voltage being provided; First voltage of configurable its output of said bias arrangement circuit equates with second voltage or does not wait.
Preferably, second voltage output end of said bias arrangement circuit also is used for extracting circuit to said sensor output signal provides initial voltage.
Preferably, said electrochemical gas sensor also comprises reference electrode; Said sensor feed circuit comprises first operational amplifier, first resistance and second resistance; First voltage output end of bias arrangement circuit is connected with the normal phase input end of first operational amplifier through first resistance; One end of second resistance is connected with the inverting input of first operational amplifier, and the other end of second resistance is used to connect the reference electrode of electrochemical gas sensor; The output terminal of said first operational amplifier be used to connect electrochemical gas sensor to electrode.
Preferably, be used in the output terminal of first operational amplifier and second resistance to be connected between the end of electrochemical gas sensor reference electrode and be connected to filter capacitor.
Preferably, said sensor output signal extraction circuit comprises second operational amplifier, the 3rd resistance, the 4th resistance and the 5th resistance; Second voltage output end of said bias arrangement circuit is connected with the normal phase input end of second operational amplifier through the 3rd resistance; One end of said the 4th resistance is connected with the inverting input of second operational amplifier, and the 4th resistance other end is used to connect the working electrode of electrochemical gas sensor; The inverting input of second operational amplifier is connected with the output terminal of second operational amplifier through the 5th resistance.
Preferably, said bias arrangement circuit comprises first divider resistance, second divider resistance and the 3rd divider resistance; First divider resistance, second divider resistance and the 3rd divider resistance are linked in sequence, and the other end of first divider resistance is connected to direct voltage source; The other end ground connection of the 3rd divider resistance; The public linkage section of first divider resistance and second divider resistance is first voltage output end of bias arrangement circuit; The public linkage section of second divider resistance and the 3rd divider resistance is second voltage output end of bias arrangement circuit; The two ends of said second divider resistance are parallel with a switch.
Preferably, said second divider resistance is the adjustable variable resistor of resistance.
The present invention also provides the bias arrangement circuit of electrochemical gas sensor bias voltage and non-bias voltage operating circuit, and it comprises first divider resistance, second divider resistance and the 3rd divider resistance; First divider resistance, second divider resistance and the 3rd divider resistance are linked in sequence, and the other end of first divider resistance is connected to direct voltage source; The other end ground connection of the 3rd divider resistance; The public linkage section of first divider resistance and second divider resistance is first voltage output end of bias arrangement circuit; The public linkage section of second divider resistance and the 3rd divider resistance is second voltage output end of bias arrangement circuit; Said first voltage output end and second voltage output end are used for electrode and working electrode are supplied power to electrochemical gas sensor; The two ends of said second divider resistance are parallel with a switch.
Preferably, said second divider resistance is the adjustable variable resistor of resistance.
In sum, owing to adopted technique scheme, the invention has the beneficial effects as follows:
1, the present invention can compatible electrochemical gas sensor bias voltage and non-bias voltage working method only need can satisfy once the cover sensor circuit detection requirement of different target gas, simplify product design and production greatly, provide cost savings.
2, can be bias voltage or non-bias voltage working method with sensor circuit configuration through said switch; Through adjusting the second divider resistance resistance so that the bias voltage that adapts with electrochemical gas sensor to be provided, the way the present invention who changes sensor circuit with respect to prior art has effectively improved work efficiency under the bias voltage working method.
Description of drawings
The present invention will explain through example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is a schematic block circuit diagram of the present invention.
Fig. 2 is the circuit theory diagrams of a specific embodiment of the present invention.
Embodiment
Disclosed all characteristics in this instructions, or the step in disclosed all methods or the process except mutually exclusive characteristic and/or the step, all can make up by any way.
Disclosed arbitrary characteristic in this instructions (comprising any accessory claim, summary and accompanying drawing) is only if special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, only if special narration, each characteristic is an example in a series of equivalences or the similar characteristics.
As shown in Figure 1, electrochemical gas sensor bias voltage among the present invention and non-bias voltage operating circuit comprise that sensor feed circuit, sensor output signal extract circuit and bias arrangement circuit.Wherein sensor output signal extracts the current signal that circuit is used to receive and amplify the output of electrochemical gas sensor working electrode, and the bias arrangement circuit is used to control the power supply of electrochemical gas sensor, makes it be operated in bias voltage or non-bias voltage working method.
Like Fig. 2, a specific embodiment of the present invention is: present embodiment comprises that sensor feed circuit, sensor output signal extract circuit and bias arrangement circuit.Said electrochemical gas sensor is a three-electrode structure, comprises working electrode 2, to electrode 1 and reference electrode 3.
Sensor output signal extracts circuit and is used to receive the current signal of working electrode 2 outputs and it is amplified back output.
Said bias arrangement circuit has the first voltage VS1 output terminal and the second voltage VS2 output terminal.The first voltage VS1 output terminal is used for to sensor feed circuit the first voltage VS1 being provided; Said sensor feed circuit be used for the first voltage VS1 be transferred to electrochemical gas sensor to electrode 1, for electrochemical gas sensor provides constant WV.The second voltage VS2 output terminal is used for to the working electrode 2 of electrochemical gas sensor the second voltage VS2 being provided.The second voltage VS2 output terminal of said bias arrangement circuit also is used for extracting circuit to said sensor output signal provides initial voltage, and when the electrochemical gas sensor non-output signal, sensor output signal extracts circuit and exports an initial value.
The first voltage VS1 of configurable its output of said bias arrangement circuit equates with the second voltage VS2 or does not wait.
Concrete, said sensor feed circuit comprises operational amplifier U3A, resistance R 13 and resistance R 12; The first voltage VS1 output terminal of bias arrangement circuit is connected with the normal phase input end of operational amplifier U3A through resistance R 13; One end of resistance R 12 is connected with the inverting input of operational amplifier U3A, and the other end of resistance R 12 is used to connect the reference electrode 3 of electrochemical gas sensor; The output terminal of said operational amplifier U3A be used to connect electrochemical gas sensor to electrode 1.
For the stable electrical sensor of chemical gas to the current potential on the electrode; Can in the output terminal of operational amplifier U3A and resistance R 12, be used to be connected between the end of reference electrode 3 of electrochemical gas sensor and insert filter capacitor C3, that is to say access filter capacitor C3 between the reference electrode 3 of the output terminal of operational amplifier U3A and electrochemical gas sensor.
Said sensor output signal extracts circuit and comprises operational amplifier U3B, resistance R 14, resistance R 16 and resistance R 18; The second voltage VS2 output terminal of said bias arrangement circuit is connected with the normal phase input end of operational amplifier U3B through resistance R 18; One end of said resistance R 16 is connected with the inverting input of operational amplifier U3B, and resistance R 16 other ends are used to connect the working electrode 2 of electrochemical gas sensor; The inverting input of operational amplifier U3B is connected with the output terminal of operational amplifier U3B through resistance R 14.The gas response current of electrochemical gas sensor; Be that object gas is at the electric current that takes place on the working electrode to export after the redox reaction; The resistance R of flowing through 16, resistance R 14, thus the voltage signal that is directly proportional with electric current on resistance R 14, obtained, export as the gas response signal.
Said bias arrangement circuit comprises divider resistance R15, divider resistance R17 and divider resistance R19; Divider resistance R15, divider resistance R17 and divider resistance R19 are linked in sequence, and wherein, the termination that divider resistance R15 does not connect divider resistance R17 has direct voltage source; Divider resistance R19 does not connect the end ground connection of divider resistance R17; The public linkage section of divider resistance R15 and divider resistance R17 is the first voltage VS1 output terminal of bias arrangement circuit; The public linkage section of divider resistance R17 and divider resistance R19 is the second voltage VS2 output terminal of bias arrangement circuit.
In the present embodiment, resistance R 17 can be described as bias resistance again, and the potential difference (PD) at its two ends (VS1-VS2) provide bias voltage for electrochemical gas sensor.
When electrochemical gas sensor is operated in bias mode; Resistance R 15, resistance R 17 and resistance R 19 mutual group become bleeder circuit; Obtain voltage VS1>VS2, wherein VS2 is that the working electrode 2 of electrochemical gas sensor provides WV, for sensor output signal extracts circuit initial voltage is provided simultaneously; Be that the output voltage that sensor output signal extracts circuit was VS2 when object gas was zero in the environment.VS1 is that electrochemical gas sensor provides WV to electrode, i.e. sensor supply voltage, in the present embodiment through sensor feed circuit export to electrochemical sensor to electrode 1.Because the dividing potential drop effect of resistance R 17, make VS1>VS2, make sensor be higher than working electrode voltage to electrode voltage; Form bias voltage (VS1-VS2); Wherein the value of VS1/VS2 according to sensor self parameter, is obtained by divider resistance R15, resistance R 17 and resistance R 19 configurations.Concrete can be designed to adjustable variable resistor of resistance or pot with resistance R 17, changes the value of (VS1-VS2) through the resistance of adjustment R17, thereby suitable bias voltage is provided for electrochemical gas sensor.
When electrochemical gas sensor is operated in non-bias mode, VS1=VS2, the working electrode of electrochemical sensor and equal to the electrode voltage value.Make VS1=VS2, can use a lead with resistance R 17 short circuits, be about to lead and be connected in parallel on resistance R 17 two ends, perhaps with the two ends of a switch in parallel in resistance R 17, during switch closure, VS1=VS2, electrochemical gas sensor are operated under the non-bias voltage working method; When switch broke off, electrochemical gas sensor was operated under the bias voltage working method.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (10)
1. an electrochemical gas sensor bias voltage and non-bias voltage operating circuit comprise that sensor feed circuit and sensor output signal extract circuit; Sensor feed circuit is used for supplying power to electrochemical gas sensor; Said sensor output signal extracts the current signal that circuit is used to receive and amplify the output of electrochemical gas sensor working electrode;
It is characterized in that,
Also comprise the bias arrangement circuit; The bias arrangement circuit is used to dispose the power supply mode of electrochemical gas sensor, makes it be operated in bias voltage or non-bias voltage working method.
2. a kind of electrochemical gas sensor bias voltage according to claim 1 and non-bias voltage operating circuit is characterized in that said bias arrangement circuit has first voltage output end and second voltage output end;
First voltage output end is used for to sensor feed circuit first voltage being provided; Said sensor feed circuit be used for first voltage transmission give electrochemical gas sensor to electrode;
Second voltage output end is used for to the working electrode of electrochemical gas sensor second voltage being provided; First voltage of configurable its output of said bias arrangement circuit equates with second voltage or does not wait.
3. a kind of electrochemical gas sensor bias voltage according to claim 2 and non-bias voltage operating circuit is characterized in that, second voltage output end of said bias arrangement circuit also is used for extracting circuit to said sensor output signal provides initial voltage.
4. a kind of electrochemical gas sensor bias voltage according to claim 3 and non-bias voltage operating circuit is characterized in that said electrochemical gas sensor also comprises reference electrode; Said sensor feed circuit comprises first operational amplifier, first resistance and second resistance; First voltage output end of bias arrangement circuit is connected with the normal phase input end of first operational amplifier through first resistance; One end of second resistance is connected with the inverting input of first operational amplifier, and the other end of second resistance is used to connect the reference electrode of electrochemical gas sensor; The output terminal of said first operational amplifier be used to connect electrochemical gas sensor to electrode.
5. a kind of electrochemical gas sensor bias voltage according to claim 4 and non-bias voltage operating circuit; It is characterized in that, be used in the output terminal of first operational amplifier and second resistance to be connected between the end of electrochemical gas sensor reference electrode and be connected to filter capacitor.
6. a kind of electrochemical gas sensor bias voltage according to claim 5 and non-bias voltage operating circuit is characterized in that, said sensor output signal extracts circuit and comprises second operational amplifier, the 3rd resistance, the 4th resistance and the 5th resistance; Second voltage output end of said bias arrangement circuit is connected with the normal phase input end of second operational amplifier through the 3rd resistance; One end of said the 4th resistance is connected with the inverting input of second operational amplifier, and the 4th resistance other end is used to connect the working electrode of electrochemical gas sensor; The inverting input of second operational amplifier is connected with the output terminal of second operational amplifier through the 5th resistance.
7. a kind of electrochemical gas sensor bias voltage according to claim 6 and non-bias voltage operating circuit is characterized in that said bias arrangement circuit comprises first divider resistance, second divider resistance and the 3rd divider resistance; First divider resistance, second divider resistance and the 3rd divider resistance are linked in sequence, and the other end of first divider resistance is connected to direct voltage source; The other end ground connection of the 3rd divider resistance; The public linkage section of first divider resistance and second divider resistance is first voltage output end of bias arrangement circuit; The public linkage section of second divider resistance and the 3rd divider resistance is second voltage output end of bias arrangement circuit; The two ends of said second divider resistance are parallel with a switch.
8. a kind of electrochemical gas sensor bias voltage according to claim 7 and non-bias voltage operating circuit is characterized in that, said second divider resistance is the adjustable variable resistor of resistance.
9. the bias arrangement circuit of an electrochemical gas sensor bias voltage and non-bias voltage operating circuit is characterized in that, comprises first divider resistance, second divider resistance and the 3rd divider resistance; First divider resistance, second divider resistance and the 3rd divider resistance are linked in sequence, and the other end of first divider resistance is connected to direct voltage source; The other end ground connection of the 3rd divider resistance; The public linkage section of first divider resistance and second divider resistance is first voltage output end of bias arrangement circuit; The public linkage section of second divider resistance and the 3rd divider resistance is second voltage output end of bias arrangement circuit; Said first voltage output end and second voltage output end are used for electrode and working electrode are supplied power to electrochemical gas sensor; The two ends of said second divider resistance are parallel with a switch.
10. the bias arrangement circuit of a kind of electrochemical gas sensor bias voltage according to claim 9 and non-bias voltage operating circuit is characterized in that, said second divider resistance is the adjustable variable resistor of resistance.
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| CN109187672A (en) * | 2018-10-23 | 2019-01-11 | 成都安可信电子股份有限公司 | A kind of electrochemical sensor test macro and test method |
| WO2022000313A1 (en) * | 2020-06-30 | 2022-01-06 | 浙江大学 | Constant potential circuit, blood glucose measurement circuit, and device |
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| CN102706931B (en) | 2014-07-09 |
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