CN202903724U - Circuit for automatic zero calibration of sensor - Google Patents
Circuit for automatic zero calibration of sensor Download PDFInfo
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- CN202903724U CN202903724U CN 201220373110 CN201220373110U CN202903724U CN 202903724 U CN202903724 U CN 202903724U CN 201220373110 CN201220373110 CN 201220373110 CN 201220373110 U CN201220373110 U CN 201220373110U CN 202903724 U CN202903724 U CN 202903724U
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Abstract
The utility model discloses a circuit for automatic zero calibration of a sensor. The circuit comprises a detector, a compensator, two resistors, a voltage output circuit and a controller, wherein the detector, the compensator, the first resistor and the second resistor constitute a single-arm bridge after being electrically connected; one end of the controller is connected with a common electric connection end of the detector and the compensator, and the other end of the controller is connected with a common electric connection end of the first resistor and the second resistor; the controller is used to detect an output voltage of the single-arm bridge and determine whether the output voltage is normal, and generate a control signal according to the output voltage and send the control signal if the output voltage is abnormal; one end of the voltage output circuit is electrically connected with the controller, and the other end of the voltage output circuit is connected with the common electric connection end of the first resistor and the second resistor; and the voltage output circuit is used to receive the control signal sent by the controller and output a voltage for adjusting the output voltage of the single-arm bridge to be zero according to the control signal. The circuit can automatically perform zero calibration on the sensor, and achieves the aim that the sensor detects an accurate gas concentration.
Description
Technical field
The utility model relates to the gas sensor technical field, more particularly, relates to a kind of circuit to the sensor automatic zero point correcting.
Background technology
What at present, the detection of gas concentration is mainly adopted is gas sensor.Existing gas concentration testing circuit mainly also claims to deceive sensor that element, compensator 12 also claim white element to consist of, two external balance resistance R1 and R2, adjustable resistance R3 by detecting device 11 and forms as shown in Figure 1.
In the process that gas sensor detects gas concentration, black-and-white component is uneven owing to existing, the variation of the temperature of gas sensor working environment, humidity, pressure, gas sensor service time is long and gas sensor in the reason such as catalyst consumption, cause easily drift about the zero point of gas sensor, when zero point of sensor occurs with in the same way drift of gas reaction, output voltage values when not having tested gas around can causing causes false alarm; When zero point of sensor occured with the reverse drift of gas reaction, can cause output voltage values was negative value, and output valve can not reacting gas concentration when tested gas being arranged on every side, makes sensor function lose efficacy initiation potential; Therefore when working, cause false alarm or disabler because of zero point drift for fear of gas sensor, need to be by regulating adjustable resistance R3 to calibrating the zero point of sensor.
But existing adjusting adjustable resistance R3 mainly is that intelligent degree is low by the artificial adjusting adjustable resistance R3 of magnitude of voltage of observation output terminal to calibrating the zero point of sensor, and calibrate the zero point to sensor that can not be real-time.
The utility model content
In view of this, the utility model provides a kind of circuit to the sensor automatic zero point correcting, with realize can be automatically to calibrating the zero point of sensor, and then realization makes sensor detect accurately gas concentration.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of circuit to the sensor automatic zero point correcting comprises: detecting device, compensator, the first resistance, the second resistance, voltage follower circuit and controller; Wherein:
After being electrically connected, described detecting device, compensator, the first resistance and the second resistance forms wheatstone bridge;
Described controller one end links to each other with the common electrical link of described detecting device and compensator, the other end links to each other with the common electrical link of described the first resistance and the second resistance, output voltage for detection of described wheatstone bridge, and judge whether described output voltage is normal, if undesired then according to described output voltage generation control signal, and send described control signal;
Described voltage follower circuit one end is electrically connected with described controller, the other end and described the first resistance be connected the common electrical link of resistance and be connected, be used for receiving the described control signal that described controller sends, and be zero voltage according to the described wheatstone bridge output voltage of described control signal output adjusting.
Preferably, described controller comprises: detecting unit, judging unit, control signal generation unit and transmitting element; Wherein:
Described detecting unit links to each other with described judging unit, for detection of the output voltage of described wheatstone bridge;
Described judging unit links to each other with described control signal generation unit, is used for judging whether described output voltage is fixed value or negative value within a certain period of time;
Described control signal generation unit links to each other with described transmitting element, is used for generating control signal when the described output voltage of described judgment unit judges is fixed value or negative value within a certain period of time;
Described transmitting element links to each other with described voltage follower circuit, is used for described control signal is sent to described voltage follower circuit.
Can find out from above-mentioned technical scheme, the sensor of the disclosed a kind of automatic zero point correcting of the utility model and method, by controller the wheatstone bridge output voltage is detected in real time, and judge whether the output voltage that detects is normal, when output voltage is undesired, generate control signal, it is zero voltage that the wheatstone bridge output voltage is regulated in the output of control voltage follower circuit, realizes when the zero point of sensor, drift occured sensor being carried out automatic zero point correcting; In the zero point correction process of the sensor, can automatically finish by controller, need not artificial participation, so that the zero point correction of sensor is more real-time, convenient, fast and accurate.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the disclosed gas concentration testing circuit of prior art figure;
Fig. 2 is the disclosed a kind of circuit diagram to the sensor automatic zero point correcting of the utility model embodiment;
Fig. 3 is the structural representation of the disclosed controller of another embodiment of the utility model.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present utility model, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiment discloses a kind of circuit to the sensor automatic zero point correcting, with realize can be automatically to calibrating the zero point of sensor, and then realization makes sensor detect accurately gas concentration.
As shown in Figure 2, the disclosed a kind of circuit to the sensor automatic zero point correcting of embodiment comprises: detecting device 21, compensator 22, the first resistance 23, the second resistance 24, voltage follower circuit 25 and controller 26; Wherein:
After being electrically connected, detecting device 21, compensator 22, the first resistance 23 and the second resistance 24 forms wheatstone bridge;
In the above-described embodiments, when sensor is started working, provide fixing operating voltage by power input to sensor.
When sensor is in initial stage of operation, detecting device (black element) 21 and compensator (white element) 22 enter warm-up phase, this moment, the voltage of wheatstone bridge output terminal will be by high step-down, when detecting device (black element) 21 and compensator (white element) 22 after reaching thermal equilibrium after a while, this moment, the output end voltage of wheatstone bridge should be zero, and the zero point of sensor;
Therefore, in order to make sensor before gas concentration is detected, can be in the state at zero point, enter warm-up phase at detecting device (black element) 21 and compensator (white element) 22, in the process of the voltage of wheatstone bridge output terminal by high step-down, detect the output end voltage of wheatstone bridge by controller 26, generate control signal according to output voltage, and the control signal that generates is sent to voltage follower circuit 25, it is zero voltage that voltage follower circuit 25 is regulated the wheatstone bridge output voltage according to the control signal output that receives.
When sensor begins gas concentration is detected through after the initialization, when having detected gas to exist, detecting device (black element) 21 and gas generation oxidation reaction, the heat that produces rises the resistance of black element, compensator (white element) 22 does not react with gas, white component resistance can not change, electric bridge out of trim, output and the directly proportional voltage signal of gas concentration;
When if the voltage of the wheatstone bridge output terminal that detect by controller 26 this moment is a fixed voltage value within a period of time, show that there is zero point drift at this moment in sensor, the voltage of the wheatstone bridge output terminal that need to detect according to controller 26 generates control signal, and this control signal is sent to voltage follower circuit 25, voltage follower circuit 25 according to the control signal output that receives so that the wheatstone bridge output voltage is zero voltage.
Perhaps, when if the voltage of the wheatstone bridge output terminal that detect by controller 26 this moment is negative value, show that there is reverse excursion at this moment in sensor, the voltage of the wheatstone bridge output terminal that need to detect according to controller 26 generates control signal, and this control signal is sent to voltage follower circuit 25, voltage follower circuit 25 according to the control signal output that receives so that the wheatstone bridge output voltage is zero voltage.
In above-mentioned working sensor process, by controller the wheatstone bridge output voltage is detected in real time, and judge whether the output voltage that detects is normal at stages, when output voltage is undesired, generate control signal, the voltage of wheatstone bridge output voltage is regulated in control voltage follower circuit output, has realized when occur to drift about the zero point of sensor, need not artificial participation, real-time, convenient, fast and accurate sensor is carried out automatic zero point correcting.
The disclosed controller architecture synoptic diagram of another embodiment of the present utility model as shown in Figure 3, comprising:
Detecting unit 31, judging unit 32, control signal generation unit 33 and transmitting element 34; Wherein:
Detecting unit 31 links to each other with judging unit 32, for detection of the output voltage of described wheatstone bridge;
Control signal generation unit 33 links to each other with transmitting element 34, is used for generating control signal when judging unit 32 judges that described output voltage is fixed value or negative value within a certain period of time;
Transmitting element 34 links to each other with described voltage follower circuit, is used for described control signal is sent to described voltage follower circuit.
Concrete, initial phase at sensor, the voltage of judging the wheatstone bridge output terminal that detecting units 31 detect when judging unit 32 is during by high step-down, control signal generation unit 33 generates control signal according to the output voltage that detecting unit 31 detects, transmitting element 34 is sent to voltage follower circuit 25 with the control signal that generates, and it is zero voltage that voltage follower circuit 25 is regulated the wheatstone bridge output voltage according to the control signal output that receives;
At sensor when beginning after the initialization gas concentration detected, if judge that by judging unit 32 voltage of the wheatstone bridge output terminal that detecting unit 31 detects is a fixed voltage value this moment within a period of time, show that there is zero point drift at this moment in sensor, control signal generation unit 33 generates control signal according to the output voltage that detecting unit 31 detects, transmitting element 34 is sent to voltage follower circuit 25 with the control signal that generates, and it is zero voltage that voltage follower circuit 25 is regulated the wheatstone bridge output voltage according to the control signal output that receives;
Perhaps, if this moment is when judging that by judging unit 32 voltage of the wheatstone bridge output terminal that detecting unit 31 detects is negative value, show that there is reverse excursion at this moment in sensor, control signal generation unit 33 generates control signal according to the output voltage that detecting unit 31 detects, transmitting element 34 is sent to voltage follower circuit 25 with the control signal that generates, and it is zero voltage that voltage follower circuit 25 is regulated the wheatstone bridge output voltage according to the control signal output that receives.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (2)
1. the circuit to the sensor automatic zero point correcting is characterized in that, comprising: detecting device, compensator, the first resistance, the second resistance, voltage follower circuit and controller; Wherein:
After being electrically connected, described detecting device, compensator, the first resistance and the second resistance forms wheatstone bridge;
Described controller one end links to each other with the common electrical link of described detecting device and compensator, the other end links to each other with the common electrical link of described the first resistance and the second resistance, output voltage for detection of described wheatstone bridge, and judge whether described output voltage is normal, if undesired then according to described output voltage generation control signal, and send described control signal;
Described voltage follower circuit one end is electrically connected with described controller, the other end and described the first resistance be connected the common electrical link of resistance and be connected, be used for receiving the described control signal that described controller sends, and be zero voltage according to the described wheatstone bridge output voltage of described control signal output adjusting.
2. the circuit to the sensor automatic zero point correcting according to claim 1 is characterized in that, described controller comprises: detecting unit, judging unit, control signal generation unit and transmitting element; Wherein:
Described detecting unit links to each other with described judging unit, for detection of the output voltage of described wheatstone bridge;
Described judging unit links to each other with described control signal generation unit, is used for judging whether described output voltage is fixed value within a certain period of time or is negative value;
Described control signal generation unit links to each other with described transmitting element, is used for generating control signal when the described output voltage of described judgment unit judges is fixed value or negative value within a certain period of time;
Described transmitting element links to each other with described voltage follower circuit, is used for described control signal is sent to described voltage follower circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220373110 CN202903724U (en) | 2012-07-30 | 2012-07-30 | Circuit for automatic zero calibration of sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220373110 CN202903724U (en) | 2012-07-30 | 2012-07-30 | Circuit for automatic zero calibration of sensor |
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| Publication Number | Publication Date |
|---|---|
| CN202903724U true CN202903724U (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220373110 Expired - Lifetime CN202903724U (en) | 2012-07-30 | 2012-07-30 | Circuit for automatic zero calibration of sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575763A (en) * | 2012-07-30 | 2014-02-12 | 河南汉威电子股份有限公司 | Circuit and method for automatic zero calibration for sensor |
-
2012
- 2012-07-30 CN CN 201220373110 patent/CN202903724U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575763A (en) * | 2012-07-30 | 2014-02-12 | 河南汉威电子股份有限公司 | Circuit and method for automatic zero calibration for sensor |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CP01 | Change in the name or title of a patent holder |
Address after: 169 Cedar Road No. 450004, hi tech Development Zone, Henan, Zhengzhou Patentee after: HANWEI ELECTRONICS Group Corp. Address before: 169 Cedar Road No. 450004, hi tech Development Zone, Henan, Zhengzhou Patentee before: HENAN HANWEI ELECTRONICS Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130424 |