CN203385430U - Sensing circuit and sensor - Google Patents
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- CN203385430U CN203385430U CN201320416060.2U CN201320416060U CN203385430U CN 203385430 U CN203385430 U CN 203385430U CN 201320416060 U CN201320416060 U CN 201320416060U CN 203385430 U CN203385430 U CN 203385430U
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Abstract
The utility model pertains to the field of sensing technologies, and specially relates to a sensing circuit and a sensor. According to the utility model, by adopting the sending circuit comprising a sensing module, an amplifying module, a filtering module, an analog-to-digital conversion module, a master control module, a storage module, a temperature sensing module and a digital-to-analogue conversion module, external environment parameters are converted into a sensing signal through the sensing module, amplification is performed by the amplifying module according to a preset amplification coefficient, filtering is performed on the signal by the filtering module, the master control module is used to generate a standard data sheet in the storage module according to a temperature signal and an electrical signal in the sensing circuit in the preparatory stage and read a corresponding calibrating signal according to the temperature signal in the working stage, an excitation voltage signal and a direct-current biasing signal are outputted by the digital-to-analogue conversion module, voltage adjustment is performed on the sensing module and the master control module to realize zero temperature drift compensation and sensitivity temperature drift compensation of the sensing circuit, and the whole sending circuit has advantages of large temperature compensation range, high accuracy and low noise.
Description
Technical field
The utility model belongs to field of sensing technologies, particularly a kind of sensing circuit and sensor.
Background technology
Sensor can obtain various physical messages and be converted into the electric signal that is easy to transmission and processes, and is widely used in various scientific researches and production run.The sensitive element of most of sensors adopts metal or semiconductor material to make, and its static characteristics is relevant with environment temperature.In actual applications, the operating ambient temperature of sensor often changes larger, and the temperature variation of working environment can be brought sensor and comprises that zero point, temperature was floated the measuring error of floating with Sensitivity Temperature, so must take corresponding measure to eliminate or reduce the impact that temperature variation causes the measuring accuracy of sensor, the signal that sensor is exported carries out temperature compensation.
In the prior art, generally by digital programmable sensor and signal amplifier, sensor signal is amplified, and export a fixing gain amplifier and bias voltage, recycle transistorized temperature characterisitic and the driving voltage of bridge type magnetic sensor is regulated to reach signal that sensor is exported.Yet the transistor of different materials has different temperature characterisitics, even the transistor that adopts same process and same material to make, its temperature characterisitic is difference to some extent also.Therefore, utilize transistorized temperature characterisitic to carry out that the precision of temperature compensation is not high, temperature compensation range is little.
In addition, can also utilize in the prior art the programmable sensor signal conditioner carry out zero point temperature drift compensation, compensation of α TCS and sensor signal is amplified sensor signal.It obtains temperature by temperature cycling test, sensitivity, export the calibration data of three parameters zero point, according to these data and built-in calibration data table, export corresponding gain amplifier and bias voltage, to realize zero point temperature drift compensation and the compensation of α TCS to sensor output signal.Yet, because this Technology Need is exported corresponding gain amplifier and bias voltage by inner digital to analog converter, can in circuit, introduce larger noise.
In sum, there is the problem that temperature compensation range is little, precision low and noise is large in existing sensor.
The utility model content
The purpose of this utility model is to provide a kind of sensing circuit, is intended to solve the problem that temperature compensation range is little, precision low and noise is large that existing sensor exists.
The utility model is achieved in that a kind of sensing circuit, comprising:
Power positive end receives driving voltage signal, the sensing module of exporting positive transducing signal and negative transducing signal according to variation and the described driving voltage signal of external environment parameters;
Positive input terminal and negative input end are connected respectively positive output end and the negative output terminal of described sensing module, controlled end receives the direct current biasing signal, according to described direct current biasing signal and default amplification coefficient, described positive transducing signal and described negative transducing signal is amplified to the amplification module of processing and export the first transducing signal;
Input end connects the output terminal of described amplification module, and described the first transducing signal is carried out the filtering processing and exports the filtration module of the second transducing signal;
First input end, the second input end, the 3rd input end and four-input terminal connect respectively the output terminal of the negative output terminal of the positive output end of described sensing module, described sensing module, described amplification module and the output terminal of described filtration module, described positive transducing signal, described negative transducing signal, described the first transducing signal and described the second transducing signal are carried out to the analog-to-digital conversion module of analog-to-digital conversion process output digit signals;
Data input pin connects the output terminal of described analog-to-digital conversion module, the temperature receiving end receives temperature signal, output initial calibration signal when starting, calculate driving voltage numerical value and DC offset voltage numerical value in the preproduction phase according to described temperature signal, described digital signal, and export the calibrating signal that comprises Temperature numerical, driving voltage numerical value and DC offset voltage numerical value by sending and receiving end, read calibrating signal according to described temperature signal by sending and receiving end at working stage and export the main control module of described calibrating signal by data output end;
Output terminal connects described temperature receiving end, according to the temperature sensing module of ambient temperature output temperature signal;
Sending and receiving end connects the sending and receiving end of described main control module, generates the memory module of calibration data table according to described calibrating signal;
Input end connects described data output end, the first control end connects the power positive end of described sensing module, the second control end connects the controlled end of described amplification module, and described initial calibration signal and described calibrating signal are carried out the digital-to-analog conversion processing and exported respectively the D/A converter module of described driving voltage signal and described direct current biasing signal.
Another purpose of the present utility model also is to provide a kind of sensor, comprises housing, and described sensor also comprises above-mentioned sensing circuit.
The utility model comprises described sensing module by employing, described amplification module, described filtration module, described analog-to-digital conversion module, described main control module, described memory module, the described sensing circuit of described temperature sensing module and described D/A converter module, by described sensing module, external environment parameters is converted to described positive transducing signal and described negative transducing signal, export described the first transducing signal by described amplification module according to the signal of default amplification coefficient and the output of described sensor again, by described filtration module, described the first transducing signal being done to filtering processes to reduce signal noise and exports described the second transducing signal, by described main control module the described preproduction phase according to described temperature signal with comprise described positive transducing signal, described negative transducing signal, the described digital signal of described the first transducing signal and described the second transducing signal generates and comprises Temperature numerical in described memory module, the calibration data table of driving voltage numerical value and DC offset voltage numerical value, and read corresponding calibrating signal at working stage according to described temperature signal, export described driving voltage signal and described direct current biasing signal by described D/A converter module, described sensing module and described amplification module are carried out to the voltage adjustment, to realize the zero point temperature drift compensation to described sensing circuit, compensation of α TCS, it is large that whole described sensing circuit has temperature compensation range, the advantage that precision is high and noise is low.
The accompanying drawing explanation
Fig. 1 is the modular structure figure of the sensing circuit that provides of the utility model embodiment;
Fig. 2 is the exemplary circuit structural drawing of the sensing module that provides of the utility model embodiment;
Fig. 3 is the exemplary circuit structural drawing of the amplification module that provides of the utility model embodiment;
Fig. 4 is the exemplary circuit structural drawing of the filtration module that provides of the utility model embodiment;
Fig. 5 is the exemplary circuit structural drawing of the control module that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
The sensing circuit that comprises sensing module, amplification module, filtration module, analog-to-digital conversion module, main control module, memory module, temperature sensing module and D/A converter module by employing of the present utility model, zero point temperature drift compensation, the compensation of α TCS of realization to sensing circuit, it is low with noise that whole sensing circuit has advantages of that temperature compensation range is large, precision is high.
Fig. 1 shows the modular structure of the sensing circuit that the utility model embodiment provides, and for convenience of explanation, only shows and the utility model relevant portion, and details are as follows:
The sensing circuit that the utility model embodiment provides comprises:
Power positive end receives driving voltage signal, the sensing module 10 of exporting positive transducing signal and negative transducing signal according to variation and the driving voltage signal of external environment parameters.
Positive input terminal and negative input end are connected respectively positive output end and the negative output terminal of sensing module 10, controlled end receives the direct current biasing signal, according to the direct current biasing signal and default amplification coefficient aligns transducing signal and negative transducing signal amplifies the amplification module 20 of processing and export the first transducing signal.
Input end connects the output terminal of amplification module 20, and the first transducing signal is carried out the filtering processing and exports the filtration module 30 of the second transducing signal.
First input end, the second input end, the 3rd input end and four-input terminal connect respectively the positive output end of described sensing module 10, the negative output terminal of described sensing module 10, the output terminal of described amplification module 20 and the output terminal of described filtration module 30, described positive transducing signal, described negative transducing signal, described the first transducing signal and described the second transducing signal are carried out to the analog-to-digital conversion module 401 of analog-to-digital conversion process output digit signals;
Data input pin connects the output terminal of described analog-to-digital conversion module 401, the temperature receiving end receives temperature signal, output initial calibration signal when starting, calculate driving voltage numerical value and DC offset voltage numerical value in the preproduction phase according to described temperature signal, described digital signal, and export the calibrating signal that comprises Temperature numerical, driving voltage numerical value and DC offset voltage numerical value by sending and receiving end, read calibrating signal according to described temperature signal by sending and receiving end at working stage and export the main control module 402 of described calibrating signal by data output end;
Output terminal connects described temperature receiving end, according to the temperature sensing module 403 of ambient temperature output temperature signal;
Sending and receiving end connects the sending and receiving end of described main control module 402, generates the memory module 404 of calibration data table according to described calibrating signal;
Input end connects described data output end, the first control end connects the power positive end of described sensing module 10, the second control end connects the controlled end of described amplification module 20, and described initial calibration signal and described calibrating signal are carried out the digital-to-analog conversion processing and exported respectively the D/A converter module 405 of described driving voltage signal and described direct current biasing signal.
In the utility model embodiment, analog-to-digital conversion module 401, main control module 402, memory module 404, temperature sensing module 403 and D/A converter module 405 can composition control modules 40.First input end, the second input end, the 3rd input end and four-input terminal that the first input end of analog-to-digital conversion module 401, the second input end, the 3rd input end and four-input terminal are control module, the first control end that the first control end of D/A converter module 405 and the second control end are control module 40 and the second control end.
In the utility model embodiment, the user can, according to self-demand, select sensing circuit to be operated in preproduction phase or working stage.In working stage, control module 40 stops temperature detection and retrieval calibration data table in the time of can also being less than preset value in the variation range of ambient temperature, and maintain driving voltage signal and direct current biasing signal now, enter holding state, further to reduce the noise in circuit.
In the utility model embodiment, the driving voltage signal that control module 40 is exported and direct current biasing signal can pass through low-pass filter in advance, with the high frequency noise in filtered signal.
In the utility model embodiment, the user can also, according to self-demand, carry out auto zero control by the output signal of monitoring each module to amplification module 20.
In the utility model embodiment, the sensitivity of sensing module 10 can change along with the variation of ambient temperature within the specific limits, also can change along with the variation of driving voltage signal simultaneously, so the variation of the sensitivity that comes balance and counteracting to be caused by temperature variation by the variation of controlling the driving voltage signal, thereby reach the temperature compensation to sensing module 10 sensitivity.In addition, the zero point of sensing module 10, output also can change along with the variation of ambient temperature, so just can reach the temperature compensation to sensing module output at 10 zero point by the biasing voltage signal of controlling amplification module 20.
In another embodiment of the present utility model, analog-to-digital conversion module 401, main control module 402, memory module 404, temperature sensing module 403 and D/A converter module 405 can be respectively existing analog to digital converter, single-chip microcomputer, storage chip, temperature sensor and digital to analog converter.
Fig. 2 shows the exemplary circuit structure of the sensing module 10 that the utility model embodiment provides, and for convenience of explanation, only shows and the utility model relevant portion, and details are as follows:
As the utility model one embodiment, sensing module 10 comprises:
The first stress sensitive resistance R Z1, the second stress sensitive resistance R Z2, tertiary stress sensitive resistance RZ3, the 4th stress sensitive resistance R Z4, resistance R 1 and resistance R 2;
The first end of the first end of the first stress sensitive resistance R Z1 and the second stress sensitive resistance R Z2 connects the power positive end that forms sensing module 10 altogether, the first end of the second end of the first stress sensitive resistance R Z1 and the 4th stress sensitive resistance R Z4 connects the positive output end that forms sensing module 10 altogether, the first end of the second end of the second stress sensitive resistance R Z2 and tertiary stress sensitive resistance RZ3 connects the negative output terminal of described sensing module 10 altogether, the first end of the second end contact resistance R2 of the 4th stress sensitive resistance R Z4, the first end of the second end contact resistance R1 of tertiary stress sensitive resistance RZ3, the second end of resistance R 1 and the second end of resistance R 2 are connected to ground altogether.
In the utility model embodiment, the first stress sensitive resistance R Z1, the second stress sensitive resistance R Z2, tertiary stress sensitive resistance RZ3 and the 4th stress sensitive resistance R Z4 form a pressure resistance type electric bridge acceleration transducer.Can respond to due to stress sensitive resistance the mass skew be attached thereto is produced stress, when sensing module is static, only has acceleration of gravity to its generation effect, when measurement environment produces vibration, detect and analyze by aligning transducing signal and negative transducing signal, just can obtain acceleration information.
In the utility model embodiment, the user can carry out manual compensation to sensing module 10 by the resistance of regulating resistance R1 and R2.
In another embodiment of the present utility model, sensing module 10 can also be the bridge type pressure transducer consisted of stress sensitive resistance or the bridge type light sensor consisted of photoresistance etc.
Fig. 3 shows the exemplary circuit structure of the amplification module 20 that the utility model embodiment provides, and for convenience of explanation, only shows and the utility model relevant portion, and details are as follows:
As the utility model one embodiment, amplification module 20 comprises:
The first operational amplifier U1, the second operational amplifier U2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, capacitor C 1 and capacitor C 2;
The first end of the in-phase end of the first operational amplifier U1 and capacitor C 2 connects the negative input end that forms amplification module 20 altogether, the end of oppisite phase of the first operational amplifier U1, the first end of the first end of resistance R 4 and resistance R 6 is connected to the first end of resistance R 7 altogether, the second end of the output terminal of the first operational amplifier U1 and resistance R 7 connects the output terminal that forms amplification module 20 altogether, the second end of resistance R 4, the first end of resistance R 5, the first end of resistance R 3 is connected to the end of oppisite phase of the second operational amplifier U2 altogether, the second end of resistance R 5, the second end of resistance R 6 is connected to the output terminal of the second operational amplifier U2 altogether, the second end of resistance R 3 is controlled ends of amplification module 20, the first end of the in-phase end of the second operational amplifier U2 and capacitor C 1 connects the positive input terminal that forms amplification module 20 altogether, the second end ground connection of capacitor C 1.
In the utility model embodiment, amplification module 20 is a low noise instrumentation amplifier, the user can be by regulating resistance R4, resistance R 5, resistance R 6 and resistance R 7 resistance so that the amplification coefficient of amplification module 20 to be set, the sensitivity of sensing circuit is adjusted simultaneously.
Fig. 4 shows the exemplary circuit structure of the filtration module 30 that the utility model embodiment provides, and for convenience of explanation, only shows and the utility model relevant portion, and details are as follows:
As the utility model one embodiment, filtration module 30 comprises:
Resistance R 8, resistance R 9, resistance R 10, capacitor C 3, capacitor C 4 and the 3rd operational amplifier U3;
The first end of resistance R 8 is input ends of filtration module 30, the second end of resistance R 8 and the first end of resistance R 9 are connected to the first end of capacitor C 3 altogether, the second end of resistance R 9 and the first end of capacitor C 4 are connected to the in-phase end of the 3rd operational amplifier U3 altogether, the second end ground connection of capacitor C 4, the end of oppisite phase of the second end of capacitor C 3, the output terminal of the 3rd operational amplifier U3 and the 3rd operational amplifier U3 is connected to the first end of resistance R 10 altogether, and the second end of resistance R 10 is output terminals of filtration module 30.
In the utility model embodiment, filtration module 30 is a low-pass filter, the high frequency noise in can filtering the first transducing signal.
Fig. 5 shows the exemplary circuit structure of the control module 40 that the utility model embodiment provides, and for convenience of explanation, only shows and the utility model relevant portion, and details are as follows:
As the utility model one embodiment, control module 40 comprises:
Resistance R 11, resistance R 12, capacitor C 5, capacitor C 6, four-operational amplifier U4, the 5th operational amplifier U5 and control chip U6;
The output terminal of four-operational amplifier U4 and the end of oppisite phase of four-operational amplifier U4 connect the first control end of formation control module 40 altogether, the first end of the in-phase end of four-operational amplifier U4 and capacitor C 5 is connected to the first end of resistance R 11 altogether, the second end of resistance R 11 connects the first control end DA0 of control chip U6, the second end ground connection of capacitor C 5, the end of oppisite phase of the output terminal of the 5th operational amplifier U5 and the 5th operational amplifier U5 connects the second control end of formation control module 40 altogether, the first end of the in-phase end of the 5th operational amplifier U5 and capacitor C 6 is connected to the first end of resistance R 12 altogether, the second end of resistance R 12 connects the second control end DA1 of control chip U6, the second end ground connection of capacitor C 6, the first input end ON of control chip U6 is the first input end of control module 40, the second input end OP of control chip U6 is the second input end of control module 40, the 3rd input end OUT1 of control chip U6 is the 3rd input end of control module 40, the four-input terminal OUTP of control chip U6 is the four-input terminal of control module 40, the power end VCC1 access external power source VCC of control chip U6, the earth terminal GND ground connection of control chip U6.
In the utility model embodiment, control chip U6 is built-in temperature sensor, data-carrier store, digital to analog converter and analog to digital converter.
In the utility model embodiment, resistance R 11, capacitor C 5 and four-operational amplifier U4 form a low-pass filter, the high frequency noise in can filtering driving voltage signal; Resistance R 12, capacitor C 6 and the 5th operational amplifier U5 form a second-order low-pass filter circuit, the high frequency noise in can filtering direct current biasing signal.
In the utility model embodiment, control chip U6 can be the chip that model is MSC1213Y2 or MSC1213Y2PAGR.
The principle of work of sensing circuit the utility model embodiment provided below in conjunction with Fig. 1 to Fig. 5 is described further:
At sensing circuit during in the preproduction phase, control chip U6 is the driving voltage signal and initial direct current biasing signal initial with amplification module 20 outputs to sensing module 10 first, so that sensing module 10 and amplification module 20 are started working.The user now needs to utilize air conditioner refrigerating or heat to change environment temperature.Control chip U6 generates calibration data table by testing and store the positive transducing signal at the varying environment temperature, negative transducing signal, the first transducing signal and the second transducing signal.The user answers the data that record under different temperatures as much as possible, so that calibration data table is more complete.
At the working stage of sensing circuit, the user is placed in environment to be detected by sensing circuit.Control chip U6 is same first exports initial driving voltage signal and initial direct current biasing signal to sensing module 10 and amplification module 20, so that sensing module 10 is started working with amplification module 20.Now control chip U6 detects according to self the temperature value obtained, simultaneously in conjunction with in calibration data table with current temperature value immediate data output drive voltage signal and direct current biasing signal, realize sensing module 10 and amplification module 20 are carried out to temperature compensation.
At control chip U6 to sensing module 10 during with amplification module 20 output drive voltage signals and direct current biasing signal, signal all can carry out filtering through the low-pass filter be connected with control chip U6 port, avoids noise is brought in sensing module 10 and amplification module 20.Control module 40 not only receives the first transducing signal that amplification module 20 is exported, and also receives the second transducing signal after processing after filtering, so that the calibration data table obtained is more accurate.
When temperature variation is less than preset value, control chip U6 stops temperature compensation further to reduce circuit noise.
Another purpose of the utility model embodiment also is to provide a kind of sensor, comprises housing, also comprises above-mentioned sensing circuit.
The utility model comprises sensing module 10 by employing, amplification module 20, filtration module 30, analog-to-digital conversion module 401, main control module 402, memory module 404, the sensing circuit of temperature sensing module 403 and D/A converter module 405, by sensing module 10, external environment parameters is converted to positive transducing signal and negative transducing signal, export the first transducing signal by amplification module 20 according to the signal of default amplification coefficient and sensor output again, doing filtering by 30 pairs of the first transducing signals of filtration module processes to reduce signal noise and exports the second transducing signal, by main control module 402 the preproduction phase according to temperature signal with comprise positive transducing signal, negative transducing signal, the digital signal of the first transducing signal and the second transducing signal generates and comprises Temperature numerical in memory module 404, the calibration data table of driving voltage numerical value and DC offset voltage numerical value, and read corresponding calibrating signal at working stage according to temperature signal, by D/A converter module 405 output drive voltage signals and direct current biasing signal, sensing module 10 and amplification module 20 are carried out to the voltage adjustment, to realize the zero point temperature drift compensation to sensing circuit, compensation of α TCS, it is large that whole sensing circuit has temperature compensation range, the advantage that precision is high and noise is low.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (7)
1. a sensing circuit, is characterized in that, described sensing circuit comprises:
Power positive end receives driving voltage signal, the sensing module of exporting positive transducing signal and negative transducing signal according to variation and the described driving voltage signal of external environment parameters;
Positive input terminal and negative input end are connected respectively positive output end and the negative output terminal of described sensing module, controlled end receives the direct current biasing signal, according to described direct current biasing signal and default amplification coefficient, described positive transducing signal and described negative transducing signal is amplified to the amplification module of processing and export the first transducing signal;
Input end connects the output terminal of described amplification module, and described the first transducing signal is carried out the filtering processing and exports the filtration module of the second transducing signal;
First input end, the second input end, the 3rd input end and four-input terminal connect respectively the output terminal of the negative output terminal of the positive output end of described sensing module, described sensing module, described amplification module and the output terminal of described filtration module, described positive transducing signal, described negative transducing signal, described the first transducing signal and described the second transducing signal are carried out to the analog-to-digital conversion module of analog-to-digital conversion process output digit signals;
Data input pin connects the output terminal of described analog-to-digital conversion module, the temperature receiving end receives temperature signal, output initial calibration signal when starting, calculate driving voltage numerical value and DC offset voltage numerical value in the preproduction phase according to described temperature signal, described digital signal, and export the calibrating signal that comprises Temperature numerical, driving voltage numerical value and DC offset voltage numerical value by sending and receiving end, read calibrating signal according to described temperature signal by sending and receiving end at working stage and export the main control module of described calibrating signal by data output end;
Output terminal connects described temperature receiving end, according to the temperature sensing module of ambient temperature output temperature signal;
Sending and receiving end connects the sending and receiving end of described main control module, generates the memory module of calibration data table according to described calibrating signal;
Input end connects described data output end, the first control end connects the power positive end of described sensing module, the second control end connects the controlled end of described amplification module, and described initial calibration signal and described calibrating signal are carried out the digital-to-analog conversion processing and exported respectively the D/A converter module of described driving voltage signal and described direct current biasing signal.
2. sensing circuit as claimed in claim 1, is characterized in that, described sensing module comprises:
The first stress sensitive resistance, the second stress sensitive resistance, tertiary stress sensitive resistance, the 4th stress sensitive resistance, resistance R 1 and resistance R 2;
The first end of the first end of described the first stress sensitive resistance and described the second stress sensitive resistance connects the power positive end that forms described sensing module altogether, the second end of described the first stress sensitive resistance and the first end of described the 4th stress sensitive resistance connect the positive output end that forms described sensing module altogether, the second end of described the second stress sensitive resistance and the first end of described tertiary stress sensitive resistance connect the negative output terminal of described sensing module altogether, the second end of described the 4th stress sensitive resistance connects the first end of described resistance R 2, the second end of described tertiary stress sensitive resistance connects the first end of described resistance R 1, the second end of described resistance R 1 and the second end of described resistance R 2 are connected to ground altogether.
3. sensing circuit as claimed in claim 1, it is characterized in that, described sensing module is bridge type acceleration transducer, the bridge type pressure transducer consisted of stress sensitive resistance consisted of stress sensitive resistance or the bridge type light sensor consisted of photoresistance.
4. sensing circuit as claimed in claim 1, is characterized in that, described amplification module comprises:
The first operational amplifier, the second operational amplifier, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, capacitor C 1 and capacitor C 2;
The first end of the in-phase end of described the first operational amplifier and described capacitor C 2 connects the negative input end that forms described amplification module altogether, the end of oppisite phase of described the first operational amplifier, the first end of the first end of described resistance R 4 and described resistance R 6 is connected to the first end of described resistance R 7 altogether, the second end of the output terminal of described the first operational amplifier and described resistance R 7 connects the output terminal that forms described amplification module altogether, the second end of described resistance R 4, the first end of described resistance R 5, the first end of described resistance R 3 is connected to the end of oppisite phase of described the second operational amplifier altogether, the second end of described resistance R 5, the second end of described resistance R 6 is connected to the output terminal of described the second operational amplifier altogether, the second end of described resistance R 3 is controlled ends of described amplification module, the first end of the in-phase end of described the second operational amplifier and described capacitor C 1 connects the positive input terminal that forms described amplification module altogether, the second end ground connection of described capacitor C 1.
5. sensing circuit as claimed in claim 1, is characterized in that, described filtration module comprises:
Resistance R 8, resistance R 9, resistance R 10, capacitor C 3, capacitor C 4 and the 3rd operational amplifier;
The first end of described resistance R 8 is input ends of described filtration module, the second end of described resistance R 8 and the first end of described resistance R 9 are connected to the first end of described capacitor C 3 altogether, the second end of described resistance R 9 and the first end of described capacitor C 4 are connected to the in-phase end of described the 3rd operational amplifier altogether, the second end ground connection of described capacitor C 4, the end of oppisite phase of the second end of described capacitor C 3, the output terminal of described the 3rd operational amplifier and described the 3rd operational amplifier is connected to the first end of described resistance R 10 altogether, and the second end of described resistance R 10 is output terminals of described filtration module.
6. sensing circuit as claimed in claim 1, it is characterized in that, described analog-to-digital conversion module, described main control module, described memory module, described temperature sensing module and described D/A converter module composition control module, first input end, the second input end, the 3rd input end and four-input terminal that the first input end of described analog-to-digital conversion module, the second input end, the 3rd input end and four-input terminal are described control module, the first control end that the first control end of described D/A converter module and the second control end are described control module and the second control end;
Described control module comprises:
Resistance R 11, resistance R 12, capacitor C 5, capacitor C 6, four-operational amplifier, the 5th operational amplifier and control chip;
The output terminal of described four-operational amplifier and the end of oppisite phase of described four-operational amplifier connect the first control end that forms described control module altogether, the first end of the in-phase end of described four-operational amplifier and described capacitor C 5 is connected to the first end of described resistance R 11 altogether, the second end of described resistance R 11 connects the first control end of described control chip, the second end ground connection of described capacitor C 5, the end of oppisite phase of the output terminal of described the 5th operational amplifier and described the 5th operational amplifier connects the second control end that forms described control module altogether, the first end of the in-phase end of described the 5th operational amplifier and described capacitor C 6 is connected to the first end of described resistance R 12 altogether, the second end of described resistance R 12 connects the second control end of described control chip, the second end ground connection of described capacitor C 6, the first input end of described control chip is the first input end of described control module, the second input end of described control chip is the second input end of described control module, the 3rd input end of described control chip is the 3rd input end of described control module, the four-input terminal of described control chip is the four-input terminal of described control module, the power end access external power source of described control chip, the earth terminal ground connection of described control chip U6.
7. a sensor, comprise housing, it is characterized in that, described sensor also comprises sensing circuit as described as claim 1 to 6 any one.
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| CN106353005A (en) * | 2016-10-11 | 2017-01-25 | 四川森迪科技发展股份有限公司 | Chicken farm remote temperature monitoring system based on source electrode follower circuit |
| CN106384493A (en) * | 2016-10-11 | 2017-02-08 | 四川森迪科技发展股份有限公司 | Biasing amplifying circuit based remote temperature monitoring system for chicken farm |
| CN106681210A (en) * | 2016-12-29 | 2017-05-17 | 重庆奥海辉龙大数据有限公司 | Integrated intelligent sensor system and data collection method |
| CN110857898A (en) * | 2018-08-22 | 2020-03-03 | 精量电子（深圳）有限公司 | Oil-filled pressure sensor |
-
2013
- 2013-07-12 CN CN201320416060.2U patent/CN203385430U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104615054A (en) * | 2015-01-22 | 2015-05-13 | 北京奥普维尔科技有限公司 | System and method for power invariability of laser |
| CN106353005A (en) * | 2016-10-11 | 2017-01-25 | 四川森迪科技发展股份有限公司 | Chicken farm remote temperature monitoring system based on source electrode follower circuit |
| CN106384493A (en) * | 2016-10-11 | 2017-02-08 | 四川森迪科技发展股份有限公司 | Biasing amplifying circuit based remote temperature monitoring system for chicken farm |
| CN106681210A (en) * | 2016-12-29 | 2017-05-17 | 重庆奥海辉龙大数据有限公司 | Integrated intelligent sensor system and data collection method |
| CN110857898A (en) * | 2018-08-22 | 2020-03-03 | 精量电子（深圳）有限公司 | Oil-filled pressure sensor |
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