CN218539708U - Carbon dioxide incubator - Google Patents
Carbon dioxide incubator Download PDFInfo
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- CN218539708U CN218539708U CN202221690052.2U CN202221690052U CN218539708U CN 218539708 U CN218539708 U CN 218539708U CN 202221690052 U CN202221690052 U CN 202221690052U CN 218539708 U CN218539708 U CN 218539708U
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Abstract
The utility model relates to a carbon dioxide incubator, including the box, set up the control circuit board on the box, set up in the box and with two temperature sensor of control circuit board difference electric signal connection, one of them temperature sensor is for being used for measuring the first temperature sensor of low temperature section temperature, another temperature sensor is for being used for measuring the second temperature sensor of full temperature section temperature. This carbon dioxide incubator, two temperature sensor have the detection temperature value that high accuracy low temperature floats, but self-checking testing result accuracy and stability each other make incubator control system's work more stable. In addition, even if one temperature sensor breaks down in the operation process of the incubator, the set cultivation work can still be stably completed by using the detection work of the other temperature sensor, the stop work caused by incapability of acquiring temperature data is avoided, and the major loss is avoided, so that the reliability of the carbon dioxide incubator is improved.
Description
Technical Field
The utility model relates to a carbon dioxide incubator.
Background
The carbon dioxide incubator is a device for culturing cells/tissues in vitro by simulating the growth environment of the cells/tissues in organisms in the incubator body. The incubator requires a stable temperature (37 ℃), a stable carbon dioxide level (5%), a constant pH value (pH value: 7.2-7.4), a higher relative saturation humidity (95%).
The carbon dioxide incubator is required to be capable of providing the most accurate and stable control of temperature, carbon dioxide concentration and humidity in order to facilitate the progress of its research work. The carbon dioxide incubator can carry out effectual prevention to the microbial contamination in the incubator to can regularly eliminate and pollute, with the protection research achievement, prevent the sample loss.
The carbon dioxide incubator directly heats the incubator body through the heaters distributed in the incubator body air jacket layer, has the advantages of fast heating and good temperature uniformity, and is particularly favorable for short-term culture and the culture with frequent opening and closing of the incubator door. The internal temperature of the oven was set at 37 ℃ C. + -. 0.2 ℃.
Because the carbon dioxide incubator requires very high to the temperature accuracy, but its self temperature detector's signal is weak, has many interfering signal for the measured value is unstable, leads to the uncontrollable temperature because of sensor self and detecting system trouble moreover easily, causes great loss. At present, the temperature in the carbon dioxide incubator is often detected by adopting a single-way temperature sensor, and the single-way temperature sensor has the following problems: (1) limited detection sensitivity; (2) susceptible to interference from external signals; (3) no-process check and calibration; (4) it cannot be discriminated whether or not the sensor has failed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a carbon dioxide incubator that detects the sensitivity height, anti-interference, can realize that the temperature detects the calibration and can normally work when a temperature sensor inefficacy is provided to above-mentioned prior art.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a carbon dioxide incubator, includes the box, sets up the control circuit board on the box, its characterized in that: the temperature sensor is a first temperature sensor used for measuring the temperature of the low-temperature section, and the other temperature sensor is a second temperature sensor used for measuring the temperature of the full-temperature section.
Preferably, the temperature range of the low-temperature section detected by the first temperature sensor is 10-60 ℃; the temperature range of the full temperature section detected by the second temperature sensor is 0-200 ℃.
Preferably, the first temperature sensor adopts a platinum resistor with the model number PT1000, and the second temperature sensor adopts a platinum resistor with the model number PT 100.
As an improvement, the control circuit board is provided with temperature detection circuits corresponding to the first temperature sensor and the second temperature sensor respectively, and the control circuit board is also provided with a control chip electrically connected with the temperature detection circuits.
As an improvement, the temperature detection circuit includes:
the constant current driving circuit is electrically connected with the power supply and is used for providing constant current for the temperature sensor;
the IA instrument amplifier is electrically connected with the output end of the temperature sensor and is used for amplifying weak voltage signals;
the second-order voltage-controlled low-pass filter is electrically connected with the output end of the IA instrument amplifier and is used for eliminating background and circuit noise;
the analog-to-digital converter is electrically connected with the output end of the second-order voltage-controlled low-pass filter and the control chip and is used for converting the analog voltage into a digital signal;
in the temperature detection circuit corresponding to the first temperature sensor, the constant current driving circuit is directly and electrically connected with the first temperature sensor;
in the temperature detection circuit corresponding to the second temperature sensor, the constant current driving circuit is electrically connected with the second temperature sensor through a bridge circuit 7.
As an improvement, the constant current driving circuit comprises a first resistor, a first filter capacitor, a voltage stabilizer, a second super capacitor, a first operational amplifier and a fourteenth resistor;
the first end of the first resistor is connected with a power supply, the second end of the first resistor is electrically connected with the first end of the first filter capacitor, the second end of the first filter capacitor is grounded, the anode of the voltage stabilizer is grounded, the cathode of the voltage stabilizer is electrically connected with the first end of the first capacitor, the reference end of the voltage stabilizer is electrically connected with the anode of the second super capacitor, the cathode of the second super capacitor is grounded, the anode of the second super capacitor is electrically connected with the positive phase end of the first operational amplifier, the negative phase end of the first operational amplifier is electrically connected with the first end of the fourteenth resistor, and the second end of the fourteenth resistor is grounded;
in the temperature detection circuit corresponding to the first temperature sensor, the output end of the voltage stabilizer is electrically connected with the first pin of the first temperature sensor, and the first end of the fourteenth resistor is electrically connected with the second pin of the first temperature sensor;
in the temperature detection circuit corresponding to the second temperature sensor, the bridge circuit 7 includes an eighteenth resistor, a nineteenth resistor and a twenty-first resistor, first ends of the eighteenth resistor and the nineteenth resistor are respectively electrically connected with an output end of the first operational amplifier, a second end of the eighteenth resistor is electrically connected with a first end of the twenty-first resistor, a second end of the twenty-first resistor is electrically connected with a second pin of the second temperature sensor, a second end of the nineteenth resistor is electrically connected with a third pin of the second temperature sensor, and a first end of the fourteenth resistor is electrically connected with a first pin of the second temperature sensor.
As an improvement, the IA instrumentation amplifier includes a second operational amplifier, a third operational amplifier, a fourth operational amplifier, a second resistor, a third resistor, a fourth resistor, a fifth resistor, an eighth resistor, an eleventh resistor, and a twelfth resistor, wherein the second operational amplifier and the third operational amplifier constitute an input stage, and the fourth operational amplifier constitutes an output stage;
a first end of a fourth resistor is electrically connected with an output end of the second operational amplifier, a second end of the fourth resistor is electrically connected with a negative phase input end of the second operational amplifier, a second end of the fourth resistor is electrically connected with a first end of a fifth resistor, a second end of the fifth resistor is electrically connected with a first end of an eighth resistor, one end of the eighth resistor is electrically connected with a negative phase input end of the third operational amplifier, a second end of the eighth resistor is electrically connected with an output end of the third operational amplifier, a first end of the second resistor is electrically connected with an output end of the first operational amplifier, a second end of the second resistor is electrically connected with a first end of a third resistor, a second end of the second resistor is also electrically connected with a steam box input end of the fourth operational amplifier, a second end of the third resistor is grounded, a first end of an eleventh resistor is electrically connected with an output end of the third operational amplifier, a second end of the eleventh resistor is electrically connected with a first end of a twelfth resistor, a second end of the eleventh resistor is also electrically connected with a negative phase input end of the fourth operational amplifier, and a second end of the twelfth resistor is electrically connected with an output end of the fourth operational amplifier;
in the temperature detection circuit corresponding to the first temperature sensor, the positive phase input end of the second operational amplifier is electrically connected with the third pin of the first temperature sensor, and the positive phase input end of the third operational amplifier is electrically connected with the fourth pin of the first temperature sensor;
in the temperature detection circuit corresponding to the second temperature sensor, the positive phase input end of the second operational amplifier is electrically connected with the second end of the nineteenth resistor, and the positive phase input end of the third operational amplifier is electrically connected with the second end of the eighteenth resistor.
As an improvement, the second-order voltage-controlled low-pass filter includes a fifth operational amplifier, a sixth resistor, a seventh resistor, a ninth resistor, a tenth resistor, a thirteenth resistor, a third capacitor, and a fourth capacitor;
the first end of the sixth resistor is electrically connected with the output end of the fourth operational amplifier, the second end of the sixth resistor is electrically connected with the first end of the seventh resistor, the first end of the ninth resistor is electrically connected with the second end of the sixth resistor, the second end of the ninth resistor is grounded, the second end of the seventh resistor is electrically connected with the first end of the fourth capacitor, the second end of the fourth capacitor is grounded, the first end of the fourth capacitor is also electrically connected with the positive-phase input end of the fifth operational amplifier, the negative-phase input end of the fifth operational amplifier is electrically connected with the first end of the thirteenth resistor, the second end of the thirteenth resistor is grounded, the first end of the tenth resistor is electrically connected with the output end of the fifth operational amplifier, the output end of the fifth operational amplifier is electrically connected with the analog-to-digital conversion circuit, the first end of the third capacitor is electrically connected with the second end of the sixth resistor, and the second end of the third capacitor is electrically connected with the output end of the fifth operational amplifier.
As an improvement, the analog-to-digital conversion circuit includes an analog-to-digital conversion chip, and the analog-to-digital conversion chip is an analog-to-digital conversion chip with a model number of CS 1232.
Compared with the prior art, the utility model has the advantages of: the utility model provides a carbon dioxide incubator has set up the temperature sensor of two different temperature detection scope in the box, and two temperature sensor have the detection temperature value that high accuracy low temperature is floated, but self-checking testing result accuracy and stability each other make incubator control system's work more stable. In addition, even if one temperature sensor breaks down in the operation process of the incubator, the set cultivation work can still be stably completed by using the detection work of the other temperature sensor, the stop work caused by incapability of acquiring temperature data is avoided, and the major loss is avoided, so that the reliability of the carbon dioxide incubator is improved.
Drawings
Fig. 1 is a block diagram of a temperature detection circuit corresponding to the first temperature sensor in the embodiment of the present invention.
Fig. 2 is a block diagram of a temperature detection circuit corresponding to the second temperature sensor in the embodiment of the present invention.
FIG. 3 is a circuit diagram of a carbon dioxide incubator according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The carbon dioxide incubator in the embodiment comprises a box body, a control circuit board arranged on the box body, and two temperature sensors which are arranged in the box body and are respectively connected with the control circuit board through electric signals.
One of the temperature sensors is a first temperature sensor 1 used for measuring the temperature of the low-temperature section, and the other temperature sensor is a second temperature sensor 2 used for measuring the temperature of the full-temperature section. In the embodiment, the first temperature sensor 1 adopts a platinum resistor with the model PT1000, the temperature range of the detected low-temperature section is 10-60 ℃, and the second temperature sensor 2 adopts a platinum resistor with the model PT100, and the temperature range of the detected full-temperature section is 0-200 ℃. Wherein first temperature sensor 1 resolution ratio is high, and the temperature value of reading is more accurate, and second temperature sensor 2 can be used to read and compare with the low temperature value that first temperature sensor 1 read, and then realize temperature calibration.
When this carbon dioxide incubator is being used for research modes such as cell, tissue culture, first temperature sensor 1 feeds back to control circuit board as the accurate temperature of measuring 37 ℃ of main temperature sensor, and then control circuit board is based on the control to other working part of carbon dioxide incubator for the temperature in this carbon dioxide incubator is invariably 37 ℃ +/-0.2 ℃ all the time. The second temperature sensor 2 is used as a secondary temperature sensor, the temperature values measured by the second temperature sensor 2 should not differ by more than 1 ℃ and the range is approximately 36.0-38.0 ℃, and if the temperature values exceed the range, the control circuit board judges the temperature detection fault. When the carbon dioxide incubator is running, the control circuit board can analyze and judge according to the curves of the reading values of the two temperature sensors, and the temperature sensors which read the temperature values and control the proportion are in direct proportion are used as the reference to carry out temperature detection work until the work at the current time is finished.
The control circuit board is provided with temperature detection circuits corresponding to the first temperature sensor 1 and the second temperature sensor 2 respectively, and is also provided with a control chip electrically connected with the temperature detection circuits. The temperature detection circuit can effectively, accurately and prevent interference, and converts the detection signals of the two temperature sensors into temperature digital signals, so that the temperature data can be conveniently displayed and utilized for control.
As shown in fig. 1 to 3, the temperature detection circuit includes a constant current drive circuit 3, an IA instrumentation amplifier 4, a second-order voltage-controlled low-pass filter 5, and an analog-to-digital converter 6.
The constant current driving circuit 3 is electrically connected with a power supply and is used for providing constant current for the temperature sensor. The IA instrument amplifier 4 is electrically connected with the output end of the temperature sensor, is used for amplifying weak voltage signals and high common mode rejection ratio, and is used for amplifying the signals to proper electrical signal values according to the electrical signals entering the amplifier. The second-order voltage-controlled low-pass filter 5 is electrically connected with the output end of the IA instrument amplifier 4, and is used for filtering a certain quality control factor according to an electric signal entering the second-order voltage-controlled filter circuit and eliminating background and circuit noise. The analog-to-digital converter 6 is electrically connected with the output end of the second-order voltage-controlled low-pass filter 5 and the control chip, and is used for converting the analog voltage into a digital signal, so that the corresponding temperature value can be obtained by utilizing the calculation of the control chip.
Since the first temperature sensor 1 has high detection accuracy, the constant current driving circuit 3 may be directly electrically connected to the first temperature sensor 1 in the temperature detection circuit corresponding to the first temperature sensor 1. The temperature detection range of the second temperature sensor 2 is large, and the temperature detection precision is relatively low, so that in the temperature detection circuit corresponding to the second temperature sensor 2, the constant current driving circuit 3 is electrically connected with the second temperature sensor 2 through the bridge circuit 7, the resolution of the second temperature sensor 2 can be improved through the bridge circuit 7, and the detection precision is further improved. The constant current output by the constant current driving circuit 3 drives the bridge circuit 7, so that interference signals are reduced, and the detection temperature of the second temperature sensor 2 in a larger range can be realized.
Specifically, the constant current driving circuit 3 includes first resistors R1, R1', first filter capacitors C1, C1', voltage regulators U8, U8', second super capacitors C2, C2', first operational amplifiers U1, U1', fourteenth resistors R14, R14'. The first ends of the first resistors R1 and R1 'are connected with a power supply, the second ends of the first resistors R1 and R1' are electrically connected with the first ends of the first filter capacitors C1 and C1', the second ends of the first filter capacitors C1 and C1' are grounded, the anodes of the voltage stabilizers U8 and U8 'are grounded, the cathodes of the voltage stabilizers U8 and U8' are electrically connected with the first ends of the first capacitors, the reference ends of the voltage stabilizers U8 and U8 'are electrically connected with the anodes of the second super capacitors C2 and C2', the cathodes of the second super capacitors C2 and C2 'are grounded, the anodes of the second super capacitors C2 and C2' are electrically connected with the positive phase ends of the first operational amplifiers U1 and U1', the negative phase ends of the first operational amplifiers U1 and U1' are electrically connected with the first ends of the fourteenth resistors R14 and R14', and the second ends of the fourteenth resistors R14 and R14' are grounded.
In the temperature detection circuit corresponding to the first temperature sensor 1, the output end of the voltage stabilizer U8 is electrically connected to the first pin of the first temperature sensor 1, and the first end of the fourteenth resistor R14 is electrically connected to the second pin of the first temperature sensor 1.
In the temperature detection circuit corresponding to the second temperature sensor 2, the bridge circuit 7 includes an eighteenth resistor R18, a nineteenth resistor R19, and a twenty-first resistor R21, first ends of the eighteenth resistor R18 and the nineteenth resistor R19 are respectively electrically connected to an output end of the first operational amplifier U1', a second end of the eighteenth resistor R18 is electrically connected to a first end of the twenty-first resistor R21, a second end of the twenty-first resistor R21 is electrically connected to a second pin of the second temperature sensor 2, a second end of the nineteenth resistor R19 is electrically connected to a third pin of the second temperature sensor 2, and a first end of the fourteenth resistor R14' is electrically connected to a first pin of the second temperature sensor 2.
The IA instrumentation amplifier 4 includes a second operational amplifier U2, U2', a third operational amplifier U3, U3', a fourth operational amplifier U4, U4', a second resistor R2, R2', a third resistor R3, R3', a fourth resistor R4, R4', a fifth resistor R5, R5', an eighth resistor R8, R8', an eleventh resistor R11, R11', a twelfth resistor R12, R12', wherein the second operational amplifier U2, U2', the third operational amplifier U3, U3' form an input stage, and the fourth operational amplifier U4, U4' form an output stage.
First ends of fourth resistors R4, R4' are electrically connected to output ends of the second operational amplifiers U2, U2', second ends of the fourth resistors R4, R4' are electrically connected to negative phase input ends of the second operational amplifiers U2, U2', second ends of the fourth resistors R4, R4' are electrically connected to first ends of the fifth resistors R5, R5', second ends of the fifth resistors R5, R5' are electrically connected to first ends of the eighth resistors R8, R8', one ends of the eighth resistors R8, R8' are electrically connected to negative phase input ends of the third operational amplifiers U3, U3', second ends of the eighth resistors R8, R8' are electrically connected to output ends of the third operational amplifiers U3, U3', first ends of the second resistors R2, R2' are electrically connected to output ends of the first operational amplifiers U1, U1', second ends of the second resistors R2, R2' are electrically connected to third terminals R3, R3', second ends of the second resistors R2, R2', the eleventh terminals of the fourth resistors R4, R12', the twelfth terminals of the fourth resistors R4', the operational amplifiers U3', the twelfth resistors R4', the twelfth terminals are electrically connected to the output ends of the eleventh resistors R4, R12', the twelfth resistors R4', the twelfth resistors R12', the eleventh terminals of the fourth operational amplifiers U3, R4', and the twelfth resistors R4' are electrically connected to the output ends of the twelfth resistors R4' are electrically connected to the twelfth resistors R12.
In the temperature detection circuit corresponding to the first temperature sensor 1, the positive phase input end of the second operational amplifier U2 is electrically connected to the third pin of the first temperature sensor 1, and the positive phase input end of the third operational amplifier U3 is electrically connected to the fourth pin of the first temperature sensor 1.
In the temperature detection circuit corresponding to the second temperature sensor 2, the positive-phase input terminal of the second operational amplifier U2 'is electrically connected to the second terminal of the nineteenth resistor R19, and the positive-phase input terminal of the third operational amplifier U3' is electrically connected to the second terminal of the eighteenth resistor R18.
The second-order voltage-controlled low-pass filter 5 includes fifth operational amplifiers U5, U5', sixth resistors R6, R6', seventh resistors R7, R7', ninth resistors R9, R9', tenth resistors R10, R10', thirteenth resistors R13, R13', third capacitors C3, C3', and fourth capacitors C4, C4'.
First ends of sixth resistors R6 and R6' are electrically connected to output ends of fourth operational amplifiers U4 and U4', second ends of the sixth resistors R6 and R6' are electrically connected to first ends of seventh resistors R7 and R7', first ends of ninth resistors R9 and R9' are electrically connected to second ends of the sixth resistors R6 and R6', second ends of the ninth resistors R9 and R9' are grounded, second ends of the seventh resistors R7 and R7' are electrically connected to first ends of fourth capacitors C4 and C4', second ends of the fourth capacitors C4 and C4' are grounded, first ends of the fourth capacitors C4 and C4' are also electrically connected to positive input ends of the fifth operational amplifiers U5 and U5', negative input ends of the fifth operational amplifiers U5 and U5' are electrically connected to first ends of thirteenth resistors R13 and R13', second ends of the thirteenth resistors R13 and R13' are grounded, second ends of the tenth resistors R10 and R10' are electrically connected to output ends of the fifth operational amplifiers U5 and U5', third resistors R5' and R3', third ends of the operational amplifiers U5 and R6' are electrically connected to output ends of the fifth operational amplifiers U5 and U3', and R3' are electrically connected to output ends of the third capacitors C5 and R6' and the analog-to the output ends of the analog-to the analog-digital converter.
The analog-to-digital converter 6 comprises an analog-to-digital conversion chip, and the analog-to-digital conversion chip is an analog-to-digital conversion chip with the model number of CS 1232.
The constant current driving circuit 3 is used for providing constant current for the first temperature sensor 1 and the second temperature sensor 2, the output current I of the constant current driving circuit 3 is determined by the reference voltage REF1 of the voltage stabilizing ends of the first voltage stabilizers U8 and U8', the first operational amplifiers U1 and U1' and the sampling resistor R14, and the value is as follows: i = REF1/R14, because the self-heating factors of the first temperature sensor 1 and the second temperature sensor 2 cause inaccurate measurement, a constant current of 1.25mA is designed and selected, so that a very precise gain is achieved by the resistors of the high-precision low-temperature drift through the weak voltage difference between the two ends of the first temperature sensor 1 and the second temperature sensor 2, and the voltage signal is preliminarily amplified, in some embodiments, the IA instrumentation amplifier 4 uses the resistors of the high-precision low-temperature drift, the gain a is determined by the second operational amplifier U2, U2', the third operational amplifier U3, U3', the fourth operational amplifier U4, U4', the second resistor R2, R2', the third resistor R3, R3', the fourth resistor R4, R4', the fifth resistor R5, R5', and has a value: a = (1 +2 R4/R5) ((R3/R2)), and the CMRR is maximized by properly adjusting the second resistors R2 and R2', so that the gain requirement of the IA instrumentation amplifier 4 of the design is met.
In the second-order voltage-controlled low-pass filter circuit, seventh resistors R7 and R7' and fourth capacitors C4 and C4' are connected in parallel to form a low-pass filter, fifth operational amplifiers U5 and U5' can select AD8552 chips, and the second-order voltage-controlled filter circuit with the frequency of 1KHz and the quality factor of 5 is constructed through parameter setting of all parts.
Because the temperature detection of carbon dioxide incubator is very important, will probably cause great loss when breaking down, in order to avoid this condition to take place, adopt two way temperature detection circuit, carry out the double-circuit temperature measurement to first temperature sensor 1, second temperature sensor 2 respectively, both guaranteed high accuracy sampling, temperature accuracy, the most important simultaneously is the problem of preventing the temperature out of control when the system is moving.
On the control circuit board, to achieve the isolation of analog signals and digital signals, the analog signals are wrapped by an analog ground, the reference ground level pressure difference is 0 as much as possible, the measurement is more accurate and reliable, the radiation interference can be absorbed, and the high-frequency crosstalk is prevented. The digital signal is digitally wrapped to prevent interference with, in particular, high-precision analog signals, while making the quality of the communication signal more stable and robust.
The utility model provides a carbon dioxide incubator has set up the temperature sensor of two different temperature detection scope in the box, and two temperature sensor have the detection temperature value that high accuracy low temperature is floated, but self-checking testing result accuracy and stability each other make incubator control system's work more stable. In addition, even if one temperature sensor breaks down in the operation process of the incubator, the set cultivation work can still be stably completed by using the detection work of the other temperature sensor, the stop work caused by incapability of acquiring temperature data is avoided, and the major loss is avoided, so that the reliability of the carbon dioxide incubator is improved.
Claims (9)
1. The utility model provides a carbon dioxide incubator, includes the box, sets up the control circuit board on the box, its characterized in that: the temperature sensor is a first temperature sensor used for measuring the temperature of the low-temperature section, and the other temperature sensor is a second temperature sensor used for measuring the temperature of the full-temperature section.
2. The carbon dioxide incubator of claim 1, wherein: the temperature range of the low-temperature section detected by the first temperature sensor is 10-60 ℃; the temperature range of the full-temperature section detected by the second temperature sensor is 0-200 ℃.
3. The carbon dioxide incubator of claim 1, wherein: the first temperature sensor adopts a platinum resistor with the model PT1000, and the second temperature sensor adopts a platinum resistor with the model PT 100.
4. A carbon dioxide incubator according to any one of claims 1 to 3, wherein: the control circuit board is provided with temperature detection circuits corresponding to the first temperature sensor and the second temperature sensor respectively, and is also provided with a control chip electrically connected with the temperature detection circuits.
5. The carbon dioxide incubator of claim 4, wherein: the temperature detection circuit includes:
the constant current driving circuit is electrically connected with the power supply and is used for providing constant current for the temperature sensor;
the IA instrument amplifier is electrically connected with the output end of the temperature sensor and is used for amplifying a weak voltage signal;
the second-order voltage-controlled low-pass filter is electrically connected with the output end of the IA instrument amplifier and is used for eliminating background and circuit noise;
the analog-to-digital converter is electrically connected with the output end of the second-order voltage-controlled low-pass filter and the control chip and is used for converting the analog voltage into a digital signal;
in the temperature detection circuit corresponding to the first temperature sensor, the constant current driving circuit is directly and electrically connected with the first temperature sensor;
in the temperature detection circuit corresponding to the second temperature sensor, the constant current driving circuit is electrically connected with the second temperature sensor through a bridge circuit 7.
6. The carbon dioxide incubator according to claim 5, wherein: the constant current driving circuit comprises a first resistor, a first filter capacitor, a voltage stabilizer, a second super capacitor, a first operational amplifier and a fourteenth resistor;
the first end of the first resistor is connected with a power supply, the second end of the first resistor is electrically connected with the first end of the first filter capacitor, the second end of the first filter capacitor is grounded, the anode of the voltage stabilizer is grounded, the cathode of the voltage stabilizer is electrically connected with the first end of the first capacitor, the reference end of the voltage stabilizer is electrically connected with the anode of the second super capacitor, the cathode of the second super capacitor is grounded, the anode of the second super capacitor is electrically connected with the positive phase end of the first operational amplifier, the negative phase end of the first operational amplifier is electrically connected with the first end of the fourteenth resistor, and the second end of the fourteenth resistor is grounded;
in the temperature detection circuit corresponding to the first temperature sensor, the output end of the voltage stabilizer is electrically connected with the first pin of the first temperature sensor, and the first end of the fourteenth resistor is electrically connected with the second pin of the first temperature sensor;
in the temperature detection circuit corresponding to the second temperature sensor, the bridge circuit 7 includes an eighteenth resistor, a nineteenth resistor and a twenty-first resistor, first ends of the eighteenth resistor and the nineteenth resistor are respectively electrically connected with an output end of the first operational amplifier, a second end of the eighteenth resistor is electrically connected with a first end of the twenty-first resistor, a second end of the twenty-first resistor is electrically connected with a second pin of the second temperature sensor, a second end of the nineteenth resistor is electrically connected with a third pin of the second temperature sensor, and a first end of the fourteenth resistor is electrically connected with a first pin of the second temperature sensor.
7. The carbon dioxide incubator according to claim 6, wherein: the IA instrumentation amplifier comprises a second operational amplifier, a third operational amplifier, a fourth operational amplifier, a second resistor, a third resistor, a fourth resistor, a fifth resistor, an eighth resistor, an eleventh resistor and a twelfth resistor, wherein the second operational amplifier and the third operational amplifier form an input stage, and the fourth operational amplifier forms an output stage;
the first end of a fourth resistor is electrically connected with the output end of the second operational amplifier, the second end of the fourth resistor is electrically connected with the negative phase input end of the second operational amplifier, the second end of the fourth resistor is electrically connected with the first end of a fifth resistor, the second end of the fifth resistor is electrically connected with the first end of an eighth resistor, one end of the eighth resistor is electrically connected with the negative phase input end of the third operational amplifier, the second end of the eighth resistor is electrically connected with the output end of the third operational amplifier, the first end of the second resistor is electrically connected with the output end of the first operational amplifier, the second end of the second resistor is electrically connected with the first end of a third resistor, the second end of the second resistor is also electrically connected with the steam box input end of the fourth operational amplifier, the second end of the third resistor is grounded, the first end of an eleventh resistor is electrically connected with the output end of the third operational amplifier, the second end of the eleventh resistor is electrically connected with the first end of a twelfth resistor, the second end of the eleventh resistor is also electrically connected with the negative phase input end of the fourth operational amplifier, and the second end of the twelfth resistor is electrically connected with the output end of the fourth operational amplifier;
in the temperature detection circuit corresponding to the first temperature sensor, the positive phase input end of the second operational amplifier is electrically connected with the third pin of the first temperature sensor, and the positive phase input end of the third operational amplifier is electrically connected with the fourth pin of the first temperature sensor;
in the temperature detection circuit corresponding to the second temperature sensor, the positive phase input end of the second operational amplifier is electrically connected with the second end of the nineteenth resistor, and the positive phase input end of the third operational amplifier is electrically connected with the second end of the eighteenth resistor.
8. The carbon dioxide incubator of claim 7, wherein: the second-order voltage-controlled low-pass filter comprises a fifth operational amplifier, a sixth resistor, a seventh resistor, a ninth resistor, a tenth resistor, a thirteenth resistor, a third capacitor and a fourth capacitor;
the first end of the sixth resistor is electrically connected with the output end of the fourth operational amplifier, the second end of the sixth resistor is electrically connected with the first end of the seventh resistor, the first end of the ninth resistor is electrically connected with the second end of the sixth resistor, the second end of the ninth resistor is grounded, the second end of the seventh resistor is electrically connected with the first end of the fourth capacitor, the second end of the fourth capacitor is grounded, the first end of the fourth capacitor is further electrically connected with the positive-phase input end of the fifth operational amplifier, the negative-phase input end of the fifth operational amplifier is electrically connected with the first end of the thirteenth resistor, the second end of the thirteenth resistor is grounded, the first end of the tenth resistor is electrically connected with the output end of the fifth operational amplifier, the output end of the fifth operational amplifier is electrically connected with the analog-to-digital conversion circuit, the first end of the third capacitor is electrically connected with the second end of the sixth resistor, and the second end of the third capacitor is electrically connected with the output end of the fifth operational amplifier.
9. The carbon dioxide incubator of claim 5, wherein: the analog-to-digital conversion circuit comprises an analog-to-digital conversion chip, and the analog-to-digital conversion chip is an analog-to-digital conversion chip with the model number of CS 1232.
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| CN202221690052.2U CN218539708U (en) | 2022-06-30 | 2022-06-30 | Carbon dioxide incubator |
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| CN202221690052.2U CN218539708U (en) | 2022-06-30 | 2022-06-30 | Carbon dioxide incubator |
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