CN213956601U - Input processing circuit for platinum thermal sensor acquisition - Google Patents
Input processing circuit for platinum thermal sensor acquisition Download PDFInfo
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- CN213956601U CN213956601U CN202120229647.7U CN202120229647U CN213956601U CN 213956601 U CN213956601 U CN 213956601U CN 202120229647 U CN202120229647 U CN 202120229647U CN 213956601 U CN213956601 U CN 213956601U
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Abstract
The utility model discloses an input processing circuit for platinum thermal sensor collection, which comprises an input end, a voltage stabilizing circuit, a filter circuit, a zero adjusting circuit, a differential amplifying circuit, a full scale adjusting circuit and an output end; the input end is electrically connected with the voltage stabilizing circuit, the voltage stabilizing circuit is electrically connected with the filter circuit, the filter circuit is electrically connected with the zero point adjusting circuit, the zero point adjusting circuit is electrically connected with the differential amplifying circuit, the differential amplifying circuit is electrically connected with the full scale adjusting circuit, and the full scale adjusting circuit is electrically connected with the output end; the filter circuit comprises a platinum thermal sensor R8; the application aims at providing an input processing circuit for collection of a platinum thermal sensor, which can convert temperature change conditions into voltage change in time.
Description
Technical Field
The utility model relates to a temperature detect circuit field especially relates to an input processing circuit for platinum heat sensor gathers.
Background
In electronic devices, as the technology for manufacturing components has been developed, the integration level of components has been gradually increased. The higher the integration degree of the components is, the higher the heat generated by the electronic equipment during working is, and the performance or damage of the components may be reduced by the excessive heat, so that certain potential safety hazards exist.
The existing mode for preventing the temperature in the equipment from being too high generally adopts a physical heat radiation mode, and meanwhile, the mode is combined with a temperature detection unit to detect the temperature, and when the temperature detection unit detects that the temperature of the equipment is too high, early warning or stop working is carried out. However, the existing temperature detection unit has the condition of inaccurate detection, when the temperature fluctuates, detection errors are easy to generate, the feedback of the equipment temperature is seriously influenced, and the work of components and parts is still influenced due to overhigh temperature.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an input processing circuit for platinum heat sensor gathers can in time turn into the change of voltage with the temperature variation condition.
To achieve the purpose, the utility model adopts the following technical proposal: an input processing circuit for platinum thermal sensor acquisition comprises an input end, a voltage stabilizing circuit, a filter circuit, a zero point adjusting circuit, a differential amplifying circuit, a full scale adjusting circuit and an output end; the input end is electrically connected with the voltage stabilizing circuit, the voltage stabilizing circuit is electrically connected with the filter circuit, the filter circuit is electrically connected with the zero point adjusting circuit, the zero point adjusting circuit is electrically connected with the differential amplifying circuit, the differential amplifying circuit is electrically connected with the full scale adjusting circuit, and the full scale adjusting circuit is electrically connected with the output end; the filter circuit includes a platinum thermal sensor R8.
Preferably, the voltage stabilizing circuit comprises a resistor R1, a voltage regulator tube U1, a resistor R4 and a resistor R9; one end of the resistor R1 is electrically connected with the input end, the other end of the resistor R1 is electrically connected with a pin 3 of the voltage regulator tube U1, the resistor R4 is connected in parallel between a pin 1 of the voltage regulator tube U1 and a pin 3 of the voltage regulator tube U1, the resistor R9 is connected in parallel between a pin 1 of the voltage regulator tube U1 and a pin 2 of the voltage regulator tube U1, and a pin 2 of the voltage regulator tube U1 is grounded.
Preferably, the chip model of the voltage regulator tube U1 is TL 431.
Preferably, the filter circuit further comprises a resistor R5 and a capacitor C1; one end of the resistor R5 is electrically connected with a pin 3 of the voltage regulator tube U1, the other end of the resistor R5 is electrically connected with one end of the platinum heat sensor R8, the other end of the platinum heat sensor R8 is grounded, and the capacitor C1 is connected in parallel at two ends of the platinum heat sensor R8.
Preferably, the zero point adjusting circuit comprises a resistor R3, an adjustable resistor RP1, a resistor R6 and a resistor R10; one end of the resistor R3 is electrically connected with a pin 3 of the voltage regulator tube U1, the other end of the resistor R3 is electrically connected with one end of the adjustable resistor RP1, the other end of the adjustable resistor RP1 is electrically connected with one end of the resistor R10, the other end of the resistor R10 is grounded, one end of the resistor R6 is electrically connected with a sliding end of the adjustable resistor RP1, and the other end of the resistor R6 is electrically connected with the differential amplifying circuit.
Preferably, the differential amplifying circuit includes a resistor R2, a resistor R7, a resistor R11, and an operational amplifier; one end of the resistor R2 is electrically connected with a pin 2 of the operational amplifier, the other end of the resistor R2 is electrically connected with the full-scale adjusting circuit, one end of the resistor R7 is electrically connected with one end of the platinum thermal sensor R8, the other end of the resistor R7 is electrically connected with a pin 3 of the operational amplifier, one end of the resistor R11 is electrically connected with the pin 3 of the operational amplifier, and the other end of the resistor R11 is grounded.
Preferably, the full-scale adjustment circuit comprises an adjustable resistor RP2, a resistor R12 and a resistor R13; one end of the adjustable resistor RP2 is electrically connected with pin 1 of the operational amplifier, the other end of the adjustable resistor RP2 and the adjustable resistor RP2 are electrically connected with one end of the resistor R12, the other end of the resistor R12 is electrically connected with one end of the resistor R13, and the other end of the resistor R13 is grounded.
This application adopts this kind of structure, and through the drive mode that platinum thermal sensor R8 becomes constant voltage circuit with voltage stabilizing circuit, filter circuit, zero adjustment circuit, differential amplifier circuit and full scale regulating circuit cooperation, it is high to have the regulation precision, and sensitivity is high, and output is stable, can in time turn into the change of voltage with the temperature change condition.
Drawings
The accompanying drawings are provided to further illustrate the present invention, but the content in the accompanying drawings does not constitute any limitation to the present invention.
Fig. 1 is a schematic circuit diagram of the present invention.
Wherein: the circuit comprises an input end 1, a voltage stabilizing circuit 2, a filter circuit 3, a zero point adjusting circuit 4, a differential amplifying circuit 5, a full scale adjusting circuit 6 and an output end 7.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
Referring to fig. 1, an input processing circuit for platinum thermal sensor acquisition includes an input terminal 1, a voltage stabilizing circuit 2, a filter circuit 3, a zero adjustment circuit 4, a differential amplification circuit 5, a full scale adjustment circuit 6 and an output terminal 7; the input end 1 is electrically connected with the voltage stabilizing circuit 2, the voltage stabilizing circuit 2 is electrically connected with the filter circuit 3, the filter circuit 3 is electrically connected with the zero point adjusting circuit 4, the zero point adjusting circuit 4 is electrically connected with the differential amplifying circuit 5, the differential amplifying circuit 5 is electrically connected with the full scale adjusting circuit 6, and the full scale adjusting circuit 6 is electrically connected with the output end 7; the filter circuit 3 includes a platinum heat sensor R8.
By adopting the structure, the platinum thermal sensor R8 is matched with the voltage stabilizing circuit 2, the filter circuit 3, the zero point adjusting circuit 4, the differential amplifying circuit 5 and the full scale adjusting circuit 6 to form a driving mode of a constant voltage circuit, the acquired temperature range is 0-500 ℃ and is converted into 0-5V voltage, and the sensitivity is 1.395 Mv/DEG C. The temperature-controlled switch has the advantages of high adjustment precision, high sensitivity and stable output, and can convert the temperature change condition into the voltage change in time.
Preferably, the voltage stabilizing circuit 2 comprises a resistor R1, a voltage regulator tube U1, a resistor R4 and a resistor R9; one end of the resistor R1 is electrically connected with the input end 1, the other end of the resistor R1 is electrically connected with a pin 3 of the voltage regulator tube U1, the resistor R4 is connected in parallel between the pin 1 of the voltage regulator tube U1 and the pin 3 of the voltage regulator tube U1, the resistor R9 is connected in parallel between the pin 1 of the voltage regulator tube U1 and the pin 2 of the voltage regulator tube U1, and the pin 2 of the voltage regulator tube U1 is grounded.
Meanwhile, the model number of the chip of the voltage regulator tube U1 is TL 431.
In this embodiment, the power supply used is positive 15V and negative 15V. The input end 1 is connected with a forward power supply, a voltage division branch circuit is formed by the resistor R4 and the resistor R9, a stable voltage 2.5V is formed between the resistor R4 and the resistor R9, a stable voltage output is formed at a node A, the voltage is matched with the adjustable potentiometer RP1, the resistor R3 and the resistor R10 to form a voltage division circuit, and a stable voltage division zero setting circuit is formed at a node C. Considering the influence of the temperature coefficient, the model number of the chip of the voltage regulator tube U1 is TL431, and the temperature coefficient of the TL431 is 50 PPM/DEG C.
Specifically, the filter circuit 3 further includes a resistor R5 and a capacitor C1; one end of the resistor R5 is electrically connected with a pin 3 of the voltage regulator tube U1, the other end of the resistor R5 is electrically connected with one end of the platinum heat sensor R8, the other end of the platinum heat sensor R8 is grounded, and the capacitor C1 is connected in parallel at two ends of the platinum heat sensor R8.
With the structure, the resistor R5 has a voltage division function, and the capacitor C1 has a filtering function, so that the voltage passing through the platinum thermal sensor R8 is kept stable.
Preferably, the zero point adjusting circuit 4 includes a resistor R3, an adjustable resistor RP1, a resistor R6, and a resistor R10; one end of the resistor R3 is electrically connected to the pin 3 of the regulator tube U1, the other end of the resistor R3 is electrically connected to one end of the adjustable resistor RP1, the other end of the adjustable resistor RP1 is electrically connected to one end of the resistor R10, the other end of the resistor R10 is grounded, one end of the resistor R6 is electrically connected to the sliding end of the adjustable resistor RP1, and the other end of the resistor R6 is electrically connected to the differential amplifier circuit 5.
In the present application, the resistor R3 is electrically connected to pin 3 of the adjustable resistor RP1, one end of the resistor R10 is electrically connected to pin 1 of the adjustable resistor RP1, and the other end is grounded. To avoid the influence of the bridge circuit resistance, the resistor R6 is selected to have a size of about 1M.
In the present application, the differential amplification circuit 5 includes a resistor R2, a resistor R7, a resistor R11, and an operational amplifier; one end of the resistor R2 is electrically connected with a pin 2 of the operational amplifier, the other end of the resistor R2 is electrically connected with the full scale adjusting circuit 6, one end of the resistor R7 is electrically connected with one end of the platinum thermal sensor R8, the other end of the resistor R7 is electrically connected with a pin 3 of the operational amplifier, one end of the resistor R11 is electrically connected with the pin 3 of the operational amplifier, and the other end of the resistor R11 is grounded.
In this embodiment, in order to avoid the influence of the resistance of the bridge circuit, the resistor R7 is selected to be about 1M, and since the input signal is small, the adjustable resistor RP2, the resistor R12 and the resistor R13 form a gain circuit, and the adjustable potentiometer RP2 is used to adjust the full-scale range.
Preferably, the full-scale adjusting circuit 6 comprises an adjustable resistor RP2, a resistor R12 and a resistor R13; one end of the adjustable resistor RP2 is electrically connected with pin 1 of the operational amplifier, the other end of the adjustable resistor RP2 and the adjustable resistor RP2 are electrically connected with one end of the resistor R12, the other end of the resistor R12 is electrically connected with one end of the resistor R13, and the other end of the resistor R13 is grounded.
By adopting the structure, the temperature sensitivity of the platinum thermal sensor R8 is low, the amplification gain can be precisely adjusted according to the error of the resistor, and the selection type of the operational amplifier adopts a field effect transistor input type operational amplifier with low input bias current.
A positive and negative power supply 15V was provided on the board and a platinum thermal sensor with a resistance of about 1K c was connected to node B. The voltage at the node A can be seen to be a stable voltage source on an oscilloscope, the voltage can be tested by the oscilloscope at the positive input end of the operational amplifier according to the influence of the temperature of the platinum thermal sensor, the voltage of different temperature outputs is observed by the oscilloscope at the node E, and the voltage is in proportion to the sensitivity and the temperature, and then the voltage is corrected by the existing software and can be normally used.
The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.
Claims (7)
1. An input processing circuit for platinum thermal sensor collection is characterized by comprising an input end, a voltage stabilizing circuit, a filter circuit, a zero point adjusting circuit, a differential amplifying circuit, a full scale adjusting circuit and an output end;
the input end is electrically connected with the voltage stabilizing circuit, the voltage stabilizing circuit is electrically connected with the filter circuit, the filter circuit is electrically connected with the zero point adjusting circuit, the zero point adjusting circuit is electrically connected with the differential amplifying circuit, the differential amplifying circuit is electrically connected with the full scale adjusting circuit, and the full scale adjusting circuit is electrically connected with the output end;
the filter circuit includes a platinum thermal sensor R8.
2. The input processing circuit for platinum thermal sensor collection according to claim 1, wherein said voltage regulator circuit comprises a resistor R1, a voltage regulator tube U1, a resistor R4 and a resistor R9;
one end of the resistor R1 is electrically connected with the input end, the other end of the resistor R1 is electrically connected with a pin 3 of the voltage regulator tube U1, the resistor R4 is connected in parallel between a pin 1 of the voltage regulator tube U1 and a pin 3 of the voltage regulator tube U1, the resistor R9 is connected in parallel between a pin 1 of the voltage regulator tube U1 and a pin 2 of the voltage regulator tube U1, and a pin 2 of the voltage regulator tube U1 is grounded.
3. The input processing circuit for platinum heat sensor collection according to claim 2, wherein said voltage regulator tube U1 has a chip model number TL 431.
4. The input processing circuit for platinum thermal sensor collection of claim 2, wherein said filter circuit further comprises a resistor R5 and a capacitor C1;
one end of the resistor R5 is electrically connected with a pin 3 of the voltage regulator tube U1, the other end of the resistor R5 is electrically connected with one end of the platinum heat sensor R8, the other end of the platinum heat sensor R8 is grounded, and the capacitor C1 is connected in parallel at two ends of the platinum heat sensor R8.
5. The input processing circuit for platinum thermal sensor collection according to claim 4, wherein said zero point adjustment circuit comprises a resistor R3, an adjustable resistor RP1, a resistor R6 and a resistor R10;
one end of the resistor R3 is electrically connected with a pin 3 of the voltage regulator tube U1, the other end of the resistor R3 is electrically connected with one end of the adjustable resistor RP1, the other end of the adjustable resistor RP1 is electrically connected with one end of the resistor R10, the other end of the resistor R10 is grounded, one end of the resistor R6 is electrically connected with a sliding end of the adjustable resistor RP1, and the other end of the resistor R6 is electrically connected with the differential amplifying circuit.
6. The input processing circuit for platinum thermal sensor collection according to claim 5, wherein said differential amplification circuit comprises a resistor R2, a resistor R7, a resistor R11 and an operational amplifier;
one end of the resistor R2 is electrically connected with a pin 2 of the operational amplifier, the other end of the resistor R2 is electrically connected with the full-scale adjusting circuit, one end of the resistor R7 is electrically connected with one end of the platinum thermal sensor R8, the other end of the resistor R7 is electrically connected with a pin 3 of the operational amplifier, one end of the resistor R11 is electrically connected with the pin 3 of the operational amplifier, and the other end of the resistor R11 is grounded.
7. The input processing circuit for platinum thermal sensor collection according to claim 6, wherein said full scale adjustment circuit comprises an adjustable resistor RP2, a resistor R12, and a resistor R13;
one end of the adjustable resistor RP2 is electrically connected with pin 1 of the operational amplifier, the other end of the adjustable resistor RP2 and the adjustable resistor RP2 are electrically connected with one end of the resistor R12, the other end of the resistor R12 is electrically connected with one end of the resistor R13, and the other end of the resistor R13 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120229647.7U CN213956601U (en) | 2021-01-27 | 2021-01-27 | Input processing circuit for platinum thermal sensor acquisition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120229647.7U CN213956601U (en) | 2021-01-27 | 2021-01-27 | Input processing circuit for platinum thermal sensor acquisition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213956601U true CN213956601U (en) | 2021-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120229647.7U Active CN213956601U (en) | 2021-01-27 | 2021-01-27 | Input processing circuit for platinum thermal sensor acquisition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213956601U (en) |
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2021
- 2021-01-27 CN CN202120229647.7U patent/CN213956601U/en active Active
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