CN218973682U - Large-range temperature sensor simulator - Google Patents
Large-range temperature sensor simulator Download PDFInfo
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- CN218973682U CN218973682U CN202222155609.9U CN202222155609U CN218973682U CN 218973682 U CN218973682 U CN 218973682U CN 202222155609 U CN202222155609 U CN 202222155609U CN 218973682 U CN218973682 U CN 218973682U
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Abstract
The utility model discloses a large-range temperature sensor simulator, which comprises a resistor detection circuit formed by connecting a plurality of precision resistors with different resistance values in series, wherein a relay is arranged on one side of each precision resistor in parallel, meanwhile, a control signal is sent to a transistor array through a control module, and the switching of the relays connected with one side of the different precision resistors in parallel is respectively controlled through the transistor array, so that the precision resistors are controlled to be short-circuited or connected into the resistor detection circuit through the relay, the number and the resistance value of the precision resistors finally connected into the resistor detection circuit are regulated and controlled, different output resistors are flexibly combined, the range of the output resistors is effectively increased, the temperature of a larger range can be detected, meanwhile, the stepped fault jump of the resistor is avoided, and the accuracy of temperature detection is further improved.
Description
Technical Field
The utility model belongs to the technical field of resistance type temperature sensors, and particularly relates to a large-range temperature sensor simulator.
Background
In the aircraft fuel measurement system, in order to ensure the fuel measurement precision, a fuel measurement computer collects a temperature sensor signal to compensate the fuel calculation, the temperature sensor adopts a resistance type sensor, and the temperature of the fuel can be calculated through the fuel measurement computer by detecting the output resistance of the sensor and according to the functional correspondence between the output resistance value and the temperature.
However, in the ground detection or test of the traditional aircraft fuel measurement computer, the resistance value signal sent by the resistance type temperature sensor needs to be simulated, and the current general simulation method is to use 3 fixed resistors to respectively correspond to the low temperature, normal temperature and high temperature states of the simulation temperature sensor. This has the disadvantage that only the values of a few points of the temperature sensor can be simulated, but not the full range simulation of the operating state of the temperature sensor. Meanwhile, the resistance transitions among the limited resistors are larger, so that the temperature accuracy of final detection is insufficient.
Disclosure of Invention
The utility model aims to provide a large-range temperature sensor simulator which can flexibly and widely adjust the output resistance value of a resistance part in a temperature sensor so as to adapt to larger-range temperature detection.
The utility model is realized by the following technical scheme:
the utility model provides a large scale temperature sensor simulator, includes control module and the control drive unit who is connected with control module, still includes a plurality of accurate resistance that establish ties in proper order the resistance is different, control drive unit includes transistor array and relay, transistor array's input is connected with control module and is used for receiving control module's level signal, transistor array's output is connected with the relay and is used for controlling the disconnection or the closure of relay, the relay sets up in each accurate resistance one side and is used for the closed short circuit accurate resistance.
And a control signal is sent to a transistor array in the control driving unit through the control module, and then a high-level or low-level signal is sent to the relay through the output end of the transistor array. When the transistor array outputs a high-level signal to the relay, the relay is closed to enable the precision resistor connected with the relay in parallel to be short-circuited, and the short-circuited precision resistor is not connected with other non-short-circuited precision resistors in series. When the transistor array outputs a low-level signal to the relay, the relay is disconnected, and the precision resistor is normally connected with other non-short-circuit precision resistors in series. The level signal is output to the relay on one side of the corresponding precise resistor, the number of the serially connected precise resistors is controlled, different resistance output is achieved through serial connection of the precise resistors with different numbers of different resistance values, temperature detection is achieved through the corresponding relation between the output resistance value and the temperature, and meanwhile the wider output resistance value is covered, so that the finally detected temperature range and accuracy are improved.
Compared with the traditional resistance type temperature sensor, the resistance type temperature sensor has the advantages that three resistors with fixed resistance values are only arranged for temperature detection in low-temperature, medium-temperature and high-temperature states, and the precision resistors with different resistance values are controlled to be connected in series, so that the final output resistance value is regulated and controlled precisely, meanwhile, the coverage range of the output resistance value can be effectively increased, further, the temperature detection in a larger range can be realized, discontinuous step jump of the resistance values in the traditional resistance type temperature sensor is avoided, and further, the accuracy of the temperature detection is improved.
To better implement the utility model, further, n precision resistors are connected in series in sequence, wherein
Wherein n is the number of precision resistors, R 1 Is the resistance value of the first precision resistor, R max The maximum resistance value which can be output after the n precise resistors are connected in series is set.
In order to better realize the utility model, further, the resistance value R of the nth precision resistor n Resistance R of the first precision resistor 1 The relation between the two is: r is R n ＝2 n-1 R 1 。
In order to better realize the utility model, the transistor array further comprises a first Darlington transistor array and a second Darlington transistor array, wherein the input end of the first Darlington transistor array is connected with a first output pin group of the control module, and the output end of the first Darlington transistor array is connected with a relay from a first precision resistor to one side of an n-2 precision resistor; the input end of the second Darlington transistor array is connected with a second output pin group of the control module, and the output end of the second Darlington transistor array is connected with the n-1 precise resistor and the relay on one side of the n precise resistor.
In order to better realize the utility model, the control module further comprises a communication chip and a control singlechip, wherein the output end of the communication chip is connected with a signal receiving pin of the control singlechip, and a first output pin group on the control singlechip is connected with the input end of the first Darlington transistor array; and a second output pin group on the control singlechip is connected with the input end of the second Darlington transistor array.
In order to better realize the utility model, the touch screen is further provided with a touch screen, and the signal output end of the touch screen is connected with the input end of the communication chip.
In order to better realize the utility model, the relay further comprises a relay coil and a relay switch, wherein the relay switch is arranged at two ends of the precision resistor in parallel, the relay coil is arranged at one side of the relay switch, and the input end of the relay coil is connected with the output end of the first Darlington transistor array or the output end of the second Darlington transistor array.
Compared with the prior art, the utility model has the following advantages:
according to the utility model, a plurality of precision resistors with different resistance values are connected in series to form the resistor detection circuit, one side of each precision resistor is connected in parallel with the relay, meanwhile, a control signal is sent to the transistor array through the control module, the switching of the relays connected in parallel with one side of the different precision resistors is respectively controlled through the transistor array, then the precision resistors are controlled to be short-circuited or connected into the resistor detection circuit through the relay, the number and the resistance value of the precision resistors finally connected into the resistor detection circuit are regulated and controlled, further different output resistors are flexibly combined, the range of the output resistor is effectively increased, further, the temperature in a larger range can be detected, meanwhile, the stepped fault jump of the resistor is avoided, and the accuracy of temperature detection is further improved.
Drawings
FIG. 1 is an overall architecture diagram of a temperature sensor simulator;
FIG. 2 is a circuit diagram of a control module;
FIG. 3 is a series circuit diagram of a precision resistor;
FIG. 4 is a circuit diagram of a connection between a touch screen and a communication chip;
fig. 5 is a circuit diagram of a first darlington transistor array;
fig. 6 is a circuit diagram of a second darlington transistor array;
fig. 7 is a circuit diagram showing the connection between the relay and the precision resistor.
Wherein: 1-a control module; 2-controlling the driving unit; 3-precision resistor; 11-a communication chip; 12-controlling a singlechip; 13-a touch screen; a 21-transistor array; 22-relay.
Detailed Description
Example 1:
the large-range temperature sensor simulator of the embodiment, as shown in fig. 1, comprises a control module 1, a control driving unit 2 connected with the control module 1, and a plurality of precision resistors 3 with different resistance values which are sequentially connected in series, wherein the control driving unit 2 comprises a transistor array 21 and a relay 22, the input end of the transistor array 21 is connected with the control module 1 and is used for receiving a level signal of the control module 1, the output end of the transistor array 21 is connected with the relay 22 and is used for controlling the opening or closing of the relay 22, and the relay 22 is arranged on one side of each precision resistor 3 and is used for closing the short-circuit precision resistor 3.
The precise resistors 3 with different resistance values are sequentially connected in series to form a resistor detection circuit, and the resistor detection circuit is used for outputting the resistance values of the precise resistors 3 after being connected in series. The current temperature can be calculated by outputting the relation between the resistance and the temperature.
When the control module 1 outputs high level to the relays 22 on the sides of the different precision resistors 3 through the transistor array 21, the relays 22 are conducted and closed, and then the precision resistor 3 connected in parallel with the conducted relays 22 is short-circuited. The short-circuited precision resistor 3 is no longer connected in series with the remaining non-short-circuited precision resistors 3; when the control module 1 outputs a low level to the relay 22 on the side of the different precision resistor 3 through the transistor array 21, the relay 22 is turned off, and the precision resistor 3 connected in parallel with the turned-off relay 22 is connected to the resistor detection circuit. The relay 22 on one side of the different precision resistors 3 is controlled to be on/off through the control module 1, the number of the precision resistors 3 connected into the resistor detection circuit is controlled in real time, different resistance values are output in a combined mode, the range of output resistance values is further increased, the range of temperature detection is further expanded, meanwhile, the precision resistors with different resistance values are connected in series in a matched mode, the continuity of the finally output resistance values is improved, step jump can not occur, and the accuracy of temperature detection is further improved.
Example 2:
this embodiment is further optimized based on embodiment 1, in which n precision resistors 3 are serially connected in sequence, wherein
Wherein n is the number of precision resistors 3, R 1 R is the resistance of the first precision resistor 3 max The maximum resistance value which can be output after the n precision resistors 3 are connected in series.
For example, the resistance R of the first precision resistor 3 1 =0.2Ω, the required maximum resistance value R that can be output max =150Ω, according to
Calculated n is more than or equal to 9.55, and n=10 after rounding.
Further, the resistance R of the nth precision resistor 3 n Resistance R with the first precision resistor 3 1 The relation between the two is: r is R n ＝2 n-1 R 1 。
For example, the resistance R of the first precision resistor 3 1 The resistance value R of the second precision resistor 3 is =0.2Ω 2 The resistance R of the third precision resistor 3 is =2×0.2=0.4Ω 3 ＝2 (3-1) ×0.2By analogy, the resistance R of the nth precision resistor 3 is obtained n 。
As shown in FIG. 3, a total of 10 precise resistors R are arranged in series 1 -R 10 Wherein R is 1 ＝0.2Ω，R 2 ＝0.4Ω，R 3 ＝0.8Ω，R 4 ＝1.6Ω，R 5 ＝3.2Ω，R 6 ＝6.4Ω，R 7 ＝12.8Ω，R 8 ＝25.6Ω，R 9 ＝51.2Ω，R 10 ＝102.4Ω。
If the resistance value required to be finally output is 84 omega, a control signal is sent to the transistor array 21 through the control module 1 so that the transistor array 21 is led to R 3 、R 6 、R 8 、R 9 The relay 22 on one side outputs a low level to R 1 、R 2 、R 4 、R 5 、R 7 、R 10 The relay on one side outputs a high level, R 1 、R 2 、R 4 、R 5 、R 7 、R 10 Is short-circuited, practically only R 3 、R 6 、R 8 、R 9 The outputs are serially connected such that the resistance of the final output is 84Ω.
If the final output resistance value is required to be 107.9Ω, a control signal is sent to the transistor array 21 by the control module 1, so that the transistor array 21 is directed to R 1 、R 2 、R 4 、R 5 、R 10 The relay 22 on one side outputs a low level to R 3 、R 6 、R 7 、R 8 、R 9 The relay on one side outputs a high level, R 3 、R 6 、R 7 、R 8 、R 9 Is short-circuited, practically only R 1 、R 2 、R 4 、R 5 、R 10 The series outputs are such that the resistance of the final output is 107.8Ω and the theoretical error is only 0.1Ω.
Other portions of this embodiment are the same as those of embodiment 1 described above, and thus will not be described again.
Example 3:
further optimizing the present embodiment based on the above embodiment 1 or 2, as shown in fig. 5 and 6, the transistor array 21 includes a first darlington transistor array and a second darlington transistor array, where an input end of the first darlington transistor array is connected to a first output pin group of the control module 1, and an output end of the first darlington transistor array is connected to the relay 22 on one side of the first precision resistor 3 to the n-2 th precision resistor 3; the input end of the second darlington transistor array is connected with the second output pin group of the control module 1, and the output end of the second darlington transistor array is connected with the n-1 precise resistor 3 and the relay 22 on one side of the n-th precise resistor 3.
The output terminal of the first darlington transistor array is used for outputting a level signal to the relay 22 corresponding to one side of the first precision resistor 3 to the n-2 th precision resistor 3, and controlling whether the first precision resistor 3 to the n-2 th precision resistor 3 are short-circuited.
The output end of the second darlington transistor array is used for outputting a level signal to the relay 22 corresponding to the n-1 th precision resistor 3 and one side of the n-th precision resistor 3, and the resistance values of the n-1 th precision resistor 3 and the n-th precision resistor 3 are usually larger, so that the final output resistance value can be quickly adjusted in a large range by controlling whether the resistance values of the n-1 th precision resistor 3 and the n-th precision resistor 3 are short-circuited.
According to the actual use requirement, the output end of the second darlington transistor array can be connected with the relay 22 on one side of the compact resistor 3 with different serial numbers and different resistance values, so that the output resistance value in a specific range can be regulated and controlled rapidly.
Other portions of this embodiment are the same as those of embodiment 1 or 2 described above, and thus will not be described again.
Example 4:
the present embodiment is further optimized based on any one of the foregoing embodiments 1 to 3, as shown in fig. 2, the control module 1 includes a communication chip 11 and a control singlechip 12, an output end of the communication chip 11 is connected to a signal receiving pin of the control singlechip 12, and a first output pin group on the control singlechip 12 is connected to an input end of the first darlington transistor array; a second output pin set on the control singlechip 12 is connected with the input end of the second darlington transistor array. The communication chip 11 adopts an RS422 communication chip, and the control singlechip 12 adopts an AT90CAN128 singlechip. The communication chip 11 is used for inputting external instructions and transmitting the instructions to the control singlechip 12, and the output end of the communication chip 11 is connected with RXD0/PE0 and TXD0/PE1 ports on the control singlechip 12. The first output pin group on the control singlechip 12 comprises eight PB0-PB7 pins, which are used for being connected with eight I1-I8 input ports on the first Darlington transistor array, and eight O1-O8 ports on the first Darlington transistor array are correspondingly connected with the relays 22 on one sides of the first to eighth precision resistors 3 respectively.
The second output pin set on the control singlechip 12 comprises two pins PC0 and PC1, which are used for connecting with two input ports I1 and I2 on the second darlington transistor array, and two ports O1 and O2 on the second darlington transistor array are respectively and correspondingly connected with a relay 22 on one side of the ninth precision resistor 3 and the tenth precision resistor 3.
Further, as shown in fig. 4, the electronic device further includes a touch screen 13, where a signal output end of the touch screen 13 is connected with an input end of the communication chip 11, and a control instruction can be quickly input through the touch screen 13 and sent to the control singlechip 12 through the communication chip 11, so that a control flow is visual and intuitive.
Other portions of this embodiment are the same as any of embodiments 1 to 3 described above, and thus will not be described again.
Example 5:
this embodiment is further optimized based on any one of the foregoing embodiments 1 to 4, as shown in fig. 7, the relay 22 includes a relay coil and a relay switch, where the relay switch is disposed in parallel at two ends of the precision resistor 3, the relay coil is disposed at one side of the relay switch, and an input end of the relay coil is connected to an output end of the first darlington transistor array or an output end of the second darlington transistor array.
When the relay coil inputs high level, the relay coil attracts the relay switch to be disconnected, so that the corresponding precise resistor 3 is connected to the resistor measuring circuit. When the relay coil inputs a low level, the relay switch is closed, so that the corresponding precision resistor 3 is short-circuited and is not connected into the resistor measuring circuit.
Other portions of this embodiment are the same as any of embodiments 1 to 4 described above, and thus will not be described again.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present utility model fall within the scope of the present utility model.
Claims (7)
1. The utility model provides a large scale temperature sensor simulator, includes control module (1) and control drive unit (2) be connected with control module (1), its characterized in that still includes a plurality of accurate resistance (3) that establish ties in proper order the resistance is different, control drive unit (2) include transistor array (21) and relay (22), the input of transistor array (21) is connected with control module (1) and is used for receiving the level signal of control module (1), the output of transistor array (21) is connected with relay (22) and is used for the disconnection or the closure of control relay (22), relay (22) set up in each accurate resistance (3) one side and are used for the closed short circuit accurate resistance (3).
2. A wide range temperature sensor simulator according to claim 1, characterized in that n precision resistors (3) are connected in series in sequence, wherein
N is N, wherein N is the number of precision resistors (3), R 1 Is the resistance value of the first precision resistor (3), R max The maximum resistance value which can be output after the n precision resistors (3) are connected in series.
3. A wide range temperature sensor simulator according to claim 2, characterized in that the resistance R of the nth precision resistor (3) n Resistance R with the first precision resistor (3) 1 The relation between the two is: r is R n ＝2 n-1 R 1 。
4. A wide range temperature sensor simulator according to any of claims 1-3, characterized in that the transistor array (21) comprises a first darlington transistor array and a second darlington transistor array, the input of the first darlington transistor array being connected to a first output pin group of the control module (1), the output of the first darlington transistor array being connected to a relay (22) on the side of the first precision resistor (3) to the n-2 precision resistor (3); the input end of the second Darlington transistor array is connected with a second output pin group of the control module (1), and the output end of the second Darlington transistor array is connected with the n-1 precise resistor (3) and a relay (22) on one side of the n precise resistor (3).
5. The wide-range temperature sensor simulator according to claim 4, wherein the control module (1) comprises a communication chip (11) and a control singlechip (12), an output end of the communication chip (11) is connected with a signal receiving pin of the control singlechip (12), and a first output pin group on the control singlechip (12) is connected with an input end of a first darlington transistor array; and a second output pin group on the control singlechip (12) is connected with the input end of the second Darlington transistor array.
6. The wide range temperature sensor simulator of claim 5, further comprising a touch screen (13), wherein a signal output of the touch screen (13) is connected to an input of the communication chip (11).
7. The wide range temperature sensor simulator of claim 6, wherein the relay (22) comprises a relay coil and a relay switch, the relay switch is arranged at two ends of the precision resistor (3) in parallel, the relay coil is arranged at one side of the relay switch, and an input end of the relay coil is connected with an output end of the first darlington transistor array or an output end of the second darlington transistor array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222155609.9U CN218973682U (en) | 2022-08-16 | 2022-08-16 | Large-range temperature sensor simulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222155609.9U CN218973682U (en) | 2022-08-16 | 2022-08-16 | Large-range temperature sensor simulator |
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| Publication Number | Publication Date |
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| CN218973682U true CN218973682U (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222155609.9U Active CN218973682U (en) | 2022-08-16 | 2022-08-16 | Large-range temperature sensor simulator |
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| CN (1) | CN218973682U (en) |
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