CN216246887U - NTC-based high-precision temperature measuring circuit - Google Patents
NTC-based high-precision temperature measuring circuit Download PDFInfo
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- CN216246887U CN216246887U CN202122643332.XU CN202122643332U CN216246887U CN 216246887 U CN216246887 U CN 216246887U CN 202122643332 U CN202122643332 U CN 202122643332U CN 216246887 U CN216246887 U CN 216246887U
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- 238000009529 body temperature measurement Methods 0.000 claims abstract description 9
- 230000001276 controlling effect Effects 0.000 claims abstract description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 4
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 239000004065 semiconductor Substances 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 22
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 3
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Abstract
A high-precision temperature measuring circuit based on an NTC comprises an NTC temperature sensor, a divider resistor, an MOS (metal oxide semiconductor) switch module, a filter, an AD (analog-to-digital) converter and an MCU (micro controller unit) controller; the NTC temperature sensor is respectively connected with a divider resistor, an MOS switch module, a reference ground and a filter, and the other end of the divider resistor is connected with the AD converter; the input end of the filter is connected with the NTC temperature sensor and the reference ground, the output end of the filter is connected with the AD converter, and the AD converter is connected with the MCU controller; and the MOS change-over switch module is used for regulating and controlling whether the NTC temperature sensor is connected with the resistor in parallel so as to switch different temperature measuring ranges. The utility model has low cost, wider temperature measuring range and higher precision, and can meet the requirement of high-precision temperature measurement in the full temperature range.
Description
Technical Field
The utility model relates to a temperature measuring circuit, in particular to a high-precision temperature measuring circuit based on an NTC.
Background
As is known, the NTC temperature sensor can be equivalent to a variable resistor inside, and the principle is that the resistance value decreases with the temperature. Since temperature measurement plays an extremely important role in cold chain transportation and life production, NTC temperature sensors are widely applied to the relevant field of temperature measurement, and the accuracy of temperature measurement determines the accuracy of intelligent control and judgment.
As shown in fig. 1, a known high-precision temperature acquisition circuit based on an NTC temperature sensor includes an NTC temperature sensor array, a voltage regulator, an AD converter, a controller, an external interface, a standard resistor array, a first switch array and a second switch array, where the first switch array and the second switch array are respectively connected to one of the standard resistor array and one of the NTC temperature sensor array; the AD converter is used for collecting a partial pressure signal between the communicated standard resistor and the communicated NTC temperature sensor and performing analog-to-digital conversion; the controller is used for providing a switch selection signal and calculating a temperature value of the NTC temperature sensor; the external interface is used for providing the acquired data to an external device. The circuit can obtain better precision within a wide acquisition temperature range, and is low in development cost and easy to realize.
The circuit uses different combinations of a plurality of standard resistors and a plurality of sensors to realize full-range temperature measurement, but the standard resistors have the defects of high cost, difficulty in batch purchase, production and the like.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model provides the NTC-based high-precision temperature measuring circuit which is low in cost, wider in temperature measuring range and higher in precision and can meet the requirement of high-precision temperature measurement in the full temperature range.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
a high-precision temperature measuring circuit based on an NTC comprises an NTC temperature sensor, a divider resistor, an MOS (metal oxide semiconductor) switch module, a filter, an AD (analog-to-digital) converter and an MCU (micro controller unit) controller; the NTC temperature sensor is respectively connected with a divider resistor, an MOS switch module, a reference ground and a filter, and the other end of the divider resistor is connected with the AD converter; the input end of the filter is connected with the NTC temperature sensor and the reference ground, the output end of the filter is connected with the AD converter, and the AD converter is connected with the MCU controller; and the MOS change-over switch module is used for regulating and controlling whether the NTC temperature sensor is connected with the resistor in parallel so as to switch different temperature measuring ranges.
Compared with the prior art, the NTC-based high-precision temperature measuring circuit has the following remarkable advantages:
1. in the circuit design, a common resistor and a high-precision NTC temperature sensor are adopted, so that the overall cost is relatively low, and the circuit complexity is low;
2. by switching the measuring range, segmented measurement is introduced, the measured temperature range is extremely wide, and the measurement error is corrected by calibration, so that high-precision measurement is realized in the full temperature range.
Drawings
The utility model is further illustrated with reference to the following figures and examples.
Fig. 1 is a circuit diagram of the prior art.
Fig. 2 is a circuit diagram of one embodiment of the utility model.
Figure 3 is a circuit diagram of one embodiment of the present invention in one span state.
Figure 4 is a circuit diagram of one embodiment of the present invention in another span state.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
Fig. 2 to 4 are schematic structural diagrams illustrating a preferred embodiment of the present invention, and fig. 1 is a schematic structural diagram illustrating an NTC-based high-precision temperature measuring circuit including an NTC temperature sensor, a voltage dividing resistor, a MOS switch module, a filter, an AD converter, and an MCU controller; the NTC temperature sensor is respectively connected with a divider resistor, an MOS switch module, a reference ground and a filter, and the other end of the divider resistor is connected with the AD converter; the filter is a four-port circuit, the input end of the filter is connected with the NTC temperature sensor and the reference ground, the output end of the filter is connected with the AD converter, and the AD converter is connected with the MCU controller; and the MOS change-over switch module is used for regulating and controlling whether the NTC temperature sensor is connected with the resistor in parallel so as to switch different temperature measuring ranges.
In this embodiment, the MOS switch module is composed of a resistor R3, a MOS transistor and a resistor R6, an S source terminal of the MOS transistor is connected to the NTC temperature sensor, a D drain terminal of the MOS transistor is connected to the resistor R3, a G gate terminal of the MOS transistor is respectively connected to one end of the resistor R6 and the MCU controller, and the other end of the resistor R6 is connected to the ground reference.
In this embodiment, the filter includes a common mode inductor L1, a capacitor C6, a capacitor C7, and a capacitor C10, where the common mode inductor L1 has 4 pins, a first pin of the common mode inductor L1 is connected to the MOS switch module, a second pin of the common mode inductor L1 is connected to one end of the capacitor C6, a third pin of the common mode inductor L1 is connected to the NTC temperature sensor, a fourth pin of the common mode inductor L1 is connected to one end of the capacitor C10, the other end of the capacitor C6 is connected to a reference ground, the other end of the capacitor C10 is connected to the reference ground, one end of the capacitor C7 is connected to the capacitor C6, and the other end of the capacitor C7 is connected to the capacitor C10.
The temperature measuring circuit can realize the temperature measuring range of-50 to 150 ℃, and the temperature measuring circuit is divided into two measuring ranges by the MOS change-over switch module to measure. Referring to fig. 3, in this embodiment, the temperature measuring circuit has a range of-50 to 30 degrees, where the MOS transistor is turned on and the resistor R3 is in parallel relationship with the NTC temperature sensor. Referring to fig. 4, in this embodiment, the temperature measuring circuit has a range of 25 to 150 degrees, and the MOS transistor is not turned on.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the technical spirit of the present invention are included in the protection scope of the present invention.
Claims (3)
1. A high accuracy temperature measurement circuit based on NTC which characterized in that: the device comprises an NTC temperature sensor, a divider resistor, an MOS (metal oxide semiconductor) change-over switch module, a filter, an AD (analog-to-digital) converter and an MCU (microprogrammed control unit) controller; the NTC temperature sensor is respectively connected with a divider resistor, an MOS switch module, a reference ground and a filter, and the other end of the divider resistor is connected with the AD converter; the input end of the filter is connected with the NTC temperature sensor and the reference ground, the output end of the filter is connected with the AD converter, and the AD converter is connected with the MCU controller; and the MOS change-over switch module is used for regulating and controlling whether the NTC temperature sensor is connected with the resistor in parallel so as to switch different temperature measuring ranges.
2. The NTC-based high precision temperature measurement circuit of claim 1, wherein: the MOS switch module consists of a resistor R3, an MOS tube and a resistor R6, wherein an S source end of the MOS tube is connected with the NTC temperature sensor, a D drain end of the MOS tube is connected with the resistor R3, a G gate end of the MOS tube is respectively connected with one end of the resistor R6 and the MCU controller, and the other end of the resistor R6 is connected with a reference ground.
3. An NTC-based high precision temperature measurement circuit according to claim 1 or 2, wherein: the filter consists of a common-mode inductor L1, a capacitor C6, a capacitor C7 and a capacitor C10, wherein a pin of the common-mode inductor L1 is respectively connected with one end of a MOS (metal oxide semiconductor) switch module, one end of a capacitor C6, one end of an NTC (negative temperature coefficient) temperature sensor and one end of a capacitor C10, the other end of the capacitor C6 is connected with the reference ground, the other end of the capacitor C10 is connected with the reference ground, one end of a capacitor C7 is connected with the capacitor C6, and the other end of the capacitor C7 is connected with the capacitor C10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122643332.XU CN216246887U (en) | 2021-11-01 | 2021-11-01 | NTC-based high-precision temperature measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122643332.XU CN216246887U (en) | 2021-11-01 | 2021-11-01 | NTC-based high-precision temperature measuring circuit |
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| Publication Number | Publication Date |
|---|---|
| CN216246887U true CN216246887U (en) | 2022-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122643332.XU Active CN216246887U (en) | 2021-11-01 | 2021-11-01 | NTC-based high-precision temperature measuring circuit |
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| CN (1) | CN216246887U (en) |
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2021
- 2021-11-01 CN CN202122643332.XU patent/CN216246887U/en active Active
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Address after: 221116 No. 21, the Pearl River East Road, No. 3 Industrial Park, Xuzhou High tech Industrial Development Zone, Xuzhou, Jiangsu Province Patentee after: JIANGSU JINGCHUANG ELECTRONICS Co.,Ltd. Country or region after: China Address before: 221000 No.1 Huangshan Road, Tongshan District, Xuzhou City, Jiangsu Province Patentee before: JIANGSU JINGCHUANG ELECTRONICS Co.,Ltd. Country or region before: China |
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