CN112362193A - Open circuit detection method of NTC temperature sensor - Google Patents
Open circuit detection method of NTC temperature sensor Download PDFInfo
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- CN112362193A CN112362193A CN202011090289.2A CN202011090289A CN112362193A CN 112362193 A CN112362193 A CN 112362193A CN 202011090289 A CN202011090289 A CN 202011090289A CN 112362193 A CN112362193 A CN 112362193A
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- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 32
- 239000003990 capacitor Substances 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 14
- 230000001052 transient effect Effects 0.000 claims description 2
- 230000002238 attenuated effect Effects 0.000 abstract description 4
- 238000009529 body temperature measurement Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses an open circuit detection method of an NTC temperature sensor, which comprises the following steps: sampling the temperature value of an NTC temperature sensor at intervals of a first fixed time, and comparing the temperature value of the NTC temperature sensor with a preset temperature value; and sampling the capacitance voltage value of the temperature measuring circuit at a second fixed time interval and recording a data track, if the capacitance voltage value of the temperature measuring circuit gradually attenuates to a fixed positive voltage value and keeps stable, judging that the NTC temperature sensor is normal, otherwise, judging that the NTC temperature sensor is open-circuit, and giving an alarm. According to the open circuit detection method of the NTC temperature sensor, when the NTC temperature sensor is in a low-temperature environment, unit impulse signals are output to the temperature measuring circuit of the NTC temperature sensor, if the capacitance voltage value of the temperature measuring circuit is gradually attenuated to a fixed positive voltage value and is kept stable, the NTC temperature sensor is judged to be normal, otherwise, the NTC temperature sensor is judged to be in an open circuit state, and the open circuit detection method is simple, convenient and reliable and high in accuracy.
Description
Technical Field
The invention belongs to the technical field of temperature measurement control, and particularly relates to an open circuit detection method of an NTC temperature sensor.
Background
The NTC temperature sensor, namely the negative temperature coefficient thermistor, is manufactured by taking metal oxides of manganese, cobalt, nickel, copper and the like as main materials and adopting a ceramic process. These metal oxide materials all have semiconductor properties and therefore are completely similar in conduction to semiconductor materials such as germanium, silicon, and the like. At low temperatures, these oxide materials have a low number of carriers (electrons and holes) and therefore have a high resistance; as the temperature increases, the number of carriers increases, so the resistance value decreases.
In a conventional temperature measurement control system, the temperature characteristic of the NTC temperature sensor is that the lower the temperature is, the larger the resistance value is. However, in the temperature measurement process, due to the limited accuracy of chip sampling, the resistance value of the NTC temperature sensor is large when the temperature is low, and the converted AD value is difficult to distinguish whether the resistance value is caused by open circuit or low temperature.
Disclosure of Invention
In order to solve the above problems, the present invention provides an open circuit detection method for an NTC temperature sensor, which can determine whether the NTC temperature sensor is in an open circuit state, and is simple, reliable and high in accuracy.
The technical scheme adopted by the invention is as follows:
an open circuit detection method of an NTC temperature sensor is characterized by comprising the following steps:
s1, electrifying the initialization sampling value;
s2, sampling the temperature value of the NTC temperature sensor at intervals of a first fixed time, comparing the temperature value of the NTC temperature sensor with a preset temperature value, and if the temperature value of the NTC temperature sensor is not greater than the preset temperature value, outputting a unit impulse signal to a temperature measuring circuit of the NTC temperature sensor;
and S3, sampling the capacitance voltage value of the temperature measuring circuit at intervals of second fixed time and recording a data track, if the capacitance voltage value of the temperature measuring circuit gradually attenuates to a fixed positive voltage value and keeps stable, judging that the NTC temperature sensor is normal, otherwise, judging that the NTC temperature sensor is open-circuit, and giving an alarm.
Preferably, the temperature measuring circuit includes a first NTC temperature sensor Rf1, a first resistor R1, a second resistor R2, a first capacitor EC1 and a first power supply, the first power supply is connected in series with the first NTC temperature sensor Rf1 and then connected in parallel with one end of the first resistor R1 and one end of the second resistor R2, the other end of the second resistor R2 is connected in parallel with one end of the first capacitor EC1 and an AD/IO pin of the micro-control unit, and the other end of the first resistor R1 and the other end of the first capacitor EC1 are both grounded.
Preferably, in S3, after sampling the temperature value of the NTC temperature sensor at intervals of a second fixed time and recording the data track, if the capacitor voltage of the temperature measurement circuit gradually decays to a fixed positive voltage value and remains stable, it is determined that the NTC temperature sensor is normal;
if the capacitor voltage of the temperature measuring circuit gradually attenuates to zero, the NTC temperature sensor is judged to be an open circuit, and an alarm is given.
Preferably, the temperature measuring circuit includes a second NTC temperature sensor Rf2, a third resistor R3, a fourth resistor R4, a second capacitor EC2 and a second power supply, the second power supply is connected in series with the third resistor R3 and then connected in parallel with one end of the second NTC temperature sensor Rf2 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected in parallel with one end of the second capacitor EC2 and an AD/IO pin of the micro-control unit, and the other end of the second NTC temperature sensor Rf2 and the other end of the second capacitor EC2 are both grounded.
Preferably, in S3, after sampling the temperature value of the NTC temperature sensor at intervals of a second fixed time and recording the data track, if the capacitor voltage of the temperature measurement circuit gradually decays to a fixed positive voltage value and remains stable, it is determined that the NTC temperature sensor is normal;
if the capacitance voltage of the temperature measuring circuit has no attenuation sign, the NTC temperature sensor is judged to be open-circuit, and an alarm is given.
Preferably, in S2, the temperature value of the NTC temperature sensor is sampled at intervals of a first fixed time by the sampling function of the pin of the micro control unit.
Preferably, in S2, if the temperature value of the NTC temperature sensor is greater than a preset temperature value, the temperature value of the NTC temperature sensor is sampled at intervals of a first fixed time.
Preferably, in S2, a short-term high-level signal, that is, a unit impulse signal, is output to the temperature measuring circuit of the NTC temperature sensor through the input/output function of the pin of the micro control unit.
Preferably, in S3, the capacitor voltage value of the temperature measuring circuit is sampled at a second fixed time interval by the sampling function of the pin of the mcu.
Preferably, in S2, the temperature value of the NTC temperature sensor sampled at intervals of the first fixed time is specifically: firstly, sampling the resistance value of an NTC temperature sensor, and then inquiring and acquiring a corresponding temperature value according to the resistance-temperature corresponding table of the NTC temperature sensor.
Compared with the prior art, the open circuit detection method of the NTC temperature sensor, disclosed by the invention, has the advantages that when the NTC temperature sensor is in a low-temperature environment, unit impulse signals are output to the temperature measuring circuit of the NTC temperature sensor, if the capacitance voltage value of the temperature measuring circuit is gradually attenuated to a fixed positive voltage value and is kept stable, the NTC temperature sensor is judged to be normal, otherwise, the NTC temperature sensor is judged to be in an open circuit state, and the method is simple, convenient and reliable and has high accuracy.
Drawings
Fig. 1 is a flowchart of an open circuit detection method of an NTC temperature sensor according to an embodiment of the present invention;
fig. 2 is a detailed flowchart of an open circuit detection method of an NTC temperature sensor according to an embodiment of the present invention;
fig. 3 is a first temperature measuring circuit diagram of an open circuit detecting method of an NTC temperature sensor according to an embodiment of the present invention;
fig. 4 is a second temperature measuring circuit diagram of an open circuit detecting method of an NTC temperature sensor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An embodiment of the present invention provides an open circuit detection method for an NTC temperature sensor, as shown in fig. 1-2, including the following steps:
s1, electrifying the initialization sampling value;
specifically, the temperature value of the NTC temperature sensor and the capacitance voltage value of the temperature measuring circuit are electrified and initialized;
s2, sampling the temperature value of the NTC temperature sensor at intervals of a first fixed time, comparing the temperature value of the NTC temperature sensor with a preset temperature value, and if the temperature value of the NTC temperature sensor is not greater than the preset temperature value, outputting a unit impulse signal to a temperature measuring circuit of the NTC temperature sensor;
and S3, sampling the capacitance voltage value of the temperature measuring circuit at intervals of second fixed time and recording a data track, if the capacitance voltage value of the temperature measuring circuit gradually attenuates to a fixed positive voltage value and keeps stable, judging that the NTC temperature sensor is normal, otherwise, judging that the NTC temperature sensor is open-circuit, and giving an alarm. The first fixed time is greater than the second fixed time.
Therefore, when the NTC temperature sensor is in a low-temperature environment, unit impulse signals are output to a temperature measuring circuit of the NTC temperature sensor, if the capacitance voltage value of the temperature measuring circuit is gradually attenuated to a fixed positive voltage value and is kept stable, the NTC temperature sensor is judged to be normal, otherwise, the NTC temperature sensor is judged to be in an open circuit state, and the method is simple, convenient and reliable and has high accuracy.
The temperature measuring circuit comprises two types: a first temperature measuring circuit and a second temperature measuring circuit.
The first temperature measuring circuit, as shown in fig. 3, includes a first NTC temperature sensor Rf1, a first resistor R1, a second resistor R2, a first capacitor EC1, and a first power supply, where the first power supply is connected in series with the first NTC temperature sensor Rf1 and then connected in parallel with one end of the first resistor R1 and one end of the second resistor R2, the other end of the second resistor R2 is connected in parallel with one end of the first capacitor EC1 and an AD/IO pin of the micro control unit, and the other end of the first resistor R1 and the other end of the first capacitor EC1 are both grounded.
When the temperature measuring circuit samples the first temperature measuring circuit, in S3, after sampling the temperature value of the NTC temperature sensor at intervals of the second fixed time and recording the data track,
if the capacitor voltage of the temperature measuring circuit gradually decays to zero after a period of time t, the NTC temperature sensor is judged to be open-circuit, and an alarm is given.
If the capacitor voltage of the temperature measuring circuit gradually attenuates to a fixed positive voltage value and keeps stable, namely U1 is Vdd R1/(Rf1+ R1), judging that the NTC temperature sensor is normal; meanwhile, since Rf1 is the resistance value of the sensor, which changes with temperature, this U1 changes, but U1 is much larger than zero.
The second temperature measuring circuit, as shown in fig. 4, includes a second NTC temperature sensor Rf2, a third resistor R3, a fourth resistor R4, a second capacitor EC2 and a second power supply, the second power supply is connected in series with the third resistor R3 and then connected in parallel with one end of the second NTC temperature sensor Rf2 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected in parallel with one end of the second capacitor EC2 and an AD/IO pin of the micro-control unit, and the other end of the second NTC temperature sensor Rf2 and the other end of the second capacitor EC2 are both grounded.
When the temperature measuring circuit samples the second temperature measuring circuit, in S3, after sampling the temperature value of the NTC temperature sensor at intervals of the second fixed time and recording the data track,
if the capacitance voltage of the temperature measuring circuit has no attenuation sign, the NTC temperature sensor is judged to be open-circuit, and an alarm is given.
If the capacitor voltage of the temperature measuring circuit gradually attenuates to a fixed positive voltage value and keeps stable, namely U2 is Vdd Rf2/(Rf2+ R3), judging that the NTC temperature sensor is normal; meanwhile, since Rf2 is the resistance value of the sensor, which changes with temperature, this U2 changes, but U2 is much larger than zero.
The specific working process is as follows:
s1, performing power-on initialization, and configuring a pin of the MCU to have an AD function, namely MCU-AD;
s2, sampling the temperature value of the NTC temperature sensor at intervals of a first fixed time (e.g., at intervals of N milliseconds) by using a sampling function (i.e., an AD function) of a pin of the MCU, where the sampling at intervals of the first fixed time specifically includes: firstly, sampling the resistance value of an NTC temperature sensor, and then inquiring and acquiring a corresponding temperature value according to a resistance-temperature corresponding table of the NTC temperature sensor; comparing the temperature value of the NTC temperature sensor with a preset temperature value (for example, -40 ℃ because the chip works stably at-40-80 ℃);
if the temperature value of the NTC temperature sensor is not greater than the preset temperature value, outputting a transient high-level signal, namely a unit impulse signal, to a temperature measuring circuit of the NTC temperature sensor through an input/output function (namely an IO function) of a pin of a micro control unit, and charging a capacitor in the temperature measuring circuit; and if the temperature value of the NTC temperature sensor is greater than the preset temperature value, continuously sampling the temperature value of the NTC temperature sensor at intervals of first fixed time.
S3, sampling the capacitance voltage value of the temperature measuring circuit at a second fixed time interval (for example, once at an interval of 100 microseconds) through the sampling function (namely AD function) of the pin of the micro control unit, and recording a data track;
when the temperature measuring circuit samples the first temperature measuring circuit, if the capacitance voltage of the temperature measuring circuit gradually decays to zero after a period of time t, the NTC temperature sensor is judged to be open-circuit, and an alarm is given; if the capacitor voltage of the temperature measuring circuit gradually attenuates to a fixed positive voltage value and keeps stable, judging that the NTC temperature sensor is normal;
when the temperature measuring circuit samples a second temperature measuring circuit, if the capacitance voltage of the temperature measuring circuit has no attenuation sign, the NTC temperature sensor is judged to be an open circuit, and an alarm is given; and if the capacitor voltage of the temperature measuring circuit gradually attenuates to a fixed positive voltage value and keeps stable, judging that the NTC temperature sensor is normal.
According to the open circuit detection method of the NTC temperature sensor, when the NTC temperature sensor is in a low-temperature environment, unit impulse signals are output to the temperature measuring circuit of the NTC temperature sensor, if the capacitance voltage value of the temperature measuring circuit is gradually attenuated to a fixed positive voltage value and is kept stable, the NTC temperature sensor is judged to be normal, otherwise, the NTC temperature sensor is judged to be in an open circuit state, and the open circuit detection method is simple, convenient and reliable and high in accuracy.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An open circuit detection method of an NTC temperature sensor is characterized by comprising the following steps:
s1, electrifying the initialization sampling value;
s2, sampling the temperature value of the NTC temperature sensor at intervals of a first fixed time, comparing the temperature value of the NTC temperature sensor with a preset temperature value, and if the temperature value of the NTC temperature sensor is not greater than the preset temperature value, outputting a unit impulse signal to a temperature measuring circuit of the NTC temperature sensor;
and S3, sampling the capacitance voltage value of the temperature measuring circuit at intervals of second fixed time and recording a data track, if the capacitance voltage value of the temperature measuring circuit gradually attenuates to a fixed positive voltage value and keeps stable, judging that the NTC temperature sensor is normal, otherwise, judging that the NTC temperature sensor is open-circuit, and giving an alarm.
2. The open circuit detection method of an NTC temperature sensor of claim 1, wherein the temperature measuring circuit comprises a first NTC temperature sensor Rf1, a first resistor R1, a second resistor R2, a first capacitor EC1 and a first power supply, the first power supply is connected in series with the first NTC temperature sensor Rf1 and then connected in parallel with one end of a first resistor R1 and one end of a second resistor R2, the other end of the second resistor R2 is connected in parallel with one end of the first capacitor EC1 and an AD/IO pin of the micro control unit, and the other end of the first resistor R1 and the other end of the first capacitor EC1 are both grounded.
3. The method for detecting an open circuit of an NTC temperature sensor according to claim 2, wherein in S3, after sampling the temperature value of the NTC temperature sensor at intervals of a second fixed time and recording the data trace, if the capacitor voltage of the temperature measuring circuit gradually decays to a fixed positive voltage value and remains stable, the NTC temperature sensor is determined to be normal;
if the capacitor voltage of the temperature measuring circuit gradually attenuates to zero, the NTC temperature sensor is judged to be an open circuit, and an alarm is given.
4. The open circuit detection method of an NTC temperature sensor according to claim 1, wherein the temperature measuring circuit includes a second NTC temperature sensor Rf2, a third resistor R3, a fourth resistor R4, a second capacitor EC2, and a second power source, the second power source is connected in series with the third resistor R3 and then connected in parallel with one end of the second NTC temperature sensor Rf2 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected in parallel with one end of the second capacitor EC2 and an AD/IO pin of the micro control unit, and the other end of the second NTC temperature sensor Rf2 and the other end of the second capacitor EC2 are both grounded.
5. The method for detecting an open circuit of an NTC temperature sensor according to claim 4, wherein in S3, after sampling the temperature value of the NTC temperature sensor at intervals of a second fixed time and recording the data trace, if the capacitance voltage of the temperature measuring circuit gradually decays to a fixed positive voltage value and remains stable, the NTC temperature sensor is determined to be normal;
if the capacitance voltage of the temperature measuring circuit has no attenuation sign, the NTC temperature sensor is judged to be open-circuit, and an alarm is given.
6. The open circuit detecting method of an NTC temperature sensor according to any one of claims 1 to 5, wherein in the S2, the temperature value of the NTC temperature sensor is sampled by the sampling function of the micro control unit pin at a first fixed time interval.
7. The method for detecting an open circuit of an NTC temperature sensor according to any one of claims 1 to 5, wherein in the step S2, if the temperature value of the NTC temperature sensor is greater than a preset temperature value, the sampling of the temperature value of the NTC temperature sensor is continued at intervals of a first fixed time.
8. The method for detecting an open circuit of an NTC temperature sensor according to any of claims 1-5, wherein in S2, a transient high level signal, i.e. a unit impulse signal, is outputted to the temperature measuring circuit of the NTC temperature sensor through the input/output function of the pin of the micro control unit.
9. The open circuit detecting method of an NTC temperature sensor according to any of claims 1-5, wherein in the S3, the capacitance voltage value of the temperature measuring circuit is sampled by the sampling function of the micro control unit pin at a second fixed time interval.
10. The method for detecting an open circuit of an NTC temperature sensor according to any of claims 1-5, wherein in the step S2, the temperature values of the NTC temperature sensor sampled at intervals of the first fixed time are specifically: firstly, sampling the resistance value of an NTC temperature sensor, and then inquiring and acquiring a corresponding temperature value according to the resistance-temperature corresponding table of the NTC temperature sensor.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113865737A (en) * | 2021-09-23 | 2021-12-31 | 睿联汽车电子(芜湖)有限公司 | Detection circuit and method for isolating controller and fault diagnosis method |
| CN114166805A (en) * | 2021-11-03 | 2022-03-11 | 格力电器（合肥）有限公司 | NTC temperature sensor detection method and device, NTC temperature sensor and manufacturing method |
| CN115376232A (en) * | 2022-08-18 | 2022-11-22 | 宁波市盈芯微电子科技有限公司 | Access control system |
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Application publication date: 20210212 |