CN218066797U - ADC temperature detection circuit - Google Patents
ADC temperature detection circuit Download PDFInfo
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- CN218066797U CN218066797U CN202221231382.5U CN202221231382U CN218066797U CN 218066797 U CN218066797 U CN 218066797U CN 202221231382 U CN202221231382 U CN 202221231382U CN 218066797 U CN218066797 U CN 218066797U
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Abstract
The utility model provides an ADC temperature detection circuit, which consists of a reference resistor, a temperature sensor and an ADC processor; the temperature sensor is arranged at a temperature point to be measured, and one output end of the temperature sensor is electrically connected with one end of the reference resistor and the ADC processor; the ADC processor comprises a reference voltage output end which is electrically connected with the other end of the reference resistor; the ADC temperature detection circuit has the advantages that the requirement on a power supply is reduced while high-precision measurement is realized, only one precision resistor is adopted, the circuit structure occupies the area of a circuit board, and the production cost is reduced on the number of components and the circuit structure.
Description
Technical Field
The utility model relates to a temperature detection technical field, concretely relates to ADC temperature detection circuit.
Background
At present, a temperature detection circuit generally comprises a temperature detection device, an analog-to-digital converter, a processor and the like, and converts an acquired electrical signal into a digital signal through the temperature detection circuit, and then outputs a corresponding temperature value through the processor.
For the temperature detection device, a thermal resistor is generally used as a temperature detector, and temperature measurement is performed based on the characteristic that the resistance value of a metal conductor of the thermal resistor increases with the increase of temperature. The connection mode between the thermal resistor and other devices determines the stability of temperature measurement and the accuracy of the final temperature detection result.
For example, in a "three-wire platinum thermistor PT100 temperature detection system" disclosed in chinese patent CN106092362A, the system includes a signal conditioning circuit, a microprocessor, and a serial communication module, and in a circuit connection structure, a three-wire temperature measurement circuit is adopted to eliminate the influence of the wire resistance on the measurement result, thereby improving the measurement accuracy. However, the two low-temperature drift precision resistors R1 and R2 are adopted in the circuit structure, which improves the measurement precision, but increases the production cost of the detection circuit.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model discloses solve the technical problem that temperature detection circuit structure manufacturing cost is high among the prior art to a ADC temperature detection circuit is provided.
According to a first aspect, an embodiment of the present invention provides an ADC temperature detection circuit, which comprises a reference resistor, a temperature sensor, and an ADC processor;
the temperature sensor is arranged at a temperature point to be measured, and one output end of the temperature sensor is electrically connected with one end of the reference resistor and the ADC processor;
the ADC processor comprises a reference voltage output end which is electrically connected with the other end of the reference resistor.
Optionally, the temperature sensor comprises a thermal resistor.
Optionally, the ADC processor comprises:
the thermal resistor comprises a first ADC pin, a second ADC pin and a third ADC pin, wherein one end of the thermal resistor is connected with the first ADC pin through a first lead, and the other end of the thermal resistor is electrically connected with the second ADC pin through a second lead and is electrically connected with the third ADC pin through a third lead;
and the power supply pin is connected with the other end of the reference resistor and is connected with a power supply.
Optionally, the reference resistor is a precision resistor, and the precision resistor has a resistance of 2K ohms and a precision of ± 0.01%.
Optionally, the ADC processor comprises a 12-bit precision ADC processing module.
Optionally, the first wire, the second wire and the third wire all use wires with the same preset parameters, and the preset parameters include length, cross-sectional area, diameter, outer diameter and material.
Optionally, the thermal resistor is a PT1000 platinum thermal resistor.
Optionally, the third ADC pin terminal is grounded.
The utility model discloses technical scheme has following advantage:
the utility model provides a ADC temperature detection circuitry, this ADC temperature detection circuitry hot resistance's one end is connected through first wire and reference resistance's one end electricity, and is connected through first wire and first ADC pin electricity, and the other end of thermal resistance is connected with second ADC pin and third ADC pin electricity through second wire and third wire respectively, and the other end of reference resistance still is connected with power pin electricity. The embodiment of the utility model provides an in ADC temperature detect circuit when possessing the high accuracy measurement, not only reduced the requirement to power supply, and only adopted an accurate resistance, when having reduced circuit structure area of occupying circuit board, all reduced manufacturing cost on components and parts quantity, circuit structure face.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of a specific example of an ADC temperature detection circuit in embodiment 1 of the present invention.
Detailed Description
The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment provides an ADC temperature detection circuit, is applied to the occasion that needs carry out temperature detection, especially needs high accuracy temperature detection, for example, precision device production, food processing, scientific research experiment etc.. The ADC temperature detection circuit provided by the implementation can be used for detecting the temperature in places with strict requirements on the environmental temperature, and the ADC temperature detection circuit is high in temperature detection result precision, simple in structure and low in cost. As shown in fig. 1, the ADC temperature detection circuit is composed of a reference resistor R1, a temperature sensor 11, and an ADC processor 12.
The temperature sensor is arranged at a temperature point to be measured, and one output end of the temperature sensor is electrically connected with one end of the reference resistor and the ADC processor; the ADC processor comprises a reference voltage output end which is electrically connected with the other end of the reference resistor.
In the practical application process, the temperature sensor part can be close to the temperature point to be measured, and the ADC processor is used for collecting the temperature of the temperature point to be measured. The ADC processor comprises a first ADC pin, a second ADC pin and a third ADC pin, and is electrically connected with a thermal resistor included in the temperature sensor, wherein one end of the thermal resistor is also electrically connected with one end of the reference resistor, and is electrically connected with the first ADC pin.
In this embodiment, the ADC processor may adopt a Micro Control Unit MCU (Micro Control Unit), which includes a 12-bit precision ADC processing module. The 12-bit precision ADC processing module can calculate thermal resistance data acquired by the first ADC pin, the second ADC pin and the third ADC pin, and due to the fact that the first ADC pin is connected with the reference resistor, the data acquired by the first ADC pin, the data acquired by the second ADC pin and the data acquired by the third ADC pin are different, and an accurate thermal resistance value can be determined according to the difference.
Specifically, the ADC temperature detection circuit is powered on through a power supply pin, an ADC processor takes VCC as reference voltage, first sampling is carried out on a thermal resistor through a first ADC pin, and a sampling result is stored; then the ADC processor performs second sampling on the thermal resistor through a second ADC pin, and stores a result; setting the full scale value to S =2 according to the selected sampling precision of the ADC processor N Where S is a full scale parameter of an ADC processing module in the ADC processor, and N is a precision bit of the ADC processing module, for example: the ADC processing module has 12-bit precision, then S =2 12 =4096; read the firstA subsampled value A0 and a second subsampled value A1; calculating the PT1000 thermal resistance value X according to the following formula;
X＝2000*(A0-2*A1)/(S-A0)
and searching a PT1000 scale according to the calculated resistance value X to obtain the temperature of the point to be measured.
To above-mentioned process such as specific use, precision are calculated, resistance value calculation, table look-up, the skilled person in the art basis the utility model provides a circuit structure combines the knowledge that self possessed, can directly obtain corresponding conclusion. That is, the effect described in the present embodiment can be derived in part from the ADC temperature detection circuit provided in the present embodiment.
It should be noted that the embodiment of the present invention mainly introduces the hardware structure of the ADC temperature detection circuit, and the present invention also protects the structure of the ADC temperature detection circuit and the components contained therein, and as for the contents of the methods such as acquisition and calculation, the present logic can be completely adopted.
In this embodiment, only need a reference resistance among the ADC temperature detection circuit, compare with traditional detection circuitry, on the basis that all improves temperature measurement accuracy, the embodiment of the utility model provides an ADC temperature detection circuit simple structure, greatly reduced manufacturing cost.
As an alternative, in the embodiment of the present invention, the temperature sensor includes a thermal resistor R5.
The material used for the thermal resistor can adopt platinum, copper, nickel and the like, so that the ratio of the temperature of the thermal resistor in a common temperature range to the resistance value of the thermal resistor is in a linear relation. Because platinum is a noble metal material, the physical and chemical properties of platinum are more stable, especially the oxidation resistance is very strong, the platinum is easy to purify, and the platinum has good manufacturability and can be prepared into an extremely fine platinum wire; since platinum is a relatively ideal thermal resistance material because of its higher resistivity and higher reproducibility as compared with metals such as copper and nickel, platinum can be used as the thermal resistance material in this embodiment.
As an optional implementation manner, in the embodiment of the present invention, the ADC processor includes:
the thermal resistor is connected with the first ADC pin through a first lead L1, and the other end of the thermal resistor is electrically connected with the second ADC pin through a second lead L2 and is electrically connected with the third ADC pin through a third lead L3; and the power supply pin Vref is connected with the other end of the reference resistor and is connected with a power supply VCC.
In this embodiment, the temperature sensor is connected by a three-wire system, that is, one end of the thermal resistor is connected to a first wire, and the other end of the thermal resistor is connected to two wires, that is, the second wire and the third wire in this embodiment. In order to ensure the accuracy of data acquisition of the first ADC pin ADC1, the second ADC pin ADC2 and the third ADC pin ADC3, the first conducting wire, the second conducting wire and the third conducting wire are all conducting wires with the same length, cross-sectional area, diameter, outer diameter, material and the like. The three-wire system connection is matched with the bridge for use, and the influence of lead resistors R2, R3 and R4 can be eliminated well.
The three-wire system connection adopted in the implementation is higher than the two-wire system connection, namely, the two ends of the thermal resistor are respectively connected with a lead to lead out a resistance signal, and the measurement precision is higher. The size of the wire resistance in the two-wire system connection mode is related to the factors of the material and the length of the wire, so the two-wire system connection mode is only suitable for occasions with low measurement precision.
As an optional implementation manner, in the embodiment of the present invention, the reference resistor is a precision resistor, and the resistance value of the precision resistor is 2K ohms and the precision is ± 0.01%.
In this embodiment, one end of the reference resistor is electrically connected to the first wire, and the other end is connected to the power supply. The reference resistor is a +/-0.01% precision resistor, the precision resistor can be a 2K ohm resistor, the temperature drift coefficient is 25 ppm/DEG C, and the precision of temperature measurement is greatly improved on the basis of only adopting one precision resistor.
Secondly, in the conventional temperature detection circuit, in order to cooperate with the conventional temperature detection circuit, the power supply of the conventional temperature detection circuit usually adopts a high-precision constant-voltage source or a high-precision constant-current source to supply power to the circuit, and the stability of the power supply directly influences the accuracy of a temperature detection result. And the embodiment of the utility model provides an in, final temperature's definite only is relevant with the data that first ADC pin, second ADC pin and third ADC pin were gathered, need not to adopt high accuracy constant voltage source or high accuracy constant current source to supply power for the circuit, can obtain the temperature result of high accuracy.
Therefore, the embodiment of the utility model provides a ADC temperature detection circuit when possessing the high accuracy measurement, has not only reduced the requirement to power supply, and has only adopted an accurate resistance, when having reduced circuit structure area of occupying circuit board, all reduced manufacturing cost on components and parts quantity, circuit structure face.
As an optional implementation manner, in the embodiment of the present invention, the ADC processor includes a 12-bit precision ADC processing module.
As an optional implementation manner, in the embodiment of the present invention, the first conducting wire, the second conducting wire and the third conducting wire all use conducting wires with the same preset parameters, and the preset parameters include length, cross-sectional area, diameter, outer diameter and material.
As an optional implementation manner, in the embodiment of the present invention, the thermal resistor is PT1000 platinum thermal resistor.
In the embodiment, the thermal resistor can be a PT1000 platinum thermal resistor, which is represented by the PT1000 platinum thermal resistor, and the resistance value of the thermal resistor is 1000 ohms at 0 ℃; the resistance value of the PT1000 platinum thermal resistor changes along with the change of temperature, namely, the resistance value of the PT1000 platinum thermal resistor increases at a constant speed along with the rise of temperature, and when the temperature is 300 ℃, the resistance value of the PT1000 platinum thermal resistor is about 2120.515 ohms, so that the use requirement of most temperature environments can be met.
Secondly, in this embodiment, a mode of combining the precision resistor and the three-way ADC is adopted, the temperature measurement range can reach the upper limit value of the platinum thermal resistor, and the 2K precision resistor is adopted as the reference resistor, so that the measurement precision is high, and compared with the traditional mode of connecting the processor through the operational amplifier, the structure is simple and the cost is low.
As an optional implementation manner, in an embodiment of the present invention, the third ADC pin is grounded. In this embodiment, only the thermal resistance data collected by the first ADC pin and the second ADC pin may be obtained, so that the data processing amount of the ADC processor may be reduced, and the processing efficiency of the ADC processor may be improved.
In this embodiment, one end of the thermal resistor is electrically connected to one end of the reference resistor through the first wire and is electrically connected to the first ADC pin through the first wire, the other end of the thermal resistor is electrically connected to the second ADC pin and the third ADC pin through the second wire and the third wire, respectively, and the other end of the reference resistor is further electrically connected to the power supply pin. The ADC temperature detection circuit in the embodiment has the advantages that the requirement on a power supply is reduced while high-precision measurement is realized, only one precision resistor is adopted, the circuit structure occupied area is reduced, and meanwhile, the production cost is reduced on the number of components and the circuit structure surface.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (8)
1. An ADC temperature detection circuit is characterized by comprising a reference resistor, a temperature sensor and an ADC processor;
the temperature sensor is arranged at a temperature point to be measured, and one output end of the temperature sensor is electrically connected with one end of the reference resistor and the ADC processor;
the ADC processor comprises a reference voltage output end which is electrically connected with the other end of the reference resistor.
2. The ADC temperature detection circuit of claim 1, wherein said temperature sensor comprises a thermal resistor.
3. The ADC temperature detection circuit of claim 2, wherein the ADC processor comprises:
the thermal resistor comprises a first ADC pin, a second ADC pin and a third ADC pin, wherein one end of the thermal resistor is connected with the first ADC pin through a first lead, and the other end of the thermal resistor is electrically connected with the second ADC pin through a second lead and is electrically connected with the third ADC pin through a third lead;
and the power supply pin is connected with the other end of the reference resistor and is connected with a power supply.
4. The ADC temperature detection circuit of claim 1, wherein the reference resistor is a precision resistor, and the precision resistor has a resistance of 2K ohms with a precision of ± 0.01%.
5. The ADC temperature detection circuit of claim 3 wherein the ADC processor comprises a 12-bit precision ADC processing module.
6. The ADC temperature detection circuit of claim 3, wherein the first, second and third wires are wires having the same predetermined parameters, and the predetermined parameters comprise length, cross-sectional area, diameter, outer diameter and material.
7. The ADC temperature sensing circuit of claim 2 wherein said thermal resistor is a PT1000 platinum thermal resistor.
8. The ADC temperature sensing circuit of claim 3 further comprising said third ADC pin terminal connected to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221231382.5U CN218066797U (en) | 2022-05-18 | 2022-05-18 | ADC temperature detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221231382.5U CN218066797U (en) | 2022-05-18 | 2022-05-18 | ADC temperature detection circuit |
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| Publication Number | Publication Date |
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| CN218066797U true CN218066797U (en) | 2022-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221231382.5U Active CN218066797U (en) | 2022-05-18 | 2022-05-18 | ADC temperature detection circuit |
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| CN (1) | CN218066797U (en) |
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- 2022-05-18 CN CN202221231382.5U patent/CN218066797U/en active Active
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