CN219495504U - Temperature acquisition circuit and system thereof - Google Patents
Temperature acquisition circuit and system thereof Download PDFInfo
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- CN219495504U CN219495504U CN202320399929.0U CN202320399929U CN219495504U CN 219495504 U CN219495504 U CN 219495504U CN 202320399929 U CN202320399929 U CN 202320399929U CN 219495504 U CN219495504 U CN 219495504U
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Abstract
The embodiment of the utility model discloses a temperature acquisition circuit and a system. The temperature acquisition circuit comprises: the temperature sensor comprises a signal switching unit, a first signal acquisition unit, a second signal acquisition unit, a temperature sampling unit and a controller, wherein the control end of the signal switching unit is connected with the first end of the controller, the first output end of the signal switching unit is connected with the first end of the first signal acquisition unit, and the second output end of the signal switching unit is connected with the first end of the second signal acquisition unit; the second end of the first signal acquisition unit and the second end of the second signal acquisition unit are connected with the input end of the temperature sampling unit, and the output end of the temperature sampling unit is connected with the second end of the controller. The first signal acquisition unit and the second signal acquisition unit are controlled to acquire temperature data in a time-sharing mode through outputting control signals to the signal switching unit, and the temperature sampling unit is used for sending the temperature data to the controller, so that two paths of temperature data can be acquired simultaneously through one port, and port resources of the controller are saved.
Description
Technical Field
The embodiment of the utility model relates to the technical field of electronics, in particular to a temperature acquisition circuit and a system thereof.
Background
With the rapid development of industry, the scale of industry is also larger and larger, and electronic technology is also rapidly developed. In the field of electronics, temperature detection technology is one of the most common technologies, and is often required to be applied both in products and in production. The thermistor can be used as a temperature acquisition device due to the characteristic that the resistance value of the thermistor is controlled by temperature.
The common technical scheme is that temperature data sensed by a thermistor is acquired through an ADC analog port of an MCU, and in a normal case, one ADC analog port correspondingly acquires one path of temperature data, and if multiple paths of temperature data are required to be acquired, a plurality of ADC analog ports are required to be occupied at the same time, so that port resources of the MCU are greatly wasted.
Disclosure of Invention
In order to solve the technical problems, the utility model adopts a technical scheme that: there is provided a temperature acquisition circuit comprising: the temperature sensor comprises a signal switching unit, a first signal acquisition unit, a second signal acquisition unit, a temperature sampling unit and a controller, wherein the control end of the signal switching unit is connected with the first end of the controller, the first output end of the signal switching unit is connected with the first end of the first signal acquisition unit, and the second output end of the signal switching unit is connected with the first end of the second signal acquisition unit; the second end of the first signal acquisition unit and the second end of the second signal acquisition unit are both connected with the input end of the temperature sampling unit, and the output end of the temperature sampling unit is connected with the second end of the controller; the control end of the signal switching unit is used for introducing a control signal output by the controller, and when the control signal is at a high level, the signal switching unit outputs a first voltage to the first signal acquisition unit so as to enable the first signal acquisition unit to work electrically; when the control signal is at a low level, the signal switching unit outputs a first voltage to the second signal acquisition unit so that the second signal acquisition unit can work electrically.
In some embodiments, the signal switching unit includes a switch chip, the control terminal of the signal switching unit is a control terminal of the switch chip, the first output terminal of the signal switching unit is a first output terminal of the switch chip, and the second output terminal of the signal switching unit is a second output terminal of the switch chip.
In some embodiments, the signal switching unit further comprises: the communication terminal of the switch chip is grounded through the first resistor; the communication end of the switch chip is grounded through the first capacitor.
In some embodiments, the first signal acquisition unit comprises a first thermistor; the first end of the first thermistor is connected to the first output end of the signal switching unit, and the second end of the first thermistor is connected to the input end of the temperature sampling unit.
In some embodiments, the second signal acquisition unit comprises a second thermistor; the first end of the second thermistor is connected to the second output end of the signal switching unit, and the second end of the second thermistor is connected to the input end of the temperature sampling unit.
In some embodiments, the temperature sampling unit comprises a second resistor, a third resistor and a second capacitor, wherein a first end of the second resistor is connected with a first end of the third resistor to form a first connection point, and the first connection point is connected with a second end of the first signal acquisition unit and a second end of the second signal acquisition unit; the second end of the second resistor is connected with the first end of the second capacitor to form a second connection point, the second connection point is connected with the second end of the controller, and the second end of the controller is an analog-to-digital converter (ADC) analog end; the second end of the third resistor and the second end of the second capacitor are grounded.
In some embodiments, the switch chip is a single pole double throw switch chip.
In order to solve the technical problems, the utility model adopts another technical scheme that: there is provided a temperature acquisition system comprising: a temperature acquisition circuit as described above.
The embodiment of the utility model has the beneficial effects that: unlike the prior art, the embodiment of the utility model provides a temperature acquisition circuit, which comprises: the temperature sensor comprises a signal switching unit, a first signal acquisition unit, a second signal acquisition unit, a temperature sampling unit and a controller, wherein the control end of the signal switching unit is connected with the first end of the controller, the first output end of the signal switching unit is connected with the first end of the first signal acquisition unit, and the second output end of the signal switching unit is connected with the first end of the second signal acquisition unit; the second end of the first signal acquisition unit and the second end of the second signal acquisition unit are both connected with the input end of the temperature sampling unit, and the output end of the temperature sampling unit is connected with the second end of the controller; the control end of the signal switching unit is used for introducing a control signal output by the controller, and when the control signal is at a high level, the signal switching unit outputs a first voltage to the first signal acquisition unit so as to enable the first signal acquisition unit to work electrically; when the control signal is at a low level, the signal switching unit outputs a first voltage to the second signal acquisition unit so that the second signal acquisition unit can work electrically. The controller outputs control signals to enable the first signal acquisition unit and the second signal acquisition unit to operate in a time-sharing mode, temperature data are sampled by the temperature sampling unit and sent to the ADC analog port of the controller, and therefore two paths of temperature data can be acquired simultaneously through one ADC analog port, and ADC analog port resources are saved.
Drawings
Fig. 1 is a schematic structural diagram of a temperature acquisition circuit according to an embodiment of the present utility model;
fig. 2 is a circuit topology diagram of a signal switching unit provided by the present utility model;
fig. 3 is a circuit topology diagram of a first signal acquisition unit provided by the present utility model;
fig. 4 is a circuit topology diagram of a second signal acquisition unit provided by the present utility model;
FIG. 5 is a circuit topology of a temperature acquisition circuit provided by the present utility model;
fig. 6 is a circuit topology diagram of a temperature acquisition circuit according to an embodiment of the present utility model.
Detailed Description
In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In order to save the resources of the ADC analog port of the MCU and improve the utilization ratio of the ADC analog port, the present application provides a temperature acquisition circuit, the structural schematic diagram of which is shown in fig. 1, and the temperature acquisition circuit 10 includes a signal switching unit 100, a controller 200, a first signal acquisition unit 300, a second signal acquisition unit 400 and a temperature sampling unit 500, wherein,
the control end of the signal switching unit 100 is connected to the first end of the controller 200, the first output end of the signal switching unit 100 is connected to the first end of the first signal acquisition unit 300, and the second output end of the signal switching unit 100 is connected to the first end of the second signal acquisition unit 400.
The second end of the first signal acquisition unit 300 and the second end of the second signal acquisition unit 400 are both connected with the input end of the temperature sampling unit 500, and the output end of the temperature sampling unit 500 is connected with the second end of the controller 200;
the control end of the signal switching unit 100 is connected to the first end of the controller 200 to introduce a control signal output by the controller 200, and when the control signal is at a high level, the signal switching unit 100 outputs a first voltage to the first signal acquisition unit 300 to enable the first signal acquisition unit 300 to work electrically; when the control signal is at a low level, the signal switching unit 100 outputs a first voltage to the second signal acquisition unit 400, so that the second signal acquisition unit 400 is electrically operated.
In other embodiments, the signal switching unit 100 may be configured to output the first voltage to the second signal acquisition unit 400 when the control signal is at the high level, so that the second signal acquisition unit 400 is electrically operated; when the control signal is at a low level, the signal switching unit 100 outputs a first voltage to the first signal acquisition unit 300, so that the first signal acquisition unit 300 is electrically operated. The method is specifically set according to actual application scenes.
In still other embodiments, the control signal is a PWM pulse signal with a certain duty cycle, so as to control the first signal acquisition unit 300 and the second signal acquisition unit 400 to alternately power up. The duty ratio of the PWM pulse signal may be set according to the actual temperature data acquisition requirement.
In some embodiments, as shown in fig. 2, the circuit topology of the signal switching unit 100, the signal switching unit 100 specifically includes a switch chip IC1, a first resistor R1, and a first capacitor C1, wherein,
the control end of the signal switching unit 100 is a control end of the switch chip IC1, the first output end of the signal switching unit 100 is a first output end of the switch chip IC1, and the second output end of the signal switching unit 100 is a second output end of the switch chip IC 1.
The control terminal IN of the switching chip IC1 is connected to the first terminal of the controller 200 to introduce a control signal; the power input end V+ of the switch chip IC1 is used for introducing a first working voltage, and the first working voltage is used for supplying power to the switch chip IC 1; the communication terminal COM of the switch chip IC1 is connected to one end of the first resistor R1 and one end of the first capacitor C1, respectively.
The first output terminal of the switching chip IC1 is connected to the first terminal of the first signal acquisition unit 300, and the second output terminal of the switching chip IC1 is connected to the first terminal of the second signal acquisition unit 400. The communication end of the switch chip IC1 is grounded through a first resistor R1 and a first capacitor C1 respectively.
In this embodiment, the switch chip IC1 is a single pole double throw switch chip, and in other embodiments, other signals may be used to control the switch chip, and the specific model of the switch chip IC1 is not limited.
In some embodiments, the circuit topology of the first signal acquisition unit 300 is as shown in fig. 3, and the first signal acquisition unit 300 includes a first thermistor TR1.
Specifically, a first terminal of the first thermistor TR1 is connected to a first output terminal of the signal switching unit 100, and a second terminal of the first thermistor TR1 is connected to an input terminal of the temperature sampling unit 500.
In some embodiments, the circuit topology of the second signal acquisition unit 400 is as shown in fig. 4, and the second signal acquisition unit 400 includes a second thermistor TR2.
Specifically, a first terminal of the second thermistor TR2 is connected to the second output terminal of the signal switching unit 100, and a second terminal of the second thermistor TR2 is connected to the input terminal of the temperature sampling unit 500.
In some embodiments, the circuit topology of the temperature sampling unit 500 is shown in fig. 5, and the temperature sampling unit 500 specifically includes a second resistor R2, a third resistor R3, and a second capacitor C2, wherein,
the first end of the second resistor R2 and the first end of the third resistor R3 are connected to form a first connection point a, which is connected to the second end of the first signal acquisition unit 300 and the second end of the second signal acquisition unit 400.
The second end of the second resistor R2 is connected with the first end of the second capacitor C2 to form a second connection point B, the second connection point B is connected with the second end of the controller 200, the second end of the controller 200 is an ADC analog end, and the second end of the third resistor R3 and the second end of the second capacitor C2 are grounded.
Based on the signal switching unit 100, the first signal collecting unit 300, the second signal collecting unit 400, and the temperature sampling unit 500, a circuit topology diagram of a temperature collecting circuit provided in this embodiment of the present application is shown in fig. 6, where the temperature collecting circuit includes a switch chip IC1, a first resistor R1, a first capacitor C1, a first thermistor TR1, a second thermistor TR2, a second resistor R2, a third resistor R3, a second capacitor C2, and a controller 200,
the control terminal IN of the switching chip IC1 is connected to the first terminal of the controller 200 to introduce a control signal; the power input end V+ of the switch chip IC1 is used for introducing a first working voltage, and the first working voltage is used for supplying power to the switch chip IC 1; the communication terminal COM of the switch chip IC1 is connected to one end of the first resistor R1 and one end of the first capacitor C1, respectively. The communication end of the switch chip IC1 is grounded through a first resistor R1 and a first capacitor C1.
The first output terminal of the switching chip IC1 is connected to the first terminal of the first thermistor TR1, and the second output terminal of the switching chip IC1 is connected to the first terminal of the second thermistor TR2.
The first end of the second resistor R2 and the first end of the third resistor R3 are connected to form a first connection point a, and the second end of the first thermistor TR1 and the second end of the second thermistor TR2 are both connected to the first connection point a.
The second end of the second resistor R2 is connected with the first end of the second capacitor C2 to form a second connection point B, the second connection point B is connected with the second end of the controller 200, the second end of the controller 200 is an ADC analog end, and the second end of the third resistor R3 and the second end of the second capacitor C2 are grounded.
Specifically, when the control signal received by the control terminal IN of the switching chip IC1 is at a high level, the switching chip IC1 outputs a first voltage to the first thermistor TR1, so that the first thermistor TR1 and the third resistor R3 are connected IN series to form a path.
The output voltage of the first connection point A1 can be obtained by the following formula:
VA＝R3/(R3+RT1)*VCC，
wherein VA is the output voltage of the first connection point A1, R3 is the resistance of the third resistor, RT1 is the real-time resistance of the first thermistor, and VCC is the first voltage.
Then, the output voltage of the first connection point A1 is output to the second connection point B through the current limiting resistor (i.e., the second resistor R2), the voltage of the second connection point B is detected by the ADC analog end of the controller 200, and the real-time resistance value of the RT1 is obtained according to the voltage calculation of the second connection point B, so as to calculate the real-time temperature of the RT 1.
Similarly, when the control signal received by the control terminal IN of the switch chip IC1 is at a low level, the switch chip IC1 outputs the second voltage to the second thermistor TR2, so that the second thermistor TR2 and the third resistor R3 are connected IN series to form a path.
The output voltage of the first connection point A1 can be obtained by the following formula:
VA＝R3/(R3+RT2)*VCC，
wherein VA is the output voltage of the first connection point A1, R3 is the resistance of the third resistor, RT1 is the real-time resistance of the second resistor, and VCC is the first voltage.
Then, the output voltage of the first connection point A1 is output to the second connection point B through the current limiting resistor (i.e., the second resistor R2), the voltage of the second connection point B is detected by the ADC analog end of the controller 200, and the real-time resistance value of the second thermistor RT2 is obtained according to the voltage calculation of the second connection point B, so as to calculate the real-time temperature of the second thermistor RT 2.
Different from the situation in the prior art, the temperature acquisition circuit provided by the embodiment of the utility model comprises: the temperature sensor comprises a signal switching unit, a first signal acquisition unit, a second signal acquisition unit, a temperature sampling unit and a controller, wherein the control end of the signal switching unit is connected with the first end of the controller, the first output end of the signal switching unit is connected with the first end of the first signal acquisition unit, and the second output end of the signal switching unit is connected with the first end of the second signal acquisition unit; the second end of the first signal acquisition unit and the second end of the second signal acquisition unit are both connected with the input end of the temperature sampling unit, and the output end of the temperature sampling unit is connected with the second end of the controller; the control end of the signal switching unit is used for introducing a control signal output by the controller, and when the control signal is at a high level, the signal switching unit outputs a first voltage to the first signal acquisition unit so as to enable the first signal acquisition unit to work electrically; when the control signal is at a low level, the signal switching unit outputs a first voltage to the second signal acquisition unit so that the second signal acquisition unit can work electrically. The controller outputs control signals to enable the first signal acquisition unit and the second signal acquisition unit to operate in a time-sharing mode, temperature data are sampled by the temperature sampling unit and sent to the ADC analog port of the controller, and therefore two paths of temperature data can be acquired simultaneously through one ADC analog port, and ADC analog port resources are saved.
Based on the temperature acquisition circuit, the application also provides a temperature acquisition system, which comprises the temperature acquisition circuit in the embodiment. The temperature acquisition system can comprise a plurality of temperature acquisition circuits so as to expand more signal acquisition units to meet the actual application requirements.
It should be noted that the description of the present utility model and the accompanying drawings illustrate preferred embodiments of the present utility model, but the present utility model may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are not to be construed as additional limitations of the utility model, but are provided for a more thorough understanding of the present utility model. The above-described features are further combined with each other to form various embodiments not listed above, and are considered to be the scope of the present utility model described in the specification; further, modifications and variations of the present utility model may be apparent to those skilled in the art in light of the foregoing teachings, and all such modifications and variations are intended to be included within the scope of this utility model as defined in the appended claims.
Claims (8)
1. A temperature acquisition circuit, comprising: the system comprises a signal switching unit, a first signal acquisition unit, a second signal acquisition unit, a temperature sampling unit and a controller, wherein,
the control end of the signal switching unit is connected with the first end of the controller, the first output end of the signal switching unit is connected with the first end of the first signal acquisition unit, and the second output end of the signal switching unit is connected with the first end of the second signal acquisition unit;
the second end of the first signal acquisition unit and the second end of the second signal acquisition unit are both connected with the input end of the temperature sampling unit, and the output end of the temperature sampling unit is connected with the second end of the controller;
the control end of the signal switching unit is used for introducing a control signal output by the controller, and when the control signal is at a high level, the signal switching unit outputs a first voltage to the first signal acquisition unit so as to enable the first signal acquisition unit to work electrically; when the control signal is at a low level, the signal switching unit outputs a first voltage to the second signal acquisition unit so that the second signal acquisition unit can work electrically.
2. The circuit of claim 1, wherein the signal switching unit comprises a switch chip, the control terminal of the signal switching unit is the control terminal of the switch chip, the first output terminal of the signal switching unit is the first output terminal of the switch chip, and the second output terminal of the signal switching unit is the second output terminal of the switch chip.
3. The circuit of claim 2, wherein the signal switching unit further comprises: a first capacitor and a first resistor, wherein,
the communication end of the switch chip is grounded through the first resistor;
the communication end of the switch chip is grounded through the first capacitor.
4. The circuit of claim 1, wherein the first signal acquisition unit comprises a first thermistor;
the first end of the first thermistor is connected to the first output end of the signal switching unit, and the second end of the first thermistor is connected to the input end of the temperature sampling unit.
5. The circuit of claim 1, wherein the second signal acquisition unit comprises a second thermistor;
the first end of the second thermistor is connected to the second output end of the signal switching unit, and the second end of the second thermistor is connected to the input end of the temperature sampling unit.
6. The circuit of any of claims 1-5, wherein the temperature sampling unit comprises a second resistor, a third resistor, and a second capacitor, wherein,
the first end of the second resistor is connected with the first end of the third resistor to form a first connection point, and the first connection point is connected with the second end of the first signal acquisition unit and the second end of the second signal acquisition unit;
the second end of the second resistor is connected with the first end of the second capacitor to form a second connection point, the second connection point is connected with the second end of the controller, and the second end of the controller is an analog-to-digital converter (ADC) analog end;
the second end of the third resistor and the second end of the second capacitor are grounded.
7. The circuit of claim 2, wherein the switch chip is a single pole double throw switch chip.
8. A temperature acquisition system, comprising: a temperature acquisition circuit as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320399929.0U CN219495504U (en) | 2023-02-24 | 2023-02-24 | Temperature acquisition circuit and system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320399929.0U CN219495504U (en) | 2023-02-24 | 2023-02-24 | Temperature acquisition circuit and system thereof |
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| CN219495504U true CN219495504U (en) | 2023-08-08 |
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| CN202320399929.0U Active CN219495504U (en) | 2023-02-24 | 2023-02-24 | Temperature acquisition circuit and system thereof |
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