CN215931116U - Anti-interference temperature detection circuit and air conditioner - Google Patents
Anti-interference temperature detection circuit and air conditioner Download PDFInfo
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- CN215931116U CN215931116U CN202121910732.6U CN202121910732U CN215931116U CN 215931116 U CN215931116 U CN 215931116U CN 202121910732 U CN202121910732 U CN 202121910732U CN 215931116 U CN215931116 U CN 215931116U
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Abstract
The application provides an anti-interference temperature detection circuit and an air conditioner, wherein the anti-interference temperature detection circuit comprises a first terminal, a second terminal, a voltage division module, a clamping module and a power supply; the first terminal is used for being externally connected with the thermistor, and the second terminal is used for being connected with the chip; the power supply is sequentially connected with the voltage division module and the first terminal in series and is grounded; the second terminal is connected with the first terminal and the common end of the voltage division module; the clamping module is connected with the voltage dividing module in parallel and is grounded, and the clamping module is used for limiting the voltage signal received by the chip to be lower than the breakdown voltage of the voltage signal. The application provides an anti-interference temperature detection circuit can solve the problem that current temperature detection circuit causes the too high and puncture of chip mouth voltage because of the static that external factors produced.
Description
Technical Field
The application relates to the technical field of temperature detection, in particular to an anti-interference temperature detection circuit and an air conditioner.
Background
With the development of air conditioning technology, the existing household air conditioner basically has a temperature detection function, and most of the existing household air conditioners detect the temperature through a temperature detection circuit by means of the characteristic that a thermistor generates resistance value change along with the temperature change. However, during general production and assembly, the thermistor is inserted and mounted through the terminal, static electricity may be generated during mounting, or static electricity may be generated due to other factors, and the generated static electricity may damage the chip.
SUMMERY OF THE UTILITY MODEL
The application provides an anti-interference temperature detection circuit and air conditioner to solve the problem that the static that current temperature detection circuit produced because of external factors leads to the too high and puncture of chip mouth voltage.
In order to achieve the purpose, the anti-interference temperature detection circuit provided by the application comprises a first terminal, a second terminal, a voltage division module, a clamping module and a power supply; the first terminal is used for being externally connected with the thermistor, and the second terminal is used for being connected with the chip; the power supply is sequentially connected with the voltage division module and the first terminal in series and is grounded; the second terminal is connected with the first terminal and the common end of the voltage division module; the clamping module is connected with the voltage dividing module in parallel and is grounded, and the clamping module is used for limiting the voltage signal received by the chip to be lower than the breakdown voltage of the voltage signal.
Optionally, the clamping module comprises a first diode and a second diode, a cathode of the first diode is connected with the common end of the voltage division module and the power supply, and an anode of the first diode is connected with the first terminal and the common end of the voltage division module; and the cathode of the second diode is connected with the first terminal and the common end of the voltage division module, and the anode of the second diode is grounded.
Optionally, the voltage dividing module includes a first resistor.
Optionally, the first terminal includes a first pin and a second pin, the second pin is connected to the first resistor, the other end of the first resistor is connected to the power supply, and the first pin is grounded.
Optionally, the interference-free temperature detection circuit further includes a second resistor, and the second terminal is connected to the second pin and a common terminal of the first resistor through the second resistor.
Optionally, the anti-interference temperature detection circuit further includes an electrolytic capacitor, an anode of the electrolytic capacitor is connected to the second resistor and a common end of the second pin, and a cathode of the electrolytic capacitor is connected to the first pin.
Optionally, the tamper resistant temperature detection circuit further includes a first capacitor, and the common end of the second terminal and the second resistor is connected to the first pin through the first capacitor.
Optionally, the thermistor is an NTC thermistor or a PTC thermistor.
Optionally, the power supply is a + 5V dc power supply.
In order to achieve the above object, the present application further provides an air conditioner, which includes any of the above anti-interference temperature detection circuits.
In the technical scheme provided by the application, anti-interference temperature detection circuit includes first terminal, second terminal, partial pressure module, clamp module and power. The first terminal is used for being externally connected with the thermistor, and the second terminal is used for being connected with the chip; the power supply is sequentially connected with the voltage division module and the first terminal in series and grounded, and the second terminal is connected with the first terminal and the common end of the voltage division module; the voltage dividing module is connected with the thermistor in series for voltage division, the middle fracture of the chip is consistent with the voltage values at the two ends of the chip after voltage division of the thermistor, when the external temperature changes, the resistance value of the thermistor at the two ends of the first terminal changes, after voltage division of the chip by the voltage dividing module, the voltages at the two ends of the thermistor change accordingly, and AD sampling is carried out on the change of the voltage value at the interrupt port of the chip, so that the external temperature is obtained. The clamping module is connected with the voltage dividing module in parallel and is grounded, when the thermistor is installed through the first terminal in an inserted mode, static electricity is generated, and when the static electricity reaches the front end of the interrupt port of the chip, the clamping module can limit the voltage of the static electricity to a certain range so as to ensure that the chip cannot be broken down by the voltage.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a circuit diagram of a tamper resistant temperature sensing circuit of the present application.
The reference numbers illustrate:
the implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
The embodiments of the present application provide an anti-interference temperature detection circuit, which is described in detail below.
Referring to fig. 1, in the embodiment of the present application, the anti-jamming temperature detection circuit includes a first terminal CN1, a second terminal PA1, a voltage division module 30, a clamping module D, and a power supply 40; the first terminal CN1 is used for externally connecting a thermistor (not shown), and the second terminal PAI is used for connecting a chip (not shown); the power supply 40 is sequentially connected in series with the voltage division module 30 and the first terminal CN1 and is grounded; the second terminal PA1 is connected to the first terminal CN1 and the common terminal of the voltage dividing module 30; the clamping module D is connected in parallel with the voltage dividing module 30 and grounded, and is used for limiting the voltage signal received by the chip to be lower than the breakdown voltage thereof.
In the technical solution provided in the present application, the anti-interference temperature detection circuit includes a first terminal CN1, a second terminal PA1, a voltage division module 30, a clamping module D, and a power supply 40. The first terminal CN1 is used for externally connecting a thermistor, and the second terminal PA1 is used for connecting a chip; the power supply 40 is sequentially connected in series with the voltage dividing module 30 and the first terminal CN1 and is grounded, and the second terminal PA1 is connected with the common terminal of the first terminal CN1 and the voltage dividing module 30; the voltage dividing module 30 is connected with the thermistor in series for voltage division, the middle fracture of the chip is consistent with the voltage values at the two ends of the chip after voltage division of the thermistor, when the external temperature changes, the resistance value of the thermistor at the two ends of the first terminal CN1 changes, after voltage division of the voltage dividing module 30, the voltage at the two ends of the thermistor changes along with the resistance value, and the interruption port of the chip performs AD sampling through the change of the voltage value, so that the external temperature is obtained. The clamping module D is connected in parallel with the voltage dividing module 30 and grounded, when the thermistor is inserted and mounted through the first terminal CN1, static electricity is generated, and when the static electricity reaches the front end of the interrupt port of the chip, the clamping module D can limit the voltage of the static electricity to a certain range, so as to ensure that the voltage does not break down the chip.
Specifically, in the present embodiment, the clamping module D includes a first diode D1 and a second diode D2, a cathode of the first diode D1 is connected to the common terminal of the voltage dividing module 30 and the power source 40, and an anode of the first diode D1 is connected to the common terminal of the first terminal CN1 and the voltage dividing module 30; the cathode of the second diode D2 is connected to the common terminal of the first terminal CN1 and the voltage dividing module 30, and the anode of the second diode D2 is grounded. It is understood that the anode of the first diode D1 is connected to the cathode of the second diode D2, and the connection point is the PIN point of the clamping module D. The potential range of the PIN point can be limited between the power supply 40 voltage and the ground voltage by the first diode D1 and the second diode D2, and the power supply 40 voltage and the ground voltage do not exceed the breakdown voltage of the chip, so the clamping module D can well protect the chip from breakdown.
Specifically, in the present embodiment, the voltage dividing module 30 includes a first resistor R1. The first resistor R1 is connected in series with a thermistor externally connected with the first terminal CN1, the first resistor R1 is connected in series with the thermistor for voltage division, a middle fracture of the chip is consistent with voltage values of two ends of the thermistor after voltage division, when the external temperature changes, the resistance value of the thermistor at two ends of the first terminal CN1 changes, the voltage at two ends of the thermistor changes after voltage division with the first resistor R1, and the interrupt port of the chip performs AD sampling through the change of the voltage value, so that the external temperature is obtained.
Specifically, the first terminal CN1 includes a first pin 10 and a second pin 20, the second pin 20 of the first terminal CN1 is connected to the first resistor R1, the other end of the first resistor R1 is connected to the power source 40, and the first pin 10 of the first terminal CN1 is grounded.
Further, the tamper resistant temperature detection circuit further includes a second resistor R2, and the second terminal PA1 is connected to the common terminal of the second pin 20 and the first resistor R1 through the second resistor R2. The second resistor R2 is used as a current limiting resistor to prevent the chip from being burnt out due to overlarge current.
Furthermore, the anti-interference temperature detection circuit further comprises an electrolytic capacitor E1, the anode of the electrolytic capacitor E1 is connected with the second resistor R2 and the common end of the second pin 20, and the cathode of the electrolytic capacitor E1 is connected with the first pin 10. By utilizing the charge-discharge characteristics of the electrolytic capacitor E1, the rectified pulsating DC voltage can be changed into a relatively stable DC voltage, and the stability of the circuit is improved.
Furthermore, the tamper resistant temperature detection circuit further comprises a first capacitor C1, and the common terminal of the second terminal PA1 and the second resistor R2 is connected to the first pin 10 through the first capacitor C1. The first capacitor C1 is a filter capacitor, and can filter clutter interference in a circuit to ensure more accurate temperature detection.
Further, the thermistor is an NTC thermistor (negative temperature coefficient thermistor) or a PTC thermistor (positive temperature coefficient thermistor). The NTC thermistor has a lower resistance value at higher temperatures, and the PTC thermistor has a higher resistance value at higher temperatures. The middle fracture of the chip is consistent with the voltage values of the two ends of the thermistor after voltage division, when the external temperature changes, the resistance value of the thermistor at the two ends of the first terminal CN1 becomes high or low, the voltage at the two ends of the thermistor changes along with the voltage value of the thermistor after voltage division of the first resistor R1, and the interrupt port of the chip performs AD sampling through the change of the voltage value, so that the external temperature is obtained.
Further, in the embodiment of the present application, the power source 40 is a + 5V dc power source. When the thermistor is inserted and mounted through the first terminal CN1 to generate static electricity or generate static electricity due to other factors, the clamping module D can limit the voltage of the static electricity to be not lower than 0V and not higher than 5V when the static electricity reaches the front end of the interrupt port of the chip, so as to ensure that the voltage signal received by the interrupt port of the chip is 0-5V, thereby ensuring that the chip is not broken down, increasing reliability and reducing the risk of electrostatic breakdown.
The present application further provides an air conditioner, where the air conditioner includes the above-mentioned any one of the above-mentioned embodiments, and the specific circuit structure of the above-mentioned temperature detection circuit refers to the above-mentioned embodiments.
The anti-interference temperature detection circuit and the air conditioner provided by the embodiment of the present application are introduced in detail, and a specific example is applied in the present application to explain the principle and the implementation manner of the present application, and the description of the above embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. An anti-interference temperature detection circuit is characterized by comprising a first terminal, a second terminal, a voltage division module, a clamping module and a power supply; the first terminal is used for being externally connected with the thermistor, and the second terminal is used for being connected with the chip; the power supply is sequentially connected with the voltage division module and the first terminal in series and is grounded; the second terminal is connected with the first terminal and the common end of the voltage division module; the clamping module is connected with the voltage dividing module in parallel and is grounded, and the clamping module is used for limiting the voltage signal received by the chip to be lower than the breakdown voltage of the voltage signal.
2. The tamper resistant temperature detection circuit of claim 1, wherein said clamping module comprises a first diode and a second diode, a cathode of said first diode being connected to said voltage divider module and a common terminal of said power supply, and an anode of said first diode being connected to said first terminal and a common terminal of said voltage divider module; and the cathode of the second diode is connected with the first terminal and the common end of the voltage division module, and the anode of the second diode is grounded.
3. The tamper resistant temperature detection circuit of claim 2, wherein the voltage divider module comprises a first resistor.
4. The tamper resistant temperature detection circuit of claim 3, wherein said first terminal comprises a first pin and a second pin, said second pin coupled to said first resistor, said first resistor coupled at another end to said power supply, said first pin coupled to ground.
5. The tamper resistant temperature detection circuit of claim 4, further comprising a second resistor, said second terminal connected to a common terminal of said first resistor and said second pin through said second resistor.
6. The tamper resistant temperature sensing circuit of claim 5 further comprising an electrolytic capacitor, an anode of said electrolytic capacitor connected to said second resistor and a common terminal of said second pin, and a cathode of said electrolytic capacitor connected to said first pin.
7. The tamper resistant temperature detection circuit of claim 6 further comprising a first capacitor, a common terminal of said second terminal and said second resistor being connected to said first pin through said first capacitor.
8. The tamper resistant temperature sensing circuit of claim 1, wherein said thermistor is an NTC thermistor or a PTC thermistor.
9. The tamper resistant temperature detection circuit of claim 1, wherein said power supply is a + 5V dc power supply.
10. An air conditioner comprising a tamper resistant temperature sensing circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121910732.6U CN215931116U (en) | 2021-08-13 | 2021-08-13 | Anti-interference temperature detection circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121910732.6U CN215931116U (en) | 2021-08-13 | 2021-08-13 | Anti-interference temperature detection circuit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215931116U true CN215931116U (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121910732.6U Active CN215931116U (en) | 2021-08-13 | 2021-08-13 | Anti-interference temperature detection circuit and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215931116U (en) |
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2021
- 2021-08-13 CN CN202121910732.6U patent/CN215931116U/en active Active
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