Temperature and humidity detection circuit and temperature and humidity detection device
By introducing an anti-interference step-down driving module into the temperature and humidity detection circuit, the existing temperature and humidity sensing devices have solved the problems of unstable power supply and poor anti-interference ability, and achieved more stable and accurate temperature and humidity detection.
Patent Information
- Application Number
- CN202421570510.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-04
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-07-04
AI Technical Summary
The existing temperature and humidity sensing devices are prone to interference and are extremely unstable, resulting in poor anti-interference ability.
A temperature and humidity detection circuit is designed, including a power input module, an anti-interference step-down drive module and a temperature and humidity detection module. The anti-interference buck driving module realizes stable buck and anti-interference of the initial power supply through a combination of multi-stage buck chip and filter module, ensuring that the temperature and humidity detection module can stably detect the ambient temperature and humidity.
Through the design of the anti-interference step-down driving module, the anti-interference ability of the temperature and humidity detection circuit is significantly improved, ensuring the stability and reliability of the detection circuit, so that the temperature and humidity detection can be carried out more accurately and stably.
Smart Images
Figure CN222689206U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of temperature and humidity detection, and in particular to a temperature and humidity detection circuit and a temperature and humidity detection device. Background Art
[0002] The size of temperature and humidity is closely related to people's lives, such as human comfort, textile manufacturing, medicine manufacturing, food storage, etc., which also promotes the corresponding production of temperature and humidity sensing devices. However, the power supply of existing temperature and humidity sensing devices is easily interfered and extremely unstable. Therefore, the existing temperature and humidity sensing devices have the technical defect of poor anti-interference ability. Utility Model Content
[0003] The purpose of the utility model is to provide a temperature and humidity detection circuit and a temperature and humidity detection device, which can overcome the shortcomings and deficiencies in the prior art.
[0004] An embodiment of the utility model provides a temperature and humidity detection circuit, comprising: a power input module, an anti-interference buck driving module, and a temperature and humidity detection module;
[0005] The power input module is connected to the input end of the buck driving module; the power input module is used to output the initial power to the anti-interference buck driving module;
[0006] The output end of the anti-interference buck driving module is connected to the input end of the temperature and humidity detection module; the anti-interference buck driving module is used to output a stable working power supply after voltage reduction to the temperature and humidity detection module after voltage reduction, so that the temperature and humidity detection module can stably detect the ambient temperature and humidity.
[0007] Further, the temperature and humidity detection module includes a temperature and humidity detection submodule and a signal amplification submodule;
[0008] The input end of the temperature and humidity detection submodule is connected to the input end of the anti-interference buck driving module; the temperature and humidity detection submodule is used to perform temperature and humidity detection according to the working power supply to obtain a temperature and humidity signal;
[0009] The output end of the temperature and humidity detection submodule is connected to the input end of the signal amplification submodule, and the signal amplification submodule is used to amplify the temperature and humidity signal to obtain a temperature and humidity amplified signal.
[0010] Furthermore, the temperature and humidity detection submodule includes a sensor module and a single-chip microcomputer; the single-chip microcomputer includes a temperature signal input terminal and a pulse signal output terminal;
[0011] The output end of the sensor module is connected to the temperature signal input end of the single-chip microcomputer, and the pulse signal output end of the single-chip microcomputer is connected to the input end of the signal amplification submodule; the sensor module is used to detect the ambient temperature and humidity to obtain a temperature and humidity detection signal, and the single-chip microcomputer is used to convert the temperature and humidity detection signal into a temperature and humidity signal in the form of a pulse signal, and output it to the signal amplification submodule.
[0012] Furthermore, the temperature and humidity detection module also includes a temperature and humidity display module;
[0013] The input end of the temperature and humidity display module is connected to the output end of the signal amplifying submodule; the temperature and humidity display module is used to display the temperature and humidity values according to the temperature and humidity amplified signal output by the signal amplifying submodule.
[0014] Further, the anti-interference buck driving module includes a first buck chip, a first filter module, a second buck chip, a second filter module and a third buck chip;
[0015] The input end of the first buck chip is connected to the power input module, and the output end of the first buck chip is connected to the input end of the second buck chip via the first filter module;
[0016] The output end of the second buck chip is connected to the input end of the third buck chip via the second filter module; the output end of the third buck chip is connected to the input end of the temperature and humidity detection module.
[0017] Furthermore, the models of the first buck chip and the second buck chip are both TD1465.
[0018] Furthermore, the model of the third buck chip is XC6219B332MR.
[0019] Furthermore, the first filter module and the second filter module are both LC filter modules.
[0020] Furthermore, the anti-interference buck driving module also includes a third filter module, and the output end of the third buck chip is connected to the input end of the temperature and humidity detection module via the third filter module.
[0021] An embodiment of the present utility model further provides a temperature and humidity detection device, which includes the temperature and humidity detection circuit as described above.
[0022] Compared with the prior art, the utility model can realize stable voltage reduction and stable output of working power after voltage reduction to the temperature and humidity detection module through the anti-interference buck driving module, so that the temperature and humidity detection module can stably detect the ambient temperature and humidity. Among them, the anti-interference buck driving module can include a first buck chip, a first filter module, a second buck chip, a second filter module and a third buck chip, the first buck chip is connected to the second buck chip via the first filter module, and the second buck chip is connected to the third buck chip via the second filter module, so that the output of the first buck chip and the second buck chip is filtered by the first filter module and the second filter module respectively, so as to improve the stability of the output of the first buck chip and the second buck chip, and the first buck chip and the second buck chip themselves also have excellent anti-interference ability, specifically, the first buck chip and the second buck chip are both TD1465, therefore, under the combination of the buck chip and the filter module, the anti-interference ability of the temperature and humidity detection circuit can be better improved.
[0023] In order to more clearly understand the present invention, the specific implementation of the present invention will be described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 The figure is a schematic diagram of module connection of a temperature and humidity detection circuit according to an embodiment of the present utility model.
[0025] Figure 2 The figure is a schematic diagram of a temperature and humidity detection module of a temperature and humidity detection circuit according to an embodiment of the present invention.
[0026] Figure 3 The present invention is a circuit diagram of an anti-interference buck driving module of a temperature and humidity detection circuit according to an embodiment of the present invention.
[0027] Figure 4 This is a circuit diagram of a sensor module of a temperature and humidity detection circuit according to an embodiment of the present invention.
[0028] Figure 5 The present invention is a circuit diagram of a single chip microcomputer of a temperature and humidity detection circuit according to an embodiment of the present invention.
[0029] Figure 6 The present invention is a circuit diagram of a signal amplifying submodule of a temperature and humidity detection circuit according to an embodiment of the present invention.
[0030] Figure 7 This is a schematic diagram of a temperature and humidity detection device according to an embodiment of the present invention.
[0031] 1. Temperature and humidity detection circuit; 11. Power input module; 13. Anti-interference buck drive module; 15. Temperature and humidity detection module; 151. Temperature and humidity detection submodule; 153. Signal amplification submodule; 10. Temperature and humidity detection device. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0033] See also Figure 1 , which is a module connection diagram of a temperature and humidity detection circuit 1 of an embodiment of the utility model. The temperature and humidity detection circuit 1 of the utility model includes: a power input module 11, an anti-interference buck driving module 13, and a temperature and humidity detection module 15;
[0034] The power input module 11 is connected to the input end of the buck driving module; the power input module 11 is used to output the initial power to the anti-interference buck driving module 13;
[0035] The output end of the anti-interference buck driving module 13 is connected to the input end of the temperature and humidity detection module 15; the anti-interference buck driving module 13 is used to output a stable working power supply after voltage reduction to the temperature and humidity detection module 15 after voltage reduction processing of the initial power supply, so that the temperature and humidity detection module 15 can stably detect the ambient temperature and humidity.
[0036] See also Figure 2 In a feasible embodiment, the temperature and humidity detection module 15 includes a temperature and humidity detection submodule 151 and a signal amplification submodule 153;
[0037] The input end of the temperature and humidity detection submodule 151 is connected to the input end of the anti-interference buck driving module 13; the temperature and humidity detection submodule 151 is used to perform temperature and humidity detection according to the working power supply to obtain a temperature and humidity signal;
[0038] The output end of the temperature and humidity detection submodule 151 is connected to the input end of the signal amplification submodule 153 , and the signal amplification submodule 153 is used to amplify the temperature and humidity signal to obtain a temperature and humidity amplified signal.
[0039] In a feasible embodiment, the temperature and humidity detection submodule 151 includes a sensor module and a single-chip microcomputer; the single-chip microcomputer includes a temperature signal input terminal and a pulse signal output terminal;
[0040] The output end of the sensor module is connected to the temperature signal input end of the single-chip microcomputer, and the pulse signal output end of the single-chip microcomputer is connected to the input end of the signal amplification submodule 153; the sensor module is used to detect the ambient temperature and humidity to obtain a temperature and humidity detection signal, and the single-chip microcomputer is used to convert the temperature and humidity detection signal into a temperature and humidity signal in the form of a pulse signal, and output it to the signal amplification submodule 153.
[0041] In a feasible embodiment, the temperature and humidity detection module 15 further includes a temperature and humidity display module;
[0042] The input end of the temperature and humidity display module is connected to the output end of the signal amplifying submodule 153 ; the temperature and humidity display module is used to display the temperature and humidity values according to the temperature and humidity amplified signal output by the signal amplifying submodule 153 .
[0043] In a feasible embodiment, the anti-interference buck driving module 13 includes a first buck chip, a first filter module, a second buck chip, a second filter module and a third buck chip;
[0044] The input end of the first buck chip is connected to the power input module 11, and the output end of the first buck chip is connected to the input end of the second buck chip via the first filter module;
[0045] The output end of the second buck chip is connected to the input end of the third buck chip via the second filter module; the output end of the third buck chip is connected to the input end of the temperature and humidity detection module 15.
[0046] In a feasible embodiment, the models of the first buck chip and the second buck chip are both TD1465.
[0047] In a feasible embodiment, the model of the third buck chip is XC6219B332MR.
[0048] In a feasible embodiment, both the first filter module and the second filter module are LC filter modules.
[0049] In a feasible embodiment, the anti-interference buck driving module 13 further includes a third filter module, and the output end of the third buck chip is connected to the input end of the temperature and humidity detection module 15 via the third filter module.
[0050] The circuit diagram of the temperature and humidity detection circuit 1 of the utility model is as follows Figure 3-6 As shown, Figure 3 A circuit diagram of an anti-interference buck driving module 13 of a temperature and humidity detection circuit 1 according to an embodiment of the present utility model; Figure 4A circuit diagram of a sensor module of a temperature and humidity detection circuit 1 according to an embodiment of the present invention; Figure 5 A circuit diagram of a single chip microcomputer of a temperature and humidity detection circuit 1 according to an embodiment of the utility model; Figure 6 1 is a circuit diagram of a signal amplifying submodule 153 of a temperature and humidity detection circuit 1 according to an embodiment of the present invention.
[0051] See also Figure 3 , the first buck chip of the present application is U1, the second buck chip is U14, and the third buck chip is U3. The sixth corner SW of the first buck chip is a power switch output, which is powered by the LC filter module (first filter module) composed of capacitor C2 and inductor L1 for the second buck chip; and the sixth corner SW of the second buck chip is also a power switch output, which is powered by the LC filter module (first filter module) composed of capacitor C25 and inductor L2 for the third buck chip. Among them, Figure 3 As shown, the sixth corner SW of the first buck chip is also grounded via a resistor R51 and a capacitor C5, and the sixth corner SW of the first buck chip is also grounded via a diode D6. The fifth corner IN of the second buck chip is also grounded via multiple capacitors, such as capacitor EC2, capacitor C4, capacitor EC3, etc. The inductor L1 is also connected to the fifth corner IN of the second buck chip through an inductor B2, wherein the inductor L1 and the inductor L2 can use different types of inductors. The sixth corner SW of the second buck chip is also grounded via a resistor R68 and a capacitor C26, and the second buck chip is also grounded via a diode D4. The first corner VIN of the third buck chip is also grounded via multiple capacitors, such as capacitor EC4, capacitor C27, capacitor C6, and capacitor C8. The inductor L2 is also connected to the first corner VIN of the third buck chip through an inductor B3, and the first corner VIN of the third buck chip can also be grounded via a point-in R7 and a light-emitting diode H1. When the first buck chip, the second buck chip and the third buck chip of the anti-interference buck driving module 13 are all working properly, the electrical signal output by the second buck chip passes through the light-emitting diode H1, making the light-emitting diode H1 light up, so as to inform the user whether the anti-interference buck driving module 13 is working properly through the light signal. The inductor B8 connected to the fifth corner VOUT of the third buck chip and the related capacitors C10, C7 and C11 can also form an LC filter (third filtering module) to filter the working power output by the third buck chip.
[0052] See also Figure 4 and Figure 5 , the sensor module is U8, and the single chip is U9. The 5th corner VDD of the sensor module is connected to the output end of the third buck chip, the 1st corner and the 4th corner of the sensor module are connected to the 11th corner and the 12th corner of the single chip respectively, and the 13th corner and the 14th corner of the single chip are connected to the signal amplification submodule 153 respectively.
[0053] See also Figure 6 The signal amplification submodule 153 includes a plurality of operational amplifiers, such as operational amplifier U4.A, operational amplifier U4.B, operational amplifier U4.C and operational amplifier U4.D. Among them, the second corner of the operational amplifier U4.A is connected to the system ground via the resistor R8, the third corner of the operational amplifier U4.A is connected to the 14th corner of the single-chip computer, the first corner of the operational amplifier U4.A is connected to the first end of the resistor R15, the second end of the resistor R15 is connected to the system ground via the resistor R63, the resistor R9 and the resistor R8, and the second end of the resistor R15 is also connected to the ground via the capacitor C15; the second end of the resistor R15 is also connected to the first end of the resistor R44, the second end of the resistor R44 is connected to the system ground via the capacitor C18, and the second end of the resistor R44 is also connected to the system ground and the output end of the first buck chip U1 via the Schottky diode D7.
[0054] The 5th corner of the operational amplifier U4.B is connected to the 1st corner of the operational amplifier U4.A via resistors R16 and R15. The 5th corner of the operational amplifier U4.B is also connected to the first end of the resistor R10. The second end of the resistor R10 is connected to the first end of the resistor R46. The second end of the resistor R46 is connected to the second end of the resistor R44. The 6th corner of the operational amplifier U4.B is connected to the system ground via resistor R20. The 7th corner of the operational amplifier U4.B is connected to the base of the transistor Q1 via resistor R17. The collector of the transistor Q1 is connected to the output end of the first buck chip U1. The emitter of the transistor Q1 is connected to the first end of the resistor R46 via resistor R19. The emitter of the transistor Q1 is also connected to the system ground via resistors R21 and R20.
[0055] The 13th corner of the operational amplifier U4.C is connected to the system ground via resistor R22, the 12th corner of the operational amplifier U4.C is connected to the 1322nd corner of the single-chip computer, the 14th corner of the operational amplifier U4.C is connected to the first end of the resistor R30, the second end of the resistor R30 is connected to the system ground via resistor R64, resistor R23 and resistor R8, and the second end of the resistor R30 is also grounded via capacitor C22; the second end of the resistor R30 is also connected to the first end of the resistor R45, the second end of the resistor R44 is connected to the system ground via capacitor C19, and the second end of the resistor R45 is also connected to the system ground and the output end of the first buck chip U1 respectively via Schottky diode D8.
[0056] The 10th corner of the operational amplifier U4.D is connected to the 1st corner of the operational amplifier U4.C via resistors R16 and R30. The 10th corner of the operational amplifier U4.D is also connected to the first end of the resistor R24. The second end of the resistor R24 is connected to the first end of the resistor R80. The second end of the resistor R80 is connected to the second end of the resistor R45. The 9th corner of the operational amplifier U4.D is connected to the system ground via resistor R34. The 8th corner of the operational amplifier U4.D is connected to the base of the transistor Q2 via resistor R32. The collector of the transistor Q2 is connected to the output end of the first buck chip U1. The emitter of the transistor Q2 is connected to the first end of the resistor R80 via resistor R33. The emitter of the transistor Q2 is also connected to the system ground via resistors R35 and R34.
[0057] Compared with the prior art, the utility model can realize stable voltage reduction and stable output of the working power after voltage reduction to the temperature and humidity detection module 15 through the anti-interference voltage reduction driving module 13, so that the temperature and humidity detection module 15 can stably detect the ambient temperature and humidity. Among them, the anti-interference voltage reduction driving module 13 may include a first voltage reduction chip, a first filter module, a second voltage reduction chip, a second filter module and a third voltage reduction chip, the first voltage reduction chip is connected to the second voltage reduction chip via the first filter module, and the second voltage reduction chip is connected to the third voltage reduction chip via the second filter module, so that the output of the first voltage reduction chip and the second voltage reduction chip is filtered by the first filter module and the second filter module respectively, so as to improve the stability of the output of the first voltage reduction chip and the second voltage reduction chip, and the first voltage reduction chip and the second voltage reduction chip themselves also have excellent anti-interference ability, specifically, the first voltage reduction chip and the second voltage reduction chip are both TD1465, therefore, under the combination of the voltage reduction chip and the filter module, the anti-interference ability of the temperature and humidity detection circuit 1 can be better improved.
[0058] See also Figure 7 An embodiment of the present utility model further provides a temperature and humidity detection device 10, wherein the temperature and humidity detection device 10 includes the temperature and humidity detection circuit 1 as described above.
[0059] The temperature and humidity detection device 10 provided in the second embodiment of the present application has the same concept as the temperature and humidity detection circuit 1 in the first embodiment of the present application. The implementation process thereof is detailed in the method embodiment and will not be repeated here.
[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A temperature and humidity detection circuit, characterized in that: include: Power input module, anti-interference step-down drive module, temperature and humidity detection module; The power input module is connected to the input end of the buck driving module; the power input module is used to output the initial power to the anti-interference buck driving module; The output end of the anti-interference buck driving module is connected to the input end of the temperature and humidity detection module; the anti-interference buck driving module is used to output a stable working power supply after voltage reduction to the temperature and humidity detection module after voltage reduction, so that the temperature and humidity detection module can stably detect the ambient temperature and humidity.
2. The temperature and humidity detection circuit according to claim 1, characterized in that: The temperature and humidity detection module includes a temperature and humidity detection submodule and a signal amplification submodule; The input end of the temperature and humidity detection submodule is connected to the input end of the anti-interference buck driving module; The temperature and humidity detection submodule is used to perform temperature and humidity detection according to the working power supply to obtain a temperature and humidity signal; The output end of the temperature and humidity detection submodule is connected to the input end of the signal amplification submodule, and the signal amplification submodule is used to amplify the temperature and humidity signal to obtain a temperature and humidity amplified signal.
3. The temperature and humidity detection circuit according to claim 2, characterized in that: The temperature and humidity detection submodule includes a sensor module and a single-chip microcomputer; the single-chip microcomputer includes a temperature signal input terminal and a pulse signal output terminal; The output end of the sensor module is connected to the temperature signal input end of the single chip microcomputer, and the pulse signal output end of the single chip microcomputer is connected to the input end of the signal amplification submodule; The sensor module is used to detect the ambient temperature and humidity to obtain a temperature and humidity detection signal, and the single chip microcomputer is used to convert the temperature and humidity detection signal into a temperature and humidity signal in the form of a pulse signal and output it to the signal amplification submodule.
4. The temperature and humidity detection circuit according to claim 2, characterized in that: The temperature and humidity detection module also includes a temperature and humidity display module; The input end of the temperature and humidity display module is connected to the output end of the signal amplifying submodule; the temperature and humidity display module is used to display the temperature and humidity values according to the temperature and humidity amplified signal output by the signal amplifying submodule.
5. The temperature and humidity detection circuit according to claim 1, characterized in that: The anti-interference buck driving module includes a first buck chip, a first filter module, a second buck chip, a second filter module and a third buck chip; The input end of the first buck chip is connected to the power input module, and the output end of the first buck chip is connected to the input end of the second buck chip via the first filter module; The output end of the second buck chip is connected to the input end of the third buck chip via the second filter module; the output end of the third buck chip is connected to the input end of the temperature and humidity detection module.
6. The temperature and humidity detection circuit according to claim 5, characterized in that: Models of the first buck chip and the second buck chip are both TD1465.
7. The temperature and humidity detection circuit according to claim 5, characterized in that: The model of the third buck chip is XC6219B332MR.
8. The temperature and humidity detection circuit according to claim 5, characterized in that: The first filter module and the second filter module are both LC filter modules.
9. The temperature and humidity detection circuit according to claim 5, characterized in that: The anti-interference buck driving module also includes a third filter module, and the output end of the third buck chip is connected to the input end of the temperature and humidity detection module via the third filter module.
10. A temperature and humidity detection device, characterized in that: The temperature and humidity detection device comprises the temperature and humidity detection circuit according to any one of claims 1 to 9.