Carbon dioxide detection circuit

Abstract

The utility model provides a carbon dioxide detection circuit. The carbon dioxide detection circuit comprises a power supply input module, an anti-interference voltage reduction driving module, a carbon dioxide detection module, a detection signal amplification module and a carbon dioxide data display module, the power supply input module is connected with the input end of the step-down driving module; the output end of the anti-interference voltage reduction driving module is connected with the input end of the carbon dioxide detection module; the anti-interference voltage reduction driving module is used for outputting a stable working power supply after voltage reduction to the carbon dioxide detection module, so that the carbon dioxide detection module stably detects carbon dioxide in the environment to output a carbon dioxide detection signal; the detection signal amplification module and the carbon dioxide data display module are respectively connected with the carbon dioxide detection module, and the detection signal amplification module is used for amplifying a carbon dioxide detection signal output by the carbon dioxide detection module and outputting the signal; the carbon dioxide data display module is used for displaying carbon dioxide data according to the carbon dioxide detection signal output by the carbon dioxide detection module.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon dioxide detection, and particularly relates to a carbon dioxide detection circuit. Background Art

[0002] In the environment, the concentration of carbon dioxide affects people's health. Even when the concentration of carbon dioxide is relatively high, it will threaten people's life safety. This has also promoted the corresponding generation of carbon dioxide detection devices. However, the power supply of existing carbon dioxide detection devices is easily interfered with and extremely unstable, which easily leads to poor stability of the carbon dioxide detection results. Moreover, existing carbon dioxide detection devices cannot have multiple functions such as outputting carbon dioxide detection signals and displaying carbon dioxide data at the same time. Therefore, existing carbon dioxide detection devices have technical defects such as poor stability of carbon dioxide detection results and single functions. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the disadvantages and deficiencies in the prior art, and provide a carbon dioxide detection device that can stably detect carbon dioxide, and can also output carbon dioxide detection signals and display carbon dioxide data at the same time, increasing the functionality of the circuit.

[0004] An embodiment of the utility model provides a carbon dioxide detection circuit, including:

[0005] A power input module, an anti-interference step-down drive module, a carbon dioxide detection module, a detection signal amplification module, and a carbon dioxide data display module;

[0006] The power input module is connected to the input end of the step-down drive module; the power input module is used to output an initial power supply to the anti-interference step-down drive module;

[0007] The output end of the anti-interference step-down drive module is connected to the input end of the carbon dioxide detection module; the anti-interference step-down drive module is used to perform step-down processing on the initial power supply and then output a stable working power supply after step-down to the carbon dioxide detection module, so that the carbon dioxide detection module stably detects the carbon dioxide in the environment to output a carbon dioxide detection signal;

[0008] The detection signal amplification module and the carbon dioxide data display module are respectively connected to the carbon dioxide detection module. The detection signal amplification module is used to amplify the carbon dioxide detection signal output by the carbon dioxide detection module and then output it externally. The carbon dioxide data display module is used to display carbon dioxide data according to the carbon dioxide detection signal output by the carbon dioxide detection module.

[0009] Further, the anti-interference step-down driving module includes a first step-down chip, a first filtering module, a second step-down chip, a second filtering module, and a third step-down chip;

[0010] The input end of the first step-down chip is connected to the power input module, and the output end of the first step-down chip is connected to the input end of the second step-down chip via the first filtering module;

[0011] The output end of the second step-down chip is respectively connected to the input end of the third step-down chip and the power input end of the carbon dioxide detection module via the second filtering module; the output end of the third step-down chip is connected to the power input end of the carbon dioxide data display module.

[0012] Further, the output end of the first step-down chip is connected to the detection signal amplification module via the first filtering module.

[0013] Further, the detection signal amplification module includes an electrical signal input end, a carbon dioxide detection signal input end, an operational amplifier chip, a carbon dioxide current output end, and a carbon dioxide voltage output end; the operational amplifier chip includes a first input end, a second input end, a first output end, and a second output end;

[0014] The carbon dioxide detection signal input end is connected to the first input end of the operational amplifier chip, the electrical signal input end is connected to the second input end of the operational amplifier chip, the first output end of the operational amplifier chip is connected to the carbon dioxide current output end, and the second output end of the operational amplifier chip is connected to the carbon dioxide voltage output end.

[0015] Further, the model of the operational amplifier chip is LM258DR.

[0016] Further, the model of the first step-down chip is LM317DCYR.

[0017] Further, the model of the second step-down chip is L7805ACUTR.

[0018] Further, the model of the third step-down chip is XC6219B332MR.

[0019] Further, the anti-interference step-down driving module further includes a third filtering module, and the output end of the third step-down chip is connected to the power input end of the carbon dioxide data display module via the third filtering module.

[0020] Further, the first filtering module, the second filtering module, and the third filtering module all include a plurality of filtering capacitors.

[0021] Compared with the prior art, the utility model can achieve stable voltage reduction and stably output the working power supply after voltage reduction to the carbon dioxide detection module through the anti-interference voltage reduction driving module, so that the carbon dioxide detection module stably detects the environmental carbon dioxide. Among them, the anti-interference voltage reduction driving module may include a first voltage reduction chip, a first filtering module, a second voltage reduction chip, a second filtering module and a third voltage reduction chip. The first voltage reduction chip is connected to the second voltage reduction chip via the first filtering module, and the second voltage reduction chip is connected to the third voltage reduction chip via the second filtering module, so as to filter the outputs of the first voltage reduction chip and the second voltage reduction chip through the first filtering module and the second filtering module respectively to improve the stability of the outputs of the first voltage reduction chip and the second voltage reduction chip. Moreover, the first voltage reduction chip and the second voltage reduction chip itself also have excellent anti-interference capabilities. Specifically, the model number of the first voltage reduction chip is LM317DCYR, the model number of the second voltage reduction chip is L7805ACUTR, and the model number of the third voltage reduction chip is XC6219B332MR. Therefore, with the combination of the voltage reduction chip and the filtering module, the anti-interference ability of the temperature and humidity detection circuit can be better improved.

[0022] In order to understand the utility model more clearly, the specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings. Brief Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the carbon dioxide detection circuit according to an embodiment of the utility model.

[0024] Figure 2 It is a circuit diagram of the anti-interference voltage reduction driving module of the carbon dioxide detection circuit according to an embodiment of the utility model.

[0025] Figure 3 It is a circuit diagram of the carbon dioxide detection module of the carbon dioxide detection circuit according to an embodiment of the utility model.

[0026] Figure 4 It is a circuit diagram of the detection signal amplification module of the carbon dioxide detection circuit according to an embodiment of the utility model.

[0027] Figure 5 It is a circuit diagram of the carbon dioxide data display module of the carbon dioxide detection circuit according to an embodiment of the utility model.

[0028] 1. Carbon dioxide detection circuit; 11. Power input module; 13. Anti-interference voltage reduction driving module; 15. Carbon dioxide detection module; 17. Detection signal amplification module; 19. Carbon dioxide data display module. Specific Embodiments

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0030] Please refer to Figure 1 , which is a schematic diagram of a carbon dioxide detection circuit 1 according to an embodiment of the present utility model, including:

[0031] A power input module 11, an anti-interference step-down driving module 13, a carbon dioxide detection module 15, a detection signal amplification module 17, and a carbon dioxide data display module 19;

[0032] The power input module 11 is connected to the input end of the step-down driving module; the power input module 11 is used to output an initial power supply to the anti-interference step-down driving module 13;

[0033] The output end of the anti-interference step-down driving module 13 is connected to the input end of the carbon dioxide detection module 15; the anti-interference step-down driving module 13 is used to perform step-down processing on the initial power supply and then output a stable working power supply after step-down to the carbon dioxide detection module 15, so that the carbon dioxide detection module 15 stably detects the carbon dioxide in the environment to output a carbon dioxide detection signal;

[0034] The detection signal amplification module 17 and the carbon dioxide data display module 19 are respectively connected to the carbon dioxide detection module 15. The detection signal amplification module 17 is used to amplify the carbon dioxide detection signal output by the carbon dioxide detection module 15 and then output it externally. The carbon dioxide data display module 19 is used to display carbon dioxide data according to the carbon dioxide detection signal output by the carbon dioxide detection module 15.

[0035] Please refer to Figure 2 , in a feasible embodiment, the anti-interference step-down driving module 13 includes a first step-down chip, a first filtering module, a second step-down chip, a second filtering module, and a third step-down chip;

[0036] The input end of the first step-down chip is connected to the power input module 11, and the output end of the first step-down chip is connected to the input end of the second step-down chip via the first filtering module;

[0037] The output terminal of the second step-down chip is respectively connected to the input terminal of the third step-down chip and the power input terminal of the carbon dioxide detection module 15 via the second filtering module; the output terminal of the third step-down chip is connected to the power input terminal of the carbon dioxide data display module 19.

[0038] Specifically, the first step-down chip is as Figure 2 shown by U3. The model of the first step-down chip is LM317DCYR. The power input module 11 is connected to the 3rd pin of the first step-down chip via diode D1 and fuse F1; the 4th pin of the first step-down chip is connected to the input terminal of the second step-down chip via the first filtering module. The 4th pin of the first step-down chip is also connected to the 3rd pin of the first step-down chip via diode D3. And the 1st pin of the first step-down chip is grounded via parallel resistors R1, R2, R3, R4 and parallel capacitor C1. The 2nd pin of the first step-down chip is respectively connected to one end of the parallel capacitor C1 via resistor R5 and diode D2, and the other end of the parallel capacitor C1 is grounded.

[0039] The first filtering module includes capacitor C3, capacitor EC2 and capacitor C4. Among them, one end of capacitor C3, capacitor EC2 and capacitor C4 is connected to the 4th pin of the first step-down chip, and the other end of capacitor C3, capacitor EC2 and capacitor C4 is grounded.

[0040] The second step-down chip is as Figure 2 shown by U5. The model of the second step-down chip is L7805ACUTR. The 3rd pin of the second step-down chip is connected to the 4th pin of the first step-down chip. The 2nd pin of the second step-down chip is grounded. The 1st pin of the second step-down chip is connected to the input terminal of the third step-down chip via the second filtering module.

[0041] The second filtering module includes capacitor C5, capacitor EC3 and capacitor C6. Among them, one end of capacitor C5, capacitor EC3 and capacitor C6 is connected to the 1st pin of the second step-down chip, and the other end of capacitor C5, capacitor EC3 and capacitor C6 is grounded.

[0042] The third step-down chip is as Figure 2 shown by U6. The model of the third step-down chip is XC6219B332MR. The 1st pin of the third step-down chip is connected to the 1st pin of the second step-down chip. The 2nd pin of the third step-down chip is grounded. The 3rd pin of the third step-down chip is connected to the 1st pin of the second step-down chip via resistor R8. The 5th pin of the third step-down chip is connected to the input terminal of the carbon dioxide detection module 15.

[0043] In a feasible embodiment, the anti-interference buck driving module 13 further includes a third filtering module, and the output end of the third buck chip is connected to the power input end of the carbon dioxide data display module 19 via the third filtering module.

[0044] Among them, the third filtering module includes a capacitor C7 and a capacitor C8. One end of the capacitor C7 and the capacitor C8 is connected to the 5th pin of the third filtering module, and the other end of the capacitor C7 and the capacitor C8 is grounded.

[0045] In summary, the first filtering module, the second filtering module, and the third filtering module all include several filtering capacitors.

[0046] Please refer to Figure 3 , the carbon dioxide detection module 15 is as shown by U15 in Figure 3 . The 1st pin of the second buck chip is connected to the 6th pin of the carbon dioxide detection module 15 via the second filtering module; the 9th pin of the carbon dioxide detection module 15 is connected to the signal input end of the detection signal amplification module 17, and the 2nd pin and the 3rd pin of the carbon dioxide detection module 15 are respectively connected to the signal input ends of the carbon dioxide data display module 19.

[0047] Please refer to Figure 4 , in a feasible embodiment, the output end of the first buck chip is connected to the detection signal amplification module 17 via the first filtering module.

[0048] Among them, the detection signal amplification module 17 includes an electrical signal input end, a carbon dioxide detection signal input end, an operational amplifier chip, a carbon dioxide current output end, and a carbon dioxide voltage output end; the operational amplifier chip includes a first input end, a second input end, a first output end, and a second output end;

[0049] The carbon dioxide detection signal input end is connected to the first input end of the operational amplifier chip, the electrical signal input end is connected to the second input end of the operational amplifier chip, the first output end of the operational amplifier chip is connected to the carbon dioxide current output end, and the second output end of the operational amplifier chip is connected to the carbon dioxide voltage output end.

[0050] Specifically, the operational amplifier chip is as shown by Figure 4As shown by U1 in FIG. 0, the operational amplifier chip has a model number of LM258DR. The third pin of the operational amplifier chip is sequentially connected to the ninth pin of the carbon dioxide detection module 15 via resistor R21 and resistor R20. Among them, both ends of resistor R21 are also grounded via capacitor C18 and capacitor C17 respectively, and the ninth pin of the carbon dioxide detection module 15 is grounded via resistor R22. The first pin of the operational amplifier chip is connected to fuse F2 via resistor R10 to serve as the carbon dioxide voltage output terminal CO2_U_OUT. The first pin of the operational amplifier chip is also grounded via capacitor C12 and resistor R16. Fuse F2 is grounded via resistor R13 and resistor R16. The second pin of the operational amplifier chip is grounded via resistor R16.

[0051] The eighth pin of the operational amplifier chip is connected to the output terminal of the first buck chip. The seventh pin of the operational amplifier chip is connected to the base of transistor Q1 via resistor R15. The collector of transistor Q1 is connected to the output terminal of the first buck chip via resistor R14. The emitter of transistor Q1 is connected to the sixth pin of the operational amplifier chip via resistor R19. The sixth pin of the operational amplifier chip is grounded via resistor R9. The emitter of transistor Q1 is also connected to the fifth pin of the operational amplifier chip via resistor R17 and resistor R18. The emitter of transistor Q1 is also connected to fuse F3 via resistor R17 to serve as the carbon dioxide current output terminal CO2_I_OUT. Specifically, the carbon dioxide voltage output terminal is connected to Schottky diode D5 via fuse F2, and the carbon dioxide current output terminal is connected to Schottky diode D6 via fuse F3.

[0052] Please refer to Figure 5 , the carbon dioxide data display module 19 includes a single-chip microcomputer and a liquid crystal display device. Among them, the liquid crystal interface of the liquid crystal display device is as shown by Figure 5 FPC1 in FIG., and the single-chip microcomputer is as shown by Figure 5 U2 in FIG.. The model of the single-chip microcomputer can adopt STM32G030F6P6TR. Specifically, the fourth pin of the single-chip microcomputer is connected to the output terminal of the third buck chip. The fourth pin of the single-chip microcomputer is grounded via capacitor C14 and capacitor C15 respectively. The fourth pin of the single-chip microcomputer is also grounded via resistor R13 and capacitor C16. The fourth pin of the single-chip microcomputer is also connected to the sixth pin of the single-chip microcomputer via resistor R13. The ninth pin and the tenth pin of the single-chip microcomputer are respectively connected to the second pin and the third pin of the carbon dioxide detection module 15. The first pin, the second pin, and the third pin of the single-chip microcomputer are respectively connected to the third pin, the fourth pin, and the fifth pin of the liquid crystal interface of the liquid crystal display device, and the sixth pin of the liquid crystal interface of the liquid crystal display device is connected to the output terminal of the third buck chip.

[0053] Compared with the prior art, the utility model can achieve stable voltage reduction and stably output the working power supply after voltage reduction to the carbon dioxide detection module through the anti-interference voltage reduction driving module, so that the carbon dioxide detection module stably detects the ambient carbon dioxide. Among them, the anti-interference voltage reduction driving module may include a first voltage reduction chip, a first filtering module, a second voltage reduction chip, a second filtering module and a third voltage reduction chip. The first voltage reduction chip is connected to the second voltage reduction chip via the first filtering module, and the second voltage reduction chip is connected to the third voltage reduction chip via the second filtering module, so as to filter the outputs of the first voltage reduction chip and the second voltage reduction chip through the first filtering module and the second filtering module respectively to improve the stability of the outputs of the first voltage reduction chip and the second voltage reduction chip. Moreover, the first voltage reduction chip and the second voltage reduction chip itself also have excellent anti-interference capabilities. Specifically, the model of the first voltage reduction chip is LM317DCYR, the model of the second voltage reduction chip is L7805ACUTR, and the model of the third voltage reduction chip is XC6219B332MR. Therefore, with the combination of the voltage reduction chips and the filtering modules, the anti-interference ability of the temperature and humidity detection circuit can be better improved.

[0054] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A carbon dioxide detection circuit, characterized in that, Including: A power input module, an anti-interference step-down drive module, a carbon dioxide detection module, a detection signal amplification module, and a carbon dioxide data display module; The power input module is connected to the input end of the step-down drive module; the power input module is used to output an initial power supply to the anti-interference step-down drive module; The output end of the anti-interference step-down drive module is connected to the input end of the carbon dioxide detection module; the anti-interference step-down drive module is used to perform step-down processing on the initial power supply and then output a stable working power supply after step-down to the carbon dioxide detection module, so that the carbon dioxide detection module stably detects the carbon dioxide in the environment to output a carbon dioxide detection signal; The detection signal amplification module and the carbon dioxide data display module are respectively connected to the carbon dioxide detection module. The detection signal amplification module is used to amplify the carbon dioxide detection signal output by the carbon dioxide detection module and then output it externally. The carbon dioxide data display module is used to display carbon dioxide data according to the carbon dioxide detection signal output by the carbon dioxide detection module.

2. The carbon dioxide detection circuit according to claim 1, characterized in that: The anti-interference step-down drive module includes a first step-down chip, a first filter module, a second step-down chip, a second filter module, and a third step-down chip; The input end of the first step-down chip is connected to the power input module, and the output end of the first step-down chip is connected to the input end of the second step-down chip via the first filter module; The output end of the second step-down chip is connected to the input end of the third step-down chip and the power input end of the carbon dioxide detection module via the second filter module respectively; the output end of the third step-down chip is connected to the power input end of the carbon dioxide data display module.

3. The carbon dioxide detection circuit according to claim 2, characterized in that: The output end of the first step-down chip is connected to the detection signal amplification module via the first filter module.

4. The carbon dioxide detection circuit according to claim 3, wherein: The detection signal amplification module includes an electrical signal input end, a carbon dioxide detection signal input end, an operational amplifier chip, a carbon dioxide current output end, and a carbon dioxide voltage output end; the operational amplifier chip includes a first input end, a second input end, a first output end, and a second output end; The carbon dioxide detection signal input end is connected to the first input end of the operational amplifier chip, the electrical signal input end is connected to the second input end of the operational amplifier chip, the first output end of the operational amplifier chip is connected to the carbon dioxide current output end, and the second output end of the operational amplifier chip is connected to the carbon dioxide voltage output end.

5. The carbon dioxide detection circuit according to claim 4, characterized in that: The model of the operational amplifier chip is LM258DR.

6. The carbon dioxide detection circuit according to claim 2, wherein: The model of the first step-down chip is LM317DCYR.

7. The carbon dioxide detection circuit according to claim 2, wherein: The model of the second step-down chip is L7805ACUTR.

8. The carbon dioxide detection circuit according to claim 2, wherein: The model of the third step-down chip is XC6219B332MR.

9. The carbon dioxide detection circuit according to claim 2, wherein: The anti-interference step-down drive module further includes a third filter module, and the output end of the third step-down chip is connected to the power input end of the carbon dioxide data display module via the third filter module.

10. The carbon dioxide detection circuit according to claim 9, wherein: The first filter module, the second filter module, and the third filter module all include a plurality of filter capacitors.

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