Gas detection device

Abstract

The invention provides a gas detection device which comprises a detection module, an analog-digital conversion module, a processing module and a power module, the detection module can detect gas concentration information and generate a first analog detection signal according to the detected concentration information; the analog-digital conversion module can convert the first analog detection signal into a first digital detection signal; the processing module can judge whether gas leakage occurs or not according to the first digital detection signal; the gas detection device comprises a power supply voltage, the power supply voltage supplies power to the detection module, the analog-digital conversion module and the processing module, and the power supply module can convert an external alternating current voltage into the power supply voltage, or the power supply module can convert an external direct current voltage into the power supply voltage. The gas detection device can be suitable for scenes of direct current power supply and alternating current power supply.

Description

Technical Field

[0001] The present application relates to the field of thermal management technology, and in particular to a gas detection device. Background Art

[0002] A gas detection device is a device that detects the concentration of a specific gas in the environment. In the related art, the gas detection device can only be applied to scenarios where alternating current is used as the power supply mode, that is, the gas detection device can only use alternating current as the power source, and its application scenarios are limited. Summary of the invention

[0003] The present application provides a gas detection device with a wider range of application scenarios.

[0004] The present application discloses a gas detection device, comprising: a detection module, an analog-to-digital conversion module, a processing module and a power supply module, wherein:

[0005] The detection module can detect gas concentration information and generate a first analog detection signal according to the detected concentration information; the analog-to-digital conversion module can convert the first analog detection signal into a first digital detection signal; the processing module can determine whether a gas leak occurs according to the first digital detection signal; the gas detection device includes a power supply voltage, the power supply voltage supplies power to the detection module, the analog-to-digital conversion module and the processing module, the power supply module can convert an external AC voltage into the power supply voltage, or the power supply module can convert an external DC voltage into the power supply voltage.

[0006] The power module in the gas detection device can accept two possible power supply modes, direct current and alternating current, and convert them into power supply voltages for powering each module, thereby making the gas detection device more widely applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the principle of an embodiment of the gas detection device of the present application;

[0008] Figure 2 This is a schematic diagram of another embodiment of the gas detection device of the present application;

[0009] Figure 3 A circuit diagram of an embodiment of the detection module of the present application;

[0010] Figure 4 This is a schematic diagram of the principle of another embodiment of the gas detection device of the present application;

[0011] Figure 5A This is a circuit diagram of an embodiment of the alarm module of the present application;

[0012] Figure 5B This is a circuit diagram of another embodiment of the alarm module of the present application;

[0013] Figure 6 This is a schematic diagram of the principle of another embodiment of the gas detection device of the present application;

[0014] Figure 7 This is a schematic diagram of the principle of another embodiment of the gas detection device of the present application;

[0015] Figure 8 A circuit diagram of another embodiment of the detection module of the present application;

[0016] Fig. 9A A circuit diagram of another embodiment of the detection module of the present application;

[0017] Fig. 9B A circuit diagram of another embodiment of the detection module of the present application;

[0018] Fig.10 This is a schematic diagram of the principle of another embodiment of the gas detection device of the present application;

[0019] Fig.11 A circuit diagram of an embodiment of a reset module of the present application;

[0020] Fig.12 A circuit diagram of an embodiment of the power module of the present application;

[0021] Fig.13 This is a schematic diagram of the principle of another embodiment of the gas detection device of the present application;

[0022] Fig.14 A circuit diagram of an embodiment of the communication module of the present application;

[0023] Fig.15 This is a circuit diagram of an embodiment of the processing module of the present application. DETAILED DESCRIPTION

[0024] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0025] At present, gas detection devices can only be used in scenarios where alternating current is used as the power supply method, and the applicable scenarios are limited.

[0026] For example, in air conditioning systems, refrigerants such as R32 and R-290 are used for cooling. In order to prevent the leakage of the refrigerant used in the air conditioning system, a gas detection device can be installed in the air conditioning system to detect whether the refrigerant in the air conditioning system has leaked in real time. Since the gas detection device can only be powered by AC power, the air conditioning system must provide AC power for the gas detection device.

[0027] To this end, the present application proposes a gas detection device that can be applied to both AC and DC power supply modes, thereby expanding the applicable scenarios of the gas detection device. The gas detection device of the present application can be used to detect slightly flammable refrigerant gas.

[0028] Figure 1 This is a schematic diagram of the principle of an embodiment of the gas detection device of the present application, as shown in Figure 1 As shown, the device includes: a detection module 110, an analog-to-digital conversion module 120, a processing module 130 and a power supply module 140.

[0029] The first output end of the detection module 110 is connected to the first input end of the analog-to-digital conversion module 120, the first output end of the analog-to-digital conversion module 120 is connected to the first input end of the processing module 130, and the output end of the power supply module 140 is respectively connected to the power supply voltage receiving end of the detection module 110, the analog-to-digital conversion module 120 and the processing module 130.

[0030] The detection module 110 is used to detect gas concentration information and generate a first analog detection signal according to the detected concentration information. Optionally, the amplitude of the first analog detection signal is positively correlated with the gas concentration information.

[0031] The analog-to-digital conversion module 120 is configured to convert the first analog detection signal into a first digital detection signal.

[0032] The processing module 130 is used to determine whether a gas leakage occurs according to the first digital detection signal.

[0033] The power supply module 140 is used to convert a DC voltage or an AC voltage into a power supply voltage, and to supply power to the detection module 110 , the analog-to-digital conversion module 120 , and the processing module 140 through the power supply voltage.

[0034] In order to detect whether gas (such as refrigerant) in the air-conditioning system is leaking more promptly and accurately, the gas sensor in the detection module 110 can be set near the gas transmission pipeline in the air-conditioning system, so that the detection module 110 can detect the concentration of gas in the air near the gas transmission pipeline, generate a corresponding first analog detection signal, and then determine whether the gas in the air-conditioning system is leaking through the processing module 130.

[0035] In a possible implementation, a first threshold value may be preset in the processing module 130, and the processing module 130 may be specifically used to determine whether the amplitude value of the first digital detection signal exceeds the first threshold value, and if it does not exceed the first threshold value, determine that the gas has not leaked, and if it exceeds the first threshold value, determine that the gas has leaked. Among them, the concentration of gas in the air generally needs to reach a certain value, which can also be called a critical value, and then it is easy to explode when exposed to heat or open flames. Therefore, the first threshold value can be set according to the amplitude of the first analog detection signal generated when the detection module 110 is located in a gas with a gas concentration at a critical value. For greater safety, the first threshold value can be less than the amplitude of the first analog detection signal corresponding to the critical value of the above-mentioned gas concentration. The specific value of the first threshold value is not limited in this application.

[0036] Figure 1 The implementation circuit of the analog-to-digital conversion module can refer to the analog-to-digital conversion circuit implementation in the related art, and the embodiments of the present application are not limited thereto.

[0037] See also Figure 2 As shown, in another gas leakage detection device provided in the present application, the detection module 110 and the analog-to-digital conversion module 120 may also include: a first amplification and filtering module 210, which is used to amplify and filter the first analog detection signal output by the detection module 110 to obtain a second analog detection signal; at this time, the analog-to-digital conversion module 120 can be specifically used to: convert the second analog detection signal output by the first amplification and filtering module 210 into a first digital detection signal.

[0038] Figure 2 The implementation circuits of the first amplification and filtering module 210 and the analog-to-digital conversion module 120 are not limited in this application.

[0039] In a possible implementation, the above Figure 1 and Figure 2 The detection module 110 shown in FIG. Figure 3 The circuit structure shown is implemented, the circuit includes: a first capacitor C1, a gas sensor U1, and a first resistor R1; wherein,

[0040] The first end of the first capacitor C1 is electrically connected to the power supply voltage terminal VCC, and the second end is electrically connected to the analog ground terminal AGND; the gas sensor U1 includes a heating power supply terminal A1, a probe power supply terminal A2, a heating ground terminal A4 and a signal output terminal A3. The heating power supply terminal A1 and the probe power supply terminal A2 of the gas sensor U1 are electrically connected to the power supply voltage terminal VCC respectively, the heating ground terminal A4 is electrically connected to the analog ground terminal AGND, and the signal output terminal A3 serves as the first output terminal OUT1 of the detection module 110. The signal output terminal A3 is electrically connected to the first end of the first resistor R1, and the second end of the first resistor R1 is electrically connected to the analog ground terminal AGND. The first output terminal OUT1 of the detection module 110 is used to output a first analog detection signal Vout1.

[0041] Among them, the probe of the gas sensor U1 can be a semiconductor type, an infrared optical type, an electrochemical type, a solid electrolyte type, a catalytic combustion type, etc.

[0042] The analog ground terminal AGND and the ground terminal GND may be electrically connected via a 0 ohm resistor or inductor.

[0043] right Figure 3 The working principle is explained as follows: when the concentration of gas in the air in the space where the gas sensor U1 is located gradually increases, the resistance between the probe power supply terminal A2 and the signal output terminal A3 gradually decreases, so that the voltage output by the first output terminal OUT1 gradually increases, that is, the voltage amplitude of the first analog detection signal Vout1 gradually increases.

[0044] Optionally, the first resistor R1 can be a variable resistor. At this time, when the gas sensor characteristic data such as the first threshold is calibrated before the gas detection device leaves the factory, in order to ensure the detection accuracy of the detection module, when the gas sensor is in a target gas of a specified concentration, such as 5000PPM of R32 gas, by directly adjusting the first resistor R1, the amplitude of the voltage signal output by the detection module can be at a reasonable value such as 50% VCC, not too large such as 95% VCC, and not too small such as 2% VCC, so that the detection accuracy of the detection module 110 for the target gas is relatively higher. Compared with the calibration method of manually replacing a suitable resistor when the first resistor R1 is not adjustable, by setting the first resistor R1 as a variable resistor, the calibration can be made simpler.

[0045] See also Figure 4 As shown, the gas detection device of the present application may further include: an alarm module 150. At this time, the processing module 130 may also be used to: if it is determined that a gas leak occurs, send an alarm signal to the alarm module 150. The alarm module 150 may be used to: respond to the alarm signal and issue an alarm. Optionally, the alarm may be an audible and / or visual alarm.

[0046] The power module 140 may also be used to supply power to the alarm module 150 .

[0047] In one possible implementation, Figure 4 If the alarm module 150 shown in FIG. 1 uses a visual alarm, it can be Figure 5A The structure shown in the figure is implemented. At this time, the alarm module 150 may include: a second resistor R2, a third resistor R3, a fourth resistor R4, a first transistor Q1 and a first photodiode PD1; wherein,

[0048] The first input terminal IN1 of the alarm module 150 is electrically connected to the first end of the second resistor R2, and the second end of the second resistor R2 is electrically connected to the base of the first transistor Q1; the base of the first transistor Q1 is electrically connected to the first end of the third resistor R3, the emitter of the first transistor Q1 is electrically connected to the second end of the third resistor R3, and the emitter of the first transistor Q1 is electrically connected to the ground terminal GND; the first end of the fourth resistor R4 is electrically connected to the power supply voltage terminal VCC, and the second end of the fourth resistor R4 is electrically connected to the anode of the first photodiode PD1; the cathode of the first photodiode PD1 is electrically connected to the collector of the first transistor Q1.

[0049] In another possible implementation, the above Figure 1 and Figure 2 If the alarm module 140 shown in FIG. 1 uses a sound alarm, it can be Figure 5B The structure shown in the figure is implemented. At this time, the alarm module 150 may include: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second transistor Q2, a first inductor L1 and a bell LS1; wherein,

[0050] The second input terminal IN2 of the alarm module 140 is electrically connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is electrically connected to the base of the second transistor Q2; the base of the second transistor Q2 is electrically connected to the first end of the sixth resistor R6, the emitter of the second transistor Q2 is electrically connected to the second end of the sixth resistor R6, and the emitter of the second transistor Q2 is electrically connected to the ground terminal GND; the first end of the seventh resistor R7 is electrically connected to the power supply voltage terminal VCC, and the second end of the seventh resistor R7 is electrically connected to the first end of the first inductor L1; the second end of the first inductor L1 is electrically connected to the collector of the second transistor Q2, and the bell LS1 is connected in parallel with the first inductor L1.

[0051] In another possible implementation, the above Figure 4 If the alarm module 150 shown in FIG. 1 uses a combination of visual and audio to give an alarm, the implementation structure of the alarm module 150 can be as follows: Figure 5A and Figure 5BThe circuit structure shown is combined and will not be described here; at this time, the alarm signal output by the processing module 130 to the alarm module 150 may include a first alarm signal output to the first input terminal IN1 of the alarm module 150 and a second alarm signal output to the second input terminal IN2 of the alarm module 150, and the first alarm signal and the second alarm signal may be the same or different.

[0052] Different from Figure 1 The gas detection device shown in Figure 6 In another embodiment of the gas detection device of the present application shown, the detection module 110 may also be used to: generate a first analog reference signal;

[0053] At this time, the analog-to-digital conversion module 120 may also be used to: convert the first analog reference signal into a first digital reference signal;

[0054] The processing module 130 may be specifically configured to compare the first digital detection signal with the first digital reference signal, and determine that a gas leak occurs if the first digital detection signal is greater than the first digital reference signal.

[0055] Among them, the processing module 130 can read the amplitude value of the first digital detection signal and the amplitude value of the first digital reference signal in serial manner in accordance with a preset period, and compare the sizes of the two amplitude values ​​read. If within the preset time length, the amplitude value of the first digital detection signal read each time is greater than the amplitude value of the first digital reference signal, the processing module 130 can determine that the first digital detection signal is greater than the first digital reference signal within the preset time length, and send an alarm signal to the alarm module.

[0056] Different from Figure 6 The gas detection device shown in Figure 7 In another embodiment of the gas detection device of the present application shown, the detection module 110 and the analog-to-digital conversion module 120 may also include: a second amplification and filtering module 710, which is used to amplify and filter the first analog detection signal and the first analog reference signal output by the detection module 110, respectively, to obtain a second analog detection signal and a second analog reference signal, respectively; at this time, the analog-to-digital conversion module 120 can be specifically used to: convert the second analog detection signal output by the second amplification and filtering module 710 into a first digital detection signal, and convert the second analog reference signal output by the second amplification and filtering module 710 into a first digital reference signal.

[0057] Figure 7 The implementation circuits of the second amplification and filtering module 710 and the analog-to-digital conversion module 120 are not limited in this application.

[0058] In a possible implementation, the above Figure 6 and Figure 7 The detection module 110 shown in FIG. Figure 8 The circuit structure shown is realized. Figure 8 The circuit structure of the detection module 110 shown is relatively Figure 3 The circuit structure shown adds the following structure: the first end of the ninth resistor R9 is electrically connected to the power supply voltage terminal VCC, the second end of the ninth resistor R9 is electrically connected to the first end of the tenth resistor R10, and the second end of the tenth resistor R10 is electrically connected to the analog ground terminal AGND; the second end of the ninth resistor R9 serves as the second output terminal OUT2 of the detection module 110, and the second output terminal OUT2 is used to output the first analog reference signal Vref1.

[0059] At this time, the first analog reference signal Vref1 is equal to the first analog reference signal Vref1 outputted from the first output terminal Vout1 of the detection module 110 under the following conditions: the detection module detects target gas at a specified concentration (eg, less than or equal to the explosion threshold).

[0060] Optionally, the detection module 110 may be specifically configured to: detect temperature and / or humidity information, and generate a first analog reference signal according to the detected temperature and / or humidity information.

[0061] At this time, the above Figure 6 and Figure 7 The detection module 110 shown in FIG. 1 can be implemented by, for example, Fig. 9A The circuit structure shown is realized. Fig. 9A The circuit structure of the detection module 110 shown is relatively Figure 8 The circuit structure shown is additionally provided with the following structure: the temperature and / or humidity sensor S1 is connected in parallel with the ninth resistor R9.

[0062] Optionally, the circuit structure shown in 9A can be further transformed into, for example Fig. 9B In the circuit structure shown, the ninth resistor R9 is split into an eleventh resistor R11 and a twelfth resistor R12 connected in series, and the temperature and / or humidity sensor S1 can be connected in parallel with the eleventh resistor R11 or the twelfth resistor R12.

[0063] Fig. 9A and Fig. 9B In the embodiment, the temperature and / or humidity sensor S1 can be arranged near the gas sensor to detect the temperature and / or humidity near the gas sensor. At this time, the resistance of the temperature and / or humidity sensor S1 changes with the change of temperature and / or humidity, so that the first analog reference signal also changes accordingly. Figure 8 The first analog reference signal in the detection module 110 is constant. Fig. 9AThe first analog reference signal and the first analog detection signal output by the detection module 110 shown are both subject to the same temperature and humidity influences, thereby enabling the processing module 130 to eliminate the temperature and humidity influences when determining whether the gas is leaking, making the processing module 130's determination of whether the gas is leaking more accurate.

[0064] It should be noted that Fig. 9A and Fig. 9B The temperature and / or humidity sensor S1 is implemented by a resistive sensor for example only. The temperature and / or humidity sensor S1 may also be implemented by a capacitive sensor, which is not limited in the embodiments of the present application.

[0065] Above Figure 6 and Figure 7 The system may further include an alarm module. The implementation of the alarm module can refer to the aforementioned description of the alarm module 150, which will not be repeated here.

[0066] In another embodiment of the gas detection device of the present application, the gas detection device of the present application may further include: a reset module. Fig.10 China-Israel Figure 7 The gas detection device shown is taken as an example in which the above-mentioned reset module is added.

[0067] The reset module 1010 may be used to: detect a reset operation by a user, and after detecting the reset operation, send a reset signal to the processing module 130;

[0068] Accordingly, the processing module 130 can also be used to: in response to a reset signal, clear the received first digital detection signal, and after a preset first time period, restart to determine whether a gas leak occurs based on the newly received first digital detection signal.

[0069] The power module 140 may also be used to supply power to the reset module 1010 .

[0070] Optionally, if the gas detection device includes an alarm module, the processing module 130 may also be configured to: in response to a reset signal, stop sending an alarm signal to the alarm module.

[0071] Among them, the specific value of the first duration is not limited in this application.

[0072] In a possible implementation, the implementation structure of the reset module 1010 may be as follows: Fig.11 As shown, including:

[0073] The first end of the button SB1 is electrically connected to the power supply voltage terminal VCC, and the second end of the button SB1 is connected to the first end of the fourteenth resistor R14; the second end of the fourteenth resistor R14 is grounded, and the first end of the fourteenth resistor R14 is electrically connected to the first end of the thirteenth resistor R13; the second end of the thirteenth resistor R13 is electrically connected to the output end of the reset module 1010, and is also electrically connected to the first end of the second capacitor C2; the second end of the second capacitor C2 is grounded.

[0074] In this circuit structure, if the user does not press button SB1, the output voltage of the output terminal OUT is 0, which is a low-level signal. Once the user presses button SB1, the voltage signal output by the output terminal OUT is greater than 0, thereby outputting a high-level signal, that is, a reset signal.

[0075] In this embodiment, the user can use the reset module 1010 to restore the gas detection device of the present application to the state before the alarm, and restart the gas detection after a certain period of time.

[0076] The power module 140 in the above embodiment can be Fig.12 The structure shown in the figure includes: a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifteenth resistor R15, a voltage regulator chip U2 and a sixteenth resistor R16, wherein:

[0077] The first input terminal of the power module 140 is electrically connected to the anode of the first diode D1, the cathode of the first diode D1 is electrically connected to the anode of the second diode D2, the cathode of the second diode D2 is electrically connected to the second input terminal of the power module 140, the first input terminal of the power module 140 is electrically connected to the anode of the third diode D3, the cathode of the third diode D3 is electrically connected to the anode of the fourth diode D4, the cathode of the fourth diode D4 is electrically connected to the second input terminal of the power module 140; the anode of the fourth diode D4 is grounded; the anode of the second diode D2 is connected to the input terminal of the voltage regulator chip U2;

[0078] The output end of the voltage stabilizing chip U2 is electrically connected to the first end of the fifteenth resistor R15, the second end of the fifteenth resistor R15 is electrically connected to the feedback end of the voltage stabilizing chip U2, the feedback end of the voltage stabilizing chip U2 is electrically connected to the first end of the sixteenth resistor R16, the second end of the sixteenth resistor R16 is grounded; the ground end of the voltage stabilizing chip U2 is grounded;

[0079] The output end of the voltage stabilizing chip U2 is connected to the output end of the power module 140 , and the output end of the power module 140 is used to output a power supply voltage.

[0080] In this structure, the input between the first input terminal IN141 and the second input terminal IN142 may be direct current or alternating current. In a possible implementation, the direct current voltage may be 12V, and the alternating current voltage may be 24V.

[0081] Optionally, in order to make the output power supply voltage VCC more stable, see Fig.12 As shown, the power module 140 may further include: a third capacitor C3, and / or a fourth capacitor C4, and / or a fifth capacitor C5, and / or a sixth capacitor C6, wherein the anode of the second diode D2 is electrically connected to the first end of the third capacitor C3, and the second end of the third capacitor C3 is grounded; and / or, the anode of the second diode D2 is electrically connected to the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is grounded; and / or, the anode of the second diode D2 is electrically connected to the first end of the fifth capacitor C5, and the second end of the fifth capacitor C5 is grounded; and / or, the anode of the second diode D2 is electrically connected to the first end of the sixth capacitor C6, and the second end of the sixth capacitor C6 is grounded;

[0082] and / or,

[0083] The power module 140 may further include: a seventh capacitor C7, wherein the output end of the voltage regulator chip U2 is electrically connected to the first end of the seventh capacitor C7, and the second end of the seventh capacitor C7 is electrically connected to the bootstrap voltage input end of the voltage regulator chip U2;

[0084] and / or,

[0085] The power module 140 may further include: a second inductor L2 , wherein the output end of the voltage regulator chip U2 is electrically connected to the first end of the second inductor L2 , and the second end of the second inductor L2 is electrically connected to the output end of the power module 140 .

[0086] Fig.12 The output terminal OUT141 of the power module 140 shown can also be electrically connected to the first end of the eighteenth resistor R18, the second end of the eighteenth resistor R18 is electrically connected to the anode of the second photodiode PD2, and the cathode of the second photodiode PD2 is electrically connected to the ground terminal GND, so that when the power module 140 outputs the power supply voltage, the second photodiode PD2 emits light to provide a power supply prompt for the power module.

[0087] Fig.12 In the power module 140 shown, in order to reduce the output current of the output terminal OUT141, the output terminal of the voltage regulator chip U2 can also be electrically connected to the first end of the seventeenth resistor R17, and the second end of the seventeenth resistor R17 is electrically connected to the output terminal OUT141.

[0088] Optionally, in order to further increase the power supply that can be connected to the power module 140, the power module 140 may further include: a fifth diode D5, wherein:

[0089] The third input terminal IN143 of the power module 140 is electrically connected to the anode of the fifth diode D5 , the fourth input terminal IN144 is electrically connected to the ground terminal GND, and the cathode of the fifth diode D5 is electrically connected to the output terminal OUT141 of the power module 140 .

[0090] Ignoring the conduction voltage drop of the fifth diode D5, the input voltage between the third input terminal IN143 and the fourth input terminal IN144 of the power module 140 is equal to the power voltage output by the output terminal 141 of the power module 140. For example, if the power voltage output by the output terminal OUT141 of the power module 140 is a 5V DC voltage, a 5V DC voltage can be input between the third input terminal IN143 and the fourth input terminal IN144.

[0091] Optionally, in order to make the output power supply voltage VCC more stable, see Fig.12 As shown, the power module 140 may also include: the cathode of the fifth diode D5 is electrically connected to the anode of the Zener diode ZD1, the cathode of the Zener diode ZD1 is grounded GND, and / or, the cathode of the fifth diode D5 is electrically connected to the first end of the ninth capacitor C9, the second end of the ninth capacitor C9 is grounded, and / or, the cathode of the fifth diode D5 is electrically connected to the first end of the tenth capacitor C10, and the second end of the tenth capacitor C10 is grounded.

[0092] In another embodiment of the gas detection device of the present application, the processing module 130 of the gas detection device of the present application can also be used to: determine whether a gas leakage occurs, and execute a preset process corresponding to the gas leakage.

[0093] The purpose of executing the preset processing corresponding to the gas leakage may be to prevent further leakage of the gas in the air-conditioning system, and the preset processing may include but is not limited to: stopping the operation of the compressor in the air-conditioning system, closing the valve of the gas transmission pipeline, etc. At this time, the processing module 130 may send a control signal to the compressor for instructing the compressor to stop running, and stop the compressor from running, and send a control signal to the valve of the gas transmission pipeline for instructing the valve to close, so as to close the valve.

[0094] In the above example, the processing module 130 of the gas detection device not only completes the gas detection, but also completes the control function of the compressor and the valve of the gas transmission pipeline in the air-conditioning system.

[0095] In another embodiment of the gas detection device of the present application, the air-conditioning system in which the gas detection device is located may include a control module 1310. At this time, the processing module 130 of the gas detection device of the present application may also be used to: determine whether a gas leakage has occurred and send a control signal to the control module 1310; the control signal is used to instruct the control module 1310 to perform preset processing corresponding to the gas leakage.

[0096] The preset processing executed by the control module 1210 may include but is not limited to: stopping the operation of the compressor, closing the valve of the gas transmission pipeline, etc.

[0097] Through the above processing, in the event of a gas leak, the preset processing can be automatically performed on the air-conditioning system to reduce the risk of using the air-conditioning system.

[0098] The communication between the processing module 130 and the control module 1310 can be realized through a communication module 1320, the input end of the communication module 1320 is connected to the processing module 130, and the output end of the communication module 1320 is connected to the control module 1310, so as to realize the transmission of control signals between the two modules. The power module 140 can also be used to supply power to the communication module 1320 ( Fig.13 not shown).

[0099] Among them, the possible implementation of the communication module 1320 is as follows: Fig.14 As shown, including:

[0100] The first input terminal of the communication module 1320 is electrically connected to the first end of the nineteenth resistor R19, the second end of the nineteenth resistor R19 is electrically connected to the driver input terminal DI of the communication chip U3, the first output terminal of the communication module 1320 is electrically connected to the first end of the twentieth resistor R20, the second end of the twentieth resistor R20 is electrically connected to the receiver output terminal RO of the communication chip U3; the receiver output enable terminal of the communication chip U3 It is electrically connected to the first end of the twenty-first resistor R21, and the second end of the twenty-first resistor R21 is electrically connected to the analog ground terminal AGND; the driver output enable terminal DE of the communication chip U3 is electrically connected to the first end of the twenty-second resistor R22, and the second end of the twenty-second resistor R22 is electrically connected to the power supply voltage terminal VCC; the power supply voltage terminal VCC of the communication chip U3 is electrically connected to the power supply voltage terminal VCC, and is also electrically connected to the first end of the eleventh capacitor C11, and the second end of the eleventh capacitor C11 is electrically connected to the analog ground terminal AGND; the ground terminal GND is electrically connected to the analog ground terminal AGND; the inverting output terminal A / Y of the communication chip U3 is electrically connected to the first end of the twenty-third resistor R23, and the in-phase output terminal B / Z is electrically connected to the second end of the twenty-third resistor R23, and the inverting output terminal A / Y and the in-phase output terminal B / Z of the communication chip U3 also serve as the first output terminal A and the second output terminal B of the communication module 1320, respectively.

[0101] In a possible implementation, the processing module in the gas detection device of the present application can be implemented by a single chip microcomputer. Fig.15 , shows a processing module implemented by a single-chip microcomputer model R5F10268ASP, the processing module comprising:

[0102] Pin P42 serves as the first input terminal of the processing module, and is used to receive the first digital detection signal Vout1; pin P41 serves as the second input terminal of the processing module 130, and is used to receive the first digital reference signal Vref1; pin P23 serves as the first output terminal of the processing module 130, and is used to output the first alarm signal LED; pin P10 serves as the second output terminal of the processing module 130, and is used to output the second alarm signal Buzzer; pin P60 serves as the third input terminal of the processing module 130, and is used to receive the reset signal RESET-Switch.

[0103] In a possible implementation, the processing module 130 can also be used to: determine whether the zero point reset condition is met, obtain the amplitude values ​​of several sampling points in the first digital detection signal received within a specified time, and calculate a new sampling comparison zero point according to the obtained amplitude values. Through this processing, the processing module can automatically complete the self-calibration of the sampling comparison zero point, improve the detection accuracy of the detection device, and extend the life of the detection device.

[0104] The present application provides an air conditioning system, comprising Figure 1 to Figure 15 The gas detection device provided in any embodiment. The above-mentioned air conditioning system can be a vehicle air conditioning system, a refrigerator, etc. using a refrigerant.

[0105] It should be understood that the division of the various modules of the above device is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. And these modules can all be implemented in the form of software calling through processing elements; they can also be all implemented in the form of hardware; some modules can also be implemented in the form of software calling through processing elements, and some modules can be implemented in the form of hardware. For example, the processing module can be a separately established processing element, or it can be integrated in a chip of the air-conditioning system. The implementation of other modules is similar. In addition, all or part of these modules can be integrated together, or they can be implemented independently. In the implementation process, each step of the above method or each of the above modules can be completed by the hardware integrated logic circuit in the processor element or the instructions in the form of software.

[0106] In the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0107] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0108] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0109] In several embodiments provided in the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), disk or optical disk, and other media that can store program codes.

[0110] The above is only a specific implementation of the present application. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A gas detection device, characterized in that: include: A detection module (110), an analog-to-digital conversion module (120), a processing module (130) and a power supply module (140), wherein: The detection module (110) is capable of detecting gas concentration information and generating a first analog detection signal according to the detected concentration information; the analog-to-digital conversion module (120) is capable of converting the first analog detection signal into a first digital detection signal; the processing module (130) is capable of judging whether a gas leak occurs according to the first digital detection signal; the gas detection device comprises a power supply voltage, the power supply voltage supplies power to the detection module (110), the analog-to-digital conversion module (120) and the processing module (130); the power supply module (140) is capable of converting an external AC voltage into the power supply voltage, or the power supply module (140) is capable of converting an external DC voltage into the power supply voltage.

2. The gas detection device according to claim 1, characterized in that: The power module (140) comprises: a first diode (D1), a second diode (D2), a third diode (D3), and a fourth diode (D4), wherein: The first input end of the power module (140) is electrically connected to the anode of the first diode (D1), the cathode of the first diode (D1) is electrically connected to the anode of the second diode (D2), the cathode of the second diode (D2) is electrically connected to the second input end of the power module (140), the first input end of the power module (140) is electrically connected to the anode of the third diode (D3), the cathode of the third diode (D3) is electrically connected to the anode of the fourth diode (D4), and the cathode of the fourth diode (D4) is electrically connected to the second input end of the power module (140); the anode of the fourth diode (D4) is grounded; and the anode of the second diode (D2) is connected to the output end of the power module (140).

3. The gas detection device according to claim 2, characterized in that: The power module (140) comprises: a fifteenth resistor (R15), a sixteenth resistor (R16) and a voltage stabilizing chip (U2), wherein: The anode of the second diode (D2) is connected to the input end of the voltage stabilizing chip (U2), the output end of the voltage stabilizing chip (U2) is electrically connected to the first end of the fifteenth resistor (R15), the second end of the fifteenth resistor (R15) is electrically connected to the feedback end of the voltage stabilizing chip (U2), the feedback end of the voltage stabilizing chip (U2) is electrically connected to the first end of the sixteenth resistor (R16), the second end of the sixteenth resistor (R16) is grounded; the ground end of the voltage stabilizing chip (U2) is grounded; The output end of the voltage stabilizing chip (U2) is electrically connected to the output end of the power module (140), and the output end of the power module (140) is used to output the power supply voltage.

4. The gas detection device according to claim 2, characterized in that: The power module (140) further includes: a fifth diode (D5), wherein: The third input terminal of the power module (140) is electrically connected to the anode of the fifth diode (D5), the fourth input terminal of the power module (140) is grounded, and the cathode of the fifth diode (D5) is electrically connected to the output terminal of the power module (140).

5. The gas detection device according to claim 2, characterized in that: The power module (140) further includes: a third capacitor (C3), and / or a fourth capacitor (C4), and / or a fifth capacitor (C5), and / or a sixth capacitor (C6), wherein the anode of the second diode (D2) is electrically connected to the first end of the third capacitor (C3), and the second end of the third capacitor (C3) is grounded; and / or the anode of the second diode (D2) is electrically connected to the first end of the fourth capacitor (C4), and the second end of the fourth capacitor (C4) is grounded; and / or the anode of the second diode (D2) is electrically connected to the first end of the fifth capacitor (C5), and the second end of the fifth capacitor (C5) is grounded; and / or the anode of the second diode (D2) is electrically connected to the first end of the sixth capacitor (C6), and the second end of the sixth capacitor (C6) is grounded; and / or, The power module (140) further comprises: a seventh capacitor (C7), wherein the output end of the voltage stabilizing chip (U2) is electrically connected to the first end of the seventh capacitor (C7), and the second end of the seventh capacitor (C7) is electrically connected to the bootstrap voltage input end of the voltage stabilizing chip (U2); and / or, The power module (140) further comprises: a second inductor (L2), wherein the output end of the voltage stabilizing chip (U2) is electrically connected to the first end of the second inductor (L2), and the second end of the second inductor (L2) is electrically connected to the output end of the power module (140).

6. The gas detection device according to claim 4, characterized in that: The power module further includes: a voltage stabilizing diode (ZD1), and / or a ninth capacitor (C9), and / or a tenth capacitor (C10), wherein: The cathode of the fifth diode (D5) is electrically connected to the cathode of the voltage-stabilizing diode (ZD1), and the anode of the voltage-stabilizing diode (ZD1) is grounded; and / or, the cathode of the fifth diode (D5) is electrically connected to the first end of the ninth capacitor (C9), and the second end of the ninth capacitor (C9) is grounded; and / or, the cathode of the fifth diode (D5) is electrically connected to the first end of the tenth capacitor (C10), and the second end of the tenth capacitor (C10) is grounded.

7. The gas detection device according to any one of claims 1 to 6, characterized in that: The detection module comprises: a first capacitor (C1), a gas sensor (U1) and a first resistor (R1), wherein: The first end of the first capacitor (C1) is electrically connected to the power supply voltage end (VCC), and the second end of the first capacitor (C1) is electrically connected to the analog ground end (AGND); the gas sensor (U1) comprises a heating power supply end (A1), a probe power supply end (A2), a heating ground end (A4) and a signal output end (A3); the heating power supply end (A1) and the probe power supply end (A2) of the gas sensor (U1) are electrically connected to the power supply voltage end (VCC), respectively, the heating ground end (A4) is electrically connected to the analog ground end (AGND), the signal output end (A3) is electrically connected to the first end of the first resistor (R1), and the second end of the first resistor (R1) is electrically connected to the analog ground end (AGND); the signal output end (A3) of the gas sensor (U1) also serves as the first output end (OUT1) of the detection module (110), and the first output end (OUT1) is used to output the first analog detection signal.

8. The gas detection device according to claim 7, characterized in that: The detection module further includes: a ninth resistor (R9) and a tenth resistor (R10), wherein: The first end of the ninth resistor (R9) is electrically connected to the power supply voltage terminal (VCC), the second end of the ninth resistor (R9) is electrically connected to the first end of the tenth resistor (R10), the second end of the tenth resistor (R10) is electrically connected to the analog ground terminal (AGND), and the second end of the ninth resistor (R9) serves as the second output terminal (OUT2) of the detection module (110), and the second output terminal (OUT2) is used to output the first analog reference signal; the detection module also includes: a temperature and / or humidity sensor (S1), wherein, The temperature and / or humidity sensor (S1) is connected in parallel with the ninth resistor (R9).

9. The gas detection device according to claim 7, characterized in that: The first resistor is a variable resistor.

10. The gas detection device according to claim 1, characterized in that: The device also includes an alarm module (150); The processing module (130) is further used to: if it is determined that a gas leak occurs, send an alarm signal to the alarm module (150); The alarm module (150) comprises: a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a first triode (Q1) and a first photodiode (PD1), wherein a first input terminal of the alarm module (150) is electrically connected to a first terminal of the second resistor (R2), a second terminal of the second resistor (R2) is electrically connected to a base of the first triode (Q1), a base of the first triode (Q1) is electrically connected to a first terminal of the third resistor (R3), an emitter of the first triode (Q1) is electrically connected to a second terminal of the third resistor (R3), and an emitter of the first triode (Q1) is grounded; a power supply voltage terminal (VCC) is electrically connected to a first terminal of the fourth resistor (R4), a second terminal of the fourth resistor (R4) is electrically connected to an anode of the first photodiode (PD1), and a cathode of the first photodiode (PD1) is electrically connected to a collector of the first triode (Q1); and / or, The alarm module (150) comprises: a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), a second transistor (Q2), a first inductor (L1) and an electric bell (LS1), wherein the second input end of the alarm module (150) is electrically connected to the first end of the fifth resistor (R5), the second end of the fifth resistor (R5) is electrically connected to the base of the second transistor (Q2), and the base of the second transistor (Q2) is also electrically connected to the first end of the sixth resistor (R6). The emitter of the second transistor (Q2) is electrically connected to the second end of the sixth resistor (R6), and the emitter of the second transistor (Q2) is grounded; the power supply voltage terminal (VCC) is electrically connected to the first end of the seventh resistor (R7), the second end of the seventh resistor (R7) is electrically connected to the first end of the first inductor (L1), the second end of the first inductor (L1) is electrically connected to the collector of the second transistor (Q2), and the bell (LS1) is connected in parallel with the first inductor (L1).

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