Detection circuit and aerosol-generating device

Abstract

The utility model provides a detection circuit and an aerosol generating device, the detection circuit comprises a sensing circuit and a processor, the sensing circuit comprises at least one resistor, and the at least one resistor responds to the suction air pressure change of the aerosol generating device to change the self resistance value. The sensing circuit can output a first voltage signal and a second voltage signal with a potential difference value based on the resistance values of the at least one resistor under different air pressures, and meanwhile, the processor is electrically connected to the sensing circuit; and the processor is used for receiving the first voltage signal and the second voltage signal to detect the suction air pressure of the aerosol generating device, so that the anti-interference capability of the detection circuit is further improved, the stability of the detection circuit is enhanced, and the accuracy of the monitoring result of the detection circuit is further ensured.

Description

Technical Field

[0001] The present application relates to the technical field of electronic atomization, and in particular to a detection circuit and an aerosol generating device. Background Art

[0002] Nowadays, when a user inhales an aerosol generating device, the gas flow rate and pressure inside the aerosol generating device will change. A gas sensor is usually set in the aerosol generating device to monitor the flow rate and pressure changes of the internal gas, and the aerosol generating device can adaptively change the internal values ​​according to the changes, thereby further improving the user experience. However, the existing gas sensors have poor anti-interference ability, resulting in inaccurate monitoring results. Utility Model Content

[0003] The present application provides a detection circuit and an aerosol generating device to solve the problem that the existing gas sensor has poor anti-interference ability, thereby causing inaccurate monitoring results.

[0004] In a first aspect, an embodiment of the present application provides a detection circuit for detecting the inhalation pressure of an aerosol generating device, the detection circuit comprising:

[0005] a sensing circuit, the sensing circuit comprising at least one resistor, the at least one resistor changing its resistance value in response to a change in the inhaled air pressure of the aerosol generating device, the sensing circuit outputting a first voltage signal and a second voltage signal having a potential difference value based on the resistance value of the at least one resistor under different air pressures;

[0006] A processor is electrically connected to the sensor circuit, and the processor is used to receive the first voltage signal and the second voltage signal to detect the inhaled air pressure of the aerosol generating device.

[0007] In one embodiment, the sensing circuit has a first output terminal and a second output terminal, the first output terminal is used to output a first voltage signal, and the second output terminal is used to output a second voltage signal;

[0008] The detection circuit also includes a differential operational amplifier, which has a first input terminal and a second input terminal; the first output terminal of the sensor circuit is connected to the first input terminal of the differential operational amplifier, the second output terminal of the sensor circuit is connected to the second input terminal of the differential operational amplifier, and the first output terminal and the second output terminal of the differential operational amplifier are both connected to the processor.

[0009] In one embodiment, the differential operational amplifier further includes a first output terminal and a second output terminal, and the first output terminal and the second output terminal of the differential operational amplifier are both connected to the processor.

[0010] In one embodiment, the detection circuit includes a first resistor, a first end of the first resistor is connected to a first output end of the sensing circuit, and a second end of the first resistor is connected to a first output end of the differential operational amplifier.

[0011] In one embodiment, the detection circuit further includes a second resistor, a first end of the second resistor is connected to the second output end of the sensing circuit, and a second end of the second resistor is connected to the second output end of the differential operational amplifier.

[0012] In one embodiment, the sensing circuit includes a third resistor and a fourth resistor, the first end of the third resistor and the first end of the fourth resistor are both connected to a positive ground power supply, and the second end of the third resistor and the second end of the fourth resistor are both connected to a processor.

[0013] In one embodiment, the sensing circuit further includes a fifth resistor and a sixth resistor, wherein the first end of the fifth resistor and the first end of the sixth resistor are both connected to a negative ground power supply, and the second end of the fifth resistor and the second end of the sixth resistor are both connected to a processor.

[0014] In one embodiment, the third resistor, the fourth resistor, the fifth resistor and the sixth resistor are varistors.

[0015] In a second aspect, the present application provides an aerosol generating device, comprising a pressure sensor for detecting the inhalation air pressure of the aerosol generating device, wherein the pressure sensor comprises a detection circuit as described in any of the above embodiments.

[0016] In one embodiment, the pressure sensor further comprises a single crystal silicon diaphragm, the sensing circuit of the detection circuit is placed on the outer surface of the single crystal silicon diaphragm, and the side of the single crystal silicon diaphragm facing away from the sensing circuit is arranged corresponding to the air inlet of the aerosol generating device.

[0017] In one embodiment, the pressure sensor further includes an electrostatic protection element, and the electrostatic protection element is connected in series or in parallel with the detection circuit.

[0018] According to the detection circuit of the above embodiment, since at least one resistor in the sensor circuit can respond to the change of the inhaled air pressure of the aerosol generating device to change its own resistance value, and the sensor circuit can output a first voltage signal and a second voltage signal with a potential difference value based on the resistance value of at least one resistor under different air pressures, at the same time, the processor can receive the first voltage signal and the second voltage signal to achieve the purpose of detecting the inhaled air pressure of the aerosol generating device, so as to further improve the anti-interference ability of the detection circuit, thereby enhancing the stability of the detection circuit and further ensuring the accuracy of the monitoring result of the detection circuit, avoiding the problem that the capacitance signal in the capacitive gas sensor is easily affected by the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the structure of a detection circuit provided in an embodiment of the present application.

[0021] Figure 2 A schematic diagram of the structure of a detection circuit provided in another embodiment.

[0022] Figure 3 A schematic diagram of the structure of a pressure sensor provided in an embodiment of the present application.

[0023] Figure 4 This is a schematic diagram of the structure of an aerosol generating device provided in an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 100, detection circuit; 110, sensing circuit; 120, processor; 130, differential operational amplifier; 200, pressure sensor; 210, resistor; 220, single crystal silicon diaphragm; 300, aerosol generating device; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; U1, positive grounded power supply; U2, negative grounded power supply. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0027] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or changed in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0028] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0029] Nowadays, when consumers inhale an aerosol generating device, the gas flow rate and pressure inside the aerosol generating device will change. A gas sensor is usually set in the aerosol generating device to monitor the flow rate and pressure changes of the internal gas, and the aerosol generating device can adaptively change the internal values ​​according to the changes, thereby further improving the user experience. However, the existing gas sensors have poor anti-interference capabilities, resulting in inaccurate monitoring results.

[0030] Based on the above technical problems, the present application provides a detection circuit 100, which can be used to detect the suction pressure of an aerosol generating device. Figure 1 , Figure 1 A schematic diagram of the structure of the detection circuit 100 provided in an embodiment of the present application.

[0031] In this embodiment, if Figure 1As shown, the detection circuit 100 includes a sensor circuit 110 and a processor 120, wherein the sensor circuit 110 includes at least one resistor, and the at least one resistor changes its own resistance value in response to the change of the inhalation pressure of the aerosol generating device, and the sensor circuit 110 can output a first voltage signal and a second voltage signal based on the resistance value of the at least one resistor under different air pressures. At the same time, the processor 120 is electrically connected to the sensor circuit 110, and the processor 120 is used to receive the first voltage signal and the second voltage signal to detect the inhalation pressure of the aerosol generating device.

[0032] It can be understood that in the present embodiment, the sensor circuit 110 can sense and collect the gas flow and gas pressure inside the aerosol generating device and convert them into a resistance difference change signal (that is, the gas flow and gas pressure inside the airway of the aerosol generating device can affect the resistance in the sensor circuit 110 and can change the resistance parameters), and then the sensor circuit 110 can output the first voltage signal and the second voltage signal with a potential difference to the processor 120 according to the resistance difference of the resistance. At the same time, the processor 120 can process the first voltage signal and the second voltage signal to detect the change of gas flow in the airway of the aerosol generating device based on the processing result.

[0033] Compared with the capacitive gas sensor in the prior art, the sensing circuit 110 provided in this embodiment can further improve the anti-interference ability of the detection circuit 100 by changing the capacitance signal into a resistance signal, thereby enhancing the stability of the detection circuit 100 and further ensuring the accuracy of the monitoring result of the detection circuit 100, avoiding the problem that the capacitance signal in the capacitive gas sensor is easily affected by the external environment.

[0034] Furthermore, since there is a potential difference between the first voltage signal and the second voltage signal output by the detection circuit 100, it is more conducive to electrically connecting other intermediate electronic components before electrically connecting to the processor 120, so that the first voltage signal and the second voltage signal transmitted to the processor 120 have stronger anti-interference ability, which is beneficial to ensure the accuracy of the first voltage signal and the second voltage signal during the transmission process, so that the first voltage signal and the second voltage signal processed by the processor 120 can better reflect the air pressure changes inside the aerosol generating device.

[0035] It should be noted that, in this embodiment, the sensor circuit 110 can output a first voltage signal and a second voltage signal having a potential difference through one suction process.

[0036] See also Figure 2 , Figure 2 FIG. 1 is a schematic diagram of a detection circuit 100 provided in another embodiment. Figure 2As shown, the first output end of the sensor circuit 110 is used to output a first voltage signal, and the second output end of the sensor circuit 110 is used to output a second voltage signal. At the same time, the detection circuit 100 can also include a differential operational amplifier 130, wherein the first output end of the sensor circuit 110 is connected to the first input end of the differential operational amplifier 130, the second output end of the sensor circuit 110 is connected to the second input end of the differential operational amplifier 130, and the first output end and the second output end of the differential operational amplifier 130 are both connected to the processor 120.

[0037] It can be understood that in the present embodiment, since the potential difference signal is usually a very weak potential difference, it is easily affected by abnormal fluctuations in the external environment and thus becomes unstable, and is also easily consumed by the impedance of the acquisition circuit, making the ADC (Analog to digital converter) analog acquisition of the processor 120 not accurate enough. Therefore, a differential operational amplifier 130 is added to the detection circuit 100 provided in the present embodiment to amplify the weak potential difference signal to increase the stability and accuracy of signal acquisition.

[0038] In some embodiments, Figure 2 As shown, the detection circuit 100 may also include a first resistor R1 and a second resistor R2, wherein the first end of the first resistor R1 is connected to the first output end of the sensing circuit 110, and the second end of the first resistor R1 is connected to the first output end of the differential operational amplifier 130. At the same time, the first end of the second resistor R2 is connected to the second output end of the sensing circuit 110, and the second end of the second resistor R2 is connected to the second output end of the differential operational amplifier 130, thereby limiting the current flowing through the differential operational amplifier 130 through the first resistor R1 and the second resistor R2 to prevent the differential operational amplifier 130 from being damaged by excessive current.

[0039] In some embodiments, Figure 2 As shown, the sensing circuit 110 may include a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, wherein the first end of the third resistor R3 and the first end of the fourth resistor R4 can be connected to the positive ground power supply U1, the second end of the third resistor R3 and the second end of the fourth resistor R4 are connected to the processor 120, and at the same time, the first end of the fifth resistor R5 and the first end of the sixth resistor R6 can be connected to the negative ground power supply U2, and the second end of the fifth resistor R5 and the second end of the sixth resistor R6 are connected to the processor 120.

[0040] In some embodiments, the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are all varistors, so that the gas flow and pressure inside the airway of the aerosol generating device will change the resistance parameters of the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 after passing through the airway; at the same time, the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are arranged in series to form a current-sharing voltage-dividing bridge circuit (i.e., the detection circuit 100). When the gas flow inside the airway of the aerosol generating device changes the resistance parameters of the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6, the resistance ratio of the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 in the bridge circuit will change, thereby changing the voltage output value of the bridge circuit, so as to achieve the purpose of the sensor circuit 110 outputting the first voltage signal and the second voltage signal with a potential difference to the processor 120.

[0041] This embodiment provides an aerosol generating device 300, see Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of the pressure sensor 200 provided in an embodiment of the present application. Figure 4 The aerosol generating device 300 provided in the embodiment of the present application is a schematic diagram of the structure of the aerosol generating device 300. The aerosol generating device 300 includes a pressure sensor 200 for detecting the suction pressure of the aerosol generating device 300, and the pressure sensor is the detection circuit 100 mentioned in any of the above embodiments.

[0042] Further, such as Figure 3 As shown, the pressure sensor 200 includes a resistor 210 and a single crystal silicon diaphragm 220, wherein the resistor 210 can be placed on the outer surface of the single crystal silicon diaphragm 220, and the side of the single crystal silicon diaphragm 220 facing away from the resistor 210 is arranged corresponding to the air inlet of the aerosol generating device.

[0043] It is understandable that, during the use or storage of the aerosol generating device, the oil inside the aerosol generating device will volatilize and enter the inside of the microphone and the PPS material film along the airway to form condensate. At the same time, since the acid resistance of the PPS film is limited, as the use time and condensate increase, the PPS film will gradually wrinkle for the oil with strong acidity, thereby changing the capacitance difference between the PPS film and the plate inside the microphone of the gas sensor, which makes the microphone of the gas sensor prone to abnormal phenomena such as self-starting and delayed shutdown. Therefore, this embodiment changes the gas sensing material inside the microphone of the sensor (changing PPS to silicon) to enhance the acid resistance and reduce or eliminate the self-starting and delayed shutdown phenomena of the microphone.

[0044] It can be understood that, in this embodiment, the resistor 210 may include a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6 of a varistor type. At the same time, when the aerosol generating device takes in air, the gas can cause the single crystal silicon diaphragm 220 to deform to abut against and affect the resistor, so as to achieve the purpose of changing the resistance value of the resistor.

[0045] Furthermore, the resistor 210 (such as the third pressure-sensitive resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6) can be arranged in the sensor circuit 110, and the resistor 210 responds to the change of the inhalation pressure of the aerosol generating device to change its own resistance value, and the sensor circuit 110 can output the first voltage signal and the second voltage signal based on the resistance value of the resistor 210 under different air pressures. At the same time, the processor 120 is electrically connected to the sensor circuit 110, and the processor 120 is used to receive the first voltage signal and the second voltage signal to detect the inhalation pressure of the aerosol generating device.

[0046] It can be understood that in the present embodiment, the sensing circuit 110 can sense and collect the gas flow and gas pressure inside the aerosol generating device and convert them into a resistance difference change signal (that is, the gas flow and gas pressure inside the airway of the aerosol generating device can affect the resistance in the sensing circuit 110 and can change the resistance parameters), and then the sensing circuit 110 can output a first voltage signal and a second voltage signal with a potential difference to the processor 120 according to the resistance difference of the resistance. At the same time, the processor 120 can detect the changes in the gas flow in the airway of the aerosol generating device through the first voltage signal and the second voltage signal, so as to further improve the anti-interference ability of the detection circuit 100, thereby enhancing the stability of the detection circuit 100 and further ensuring the accuracy of the monitoring results of the detection circuit 100, avoiding the problem that the capacitance signal in the capacitive gas sensor is easily affected by the external environment.

[0047] Furthermore, the pressure sensor 200 may also include an electrostatic protection element, wherein the electrostatic protection element detection circuit is arranged in series or in parallel, so as to achieve the purpose of anti-static and anti-surge, thereby effectively enhancing the protection capability of the detection circuit 100. It is understandable that the electrostatic protection element in this embodiment may be an ESD (Electro-Static Discharge) tube or a TVS (Transient Voltage Suppressor) and other devices.

[0048] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0049] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0050] The detection circuit and aerosol generating device provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A detection circuit, characterized in that: For detecting the inhaled air pressure of an aerosol generating device, the detection circuit comprises: a sensing circuit, the sensing circuit comprising at least one resistor, the at least one resistor changing its resistance value in response to a change in the inhaled air pressure of the aerosol generating device, the sensing circuit outputting a first voltage signal and a second voltage signal having a potential difference value based on the resistance value of the at least one resistor under different air pressures; A processor is electrically connected to the sensor circuit, and the processor is used to receive the first voltage signal and the second voltage signal to detect the inhaled air pressure of the aerosol generating device.

2. The detection circuit according to claim 1, characterized in that: The sensing circuit has a first output terminal and a second output terminal, the first output terminal is used to output a first voltage signal, and the second output terminal is used to output a second voltage signal; The detection circuit further includes a differential operational amplifier, wherein the differential operational amplifier has a first input terminal and a second input terminal; The first output terminal of the sensing circuit is connected to the first input terminal of the differential operational amplifier, and the second output terminal of the sensing circuit is connected to the second input terminal of the differential operational amplifier.

3. The detection circuit according to claim 2, characterized in that: The differential operational amplifier further includes a first output terminal and a second output terminal, and both the first output terminal and the second output terminal of the differential operational amplifier are connected to the processor.

4. The detection circuit according to claim 3, characterized in that: The detection circuit includes a first resistor, a first end of the first resistor is connected to a first output end of the sensor circuit, and a second end of the first resistor is connected to a first output end of the differential operational amplifier.

5. The detection circuit according to claim 3 or 4, characterized in that: The detection circuit further includes a second resistor, a first end of the second resistor is connected to the second output end of the sensing circuit, and a second end of the second resistor is connected to the second output end of the differential operational amplifier.

6. The detection circuit according to claim 1, characterized in that: The sensing circuit includes a third resistor and a fourth resistor, a first end of the third resistor and a first end of the fourth resistor are both connected to a positive grounded power supply, and a second end of the third resistor and a second end of the fourth resistor are both connected to a processor.

7. The detection circuit according to claim 5, characterized in that: The sensing circuit also includes a fifth resistor and a sixth resistor, wherein a first end of the fifth resistor and a first end of the sixth resistor are both connected to a negative ground power supply, and a second end of the fifth resistor and a second end of the sixth resistor are both connected to a processor.

8. An aerosol generating device, characterized in that: A pressure sensor is included for detecting the inhaled air pressure of the aerosol generating device, wherein the pressure sensor comprises a detection circuit according to any one of claims 1 to 7.

9. The aerosol generating device according to claim 8, characterized in that: The pressure sensor also includes a single crystal silicon diaphragm, the sensing circuit of the detection circuit is placed on the outer surface of the single crystal silicon diaphragm, and the side of the single crystal silicon diaphragm away from the sensing circuit is arranged corresponding to the air inlet of the aerosol generating device.

10. The aerosol generating device according to claim 9, characterized in that The pressure sensor further includes an electrostatic protection element, which is connected in series or in parallel with the detection circuit.

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