An airflow sensing device, a PCB circuit board and an atomization device

Abstract

The application discloses an airflow sensing device, a PCB circuit board and an atomization device, wherein the airflow sensing device comprises a shell, an airflow sensing element and an integrated unit, the airflow sensing element and the integrated unit are arranged at two ends of the shell, and the airflow sensing element and the integrated unit form a containing cavity; the integrated unit comprises a circuit board and a multifunctional chip, the multifunctional chip is mounted on the circuit board, the multifunctional chip is provided with at least two kinds of functional circuits, the circuit board is provided with an output pin, and the output pin penetrates through the shell and is used for electrically connecting an external circuit. The application integrates multiple functions in the airflow sensing device, reduces the number of parts and the area of the circuit board in the electronic equipment, makes the product design more compact, and the structure more compact. Meanwhile, the signal transmission distance between circuits is shortened, the interference and loss of signal transmission are reduced, the quality and processing efficiency of the airflow detection signal are improved, and the airflow sensing performance is more stable and reliable.

Description

Technical Field

[0001] This application relates to the field of atomization, specifically to the field of electronic atomization devices, and particularly to an airflow sensing device, a PCB circuit board, and an atomization device. Background Technology

[0002] Electronic atomizing devices consist of two main parts: the atomizer and the vapor chamber. The vapor chamber comprises a PCB board, a rechargeable battery, and various other circuits. In related technologies, electronic atomizing devices with charging capabilities typically have PCB boards containing overvoltage protection (OVP) modules, charging modules, smoke control modules, airflow detection modules, and lithium battery protection modules. However, the integration density of components on these PCB boards is relatively low, making it difficult to meet the miniaturization requirements of electronic atomizing devices. Utility Model Content

[0003] The technical problem to be solved by this application is to address the difficulty of adapting the existing circuit board area to the miniaturization requirements of electronic atomization devices. To this end, an airflow sensing device, a PCB circuit board, and an atomization device are provided. The airflow sensing device integrates multiple circuit functions and is independently mounted on the PCB circuit board, thereby reducing the layout of multiple circuits on the circuit board, reducing the size of the PCB circuit board, and meeting the miniaturization requirements.

[0004] The technical solution adopted by this application to solve its technical problem is: an airflow sensing device, including a housing, an airflow sensing element, and an integrated unit, wherein the airflow sensing element and the integrated unit are respectively disposed at both ends of the housing, and the airflow sensing element and the integrated unit form a receiving cavity; the integrated unit includes a circuit board and a multi-functional chip, the airflow sensing element is electrically connected to the multi-functional chip, the circuit board is mounted on one end of the housing opposite to the airflow sensing element, the multi-functional chip is mounted on the circuit board, and the multi-functional chip is provided with at least two functional circuits, the circuit board is provided with an output pin, the output pin passes through the housing, and is used for electrical connection to an external circuit.

[0005] In one embodiment, the airflow sensing element includes an electrode plate and a diaphragm, with a distance between the electrode plate and the diaphragm. The diaphragm is fixed to the housing, the electrode plate is disposed at one end near the integrated unit, and the electrode plate and the circuit board form the receiving cavity, in which the multifunctional chip is housed.

[0006] In one embodiment, the housing, circuit board, and electrode plate are all provided with vents, and the vents are connected to the receiving cavity.

[0007] In one embodiment, the flow sensing device further includes an oil-proof mesh disposed at one end of the housing near the airflow sensing element and covering the air vent.

[0008] In one embodiment, the multifunctional chip includes at least two functional circuits selected from an airflow detection circuit, a charging circuit, an output power control circuit, an LED drive control circuit, and a protection circuit.

[0009] A PCB circuit board includes a PCB motherboard, an airflow sensing device, a charging circuit, an airflow detection circuit, an output power control circuit, an LED driver control circuit, a protection circuit, a lithium protection circuit, and an OVP circuit. The airflow sensing device is mounted on the PCB motherboard, and at least two functional circuits from the charging circuit, airflow detection circuit, output power control circuit, LED driver control circuit, and protection circuit are integrated on the airflow sensing device. The lithium protection circuit and the OVP circuit are arranged on the PCB motherboard.

[0010] In one embodiment, the airflow sensing device includes a housing, an airflow sensing element, and an integrated unit. The airflow sensing element and the integrated unit are disposed at opposite ends of the housing, forming a receiving cavity. The integrated unit includes a circuit board and a multi-functional chip. The airflow sensing element is electrically connected to the multi-functional chip. The circuit board is mounted on one end of the housing opposite to the airflow sensing element. The multi-functional chip is mounted on the circuit board and includes at least two functional circuits selected from a charging circuit, an airflow detection circuit, an output power control circuit, an LED drive control circuit, and a protection circuit. The circuit board has an output pin that passes through the housing and is used to electrically connect to the PCB motherboard.

[0011] In one embodiment, the PCB motherboard is provided with an interface corresponding to the output pin, and the airflow sensing device is inserted into the PCB motherboard through the output pin and soldered at the interface.

[0012] In one embodiment, the PCB motherboard is provided with a charging interface, and the charging interface is close to the airflow detection device, and the charging interface is electrically connected to the multi-functional chip.

[0013] In one embodiment, the charging interface is located on one side of the PCB motherboard, and the airflow detection element is located on the other side of the PCB motherboard.

[0014] An atomizing device includes a PCB circuit board and an airflow sensing device. The airflow sensing device is mounted on the PCB circuit board and electrically connected to the circuit of the PCB circuit board. The airflow sensing device is used to detect airflow and integrates at least two functional circuits from the following: a charging circuit, an airflow detection circuit, an output power control circuit, an LED drive control circuit, and a protection circuit. The PCB circuit board is laid out with a lithium protection circuit and an OVP circuit.

[0015] In one embodiment, the airflow sensing device includes a housing, an airflow sensing element, and an integrated unit. The housing is mounted on the PCB circuit board. The airflow sensing element and the integrated unit are disposed at opposite ends of the housing and form a receiving cavity. The integrated unit includes a circuit board and a multi-functional chip. The airflow sensing element is electrically connected to the multi-functional chip. The circuit board is mounted at one end of the housing opposite to the airflow sensing element. The multi-functional chip is mounted on the circuit board and integrates a charging circuit, an airflow detection circuit, an output power control circuit, an LED driving control circuit, and a protection circuit. The circuit board has an output pin that passes through the housing and is used to electrically connect to the PCB circuit board.

[0016] In one embodiment, the PCB circuit board is provided with a charging interface, and the charging interface is located on one side of the PCB circuit board, while the airflow detection element is located on the other side of the PCB circuit board.

[0017] Implementing this application has the following beneficial effects:

[0018] 1. The airflow sensing device provided in this application is equipped with a multi-functional chip. On the one hand, it integrates multiple functions into one, reducing the number of components and the area of ​​the circuit board in the electronic device, making the product design more compact, and simplifying the assembly and debugging work in the production process, which helps to improve production efficiency and reduce costs. On the other hand, the integrated design shortens the signal transmission distance between circuits and reduces interference and loss in the signal transmission process, thereby improving the quality and processing efficiency of the airflow detection signal and making the airflow sensing performance more stable and reliable.

[0019] 2. The high integration of some functional circuits on the PCB circuit board into the airflow sensing device reduces discrete components and wiring on the PCB circuit board, thereby reducing the PCB area and simplifying the PCB circuit board structure. Simultaneously, it reduces the risk of failures caused by component damage, poor soldering, short circuits, etc., thus improving the overall reliability and stability of the product and extending its service life.

[0020] 3. Integrating part of the circuitry from the PCB circuit board into the atomizing device in the microphone can improve space utilization, save PCB circuit board space, and allow for a more rational layout of other components such as the battery and atomizer, which helps to achieve product miniaturization and portability. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this application, the following description will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0022] Figure 1 This is a schematic diagram of the junction of an airflow sensing device according to this application;

[0023] Figure 2 yes Figure 1 A cross-sectional schematic diagram;

[0024] Figure 3 This is a schematic diagram of the airflow sensing element of this application;

[0025] Figure 4 This is a schematic diagram of the PCB circuit board structure of this application;

[0026] Figure 5 yes Figure 4 A structural diagram from another perspective;

[0027] Figure 6 This is a schematic diagram of the output pin structure of a multi-functional chip;

[0028] Figure 7 This is a schematic diagram of the structure of an atomizing device according to this application;

[0029] Figure 8 This is a circuit diagram of one type of atomizing device in this application;

[0030] Figure 9 This is a PCB layout diagram of the atomizing device of this application. Detailed Implementation

[0031] To provide a clearer understanding of the technical features, objectives, and effects of this application, the specific embodiments of this application are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this application.

[0032] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0033] This embodiment provides an airflow sensing device. The airflow sensing device in this embodiment has a chip that integrates multiple circuits, which reduces the number of components and wiring complexity, making the structure of the atomizing device more compact and smaller in size, and easier to carry.

[0034] Please see Figures 1-2 , Figure 1 This is a schematic diagram of the structure of an airflow sensing device according to an embodiment of this application. Figure 2 yes Figure 1 A cross-sectional schematic diagram of the airflow sensing device in the illustrated embodiment.

[0035] This application provides an airflow sensing device 100 for use in an atomizing device. It includes a housing 10, an airflow sensing element 20, and an integrated unit 30. The airflow sensing element 20 and the integrated unit 30 are respectively disposed at both ends of the housing 10, forming a receiving cavity 11. The integrated unit 30 includes a circuit board 31 and a multi-functional chip 32. The airflow sensing element 20 is electrically connected to the multi-functional chip 32. The circuit board 31 is mounted on one end of the housing 10 opposite to the airflow sensing element 20. The multi-functional chip 32 is mounted on the circuit board 31 and is provided with at least two functional circuits. The circuit board 31 is provided with an output pin 33, which passes through the housing 10 and is used to electrically connect to an external circuit.

[0036] In this embodiment, the airflow sensing device 100 integrates multiple functions through the multi-functional chip 32, overcoming the limitation of the single airflow detection function of the airflow sensing element 20 and realizing a combination of multiple functions. At the same time, integrating multiple functions into one unit reduces the number of components and the space occupied by the device, which is conducive to the miniaturization design of electronic products, improves the user experience, and the high degree of integration can reduce the probability of device failure and improve the overall reliability and stability of the device.

[0037] In this embodiment, the circuit board 31 is mounted on the housing 10 of the airflow sensing device 100, and the multi-functional chip 32 is soldered onto the circuit board 31. The multi-functional chip 32 integrates at least two functional circuits through circuit topology and logic architecture. On the one hand, integrating multiple functions into one reduces the number of components and the area of ​​the circuit board in the electronic device, making the product design more compact and simplifying the assembly and debugging work in the production process, which helps to improve production efficiency and reduce costs. On the other hand, the integrated design shortens the signal transmission distance between circuits and reduces interference and loss in the signal transmission process, thereby improving the quality and processing efficiency of the airflow detection signal and making the airflow sensing performance more stable and reliable.

[0038] In one embodiment, the multi-functional chip 32 can integrate two or more functional circuits from a variety of functional circuits, such as airflow detection circuit, charging circuit, output power control circuit, LED drive control circuit and protection circuit. The circuits of these functional modules are printed with the corresponding circuits and / or components, such as charging chips or charging control circuits, to implement the corresponding functional modules according to the application scenario.

[0039] In one embodiment, the multi-functional chip 32 integrates airflow detection and airflow control module circuits. Through hardware and software co-optimization, it can achieve integrated closed-loop management of detection and control. Traditional solutions require independent detection circuits, control chips, and peripheral airflow sensing elements 20. In this embodiment, the integrated airflow sensing device 100 completes the entire "detection-judgment-control" process, simplifying the device structure and space, and reducing hardware design difficulty. Specifically, the airflow sensing element 20 detects airflow changes and converts them into corresponding electrical signals through the airflow detection module to achieve the detection function. The airflow control module and the airflow detection module can interact with each other. The airflow control module can accurately regulate the airflow based on the electrical signals fed back by the airflow detection module. For example, in an atomizing device, the airflow sensing element 20 senses the suction airflow and outputs a corresponding voltage signal through the airflow detection module. Through interaction, the airflow control module can adjust the heating power or control the airflow intake based on the duration of the detection signal.

[0040] In one embodiment, such as Figure 3As shown, the airflow sensing element 20 includes an electrode plate 21 and a diaphragm 23, with a distance between the electrode plate 21 and the diaphragm 23. The diaphragm 23 is fixed to the housing 10. The electrode plate 21 is located at one end near the integrated unit 30, and the electrode plate 21 and the circuit board 31 form a receiving cavity 11. The multifunctional chip 32 is housed in the receiving cavity 11.

[0041] One side A of the airflow sensing element 20 is connected to atmospheric pressure, and the other side B has a sensing hole. When a negative pressure is formed on side B due to suction, the diaphragm 23 / plate 21 inside the airflow sensing element 20 will deform, thereby changing the capacitance of the parallel plate capacitor (capacitive microphone) or the resistance of the diaphragm 23 / plate 21 (piezoresistive microphone), thus detecting the suction signal.

[0042] In one embodiment, the airflow sensing element 20 is a capacitive electret microphone, and may also include a spacer 22. The spacer 22 separates the electrode plate 21 and the diaphragm 23, such that there is a distance d between the electrode plate 21 and the diaphragm 23, forming a planar capacitor structure. Furthermore, the diaphragm 23 is fixed to the housing 10, the electrode plate 21 is disposed at one end near the integrated unit 30, and the electrode plate 21 and the circuit board 31 form a receiving cavity 11. The multifunctional chip 32 is housed in the receiving cavity 11. The multifunctional chip 32 is disposed at one end of the circuit board 31 near the receiving cavity 11. The multifunctional chip 32 is housed in the receiving cavity 11, which further improves the space utilization of the airflow sensing device 100 and simplifies the device structure and size.

[0043] like Figure 2 As shown, the housing 10 has vents 101 at both ends, the circuit board 31, and the electrode plate 21, and all vents 101 are connected to the receiving cavity 11.

[0044] A receiving cavity 11 is formed between the circuit board 31 and the electrode plate 21. Both ends of the housing 10 and the air holes 101 of the circuit board 31 are connected to the receiving cavity 11. The air holes 101 of the circuit board 31 are connected to the atmosphere. The air hole 101 at one end of the housing 10 opposite to the circuit board 31 is a sensing hole. When suction is performed, the diaphragm 23 deforms due to the negative pressure, resulting in a change in capacitance and generating an electrical signal.

[0045] In one embodiment, the volume and shape of the receiving cavity 11 affect the efficiency of the deformation of the diaphragm 23. Specifically, the distance between the circuit board 31 and the electrode 21 is much greater than the distance between the electrode 21 and the diaphragm 23, that is, the height of the receiving cavity 11 is greater than the distance between the electrode 21 and the diaphragm 23. If the height of the receiving cavity 11 is too small, the negative pressure caused by suction may cause excessive pressure on the diaphragm 23, resulting in a large instantaneous deformation of the diaphragm 23 and causing damage, or causing the amplitude to exceed the linear range, resulting in clipping and distortion of the output electrical signal, leading to signal distortion. On the other hand, if the height is too large, that is, the space of the receiving cavity 11 is too large, the driving force on the diaphragm 23 is weak, which may not be able to make the diaphragm 23 vibrate sufficiently.

[0046] In one embodiment, the airflow sensing device 100 further includes an oil-proof mesh 40, which is disposed at one end of the housing 10 near the airflow sensing element and covers the air vent 101.

[0047] The oil-proof mesh 40 has a high porosity, which ensures gas permeability and avoids airflow detection delay due to mesh blockage. The oil-proof mesh 40 is also used to prevent oily substances from entering the airflow sensing device 100, avoiding component corrosion, such as the circuit board 31 and the multi-functional chip 32, which could lead to performance failure.

[0048] In one embodiment, the oil-proof mesh 40 is disposed at one end of the housing 10 near the diaphragm 23. If oily substances adhere to the surface of the diaphragm, it can reduce its elasticity, decrease the vibration amplitude, and weaken or even eliminate the electrical signal output. The oil-proof mesh 40 is used to protect oily substances from adhering to the diaphragm 23.

[0049] This embodiment also provides a PCB circuit board 200, such as Figure 4 and Figure 5 As shown, the system includes a PCB motherboard 50, an airflow sensing device 100, a charging circuit, an airflow detection circuit, an output power control circuit, an LED driver control circuit, a protection circuit, a lithium protection circuit, and an OVP circuit. The airflow sensing device 100 is mounted on the PCB motherboard 50. At least two functional circuits from the charging circuit, airflow detection circuit, output power control circuit, LED driver control circuit, and protection circuit are integrated on the airflow sensing device 100. The lithium protection circuit and the OVP circuit are located on the PCB motherboard 50.

[0050] The PCB motherboard 50 also includes a charging interface 51, a lithium battery protection chip 52, and an OVP (Over Voltage Protection) chip. The charging interface 51 is used to connect to an external power source. The lithium battery protection chip 52 has a lithium protection circuit to protect the battery cell from damage caused by overcharging, over-discharging, overcurrent, short circuits, etc., thus extending battery life and ensuring safe use. The OVP chip 53 has an OVP circuit to prevent damage to the circuit due to excessive input voltage.

[0051] In this embodiment, some functional circuits of the PCB circuit board 200 are highly integrated into the airflow sensing device 100, which reduces discrete components and wiring on the PCB circuit board 200, reduces the area of ​​the PCB circuit board 200, and simplifies the structure of the PCB circuit board 200. At the same time, it reduces the risk of failure caused by component damage, poor soldering, short circuits, etc., thereby improving the reliability and stability of the entire product and extending the product's service life.

[0052] In one embodiment, the airflow sensing device 100 includes a housing 10, an airflow sensing element 20, and an integrated unit 30. The airflow sensing element 20 and the integrated unit 30 are respectively disposed at both ends of the housing 10, and the airflow sensing element 20 and the integrated unit 30 form a receiving cavity 11. The integrated unit 30 includes a circuit board 31 and a multi-functional chip 32. The airflow sensing element 20 is electrically connected to the multi-functional chip 32. The circuit board 31 is mounted on one end of the housing 10 opposite to the airflow sensing element 20. The multi-functional chip 32 is mounted on the circuit board 31, and the multi-functional chip 32 is provided with at least two functional circuits among a charging circuit, an airflow detection circuit, an output power control circuit, an LED driving control circuit, and a protection circuit. The circuit board 31 is provided with an output pin 33, which passes through the housing 10 and is used to electrically connect to the PCB motherboard 50.

[0053] In one embodiment, the airflow sensing device 100 is mounted on a PCB motherboard 50. The airflow sensing device 100 includes a housing 10, an airflow sensing element 20, and an integrated unit 30. The integrated unit 30 includes a circuit board 31 and a multi-functional chip 32. The multi-functional chip 32 is mounted on the circuit board 31 and integrates a charging circuit, an airflow detection circuit, an output power control circuit, an LED driver control circuit, and a protection circuit. The circuit board 31 has an output pin 33 that extends out of the housing 10 and is fixed to the PCB board by soldering, thus connecting the circuitry of the PCB motherboard 50 to the circuitry of the airflow sensing device 100. The charging circuit has a linear charging management function, supports a complete battery charging cycle, and can manage the charging current and charging voltage. The LED driver control circuit supports the control of at least one LED, including various modes such as gradual brightening, gradual dimming, flashing, and constant light, to suit different display functions under different conditions.

[0054] In one embodiment, the multi-functional chip 32 is a highly integrated dedicated chip that has strong resistance to common system interferences. It has advantages such as small size, minimal need for external components, and can greatly simplify system design and reduce system cost.

[0055] In one embodiment, the PCB motherboard 50 is provided with an interface corresponding to the output pin 33, and the airflow sensing device 100 is inserted into the PCB motherboard 50 through the output pin 33 and soldered at the interface.

[0056] like Figure 6 As shown, the airflow sensing device 100 has five output pins 33, including a GND pin, a VDD pin, a charge pin, an OUT pin, and an LED pin. The GND pin is used for grounding and is connected to the negative terminal of the battery when connected to the circuit. The VDD pin is used to connect to the power supply and is connected to the positive terminal of the battery when connected to the circuit. The charge pin is used to connect the charging interface 51 and the charging protection module within the multi-function chip 32. The LED pin is used to connect external LED components and the LED driver control circuit within the multi-function chip 32. The OUT pin is a signal connection terminal, connected to the airflow detection module circuit of the circuit board 31.

[0057] In one embodiment, the charging interface 51 is located on one side of the PCB motherboard 50, and the airflow sensing element 20 is located on the other side of the PCB motherboard 50, further optimizing the space of the PCB circuit board 200 and reducing the size of the PCB circuit board 200.

[0058] like Figure 7 As shown in the illustration, this application also provides an atomizing device, including a mouthpiece 71, a cartridge 72, an atomizing structure 73, and a battery rod 74. The cartridge 72 contains atomizing liquid, and the atomizing structure 73 is equipped with a heating wire that heats and atomizes the atomizing liquid. The battery rod 74 contains an airflow path, a battery 75, a PCB circuit board 200, and an airflow sensing device 100. The airflow path connects the atomizing structure and the airflow sensing device 100. The airflow sensing device 100 is mounted on the PCB circuit board 200 and electrically connected to the circuitry of the PCB circuit board 200. The airflow sensing device 100 is used to detect airflow and integrates at least two functional circuits from the following: a charging circuit, an airflow detection circuit, an output power control circuit, an LED drive control circuit, and a protection circuit. The PCB circuit board 200 also has a lithium protection circuit and an OVP circuit.

[0059] In one embodiment, the lithium battery protection circuit is located at one end of the PCB circuit board 200 via the lithium battery protection chip 52, and the OVP circuit is located at the other end of the PCB circuit board 200 via the OVP chip 53. In this embodiment, the multi-functional chip 32 in the airflow sensing device 100 is the main control chip of the atomizing device, providing a high-performance chip solution for electronic atomizing products that integrates battery charging, discharging control, microphone detection, and LED driving.

[0060] In this embodiment, the airflow sensing device 100 includes a housing 10, an airflow sensing element 20, and an integrated unit 30. The housing 10 is mounted on the PCB circuit board 200. The airflow sensing element 20 and the integrated unit 30 are respectively disposed at both ends of the housing 10 and form a receiving cavity 11 for providing airflow space. The integrated unit 30 includes a circuit board 31 and a multi-functional chip 32. The airflow sensing element 20 is electrically connected to the multi-functional chip 32. The circuit board 31 is mounted at one end of the housing 10 opposite to the airflow sensing element 20. The multi-functional chip 32 is mounted on the circuit board 31 and integrates a charging circuit, an airflow detection circuit, an output power control circuit, an LED driving control circuit, and a protection circuit. The circuit board 31 is provided with an output pin 33, which passes through the housing 10 and is used to electrically connect to the PCB circuit board 200.

[0061] Furthermore, the PCB circuit board 200 is provided with a charging interface 51, and the charging interface 51 is located at one end of the OVP chip 53 or one end of the lithium battery protection chip 52 of the PCB circuit board 200, and the airflow detection element is located on the other side of the PCB circuit board 200.

[0062] Figure 8 This is a circuit diagram of an atomizing device according to this embodiment. Figure 9 This is the PCB circuit layout diagram for this embodiment. In this embodiment, the airflow sensing device 100 is a microphone, and the multi-functional chip 32 is integrated into the microphone. Figure 8 As shown, the microphone has an airflow detection circuit for detecting airflow; a charging circuit for linearly charging the battery; an output power control circuit for controlling the output power of the heating wire; and an LED driver control circuit for driving and controlling the LED display status.

[0063] Furthermore, such as Figure 9As shown, the multi-functional chip 32 is an ASIC chip with 6 pins: SNS, GND, BAT, VBUS, AT, and LED. The SNS pin is the sensor detection pin, which detects changes in the sensing capacitance parameter; the GND pin is the ground pin, connected to the negative terminal of the battery; the BAT pin is the power supply pin, connected to the positive terminal of the battery; the LED pin is the LED status output tube, which reflects the sensor's sensing status in different modes when the battery power is high; the AT pin is the output pin, connected to the load heating wire; and the VBUS pin is the charging input tube.

[0064] Furthermore, such as Figure 8 As shown, the airflow detection circuit is connected to the microphone via the SNS pin, the charging circuit is connected to the USB charging interface 51 via the VBUS pin, and connected to the positive terminal of the battery via the BAT pin. An external LED is connected to the LED pin.

[0065] In this embodiment, the airflow detection circuit detects smoking based on changes in the sensing capacitance parameter. When the system is in standby mode, the airflow detection circuit monitors the sensor status in real time. The airflow detection circuit has a built-in smoking detection circuit. When the sensor status changes in response to a change in air pressure, a preset smoking detection program is triggered. If the smoking conditions are met, it is determined that a smoking action has occurred. Due to environmental changes, the sensor capacitance may change in standby mode even when there is no smoking. The airflow detection circuit has a built-in sensor baseline self-adjustment function. When the capacitance change is not caused by smoking, the baseline capacitance is automatically adjusted to adapt to the smoking sensitivity being unaffected by environmental changes.

[0066] In this embodiment, the charging circuit supports a complete lithium battery charging cycle, effectively extending battery life. The charging circuit also supports constant temperature protection and various charging modes with different current and voltage settings.

[0067] Furthermore, the charging circuit can monitor the battery status and manage charging in three phases: a trickle charge phase for restoring a fully discharged battery, a constant current charge phase for fast charging, and a constant voltage charge phase for charging the battery before it is fully charged to prevent overcharging.

[0068] Specifically, when the lithium-ion battery voltage drops below 2.7V, the battery is considered fully discharged and enters the trickle charging stage. The trickle charging current is 10% of the constant current stage current. After the battery reaches 2.8V, it enters the constant current charging stage. Once the battery is nearly fully charged, the voltage loop controls the charging voltage to remain at the full charge voltage until the current gradually drops to a termination threshold, which is 10% of the constant current charging current. The point at which full charge stops is called EOC (End of Charge). In this state, the charging circuit stops charging the battery, and even if the battery voltage drops, it remains off-charge as long as it does not fall below the recharge voltage drop. When the battery discharges below the recharge voltage drop, the device will automatically restart charging as long as the input voltage (VBUS) remains within the valid range.

[0069] The charging circuit also supports simultaneous charging and discharging, continuously detecting smoking while charging. However, for safety reasons, if smoking is detected during charging, the device will temporarily stop charging and resume charging only after smoking is completed.

[0070] In this embodiment, the protection circuit is used to protect the heating wire or other hardware components, including a UVLO circuit, an over-temperature protection circuit, an over-current protection circuit, a short-circuit protection circuit, an over-inhalation protection circuit, and an overload protection circuit. The UVLO circuit provides different undervoltage protection points to ensure the smoking experience in different applications. The over-temperature protection circuit, over-current protection circuit, and short-circuit protection circuit automatically cut off the output in case of abnormal conditions such as overcurrent, short circuit, or over-temperature of the heating wire or other hardware components to avoid safety issues. The over-inhalation protection circuit cuts off the output and sounds an alarm when the smoking duration is significantly longer than normal. The overload protection circuit automatically stops the output when the heating wire output is short-circuited or the multi-function chip 32 overheats.

[0071] Furthermore, the lithium battery protection chip 52 and the OVP chip 53 are respectively located at both ends of the PCB circuit board 200 to reduce their arrangement area and reduce the size of the PCB circuit board 200.

[0072] Furthermore, the output power control circuit features a 60mQ (typical) low-impedance power transistor, supporting loads as low as 0.9Ω heating wire (depending on microphone cooling and output voltage). In smoking mode, the battery voltage is automatically detected, and the output is chopped at a frequency of 65Hz using PWM (Pulse Width Modulation), with the duty cycle determining the output voltage. The output power control circuit also supports average voltage and constant effective voltage, with selectable voltage values. It's important to note that regardless of whether it's constant voltage or constant effective output, when the peak voltage is lower than the preset output voltage, the duty cycle is locked at 100%. In this case, the output power will decrease significantly as the input voltage decreases.

[0073] It is understood that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that, for those skilled in the art, without departing from the concept of this application, the above technical features can be freely combined, and several modifications and improvements can be made, all of which fall within the protection scope of this application. Therefore, all equivalent transformations and modifications made within the scope of the claims of this application should fall within the coverage of the claims of this application.

Claims

1. An airflow sensing device, characterized in that, The device includes a housing, an airflow sensing element, and an integrated unit. The airflow sensing element and the integrated unit are located at opposite ends of the housing, forming a receiving cavity. The integrated unit includes a circuit board and a multi-functional chip. The airflow sensing element is electrically connected to the multi-functional chip. The circuit board is mounted on one end of the housing opposite to the airflow sensing element. The multi-functional chip is mounted on the circuit board and has at least two functional circuits. The circuit board has output pins that pass through the housing for electrical connection to external circuits.

2. The airflow sensing device according to claim 1, characterized in that, The airflow sensing element includes an electrode plate and a diaphragm, with a distance between the electrode plate and the diaphragm. The diaphragm is fixed to the housing. The electrode plate is located at one end near the integrated unit, and the electrode plate and the circuit board form the receiving cavity. The multifunctional chip is housed in the receiving cavity.

3. The airflow sensing device according to claim 2, characterized in that, The housing, circuit board, and electrode plate are all provided with air holes, which are connected to the receiving cavity.

4. The airflow sensing device according to claim 3, characterized in that, The flow sensing device also includes an oil-proof mesh, which is located at one end of the housing near the airflow sensing unit and covers the air vents.

5. The airflow sensing device according to claim 1, characterized in that, The multifunctional chip includes at least two functional circuits from the following: airflow detection circuit, charging circuit, output power control circuit, LED driver control circuit, and protection circuit.

6. A PCB circuit board, characterized in that, The device includes a PCB motherboard, an airflow sensing device, a charging circuit, an airflow detection circuit, an output power control circuit, an LED driver control circuit, a protection circuit, a lithium protection circuit, and an OVP circuit. The airflow sensing device is mounted on the PCB motherboard. At least two functional circuits from the charging circuit, airflow detection circuit, output power control circuit, LED driver control circuit, and protection circuit are integrated on the airflow sensing device. The lithium protection circuit and OVP circuit are located on the PCB motherboard.

7. The PCB circuit board according to claim 6, characterized in that, The airflow sensing device includes a housing, an airflow sensing element, and an integrated unit. The airflow sensing element and the integrated unit are respectively disposed at both ends of the housing, forming a receiving cavity. The integrated unit includes a circuit board and a multi-functional chip. The airflow sensing element is electrically connected to the multi-functional chip. The circuit board is mounted on one end of the housing opposite to the airflow sensing element. The multi-functional chip is mounted on the circuit board and is provided with at least two functional circuits among a charging circuit, an airflow detection circuit, an output power control circuit, an LED drive control circuit, and a protection circuit. The circuit board has an output pin that passes through the housing and is used to electrically connect to the PCB motherboard.

8. The PCB circuit board according to claim 7, characterized in that, The PCB motherboard is provided with an interface corresponding to the output pin. The airflow sensing device is inserted into the PCB motherboard through the output pin and soldered at the interface.

9. The PCB circuit board according to claim 7, characterized in that, The PCB motherboard is equipped with a charging interface, which is located near the airflow detection device and is electrically connected to the multi-functional chip.

10. The PCB circuit board according to claim 9, characterized in that, The charging interface is located on one side of the PCB motherboard, and the airflow detection element is located on the other side of the PCB motherboard.

11. An atomizing device, characterized in that, The device includes a PCB circuit board and an airflow sensing device. The airflow sensing device is mounted on the PCB circuit board and electrically connected to the circuit of the PCB circuit board. The airflow sensing device is used to detect airflow and integrates at least two functional circuits from the following: a charging circuit, an airflow detection circuit, an output power control circuit, an LED drive control circuit, and a protection circuit. The PCB circuit board is laid out with a lithium protection circuit and an OVP circuit.

12. The atomizing device according to claim 11, characterized in that, The airflow sensing device includes a housing, an airflow sensing element, and an integrated unit. The housing is mounted on the PCB circuit board. The airflow sensing element and the integrated unit are located at opposite ends of the housing and form a receiving cavity. The integrated unit includes a circuit board and a multi-functional chip. The airflow sensing element is electrically connected to the multi-functional chip. The circuit board is mounted at one end of the housing opposite to the airflow sensing element. The multi-functional chip is mounted on the circuit board and integrates a charging circuit, an airflow detection circuit, an output power control circuit, an LED driving control circuit, and a protection circuit. The circuit board has an output pin that passes through the housing and is used to electrically connect to the PCB circuit board.

13. The atomizing device according to claim 11, characterized in that, The PCB circuit board is provided with a charging interface, which is located on one side of the PCB circuit board, and the airflow detection element is located on the other side of the PCB circuit board.

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