Airflow detection chip, circuit, assembly, electronic atomization device and control method

Abstract

The invention provides an airflow detection circuit. The airflow detection circuit comprises a system power supply end and a system grounding end, the voltage input end is used for receiving the output voltage of the resistance bridge; a resistor power supply end; the power supply control unit is used for controlling whether the power supply supplies power to the resistance bridge; the suction detection control module is used for judging the state of the resistance bridge according to the voltage received by the voltage input end; wherein the suction detection control module is further connected with the power supply control unit, and when the suction detection control module judges that the resistance bridge is in a non-suction state, the suction detection control module sequentially outputs pulse signals with multiple frequencies to the power supply control unit to control the power supply control unit to be intermittently conducted, so that the power supply intermittently supplies power to the resistance bridge; and the frequency of the continuous pulse signal in the non-suction state is gradually reduced, so that the power supply time of the power supply to the resistance bridge in unit time is gradually shortened. The embodiment of the invention further provides an airflow detection chip, an airflow detection assembly, an electronic atomization device and a control method.

Description

Technical Field

[0001] The present application relates to the technical field of airflow detection, and in particular to an airflow detection chip, circuit, component, electronic atomization device and control method. Background Art

[0002] With the development of heating atomization technology, electronic atomization devices that use electricity to heat atomization have emerged. Electricity is used to heat the atomized liquid. The electronic atomization device is used to heat the liquid and atomize it into an aerosol for the user to inhale. The electronic atomization device may be a medical electronic atomization device, a common electronic atomization device, etc., and the liquid may be, for example, liquid medicine, e-liquid, etc.

[0003] An existing electronic atomization device triggers the power supply to be turned on by pressing a mechanical switch, thereby heating the atomized liquid for the user to inhale. This method has a low cost, but since it requires the user to perform additional manual operations, it does not conform to the user's usage habits and brings inconvenience to the user.

[0004] Another existing electronic atomization device uses a capacitor microphone to trigger the power supply. The specific principle is to use two diaphragms to form a capacitor, one of which changes with the airflow, and the other does not move. When inhaling, the air inside the electronic atomization device forms a negative pressure, which causes the distance between the two diaphragms to change, resulting in a change in the capacitance value. The detection circuit of the electronic atomization device controls whether to atomize the liquid by detecting the change in capacitance value. This type of electronic atomization device conforms to the user's usage habits, but the structural design is complex and the material cost is high. In addition, when the liquid leaks after the electronic atomization device has been used for a long time, the liquid contaminates the variable membrane, affecting the change in capacitance value, and is prone to false triggering and causing dangerous accidents.

[0005] The applicant's prior Chinese application number CN202311127344.4 applied for an airflow detection circuit, which is used in conjunction with a resistance bridge to replace the capacitor microphone solution. This solution is not easy to be triggered by mistake, and even if the resistance bridge is contaminated, the impact is small. The prior application design continuously supplies power to the resistance bridge when the resistance bridge is in the suction state, and intermittently supplies power to the resistance bridge when it is not in the suction state. This design can reduce power consumption to a certain extent, but the power consumption is still high, resulting in a short standby time, and there is still room for improvement. Summary of the invention

[0006] The technical problem to be solved by the embodiments of the present application is to provide an airflow detection chip, circuit, component, electronic atomization device and control method to address the deficiencies of the prior art, which can further reduce the power consumption of airflow detection and greatly improve the standby time.

[0007] In order to solve the above technical problems, the first aspect of the embodiment of the present application provides an airflow detection circuit, which is used to be connected to a resistance bridge, including:

[0008] System power supply terminal and system ground terminal, which are used to connect to the positive terminal and negative terminal of the power supply respectively;

[0009] A voltage input terminal, which is used to receive the output voltage of the resistance bridge;

[0010] A resistor power supply terminal, which is used to connect to a resistor bridge;

[0011] A power supply control unit, which is connected to the system power supply terminal and / or the system ground terminal, and is also connected to the resistor power supply terminal, and is used to control whether the power supply supplies power to the resistor bridge;

[0012] a suction detection control module connected to the voltage input terminal and used to determine the state of the resistance bridge according to the voltage received by the voltage input terminal;

[0013] Among them, the puff detection control module is also connected to the power supply control unit. When the puff detection control module determines that the resistance bridge is in a non-puff state, the puff detection control module sequentially outputs pulse signals of multiple frequencies to the power supply control unit to control the power supply control unit to be intermittently turned on, so that the power supply intermittently supplies power to the resistance bridge, and as the non-puff state continues, the frequency of the pulse signal gradually decreases, so that the power supply time of the power supply to the resistance bridge per unit time is gradually shortened.

[0014] Optionally, the puff detection control module includes a timing unit. When the puff detection control module determines that the resistance bridge enters a non-puff state from a puff state, the timing unit starts timing, and the puff detection control module outputs a pulse signal of a second frequency to the power supply control unit to control its intermittent conduction, so that the power supply intermittently supplies power to the resistance bridge. When the timing unit times to a first timing threshold, the puff detection control module outputs a pulse signal of a third frequency to the power supply control unit to control its intermittent conduction, and the third frequency is less than the second frequency. When the power supply control unit receives the pulse signal of the third frequency, the duration of its conduction per unit time is shorter than the duration of its conduction per unit time when the power supply control unit receives the pulse signal of the second frequency.

[0015] Optionally, the puff detection control module also includes a puff detection unit and a pulse signal generating unit, wherein the puff detection unit is used to receive the output voltage of the resistance bridge, and the puff detection unit outputs a puff signal or a no-puff signal according to the received voltage, and the timing unit is respectively connected to the puff detection unit and the pulse signal generating unit, and the pulse signal generating unit is connected to the power supply control unit, when the signal received by the timing unit changes from a puff signal to a no-puff signal, the timing unit starts timing, and the pulse signal generating unit generates a pulse signal of a second frequency and outputs it to the power supply control unit, and when the timing unit times to a first timing threshold, the pulse signal generating unit generates a pulse signal of a third frequency and outputs it to the power supply control unit.

[0016] Optionally, the puff detection control module also includes a logic gate unit, two input ends of the logic gate unit are correspondingly connected to the timing unit and the puff detection unit, the output end of the logic gate unit is connected to the pulse signal generating unit, when the signal output by the puff detection unit changes from a puff signal to a no-puff signal, the logic gate unit outputs a first intermediate signal to the pulse signal generating unit, and the pulse signal generating unit generates a pulse signal of a second frequency, when the timing unit times to a first timing threshold, the logic gate unit outputs a second intermediate signal to the pulse signal generating unit, and the pulse signal generating unit generates a pulse signal of a third frequency; or,

[0017] When the signal received by the timing generating unit changes from a suction signal to a non-suction signal, the timing unit outputs a first intermediate signal to the pulse signal generating unit, and the pulse signal generating unit generates a pulse signal of a second frequency. When the timing unit times to a first timing threshold, the timing unit outputs a second intermediate signal to the pulse signal generating unit, and the pulse signal generating unit generates a pulse signal of a third frequency.

[0018] Optionally, the pulse signal generating unit includes a first pulse generating subunit, a second pulse generating subunit and a selecting subunit, and the puff detection control module also includes a logic gate unit, wherein the first pulse generating subunit is used to generate a pulse signal of a second frequency, and the second pulse generating subunit is used to generate a pulse signal of a third frequency, and the selecting subunit is connected to the first pulse generating subunit and the second pulse generating subunit respectively, and the selecting subunit is also connected to the power supply control unit, the selecting end of the selecting subunit is connected to the logic gate unit, and the two input ends of the logic gate unit are correspondingly connected to the timing unit and the puff detection unit, when the signal output by the puff detection unit changes from a puff signal to a non-puff signal, the logic gate unit outputs a first intermediate signal to the selecting subunit, and the selecting subunit selects the pulse signal of the second frequency to output, and when the timing unit times to a first timing threshold, the logic gate unit outputs a second intermediate signal to the selecting subunit, and the selecting subunit selects the pulse signal of the third frequency to output; or,

[0019] The pulse signal generating unit includes a first pulse generating subunit, a second pulse generating subunit and a selecting subunit, and the logic pulse control unit also includes a logic gate unit, wherein the first pulse generating subunit is used to generate a pulse signal of a second frequency, and the second pulse generating subunit is used to generate a pulse signal of a third frequency, and the selecting subunit is connected to the first pulse generating subunit and the second pulse generating subunit respectively, and the selecting subunit is also connected to the power supply control unit, and the selecting end of the selecting subunit is connected to the timing unit, when the signal received by the timing generating unit changes from a suction signal to a non-suction signal, the timing unit outputs a first intermediate signal to the selecting subunit, and the selecting subunit selects the pulse signal of the second frequency to output, and when the timing unit times to a first timing threshold, the timing unit outputs a second intermediate signal to the selecting subunit, and the selecting subunit selects the pulse signal of the third frequency to output.

[0020] Optionally, the puff detection unit includes a differential amplifier unit, a voltage comparison subunit and a reference voltage generating subunit, wherein the differential amplifier unit is used to receive the output voltage of the resistance bridge, the output end of the differential amplifier unit is connected to an input end of the voltage comparison subunit, the other input end of the voltage comparison subunit is connected to the reference voltage generating subunit, the reference voltage generating subunit is used to generate a second reference voltage, and the voltage comparison subunit compares the voltages of the two input ends to output a puff signal or a no-puff signal.

[0021] Optionally, the puff detection control module includes a puff detection unit and a logic pulse control unit, the puff detection unit is used to receive the output voltage of the resistance bridge, the puff detection unit outputs a puff signal or a no-puff signal according to the received voltage, the logic pulse control unit is connected to the puff detection unit, when the puff detection unit determines that the resistance bridge is in a no-puff state, the logic pulse control unit sequentially outputs pulse signals of multiple frequencies to the puff detection unit to control at least some sub-units of the puff detection unit to work intermittently, and as the no-puff state continues, the frequency of the pulse signal gradually decreases to shorten the working time of at least some of the sub-units per unit time.

[0022] Optionally, in a non-puffing state, at least some subunits of the puff detection unit intermittently work in synchronization with the intermittent conduction of the power supply control unit.

[0023] Optionally, the power supply control unit includes a first switch, one end of the first switch is connected to a system power supply end or a system ground end, the other end of the first switch is connected to a resistor power supply end, and a control end of the first switch is connected to a suction detection control module for receiving the pulse signal; or

[0024] The power supply control unit includes a constant current source and a first switch, one end of the first switch is connected to the system power supply end or the system ground end, the other end of the first switch is connected to the resistor power supply end, the control end of the first switch is connected to the suction detection control module to receive the pulse signal, and the constant current source is connected in series with the first switch; or

[0025] The power supply control unit includes a step-down voltage regulator unit, which is a low-voltage dropout linear regulator. The low-voltage dropout linear regulator includes an operational amplifier, a first sampling resistor, a second sampling resistor, and an adjustment tube, wherein the input end of the adjustment tube is used to be electrically connected to the positive end of the power supply, the output end of the adjustment tube is connected to the resistance bridge, the control end of the adjustment tube is electrically connected to the output end of the operational amplifier, the first end of the operational amplifier is connected to a first reference voltage, the second end of the operational amplifier is electrically connected to the first end of the second sampling resistor, the first end of the first sampling resistor is electrically connected to the output end of the adjustment tube, the second end of the first sampling resistor is electrically connected to the first end of the second sampling resistor, the second end of the second sampling resistor is electrically connected to the system ground end, and the enable end of the operational amplifier receives the pulse signal.

[0026] A second aspect of an embodiment of the present application provides an airflow detection component, comprising:

[0027] a resistance bridge configured such that the flow of airflow causes a change in resistance, and when the resistance bridge is powered, the resistance bridge is configured to cause a change in output voltage based on the change in resistance;

[0028] The above-mentioned airflow detection circuit is connected to the resistance bridge.

[0029] A third aspect of the present application provides an electronic atomization device, comprising:

[0030] Power supply and heating elements;

[0031] The above-mentioned airflow detection component or the above-mentioned airflow detection circuit, the airflow detection circuit also includes a power switch, the control end of the power switch is connected to the suction detection control module of the airflow detection circuit, one end of the power switch is connected to the power supply through the system power supply end or the system ground end, the other end of the power switch is connected to the heating element, and the other end of the heating element is connected to the power supply, when the suction detection control module determines that the resistance bridge is in the suction state, the suction detection control module controls the power switch to be normally turned on or intermittently turned on, and when the suction detection control module determines that the resistance bridge is in the non-suction state, the suction detection control module controls the power switch to remain disconnected.

[0032] A fourth aspect of an embodiment of the present application provides an airflow detection chip, which is used to connect to a resistance bridge, including:

[0033] System power pin and system ground pin, which are used to connect to the positive and negative terminals of the power supply;

[0034] A voltage input pin for receiving the output voltage of the resistance bridge;

[0035] A resistor power supply pin, which is used to connect to a resistor bridge;

[0036] A power supply control unit, which is connected to the system power supply pin and / or the system ground pin, and is also connected to the resistor power supply pin, and is used to control whether the power supply supplies power to the resistor bridge;

[0037] a puff detection control module connected to the voltage input pin and used to determine the state of the resistance bridge according to the voltage received by the voltage input pin;

[0038] Among them, the puff detection control module is also connected to the power supply control unit. When the puff detection control module determines that the resistance bridge is in a non-puff state, the puff detection control module sequentially outputs pulse signals of multiple frequencies to the power supply control unit to control the power supply control unit to be intermittently turned on, so that the power supply intermittently supplies power to the resistance bridge, and as the non-puff state continues, the frequency of the pulse signal gradually decreases, so that the power supply time of the power supply to the resistance bridge per unit time is gradually shortened.

[0039] A fifth aspect of the embodiments of the present application provides a control method for an airflow detection circuit, wherein the airflow detection circuit is used to be connected to a resistance bridge, and the control method includes:

[0040] It is learned that the resistance bridge enters the unpumped state;

[0041] triggering timing, and outputting a pulse signal of a second frequency to a power supply control unit, wherein the power supply control unit is used to control whether the power supply supplies power to the resistance bridge;

[0042] Determine whether the timing duration reaches a first timing threshold;

[0043] If the judgment result is yes, a pulse signal of a third frequency is output to the power supply control unit, wherein the length of time the power supply control unit is on per unit time when receiving the pulse signal of the third frequency is shorter than the length of time the power supply control unit is on per unit time when receiving the pulse signal of the second frequency.

[0044] In this embodiment, when the puff detection control module determines that the resistance bridge is in a non-puff state, the puff detection control module sequentially outputs pulse signals of multiple frequencies to the power supply control unit to control the power supply control unit 120 to be intermittently turned on, so that the power supply intermittently supplies power to the resistance bridge, and as the non-puff state continues, the frequency of the pulse signal gradually decreases, so that the power supply time for the resistance bridge per unit time is gradually shortened. By such a setting, when the resistance bridge just enters the non-puffing state, the electronic atomization device may still be in the user's hand, and the user may puff at any time, so that by designing a higher frequency pulse signal to the power supply control unit, the power supply control unit is turned on at a higher frequency, and the resistance bridge is powered at a higher frequency, so that the state change of the resistance bridge can be detected more timely and a quick response can be made. As the non-puffing state continues, the user has not puffed for a long time. At this time, the user may no longer hold the electronic atomization device, and the electronic atomization device is likely to have been put aside. At this time, the frequency of the pulse signal is reduced, the power supply control unit is turned on at a lower frequency, and the resistance bridge is powered at a lower frequency, so that the power consumption of the resistance bridge can be reduced, the standby power consumption can be further improved, and the standby time can be greatly improved. At this time, the resistance bridge is also powered at intervals, but the time between two adjacent power supplies is lengthened, which can save energy while also detecting changes in the state of the resistance bridge more timely. Although the response time may be slow, it is within the acceptable range for users and is more in line with user habits. Therefore, the design of the non-suction state in the present application can take into account both reducing energy consumption and timely response to user operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 This is a circuit module diagram of the electronic atomization device of the first embodiment of the present application;

[0047] Figure 2 This is a circuit module implementation diagram of an electronic atomization device according to the first embodiment of the present application;

[0048] Figure 3a This is a detailed implementation diagram of a circuit module of an electronic atomization device according to the first embodiment of the present application;

[0049] Figure 3b This is a detailed implementation diagram of a circuit module of another electronic atomization device of the first embodiment of the present application;

[0050] Figure 4 This is a partial timing diagram of the electronic atomization device of the first embodiment of the present application;

[0051] Figure 5 This is a detailed implementation diagram of a circuit module of an electronic atomization device according to another embodiment of the present application;

[0052] Figure 6 This is a detailed implementation diagram of a circuit module of an electronic atomization device according to another embodiment of the present application;

[0053] Figure 7 This is a detailed implementation diagram of a circuit module of an electronic atomization device in yet another embodiment of the present application;

[0054] Figure 8 This is a detailed implementation diagram of a circuit module of an electronic atomization device according to the second embodiment of the present application. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] The terms "including" and "having" and any variations thereof appearing in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or modules is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units that are inherent to these processes, methods, products or devices. In addition, the terms "first", "second" and "third" are used to distinguish different objects, rather than to describe a specific order. The connection of this application includes direct connection and indirect connection. Indirect connection means that other electronic components, pins, etc. may exist between the two connected components. The XX pin mentioned in this application may be an actual pin, or it may not be an actual pin, for example, it is only a pin of a component or a pin of a wire. The three situations mentioned and / or included in this application, such as A and / or B, include the three situations of A, B, A and B.

[0057] First embodiment

[0058] See also Figure 1 An embodiment of the present application provides an electronic atomization device, which may be a medical electronic atomization device, a common electronic atomization device, or other device that requires heating of liquid. The electronic atomization device uses electricity to heat the liquid and atomize it into an aerosol for inhalation by a user.

[0059] In this embodiment, the electronic atomization device includes a heating component and a power supply control component. The heating component and the power supply control component can be detachably connected or non-detachably connected. The detachable connection, for example, the heating component and the power supply control component can be plugged in, magnetically connected, or screwed together. The heating component can be separated from the power supply control component to separate the two. At this time, the heating component can be replaced with a new one as needed, and the power supply control component can be shared, which can save costs; the non-detachable connection means that the heating component cannot be replaced. At this time, the heating component and the power supply control component are directly electrically connected through a wire.

[0060] In this embodiment, the heating component includes a heating element R0, and the liquid is stored inside the heating component. The heating element R0 is in contact with the liquid. The heating element R0 is, for example, a heating wire, a heating wire, a ceramic core including a heating wire or a heating wire and a ceramic seat, a cotton core including a heating wire or a heating wire and fiber cotton, or other conventional heating elements R0. The heating element R0 is powered to heat and atomize the liquid, thereby generating an aerosol for the user to inhale.

[0061] In this embodiment, the power supply control component includes a power supply 110, a resistance bridge 200, and an airflow detection circuit. The power supply 110 can be a battery, an AC-DC converter, a DC-DC converter, etc., preferably a battery, and the voltage range of the power supply 110 is, for example, 3V-5V, etc. The resistance bridge 200 is configured so that the flow of airflow causes a change in resistance. One implementation of the resistance bridge 200 is a Wheatstone bridge. Specifically, the resistance bridge 200 includes four resistors, namely a first resistor R21, a second resistor R22, a third resistor R23, and a fourth resistor R24, wherein the first resistor R21 is connected in series with the second resistor R22, the third resistor R23 is connected in series with the fourth resistor R24, and the branch formed by the first resistor R21 and the second resistor R22 in series and the branch formed by the third resistor R23 and the fourth resistor R24 ​​in series are connected in parallel, wherein one of the four resistors is connected to the airflow. The present embodiment is related to the flow, and the resistor is the third resistor R23 as an example for explanation. When the airflow flows through the third resistor R23, the resistance of the third resistor R23 will change, the resistance of the branch where the third resistor R23 and the fourth resistor R24 ​​are located will change, and the total resistance of the resistor bridge 200 will also change. For example, when there is no airflow or the airflow is very small, the resistance of the third resistor R23 is the standard resistance. When the user sucks and the air pressure at the third resistor R23 decreases, the resistance of the third resistor R23 will increase, for example, relative to the standard resistance. When the user blows and the air pressure at the third resistor R23 increases, the resistance of the third resistor R23 will decrease, for example, relative to the standard resistance (this embodiment is explained as an example), or the relationship between the resistance value and the air pressure change is reversed. The present application determines whether it is suction, blowing, or no airflow by detecting the change in the resistance value of the third resistor R23, and the corresponding states are suction state, blowing state, and unused state, wherein the blowing state and the unused state constitute the unsucked state. In addition, in other embodiments of the present application, the resistance value of the third resistor R23 does not change with the airflow, and the resistance value of one of the first resistor R21, the second resistor R22, and the fourth resistor R24 ​​may change with the airflow, and those skilled in the art may adjust the corresponding relationship as needed. In addition, in other embodiments of the present application, multiple resistors among the four resistors may be related to the airflow.

[0062] In order to detect the resistance change of the third resistor R23, in the present embodiment, when the electronic atomization device is in an unused state, the ratio of the resistance of the first resistor R21 to the resistance of the second resistor R22 is equal to the ratio of the resistance of the third resistor R23 to the resistance of the fourth resistor R24. For example, the resistances of the first resistor R21 to the fourth resistor R24 ​​are all 10kΩ. When the electronic atomization device is in the suction state, since the resistance values ​​of the first resistor R21, the second resistor R22, and the fourth resistor R24 ​​are almost unchanged, the resistance value of the third resistor R23 will increase relative to the standard resistance value, resulting in the ratio of the resistance value of the first resistor R21 to the resistance value of the second resistor R22 being smaller than the ratio of the resistance value of the third resistor R23 to the resistance value of the fourth resistor R24. When the electronic atomization device is in the blowing state, since the resistance values ​​of the first resistor R21, the second resistor R22, and the fourth resistor R24 ​​are almost unchanged, the resistance value of the third resistor R23 will decrease relative to the standard resistance value, resulting in the ratio of the resistance value of the first resistor R21 to the resistance value of the second resistor R22 being larger than the ratio of the resistance value of the third resistor R23 to the resistance value of the fourth resistor R24.

[0063] Since the change of the resistance value itself is difficult to measure, the present application converts the change of the resistance value of the resistor into a voltage change for measurement, which is relatively easy to implement and has low cost. Specifically, the resistance bridge 200 also includes a bridge power supply terminal VDD, a bridge ground terminal VSS, a first voltage output terminal Vout1 and a second voltage output terminal Vout2, wherein the connection point where the first resistor R21 and the third resistor R23 are connected is called a first connection point, the first connection point is connected to the bridge power supply terminal VDD, the connection point where the second resistor R22 and the fourth resistor R24 ​​are connected is called a second connection point, the second connection point is connected to the bridge ground terminal VSS, the connection point where the first resistor R21 and the second resistor R22 are connected is called a third connection point, the third connection point is connected to the first voltage output terminal Vout1, the connection point where the third resistor R23 and the fourth resistor R24 ​​are connected is called a fourth connection point, and the fourth connection point is connected to the second voltage output terminal Vout2. The bridge power supply terminal VDD and the bridge ground terminal VSS are connected to the positive terminal and the negative terminal of the power supply 110 respectively, so that when the power supply 110 supplies power to the resistance bridge 200, the first voltage output terminal Vout1 and the second voltage output terminal Vout2 will output corresponding voltages. When the airflow causes the resistance value of the third resistor R23 to change, the voltage of the second voltage output terminal Vout2 will also change accordingly.

[0064] In this embodiment, the airflow detection circuit includes a system power supply terminal VBAT+, a system ground terminal VBAT-, a voltage input terminal SW, and a resistor power supply terminal GD. Among them, the system power supply terminal VBAT+ is connected to the positive terminal of the power supply 110, and the system ground terminal VBAT- is connected to the negative terminal of the power supply 110. The number of the resistor power supply terminal GD can be one or two. When it is one, the resistor power supply terminal GD is connected to one of the bridge power supply terminal VDD and the bridge ground terminal VSS of the resistor bridge 200, and the other of the bridge power supply terminal VDD and the bridge ground terminal VSS is connected to the system power supply terminal VBAT+ or the system ground terminal VBAT-. When the number of the resistor power supply terminal GD is two, the two resistor power supply terminals GD are called the first resistor power supply terminal GD1 and the second resistor power supply terminal GD2. The first resistor power supply terminal GD1 is connected to the bridge power supply terminal VDD, and the second resistor power supply terminal GD2 is connected to the bridge ground terminal VSS. This embodiment is described by taking the number of the resistor power supply terminal GD as one as an example. In this embodiment, the resistor power supply terminal GD is connected to the bridge power supply terminal VDD, and the bridge ground terminal VSS is connected to the system ground terminal VBAT-. In this embodiment, the number of voltage input terminals SW is two, and the two voltage input terminals SW are called the first voltage input terminal SW1 and the second voltage input terminal SW2, wherein the first voltage input terminal SW1 is connected to the first voltage output terminal Vout1 of the resistor bridge 200, and the second voltage input terminal SW2 is connected to the second voltage output terminal Vout2 of the resistor bridge 200, and the voltage difference between the first voltage output terminal Vout1 and the second voltage output terminal Vout2 is the output voltage. In addition, in other embodiments of the present application, the number of voltage input terminals SW can also be one, in which case the voltage input terminal SW is connected to the second voltage output terminal Vout2 (the resistor bridge 200 includes two resistors and one resistor).

[0065] In this embodiment, the airflow detection circuit further includes a power supply control unit 120, which is used to control whether the power supply 110 supplies power to the resistance bridge 200. When the power supply control unit 120 is disconnected, the power supply 110 does not supply power to the resistance bridge 200. The voltage output by the first voltage output terminal Vout1 is, for example, the voltage of the system ground terminal VBAT- or the voltage of the system power supply terminal VBAT+. The voltage output by the second voltage output terminal Vout2 is, for example, also the voltage of the system ground terminal VBAT- or the voltage of the system power supply terminal VBAT+. At this time, the voltage difference between the first voltage input terminal SW1 and the second voltage input terminal SW2 is 0, and there is no current in the resistance bridge 200. When the power supply control unit 120 is turned on, the power supply 110 supplies power to the resistance bridge 200, and there is current in the resistance bridge 200. At this time, the voltage output by the first voltage output terminal Vout1 is as follows:

[0066] Vin1*R1 / (R1+R2);

[0067] Wherein, Vin1 is the voltage at the bridge power supply terminal VDD, R1 is the resistance value of the first resistor R21, and R2 is the resistance value of the second resistor R22.

[0068] At this time, the voltage of the second voltage output terminal Vout2 is as follows:

[0069] Vin1*R3 / (R3+R4);

[0070] Wherein, Vin1 is the voltage at the bridge power supply terminal VDD, R3 is the resistance value of the third resistor R23 at this time, and R4 is the resistance value of the fourth resistor R24.

[0071] When there is no airflow, Vin1*R1 / (R1+R2)=Vin1*R3 / (R3+R4), so that the voltage output by the first voltage output terminal Vout1 is equal to the voltage output by the second voltage output terminal Vout2. At this time, the voltage difference between the first voltage input terminal SW1 and the second voltage input terminal SW2 is 0, which corresponds to the unused state. When there is airflow, the resistance value of the third resistor R23 will change, and the resistance value will increase or decrease. At this time, Vin1*R1 / (R1+R2) is not equal to Vin1*R3 / (R3+R4). For example, Vin1*R1 / (R1+R2) is 3% larger than Vin1*R3 / (R3+R4) (preset threshold), which corresponds to the suction state, and Vin1*R1 / (R1+R2) is 3% smaller than Vin1*R3 / (R3+R4) (preset threshold), which corresponds to the blowing state, or vice versa. Thus, this embodiment determines whether the resistance bridge 200 is in the suction state or the non-suction state by detecting the voltage difference between the first voltage input terminal SW1 and the second voltage input terminal SW2. In addition, in other embodiments of the present application, it can also be set to the opposite: when there is no airflow, Vin1*R1 / (R1+R2) and Vin1*R3 / (R3+R4) have a large difference, for example, the difference exceeds 5%, and when there is airflow, the difference between Vin1*R1 / (R1+R2) and Vin1*R3 / (R3+R4) becomes smaller or equal, and the difference is small, for example, not more than 3%. This application does not limit the size relationship.

[0072] Please continue to refer to Figure 1 and Figure 2In this embodiment, the airflow detection circuit also includes a suction detection control module 300 and a power switch M1. The suction detection control module 300 is connected to the first voltage input terminal SW1 and the second voltage input terminal SW2 respectively. The suction detection control module 300 is also connected to the power supply control unit 120. The suction detection control module 300 is used to control whether the power supply control unit 120 is turned on or off. When the suction detection control module 300 controls the power supply control unit 120 to be turned on, the power supply 110 can supply power to the resistance bridge 200, that is, the power supply 110 and the resistance bridge 200 can form a conduction loop. When the suction detection control module 300 controls the power supply control unit 120 to be turned off, the power supply 110 cannot supply power to the resistance bridge 200, that is, the power supply 110 and the resistance bridge 200 cannot form a conduction loop. In this embodiment, the output end of the puff detection control module 300 is also connected to the control end of the power switch M1, the first end of the power switch M1 is connected to the system power supply end VBAT+ or the system ground end VBAT-, the second end of the power switch M1 is connected to one end of the heating element R0 through the atomization end AT, and the other end of the heating element R0 is correspondingly connected to the negative end of the power supply 110 or the positive end of the power supply 110.

[0073] In this embodiment, when the resistance bridge 200 is powered, the suction detection control module 300 determines whether the resistance bridge 200 is in a suction state or a non-suction state through the voltage difference between the first voltage input terminal SW1 and the second voltage input terminal SW2, and then determines whether the electronic atomization device is in a suction state or a non-suction state. When the resistance bridge 200 is not powered, the suction detection control module 300 defaults to the same state as the previous resistance bridge 200 when it is powered on (the electronic atomization device defaults to a non-suction state when it is just powered on, and the power supply control unit 120 is initially controlled by a pulse signal of the second frequency mentioned later). When the suction detection control module 300 determines that the resistance bridge 200 is in a suction state, the suction detection control module 300 controls the power switch M1 to be normally turned on or intermittently turned on to generate an aerosol by atomizing the liquid. When the suction detection control module 300 determines that the resistance bridge 200 is in a non-suction state, the suction detection control module 300 controls the power switch M1 to be normally turned off, and the heating element R0 does not heat.

[0074] In this embodiment, when the puff detection control module 300 determines that the resistance bridge 200 is in the puff state, the puff detection control module 300 controls the power supply control unit 120 to be always on or intermittently on. When intermittently on, the puff detection control module 300 outputs a pulse signal of a first frequency to the power supply control unit 120, wherein the first frequency is greater than the second frequency mentioned later. By making the power supply control unit 120 always on or intermittently on, the puff detection control module 300 can detect the change of the state of the resistance bridge 200 in a relatively timely manner.

[0075] In order to reduce standby power consumption, in the present embodiment, when the puff detection control module 300 determines that the electronic atomization device is in a non-puff state, the puff detection control module 300 sequentially outputs pulse signals of multiple frequencies to the power supply control unit 120 to control the intermittent conduction of the power supply control unit 120, so that the power supply 110 intermittently supplies power to the resistance bridge 200, and the frequency of the pulse signal gradually decreases as the non-puff state continues, so that the power supply time of the power supply 110 to the resistance bridge 200 per unit time is shortened. For example, the puff detection control module 300 can generate a plurality of pulse signals of frequencies, such as a pulse signal of a second frequency, a pulse signal of a third frequency, a pulse signal of a fourth frequency, ..., which means in sequence: when the resistance bridge 200 just enters the non-puff state from the puff state, the puff detection control module 300 outputs a pulse signal of the second frequency to the power supply control unit 120; after entering the non-puff state for a first preset time period, the puff detection control module 300 outputs a pulse signal of the third frequency to the power supply control unit 120; after entering the non-puff state for a second preset time period, wherein the second preset time period is greater than the first preset time period, the puff detection control module 300 outputs a pulse signal of the fourth frequency to the power supply control unit 120, ..., The second frequency is greater than the third frequency, the third frequency is greater than the fourth frequency, and when the puff detection control module 300 outputs a pulse signal of the second frequency, the power supply time length per unit time of the power supply 110 to the resistance bridge 200 is greater than the power supply time length per unit time of the power supply 110 to the resistance bridge 200 when the puff detection control module 300 outputs a pulse signal of the third frequency, and when the puff detection control module 300 outputs a pulse signal of the third frequency, the power supply time length per unit time of the power supply 110 to the resistance bridge 200 is greater than the power supply time length per unit time of the power supply 110 to the resistance bridge 200 when the puff detection control module 300 outputs a pulse signal of the fourth frequency, that is, as the non-puffing state continues, the power supply time length per unit time of the resistance bridge 200 is shortened. In this embodiment, the unit time is, for example, 1s, 10s, etc. When the puff detection control module 300 determines that the resistance bridge 200 changes from the non-puff state to the puff state, the puff detection control module 300 controls the power supply control unit 120 to be always on or controls the power supply control unit 120 to be intermittently on with a pulse signal of the first frequency.

[0076] In this embodiment, when the puff detection control module 300 determines that the resistance bridge 200 is in a non-puff state, the puff detection control module 300 sequentially outputs pulse signals of multiple frequencies to the power supply control unit 120 to control the intermittent conduction of the power supply control unit 120, so that the power supply 110 intermittently supplies power to the resistance bridge 200, and as the non-puff state continues, the frequency of the pulse signal gradually decreases, so that the power supply time of the power supply 110 to the resistance bridge 200 per unit time is gradually shortened. By such a setting, when the resistance bridge 200 just enters the non-puffing state, the electronic atomization device may still be in the user's hand at this time, and the user may take a puff at any time, so that by designing a higher frequency pulse signal to the power supply control unit 120, the power supply control unit 120 is turned on at a higher frequency, and the resistance bridge 200 is powered at a higher frequency, so that the state change of the resistance bridge 200 can be detected relatively timely and can respond quickly. As the non-puffing state continues, the user does not take a puff for a relatively long time. At this time, the user may no longer hold the electronic atomization device, and the electronic atomization device has been put aside. At this time, the frequency of the pulse signal is reduced, the frequency of the power supply control unit 120 is reduced, and the frequency of the resistance bridge 200 being powered is also reduced, so that the power consumption of the resistance bridge 200 can be reduced, the standby power consumption can be further improved, and the standby time can be improved. At this time, the resistance bridge 200 is also powered at intervals, but the duration of two adjacent power supplies is prolonged, while saving energy consumption, the change of the state of the resistance bridge 200 can be detected relatively timely. Although the response time may be relatively slow, it is within the acceptable range for users and is more in line with the user's usage habits. Therefore, the design of the non-suction state of the present application can take into account both reducing energy consumption and responding to user operations.

[0077] This embodiment is described by taking pulse signals of two frequencies as an example. Specifically, the puff detection control module 300 includes a timing unit 321, which is used to time the duration of the non-puff state. When the puff detection control module 300 determines that the resistance bridge 200 enters the non-puff state from the puff state, the timing unit 321 is triggered to start timing from 0, and at the same time, the puff detection control module 300 outputs a pulse signal of the second frequency to the power supply control unit 120 to control its intermittent conduction. If the non-puff state continues, when the timing unit 321 times to a preset first timing threshold, the puff detection control module 300 outputs a pulse signal of the third frequency to the power supply control unit 120 to control its intermittent conduction. Thereafter, the timing unit 321 can be reset to zero to reduce power consumption (it can also continue to time). If the timing unit 321 has not reached the first timing threshold, the resistance bridge 200 changes from the non-puff state to the puff state, and the timing unit 321 is reset to zero at this time. In this embodiment, the third frequency is less than the second frequency, for example, the second frequency is 20 Hz, and the third frequency is 10 Hz. When the power supply control unit 120 receives a pulse signal of the third frequency, the duration of conduction in a unit time is shorter than when the power supply control unit 120 receives a pulse signal of the second frequency. The unit time is, for example, 1 s, 10 s, etc. When the power supply control unit 120 receives a pulse signal of the second frequency within 1 s, the conduction duration is, for example, 0.5 s, so that the power supply 110 supplies power to the resistance bridge 200 for 0.5 s. When the power supply control unit 120 receives a pulse signal of the third frequency within 1 s, the conduction duration is, for example, 0.25 s, so that the power supply 110 supplies power to the resistance bridge 200 for 0.25 s. In this embodiment, when the resistance bridge 200 changes from a non-puffing state to a puffing state or reaches the last timing threshold, the timing unit 321 is reset to zero.

[0078] In this embodiment, the puff detection control module 300 includes a puff detection unit 310 and a logic pulse control unit 320. The puff detection unit 310 includes a differential amplifier unit 311, a voltage comparison unit 312, and a reference voltage generation unit 313. The two input terminals of the differential amplifier unit 311 are connected to the first voltage input terminal SW1 and the second voltage input terminal SW2 respectively, the output terminal of the differential amplifier unit 311 is directly or indirectly connected to one input terminal of the voltage comparison unit 312, and the other input terminal of the voltage comparison unit 312 is connected to the reference voltage generation unit 313. The reference voltage generation unit 313 is used to generate a second reference voltage Vref2. The reference voltage generation unit 313 can be a conventional bandgap voltage reference. This embodiment is described by taking this as an example. The output terminal of the voltage comparison unit 312 is connected to the logic pulse control unit 320, and the logic pulse control unit 320 is directly or indirectly connected to the control terminal of the power switch M1. In this embodiment, the differential amplifier subunit 311 is used to amplify the voltage difference between the first voltage input terminal SW1 and the second voltage input terminal SW2 and then output it. The output voltage is input to the voltage comparison subunit 312. The voltage comparison subunit 312 compares the input voltage with the second reference voltage Vref2. If the input voltage is greater than or equal to the second reference voltage Vref2, it indicates that the electronic atomization device is inhaled, and the resistance bridge 200 is in the inhalation state. The voltage comparison subunit 312 outputs a suction signal. If the input voltage is less than the second reference voltage Vref2, it indicates that the electronic atomization device is not inhaled, and the resistance bridge 200 is in the non-inhalation state (this embodiment is described as an example), and the voltage comparison subunit 312 outputs a non-inhalation signal, or the magnitude relationship is reversed. The voltage comparison subunit 312 outputs a suction signal or a non-inhalation signal to the logic pulse control unit 320, and thereafter the logic pulse control unit 320 controls the power switch M1 and the power supply control unit 120 accordingly. In addition, in other embodiments of the present application, the suction detection module can also be provided with other module units as needed.

[0079] In this embodiment, the logic pulse control unit 320 includes a pulse signal generating unit 330 and the aforementioned timing unit 321. The timing unit 321 is respectively connected to the puff detection unit 310 and the pulse signal generating unit 330. The pulse signal generating unit 330 is connected to the power supply control unit 120. When the signal output by the puff detection unit 310 changes from a puff signal to a no-puff signal, the signal received by the timing unit 321 also changes from a puff signal to a no-puff signal. The timing unit 321 is triggered to start timing from 0. At the same time, the pulse signal generating unit 330 generates a pulse signal of a second frequency and outputs it to the power supply control unit 120. When the timing unit 321 times from 0 to the first timing threshold, the timing unit 321 outputs a second signal to the pulse signal generating unit 330. The pulse signal generating unit 330 generates a pulse signal of a third frequency and outputs it to the power supply control unit 120.

[0080] In order to realize the switching of the output signal of the pulse signal generating unit 330, see Figure 3a and Figure 4 In this embodiment, the pulse signal generating unit 330 includes a first pulse generating subunit 331, a second pulse generating subunit 332, and a selecting subunit 333. The logic pulse control unit 320 includes a logic gate unit 322, wherein the first pulse generating subunit 331 is used to generate a pulse signal of a second frequency, and the second pulse generating subunit 332 is used to generate a pulse signal of a third frequency. The two input ends of the selecting subunit 333 are respectively connected to the first pulse generating subunit 331 and the second pulse generating subunit 332, and the output end of the selecting subunit 333 is directly or indirectly connected to the power supply control unit 120. The selecting end of the selecting subunit 333 is connected to the logic gate unit 322, and the two input ends of the logic gate unit 322 are respectively connected to the suction detection unit 310 and the timing unit 321. When the puff detection unit 310 starts to output the no-puff signal, the logic gate unit 322 controls the selection subunit 333 to select the second frequency pulse signal output. When the timing unit 321 times to the first timing threshold, the timing unit 321 outputs the second intermediate signal, the logic gate unit 322 controls the selection subunit 333 to select the third frequency pulse signal output. In addition, in other embodiments of the present application, please refer to Figure 3b, the logic gate unit 322 may not be provided, in which case the selection end of the selection subunit 333 is connected to the timing unit 321. When the puff detection unit 310 starts to output the no-puff signal, the timing unit 321 is triggered to start timing from 0 and output the first intermediate signal to the selection subunit 333. The selection subunit 333 selects the second frequency pulse signal to output. When the timing unit 321 times to the first timing threshold, the timing unit 321 outputs the second intermediate signal to the selection subunit 333. The selection subunit 333 selects the third frequency pulse signal to output. In this embodiment, the logic gate unit 322 may be an AND gate, an OR gate, or a combination of two of the AND gate, the OR gate, and the NOT gate, or a combination of the three.

[0081] In addition, in other embodiments of the present application, see Figure 5 The pulse signal generating unit 330 itself can be used to generate a pulse signal of a second frequency and a pulse signal of a third frequency. The output end of the pulse signal generating unit 330 is connected to the power supply control unit 120, and the selection end of the pulse generating unit is connected to the logic gate unit 322 or the timing unit 321. When the puff detection unit 310 starts to output a no-puff signal, the pulse signal generating unit 330 generates a pulse signal output of the second frequency. When the timing unit 321 times to the first timing threshold, the pulse signal generating unit 330 generates a pulse signal output of the third frequency.

[0082] In order to realize that the power supply control unit 120 controls whether the power supply 110 supplies power to the resistance bridge 200, please continue to refer to Figure 3aIn this embodiment, the power supply control unit 120 includes a buck stabilizing unit, which is used to reduce the power consumption of the resistance bridge 200 . In the present embodiment, one implementation of the step-down voltage regulator unit is a low dropout regulator (LDO), which includes an operational amplifier 122, a first sampling resistor Rc1, a second sampling resistor Rc2, and an adjustment tube 121, wherein an input end of the adjustment tube 121 is electrically connected to a system power supply terminal VBAT+, an output end of the adjustment tube 121 is directly or indirectly connected to a resistor power supply terminal GD, a control end of the adjustment tube 121 is electrically connected to an output end of the operational amplifier 122, a first end of the operational amplifier 122 is connected to a first reference voltage Vref1, and the first reference voltage Vref1 is, for example, 1V, a second end of the operational amplifier 122 is electrically connected to a first end of the second sampling resistor Rc2, a first end of the first sampling resistor Rc1 is electrically connected to the output end of the adjustment tube 121, a second end of the first sampling resistor Rc1 is electrically connected to a first end of the second sampling resistor Rc2, and a second end of the second sampling resistor Rc2 is electrically connected to a system ground terminal VBAT-. The principle of the low-dropout linear regulator is common knowledge in the art and will not be described in detail here. In addition, it can also be other conventional buck-stabilizing units in the art. In the figure, the adjustment tube 121 is a triode, but the present application is not limited to this. In other embodiments of the present application, the adjustment tube 121 can also be a MOS tube. This embodiment uses a low-dropout linear regulator to perform a step-down process, which can achieve very high efficiency, is beneficial to reduce the power consumption when the resistance bridge 200 is powered, and has low cost, low noise, and small quiescent current. In this embodiment, the power supply control unit 120 is turned on, which means that the adjustment tube 121 is turned on, and the power supply control unit 120 is disconnected and cut off, which means that the adjustment tube 121 is disconnected and cut off.

[0083] In this embodiment, the enable terminal of the operational amplifier 122 is connected to the output terminal of the selection subunit 333 to receive the pulse signal. When the output of the pulse signal is an enable signal (e.g., a high level), the operational amplifier 122 is enabled to work, so that the power supply 110 supplies power to the resistance bridge 200. When the output of the pulse signal is a disable signal (e.g., a low level), the operational amplifier 122 is disabled and does not work. At this time, the adjustment tube 121 is disconnected and cut off, so that the power supply 110 does not supply power to the resistance bridge 200, and the resistance bridge 200 does not consume power. When the enable terminal of the operational amplifier 122 receives a pulse signal of the second frequency, the operational amplifier 122 works for a longer period of time per unit time, and the adjustment tube 121 is turned on for a longer period of time. When the enable terminal of the operational amplifier 122 receives a pulse signal of the third frequency, the operational amplifier 122 works for a shorter period of time per unit time, and the adjustment tube 121 is turned on for a shorter period of time.

[0084] In addition, the power supply control unit 120 is not limited to a low voltage drop linear regulator. In other embodiments of the present application, see Figure 6 The power supply control unit 120 includes a first switch K1, a first end of the first switch K1 is connected to the system power supply terminal VBAT+, and a second end of the first switch K1 is connected to the bridge ground terminal VSS. The first switch K1 can control whether the power supply 110 supplies power to the resistance bridge 200. In this embodiment, the first switch K1 is a MOS tube, a triode, etc., and the MOS tube is, for example, a PMOS tube, an NMOS tube. Figure 6 The first switch K1 is a PMOS tube. In addition, in other embodiments of the present application, the first end of the first switch K1 is connected to the system ground terminal VBAT-, the second end of the first switch K1 is connected to the resistor power supply terminal GD, and the bridge power supply terminal VDD of the resistor bridge 200 is connected to the system power supply terminal VBAT+, and the first switch K1 is preferably an NMOS tube. In this embodiment, the control end of the first switch K1 receives the pulse signal via an odd number of inverters (the first switch K1 is a PMOS tube at this time) or an even number (including 0) of inverters (the first switch K1 is an NMOS tube at this time). When the output of the pulse signal is a high level, the first switch K1 is turned on, so that the power supply 110 supplies power to the resistor bridge 200. When the output of the pulse signal is a low level, the first switch K1 is turned off, so that the power supply 110 does not supply power to the resistor bridge 200, and the resistor bridge 200 does not consume power at this time. When the control end of the first switch K1 receives a pulse signal of the second frequency, the first switch K1 is turned on for a longer period of time per unit time, and when the control end of the first switch K1 receives a pulse signal of the third frequency, the first switch K1 is turned on for a shorter period of time per unit time. In this case, since the power supply 110 directly supplies power to the resistance bridge 200, the energy consumption of the resistance bridge 200 will be relatively high when the first switch K1 is turned on.

[0085] In addition, the power supply control unit 120 is not limited to a low voltage drop linear regulator. In other embodiments of the present application, see Figure 7, the power supply control unit 120 includes a constant current source and a first switch K1, and the constant current source is connected in series with the first switch K1. Specifically, the number of the resistor power supply terminal GD includes two: a first resistor power supply terminal GD1 and a second resistor power supply terminal GD2, the first resistor power supply terminal GD1 is connected to the system power supply terminal VBAT+ via the first switch K1, the second resistor power supply terminal GD2 is connected to the system ground terminal VBAT- via the constant current source, the first resistor power supply terminal GD1 is connected to the bridge power supply terminal VDD of the resistor bridge 200, and the second resistor power supply terminal GD2 is connected to the bridge ground terminal VSS of the resistor bridge 200. In addition, in other embodiments of the present application, the positions of the first switch K1 and the constant current source can also be swapped. In addition, in other embodiments of the present application, the second resistor power supply terminal GD2 may not be provided, and at this time the constant current source and the first switch K1 are located between the first resistor power supply terminal GD1 and the system power supply terminal VBAT+, and the system ground terminal VBAT- is connected to the bridge ground terminal VSS of the resistor bridge 200. In addition, in other embodiments of the present application, the first resistor power supply terminal GD1 may not be provided. In this case, the constant current source and the first switch K1 are located between the second resistor power supply terminal GD2 and the system ground terminal VBAT-, and the system power supply terminal VBAT+ is connected to the bridge power supply terminal VDD of the resistor bridge 200. Here, the control end of the first switch K1 receives the pulse signal via an odd number of inverters (the first switch K1 is a PMOS tube at this time) or an even number (including 0) of inverters (the first switch K1 is an NMOS tube at this time). When the output of the pulse signal is a high level, the first switch K1 is turned on and turned on, so that the power supply 110 supplies power to the resistor bridge 200. When the output of the pulse signal is a low level, the first switch K1 is turned off and turned off. The constant current source is added here to reduce the power consumption of the resistor bridge 200 when it is working. Since the output current of the constant current source is controlled, the output current of the constant current source can be set very small, so that the energy consumption of the resistor bridge 200 can be reduced when the first switch K1 is turned on.

[0086] In this embodiment, the airflow detection circuit and the resistance bridge 200 constitute an airflow detection component, and the airflow detection component is located in the power supply control component. In addition, in other embodiments of the present application, the airflow detection component can also be located in the heating component. In addition, in other embodiments of the present application, the airflow detection component can also be partially located in the power supply control unit 120 and partially located in the heating component.

[0087] In this embodiment, when the resistance bridge 200 is in the puffing state, the puff detection control module 300 controls the power supply control unit 120 to be continuously turned on or intermittently turned on. The implementation method of the puff detection control module 300 controlling the power supply control unit 120 to be continuously turned on can be referred to the applicant's prior application CN202311127344.4, which will not be repeated here. The puff detection control module 300 outputs a pulse signal of a first frequency to the power supply control unit 120 to control its intermittent conduction. The generation method of the pulse signal of the first frequency can be referred to Figure 3a , Figure 5 , those skilled in the art can implement it through simple modification, which will not be described in detail here.

[0088] In addition, in other embodiments of the present application, the resistance bridge 200 may not be a Wheatstone bridge. The resistance bridge 200 only includes two resistors, the two resistors are a third resistor R23 and a fourth resistor R24. The resistance bridge 200 does not include the first voltage output terminal Vout1. In this solution, one input terminal of the differential amplifier unit 311 is connected to the second voltage output terminal Vout2, and the other input terminal of the differential amplifier unit 311 is connected to the third reference voltage. When there is no airflow, the third reference voltage is equal to the voltage of the second voltage output terminal Vout2. When there is airflow, there is a difference between the voltages of the two input terminals of the differential amplifier unit 311. In addition, in other embodiments of the present application, the resistance bridge 200 may also include only one resistor, that is, the third resistor R23. At this time, the first end or the second end of the third resistor R23 is the second voltage output terminal Vout2. At this time, the power supply control unit 120 includes a constant current source (see Figure 7 ), the constant current source is connected in series with the third resistor R23, and the preferred constant current source is connected to the system power supply terminal VBAT+. At this time, the second voltage output terminal Vout2 is connected to one input terminal of the differential amplifier unit 311, and the other input terminal of the differential amplifier unit 311 is connected to the third reference voltage. When there is no airflow, the third reference voltage is equal to the voltage of the second voltage output terminal Vout2. When there is airflow, there is a difference between the voltages of the two input terminals of the differential amplifier unit 311. In addition, in other embodiments of the present application, it can also be set to the opposite: when there is no airflow, there is a large difference between the voltages of the two input terminals of the differential amplifier unit 311, for example, the difference exceeds 5%. When there is airflow, the difference between the voltages of the two input terminals of the differential amplifier unit 311 becomes smaller or equal, and the difference is small, for example, not more than 3%.

[0089] In this embodiment, the resistance bridge 200 may preferably be formed as a MEMS (Micro-Electro-Mechanical System). In this case, the resistance bridge 200 is formed on the same semiconductor substrate.

[0090] In this embodiment, the airflow detection circuit is made on the same semiconductor substrate, that is, it is located on the same chip, which is called an airflow detection chip. At this time, the system power supply terminal VBAT+ corresponds to the system power supply pin, the system ground terminal VBAT- corresponds to the system ground pin, the voltage input terminal SW corresponds to the voltage input pin, the resistor power supply terminal GD corresponds to the resistor power supply pin, and the atomization terminal AT corresponds to the atomization pin. At this time, the resistor bridge 200 is made on another semiconductor substrate. However, the present application is not limited to this. In other embodiments of the present application, the airflow detection circuit except the power switch M1 is made on the same semiconductor substrate, and the power switch M1 is made on another semiconductor substrate. In addition, in other embodiments of the present application, the airflow detection circuit and some resistors in the resistor bridge 200 (excluding the third resistor R23) are made on the same semiconductor substrate, and the third resistor R23 and the like are made on another semiconductor substrate. In addition, in other embodiments of the present application, the circuit of the airflow detection circuit except the power switch M1 and some resistors in the resistance bridge 200 (excluding the third resistor R23) are made on the same semiconductor substrate, the third resistor R23 and others are made on another semiconductor substrate, and the power switch M1 is made on another semiconductor substrate.

[0091] In addition, the embodiment of the present application further provides a control method of an airflow detection circuit, wherein the airflow detection circuit is used to be connected to the resistance bridge 200, and the control method includes:

[0092] S10: learning that the resistance bridge 200 enters a non-pumping state;

[0093] S20: triggering timing, and outputting a pulse signal of a second frequency to the power supply control unit 120, wherein the power supply control unit 120 is used to control whether the power supply 110 supplies power to the resistance bridge 200;

[0094] S30: Determine whether the timing duration reaches a first timing threshold;

[0095] S40: If the judgment result is yes, a pulse signal of a third frequency is output to the power supply control unit 120, wherein the duration of conduction per unit time when the power supply control unit 120 receives the pulse signal of the third frequency is shorter than the duration of conduction per unit time when the power supply control unit 120 receives the pulse signal of the second frequency.

[0096] The details of the above control method can be referred to the previous and following descriptions, which will not be repeated here.

[0097] Second embodiment

[0098] See also Figure 8 , Figure 8This is a circuit module diagram of the electronic atomization device of the second embodiment of the present application. This embodiment is similar to the first embodiment, so the parts not described in this embodiment can refer to the first embodiment. The main difference between this embodiment and the first embodiment is that the puff detection unit 310 is also intermittently turned on.

[0099] To further reduce power consumption when not pumping, see Figure 8 In the present embodiment, the puff detection unit 310 is also connected to the logic pulse control unit 320. When the puff detection unit 310 determines that the resistance bridge 200 is in a non-puff state, the logic pulse control unit 320 sequentially outputs pulse signals of multiple frequencies to the puff detection unit 310 to control at least some subunits of the puff detection unit 310 to work intermittently. As the frequency of the pulse signal in the non-puff state continues, the frequency of the pulse signal gradually decreases, so that the working time of at least some subunits is reduced. In the present embodiment, all subunits of the puff detection unit 310 work intermittently in the non-puff state.

[0100] Specifically, in this embodiment, the enable ends of the differential amplifier subunit 311 , the voltage comparison subunit 312 , and the reference voltage generation subunit 313 are all connected to the logic pulse control unit 320 , specifically to the output end of the pulse signal generation unit 330 . When the puff detection unit 310 determines that the resistance bridge 200 is in a non-puff state, the pulse signal generating unit 330 sequentially outputs pulse signals of multiple frequencies to the enable end of the differential amplifier unit 311, the enable end of the voltage comparison unit 312, and the enable end of the reference voltage generating unit 313, so as to control the differential amplifier unit 311, the voltage comparison unit 312, and the reference voltage generating unit 313 to work synchronously and intermittently. When the output of the pulse signal is an enable signal (for example, a high level), the differential amplifier unit 311, the voltage comparison unit 312, and the reference voltage generating unit 313 all work synchronously, and the puff detection unit 310 consumes power at this time; when the output of the pulse signal is a disable signal (for example, a low level), the differential amplifier unit 311, the voltage comparison unit 312, and the reference voltage generating unit 313 all do not work synchronously, and the puff detection unit 310 does not consume power at this time. As the non-inhalation state continues, the frequency of the pulse signal output by the pulse signal generating unit 330 gradually decreases, so that the working time of the differential amplifier subunit 311, the voltage comparison subunit 312, and the reference voltage generating subunit 313 per unit time is reduced, thereby further reducing energy consumption.For example, the pulse signal generating unit 330 can sequentially output pulse signals of multiple frequencies, such as a pulse signal of a second frequency, a pulse signal of a third frequency, a pulse signal of a fourth frequency, ..., when the resistance bridge 200 just enters the non-puffing state, the pulse signal generating unit 330 outputs a pulse signal of the second frequency to the puffing detection unit 310, after entering the non-puffing state for a first preset time period, the pulse signal generating unit 330 outputs a pulse signal of the third frequency to the puffing detection unit 310, after entering the non-puffing state for a second preset time period, wherein the second preset time period is greater than the first preset time period, the pulse signal generating unit 330 outputs a pulse signal of the fourth frequency to the puffing detection unit 310, ..., wherein the second frequency is greater than the third frequency, the third frequency is greater than the fourth frequency, and the pulse signal generating unit 330 outputs the pulse signal of the second frequency when the differential amplifier The working time per unit time of the differential amplifier subunit 311, the voltage comparison subunit 312, and the reference voltage generating subunit 313 is longer than the working time per unit time of the differential amplifier subunit 311, the voltage comparison subunit 312, and the reference voltage generating subunit 313 when the pulse signal generating unit 330 outputs a pulse signal of the third frequency. The working time per unit time of the differential amplifier subunit 311, the voltage comparison subunit 312, and the reference voltage generating subunit 313 when the pulse signal generating unit 330 outputs a pulse signal of the third frequency is longer than the working time per unit time of the differential amplifier subunit 311, the voltage comparison subunit 312, and the reference voltage generating subunit 313 when the pulse signal generating unit 330 outputs a pulse signal of the fourth frequency. By such a setting, the power consumption of the puff detection unit 310 in the non-puffing state can be reduced, and the standby time can be further improved. In addition, in other embodiments of the present application, the enable end of one or two of the differential amplifier unit 311 , the voltage comparison unit 312 , and the reference voltage generation unit 313 may be connected to the output end of the pulse signal generation unit 330 .

[0101] In this embodiment, in the non-puffing state, the intermittent operation of at least some subunits of the puff detection unit 310 is synchronized with the intermittent conduction of the power supply control unit 120, that is, when the power supply control unit 120 is turned on, the puff detection unit 310 is working, and the state of the resistance bridge 200 can be detected at this time. When the power supply control unit 120 is disconnected, at least some subunits of the puff detection unit 310 do not work, and the state of the resistance bridge 200 cannot be detected at this time.

[0102] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0103] It should be understood that the "plurality" mentioned in this article refers to two or more. Those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present application are indicated by the following claims.

[0104] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0105] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. An airflow detection circuit, which is used to connect with a resistance bridge, characterized in that: include: System power supply terminal and system ground terminal, which are used to connect to the positive terminal and negative terminal of the power supply respectively; A voltage input terminal, which is used to receive the output voltage of the resistance bridge; A resistor power supply terminal, which is used to connect to a resistor bridge; A power supply control unit, which is connected to the system power supply terminal and / or the system ground terminal, and is also connected to the resistor power supply terminal, and is used to control whether the power supply supplies power to the resistor bridge; a suction detection control module connected to the voltage input terminal and used to determine the state of the resistance bridge according to the voltage received by the voltage input terminal; Among them, the puff detection control module is also connected to the power supply control unit. When the puff detection control module determines that the resistance bridge is in a non-puff state, the puff detection control module sequentially outputs pulse signals of multiple frequencies to the power supply control unit to control the power supply control unit to be intermittently turned on, so that the power supply intermittently supplies power to the resistance bridge, and as the non-puff state continues, the frequency of the pulse signal gradually decreases, so that the power supply time of the power supply to the resistance bridge per unit time is gradually shortened.

2. The airflow detection circuit according to claim 1, characterized in that: The puff detection control module includes a timing unit. When the puff detection control module determines that the resistance bridge enters a non-puff state from a puff state, the timing unit starts timing, and the puff detection control module outputs a pulse signal of a second frequency to the power supply control unit to control its intermittent conduction, so that the power supply intermittently supplies power to the resistance bridge. When the timing unit times to a first timing threshold, the puff detection control module outputs a pulse signal of a third frequency to the power supply control unit to control its intermittent conduction, and the third frequency is less than the second frequency. When the power supply control unit receives the pulse signal of the third frequency, the conduction time per unit time is shorter than the conduction time per unit time when the power supply control unit receives the pulse signal of the second frequency.

3. The airflow detection circuit according to claim 2, characterized in that: The puff detection control module also includes a puff detection unit and a pulse signal generating unit, wherein the puff detection unit is used to receive the output voltage of the resistance bridge, and the puff detection unit outputs a puff signal or a no-puff signal according to the received voltage, the timing unit is respectively connected to the puff detection unit and the pulse signal generating unit, and the pulse signal generating unit is connected to the power supply control unit, when the signal received by the timing unit changes from a puff signal to a no-puff signal, the timing unit starts timing, and the pulse signal generating unit generates a pulse signal of a second frequency and outputs it to the power supply control unit, and when the timing unit times to a first timing threshold, the pulse signal generating unit generates a pulse signal of a third frequency and outputs it to the power supply control unit.

4. The airflow detection circuit according to claim 3, characterized in that: The puff detection control module further includes a logic gate unit, two input ends of the logic gate unit are connected to the timing unit and the puff detection unit respectively, and an output end of the logic gate unit is connected to the pulse signal generating unit, when the signal output by the puff detection unit changes from a puff signal to a non-puff signal, the logic gate unit outputs a first intermediate signal to the pulse signal generating unit, and the pulse signal generating unit generates a pulse signal of a second frequency, when the timing unit times to a first timing threshold, the logic gate unit outputs a second intermediate signal to the pulse signal generating unit, and the pulse signal generating unit generates a pulse signal of a third frequency; or, When the signal received by the timing generating unit changes from a suction signal to a non-suction signal, the timing unit outputs a first intermediate signal to the pulse signal generating unit, and the pulse signal generating unit generates a pulse signal of a second frequency. When the timing unit times to a first timing threshold, the timing unit outputs a second intermediate signal to the pulse signal generating unit, and the pulse signal generating unit generates a pulse signal of a third frequency.

5. The airflow detection circuit according to claim 3, characterized in that: The pulse signal generating unit includes a first pulse generating subunit, a second pulse generating subunit and a selecting subunit, and the puff detection control module also includes a logic gate unit, wherein the first pulse generating subunit is used to generate a pulse signal of a second frequency, and the second pulse generating subunit is used to generate a pulse signal of a third frequency, and the selecting subunit is connected to the first pulse generating subunit and the second pulse generating subunit respectively, and the selecting subunit is also connected to the power supply control unit, and the selecting end of the selecting subunit is connected to the logic gate unit, and the two input ends of the logic gate unit are correspondingly connected to the timing unit and the puff detection unit, when the signal output by the puff detection unit changes from a puff signal to a non-puff signal, the logic gate unit outputs a first intermediate signal to the selecting subunit, and the selecting subunit selects the pulse signal of the second frequency to output, and when the timing unit times to a first timing threshold, the logic gate unit outputs a second intermediate signal to the selecting subunit, and the selecting subunit selects the pulse signal of the third frequency to output; or, The pulse signal generating unit includes a first pulse generating subunit, a second pulse generating subunit and a selecting subunit, and the logic pulse control unit also includes a logic gate unit, wherein the first pulse generating subunit is used to generate a pulse signal of a second frequency, and the second pulse generating subunit is used to generate a pulse signal of a third frequency, and the selecting subunit is connected to the first pulse generating subunit and the second pulse generating subunit respectively, and the selecting subunit is also connected to the power supply control unit, and the selecting end of the selecting subunit is connected to the timing unit, when the signal received by the timing generating unit changes from a suction signal to a non-suction signal, the timing unit outputs a first intermediate signal to the selecting subunit, and the selecting subunit selects the pulse signal of the second frequency to output, and when the timing unit times to a first timing threshold, the timing unit outputs a second intermediate signal to the selecting subunit, and the selecting subunit selects the pulse signal of the third frequency to output.

6. The airflow detection circuit according to claim 3, characterized in that: The puff detection unit includes a differential amplifier unit, a voltage comparison unit and a reference voltage generation unit, wherein the differential amplifier unit is used to receive the output voltage of the resistance bridge, the output end of the differential amplifier unit is connected to an input end of the voltage comparison unit, the other input end of the voltage comparison unit is connected to the reference voltage generation unit, the reference voltage generation unit is used to generate a second reference voltage, and the voltage comparison unit compares the voltages of the two input ends to output a puff signal or a no-puff signal.

7. The airflow detection circuit according to claim 1, characterized in that: The puff detection control module includes a puff detection unit and a logic pulse control unit, the puff detection unit is used to receive the output voltage of the resistance bridge, the puff detection unit outputs a puff signal or a no-puff signal according to the received voltage, the logic pulse control unit is connected to the puff detection unit, when the puff detection unit determines that the resistance bridge is in a no-puff state, the logic pulse control unit sequentially outputs pulse signals of multiple frequencies to the puff detection unit to control at least some subunits of the puff detection unit to work intermittently, and as the no-puff state continues, the frequency of the pulse signal gradually decreases, so that the working time of at least some subunits per unit time is shortened.

8. The airflow detection circuit according to claim 7, characterized in that: In the non-puffing state, at least part of the subunits of the puff detection unit intermittently work and the power supply control unit is intermittently turned on synchronously.

9. The airflow detection circuit according to any one of claims 1 to 8, characterized in that: The power supply control unit includes a first switch, one end of the first switch is connected to the system power supply end or the system ground end, the other end of the first switch is connected to the resistor power supply end, and the control end of the first switch is connected to the suction detection control module for receiving the pulse signal; or The power supply control unit includes a constant current source and a first switch, one end of the first switch is connected to the system power supply end or the system ground end, the other end of the first switch is connected to the resistor power supply end, the control end of the first switch is connected to the suction detection control module to receive the pulse signal, and the constant current source is connected in series with the first switch; or The power supply control unit includes a step-down voltage regulator unit, which is a low-voltage dropout linear regulator. The low-voltage dropout linear regulator includes an operational amplifier, a first sampling resistor, a second sampling resistor, and an adjustment tube, wherein the input end of the adjustment tube is used to be electrically connected to the positive end of the power supply, the output end of the adjustment tube is connected to the resistance bridge, the control end of the adjustment tube is electrically connected to the output end of the operational amplifier, the first end of the operational amplifier is connected to a first reference voltage, the second end of the operational amplifier is electrically connected to the first end of the second sampling resistor, the first end of the first sampling resistor is electrically connected to the output end of the adjustment tube, the second end of the first sampling resistor is electrically connected to the first end of the second sampling resistor, the second end of the second sampling resistor is electrically connected to the system ground end, and the enable end of the operational amplifier receives the pulse signal.

10. An airflow detection component, characterized in that: include: a resistance bridge configured such that the flow of airflow causes a change in resistance, and when the resistance bridge is powered, the resistance bridge is configured to cause a change in output voltage based on the change in resistance; The airflow detection circuit according to any one of claims 1 to 9, wherein the airflow detection circuit is connected to the resistance bridge.

11. An electronic atomization device, characterized in that: include: Power supply and heating elements; The airflow detection component as described in claim 10 or the airflow detection circuit as described in any one of claims 1-9, the airflow detection circuit also includes a power switch, the control end of the power switch is connected to the suction detection control module of the airflow detection circuit, one end of the power switch is connected to the power supply through the system power supply end or the system ground end, the other end of the power switch is connected to the heating element, and the other end of the heating element is connected to the power supply, when the suction detection control module determines that the resistance bridge is in the suction state, the suction detection control module controls the power switch to be normally turned on or intermittently turned on, and when the suction detection control module determines that the resistance bridge is in the non-suction state, the suction detection control module controls the power switch to remain disconnected.

12. An airflow detection chip, used to connect to a resistance bridge, characterized in that: include: System power pin and system ground pin, which are used to connect to the positive and negative terminals of the power supply; A voltage input pin for receiving the output voltage of the resistance bridge; A resistor power supply pin, which is used to connect to a resistor bridge; A power supply control unit, which is connected to the system power supply pin and / or the system ground pin, and is also connected to the resistor power supply pin, and is used to control whether the power supply supplies power to the resistor bridge; a puff detection control module connected to the voltage input pin and used to determine the state of the resistance bridge according to the voltage received by the voltage input pin; Among them, the puff detection control module is also connected to the power supply control unit. When the puff detection control module determines that the resistance bridge is in a non-puff state, the puff detection control module sequentially outputs pulse signals of multiple frequencies to the power supply control unit to control the power supply control unit to be intermittently turned on, so that the power supply intermittently supplies power to the resistance bridge, and as the non-puff state continues, the frequency of the pulse signal gradually decreases, so that the power supply time of the power supply to the resistance bridge per unit time is gradually shortened.

13. A control method for an airflow detection circuit, wherein the airflow detection circuit is used to be connected to a resistance bridge, characterized in that: The control method comprises: It is learned that the resistance bridge enters the unpumped state; triggering timing, and outputting a pulse signal of a second frequency to a power supply control unit, wherein the power supply control unit is used to control whether the power supply supplies power to the resistance bridge; Determine whether the timing duration reaches a first timing threshold; If the judgment result is yes, a pulse signal of a third frequency is output to the power supply control unit, wherein the length of time the power supply control unit is on per unit time when receiving the pulse signal of the third frequency is shorter than the length of time the power supply control unit is on per unit time when receiving the pulse signal of the second frequency.

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