Aerosol-generating device

Abstract

The utility model discloses an aerosol generating device. The aerosol generating device comprises a battery cell; a control unit; the first electrode end of the first switch circuit is electrically connected with the battery cell, and the second electrode end of the first switch circuit is electrically connected with the power supply port; when the first switching circuit is switched on, the battery cell supplies power to the control unit; the first control circuit is electrically connected with the input / output port and the control end of the first switching circuit; the control unit is configured to output a first signal to the first control circuit through the input and output port when the control unit works abnormally, so that the first control circuit controls the first switching circuit to be switched off, and power supply of the battery cell to the control unit is cut off. When the system works abnormally, the output of the voltage of the battery cell can be cut off in time, the safety and reliability of the aerosol generating device are ensured, and the use experience of a user is improved.

Description

Technical Field

[0001] The present application relates to the technical field of aerosol generation, and in particular to an aerosol generating device. Background Art

[0002] In the related art, there is an aerosol generating device that generates aerosol for users to inhale by heating rather than burning a solid aerosol-forming substrate, such as a cigarette stick. There is also another aerosol generating device that generates aerosol for users to inhale by heating a liquid aerosol-forming substrate, such as tobacco oil.

[0003] In the above device, if an abnormal situation occurs and the system freezes, it needs to be reset in time. In the prior art, the battery cells are usually removed or the buttons on the device are pressed to achieve the reset. However, the battery cells on the device are usually designed to be non-detachable. The button method requires adding buttons to the device and making holes in the device shell, which affects the product appearance and structural design and increases the cost. On the other hand, the battery cells are still supplying power when the system freezes, which poses a safety hazard. Utility Model Content

[0004] The present application provides an aerosol generating device, which can timely cut off the output of the battery cell voltage when the system operates abnormally, thereby ensuring the safety and reliability of the aerosol generating device.

[0005] The present application provides an aerosol generating device for heating an aerosol-forming substrate to generate an aerosol; the aerosol generating device comprises:

[0006] Battery cells, used to provide electricity;

[0007] A control unit having a power supply port and input and output ports;

[0008] a first switch circuit, wherein a first electrode end of the first switch circuit is electrically connected to the battery cell, and a second electrode end of the first switch circuit is electrically connected to the power supply port; when the first switch circuit is turned on, the battery cell supplies power to the control unit;

[0009] A first control circuit is electrically connected to the input / output port and a control end of the first switch circuit;

[0010] The control unit is configured to output a first signal to the first control circuit through the input / output port when operating abnormally, so that the first control circuit controls the first switch circuit to disconnect, thereby disconnecting the power supply from the battery cell to the control unit.

[0011] In one example, the aerosol generating device further includes a delay circuit electrically connected to the battery cell and the control end of the first switch circuit;

[0012] The delay circuit is configured to generate a first conduction voltage drop based on the cell voltage within a first preset time from the time when the cell charges the delay circuit, so as to control the first switch circuit to be turned on, so that the cell supplies power to the control unit;

[0013] The control unit is further configured to output a second signal to the first control circuit through the input / output port within the first preset time during normal operation, so that the first control circuit controls the first switch circuit to remain in an on state.

[0014] In one example, the delay circuit includes a first resistor and a first capacitor;

[0015] One end of the first resistor is electrically connected to the positive terminal of the battery cell, the other end of the first resistor is electrically connected to the control end of the first switch circuit and one end of the first capacitor, and the other end of the first capacitor is grounded.

[0016] In one example, the first switch circuit includes a first transistor, a first electrode terminal of the first transistor is electrically connected to the positive terminal of the battery cell, and a second electrode terminal of the first transistor is electrically connected to the positive power supply port of the control unit.

[0017] In one example, the first control circuit includes a voltage conversion circuit and a second switch circuit, a first electrode end of the second switch circuit is grounded, a second electrode end of the second switch circuit is electrically connected to a control end of the first switch circuit, and the control end of the second switch circuit is electrically connected to the input / output port through the voltage conversion circuit;

[0018] The voltage conversion circuit is configured to generate a turn-off voltage drop based on the first signal to control the second switch circuit to be turned off, thereby controlling the first switch circuit to be turned off.

[0019] In one example, the second switching circuit includes a second transistor, a first electrode terminal of the second transistor is grounded, a second electrode terminal of the second transistor is electrically connected to a control terminal of the first switching circuit, and the control terminal of the second transistor is electrically connected to the input-output port through the voltage conversion circuit.

[0020] In one example, the voltage conversion circuit includes a second capacitor, a second resistor, a first diode, a third capacitor, and a third resistor;

[0021] One end of the second capacitor is electrically connected to the input / output port, the other end of the second capacitor is electrically connected to the anode end of the first diode and one end of the second resistor, the other end of the second resistor is grounded, the cathode end of the first diode is electrically connected to the control end of the second switch circuit, one end of the third capacitor and one end of the third resistor are both electrically connected to the control end of the second switch circuit, and the other end of the third capacitor and the other end of the third resistor are both grounded.

[0022] In one example, the aerosol generating device further comprises:

[0023] A charging interface, the charging interface having a voltage output terminal, the voltage output terminal being configured to output a preset charging voltage when the charging interface is electrically connected to an external power source;

[0024] A second control circuit is electrically connected between the voltage output terminal and the control terminal of the second switch circuit; the second control circuit is configured to generate a second conduction voltage drop based on the charging voltage to control the conduction of the second switch circuit, and then control the first switch circuit to be turned on again, thereby activating the control unit.

[0025] In one example, the control unit is configured to output a second signal to the first control circuit through the input / output port within a second preset time when the second on-state voltage drop drops to the off-state voltage drop, so that the first control circuit controls the first switch circuit to remain in an on state.

[0026] In one example, the second control circuit includes a fourth resistor, a fourth capacitor, a fifth resistor and a second diode;

[0027] One end of the fourth capacitor is electrically connected to the voltage output end and one end of the fourth resistor, the other end of the fourth resistor is grounded, the other end of the fourth capacitor is electrically connected to the anode end of the second diode and one end of the fifth resistor, the other end of the fifth resistor is grounded, and the cathode end of the second diode is electrically connected to the control end of the second switching circuit.

[0028] The aerosol generating device provided above can cut off the output of the battery cell voltage in time when the system operates abnormally, thereby ensuring the safety and reliability of the aerosol generating device and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The realization of the purpose, functional features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. One or more embodiments are exemplarily described by the pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the drawings in the drawings do not constitute a scale limitation.

[0030] Figure 1 is a schematic diagram of an aerosol generating device provided in an embodiment of the present application;

[0031] Figure 2 is a schematic diagram of another aerosol generating device provided in an embodiment of the present application;

[0032] Figure 3 is a specific circuit diagram of the aerosol generating device provided in the embodiment of the present application;

[0033] Figure 4 This is a schematic diagram of the working waveform at the power-on moment provided in an embodiment of the present application;

[0034] Figure 5 This is a schematic diagram of the working waveform of PWM output after power-on provided by an embodiment of the present application;

[0035] Figure 6 This is a schematic diagram of the automatic power-off working waveform provided in an embodiment of the present application;

[0036] Figure 7 This is a schematic diagram of the working waveform of charging after automatic power-off provided in an embodiment of the present application;

[0037] Figure 8 This is a schematic diagram of a working waveform of PWM output when plugged in for charging provided by an embodiment of the present application;

[0038] Fig. 9 It is a schematic diagram of working waveforms when the control unit provided in an embodiment of the present application is working normally and the power adapter is unplugged and inserted;

[0039] Fig.10 It is a schematic diagram of a power-off protection method for an aerosol generating device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "upper", "lower", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0042] Figure 1 It is a schematic diagram of an aerosol generating device provided in an embodiment of the present application.

[0043] like Figure 1 As shown, the aerosol generating device includes a mouthpiece 11, a liquid storage unit 12, a liquid transfer unit 13, a heating element 14, a circuit 15, a battery cell 16, and a charging interface 17. Figure 1 In the example, the above components are formed in one piece, and the aerosol generating device is a common one-piece device. In another example, the aerosol generating device includes an atomizer and a power supply assembly detachably connected to the atomizer, the atomizer is usually also called a cigarette cartridge, and the power supply assembly is usually also called a cigarette rod; wherein the circuit 15, the battery cell 16 and the charging interface 17 are in the power supply assembly; the mouthpiece 11, the liquid storage unit 12, the liquid transfer unit 13, and the heating element 14 are in the atomizer.

[0044] The mouthpiece 11 is used for the user to inhale the aerosol generated by heating.

[0045] Liquid storage unit 12 is used to store the liquid aerosol that can generate aerosol and forms matrix.Liquid aerosol forms matrix and can be the liquid that comprises the tobacco-containing material that contains volatile tobacco flavor component, can also be the liquid that comprises non-tobacco material.For example, liquid aerosol forms matrix and can comprise water, solvent, ethanol, plant extract, spices, flavoring agent or vitamin mixture.Spice can comprise menthol, European mint, spearmint oil, various fruity fragrance components etc., but is not limited to this.Flavoring agent can comprise the composition that can provide multiple fragrance or local flavor to the user.Vitamin mixture can be for being mixed with at least a material in vitamin A, vitamin B, vitamin C and the vitamin E, but is not limited to this.In addition, liquid aerosol forms matrix and can comprise the aerosol forming agent as glycerine and propylene glycol.

[0046] The liquid transfer unit 13 can transfer the liquid aerosol-forming substrate stored in the liquid storage unit 12 to the heating element 14. For example, the liquid transfer unit 13 can be a porous material such as cotton fiber, ceramic fiber, glass fiber, or porous ceramic, porous glass, etc., but is not limited thereto. The liquid transfer unit 13 can be configured in a tubular shape, a plate shape, or other regular or irregular shapes.

[0047] The heating element 14 is a component for heating the liquid aerosol-forming substrate transferred through the liquid transfer unit 13. For example, the heating element 14 may be a metal wire, a metal plate, a ceramic heater, etc., but is not limited thereto. In addition, the heating element 14 may be composed of a conductive heating wire such as a nickel-chromium wire, and may be arranged in a structure wound around the liquid transfer unit 13. The heating element 14 may be heated by supplying an electric current, and transfers heat to the liquid aerosol-forming substrate in contact with the heating element 14 to heat the liquid aerosol-forming substrate, thereby generating an aerosol.

[0048] The circuit 15 can control the overall operation of the aerosol generating device. In detail, the circuit 15 controls not only the operation of the battery cell 16 and the heating element 14, but also the operation of other components in the aerosol generating device. In addition, the circuit 15 can determine whether the aerosol generating device can be operated by checking the status of the components of the aerosol generating device.

[0049] The circuit 15 comprises at least one control unit. The control unit may include, but is not limited to, a combination of a microcontroller and a memory for storing a program executable in the microcontroller, and the memory may be integrated in the microcontroller or independent of the microcontroller.

[0050] The battery cell 16 provides power for operating the aerosol generating device. For example, the battery cell 16 can provide power to heat the heating element 14, and can provide power required to operate the circuit 15. In addition, the battery cell 16 can provide power required to operate sensors, motors, etc. provided in the aerosol generating device.

[0051] The battery cell 16 may be, but is not limited to, a lithium iron phosphate (LiFePO4) battery cell. For example, the battery cell 16 may be a lithium cobalt oxide (LiCoO2) battery cell or a lithium titanate battery cell. The battery cell 16 may be a rechargeable battery cell.

[0052] The charging interface 17 has a voltage output terminal. The voltage output terminal is configured to output a charging voltage. Specifically, when the charging interface 17 is electrically connected to an external power source, for example, an external power adapter is inserted into the charging interface 17, the voltage output terminal of the charging interface 17 outputs a 5V charging voltage.

[0053] It should be noted that Figure 1 Only the components related to this embodiment are shown. A person skilled in the art will appreciate that the aerosol generating device may also include Figure 1 Other common components other than those shown.

[0054] For example, the aerosol generating device also includes a puff detector (not shown) for detecting the user's puff action and generating a corresponding electrical signal, such as detecting whether the aerosol generating device is puffed, the puff duration, the number of puffs, etc., so that the circuit 15, such as the control unit, controls the operation of the battery cell 16, the heating element 14, etc. according to the electrical signal, such as controlling the battery cell 16 to provide power to the heating element 14, so that the heating element 14 heats the atomized liquid aerosol to form a matrix. The puff detector can use a common pressure sensor, a differential pressure sensor, an airflow sensor, etc. When the aerosol generating device is puffed, the airflow enters through the charging port 17, flows through the battery cell 16, the circuit 15, the heating element 14, etc., and then flows out through the mouthpiece 11. The dotted arrow in the figure roughly shows the airflow path.

[0055] Figure 2 It is a schematic diagram of an aerosol generating device provided in an embodiment of the present application.

[0056] like Figure 2 As shown, the aerosol generating device comprises:

[0057] a chamber A in which an aerosol-generating article B is removably received;

[0058] The aerosol-generating product B preferably uses a solid aerosol-forming matrix, which may include one or more of powders, particles, fragments, strips or flakes of one or more of vanilla leaves, tobacco leaves, homogenized tobacco, and expanded tobacco; alternatively, the solid aerosol-forming matrix may contain additional tobacco or non-tobacco volatile flavor compounds to be released when the matrix is ​​heated.

[0059] The heating element 14 can be inserted into the aerosol generating product B for heating to generate aerosol when the aerosol generating product B is received in the chamber A. This method is generally referred to as central heating or internal heating.

[0060] It should be noted that the heating method of the heating element 14 includes but is not limited to resistance heating, electromagnetic heating, infrared heating, and air heating. The shape of the heating element 14 includes but is not limited to needle-shaped, pin-shaped, or thin sheet-shaped.

[0061] It should also be noted that Figure 2 Different from the examples, in other examples, the heating element 14 is configured to heat around at least a portion of the aerosol generating article B, which is commonly known as circumferential heating or peripheral heating, etc., which is also feasible.

[0062] The battery cell 16 is used for supplying power; the battery cell 16 may be a rechargeable battery cell.

[0063] The circuit 15 is used to control the aerosol generating device; for example, the circuit 15 controls the battery cell 16 to provide power to the heating element 14 .

[0064] The circuit 15 comprises a control unit. The control unit is a hardware component that controls the overall operation of the aerosol generating device. The control unit may be implemented as an array of multiple logic gates, or may be implemented as a combination of a microcontroller and a memory in which a program executable in the microcontroller is stored. It will be appreciated by those skilled in the art that the control unit may be implemented in other forms of hardware.

[0065] The charging interface 17 has a voltage output terminal. The voltage output terminal is configured to output a charging voltage. Specifically, when the charging interface 17 is electrically connected to an external power source, for example, an external power adapter is inserted into the charging interface 17, the voltage output terminal of the charging interface 17 outputs a 5V charging voltage.

[0066] Figure 3 It is a specific circuit diagram of the aerosol generating device provided in the embodiment of the present application.

[0067] like Figure 3 As shown, VCC+ is the positive terminal of the battery cell 16 , Vout is the positive power supply port of the control unit, MCU_IO is the input and output port of the control unit, and Vbus is the voltage output terminal of the charging interface 17 .

[0068] The aerosol generating device includes a first switching circuit, a first electrode end of the first switching circuit is electrically connected to the battery cell, and a second electrode end of the first switching circuit is electrically connected to a power supply port of a control unit; when the first switching circuit is turned on, the battery cell supplies power to the power supply port of the control unit.

[0069] In the example in the figure, the first switching circuit includes a first transistor Q1; the first electrode terminal of the first transistor Q1 is electrically connected to the positive terminal VCC+ of the battery cell 16, and the second electrode terminal of the first transistor Q1 is electrically connected to the positive power supply port Vout of the control unit.

[0070] In the figure, the first transistor Q1 is a PMOS tube, the source of the PMOS tube is the first electrode terminal of the first transistor Q1, the drain of the PMOS tube is the second electrode terminal of the first transistor Q1, and the gate of the PMOS tube is the control terminal of the first transistor Q1. It can be understood that the first transistor Q1 can also be other transistors.

[0071] The aerosol generating device comprises a first control circuit electrically connected to the input and output ports of the control unit and the control end of the first switch circuit.

[0072] Wherein, the control unit is configured to output a first signal to the first control circuit through the input and output ports of the control unit when operating abnormally, so that the first control circuit controls the first switch circuit to disconnect, thereby disconnecting the power supply of the battery cell to the control unit.

[0073] In one example, the first control circuit includes a voltage conversion circuit and a second switch circuit, a first electrode end of the second switch circuit is grounded, a second electrode end of the second switch circuit is electrically connected to a control end of the first switch circuit, and the control end of the second switch circuit is electrically connected to the input / output port through the voltage conversion circuit;

[0074] The voltage conversion circuit is configured to generate a turn-off voltage drop based on the first signal to control the second switch circuit to be turned off, thereby controlling the first switch circuit to be turned off.

[0075] In the example in the figure, the second switching circuit includes a second transistor Q2, a first electrode terminal of the second transistor Q2 is grounded, a second electrode terminal of the second transistor Q2 is electrically connected to a control terminal of the first switching circuit, and the control terminal of the second transistor Q2 is electrically connected to the input-output port through the voltage conversion circuit.

[0076] In the figure, the second transistor Q2 is an NMOS tube, the source of the NMOS tube is the first electrode terminal of the second transistor Q2, the drain of the NMOS tube is the second electrode terminal of the second transistor Q2, and the gate of the NMOS tube is the control terminal of the second transistor Q2. It is understandable that the second transistor Q2 can also be other transistors.

[0077] In the example in the figure, the voltage conversion circuit includes a second capacitor C3, a second resistor R12, a first diode D3, a third capacitor C5 and a third resistor R5;

[0078] One end of the second capacitor C3 is electrically connected to the input / output port, the other end of the second capacitor C3 is electrically connected to the anode end of the first diode D3 and one end of the second resistor R12, the other end of the second resistor R12 is grounded, the cathode end of the first diode D3 is electrically connected to the control end of the second switch circuit (i.e., the gate of the NMOS tube), one end of the third capacitor C5 and one end of the third resistor R5 are both electrically connected to the control end of the second switch circuit, and the other end of the third capacitor C5 and the other end of the third resistor R5 are both grounded.

[0079] In one example, the aerosol generating device further includes a delay circuit electrically connected to the battery cell and the control end of the first switch circuit;

[0080] The delay circuit is configured to generate a first conduction voltage drop based on the cell voltage within a first preset time from the time when the cell charges the delay circuit, so as to control the first switch circuit to be turned on, so that the cell supplies power to the control unit;

[0081] The control unit is further configured to output a second signal to the first control circuit through the input / output port within the first preset time during normal operation, so that the first control circuit controls the first switch circuit to remain in an on state.

[0082] In the example in the figure, the delay circuit includes a first resistor R1 and a first capacitor C4;

[0083] One end of the first resistor R1 is electrically connected to the positive terminal of the battery cell, the other end of the first resistor R1 is electrically connected to the control end of the first switch circuit and one end of the first capacitor C4, and the other end of the first capacitor C4 is grounded.

[0084] In one example, the aerosol generating device further comprises a second control circuit;

[0085] The second control circuit is electrically connected between the voltage output terminal and the control terminal of the second switch circuit; the second control circuit is configured to generate a second conduction voltage drop based on the charging voltage to control the conduction of the second switch circuit, and then control the first switch circuit to be turned on again, thereby activating the control unit.

[0086] Further, the control unit is configured to output a second signal to the first control circuit through the input / output port within a second preset time when the second on-state voltage drop drops to the off-state voltage drop, so that the first control circuit controls the first switch circuit to remain in an on state.

[0087] In the example in the figure, the second control circuit includes a fourth resistor R4, a fourth capacitor C1, a fifth resistor R11 and a second diode D2;

[0088] One end of the fourth capacitor C1 is electrically connected to the voltage output end and one end of the fourth resistor R4, the other end of the fourth resistor R4 is grounded, the other end of the fourth capacitor C1 is electrically connected to the anode end of the second diode D2 and one end of the fifth resistor R11, the other end of the fifth resistor R11 is grounded, and the cathode end of the second diode D2 is electrically connected to the control end of the second switch circuit.

[0089] The following combination Figure 4-Figure 9 right Figure 3 The working process is described as follows:

[0090] Assume that the cell voltage is VCC=4V, the on-threshold voltage of the PMOS tube Q1 is Vgs1(th)=-1.2V, the on-threshold voltage of the NMOS tube Q2 is Vgs2(th)=0.7V, and the on-voltage drops of the diodes D2 and D3 are both 0.5V.

[0091] 1. When the system is powered on:

[0092] When the system is powered on, the external power adapter is not plugged into the charging interface 17, and the input / output port MCU_IO of the control unit has no output.

[0093] Please combine Figure 4 It can be understood that due to the existence of resistor R5, the gate of NMOS tube Q2 is pulled down to a low level, so that the source and drain of NMOS tube Q2 are not conductive. The cell voltage VCC charges capacitor C4 through resistor R1, and the voltage of capacitor C4, namely Vg1, increases from 0V.

[0094] When Vgs1=Vg1-4 is less than or equal to -1.2V, that is, when Vg1 increases from 0 to 2.8V (the corresponding time is recorded as Ton), the source and drain of the PMOS tube Q1 are in the on state, and the battery cell voltage VCC supplies power to the control unit, so that the system can power on and work normally.

[0095] When Vgs1=Vg1-4 is greater than -1.2V, that is, when Vg1 increases from 2.8V to 4V, the source and drain of the PMOS tube Q1 are in a disconnected state, and the cell voltage cannot supply power to the control unit.

[0096] Please combine Figure 5 It can be understood that during the Ton time, when the cell voltage VCC supplies power to the control unit so that the system is powered on and working normally, if the control unit outputs a pulse modulated square wave of a certain frequency (for example, 100Hz) through the input and output port MCU_IO, the pulse modulated square wave passes through the capacitor C3 and is filtered by the diode D3 and the capacitor C5 to obtain an approximate DC high level (Vg2 is greater than 0.7V), thereby making the source and drain of the NMOS tube Q2 conductive, and the Vg1 voltage drops from VCC to approximately 0V, thereby making the source and drain of the PMOS tube Q1 conductive, and the cell voltage VCC continues to power the control unit.

[0097] exist Figure 4-Figure 5 In the circuit, the Ton time is determined by the resistor R1 and the capacitor C4. The Ton time can be changed by adjusting the resistor R1 and the capacitor C4. The value of Ton can be estimated based on the capacitor charge and discharge formula t = RC*Ln[(V1-V0) / (V1-Vt)] (V0 is the initial voltage value on the capacitor, V1 is the voltage value that the capacitor can eventually charge or discharge, Vt is the voltage value on the capacitor at time t, R is the resistor, and C is the capacitor). Generally, Ton can be set to more than 100ms.

[0098] 2. Automatic power off:

[0099] Depend on Figure 5 It can be seen that when the cell voltage VCC supplies power to the control unit so that the system is powered on and working normally, the control unit outputs a pulse modulated square wave of a certain frequency (for example, 100 Hz) through the input and output port MCU_IO, so that the cell voltage VCC continues to supply power to the control unit.

[0100] Please combine Figure 6 Understand that in subsequent work, if the system is abnormal, such as the control unit crashes. At this time, the signal output by the control unit through the input and output port MCU_IO may be low or high ( Figure 6 Assumed to be low level in the figure), but it is definitely not the aforementioned pulse modulated square wave. Therefore, the output of the input / output port MCU_IO cannot pass through the capacitor C3, and Vg2 is pulled down to a low level again through the resistor R5, so that the source and drain of the NMOS tube Q2 are not conducting, and the voltage of Vg1 begins to rise to VCC, so that the source and drain of the PMOS tube Q1 are in a disconnected state (the dotted line in the figure is the moment when the PMOS tube Q1 begins to enter the disconnected state), and the cell voltage VCC cannot supply power to the control unit, the control unit is powered off for protection, and all work stops until the control unit is activated.

[0101] 3. Activation work:

[0102] After the power is automatically turned off, if the external power adapter is inserted into the charging interface 17 to charge the battery, the voltage output end of the charging interface 17 outputs a charging voltage of 5V, that is, VI is 5V. VI gives Vg2 a high level (VI-0.5)V through capacitor C1 and diode D2, so that the source and drain of the NMOS tube Q2 are connected, and the Vg1 voltage drops to approximately 0V, so that the source and drain of the PMOS tube Q1 are in a conductive state. The battery cell voltage VCC supplies power to the control unit again, and the control system is activated and starts working.

[0103] The time period from when Vg2 discharges from the initial high level (VI-0.5)V to 0.7V is recorded as Tch.

[0104] Please combine Figure 7 To understand, if the control unit starts working within the Tch time but does not output a pulse modulated square wave of a certain frequency (for example, 100Hz) through the input and output port MCU_IO. When Vg2 is discharged from the initial high level (VI-0.5)V to below 0.7V, the source and drain of the NMOS tube Q2 are not conducting, and the Vg1 voltage begins to rise to VCC, so that the source and drain of the PMOS tube Q1 are disconnected, and the cell voltage cannot power the control unit.

[0105] Please combine Figure 8 To understand, if the control unit starts working within the Tch time and outputs a pulse modulated square wave of a certain frequency (for example, 100Hz) through the input and output port MCU_IO, the pulse modulated square wave passes through the capacitor C3 and is filtered by the diode D3 and the capacitor C5 to obtain an approximate DC high level (Vg2 greater than 0.7V), so that the source and drain of the NMOS tube Q2 remain in a conductive state, and then the source and drain of the PMOS tube Q1 remain in a conductive state, and the cell voltage VCC continuously supplies power to the control unit.

[0106] Tch is determined by the discharge time of resistor R5 and capacitor C1. Adjusting the size of resistor R5 and capacitor C1 can change the length of Tch. The value of Tch can be estimated based on the capacitor charge and discharge formula t=RC*Ln[(V1-V0) / (V1-Vt)] (V0 is the initial voltage value on the capacitor, V1 is the voltage value that the capacitor can eventually charge or discharge, Vt is the voltage value on the capacitor at time t, R is the resistor, and C is the capacitor). Generally, Tch can be set to more than 100ms.

[0107] Please combine Fig. 9It is understood that since the control unit continuously outputs a pulse modulated square wave through the input and output port MCU_IO, unplugging the power adapter from the charging interface 17 or plugging the power adapter into the charging interface 17 does not affect the power supply of the battery cell voltage VCC to the control unit.

[0108] The charging activation effect is only effective when the system is abnormal, and is invalid at other times, preventing unpleasant experiences such as power outages. After the control unit is powered on, it can be initialized and started from the fixed address of the control unit's memory, without memorizing and continuing the previous operation. Re-powering on will not cause any impact on the aerosol generating device.

[0109] The following describes the power-off protection method provided by some embodiments of the present application in combination with the exemplary application and implementation of the aerosol generating device provided by the embodiments of the present application. Fig.10 , Fig.10 It is a flowchart of the power-off protection method provided in some embodiments of the present application.

[0110] like Fig.10 As shown, the power-off protection method may specifically include the following steps:

[0111] S11, the first switch circuit is turned on, so that the battery cell supplies power to the control unit;

[0112] S12. When the control unit operates abnormally, the control unit outputs a first signal to the first control circuit, so that the first control circuit controls the first switch circuit to be disconnected, thereby disconnecting the power supply from the battery cell to the control unit.

[0113] In one example, the delay circuit controls the first switch circuit to be turned on within a first preset time, so that the battery cell supplies power to the control unit.

[0114] In one example, when the control unit works normally, it outputs a second signal to the first control circuit within the first preset time, so that the first control circuit controls the first switch circuit to remain in the on state.

[0115] In one example, the charging interface is electrically connected to an external power source, so that the second control circuit controls the second switch circuit to be turned on, and then controls the first switch circuit to be turned on again, thereby activating the control unit.

[0116] In one example, the control unit outputs a second signal to the first control circuit within a second preset time, so that the first control circuit controls the first switch circuit to remain in a conducting state.

[0117] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional limitations on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present application; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present application.

Claims

1. An aerosol generating device for heating an aerosol-forming substrate to generate an aerosol; characterized in that: The aerosol generating device comprises: Battery cells, used to provide electricity; A control unit having a power supply port and input and output ports; a first switch circuit, wherein a first electrode end of the first switch circuit is electrically connected to the battery cell, and a second electrode end of the first switch circuit is electrically connected to the power supply port; when the first switch circuit is turned on, the battery cell supplies power to the control unit; A first control circuit is electrically connected to the input / output port and a control end of the first switch circuit; The control unit is configured to output a first signal to the first control circuit through the input / output port when operating abnormally, so that the first control circuit controls the first switch circuit to disconnect, thereby disconnecting the power supply from the battery cell to the control unit.

2. The aerosol generating device according to claim 1, characterized in that: The aerosol generating device further comprises a delay circuit electrically connected to the battery cell and the control end of the first switch circuit; The delay circuit is configured to generate a first conduction voltage drop based on the cell voltage within a first preset time from the time when the cell charges the delay circuit, so as to control the first switch circuit to be turned on, so that the cell supplies power to the control unit; The control unit is further configured to output a second signal to the first control circuit through the input / output port within the first preset time during normal operation, so that the first control circuit controls the first switch circuit to remain in an on state.

3. The aerosol generating device according to claim 2, characterized in that: The delay circuit includes a first resistor and a first capacitor; One end of the first resistor is electrically connected to the positive terminal of the battery cell, the other end of the first resistor is electrically connected to the control end of the first switch circuit and one end of the first capacitor, and the other end of the first capacitor is grounded.

4. The aerosol generating device according to claim 1, characterized in that: The first switch circuit includes a first transistor, a first electrode terminal of the first transistor is electrically connected to the positive terminal of the battery cell, and a second electrode terminal of the first transistor is electrically connected to the positive power supply port of the control unit.

5. The aerosol generating device according to claim 1, characterized in that: The first control circuit includes a voltage conversion circuit and a second switch circuit, the first electrode end of the second switch circuit is grounded, the second electrode end of the second switch circuit is electrically connected to the control end of the first switch circuit, and the control end of the second switch circuit is electrically connected to the input / output port through the voltage conversion circuit; The voltage conversion circuit is configured to generate a turn-off voltage drop based on the first signal to control the second switch circuit to be turned off, thereby controlling the first switch circuit to be turned off.

6. The aerosol generating device according to claim 5, characterized in that: The second switch circuit includes a second transistor, a first electrode terminal of the second transistor is grounded, a second electrode terminal of the second transistor is electrically connected to a control terminal of the first switch circuit, and the control terminal of the second transistor is electrically connected to the input / output port through the voltage conversion circuit.

7. The aerosol generating device according to claim 5, characterized in that: The voltage conversion circuit includes a second capacitor, a second resistor, a first diode, a third capacitor and a third resistor; One end of the second capacitor is electrically connected to the input / output port, the other end of the second capacitor is electrically connected to the anode end of the first diode and one end of the second resistor, the other end of the second resistor is grounded, the cathode end of the first diode is electrically connected to the control end of the second switch circuit, one end of the third capacitor and one end of the third resistor are both electrically connected to the control end of the second switch circuit, and the other end of the third capacitor and the other end of the third resistor are both grounded.

8. The aerosol generating device according to claim 5, characterized in that: The aerosol generating device further comprises: A charging interface, the charging interface having a voltage output terminal, the voltage output terminal being configured to output a preset charging voltage when the charging interface is electrically connected to an external power source; A second control circuit is electrically connected between the voltage output terminal and the control terminal of the second switch circuit; the second control circuit is configured to generate a second conduction voltage drop based on the charging voltage to control the conduction of the second switch circuit, and then control the first switch circuit to be turned on again, thereby activating the control unit.

9. The aerosol generating device according to claim 8, characterized in that: The control unit is configured to output a second signal to the first control circuit through the input / output port within a second preset time when the second on-state voltage drop decreases to the off-state voltage drop, so that the first control circuit controls the first switch circuit to remain in an on state.

10. The aerosol generating device according to claim 8, characterized in that The second control circuit includes a fourth resistor, a fourth capacitor, a fifth resistor and a second diode; One end of the fourth capacitor is electrically connected to the voltage output end and one end of the fourth resistor, the other end of the fourth resistor is grounded, the other end of the fourth capacitor is electrically connected to the anode end of the second diode and one end of the fifth resistor, the other end of the fifth resistor is grounded, and the cathode end of the second diode is electrically connected to the control end of the second switching circuit.

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