Aerosol-generating device

Abstract

The utility model provides an aerosol generating device. The aerosol generating device comprises a battery cell; a heating element; the boost converter has a direct connection mode and a boost mode and comprises a voltage input pin, a voltage output pin and a feedback pin; the voltage division circuit comprises a first voltage division unit, a second voltage division unit and a first switching circuit; the control unit is configured to control the first switching circuit to be switched on, so that the boost converter enters a boost mode; and the controller is further configured to control the first switching circuit to be switched off, so that the boost converter enters a direct-through mode. According to the aerosol generation device provided by the invention, the boost converter enters the boost mode or the direct connection mode by controlling the on or off of the switching circuit in the voltage division circuit; in this way, boosting of the boost converter can be started according to actual requirements, and the problems of high energy consumption and shortening of the service life of a battery caused by long-term starting of the boost converter are avoided.

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] As an example, 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. As another example, there is another aerosol generating device that generates aerosol for users to inhale by heating a liquid aerosol-forming substrate, such as a cigarette oil.

[0003] The above-mentioned aerosol generating device is usually provided with a boost circuit, which increases the cell voltage to a certain fixed voltage to increase the output power; then the control unit adjusts the duty cycle of the pulse signal, thereby adjusting the heating power of the heating element to achieve temperature control of the heating element.

[0004] The problems with this device are that the output voltage of the boost circuit is relatively high, and the output peak current is relatively large. Long-term high-current output will shorten the battery life; the boost circuit works in a switching state, and the inductor and high-frequency switching tube consume more energy and have a relatively low energy efficiency; the ripple voltage at the output end of the boost circuit is relatively large, and when measuring the output voltage and current, the data is unstable, which is not conducive to accurate measurement and control. Utility Model Content

[0005] The present application provides an aerosol generating device to solve at least one of the above-mentioned technical problems.

[0006] The present application provides an aerosol generating device, comprising:

[0007] Battery cells, used to provide electricity;

[0008] a heating element for heating the aerosol-forming substrate to generate an aerosol;

[0009] A boost converter having a pass-through mode and a boost mode, the boost converter comprising a voltage input pin electrically connected to the battery cell, a voltage output pin electrically connected to the heating element, and a feedback pin;

[0010] A voltage dividing circuit, comprising a first voltage dividing unit electrically connected between the voltage output pin and the feedback pin, a second voltage dividing unit electrically connected between the feedback pin and ground, and a first switch circuit connected in parallel with the second voltage dividing unit;

[0011] A control unit is configured to control the first switch circuit to be turned on so that the boost converter enters a boost mode, so that the boost converter performs a boost conversion on the cell voltage inputted from the voltage input pin and outputs the voltage to the heating element through the voltage output pin; and is also configured to control the first switch circuit to be turned off so that the boost converter enters a pass-through mode, so that the boost converter outputs the cell voltage inputted from the voltage input pin directly to the heating element through the voltage output pin.

[0012] In one example, the boost converter further includes an enable pin;

[0013] The control unit is configured to output an enable control signal to the enable pin to start the boost converter.

[0014] In one example, the control unit is configured to output the enable control signal to the enable pin when receiving a heating start instruction.

[0015] In one example, the control unit is configured to control the first switch circuit to be turned on when the heating element is in a heating stage and / or a heat preservation stage; and to control the first switch circuit to be turned off when the heating element is in a suction stage.

[0016] In one example, the control unit is configured to control the first switch circuit to be turned on during a period when the heating element is heated from an initial temperature to a target temperature; and to control the first switch circuit to be turned off when the heating element is heated to the target temperature.

[0017] In one example, a second switch circuit is further included, the second switch circuit is electrically connected between the boost converter and the heating element or between the heating element and ground;

[0018] The control unit is configured to output a heating control signal to the second switching circuit to control heating energy output to the heating element based on the voltage output from the voltage output pin.

[0019] In one example, a detection circuit is further included which is electrically connected between the second switch circuit and the heating element, and the detection circuit is used to detect an electrical parameter output to the heating element;

[0020] The control unit is configured to obtain the electrical parameter detected by the detection circuit, and adjust the heating control signal output to the second switch circuit based on the electrical parameter.

[0021] In one example, the detection circuit includes at least one of a voltage detection circuit and a current detection circuit, the voltage detection circuit is used to detect a voltage output to the heating element, and the current detection circuit is used to detect a current output to the heating element.

[0022] In one example, the second switch circuit includes a first switch tube and a second switch tube;

[0023] The first electrode end of the first switch tube is electrically connected to the control end of the second switch tube, the second electrode end of the first switch tube is grounded, and the control end of the first switch tube is used to receive the heating control signal; the first electrode end of the second switch tube is electrically connected to the boost converter, and the second electrode end of the second switch tube is electrically connected to the heating element.

[0024] In one example, it also includes an input filter unit and an output filter unit;

[0025] The input filter unit is electrically connected between the battery cell and the voltage input pin, and the output filter unit is electrically connected between the voltage output pin and the heating element.

[0026] In one example, the first switch circuit includes a third switch tube and a resistor connected in series.

[0027] The aerosol generating device provided in the present application controls the conduction or disconnection of the switch circuit in the voltage divider circuit to enable the boost converter to enter the boost mode or the pass-through mode; in this way, the boost of the boost converter can be started according to actual needs, thereby avoiding the problem of high energy consumption and shortened battery life caused by long-term startup of the boost converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] One or more embodiments are exemplarily described by 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 figures in the drawings do not constitute proportional limitations.

[0029] Figure 1 is a schematic diagram of an aerosol generating device provided in an embodiment of the present application;

[0030] Figure 2 is a schematic diagram of another aerosol generating device provided in an embodiment of the present application;

[0031] Figure 3 is a schematic diagram of a heating curve of a heating element provided in an embodiment of the present application;

[0032] Figure 4 It is a circuit block diagram provided by an embodiment of the present application;

[0033] Figure 5 It is a specific circuit schematic diagram provided by the implementation method of this application;

[0034] Figure 6 is another specific circuit schematic diagram provided by an embodiment of the present application;

[0035] Figure 7 It is a schematic diagram of a control method for an aerosol generating device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] Figure 1 It is a schematic diagram of an aerosol generating device provided in an embodiment of the present application.

[0039] like Figure 1 As shown, the aerosol generating device comprises 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 puff detector 17 .

[0040] exist 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 puff detector 17 are arranged in the power supply assembly; the mouthpiece 11, the liquid storage unit 12, the liquid transfer unit 13, and the heating element 14 are arranged in the atomizer.

[0041] The mouthpiece 11 is used for the user to inhale the aerosol generated by heating.

[0042] The liquid storage unit 12 is used to store a liquid aerosol-forming substrate capable of generating an aerosol.

[0043] The liquid aerosol-forming substrate can be a liquid substrate comprising a tobacco-containing substance containing volatile tobacco flavor components, or a liquid substrate comprising a non-tobacco substance. Generally, the liquid aerosol-forming substrate comprises aerosol-forming agents such as glycerol and propylene glycol.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] The circuit 15 includes at least one control unit. The control unit may include a logic gate array, or may include a combination of a microcontroller and a memory storing a program executable in the microcontroller. In addition, those skilled in the art will appreciate that the circuit 15 may include another type of hardware.

[0048] The battery cell 16 provides power for operating the aerosol generating device 10. 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.

[0049] The battery cell 16 may be, but is not limited to, a lithium iron phosphate (LiFePO4) battery cell, a lithium cobalt oxide (LiCoO2) battery cell, or a lithium titanate battery cell. The battery cell 16 may be a rechargeable battery cell or a disposable battery cell.

[0050] The puff detector 17 is used to detect the user's puffing action and generate a corresponding electrical signal, that is, to detect whether the aerosol generating device is puffed, so that the circuit 15, such as the control unit, controls the operation of the battery 16, the heating element 14, etc. according to the electrical signal, for example, controls the battery 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 17 can be a common pressure sensor, a pressure difference sensor, an airflow sensor, etc.

[0051] An air inlet is provided at a position of the aerosol generating device adjacent to the puff detector 17. When the aerosol generating device is puffed, air flows in through the air inlet, flows through the puff detector 17, the battery cell 16, the circuit 15, the heating element 14, etc., and then flows out through the nozzle 11. The dotted arrow in the figure roughly shows the airflow path.

[0052] 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.

[0053] Figure 2 It is a schematic diagram of another aerosol generating device provided in an embodiment of the present application.

[0054] like Figure 2 As shown, the aerosol generating device comprises:

[0055] a chamber A in which an aerosol-generating article B is removably received;

[0056] 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.

[0057] The heating element 14 can be inserted into the aerosol generating product B to heat the aerosol generating product B when the aerosol generating product B is received in the chamber A to generate aerosol.

[0058] It should be noted that the heating method of the heating element 14 includes but is not limited to resistance heating, electromagnetic induction heating, infrared radiation 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.

[0059] It should also be noted that Figure 2Different 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.

[0060] The battery cell 16 provides power for operating the aerosol generating device. The battery cell 16 may be a rechargeable battery cell or a disposable battery cell.

[0061] 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 .

[0062] The circuit 15 includes a control unit. The control unit is configured as a hardware component that controls the overall operation of the aerosol generating device. The control unit can be implemented as an array of multiple logic gates, or can be implemented as a combination of a microcontroller and a memory, in which a program executable in the microcontroller is stored. It will be understood by those skilled in the art that it can be implemented in other forms of hardware.

[0063] Figure 3 It is a schematic diagram of a heating curve of a heating element provided in an embodiment of the present application.

[0064] like Figure 3 As shown, the temperature variation curve of the heating element 14 over time (the horizontal axis is time, the vertical axis is temperature) includes a heating stage t0-t1, a heat preservation stage t1-t2 and a suction stage t2-t3.

[0065] In the temperature rising stage t0-t1, the temperature of the heating element 14 rises from the initial temperature T0 (or the ambient temperature) to the target temperature T1. Generally, the target temperature T1 may be 200°C-400°C.

[0066] In the heat preservation stage t1-t2, the temperature of the heating element 14 is kept at the target temperature T1 for a period of time, so that the aerosol-forming matrix is ​​fully preheated to improve the user's puffing taste.

[0067] The above-mentioned heating stage and heat preservation stage are collectively referred to as the preheating stage, and t0-t2 is the preheating time of the heating element 14. Figure 2 In the aerosol generating device shown, the preheating time of the heating element 14 is 5 seconds to 30 seconds.

[0068] In the inhalation stage t2-t3, the temperature of the heating element 14 drops from the target temperature T1 to the target temperature T2, and the target temperature T2 is the optimal temperature for the aerosol-forming substrate to generate aerosol. In this stage, the temperature of the heating element 14 is generally maintained at the target temperature T2 or fluctuates around the target temperature T2, and t2-t3 is the holding time.

[0069] It should be noted that the heating curve of the heating element 14 is not limited to Figure 3 In other examples, it is also feasible that the heating curve of the heating element 14 only has a temperature rise phase and a suction phase.

[0070] Figure 4 It is a circuit block diagram provided in an embodiment of the present application.

[0071] like Figure 4 As shown, the circuit 15 includes a control unit 151, a boost circuit 152 and a switch circuit 153 (a second switch circuit).

[0072] The control unit 151 is electrically connected to the heating element 14. The control unit 151 can obtain the temperature information of the heating element 14 detected by the temperature detection unit through the temperature detection unit (not shown in the figure). The temperature detection unit is not limited here, and can be a temperature sensor device such as a thermocouple, an NTC thermistor (Negative Temperature Coefficient, negative temperature coefficient thermistor) or a PTC thermistor (Positive Temperature Coefficient, positive temperature coefficient thermistor) to measure the temperature information of the heating element 14.

[0073] The boost circuit 152 is electrically connected to the battery cell 16 and the switch circuit 153, and the switch circuit 153 is electrically connected between the boost circuit 152 and the heating element 14. The boost circuit 152 and the switch circuit 153 can be referred to Figure 5-Figure 6 .

[0074] like Figure 5-Figure 6 As shown, in one example, the boost circuit 152 includes a boost converter U1 and a voltage divider circuit.

[0075] The boost converter U1 includes a voltage input pin VIN, a voltage output pin VOUT and a feedback pin FB.

[0076] The voltage divider circuit includes a first voltage divider unit electrically connected between a voltage output pin VOUT and a feedback pin FB, a second voltage divider unit electrically connected between the feedback pin FB and ground, and a first switch circuit connected in parallel with the second voltage divider unit, wherein the first switch circuit includes a third switch tube and a resistor connected in series.

[0077] Specifically, the first voltage dividing unit includes a resistor R5, the second voltage dividing unit includes a resistor R4, and the first switch circuit includes a third switch tube Q1 and a resistor R6 connected in series. One end of the resistor R5 is electrically connected to the voltage output pin VOUT, the other end of the resistor R5 is electrically connected to one end of the resistor R4, one end of the resistor R6 and the feedback pin FB, the other end of the resistor R4 is grounded, the other end of the resistor R6 is electrically connected to the first electrode end of the third switch tube Q1, the second electrode end of the third switch tube Q1 is grounded, the control end of the third switch tube Q1 is used to receive a control signal of the control unit 151 (refer to HIGH_VLO_EN in the figure), and the control end of the third switch tube Q1 is grounded through the pull-down resistor R7 to prevent the third switch tube Q1 from being malfunctioning. Among them, the third switch tube Q1 can be a metal-oxide-semiconductor field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), a bipolar junction transistor (Bipolar Junction Transistor, BJT), an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) or a thyristor, and is not limited to the listed types.

[0078] Continue to refer Figure 5 As shown, the boost converter U1 also has a self-boost pin BST, a switch control pin SW, an enable pin EN, a mode selection pin MODE, a chip power supply pin VDD, a soft start pin SS, an analog ground pin AGND, a power ground pin PGND, a fault signal pin FTY and a compensation pin COMP.

[0079] Among them, an input inductor L1 can be connected between the voltage input pin VIN and the switch control pin SW. A bootstrap capacitor C7 can be connected between the switch control pin SW and the self-boosting pin BST. The compensation pin COMP is grounded through the compensation capacitor C8 and the compensation resistor R3 in turn, and phase compensation is achieved by appropriately adjusting the capacitance value of the compensation capacitor C8 and the resistance value of the compensation resistor R3 to avoid problems with the frequency domain response. The fault signal pin FTY is grounded. The soft start pin SS can be grounded through the soft start capacitor C6 to help adjust the soft start time. The chip power supply pin VDD can be grounded through the filter capacitor C5 to help provide a stable power supply voltage. The mode selection pin MODE is electrically connected to the filter capacitor C5 through the resistor R2. The enable pin EN receives the enable control signal of the control unit 151 (shown as POW_EN in the figure), thereby starting the boost converter U1. The enable pin EN is grounded through the pull-down resistor R1 to prevent the boost converter U1 from being malfunctioning.

[0080] Furthermore, the boost circuit 152 may also include an input filter unit and an output filter unit.

[0081] The input filter unit may be electrically connected between the battery cell 16 and the voltage input pin VIN, and the output filter unit may be electrically connected between the voltage output pin VOUT and the heating element 14, respectively for filtering the input voltage and the output voltage to improve the voltage waveform.

[0082] Specifically, the input filter unit may be composed of four capacitors C1, C2, C3 and C4 connected in parallel. One end of the above-mentioned capacitors C1, C2, C3 and C4 are electrically connected between the battery cell 16 and the voltage input pin VIN, and the other end is grounded. The output filter unit may be composed of four capacitors C9, C10, C11 and C12 connected in parallel. One end of the above-mentioned capacitors C9, C10, C11 and C12 are electrically connected between the voltage output pin VOUT and the heating element 14, and the other end is grounded.

[0083] like Figure 6 As shown, the switch circuit 153 is electrically connected between the boost converter U1 and the heating element 14 (the heating element 14 is arranged between OUT+ and OUT-). Specifically, the switch circuit 153 includes a first switch tube Q2 and a second switch tube Q3; the first electrode end of the first switch tube Q2 is electrically connected to the control end of the second switch tube Q3, the second electrode end of the first switch tube Q2 is grounded, and the control end of the first switch tube Q2 is used to receive the heating control signal of the control unit 151; the first electrode end of the second switch tube Q3 is electrically connected to the boost converter U1 (as shown by V+ in the reference figure), and the second electrode end of the second switch tube Q3 is electrically connected to the heating element 14.

[0084] Similar to the above, the first switch tube Q2 or the second switch tube Q3 can be a metal-oxide-semiconductor field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), a bipolar junction transistor (Bipolar Junction Transistor, BJT), an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) or a thyristor, and is not limited to the listed types.

[0085] Further, continue to refer to Figure 6 As shown, the device further includes a detection circuit electrically connected between the switch circuit 153 and the heating element 14, and the detection circuit is used to detect the electrical parameters output to the heating element 14. Specifically, Figure 6In the example of , the detection circuit includes a voltage detection circuit and / or a current detection circuit, the voltage detection circuit is used to detect the voltage output to the heating element 14, and the current detection circuit is used to detect the current output to the heating element 14. The voltage detection circuit includes a voltage divider circuit composed of a resistor R10 and a resistor R11, and a filter capacitor C14 is connected in parallel across the resistor R11; the control unit 151 can sample the voltage divider signal output by the voltage divider circuit through VOUT_ADC, thereby determining the voltage output to the heating element 14. The current detection circuit includes a sampling resistor R12 and a voltage difference processor U2. The sampling resistor R12 is electrically connected between the second electrode end of the second switch tube Q3 and the heating element 14 (shown as OUT+ in the figure). The input terminals IN+ and IN- of the voltage difference processor U2 are connected in parallel between the sampling resistor R12. The current output to the heating element 14 generates a voltage difference between the sampling resistor R12. The voltage difference processor U2 amplifies the voltage difference and outputs it through the output terminal OUT. The control unit 151 can sample the amplified voltage difference signal through IOUT_ADC, thereby determining the current output to the heating element 14. The resistor R13 and the capacitor C15 form a filter circuit for filtering the amplified voltage difference signal.

[0086] It should be noted that Figure 4 There are variations of the circuit 15 shown. For example, in one example, the switch circuit 153 can be disposed between the heating element 14 and the ground; in another example, the switch circuits can be disposed between the heating element 14 and the ground and between the boost circuit 152 and the heating element 14 at the same time.

[0087] Based on the above-mentioned aerosol generating device, in one example, the control unit 151 is configured to control the first switching circuit to be turned on so that the boost converter enters a boost mode, so that the boost converter boosts the cell voltage input by the voltage input pin and outputs it to the heating element through the voltage output pin; and is also configured to control the first switching circuit to be turned off so that the boost converter enters a direct-pass mode, so that the boost converter outputs the cell voltage input by the voltage input pin directly to the heating element through the voltage output pin.

[0088] like Figure 5 As shown, the third switch tube Q1 is an NMOS tube, the source of the NMOS tube is grounded, the drain of the NMOS tube is electrically connected to the feedback pin FB through the resistor R6, and the gate of the NMOS tube is electrically connected to the control unit 151.

[0089] When the control unit 151 outputs a high level to the third switch tube Q1, the third switch tube Q1 is turned on, the resistor R6 is connected in parallel with the resistor R4, and based on the voltage of the voltage output pin VOUT, a regulation signal is generated to the feedback pin FB, so that the boost converter U1 enters the boost mode. In the boost mode, the boost converter U1 boosts the voltage of the battery cell 16 inputted from the voltage input pin VIN, and outputs it to the heating element 14 through the voltage output pin VOUT.

[0090] When the control unit 151 outputs a low level to the third switch tube Q1, the third switch tube Q1 is disconnected, the resistor R4 is connected in series with the resistor R5, and another adjustment signal is generated to the feedback pin FB based on the voltage of the voltage output pin VOUT, so that the boost converter U1 enters the pass-through mode. In the pass-through mode, the boost converter U1 directly outputs the voltage of the cell 16 input by the voltage input pin VIN to the heating element 14 through the voltage output pin VOUT, that is, the voltage output by the voltage output pin VOUT is the voltage of the cell 16.

[0091] In specific applications, such as Figure 3 As shown, when the heating element 14 is in the heating stage and / or the heat preservation stage, the first switch circuit (third switch tube Q1) can be controlled to be turned on, so that the boost converter U1 enters the boost mode. When the heating element 14 is in the suction stage, the first switch circuit (third switch tube Q1) is controlled to be disconnected, so that the boost converter U1 enters the direct-through mode. In this way, on the one hand, it can avoid the boost circuit from maintaining the boost working state throughout the heating process, reduce energy consumption, and avoid long-term high current output that shortens the service life of the battery cell 16; on the other hand, when the boost converter U1 enters the direct-through mode, it can stably measure the output voltage or current, which is conducive to accurate measurement and control.

[0092] In applications without a heat preservation stage, the first switch circuit (third switch tube Q1) can be controlled to be turned on while the heating element 14 is heated from the initial temperature T0 to the target temperature (for example, T1 or T2), thereby causing the boost converter U1 to enter the boost mode; when the heating element is heated to the target temperature, the first switch circuit (third switch tube Q1) is controlled to be turned off, thereby causing the boost converter U1 to enter the direct-pass mode.

[0093] In one example, the control unit is configured to output a heating control signal to the second switching circuit to control the heating energy output to the heating element based on the voltage output by the voltage output pin.

[0094] like Figure 6As shown, the first switch tube Q2 adopts an NMOS tube, and the second switch tube Q3 adopts a PMOS tube. When the first switch tube Q2 is turned on under the action of the heating control signal of the control unit 151, the gate of the second switch tube Q3 is grounded through the first switch tube Q2, so that it is also turned on; when the first switch tube Q2 is turned off under the action of the heating control signal of the control unit 151, the voltage between the gate and the source of the second switch tube Q3 keeps it in a disconnected state. In this way, the control unit 151 can output a PWM signal with a preset duty cycle to the first switch tube Q2, so as to control the second switch tube Q3 to be alternately turned on or off, and then adjust the voltage output to the heating element 14 based on the voltage output from the voltage output pin VOUT, that is, adjust the heating power output to the heating element 14.

[0095] In one example, the control unit is configured to obtain the electrical parameter detected by the detection circuit, and adjust the heating control signal output to the second switch circuit based on the electrical parameter.

[0096] Electrical parameters include but are not limited to voltage, current, etc. Figure 6 As shown, the control unit 151 can detect the voltage or current output to the heating element 14 through VOUT_ADC or IOUT_ADC. Based on the voltage or current output to the heating element 14, it can be determined whether the heating element 14 fails, such as a short circuit failure of the heating element 14. When the heating element 14 fails, the second switch tube Q3 can be controlled to be disconnected.

[0097] In one example, the control unit is configured to output an enable control signal to the enable pin to start the boost converter.

[0098] like Figure 5 As shown, the enable pin EN of the boost converter U1 is electrically connected to the control unit 151. When the control unit 151 outputs an enable control signal to the enable pin EN, for example, outputs a low level signal to the enable pin EN, the boost converter U1 is enabled to start working. Generally, when the control unit 151 receives a heating start instruction, such as a key signal, a suction signal, etc., it outputs the enable control signal to the enable pin EN.

[0099] In some embodiments, the circuit 15 includes a memory for storing program instructions corresponding to the control method in any of the following method embodiments, so as to implement the control method in any of the following method embodiments. The control method provided by some embodiments of the present application is described below in conjunction with the exemplary application and implementation of the aerosol generating device provided in the embodiments of the present application. Figure 7 , Figure 71 is a flow chart of a control method for an aerosol generating device provided in an embodiment of the present application. It is understandable that the execution subject of the control method may be one or more control units 151 of the circuit.

[0100] like Figure 7 As shown, the method may specifically include the following steps:

[0101] S21, determine whether a heating start instruction is received? If a heating start instruction is received, execute step S22; otherwise, continue to detect and determine.

[0102] S22 , outputting an enable control signal to the enable pin EN of the boost converter U1 to start the boost converter U1 .

[0103] S23 , controlling the third switch tube Q1 to be turned on, so that the boost converter U1 enters the boost mode.

[0104] In the boost mode, the boost converter U1 boosts the voltage of the battery cell 16 inputted through the voltage input pin VIN and outputs the voltage to the heating element 14 through the voltage output pin VOUT.

[0105] S24 , controlling the heating power output to the heating element 14 so that the heating element 14 is raised from the initial temperature T0 to the target temperature T1 , and maintained at the target temperature T1 for a period of time ( t1 - t2 ).

[0106] S25, determine whether the preheating stage is over. If the preheating stage is over, execute step S26; otherwise, continue to execute step S24.

[0107] S26 , controlling the third switch tube Q1 to be turned off, so that the boost converter U1 enters the direct-through mode.

[0108] In the pass-through mode, the boost converter U1 outputs the cell 16 voltage inputted from the voltage input pin VIN directly to the heating element 14 through the voltage output pin VOUT, that is, the voltage outputted from the voltage output pin VOUT is the cell 16 voltage.

[0109] S27 . Control the heating power output to the heating element 14 until the suction phase of the heating element 14 ends.

[0110] 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, characterized in that: include: Battery cells, used to provide electricity; a heating element for heating the aerosol-forming substrate to generate an aerosol; A boost converter having a pass-through mode and a boost mode, the boost converter comprising a voltage input pin electrically connected to the battery cell, a voltage output pin electrically connected to the heating element, and a feedback pin; A voltage dividing circuit, comprising a first voltage dividing unit electrically connected between the voltage output pin and the feedback pin, a second voltage dividing unit electrically connected between the feedback pin and ground, and a first switch circuit connected in parallel with the second voltage dividing unit; A control unit is configured to control the first switch circuit to be turned on so that the boost converter enters a boost mode, so that the boost converter performs a boost conversion on the cell voltage inputted from the voltage input pin and outputs the voltage to the heating element through the voltage output pin; and is also configured to control the first switch circuit to be turned off so that the boost converter enters a pass-through mode, so that the boost converter outputs the cell voltage inputted from the voltage input pin directly to the heating element through the voltage output pin.

2. The aerosol generating device according to claim 1, characterized in that: The boost converter also includes an enable pin; The control unit is configured to output an enable control signal to the enable pin to start the boost converter.

3. The aerosol generating device according to claim 2, characterized in that: The control unit is configured to output the enable control signal to the enable pin when receiving a heating start instruction.

4. The aerosol generating device according to claim 1, characterized in that: The control unit is configured to control the first switch circuit to be turned on when the heating element is in a heating stage and / or a heat preservation stage; and to control the first switch circuit to be turned off when the heating element is in a suction stage.

5. The aerosol generating device according to claim 1, characterized in that: The control unit is configured to control the first switch circuit to be turned on during a period when the heating element is heated from an initial temperature to a target temperature; and to control the first switch circuit to be turned off when the heating element is heated to the target temperature.

6. The aerosol generating device according to claim 1, characterized in that: Also comprising a second switch circuit, the second switch circuit is electrically connected between the boost converter and the heating element or between the heating element and ground; The control unit is configured to output a heating control signal to the second switching circuit to control heating energy output to the heating element based on the voltage output from the voltage output pin.

7. The aerosol generating device according to claim 6, characterized in that: Also comprising a detection circuit electrically connected between the second switch circuit and the heating element, the detection circuit being used to detect an electrical parameter output to the heating element; The control unit is configured to obtain the electrical parameter detected by the detection circuit, and adjust the heating control signal output to the second switch circuit based on the electrical parameter.

8. The aerosol generating device according to claim 7, characterized in that: The detection circuit includes at least one of a voltage detection circuit and a current detection circuit. The voltage detection circuit is used to detect a voltage output to the heating element, and the current detection circuit is used to detect a current output to the heating element.

9. The aerosol generating device according to claim 6, characterized in that: The second switch circuit includes a first switch tube and a second switch tube; The first electrode end of the first switch tube is electrically connected to the control end of the second switch tube, the second electrode end of the first switch tube is grounded, and the control end of the first switch tube is used to receive the heating control signal; the first electrode end of the second switch tube is electrically connected to the boost converter, and the second electrode end of the second switch tube is electrically connected to the heating element.

10. The aerosol generating device according to claim 1, characterized in that Also includes an input filter unit and an output filter unit; The input filter unit is electrically connected between the battery cell and the voltage input pin, and the output filter unit is electrically connected between the voltage output pin and the heating element.

11. The aerosol generating device according to claim 1, characterized in that: The first switch circuit includes a third switch tube and a resistor connected in series.

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