Charging circuit and aerosol generating device

Abstract

The utility model relates to the technical field of charging, and particularly discloses a charging circuit and an aerosol generating device. The charging circuit includes: an input circuit configured to receive an input voltage; a rechargeable battery cell; the input circuit is electrically connected with the rechargeable battery cell, each charging branch circuit is electrically connected between the input circuit and the rechargeable battery cell and is used for receiving the input voltage and outputting charging current to the rechargeable battery cell, and at least one charging branch circuit comprises a linear charging circuit. Through the above mode, the charging current can be increased, the charging time can be shortened, and the cost of the aerosol generating device can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging, in particular to a charging circuit and an aerosol generating device. BACKGROUND

[0002] With the development of electronic atomization technology, higher requirements are put forward for the endurance of the aerosol generating device, so that the capacity of the battery of the aerosol generating device is getting larger and larger. At present, a linear charging chip or a switching charging chip is used to provide a charging current for the battery, so as to charge the battery. However, the charging current provided by a linear charging chip is small, which cannot meet the requirements of a large-capacity battery, resulting in a long time for the battery to be fully charged. The price of the switching charging chip is high, resulting in high cost of the aerosol generating device. SUMMARY

[0003] The embodiments of the present application provide a charging circuit and an aerosol generating device, which solve the problems that the charging current provided by a linear charging chip cannot meet the requirements of a large-capacity battery and the cost of a switching charging chip is high, can increase the charging current, shorten the charging time, and reduce the cost of the aerosol generating device.

[0004] In a first aspect, the embodiments of the present application provide a charging circuit, comprising:

[0005] an input circuit configured to receive an input voltage;

[0006] a chargeable battery;

[0007] at least two charging branches, each of which is electrically connected between the input circuit and the chargeable battery, used to receive the input voltage and output a charging current to the chargeable battery, and at least one of the charging branches comprises a linear charging circuit.

[0008] In some embodiments, the input circuit comprises:

[0009] an interface circuit configured to receive an input voltage;

[0010] a detection circuit electrically connected between the interface circuit and a ground terminal, used to detect the input voltage of the interface circuit to output a detection voltage.

[0011] In some embodiments, each of the at least two charging branches comprises a linear charging circuit, and at least two linear charging circuits are connected in parallel between the input circuit and the chargeable battery.

[0012] The charging circuit further comprises a first control circuit electrically connected with the detection circuit, the linear charging circuit and the rechargeable battery respectively, and the first control circuit is configured to control at least two linear charging circuits to be turned on at the same time and output first charging currents to the rechargeable battery based on the detection voltage sent by the detection circuit, and is configured to control at least two linear charging circuits to be turned off at the same time based on the charging time of the rechargeable battery.

[0013] In some embodiments, one of the at least two charging branches comprises a second control circuit, and the rest of the charging branches comprise linear charging circuits electrically connected between the input circuit and the rechargeable battery.

[0014] The second control circuit is electrically connected with the input circuit, the linear charging circuit and the rechargeable battery respectively, and the second control circuit is configured to output a second charging current to the rechargeable battery based on the detection voltage sent by the detection circuit, and is configured to control the linear charging circuits of the rest of the charging branches to be turned on at the same time and output first charging currents to the rechargeable battery respectively, and is configured to control the second control circuit and the linear charging circuits of the rest of the charging branches to be turned off based on the charging time of the rechargeable battery.

[0015] In some embodiments, the linear charging circuit comprises a linear charging chip.

[0016] In some embodiments, the linear charging circuit further comprises a first input filter circuit and a first output filter circuit, the first input filter circuit is electrically connected between the input circuit and the linear charging chip, and the first output filter circuit is electrically connected between the linear charging chip and the rechargeable battery.

[0017] In some embodiments, the second control circuit comprises:

[0018] An integrated control chip is electrically connected with the input circuit, the linear charging circuit and the rechargeable battery respectively, and the integrated control chip is configured to output a second charging current to the rechargeable battery based on the detection voltage sent by the detection circuit, and is configured to control the linear charging circuits of the rest of the charging branches to be turned on at the same time and output first charging currents to the rechargeable battery respectively, and is configured to control the integrated control chip and the linear charging circuits of the rest of the charging branches to be turned off based on the charging time of the rechargeable battery.

[0019] A second output filter circuit is electrically connected between the integrated control chip and the rechargeable battery.

[0020] In some embodiments, the integrated control chip comprises a power pin and a cell pin, the cell pin being electrically connected with the rechargeable cell;

[0021] The second output filter circuit comprises a first capacitor, a second capacitor and a bidirectional breakdown diode, the first capacitor being electrically connected between the power pin and a ground terminal, the second capacitor and the bidirectional breakdown diode being connected in parallel and electrically connected between the cell pin and the ground terminal.

[0022] In some embodiments, the detection circuit comprises a first resistor and a second resistor connected in series.

[0023] In a second aspect, the embodiments of the present application provide an aerosol generating device comprising the charging circuit according to any one of the first aspect.

[0024] The embodiments of the present application have the beneficial effects that: the at least two charging branches output charging current to the rechargeable cell, which can increase the charging current and shorten the charging time; meanwhile, the at least one charging branch comprises a linear charging circuit, which reduces the cost of the aerosol generating device. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0026] Figure 1 is a structural schematic diagram of a charging circuit according to an embodiment of the present application;

[0027] Figure 2 is a structural schematic diagram of a charging circuit comprising two or more linear charging circuits and a first control circuit according to an embodiment of the present application;

[0028] Figure 3 is a structural schematic diagram of a charging circuit comprising one linear charging circuit and a second control circuit according to an embodiment of the present application;

[0029] Figure 4 is a structural schematic diagram of a charging circuit comprising two or more linear charging circuits and a second control circuit according to an embodiment of the present application;

[0030] Figure 5 is a structural schematic diagram of a linear charging circuit according to an embodiment of the present application;

[0031] Figure 6 is a structural schematic diagram of a second control circuit according to an embodiment of the present application;

[0032] Figure 7 is a circuit schematic diagram of a charging circuit including two linear charging circuits and a first control circuit according to an embodiment of the present application;

[0033] Figure 8 is a circuit schematic diagram of a charging circuit including one linear charging circuit and a second control circuit according to an embodiment of the present application;

[0034] Figure 9 is a structural schematic diagram of an aerosol-generating device according to an embodiment of the present application. DETAILED DESCRIPTION

[0035] For the purpose of promoting an understanding of the principles of the application, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the application. It will, nevertheless, be understood that no limitation of the scope of the application is intended by the use of such specific language. When an element is claimed to be "connected" to another element, it can be directly connected to the other element or intervening elements can be present. When an element is claimed to be "connected" to another element, it can be directly connected to the other element or intervening elements can be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for the purpose of illustration only.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The use of the terms "and / or" includes a combination of one or more of the associated listed items.

[0037] Referring to Figure 1 , a charging circuit 100 provided by an embodiment of the present application includes an input circuit 10, a chargeable battery 20 and at least two charging branches 30.

[0038] The input circuit 10 is configured to receive an input voltage.

[0039] Referring to Figure 2 , Figure 3 or Figure 4 , the input circuit 10 includes an interface circuit 101 and a detection circuit 102. The interface circuit 101 is configured to receive an input voltage. The detection circuit 102 is electrically connected between the interface circuit 101 and a ground terminal, and is configured to detect the input voltage of the interface circuit 101 to output a detection voltage.

[0040] Interface circuit 101 includes a USB interface. In one example, a charger, electronic terminal, or other power source is connected to the USB interface via a USB charging cable, and power is transmitted to charging circuit 100 through the USB interface. Detection circuit 102 includes a voltage divider circuit, and the detected voltage is the voltage obtained by dividing the input voltage using the voltage divider circuit.

[0041] like Figure 7 As shown, the interface circuit 101 includes a USB interface J1 and its peripheral circuitry, specifically resistors R3 and R4, which are electrically connected to pins CC1 and CC2 of the USB interface J1, respectively. The detection circuit 102 includes a first resistor R1 and a second resistor R2 connected in series. A voltage divider node is set in the first resistor R1 and the second resistor R2, and it is electrically connected to the USBCHECK pin of the microcontroller U3. The microcontroller U3 determines whether the USB interface J1 is connected to power to receive input voltage by detecting the magnitude of the voltage received at the USBCHECK pin.

[0042] like Figure 8 As shown, the interface circuit 101 includes a USB interface J2 and its peripheral circuitry, specifically resistors R12 and R13, which are electrically connected to pins CC1 and CC2 of the USB interface J2, respectively. The detection circuit 102 includes a first resistor R10 and a second resistor R11 connected in series. A voltage divider node is set in the first resistor R10 and the second resistor R11, which is electrically connected to the USB CHECK pin of the integrated control chip U5. The integrated control chip U5 determines whether the USB interface J2 is connected to power to receive input voltage by detecting the magnitude of the voltage received at the USB CHECK pin.

[0043] In one example, the charging circuit 100 includes a single rechargeable battery cell 20. Further, the charging circuit 100 also includes a boost circuit electrically connected to the rechargeable battery cell 20. In another example, the charging circuit 100 includes two or more rechargeable battery cells 20, which are connected in series or parallel. The rechargeable battery cell 20 can be any suitable power source, such as a DC power source, or a battery. In one example, the battery is a lithium-ion battery; alternatively, the battery can be a nickel-metal hydride battery, a nickel-cadmium battery, or a lithium-based battery, such as a lithium cobalt, lithium iron phosphate, lithium titanate, or lithium polymer battery.

[0044] Each charging branch 30 is electrically connected between the input circuit 10 and the rechargeable cell 20 to receive the input voltage and output charging current to the rechargeable cell 20. At least one charging branch 30 includes a linear charging circuit.

[0045] The linear charging circuit is used to convert the input voltage received by the interface circuit 101 into a charging current, thereby charging the rechargeable battery cell 20. The linear charging circuit is inexpensive, reducing the cost of products in which the charging circuit 100 is used.

[0046] In some embodiments, the linear charging circuit can precisely control the charging current and voltage to ensure safe charging of the rechargeable cell 20. The linear charging circuit has overcurrent protection and overvoltage protection functions to prevent the rechargeable cell 20 from being overcharged and over-discharged.

[0047] Please refer to it again. Figure 2 As one embodiment, in at least two charging branches 30, each charging branch 30 includes a linear charging circuit 301, and at least two linear charging circuits 301 are connected in parallel between the input circuit 10 and the rechargeable battery cell 20.

[0048] The charging circuit 100 also includes a first control circuit 40, which is electrically connected to the detection circuit 102, the linear charging circuit 301 and the rechargeable battery cell 20, respectively. The first control circuit 40 is configured to control at least two linear charging circuits 301 to be turned on simultaneously based on the detection voltage sent by the detection circuit 102, so as to output a first charging current to the rechargeable battery cell 20, respectively; and is configured to control at least two linear charging circuits 301 to be turned off simultaneously based on the charging time of the rechargeable battery cell 20.

[0049] like Figure 7 As shown, the first control circuit 40 includes a microcontroller U3 and its peripheral circuits. The microcontroller U3 includes pins VCC, VSS, USB CHECK, and CHGEN. The peripheral circuit of the microcontroller U3 includes a filter circuit formed by capacitor C5 and resistor R9. The positive terminal B+ of the rechargeable battery cell 20 passes through resistor R9 to pin VCC of the microcontroller U3, and then through resistor R9 and capacitor C5 to the ground terminal; pin VSS is grounded; pin USB CHECK is used to check whether the USB interface J1 is connected to power; pin CHGEN is used to control at least two linear charging circuits 301 to start charging and to control at least two linear charging circuits 301 to stop charging.

[0050] In some embodiments, the first control circuit 40 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a microcontroller, an ARM (Acorn RISC Machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Furthermore, the first control circuit 40 may also be any conventional processor, controller, microcontroller, or state machine. The first control circuit 40 may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP, and / or any other such configuration.

[0051] It is understandable that the first charging current output by each linear charging circuit 301 can be equal or unequal. By superimposing the first charging currents output by at least two linear charging circuits 301, the charging current of the charging circuit 100 can be increased, reducing the charging time. For aerosol generation devices, this meets the fast charging requirements of aerosol generation devices, and because the linear charging circuit 301 has a low cost, it also meets the low-cost requirements of aerosol generation devices.

[0052] As one embodiment, in at least two charging branches 30, one charging branch 30 includes a second control circuit 302, and the other charging branches 30 all include a linear charging circuit 301, which is electrically connected between the input circuit 10 and the rechargeable battery cell 20.

[0053] In one example, please refer again. Figure 3 The charging circuit 100 includes two charging branches 30, one of which includes a second control circuit 302, and the other includes a linear charging circuit 301 electrically connected between the input circuit 10 and the rechargeable battery cell 20. In one example, please refer again... Figure 4 The charging circuit 100 includes two or more charging branches 30, one of which includes a second control circuit 302, and the remaining charging branches 30 each include a linear charging circuit 301, which is connected in parallel between the input circuit 10 and the rechargeable battery cell 20.

[0054] The second control circuit 302 is electrically connected to the input circuit 10, the linear charging circuit 301, and the rechargeable battery cell 20. The second control circuit 302 is configured to output a second charging current to the rechargeable battery cell 20 based on the detection voltage sent by the detection circuit 102, and simultaneously control the linear charging circuits 301 of the other charging branches 30 to turn on and output a first charging current to the rechargeable battery cell 20 respectively; and is configured to control the second control circuit 302 and the linear charging circuits 301 of the other charging branches 30 to turn off charging based on the charging time of the rechargeable battery cell 20.

[0055] It is understood that the first charging current output by at least one linear charging circuit 301 and the second charging current output by the second control circuit 302 can be equal or unequal. By superimposing the first charging current output by at least one linear charging circuit 301 and the second charging current output by the second control circuit 302, the charging current of the charging circuit 100 can be increased, and the charging time can be reduced. For aerosol generating devices, this can meet the fast charging requirements of aerosol generating devices. At the same time, due to the low cost of the linear charging circuit 301, it can also meet the low-cost requirements of aerosol generating devices.

[0056] It should be noted that, based on the charging time of the rechargeable cell 20, the linear charging circuit 301 that controls the second control circuit 302 and the other charging branches 30 to turn off charging can avoid the problem of inconsistent charging cut-off of at least two charging branches 30 and achieve charging consistency of at least two charging branches 30.

[0057] Based on the above embodiments, please refer to Figure 5 The linear charging circuit 301 includes a linear charging chip 3011.

[0058] The basic principle of the linear charging chip 3011 is to control the charging current through a linear regulator, so that the current flows directly through the regulator into the rechargeable cell 20. Its advantages are simple circuit, low cost, small size and low noise, which meets the charging management requirements of aerosol generation devices.

[0059] The rechargeable cell 20 includes a battery. The working process of the linear charging chip 3011 typically includes the following stages: (i) Pre-charge stage: When the battery voltage is less than a set threshold, the charging current is small to protect the battery from false triggering of protection or lifespan degradation due to large charging current at low charge levels. (ii) Constant current charging stage: When the battery voltage reaches a preset value, the charging current is larger, and the battery voltage gradually increases. (iii) Constant voltage charging stage: When the battery voltage is close to fully charged, the charging current gradually decreases, and the battery voltage remains constant. (iv) Charging completion stage: When the charging current decreases to a set value, charging ends. (v) Automatic recharge stage: After charging is completed, when a drop in battery voltage is detected, charging automatically resumes.

[0060] As can be seen, during the pre-charging stage and the constant current charging stage, the charging current of the linear charging chip 3011 gradually increases. Based on this, in some embodiments, the first control circuit 40 is also configured to control the linear charging chip 3011 to turn off charging based on the charging current of the linear charging chip 3011 and the preset charging cut-off current.

[0061] Furthermore, the linear charging circuit 301 also includes a first input filter circuit 3012 and a first output filter circuit 3013. The first input filter circuit 3012 is electrically connected between the input circuit 10 and the linear charging chip 3011, and the first output filter circuit 3013 is electrically connected between the linear charging chip 3011 and the rechargeable battery cell 20.

[0062] like Figure 7 As shown, the charging circuit 100 includes two charging branches 30. For one charging branch 30, the first input filter circuit 3012 includes capacitor C1, and the first output filter circuit 3013 includes capacitor C3. For the other charging branch 30, the first input filter circuit 3012 includes capacitor C2, and the first output filter circuit 3013 includes capacitor C4. Their specific connection relationships are as follows:

[0063] One of the charging branches 30 includes a linear charging chip U1, capacitors C1 and C3, resistors R5 and R7. The linear charging chip U1 includes pins IN, I SET, GND, TS, BAT, and EN. Pin IN is electrically connected to the VBUS pin of the USB interface J1 and capacitor C1; pin I SET is connected to ground via resistor R5; pins GND and TS are both grounded; pin BAT is electrically connected to capacitor C3 and the positive terminal B+ of the rechargeable battery cell 20, and after filtering by capacitor C3, it outputs the first charging current to the rechargeable battery cell 20; pin EN is connected to ground via resistor R7 and is also electrically connected to the CHGEN pin of the microcontroller U3.

[0064] Another charging branch 30 includes a linear charging chip U2, capacitors C2 and C4, resistors R6 and R8. The linear charging chip U2 includes pins IN, I SET, GND, TS, BAT, and EN. Pin IN is electrically connected to the VBUS pin of the USB interface J2 and capacitor C2; pin I SET is connected to ground via resistor R6; pins GND and TS are both grounded; pin BAT is electrically connected to capacitor C4 and the positive terminal B+ of the rechargeable battery cell 20, and after filtering by capacitor C4, it outputs the first charging current to the rechargeable battery cell 20; pin EN is connected to ground via resistor R8 and is also electrically connected to pin CHG EN of the microcontroller U3.

[0065] Please seeFigure 6 The second control circuit 302 includes an integrated control chip 3021 and a second output filter circuit 3022.

[0066] The integrated control chip 3021 is electrically connected to the input circuit 10, the linear charging circuit 301, and the rechargeable battery cell 20. The integrated control chip 3021 is configured to output a second charging current to the rechargeable battery cell 20 based on the detection voltage sent by the detection circuit 102, and simultaneously control the linear charging circuits 301 of the other charging branches 30 to turn on, each outputting a first charging current to the rechargeable battery cell 20. It is also configured to control the integrated control chip 3021 and the linear charging circuits 301 of the other charging branches 30 to turn off charging based on the charging time of the rechargeable battery cell 20.

[0067] In one example, the integrated control chip 3021 is a dedicated integrated chip for e-cigarettes. Dedicated integrated chips for e-cigarettes offer advantages such as a simpler, smaller, and lower-cost e-cigarette control system. They include charging modules, inhalation detection modules, and output power control modules, and possess the corresponding functions of these modules.

[0068] The second output filter circuit 3022 is electrically connected between the integrated control chip 3021 and the rechargeable battery cell 20.

[0069] In some embodiments, the integrated control chip 3021 includes a power supply pin and a battery cell pin, the battery cell pin being electrically connected to the rechargeable battery cell 20. The second output filter circuit 3022 includes a first capacitor, a second capacitor, and a bidirectional breakdown diode. The first capacitor is electrically connected between the power supply pin and a ground terminal, and the second capacitor and the bidirectional breakdown diode are connected in parallel and electrically connected between the battery cell pin and a ground terminal.

[0070] like Figure 8 As shown, the first input filter circuit 3012 includes a resistor R14 and a capacitor C6, and the first output filter circuit 3013 includes a capacitor C7. The second output filter circuit 3022 includes a first capacitor C8, a second capacitor C9, and a bidirectional breakdown diode D1. The charging circuit 100 includes two charging branches 30, whose specific connection relationship is as follows:

[0071] One of the charging branches 30 includes a linear charging chip U4, a resistor R14, a capacitor C6, a capacitor C7, a resistor R15, and a resistor R16. The linear charging chip U4 includes pins IN, I SET, GND, TS, BAT, and EN. Pin IN is electrically connected to the VBUS pin of the USB interface J2 and one end of resistor R14; pin I SET is connected to ground via resistor R15; pins GND and TS are both grounded; pin BAT is electrically connected to capacitor C7 and the positive terminal B+ of the rechargeable battery cell 20, and after filtering by capacitor C7, it outputs the first charging current to the rechargeable battery cell 20; pin EN is connected to ground via resistor R16 and is also electrically connected to pin CHG EN of the integrated control chip U5.

[0072] Another charging branch 30 includes an integrated control chip U5, a first capacitor C8, a second capacitor C9, and a bidirectional breakdown diode D1. The integrated control chip U5 includes pins VI N, BAT (cell pin), VDD (power supply pin), CHG EN, and USB CHECK. Pin VI N is electrically connected to the VBUS pin of the USB interface J2 and one end of resistor R14, meaning pin VI N is the input terminal of the charging module of the integrated control chip U5. Pin BAT is electrically connected to one end of the second capacitor C9, one end of the bidirectional breakdown diode D1, and the positive terminal B+ of the rechargeable cell 20. Pin VDD is connected to ground through the first capacitor C8. The other ends of the second capacitor C9 and the bidirectional breakdown diode D1 are both grounded. Pin CHG EN is electrically connected to the EN pin of the linear charging chip U4. Pin USB CHECK is electrically connected to the voltage divider node of the first resistor R10 and the second resistor R11.

[0073] The charging circuit provided in this application provides charging current to the rechargeable battery cell through at least two charging branches, which increases the charging current and shortens the charging time. Simultaneously, by including a linear charging circuit in at least one charging branch, the cost of the aerosol generation device is reduced.

[0074] Please see Figure 9 This application provides an aerosol generating apparatus according to its embodiments. Figure 9 As shown, the aerosol generating device 200 includes a charging circuit 100 as described in any embodiment of this application.

[0075] In some embodiments, the charging circuit 100 includes a first control circuit 40 or a second control circuit 302, and the aerosol generating device 200 further includes an airflow sensor electrically connected to the first control circuit 40 or the second control circuit 302 and electrically connected to the rechargeable battery cell 20. The airflow sensor is used to send a suction signal to the first control circuit 40 or the second control circuit 302 in response to a suction action. Further, the aerosol generating device 200 includes an atomizing component electrically connected to the first control circuit 40 or the second control circuit 302 and electrically connected to the rechargeable battery cell 20. The atomizing component is used to generate aerosol based on the control of the first control circuit 40 or the second control circuit 302. Optionally, the aerosol generating device 200 further includes an output power adjustment circuit electrically connected to the first control circuit 40 or the second control circuit 302 and electrically connected to the rechargeable battery cell 20. The output power adjustment circuit is used to adjust the output power of the atomizing component based on the control of the first control circuit 40 or the second control circuit 302.

[0076] It is understood that the aerosol generating device 200 may also include the structure and circuit modules of other existing aerosol generating devices, which will not be described in detail here.

[0077] It should be noted that while preferred embodiments of this application are provided in the specification and accompanying drawings, this application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this application; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this application. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this application's specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A charging circuit, characterized in that, include: The input circuit is configured to receive the input voltage; Rechargeable battery cells; At least two charging branches are provided, each of which is electrically connected between the input circuit and the rechargeable battery cell to receive the input voltage and output charging current to the rechargeable battery cell. At least one of the charging branches includes a linear charging circuit.

2. The charging circuit according to claim 1, characterized in that, The input circuit includes: The interface circuit is configured to receive input voltage; A detection circuit, electrically connected between the interface circuit and the ground terminal, is used to detect the input voltage of the interface circuit and output a detection voltage.

3. The charging circuit according to claim 2, characterized in that, In at least two of the charging branches, each of the charging branches includes a linear charging circuit, and at least two linear charging circuits are connected in parallel between the input circuit and the rechargeable battery cell; The charging circuit further includes a first control circuit, which is electrically connected to the detection circuit, the linear charging circuit, and the rechargeable battery cell. The first control circuit is configured to control at least two linear charging circuits to turn on simultaneously based on the detection voltage sent by the detection circuit, and to output a first charging current to the rechargeable battery cell respectively; and to control at least two linear charging circuits to turn off simultaneously based on the charging time of the rechargeable battery cell.

4. The charging circuit according to claim 2, characterized in that, In at least two of the charging branches, one of the charging branches includes a second control circuit, and the remaining charging branches all include a linear charging circuit, which is electrically connected between the input circuit and the rechargeable battery cell. The second control circuit is electrically connected to the input circuit, the linear charging circuit, and the rechargeable battery cell, respectively. The second control circuit is configured to output a second charging current to the rechargeable battery cell based on the detection voltage sent by the detection circuit, and at the same time control the linear charging circuits of the other charging branches to turn on and output a first charging current to the rechargeable battery cell, respectively. And the linear charging circuits of the second control circuit and the remaining charging branches are configured to shut down charging based on the charging time of the rechargeable battery cell.

5. The charging circuit according to claim 3 or 4, characterized in that, The linear charging circuit includes a linear charging chip.

6. The charging circuit according to claim 5, characterized in that, The linear charging circuit further includes a first input filter circuit and a first output filter circuit. The first input filter circuit is electrically connected between the input circuit and the linear charging chip, and the first output filter circuit is electrically connected between the linear charging chip and the rechargeable battery cell.

7. The charging circuit according to claim 4, characterized in that, The second control circuit includes: An integrated control chip is electrically connected to the input circuit, the linear charging circuit, and the rechargeable battery cell, respectively. The integrated control chip is configured to output a second charging current to the rechargeable battery cell based on the detection voltage sent by the detection circuit, and simultaneously control the linear charging circuits of the other charging branches to turn on, respectively, and output a first charging current to the rechargeable battery cell; and is also configured to control the integrated control chip and the linear charging circuits of the other charging branches to turn off charging based on the charging time of the rechargeable battery cell. The second output filter circuit is electrically connected between the integrated control chip and the rechargeable battery cell.

8. The charging circuit according to claim 7, characterized in that, The integrated control chip includes power supply pins and battery cell pins, and the battery cell pins are electrically connected to the rechargeable battery cell. The second output filter circuit includes a first capacitor, a second capacitor, and a bidirectional breakdown diode. The first capacitor is electrically connected between the power supply pin and the ground terminal. The second capacitor and the bidirectional breakdown diode are connected in parallel and electrically connected between the cell pin and the ground terminal.

9. The charging circuit according to claim 2, characterized in that, The detection circuit includes a first resistor and a second resistor connected in series.

10. An aerosol generating device, characterized in that, Includes the charging circuit as described in any one of claims 1-9.

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