Aerosol generating device and heating circuit used for aerosol generating device

Abstract

The utility model provides a heating circuit used for an aerosol generating device, comprising a heating unit, a conductive structure of which is a material with a positive temperature coefficient; the power supply protection unit is configured to protect a power supply unit of the aerosol generating device; the power supply auxiliary unit is connected with the power supply protection unit, and the power supply auxiliary unit is configured to store part of electric energy from the power supply unit in the aerosol generating device when the aerosol generating device is in a shutdown state, and release the stored electric energy within a first time duration after the aerosol generating device is started to heat; and the electric power control unit is configured to transmit the first electric energy and the second electric energy to the heating unit in a first time length so as to realize electric-heat conversion. The insufficient discharge capability of the power supply unit at the moment of starting the aerosol generating device can be avoided. The utility model further discloses an aerosol generating device which comprises the heating circuit. The internal power supply stability of the aerosol generating device can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of heat-not-burn aerosol generating devices and relates to a heating circuit for an aerosol generating device and an aerosol generating device comprising the heating circuit. Background Art

[0002] In order to increase the heating speed in current aerosol generating devices, it is usually necessary to optimize the heating unit, such as reducing the room temperature resistance of the heating unit to obtain greater instantaneous power, thereby generating more heat in the same time. However, this approach will cause the current flowing through the heating unit to increase, and put higher requirements on the current output capacity of the power supply unit (such as a battery). The traditional way of using a power supply unit to supply power often causes the overcurrent or over-discharge protection of the aerosol generating device for the excessive current generated at the moment of startup of the aerosol generating device, affecting the normal use of the aerosol generating device. At the same time, the excessive current generated at the moment of startup will also lower the voltage across the power supply unit, causing the over-discharge protection of the aerosol generating device, affecting the endurance of the aerosol generating device.

[0003] Traditional solutions include shortening cable lengths, increasing cable diameters, or using materials with lower resistivity to reduce line losses and increase the power delivered to the aerosol generating device. However, these methods have practical limitations because they still rely on the discharge capacity of the power supply unit itself. If the power supply unit's discharge capacity is insufficient, these measures will be significantly less effective and the desired heating effect will not be achieved.

[0004] Furthermore, instantaneous high currents can cause sudden voltage changes in the power supply unit, which in turn affects the power supply stability of the control unit and reduces the overall endurance of the aerosol generating device. Existing technologies have yet to find a solution to this problem that both increases the heating speed and reduces the output current pressure of the power supply unit.

[0005] Patent document CN208258101U uses a control unit to output a control signal to drive the heating module to heat and bake the cigarettes in a ring-shaped wrapping. However, it cannot solve the problem of insufficient battery discharge capacity at the moment of starting the aerosol generating device, which affects the normal use of the aerosol generating device.

[0006] The existing technology uses a battery to directly power the aerosol generating device. However, when the aerosol generating device is started, the power supply unit has insufficient discharge capacity, the voltage across the power supply unit is pulled down, and the problem of poor power supply stability inside the aerosol generating device has not been effectively solved. Utility Model Content

[0007] The purpose of the utility model is to solve the problem of how to avoid insufficient discharge capacity of the power supply unit at the moment of starting the aerosol generating device, the voltage at both ends of the power supply unit being pulled down, and poor power supply stability inside the aerosol generating device.

[0008] In a first aspect, the utility model provides a heating circuit for an aerosol generating device, comprising: a heating unit, the conductive structure of the heating unit comprising a material with a positive temperature coefficient; a power supply protection unit, configured to protect the power supply unit of the aerosol generating device; a power supply auxiliary unit, connected to the power supply protection unit, the power supply auxiliary unit being configured to store part of the electric energy from the power supply unit when the aerosol generating device is in a shutdown state, and to release the electric energy stored in the power supply auxiliary unit within a first time length after the aerosol generating device starts heating; an electric power control unit, respectively connected to the power supply auxiliary unit, the power supply protection unit, and the heating unit of the aerosol generating device, the electric power control unit being configured to transmit the first electric energy and the second electric energy to the heating unit within the first time length to realize electric-thermal conversion, wherein the first electric energy is the electric energy directly from the power supply unit, and the second electric energy is the electric energy released by the power supply auxiliary unit.

[0009] The above technical solution can avoid insufficient discharge capacity of the power supply unit at the moment of starting the aerosol generating device, prevent the voltage at both ends of the power supply unit from being pulled down, improve the stability of the power supply inside the aerosol generating device, and improve the endurance of the power supply unit.

[0010] According to another specific embodiment of the present invention, the power supply auxiliary unit includes at least two capacitors, the capacitance of the capacitor is 16uF-500uF, and the equivalent impedance of the capacitor is 0-0.5mΩ.

[0011] According to another specific embodiment of the present invention, the power supply auxiliary unit includes three capacitors connected in parallel, the capacitance of the capacitor is 22uF, and the equivalent impedance of the capacitor is 0.36mΩ.

[0012] According to another specific embodiment of the present invention, the electric power control unit includes: a switch processor connected to the heating unit; a first switch element connected to the switch processor and the microcontroller of the aerosol generating device, wherein the first switch element is configured to determine whether the first switch element is in an on state or an off state according to an eleventh control signal of the microcontroller, and the switch processor is configured to determine whether the electric power control unit transmits the first electric energy and / or the second electric energy to the heating unit according to the state of the first switch element.

[0013] According to another specific embodiment of the present utility model, it also includes: when the eleventh control signal is at a high level, the first switching element is in an on state, the switch processor is in an on state, the electric power control unit transmits the first electric energy and / or the second electric energy to the heating unit, and the heating unit generates heat; when the eleventh control signal is at a low level, the first switching element is in an off state, the switch processor is in an off state, the electric power control unit does not transmit the first electric energy and / or the second electric energy to the heating unit, and the heating unit does not generate heat.

[0014] According to another specific embodiment of the present invention, it also includes: a key circuit; a low-voltage difference regulator circuit, which is connected to the key circuit and the microcontroller of the aerosol generating device; the low-voltage difference regulator circuit is configured to determine whether the low-voltage difference regulator circuit is activated to output voltage based on the open and closed state of the key circuit when the aerosol generating device is in the off state so as to put the internal logic circuit of the aerosol generating device into a working state; wherein the internal logic circuit is controlled by the microcontroller, and the internal logic circuit includes at least one or more of a heating unit temperature measurement circuit, a power supply unit real-time voltage acquisition circuit, a vibration prompt circuit, an external power detection circuit, an indicator light circuit, a connector circuit and a charging management circuit.

[0015] According to another specific embodiment of the present invention, the low-voltage difference regulator circuit is configured to determine whether it is activated based on several control signals using a wired OR relationship. When any one or more of the control signals are at a high level, the low-voltage difference regulator circuit is activated; when all the control signals are at a low level, the low-voltage difference regulator circuit is not activated; wherein, the several control signals include at least a first control signal, and the first control signal is configured to determine whether it is at a high level or a low level based on the open and closed state of the key circuit when the aerosol generating device is in the off state.

[0016] According to another specific embodiment of the present invention, the key circuit includes a key switch. After the key switch is pressed, the key circuit is closed, the first control signal and the second control signal are high level, and the second control signal is configured so that when the second control signal is high level, the microcontroller can obtain the key value of the key switch through the second control signal to determine the output signal of the microcontroller; the key value includes a long key value and a short key value, and the microcontroller is configured to determine whether the eleventh control signal output by the microcontroller is high level or low level according to the long key value and whether the aerosol generating device is in the shutdown state or the heating state, and the microcontroller outputs the real-time voltage acquisition signal of the power supply unit according to the short key value, and then outputs the remaining power indication signal.

[0017] According to another specific embodiment of the present invention, the plurality of control signals further include a third control signal and a fourth control signal, wherein the microcontroller is configured such that after the low voltage dropout regulator circuit is activated by pressing a key switch, the microcontroller sets the third control signal to a high level; and the fourth control signal is configured such that after receiving an external power supply signal, the fourth control signal is at a high level.

[0018] According to another specific embodiment of the present invention, the power supply protection unit includes: a fifth processor, the input end of the fifth processor is connected to the positive pole of the power supply unit, and the output end of the fifth processor is connected to the negative pole of the power supply unit; a sixth processor is connected in series with the heating unit, wherein the fifth processor is configured to determine the voltage of the power supply unit and the current flowing through the sixth processor. When the detection value of the voltage of the power supply unit is less than the over-discharge threshold or greater than the overvoltage threshold, or the detection value of the current flowing through the sixth processor is greater than the overcurrent threshold, the sixth processor is instructed to disconnect, no current loop is formed, and the heating unit does not generate heat.

[0019] According to another specific embodiment of the present invention, the temperature measurement circuit of the heating unit includes: a temperature measuring element, which is fixedly connected to the heating unit; a second processor, which is connected to the temperature measuring element and a microcontroller, and the second processor is configured to amplify the signal captured by the temperature measuring element to form an amplified signal, and output it to the microcontroller, so that the microcontroller determines the temperature measurement value of the heating unit based on the amplified signal.

[0020] According to another specific embodiment of the present invention, the temperature measuring element includes a thermocouple, and the second processor includes: a first input interface for receiving a negative signal from the thermocouple; a second input interface for receiving a positive signal from the thermocouple; a power supply interface for receiving an output voltage from a low-voltage difference regulator circuit; a cold-end compensation interface for compensating for errors caused by changes in the cold-end temperature of the thermocouple; a first output interface and a second output interface connected to a microcontroller for outputting the amplified signal to the microcontroller.

[0021] According to another specific embodiment of the present invention, the charging management circuit includes: a fourth processor, configured to perform charging management on the power supply unit and output a charging status signal to a microcontroller, the charging status signal being configured to indicate the current charging status; a power supply unit temperature measurement circuit, including a first thermistor; a current limiting circuit, including a fourth resistor, wherein the fourth processor is configured to determine whether to charge the power supply unit based on whether the voltage of the first thermistor exceeds a preset voltage threshold, and the fourth processor determines whether to adjust the current based on whether the current flowing through the fourth resistor is a constant current, and the fourth processor determines whether to switch from a constant current charging mode to a constant voltage charging mode based on whether the voltage of the power supply unit reaches a full-charge voltage.

[0022] According to another specific embodiment of the present invention, the connector circuit includes a third connector, and the third connector includes: a power bus interface for providing an adapter interface for an external power source to charge the power supply unit; a fifth signal interface, configured to transmit a fifth signal from an external device to the microcontroller when the microcontroller of the aerosol generating device burns the program; a sixth signal interface, configured to transmit a sixth signal from the external device to the microcontroller of the aerosol generating device; a seventh signal interface, configured to transmit a seventh signal from the microcontroller of the aerosol generating device to the external device; wherein, the microcontroller is configured to receive temperature calibration data according to the sixth signal, and then calibrate the temperature measurement value of the heating unit according to the temperature calibration data, and finally feedback to the external device whether the calibration is completed through the seventh signal; or, the microcontroller is configured to receive temperature control data according to the sixth signal, and then modify the temperature control algorithm inside the microcontroller according to the temperature control data, and finally feedback to the external device whether the modification is completed through the seventh signal.

[0023] According to another specific embodiment of the present invention, it also includes an indicator light circuit, which is configured to indicate one or more of the working status, charging status and remaining power information of the aerosol generating device. The indicator light circuit includes several indicator lights, one end of each indicator light is connected to the output voltage end of the low-voltage difference regulator circuit, and the other end of the indicator light is connected to the microcontroller through a resistor. The indicator light is configured to determine whether it is lit based on whether the microcontroller outputs a high level or a low level.

[0024] According to another specific embodiment of the present utility model, the external power supply detection circuit includes: a fifth resistor and a sixth resistor, which are used to divide the external power supply, and the divided signal is output to the microcontroller to put the microcontroller at an operating voltage, and determine whether an external power supply is connected based on whether the divided signal is a high level or a low level. When an external power supply is connected, the microcontroller sets the eleventh control signal to a low level to stop the heating unit from heating, and the microcontroller outputs a control signal to the indicator light circuit to indicate the charging status.

[0025] According to another specific embodiment of the present invention, the real-time voltage acquisition circuit of the power supply unit includes: a seventh resistor and an eighth resistor, which are used to divide the voltage of the power supply unit, and the divided signal is output to the microcontroller to make the microcontroller at the working voltage, and the remaining power of the power supply unit is determined based on the divided signal.

[0026] According to another specific embodiment of the present invention, the vibration prompt circuit includes: a motor connected to a power supply unit, a second switching element connected to the motor and a microcontroller, wherein the second switching element is configured to determine whether it is in an on state or an off state according to a tenth control signal of the microcontroller, thereby determining whether the motor vibrates.

[0027] In a second aspect, the present invention provides an aerosol generating device comprising the above-mentioned heating circuit.

[0028] The adoption of the above technical solution can improve the stability of the power supply inside the aerosol generating device and increase the endurance of the power supply unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 FIG1 shows an internal block diagram of an aerosol generating device in an embodiment of the present invention;

[0030] Figure 2 A circuit diagram showing a connector of an aerosol generating device in an embodiment of the present invention;

[0031] Figure 3 A circuit diagram showing a charge management circuit of an aerosol generating device in an embodiment of the present invention;

[0032] Figure 4 A circuit diagram of a power supply protection unit of an aerosol generating device in an embodiment of the present invention is shown;

[0033] Figure 5 A circuit diagram showing a low-dropout voltage regulator circuit of an aerosol generating device in an embodiment of the present invention;

[0034] Figure 6 A circuit diagram showing an electric power control unit and a heating unit of an aerosol generating device in an embodiment of the present invention;

[0035] Figure 7 A circuit diagram of a power supply auxiliary unit of an aerosol generating device in an embodiment of the present invention is shown;

[0036] Figure 8 A circuit diagram showing a temperature measurement circuit of a heating unit of an aerosol generating device in an embodiment of the present invention is shown;

[0037] Figure 9 A circuit diagram of a microcontroller of an aerosol generating device in an embodiment of the present invention is shown;

[0038] Figure 10 A circuit diagram showing an indicator light circuit of an aerosol generating device in an embodiment of the present invention;

[0039] Figure 11 A circuit diagram showing an external power supply detection circuit of an aerosol generating device in an embodiment of the present utility model;

[0040] Figure 12 A schematic diagram showing a circuit for real-time voltage acquisition of a power supply unit of an aerosol generating device in an embodiment of the present invention;

[0041] Figure 13 A circuit diagram showing a vibration prompt circuit of an aerosol generating device in an embodiment of the present utility model;

[0042] Figure 14 A circuit diagram showing a key circuit of an aerosol generating device in an embodiment of the present utility model is shown. DETAILED DESCRIPTION

[0043] The following is an explanation of the implementation of the present invention by means of specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide an in-depth understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0044] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0045] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0046] In order to reduce the preheating time in the prior art, the resistance of the heating unit (such as a heating element) in the aerosol generating device is reduced to increase its power. However, the inventors have observed that when the temperature of the heating unit is low, especially in the cold start-up phase of the equipment, the resistance of the heating unit is relatively small, resulting in a large current at the moment of startup. This instantaneous large current may cause the voltage across the power supply unit to drop, triggering the overcurrent / over-discharge protection mechanism of the power supply protection unit, thereby interrupting the heating process and affecting the user experience. To solve this problem, the inventors have proposed an improved solution: utilizing the energy storage characteristics of the power supply auxiliary unit (such as a capacitor) to optimize the design of the heating circuit. In this way, the voltage drop across the power supply unit due to insufficient discharge capacity of the power supply unit can be avoided at the moment the aerosol generating device is started, thereby improving the stability of the power supply inside the device.

[0047] like Figure 1As shown, in the first aspect, the utility model provides a heating circuit for an aerosol generating device, wherein the heating unit can be a resistive heating element such as a heating tube. The heating circuit includes a heating unit, a power supply protection unit, a power supply auxiliary unit and an electric power control unit. The conductive structure of the heating unit includes a material with a positive temperature coefficient, which can be used to heat the aerosol generating product to generate an aerosol for inhalation. The power supply protection unit is configured to protect the power supply unit of the aerosol generating device (such as overvoltage protection, overcurrent protection or over-discharge protection, etc.), and the power supply unit can be a battery or a battery pack, which is not specifically limited here, as long as it can provide electrical energy to the heating unit. The power supply auxiliary unit is connected to the power supply protection unit, and the power supply auxiliary unit is configured to store part of the electrical energy from the power supply unit therein when the aerosol generating device is in the off state, and release the electrical energy stored in the power supply auxiliary unit within a first time length after the aerosol generating device starts heating. It should be noted that starting heating can be achieved by the user operating a button on the housing of the aerosol generating device (for example, pressing it for several seconds); the first time length can be the time it takes for the power supply auxiliary unit to release the stored electrical energy, for example 200ms-1s.

[0048] Preferably, the aerosol-generating product may be a smoking product in the shape of a cigarette; more preferably, the aerosol-generating product is a solid aerosol-generating product, including but not limited to tobacco flakes, tobacco particles, tobacco shreds, reconstituted tobacco, etc.

[0049] Furthermore, after the first time length ends, the temperature of the heating unit increases, and the resistance of the heating unit increases accordingly, the current of the heating circuit decreases, and the power supply auxiliary unit is no longer needed to supply power to the electric power control unit and the heating unit. The conductive structure of the heating unit includes a material with a positive temperature coefficient, and in particular, the conductive structure is made of a material with a positive temperature coefficient. The material with a positive temperature coefficient includes but is not limited to platinum alloy materials, tungsten alloy materials, etc. Since the conductive structure of the heating unit includes a material with a positive temperature coefficient, at the moment of starting the aerosol generating device, the temperature is low, the resistance is proportional to the temperature, and the resistance is small, which will generate a large instantaneous current, causing overcurrent or over-discharge protection of the power supply protection unit. The power supply auxiliary unit of the utility model can prevent overcurrent or over-discharge protection caused by the startup moment. The heating circuit of the utility model is not suitable for the case where the conductive structure of the heating unit is made of a material with a negative temperature coefficient. The reason is that the heating unit with a negative temperature coefficient of conductive material has a high resistance at room temperature, and the resistance decreases as the temperature of the heating unit rises. If there is a power supply auxiliary unit in the heating circuit, the voltage across the heating unit tends to be constant, which leads to a slower temperature rise in the preheating stage; and in the constant temperature stage, due to the presence of the power supply auxiliary unit, the voltage across the heating unit is constant, the resistance of the heating unit is low and the current is large, the instantaneous power of the heating unit is large, and large temperature fluctuations are easily generated, making temperature control in the constant temperature stage more difficult.

[0050] The electric power control unit is respectively connected to the power supply auxiliary unit, the power supply protection unit, and the heating unit of the aerosol generating device. The electric power control unit is configured to transmit the first electric energy and the second electric energy to the heating unit within a first time length to achieve electric-thermal conversion. The first electric energy is the electric energy directly from the power supply unit, which is transmitted to the electric power control unit, and the second electric energy is the electric energy released by the power supply auxiliary unit. In other words, within a short period of time after the aerosol generating device starts heating, there are two paths for power to be supplied to the heating unit. One is directly from the power supply unit and transmitted to the electric power control unit, and the other is from the power supply auxiliary unit to the electric power control unit. Finally, the electric power control unit transmits the two paths of electric energy to the heating unit respectively to achieve electric-thermal conversion.

[0051] The above technical solution can avoid insufficient discharge capacity of the power supply unit (such as a battery) at the moment the aerosol generating device is started, prevent the voltage at both ends of the power supply unit from being pulled down, improve the stability of the power supply inside the aerosol generating device, and improve the endurance of the power supply unit.

[0052] Specifically, the power supply auxiliary unit includes at least two capacitors with a capacitance of 16uF-500uF and an equivalent impedance of 0-0.5mΩ. The overall capacitance of the power supply auxiliary unit is 32uF-1000uF, and the overall equivalent impedance of the power supply auxiliary unit is 0-0.25mΩ. Using the above technical solution, the power supply auxiliary unit can provide sufficient electrical energy to the power control unit at the moment the aerosol generating device is started, which is then transferred to the heating unit for electrothermal conversion.

[0053] In some embodiments, as Figure 7 As shown, the power supply auxiliary unit includes three capacitors connected in parallel, each with a capacitance of 22uF and an equivalent impedance of 0.36mΩ. The above technical solution can ensure power supply stability while also saving costs, simplifying the circuit structure, and miniaturizing the aerosol generating device.

[0054] like Figure 6 As shown, in some embodiments, the power control unit includes: a switch processor M2 and a first switch element Q1 connected to the switch processor M2. The switch processor M2 is connected in series with the heating unit, and the first switch element Q1 is connected to a microcontroller. The microcontroller controls the closing and opening of the first switch element Q1 to switch the switch processor M2 to an on state or an off state, thereby placing the heating unit in an operating state or an inoperative state.

[0055] In some embodiments, the first switching element Q1 can be a metal-oxide-semiconductor field-effect transistor (MOSFET), whose collector 1 is connected to the switch processor M2, the emitter 2 is connected to the ground terminal CGND, and the base 3 is connected to the microcontroller. The first switching element Q1 can determine whether it is in a closed state or an open state based on an eleventh control signal H_EN output by the microcontroller. The switch processor M2 is configured to determine whether the switch processor M2 is in an on state or an off state based on the state of the first switching element Q1, thereby determining whether the power control unit transmits the first electrical energy and / or the second electrical energy to the heating unit.

[0056] In this embodiment, the collector of the first switch element Q1 is connected to the interface 3 of the switch processor M2. When the eleventh control signal H_EN is at a high level, the first switch element Q1 is in a closed state, its collector is connected to the ground terminal CGND, the interface 3 of the switch processor M2 is at a low level, the switch processor M2 is in a conducting state, so as to form a current loop, and the heating unit is in an operating state. Specifically, the current flows out from the power supply unit, for example, from Figure 6 The battery positive electrode B+ shown in FIG flows out, flows through the switch processor M2, the first switch element Q1, the heating unit H+ / H-, and finally flows into the ground terminal CGND. The heating unit is in a working state, and due to the Joule effect, the heating unit generates heat.

[0057] When the eleventh control signal H_EN is low, the first switch element Q1 is in the off state, its collector is high, and the interface 3 of the switch processor M2 is high. The switch processor M2 is in the off state, and no current loop is formed. Since no current flows through the heating unit H+ / H-, the heating unit is in a non-operating state and stops generating heat.

[0058] Continue to refer Figure 6 The eleventh resistor R9 prevents the positive electrode B+ of the power supply unit from being directly connected to ground when the first switching element Q1 is turned on, causing a short circuit. The tenth resistor R13 prevents direct grounding when the eleventh control signal H_EN is at a high level, thereby avoiding a short circuit. One end of the eleventh resistor R9 is connected to the positive electrode B+ of the power supply unit, and the other end is connected to the current inflow terminal 1 (collector) of the first switching element Q1. One end of the tenth resistor R13 is connected to the base of the first switching element Q1, and the other end is connected to ground.

[0059] Specifically, the model of the switch processor M2 is PB521BX, which is used to implement power control of the heating unit.

[0060] like Figure 4 and Figure 6As shown, in some embodiments, the power supply protection unit includes: a fifth processor U1 and a sixth processor M1. The power supply protection unit has overcurrent protection function, overvoltage protection function and over-discharge protection function.

[0061] The input terminal VDD of the fifth processor U1 is connected to the positive electrode of the power supply unit, and the output terminal VSS of the fifth processor U1 is connected to the negative electrode of the power supply unit. The sixth processor M1 is connected in series with the heating unit. The fifth processor U1 is configured to detect the voltage of the power supply unit and the current flowing through the sixth processor M1. When the detected value of the voltage of the power supply unit is less than the over-discharge threshold or greater than the over-voltage threshold, or when the detected value of the current flowing through the sixth processor M1 is greater than the over-current protection threshold, the sixth processor M1 is instructed to disconnect, no current loop is formed, and the heating unit does not generate heat.

[0062] The sixth processor M1 is connected in series with the power supply unit, the power control unit, and the heating unit to provide overcurrent protection. The fifth processor U1 is connected in parallel between the positive electrode B+ and the negative electrode GND of the power supply unit to detect the voltage across the power supply unit and provide overvoltage or over-discharge protection for the power supply unit.

[0063] like Figure 6 As shown in FIG, when the heating is turned on, the current from the positive pole of the power supply unit flows through the switch processor M2, flows through the heating unit (H+ / H-) and reaches the ground terminal CGND. Figure 4 The current that reaches the ground terminal CGND flows through the sixth processor M1 and reaches the negative electrode GND of the power supply unit. The fifth processor U1 controls the conduction and interruption of the sixth processor M1 based on the identified current and voltage signals. The first output port DO of the fifth processor U1 is connected to the first interface G1 of the sixth processor M1; the second output port CO of the fifth processor U1 is connected to the second interface G2 of the sixth processor M1. When the signals of the first output port DO and / or the second output port CO are abnormal, the sixth processor M1 is disconnected to protect the power supply unit from overvoltage, overcurrent, and over-discharge.

[0064] Specifically, when the fifth processor U1 identifies that the voltage difference between the first output port DO and the second output port CO is greater than a preset threshold, it means that the current detection value flowing through the sixth processor M1 exceeds the overcurrent threshold. The fifth processor U1 outputs a low level through the first output port DO and / or the second output port CO, causing the sixth processor M1 to be disconnected, no current loop is formed, overcurrent protection is performed, and the heating unit does not generate heat.

[0065] Specifically, when the fifth processor U1 detects that the voltage detection value between the positive electrode B+ and the negative electrode GND of the power supply unit is less than the over-discharge threshold or greater than the overvoltage threshold, it instructs the sixth processor M1 to disconnect, no current loop is formed, and the heating unit does not generate heat. When over-discharge protection is performed, when the fifth processor U1 detects an over-discharge signal, that is, when the voltage between the positive and negative electrodes of the power supply unit is lower than the preset over-discharge threshold, the fifth processor U1 will cause the first output port DO and / or the second output port CO to output a low level, causing the sixth processor M1 to disconnect, thereby preventing the power supply unit from over-discharging. When overvoltage protection is performed, when the fifth processor detects an overvoltage signal, that is, when the voltage of the power supply unit is higher than the preset overvoltage threshold, the fifth processor U1 will cause the first output port DO and / or the second output port CO to output a low level, causing the sixth processor M1 to disconnect, thereby preventing the power supply unit from over-voltage.

[0066] The over-discharge threshold and the over-voltage threshold are determined by the fifth processor U1, and the over-current threshold is determined by the internal threshold of the fifth processor U1 and the equivalent DC impedance of the sixth processor M1.

[0067] The adoption of the above technical solution can ensure the safety of the power supply unit during use and extend its service life. It can prevent the power supply unit from overvoltage, and avoid damage to the power supply unit due to overvoltage or safety hazards. When the power supply unit voltage is detected to be too high, the power supply protection unit cuts off the circuit, specifically, cuts off the circuit between the ground terminal CGND and the negative pole GND of the power supply unit. It can also prevent the power supply unit voltage from being too low, and avoid irreversible damage to the power supply unit due to excessive discharge. It can also prevent the aerosol generating device from having too much current, and avoid safety problems such as overheating of the power supply unit or causing a short circuit. When the circuit exceeds the set voltage or current safety range, the power supply protection unit interrupts the current flow to protect related circuits and components.

[0068] In the prior art, at the moment of startup, the temperature of the heating unit of an aerosol generating device is low, and the resistance of the heating unit is small, which can generate a transient high current and trigger the overcurrent / overdischarge protection of the power supply protection unit. In the present invention, due to the presence of the auxiliary power supply unit, at the moment of startup, the auxiliary power supply unit releases the electrical energy stored therein to the power control unit, which then transmits it to the heating unit. This relieves the pressure on the power supply unit to output current, prevents the power supply unit from outputting a transient high current, and prevents the voltage across the power supply unit from dropping excessively, thus preventing the overcurrent / overdischarge protection of the power supply protection unit from being triggered. This avoids the resulting heating interruption and improves the stability of the power supply to the aerosol generating device.

[0069] Continue to refer to Figure 1The aerosol generating device includes a power supply unit, a connector unit, an external power detection unit, a charging management unit, a power supply protection unit, a power supply unit real-time voltage acquisition unit, a power supply auxiliary unit, a microcontroller, a low-dropout voltage regulator unit, an electric power control unit, a heating unit temperature measurement unit, a key unit, a display unit, a vibration prompt unit, and a heating unit. When the aerosol generating device is shut down, a portion of the energy is transferred from the power supply unit to the power supply auxiliary unit. The power supply unit and the power supply auxiliary unit jointly provide electrical energy to the electric power control unit, which is then transferred to the heating unit for electrical-to-heat conversion. The energy is then transferred to the power supply protection unit to protect the circuit.

[0070] The connector unit is connected to the external power supply and the external power supply detection unit, charging management unit and communication unit of the aerosol generating device respectively. When the external power supply is connected to the aerosol generating device, the external power supply detection unit transmits the external power supply connection signal to the microcontroller, and the microcontroller sends a signal to the display unit, and the display unit indicates the charging status. The display unit can be, for example, an indicator light circuit. The connector unit is connected to the charging management unit, and the electric energy of the external power supply is transferred to the power supply unit through the charging management unit and the power supply protection unit to charge the power supply unit. The power supply protection unit detects the voltage and current of the power supply unit to prevent overvoltage or overcurrent. The connector unit is connected to the microcontroller through the communication unit, and is used to realize communication between the external device and the microcontroller of the aerosol generating device. The communication unit refers to the data line connected to the connector unit.

[0071] The power supply unit is connected to the power supply unit real-time voltage acquisition unit through the power supply protection unit. The power supply unit real-time voltage acquisition unit collects voltage information of the power supply unit and transmits the collected voltage information to the microcontroller. The microcontroller determines the remaining power of the power supply unit based on the voltage information, and the microcontroller sends a signal to the display unit to display the remaining power information.

[0072] A temperature measuring element is fixed to the heating unit. The heating unit's temperature measurement circuit transmits the signal detected by the temperature measuring element to the microcontroller, which determines the temperature measurement value of the heating unit based on this signal. The key unit is connected to the microcontroller, and the microcontroller determines whether the power control unit transmits power to the heating unit or controls the display unit to display the remaining power of the power supply unit based on the key value of the key unit.

[0073] The low-dropout voltage regulator unit is connected to the key unit and the microcontroller. When the aerosol generating device is in the off state and the key unit is in the on state, the low-dropout voltage regulator unit is activated to output a voltage, thereby operating the internal logic circuit of the aerosol generating device. The internal logic circuit is controlled by the microcontroller and includes at least one or more of the following: a heating unit temperature measurement unit, a power supply unit real-time voltage acquisition unit, a vibration prompt unit, an external power detection unit, an indicator light unit, a connector unit, and a charging management unit.

[0074] The microcontroller is connected to the vibration prompt unit, and the microcontroller outputs a signal to the vibration prompt unit so that the unit sends a vibration prompt.

[0075] The following specific circuit Figure 2-Figure 14 Introduce the relationship between each unit.

[0076] Figure 5 Schematic diagram of a low-dropout voltage regulator circuit of an aerosol generating device in an embodiment of the present invention. Figure 14 Schematic diagram of the key circuit of the aerosol generating device in the embodiment of the present invention. According to another specific embodiment of the present invention, refer to Figure 5 and Figure 14 The heating circuit of the aerosol generating device also includes a key circuit and a low dropout regulator (LDO) circuit.

[0077] refer to Figure 5 and Figure 14 The low-dropout voltage regulator circuit includes a first chip U3. The first enable terminal 3 of the first chip U3 is connected to the key circuit via a first diode D1. The first chip U3 is connected to the positive terminal of the power supply unit via the 4th terminal IN. The first chip U3 outputs a voltage via the 1st terminal OUT, which activates the internal logic circuit of the aerosol generating device. Specifically, the voltage is 3V, for example.

[0078] Specifically, refer to Figure 14 The key circuit includes a key switch S1. When the aerosol generating device is in the off state, when the key switch S1 is pressed, the circuit between the positive electrode B+ of the power supply unit and the resistor R17 and the key switch S1 is connected, and the key circuit is closed. At this time, the first control signal LDO_EN1 is at a high level. Figure 5 The EN pin of the first chip U3 is high, and the first chip U3 outputs a voltage (3V) from the OUT pin of the first chip. The internal logic circuit of the aerosol generating device is in operation. At least one of the heating unit temperature measurement circuit, the power supply unit real-time voltage acquisition circuit, the vibration prompt circuit, the external power detection circuit, the indicator light circuit, the connector circuit, and the charging management circuit is in operation.

[0079] In some embodiments, the key circuit is connected to the low-dropout voltage regulator circuit via a first control signal LDO_EN1. When the aerosol generating device is in the off state, the first control signal LDO_EN1 is configured to determine whether to activate the low-dropout voltage regulator circuit based on whether the key circuit is on or off. When the key circuit is on (closed), the low-dropout voltage regulator circuit is activated. When the key circuit is off, the low-dropout voltage regulator circuit is deactivated.

[0080] In some embodiments, when the aerosol-generating device is in the off state, when the key switch S1 is pressed, the key circuit closes, the first control signal LDO_EN1 and the second control signal KEY are high, the low-dropout voltage regulator circuit is activated, and the output voltage starts the microcontroller. At this time, the microcontroller obtains the key value of the key switch S1 through the second control signal KEY and determines the output signal of the microcontroller based on the key value. The key switch S1 has different key values, each corresponding to a different function of the aerosol-generating device. For example, a long key value corresponds to turning the aerosol-generating device on or off, while a short key value corresponds to displaying the remaining battery power of the aerosol-generating device. The microcontroller determines whether to output an eleventh control signal H_EN at a high or low level based on the long key value and whether the aerosol-generating device is in the off state or the heating state. The microcontroller outputs a real-time voltage acquisition signal BAT_ADC for the power supply unit based on the short key value. Specifically, when the key value is long and the aerosol-generating device is in the off state, the microcontroller outputs the eleventh control signal H_EN at a high level, turning on the power control unit and activating the heating unit. When the key value is long and the aerosol generating device is in the heating state, the microcontroller outputs the eleventh control signal H_EN at a low level, disconnecting the power control unit and stopping the heating unit. When the key value is short, the microcontroller outputs the power supply unit real-time voltage acquisition signal BAT_ADC to the power supply unit real-time voltage acquisition circuit to determine the remaining power of the power supply unit. The microcontroller then outputs the remaining power information to the display unit based on the remaining power of the power supply unit to indicate the remaining power. The microcontroller also controls the third control signal LDO_EN2 to a high level.

[0081] The microcontroller obtains the key value of the key switch S1 through the second control signal KEY and responds according to the key value (for example, turning on or off the heating circuit or displaying the remaining power of the aerosol generating device). When the microcontroller recognizes that the key value of the key switch S1 is a long key value, if the aerosol generating device is in the off state, the microcontroller outputs an eleventh control signal H_EN at a high level, the heating unit is in the working state, and at the same time, the microcontroller sets the third control signal LDO_EN2 high, the low-dropout voltage regulator circuit is turned on, and the internal logic circuit is in the working state. When the microcontroller recognizes that the key value of the key switch S1 is a long key value, if the aerosol generating device is in the heating state, the microcontroller outputs an eleventh control signal H_EN at a low level, the heating unit is in the non-working state, and at the same time, the microcontroller sets the third control signal LDO_EN2 low, the low-dropout voltage regulator circuit is turned off, and the internal logic circuit is in the non-working state.

[0082] When the key value is short, the microcontroller controls the display unit to display the remaining power of the aerosol generating device. Specifically, the display unit is an indicator light circuit. The microcontroller 17 interface outputs the real-time voltage acquisition signal BAT_ADC of the power supply unit to obtain the remaining power of the power supply unit. Based on the remaining power, the microcontroller sends a high or low signal to the corresponding indicator light circuit, turning the corresponding indicator light off or on.

[0083] In some embodiments, reference Figure 5 The low-dropout voltage regulator is configured to determine whether to activate the low-dropout voltage regulator circuit based on a plurality of control signals using a wired-OR relationship. When any one or more of the control signals is at a high level, the low-dropout voltage regulator circuit is activated and in an operating state. When all the control signals are at a low level, the low-dropout voltage regulator circuit is inactivated. The plurality of control signals include at least a first control signal LDO_EN1. The first control signal LDO_EN1 is configured to determine whether it is at a high level or a low level based on the on / off state of the key circuit when the aerosol generating device is in the off state.

[0084] The plurality of control signals includes at least a first control signal LDO_EN1 and a third control signal LDO_EN2. The first control signal LDO_EN1 is used to determine whether to activate a low-dropout voltage regulator circuit based on whether the key switch S1 is on or off. The third control signal LDO_EN2 is controlled by the microcontroller to keep the low-dropout voltage regulator circuit on or off.

[0085] Specifically, the microcontroller is configured such that when the low-dropout voltage regulator circuit is activated by pressing the pushbutton switch S1, the microcontroller operates and outputs a third control signal LDO_EN2 at a high level, maintaining the low-dropout voltage regulator circuit in continuous operation. This allows the aerosol generating device to maintain the output voltage of the low-dropout voltage regulator circuit under the control of the microcontroller without continuously pressing the pushbutton switch S1.

[0086] In some embodiments, the plurality of control signals further include a fourth control signal 5VDC, which is configured to connect to an external power signal. The fourth control signal 5VDC is configured to be high level after receiving the external power signal.

[0087] When the aerosol generating device needs to be shut down, by long-pressing the pushbutton switch S1, the microcontroller sets the third control signal LDO_EN2 to a low level. Because the aerosol generating device is not charging at this time, the fourth control signal 5VDC is also low. Since the first control signal LDO_EN1 is also low after releasing the pushbutton switch S1, the enable interface 3 of the first chip U3 is also low, and the first chip U3 stops outputting voltage, reducing the power consumption of the aerosol generating device when shut down. At the same time, the microcontroller output H_EN is low, disconnecting the power control unit, eliminating the current loop, and the heating unit does not generate heat.

[0088] According to another specific embodiment of the present invention, Figure 14 The key circuit also includes a first resistor R25, which is used to pull down the first control signal LDO_EN1 and the second control signal KEY to a low level when the key switch S1 is disconnected, ensuring that the low-voltage difference regulator circuit is not turned on. One end of the first resistor R25 is connected to the ground terminal CGND, and the other end is connected to the key switch S1, so that when the key switch S1 is disconnected, the first control signal LDO_EN1 is pulled down to a low level, thereby preventing the aerosol generating device from being turned on when the key switch S1 is not pressed. One end of the first resistor R25 is grounded to ensure that when the key switch S1 is disconnected, the second control signal KEY is pulled down to a low level, thereby avoiding obtaining the key value when the key switch S1 is not pressed, thereby increasing the convenience of use. Resistors R17 and R22 play a role in preventing short circuits. The function of the KEY1 end is to facilitate identification when wiring the printed circuit board (PCB). Wiring is required when designing a printed circuit board, and wiring is to connect two pads of the same signal or interface together. Avoid inconvenience in identifying signals or interfaces when unnamed signals or interfaces.

[0089] The above technical solution can ensure that the aerosol generating device works stably, prevent the aerosol generating device from working when the key switch is not pressed, and ensure the stability of the device.

[0090] refer to Figure 5 According to another specific embodiment of the present invention, a low-voltage dropout regulator circuit includes: a first chip U3; the cathode of the first diode D1 is connected to the enable interface 3 of the first chip U3. The cathode of the second diode D2 is connected to the enable interface 3 of the first chip U3. The cathode of the third diode D3 is connected to the enable interface 3 of the first chip U3. The first diode D1, the second diode D2, and the third diode D3 prevent reverse current flow, protect the components in the circuit, and improve the stability of the circuit structure. The first control signal LDO_EN1 passes through the first diode from the key circuit and is input to the enable interface 3 of the first chip U3. The microcontroller outputs the third control signal LDO_EN2, which passes through the second diode D2 and reaches the enable interface 3 of the first chip U3.

[0091] Among them, the first control signal LDO_EN1, the third control signal LDO_EN2 and the fourth control signal 5VDC are wired-OR connected, which is used for the first chip U3 to output voltage when any one or more of the first control signal LDO_EN1, the third control signal LDO_EN2 or the fourth control signal 5VDC is at a high level.

[0092] Continue to refer to Figure 14 When the aerosol generating device is turned off, the user presses the key switch S1, and the first control signal LDO_EN1 is high. Figure 5 In the example, the first control signal LDO_EN1 is high, the first chip U3 outputs a voltage (e.g., 3V), and the internal logic circuit is turned on. At this point, the microcontroller is turned on and outputs the third control signal LDO_EN2, which controls the first chip U3 to remain on, and the internal logic circuit remains on, until the microcontroller sets the third control signal LDO_EN2 low.

[0093] When the fourth control signal 5VDC is high, i.e., the power supply unit is in a charging state, the first chip U3 is turned on, the first chip U3 outputs a voltage, and the internal logic circuit is in an operating state. For example, the microcontroller outputs a signal to the indicator light circuit of the display unit, and the indicator light circuit indicates that the charging state is in progress.

[0094] Using this technical solution, simply pressing pushbutton switch S1 once maintains the output voltage of the low-dropout regulator circuit. When the first control signal LDO_EN1, the third control signal LDO_EN2, and the fourth control signal 5VDC are all low, the EN pin of U3 is also low, the LDO regulator stops outputting voltage, and the internal logic circuitry stops functioning, thereby reducing standby power consumption. This design helps to disable the internal logic circuitry when the aerosol generating device is turned off, minimizing power consumption.

[0095] The following combination Figure 8 The following describes a specific temperature measurement circuit for a heating unit. A temperature measurement element (e.g., a thermocouple) is fixedly mounted on the heating unit. For example, the thermocouple is a K-type thermocouple P2. The thermocouple is fixed to the heating unit and is used to measure the temperature of the heating unit in real time. The heating unit is, for example, a heating element.

[0096] Continue to refer to Figure 8 In some embodiments, the heating unit temperature measurement circuit further includes a second processor U4. The second processor U4 is connected to the temperature measuring element and the microcontroller. The second processor U4 is configured to amplify the signal captured by the temperature measuring element to form an amplified signal K_TEMP and output the amplified signal to the microcontroller. The microcontroller determines the temperature measurement value of the heating unit based on the amplified signal K_TEMP.

[0097] Specifically, the second processor U4 is a chip that amplifies the temperature sensor's signal. Because the voltage signal generated by the temperature sensor is very weak, typically only in the millivolt range or even lower, the second processor U4 amplifies the signal so that the microcontroller can accurately read the signal and determine the temperature.

[0098] The second processor U4 includes: a first input interface IN-, a second input interface IN+, a cold end compensation interface VSS-, a power supply interface VSS+, a first output interface SENSE and a second output interface OUT. Among them, the first input interface IN- is used to receive the negative signal from the thermocouple. The second input interface IN+ is used to receive the positive signal from the thermocouple. The cold end compensation interface VSS- is used to compensate for the error caused by the change in the cold end temperature of the thermocouple. The power supply interface VSS+ is used to receive the output voltage from the low-dropout regulator circuit. The first output interface SENSE and the second output interface OUT are connected to the microcontroller and are used to output the amplified signal K_TEMP to the microcontroller. Among them, the signal of the first output terminal SENSE corrects the signal of the second output terminal OUT. The amplified signal K_TEMP is input to the 11 interface of the microcontroller. The analog-to-digital converter (ADC) in the 11 interface of the microcontroller converts the amplified signal K_TEMP into a digital signal. The microcontroller determines the temperature measurement value of the heating unit based on the thermocouple signal-temperature table stored in it.

[0099] Second processor U4 has a reference terminal internally, which represents the temperature change of the thermocouple caused by changes in the cold junction (i.e., room temperature). The cold junction compensation interface VSS- identifies the temperature change at the reference terminal, and second processor U4 calculates and subtracts the temperature change at the reference terminal to obtain the accurate thermocouple temperature measurement.

[0100] By adopting the above technical solution, the signal measured by the temperature measuring element can be amplified with high precision so that the microcontroller can accurately determine the temperature measurement value of the heating unit, and at the same time compensate for the measurement value deviation caused by the temperature change of the reference end, thereby ensuring the accuracy of the temperature measurement value of the heating unit.

[0101] Continue to refer Figure 8 and Figure 9 The voltage signal input by the second processor U4 through the first input interface 1 (IN-) and the second input interface 8 (IN+) is transmitted to the second processor U4. After internal correction and amplification by the second processor U2, the amplified signal K_TEMP is output to the interface 11 of the microcontroller through the first output interface SENSE and the second output interface OUT. Among them, the function of capacitors C12 and C13 is to stabilize the voltage of the first cold junction compensation terminal VSS-. Capacitor C10 plays the role of stabilizing the output voltage of the low-voltage difference regulator circuit. Capacitors C11 and C8 filter the voltage data of the thermocouple. Capacitor C9 is used to maintain the voltage stability between the positive and negative poles of the thermocouple P2. Resistors R15, R12 and R10 play the role of preventing short circuits.

[0102] The following combination Figure 2 The connector circuitry is described in detail below. It includes a third connector J1, which manages and controls the charging and data transfer functions of the Universal Serial Bus (USB) Type-C interface. This connector J1 includes a power bus interface VBUS, a first configuration channel CC1, a second configuration channel CC2, a fifth signal SWIO interface DP, a sixth signal RXD interface DN, and a seventh signal TXD interface SBU.

[0103] Among them, the power bus interface VBUS is connected to the external power supply and is used to provide an adapter interface for the external power supply to charge the power supply unit. The first configuration channel CC1 and the second configuration channel CC2 are used to determine the insertion direction of the charging cable. Specifically, whether the charging cable is inserted into the USB interface in the forward direction or in the reverse direction. The fifth signal SWIO interface DP of the aerosol generating device is configured to transmit the fifth signal SWIO from the external device to the microcontroller when the microcontroller of the aerosol generating device burns the program. Specifically, the fifth signal SWIO is a reset signal, which is used for the external device to issue a reset instruction to the microcontroller of the aerosol generating device. The interface DP includes a first interface DP1 and a second interface DP2, which are used to transmit the fifth signal SWIO from the external device to the microcontroller when the microcontroller of the aerosol generating device burns the program. The sixth signal RXD interface DN of the aerosol generating device is configured to transmit the sixth signal RXD from the external device to the microcontroller of the aerosol generating device. The interface DN includes a third interface DN1 and a fourth interface DN2 for high-speed data transmission. The seventh signal TXD interface SBU is configured to transmit a seventh signal TXD from the microcontroller of the aerosol generating device to the external device. The interface SBU includes a fifth interface SBU1 and a sixth interface SBU2 for high-speed data transmission.

[0104] Specifically, when the transmitted data is temperature calibration data, the microcontroller is configured to receive the temperature calibration data according to the sixth signal RXD, and then calibrate the temperature measurement value of the heating unit according to the temperature calibration data, and finally feedback to the external device whether the calibration is completed through the seventh signal TXD.

[0105] When the transmitted data is temperature control data, the external device sends the temperature control data to the microcontroller through the sixth signal RXD. Specifically, the temperature control data is a temperature curve, that is, the change of temperature over time. The microcontroller modifies the temperature control algorithm set inside the microcontroller according to the received temperature control data. The microcontroller feeds back to the external device a signal indicating whether the modification of the temperature control data is completed by sending the seventh signal TXD.

[0106] The temperature calibration data is data in the data format of temperature, and the temperature control data is data in the data format of temperature-time.

[0107] Specifically, refer to Figure 2 and Figure 9, the SWIO signal is transmitted from the first port DP1 and the second port DP2 of the third connector J1 to R34, converted into a SWMIO signal, and communicates with the 5 port of the microcontroller. The RXD signal is transmitted from the third port DN1 and the fourth port DN2 of the third connector J1, converted into a DSDA signal through a first current limiting resistor (not shown), transmitted to the microcontroller, and communicates with the 8 port of the microcontroller. The 22 port of the microcontroller outputs a DSCK signal, which is converted into a seventh signal TXD through a second current limiting resistor (not shown), and communicates with the external device through the fifth port SBU1 and the sixth port SBU2 of the third connector J1. Among them, the 8 port of the microcontroller is connected to the positive electrode of the output voltage of the low-voltage difference regulator circuit through a first pull-up resistor R27, which is used to keep the 8 port of the microcontroller at a high level when idle, improve the anti-interference ability of the interface, and avoid bit errors. The 22 interface of the microcontroller is connected to the positive electrode of the output voltage of the low-voltage difference regulator circuit through the second pull-up resistor R19, which is used to keep the 22 interface of the microcontroller at a high level when in an idle state, thereby improving the anti-interference ability of the interface and avoiding bit errors.

[0108] When the third connector J1 is used to program the aerosol-generating device, the third and fourth interfaces DN1 and DN2 can also transmit a ninth signal CLK. The external device transmits the ninth signal CLK to the microcontroller of the aerosol-generating device via the third and fourth interfaces DN1 and DN2, thereby enabling program programming. Specifically, the ninth signal CLK is, for example, a clock signal. When the third connector J1 is used to program the aerosol-generating device, the fifth and sixth interfaces SBU1 and SBU2 can also transmit a tenth signal DAT. The microcontroller outputs the tenth control signal DAT and connects it to the external device via the fifth and sixth interfaces SBU1 and SBU, thereby enabling program programming.

[0109] With the above technical solution, the third connector J1 can charge the power supply unit of the aerosol generating device through the power bus interface VBUS and the ground terminal CGND. The third connector J1 can also perform data transmission, providing communication function for the aerosol generating device.

[0110] The following combination Figure 11 The external power detection circuit is described in detail below. The external power detection circuit includes a fifth resistor R20 and a sixth resistor R23, which are used to divide the external power supply voltage. The divided signal 5VIN is output to the microcontroller to maintain the microcontroller's operating voltage. The microcontroller determines whether the external power supply is connected based on whether the divided signal 5VIN is at a high or low level. Specifically, the resistance ratio of the fifth resistor R20 to the sixth resistor R23 is greater than or equal to 2:3. The circuit is used to divide the external power supply voltage so that the divided signal 5VIN does not exceed the microcontroller's operating voltage.

[0111] exist Figure 9 In the embodiment, the eighth signal 5VIN is input to the interface 16 of the microcontroller. Figure 9 and Figure 11 One end of the external power detection circuit is connected to the positive terminal of the external power supply, and the other end is connected to the ground terminal CGND. When the external power supply is turned on, the external power supply charges the aerosol generating device. The fifth resistor R20 and the sixth resistor R23 are used to divide the voltage so that the eighth signal 5VIN connected to the microcontroller is within the microcontroller's operating voltage range. When the external power supply 5V is connected, the eighth signal 5VIN is high. The microcontroller recognizes this high level and the aerosol generating device enters the charging state. The microcontroller sets the eleventh control signal H_EN to a low level, causing the heating unit to stop heating. Simultaneously, the microcontroller outputs a control signal to the indicator light circuit, causing the corresponding indicator light to illuminate or extinguish to indicate the charging status.

[0112] When no external power supply is connected, the eighth signal 5VIN is at a low level. The microcontroller recognizes that the eighth signal 5VIN is at a low level, and the aerosol generating device is in a non-charging state.

[0113] By adopting the above technical solution, the aerosol generating device can detect whether there is an external power source to charge the aerosol generating device.

[0114] The following combination Figure 3 The charging management circuit is described in detail. The charging management circuit includes: a fourth processor U2, a power supply unit temperature measurement circuit, a battery, a current limiting circuit, and a charging voltage detection module. In this embodiment, the power supply unit is a battery.

[0115] Among them, reference Figure 3The fourth processor U2 is configured to manage the charging of the power supply unit and output a charging status signal STAT to the microcontroller. The charging status signal STAT is configured to indicate the current charging status. In this embodiment, the power supply unit is a battery BT1. The power supply unit temperature measurement circuit is composed of a second resistor R3 and a first thermistor R7 connected in parallel with a third resistor R1 in series. It is used to detect the temperature of the power supply unit and input the temperature signal to the input terminal TS of the fourth processor U2. The fourth processor U2 is configured to determine whether to charge the power supply unit based on whether the voltage of the first thermistor R7 determined by the TS interface exceeds a preset voltage threshold. The fourth processor U2 determines whether the temperature of the power supply unit exceeds the threshold based on the voltage signal. If so, the fourth processor U2 disconnects, does not form a current loop, and stops charging the power supply unit. If not, the fourth processor U2 connects, forms a current loop, and charges the power supply unit. The resistance of the first thermistor R7 increases with increasing temperature. When the temperature of the power supply unit rises, the resistance of the first thermistor R7 increases, and the voltage signal of the TS interface increases. When the voltage signal of the TS interface is higher than the preset voltage threshold, the fourth processor is disconnected internally, no current loop is formed, and charging of the battery BT1 is stopped, thereby preventing the battery BT1 from overheating.

[0116] In this embodiment, the power supply unit is a battery BT1. The charging management circuit also includes a current limiting circuit, including a fourth resistor R8, for limiting the current flowing into the battery BT1. The fourth processor U2 determines whether to adjust the current based on whether the current flowing through the fourth resistor R8 is a constant current, as determined by the RS interface. Specifically, the second output interface RS of the fourth processor U2 identifies the current flowing through the fourth resistor R8. When the current flowing through the fourth resistor R8 is not constant, the fourth processor U2 internally adjusts the current output from the first output interface SW to the fourth resistor R8 so that the current flowing through the fourth resistor R8 is constant, that is, the charging current for the battery positive terminal B+ is constant. The third output interface BST and the first capacitor C4 are used to stabilize the voltage of the first output interface SW. The inductor L1 serves to stabilize the current output. When current passes through the inductor L1, the inductor L1 temporarily stores electrical energy and releases the energy when the current decreases, thus filtering and stabilizing the output, so that the battery positive terminal B+ receives a stable charging current.

[0117] The specific principle of setting the constant current charging of the fourth resistor R8 is as follows: current detection and feedback: when the current flows through the fourth resistor R8, a voltage drop proportional to the current will be generated on the fourth resistor R8. This voltage drop signal is fed back to the RS interface of the fourth processor U2. The fourth processor U2 has a reference voltage inside, and the fourth processor U2 compares the reference voltage with the voltage drop on the fourth resistor R8. If the current is too large, so that the voltage drop on the fourth resistor R8 is greater than or equal to the reference voltage, the fourth processor U2 will reduce the charging current to maintain a constant current value. If the current is small, the voltage drop on the fourth resistor R8 is less than the reference voltage, and the fourth processor U2 will increase the charging current until the voltage drop on the fourth resistor R8 reaches the reference voltage. The charging current is kept constant by adjustment by the fourth processor U2. The resistance value of the fourth resistor R8 and the reference voltage inside the fourth processor U2 jointly determine the charging current value in the constant current stage. For example, assuming the reference voltage is V ref , the resistance of the fourth resistor R8 is R, then the constant current I cc About I cc =V ref / R.

[0118] In this embodiment, the power supply unit is a battery BT1. The charging management circuit also includes a charging voltage detection module. The charging voltage detection module is connected to the positive electrode of the battery through the fourth output interface BAT, and GND is connected to the negative electrode of the battery to detect the voltage across the battery. The fourth processor U2 determines whether to switch from the constant current charging mode to the constant voltage charging mode based on whether the voltage of the power supply unit determined by the BAT interface reaches the full-charge voltage. When the voltage across the battery is lower than the first charging voltage threshold, the fourth processor U2 adopts trickle charging. When the voltage across the battery is greater than or equal to the first charging voltage threshold and less than the full-charge voltage, the fourth processor U2 adopts the constant current charging mode. When the voltage across the battery is greater than or equal to the full-charge voltage threshold, the fourth processor U2 adopts the constant voltage charging mode.

[0119] Specifically, the fourth processor U2 supports trickle charging, constant current charging, and constant voltage charging. Trickle charging is used to charge the battery at a lower current when the battery voltage is below a first charging voltage threshold to prevent damage to the battery caused by high current. The operating principle of trickle charging is that when the fourth processor U2 detects that the battery voltage is below a certain threshold, it will output a trickle current to charge the battery. For example, the first charging voltage threshold is 2.8V, and the trickle current is 100mA. The battery voltage increases with the battery charge level. When the voltage across the battery is greater than or equal to the first charging voltage threshold and less than the full-charge voltage, U2 switches to constant current charging mode. Constant current charging is used to charge the battery at a constant current when the battery voltage reaches a certain level (but is not fully charged), improving charging efficiency. The fourth processor U2 adjusts the output current based on the feedback voltage of the fourth resistor R8 to ensure current stability. This mode is typically used when the battery voltage is low but within a safe range. For example, the constant current charging current is 100mA-3A. The specific constant current charging current can be achieved by setting different resistors. Among them, the full-charge voltage is, for example, the voltage across the battery in a fully charged state of 4.2V. Constant voltage charging is used when the battery is nearly full, that is, when the voltage across the battery is greater than or equal to the full-charge voltage, charging is performed at a constant voltage to avoid overcharging and battery damage. When the battery voltage reaches the full-charge voltage, the fourth processor U2 switches to a constant voltage charging mode. At this stage, the fourth processor U2 maintains a constant output voltage (usually the full-charge voltage of the battery, such as 4.2V). As the battery charging progresses, the current will gradually decrease until it drops to a very small value (usually about 10% of the constant current), at which point charging is complete. The microcontroller outputs a signal to the indicator light circuit or the vibration prompt circuit to indicate that charging is complete.

[0120] The above technical solution can provide a safe and efficient charging process for the aerosol generating device, monitor the temperature of the power supply unit in real time, prevent the power supply unit from overheating and causing danger, and dynamically adjust the output voltage and current based on the detected voltage information of the power supply unit to ensure stable operation of the aerosol generating device.

[0121] refer to Figure 3 and Figure 9 The fourth processor U2 outputs a thirteenth control signal STAT to the microcontroller, transmitting the charging status of the aerosol generating device to the microcontroller. The microcontroller then sends a signal to the indicator circuit to indicate the charging status. Using this technical solution, the aerosol generating device can indicate the charging status. The charging status can be, for example, a charging state or a charging complete state.

[0122] In some embodiments, the indicator light circuit is configured to indicate one or more of the working status, charging status and remaining power information of the aerosol generating device. The indicator light circuit includes several indicator lights, one end of each indicator light is connected to the output voltage end of the low-voltage difference regulator circuit, and the other end of the indicator light is connected to the microcontroller through a resistor. The indicator light is configured to determine whether it is lit based on whether the microcontroller outputs a high level or a low level.

[0123] The following combination Figure 10 The following is a detailed introduction to the indicator light circuit. When the input terminal of the microcontroller is at a low level, the indicator light is on, and when the input terminal of the microcontroller is at a high level, the indicator light is off.

[0124] The indicator light circuit also includes resistors R28, R29, and R30, which are connected in series with the three cathodes of the first indicator light LED1 to prevent short circuits. The indicator light circuit also includes resistors R31, R32, and R33, which are connected in series with the three cathodes of the second indicator light LED2 to prevent short circuits. In some embodiments, there can be multiple LED indicators, and the corresponding indicator diodes can also be multiple, which is not limited here. For example, the first indicator light LED1 includes a first indicator diode, a second indicator diode, and a third indicator diode; the second indicator light LED2 includes a fourth indicator diode, a fifth indicator diode, and a sixth indicator diode.

[0125] For example, there are 6 indicator diodes (such as Figure 6 As shown in the LED1 to LED6), when the LEDn (n=1...6) signal is low, the corresponding indicator diode is lit; when the LEDn (n=1...6) signal is high, the corresponding indicator diode is off.

[0126] Specifically, when the microcontroller 4 interface outputs a low level, line 1 of the first indicator LED 1 is connected, and current flows from the output voltage terminal of the low-voltage dropout regulator circuit, through the first indicator diode, through resistor R28, and reaches the low-level microcontroller 4 interface, thereby lighting the first indicator diode. Similarly, when the microcontroller 3 interface outputs a low level, line 3 of the first indicator LED 1 is connected, and current flows from the output voltage terminal of the low-voltage dropout regulator circuit, through the second indicator diode, through resistor R29, and reaches the low-level microcontroller 3 interface, thereby lighting the second indicator diode. When the microcontroller 2 interface outputs a low level, line 4 of the first indicator LED 1 is connected, and current flows from the output voltage terminal of the low-voltage dropout regulator circuit, through the third indicator diode, through resistor R30, and reaches the low-level microcontroller 2 interface, thereby lighting the third indicator diode. When the microcontroller 23 interface outputs a low level, line 1 of the second indicator LED2 is connected, and current flows from the output voltage terminal of the low-voltage dropout regulator circuit, through the fourth indicator diode, through resistor R31, and reaches the low-level microcontroller 23 interface, lighting up the fourth indicator diode. When the microcontroller 24 interface outputs a low level, line 3 of the second indicator LED2 is connected, and current flows from the output voltage terminal of the low-voltage dropout regulator circuit, through the fifth indicator diode, through resistor R32, and reaches the low-level microcontroller 24 interface, lighting up the fifth indicator diode. When the microcontroller 1 interface outputs a low level, line 4 of the second indicator LED2 is connected, and current flows from the output voltage terminal of the low-voltage dropout regulator circuit, through the sixth indicator diode, through resistor R33, and reaches the low-level microcontroller 1 interface, lighting up the sixth indicator diode.

[0127] In some embodiments, the indicator light circuit may also indicate the operating status of the aerosol generating device. For example, if all indicator lights are on, it means that the aerosol generating device is heating up.

[0128] In some embodiments, the indicator light circuit may also indicate the charging status of the aerosol generating device, for example, the indicator light flashes to indicate that the aerosol generating device is being charged.

[0129] The following combination Figure 12 The figure shows a detailed description of the real-time voltage acquisition circuit for the power supply unit. This circuit is used to collect the voltage of the power supply unit in real time and determine the remaining power of the power supply unit. The circuit includes a seventh resistor R21 and an eighth resistor R24, which are used to divide the voltage of the power supply unit. The divided signal BAT_ADC is output to the microcontroller to maintain the microcontroller at the operating voltage. The microcontroller then determines the remaining power of the power supply unit based on the divided signal BAT_ADC.

[0130] refer to Figure 12 and Figure 9The output of the remaining power indicator signal BAT_ADC of the real-time voltage acquisition circuit of the power supply unit is connected to interface 17 of the microcontroller. The microcontroller reads the voltage output by the signal BAT_ADC to determine the remaining power of the power supply unit. For example, when the power supply unit is a battery, the remaining power of the battery is determined based on the voltage output by the remaining power indicator signal BAT_ADC.

[0131] In some embodiments, reference Figure 9 、 Figure 10 、 Figure 12 and Figure 14 When push switch S1 is pressed, the second control signal KEY is at a high level, and the microcontroller obtains the key value of push switch S1. When the key value obtained by the microcontroller is a short key value, the microcontroller 17 interface outputs the remaining power indication signal BAT_ADC to obtain the remaining power of the power supply unit. The microcontroller then sends a signal to the corresponding indicator circuit based on the remaining power to control the corresponding indicator to turn on or off.

[0132] The following combination Figure 13 The vibration prompt circuit is described in detail. The vibration prompt circuit is used to provide vibration feedback. The vibration circuit includes a motor B1 and a second switching element Q2. Motor B1 is connected to a power supply unit, and second switching element Q2 is connected to motor B1 and a microcontroller. Second switching element Q2 is configured to determine whether to be in an on or off state based on the microcontroller's tenth control signal VIB_EN, thereby determining whether motor B1 is vibrating.

[0133] The vibration alert circuit also includes a fourth diode connected in parallel across motor B1, a ninth resistor R18 connected in series with the motor, and a resistor R26 to prevent short circuits. In some embodiments, in this embodiment, motor B1 is connected at one end to the positive terminal of the power supply unit via the ninth resistor R18, and at the other end to the current inflow terminal of the second switching element Q2. The anode of the fourth diode D4 is connected to the current input terminal of the second switching element Q2, and the cathode is connected to the ninth resistor R18. This is used to prevent damage to the second switching element Q2 caused by the reverse electromotive force generated by the motor during the instant of circuit switching on or off. The second switching element Q2 is, for example, a metal-oxide-semiconductor field-effect transistor (MOSFET). The current outflow terminal (collector) of the second switching element Q2 is connected to the motor, the current outflow terminal (emitter) is grounded, and the base of the second switching element Q2 is connected to the I2C port of the microcontroller.

[0134] refer to Figure 9When the tenth control signal VIB_EN of the microcontroller interface 14 is high, the second switch element Q2 is turned on. Current flows from the positive terminal of the power supply unit through the ninth resistor R18, through the motor B1, through the second switch element Q2, and into the ground terminal CGND, causing the motor to vibrate. When the tenth control signal VIB_EN is low, the second switch element Q2 is turned off, and no current flows through the motor B1, causing the motor to stop vibrating. In some embodiments, the motor is, for example, a linear motor.

[0135] In a second aspect, the present invention provides an aerosol generating device comprising the above-mentioned heating circuit.

[0136] The adoption of the above technical solution can improve the stability of the power supply inside the aerosol generating device and increase the endurance of the power supply unit.

[0137] In a specific embodiment, Example 1 is a circuit for an aerosol generating device including a power supply auxiliary unit. The circuit structure adopts a heating circuit including the power supply auxiliary unit of the present application. The capacitor auxiliary unit is connected in parallel between the positive pole and the ground terminal of the power supply unit. The power supply auxiliary unit is composed of three capacitors with the same capacitance connected in parallel. The capacitance of each capacitor is 22uF, the equivalent impedance of the capacitor is 0.36mΩ, and the total capacitance of the power supply auxiliary unit is 66uF. Comparative Example 1 is a heating circuit for an aerosol generating device without a capacitor auxiliary unit. The only difference between Example 1 and Comparative Example 1 is that Comparative Example 1 does not have a capacitor auxiliary unit. The rest of the circuit structure in the heating circuit is the same.

[0138] Table 1 Voltage drop value and instantaneous current value of the power supply unit at the startup moment of Example 1 and Comparative Example 1

[0139] name Voltage drop value (mV) Instantaneous current value (A) Example 1 337.5 5.84 Comparative Example 1 387.5 5.92

[0140] At the moment the aerosol generating device was activated, the voltage across the power supply unit of Example 1 dropped by 337.5 mV, while the voltage across the power supply unit of Comparative Example 1 dropped by 387.5 mV. The smaller voltage drop across the power supply unit of Example 1 demonstrates that the auxiliary power supply unit of the present invention can effectively stabilize the voltage across the power supply unit and suppress sudden voltage drops.

[0141] At the moment the aerosol generating device is activated, the instantaneous current value of the power supply unit in Example 1 is 5.84A, while the instantaneous current value of the power supply unit in Comparative Example 1 is 5.92A. The instantaneous current value generated by Example 1 at the moment the aerosol generating device is activated is smaller than the instantaneous current value generated by Comparative Example 1, indicating that the auxiliary power supply unit of the present invention can reduce the output current of the power supply unit and reduce the pressure on the power supply unit to output current. Further reduction of the instantaneous current value generated by the power supply unit can be achieved by increasing the capacitance of the auxiliary power supply unit.

[0142] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above description is provided to further illustrate the present invention in conjunction with specific embodiments, and that the present invention should not be construed as being limited to these descriptions. Those skilled in the art may make various changes in form and detail, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A heating circuit for an aerosol generating device, characterized in that: include: A heating unit, wherein the conductive structure of the heating unit includes a material with a positive temperature coefficient; a power supply protection unit configured to protect the power supply unit of the aerosol generating device; a power supply auxiliary unit connected to the power supply protection unit, the power supply auxiliary unit being configured to store part of the electric energy from the power supply unit when the aerosol generating device is in a shutdown state, and to release the electric energy stored in the power supply auxiliary unit within a first time length after the aerosol generating device starts heating; An electric power control unit is respectively connected to the power supply auxiliary unit, the power supply protection unit, and the heating unit of the aerosol generating device. The electric power control unit is configured to transmit the first electric energy and the second electric energy to the heating unit within the first time length to realize electric-thermal conversion, wherein the first electric energy is the electric energy directly from the power supply unit, and the second electric energy is the electric energy released by the power supply auxiliary unit.

2. The heating circuit according to claim 1, wherein: The power supply auxiliary unit includes at least two capacitors, the capacitance of the capacitors is 16uF-500uF, and the equivalent impedance of the capacitors is 0-0.5mΩ.

3. The heating circuit according to claim 2, wherein: The power supply auxiliary unit includes three capacitors connected in parallel, the capacitance of the capacitors is 22uF, and the equivalent impedance of the capacitors is 0.36mΩ.

4. The heating circuit according to claim 1, wherein: The electric power control unit comprises: a switch processor connected to the heating unit; A first switching element is connected to the switching processor and the microcontroller of the aerosol generating device, wherein the first switching element is configured to determine whether the first switching element is in an on state or an off state according to an eleventh control signal of the microcontroller, and the switching processor is configured to determine whether the electric power control unit transmits the first electric energy and / or the second electric energy to the heating unit according to the state of the first switching element.

5. The heating circuit according to claim 4, characterized in that Also includes: When the eleventh control signal is at a high level, the first switch element is in an on state, the switch processor is in an on state, the electric power control unit transmits the first electric energy and / or the second electric energy to the heating unit, and the heating unit generates heat; When the eleventh control signal is at a low level, the first switching element is in an off state, the switch processor is in an off state, the electric power control unit does not transmit the first electric energy and / or the second electric energy to the heating unit, and the heating unit does not generate heat.

6. The heating circuit according to claim 1, wherein: Also includes: Button circuit; a low-dropout voltage regulator circuit connected to the key circuit and the microcontroller of the aerosol generating device; The low-voltage difference regulator circuit is configured to determine whether the low-voltage difference regulator circuit is activated to output voltage based on the on-off state of the key circuit when the aerosol generating device is in the off state, so that the internal logic circuit of the aerosol generating device is in the working state; wherein, the internal logic circuit is controlled by the microcontroller, and the internal logic circuit includes at least one or more of a heating unit temperature measurement circuit, a power supply unit real-time voltage acquisition circuit, a vibration prompt circuit, an external power supply detection circuit, an indicator light circuit, a connector circuit and a charging management circuit.

7. The heating circuit according to claim 6, characterized in that The low-voltage dropout regulator circuit is configured to determine whether to be activated according to a plurality of control signals adopting a wired-OR relationship, and when any one or more of the control signals are at a high level, the low-voltage dropout regulator circuit is activated; When all the control signals are at a low level, the low-dropout voltage regulator circuit is not activated; The plurality of control signals include at least a first control signal, and the first control signal is configured to determine whether it is a high level or a low level according to the on / off state of the key circuit when the aerosol generating device is in the off state.

8. The heating circuit according to claim 7, wherein: The key circuit includes a key switch, After the key switch is pressed, the key circuit is closed, the first control signal and the second control signal are at a high level, and the second control signal is configured so that when the second control signal is at a high level, the microcontroller can obtain the key value of the key switch through the second control signal to determine the output signal of the microcontroller; The key value includes a long key value and a short key value. The microcontroller is configured to determine whether the eleventh control signal output by the microcontroller is a high level or a low level according to the long key value and whether the aerosol generating device is in a shutdown state or a heating state, and the microcontroller outputs a real-time voltage acquisition signal of the power supply unit according to the short key value, and then outputs a remaining power indication signal.

9. The heating circuit according to claim 8, wherein the plurality of control signals further comprise a third control signal and a fourth control signal, wherein: The microcontroller is configured so that after the low-dropout voltage regulator circuit is activated by pressing the key switch, the microcontroller sets the third control signal to a high level; the fourth control signal is configured so that after receiving an external power supply signal, the fourth control signal is at a high level.

10. The heating circuit according to claim 1, wherein: The power supply protection unit includes: a fifth processor, wherein an input end of the fifth processor is connected to the positive electrode of the power supply unit, and an output end of the fifth processor is connected to the negative electrode of the power supply unit; The sixth processor is connected in series with the heating unit, wherein: The fifth processor is configured to determine the voltage of the power supply unit and the current flowing through the sixth processor. When the detected value of the voltage of the power supply unit is less than the over-discharge threshold or greater than the overvoltage threshold, or the detected value of the current flowing through the sixth processor is greater than the overcurrent threshold, the sixth processor is instructed to disconnect, no current loop is formed, and the heating unit does not generate heat.

11. The heating circuit according to claim 6, wherein: The heating unit temperature measurement circuit includes: A temperature measuring element, fixedly connected to the heating unit; A second processor is connected to the temperature measuring element and the microcontroller. The second processor is configured to amplify the signal captured by the temperature measuring element to form an amplified signal, and output the amplified signal to the microcontroller, so that the microcontroller determines the temperature measurement value of the heating unit according to the amplified signal.

12. The heating circuit according to claim 11, wherein: The temperature measuring element includes a thermocouple, The second processor includes: A first input interface, configured to receive a negative electrode signal from the thermocouple; A second input interface, used to receive a positive signal from the thermocouple; A power supply interface, used for receiving an output voltage from a low-dropout voltage regulator circuit; A cold junction compensation interface, used to compensate for errors caused by changes in the cold junction temperature of the thermocouple; The first output interface and the second output interface are connected to the microcontroller and are used to output the amplified signal to the microcontroller.

13. The heating circuit according to claim 6, wherein: The charging management circuit includes: a fourth processor, configured to manage charging of the power supply unit and output a charging status signal to the microcontroller, wherein the charging status signal is configured to indicate a current charging status; A power supply unit temperature measurement circuit, comprising a first thermistor; The current limiting circuit includes a fourth resistor, wherein The fourth processor is configured to determine whether to charge the power supply unit based on whether the voltage of the first thermistor exceeds a preset voltage threshold, and the fourth processor determines whether to adjust the current based on whether the current flowing through the fourth resistor is a constant current, and the fourth processor determines whether to switch from a constant current charging mode to a constant voltage charging mode based on whether the voltage of the power supply unit reaches a full-charge voltage.

14. The heating circuit according to claim 11, wherein: The connector circuit includes a third connector, the third connector including: A power bus interface, used to provide an adapter interface for an external power source to charge the power supply unit; a fifth signal interface configured to transmit a fifth signal from an external device to the microcontroller of the aerosol generating device when the microcontroller of the aerosol generating device is burning a program; a sixth signal interface configured to transmit a sixth signal from the external device to the microcontroller of the aerosol generating device; a seventh signal interface configured to transmit a seventh signal from the microcontroller of the aerosol generating device to the external device; The microcontroller is configured to receive temperature calibration data according to the sixth signal, calibrate the temperature measurement value of the heating unit according to the temperature calibration data, and finally feedback to the external device whether the calibration is completed through a seventh signal; Alternatively, the microcontroller is configured to receive temperature control data according to the sixth signal, and then modify the temperature control algorithm inside the microcontroller according to the temperature control data, and finally feedback to the external device via a seventh signal whether the modification is completed.

15. The heating circuit according to claim 6, wherein: It also includes an indicator light circuit, which is configured to indicate one or more of the working status, charging status and remaining power information of the aerosol generating device. The indicator light circuit includes several indicator lights, one end of each of the indicator lights is connected to the output voltage end of the low-voltage difference regulator circuit, and the other end of the indicator light is connected to the microcontroller through a resistor. The indicator light is configured to determine whether it is lit based on whether the microcontroller outputs a high level or a low level.

16. The heating circuit according to claim 6, wherein: The external power supply detection circuit includes: The fifth resistor and the sixth resistor are used to divide the voltage of the external power supply, and the divided signal is output to the microcontroller to keep the microcontroller at the operating voltage. The microcontroller determines whether the external power supply is connected according to whether the divided signal is high or low. When the external power supply is connected, the microcontroller sets the eleventh control signal to a low level to stop the heating unit from heating. The microcontroller outputs a control signal to the indicator light circuit to indicate the charging status.

17. The heating circuit according to claim 6, wherein: The real-time voltage acquisition circuit of the power supply unit includes: a seventh resistor and an eighth resistor, which are used to divide the voltage of the power supply unit, and output the divided signal to the microcontroller to keep the microcontroller at the working voltage, and determine the remaining power of the power supply unit based on the divided signal.

18. The heating circuit according to claim 6, wherein: The vibration prompt circuit includes: a motor connected to the power supply unit, A second switching element is connected to the motor and the microcontroller, wherein the second switching element is configured to determine whether it is in an on state or an off state according to a tenth control signal of the microcontroller, thereby determining whether the motor vibrates.

19. An aerosol generating device, characterized in that: The heating circuit comprises the heating circuit according to any one of claims 1 to 18.

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