Aerosol generating device and heating circuit used for aerosol generating device

Abstract

The invention provides a heating circuit for an aerosol generating device, and the heating circuit comprises a heating unit of which the conductive structure 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 invention 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 invention 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 increase the current value flowing through the heating unit, and put forward 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 starting 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 starting 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 the cable length, increasing the cable diameter or using materials with lower resistivity to reduce line losses and increase the power supplied to the aerosol generating device. However, these methods have certain limitations in practical applications because they still rely on the discharge capacity of the power supply unit itself. When the discharge capacity of the power supply unit is insufficient, the effectiveness of these measures will be greatly reduced and the expected heating effect cannot be achieved.

[0004] In addition, the instantaneous high current will cause a sudden change in the voltage of the power supply unit, which will in turn affect the power supply stability of the control unit and reduce the overall endurance of the aerosol generating device. To address this problem, existing technical means have not yet found a solution that can both increase the heating speed and reduce 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 that the battery discharge capacity is insufficient at the moment of starting the aerosol generating device, which affects the normal use of the aerosol generating device.

[0006] The prior art uses a battery to directly power an aerosol generating device. However, the power supply unit has insufficient discharge capacity when the aerosol generating device is started, and the voltage at both ends of the power supply unit is pulled down. The problem of poor power supply stability inside the aerosol generating device has not been effectively solved. Summary of the invention

[0007] The purpose of the present invention 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 present invention 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 auxiliary power supply 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 invention, it 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 switch 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 according to the on-off 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 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 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.

[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 a number of control signals using a line-OR relationship, and 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 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, and when the detection value of the voltage of the power supply unit is less than the over-discharge threshold or greater than the over-voltage threshold, or the detection value of the current flowing through the sixth processor is greater than the over-current 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 pole signal from the thermocouple; a second input interface for receiving a positive pole 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 the 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, which is used to provide an adapter interface for an external power source to charge the power supply unit; a fifth signal interface, which is configured to transmit a fifth signal from an external device to the microcontroller when the microcontroller of the aerosol generating device burns a program; a sixth signal interface, which is configured to transmit a sixth signal from an external device to the microcontroller of the aerosol generating device; a seventh signal interface, which is 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 a plurality of 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 according to whether the microcontroller outputs a high level or a low level.

[0024] According to another specific embodiment of the present invention, 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 according to 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 a working voltage, and the remaining power of the power supply unit is determined according to 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, and 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 internal power supply of the aerosol generating device and improve the endurance of the power supply unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 An internal block diagram of an aerosol generating device in an embodiment of the present invention is shown;

[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 charging management circuit of an aerosol generating device in an embodiment of the present invention;

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

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

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

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

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

[0039] Fig.11 A circuit diagram showing an external power supply detection circuit of an aerosol generating device in an embodiment of the present invention;

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

[0041] Fig.13A circuit diagram showing a vibration prompt circuit of an aerosol generating device in an embodiment of the present invention;

[0042] Fig.14 A circuit diagram showing a key circuit of an aerosol generating device in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The following specific embodiments illustrate the implementation of the present invention, and 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 invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include 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 the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[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 and explained in the subsequent drawings.

[0045] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in 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 the 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 stage 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 caused by insufficient discharge capacity of the power supply unit can be avoided at the moment of starting the aerosol generating device, thereby improving the stability of the power supply inside the device.

[0047] like Figure 1As shown, in the first aspect, the present invention 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. Among them, the power supply protection unit is configured to protect the power supply unit of the aerosol generating device (for example, 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 a shutdown 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 the 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, shredded tobacco, reconstituted tobacco, etc.

[0049] Furthermore, after the first time length ends, the temperature of the heating unit rises, and the resistance of the heating unit increases accordingly, and 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 present invention can prevent overcurrent or over-discharge protection caused by the startup moment. The heating circuit of the present invention 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 whose conductive material is a negative temperature coefficient has a high resistance at room temperature, and its 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 rate in the preheating stage; while 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 time after the aerosol generating device starts heating, there are two paths for supplying power to the heating unit. One is directly from the power supply unit 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 to achieve electric-thermal conversion.

[0051] The above technical solution can avoid insufficient discharge capacity of the power supply unit (such as a battery) when 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, the capacitance of the capacitor is 16uF-500uF, and the equivalent impedance of the capacitor is 0-0.5mΩ. The capacitance of the power supply auxiliary unit as a whole is 32uF-1000uF, and the equivalent impedance of the power supply auxiliary unit as a whole is 0-0.25mΩ. With the above technical solution, the power supply auxiliary unit can provide sufficient electrical energy to the power control unit at the moment of starting the aerosol generating device, and then transfer it to the heating unit for electric heat conversion.

[0053] In some embodiments, Figure 7 As shown, 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. The above technical solution can save costs, simplify the circuit structure, and miniaturize the aerosol generating device while ensuring power supply stability.

[0054] like Figure 6 As shown, in some embodiments, the electric 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 the microcontroller. The microcontroller controls the closing and opening of the first switch element Q1 to make the switch processor M2 in an on state or an off state, so that the heating unit is in an operating state or a non-operating state.

[0055] In some embodiments, the first switch 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 switch element Q1 can determine whether it is in a closed state or an open state according to the 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 according to the state of the first switch element Q1, thereby determining whether the electric power control unit transmits the first electric energy and / or the second electric 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 a working state. Specifically, the current flows out from the power supply unit, for example, from Figure 6 The battery positive electrode B+ shown in FIG. 1 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 at a low level, the first switch element Q1 is in an off state, its collector is at a high level, the interface 3 of the switch processor M2 is at a high level, the switch processor M2 is in an 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-working state, and the heating unit stops heating.

[0058] Continue to refer Figure 6 The eleventh resistor R9 is used to prevent the positive electrode B+ of the power supply unit from being directly grounded when the first switch element Q1 is turned on, causing a short circuit in the circuit. The tenth resistor R13 is used to prevent the eleventh control signal H_EN from being directly grounded when it is at a high level to avoid 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 switch element Q1. One end of the tenth resistor R13 is connected to the base of the first switch element Q1, and the other end is connected to the ground terminal.

[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 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 electric power control unit and the heating unit to perform 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 at both ends of the power supply unit and perform overvoltage or over-discharge protection on the power supply unit.

[0063] like Figure 6 As shown in FIG. 1 , when the heating is turned on, the current from the positive electrode 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 reaching 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 according to 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 recognizes 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, so that the sixth processor M1 is disconnected, a current loop is not 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 over-voltage threshold, the sixth processor M1 is instructed 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, 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 over-voltage protection is performed, when the fifth processor detects an over-voltage signal, that is, the voltage of the power supply unit is higher than the preset over-voltage 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. 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. Prevent the power supply unit from overvoltage, and avoid damage to the power supply unit or safety hazards due to overvoltage. 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 short circuits. When the circuit exceeds the set safety range of voltage or current, the power supply protection unit interrupts the current flow to protect related circuits and components.

[0068] In the prior art, at the moment of starting, the temperature of the heating unit of the aerosol generating device is low, and the resistance of the heating unit is small, which will generate a momentary large current and cause the overcurrent / over-discharge protection of the power supply protection unit. In the present invention, due to the existence of the power supply auxiliary unit, at the moment of starting, the power supply auxiliary unit releases the electric energy stored therein to the electric power control unit and then transmits it to the heating unit, which relieves the pressure of the power supply unit output current, and the power supply unit will not output a momentary large current, and the voltage at both ends of the power supply unit will not drop excessively, which will not cause the overcurrent / over-discharge protection of the power supply protection unit, thereby avoiding the interruption of heating caused by this and improving the stability of the power supply of 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 supply 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 voltage difference 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 turned off, a part of the energy is stored in the power supply auxiliary unit from the power supply unit. The power supply unit and the power supply auxiliary unit jointly provide electric energy to the electric power control unit, which is transmitted to the heating unit for electric-heat conversion, and then transmitted 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, the charging management unit and the 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 access 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 transmitted 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 a 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 on the heating unit, and the temperature measuring circuit of the heating unit transmits the signal detected by the temperature measuring element to the microcontroller, and the microcontroller determines the temperature measurement value of the heating unit according to the signal. The key unit is connected to the microcontroller, and the microcontroller determines whether the power control unit transmits electric energy to the heating unit or controls the display unit to display the remaining power information of the power supply unit according to 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, when the key unit is in the on state, the low-dropout voltage regulator unit is activated to output voltage, so that the internal logic circuit of the aerosol generating device is in the working state. The internal logic circuit is controlled by the microcontroller and includes at least one or more of 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 FIG. 4 is a circuit diagram of a low-dropout voltage regulator circuit of an aerosol generating device in an embodiment of the present invention. Fig.14 FIG. 1 is a circuit diagram of a key circuit of an aerosol generating device in an embodiment of the present invention. Figure 5 and Fig.14 The heating circuit of the aerosol generating device also includes a key circuit and a low dropout regulator (Low Dropout Regulator, LDO) circuit.

[0077] refer to Figure 5 and Fig.14 The low-dropout voltage regulator circuit includes a first chip U3. The first enable terminal 3 interface of the first chip U3 is connected to the key circuit through the first diode D1. The first chip U3 is connected to the positive electrode of the power supply unit through the 4 interface IN, and the first chip U3 outputs a voltage through the 1 interface OUT, so that the internal logic circuit of the aerosol generating device is in a working state. Specifically, the voltage is, for example, 3V.

[0078] Specifically, refer to Fig.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 turned on, and the key circuit is closed. At this time, the first control signal LDO_EN1 is at a high level. Figure 5 The 3 interface EN of the first chip U3 is at a high level, the first chip U3 outputs a voltage (3V) from the 1 interface OUT, and the internal logic circuit of the aerosol generating device is in working state. 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 supply detection circuit, the indicator light circuit, the connector circuit and the charging management circuit is in working state.

[0079] In some embodiments, the key circuit is connected to the low-dropout regulator circuit via a first control signal LDO_EN1, and the first control signal LDO_EN1 is configured to determine whether the low-dropout regulator circuit is activated by determining whether it is at 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. When the key circuit is turned on (closed), the low-dropout regulator circuit is activated. When the key circuit is turned off, the low-dropout regulator circuit is not activated.

[0080] In some embodiments, when the aerosol generating device is in the shutdown state, after the key switch S1 is pressed, the key circuit is closed, the first control signal LDO_EN1 and the second control signal KEY are high level, the low voltage difference regulator circuit is activated, and the output voltage is used to start 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 according to the key value. The key switch S1 has different key values, and different key values ​​correspond to different functions of the aerosol generating device. For example, a long key value corresponds to turning on or off the aerosol generating device, and a short key value corresponds to displaying the remaining power of the aerosol generating device. The microcontroller determines whether the microcontroller outputs the eleventh control signal H_EN at a high level or a 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 power supply unit real-time voltage acquisition signal BAT_ADC according to the short key value. Specifically, when the key value is a long key value and the aerosol generating device is in the shutdown state, the microcontroller outputs the eleventh control signal H_EN at a high level, the electric power control unit is turned on, and the heating unit is in the working state. When the key value is a long key value and the aerosol generating device is in a heating state, the microcontroller outputs the eleventh control signal H_EN as a low level, the electric power control unit is disconnected, and the heating unit stops working. When the key value is a short key value, 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, and outputs it to the display unit according to the remaining power of the power supply unit to indicate the remaining power information. And the third control signal LDO_EN2 is controlled to be 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 the heating circuit or turning 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 shutdown state, the eleventh control signal H_EN output by the microcontroller is high, 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 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 the eleventh control signal H_EN as a low level, so that 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 regulator circuit is disconnected, and the internal logic circuit is in the non-working state.

[0082] When the key value is a short key value, 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. The microcontroller sends a high level or low level signal to the corresponding indicator light circuit according to the remaining power to control the corresponding indicator light to turn off or on.

[0083] In some embodiments, reference Figure 5 The low-dropout voltage regulator is configured to use a plurality of control signals using a wired-OR relationship to determine whether to activate the low-dropout voltage regulator circuit. When any one or more control signals are at a high level, the low-dropout voltage regulator circuit is activated and in a working state. When all control signals are at a low level, the low-dropout voltage regulator circuit is not activated. Among them, the plurality of control signals at least include a first control signal LDO_EN1. The first control signal LDO_EN1 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 a shutdown state.

[0084] The plurality of control signals at least include 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 the low-dropout voltage regulator circuit according to whether the key switch S1 is turned on or off. The third control signal LDO_EN2 is controlled by the microcontroller and is used to keep the low-dropout voltage regulator circuit turned on or off.

[0085] Specifically, the microcontroller is configured such that after the low-dropout voltage regulator circuit is activated by pressing the key switch S1, the microcontroller works, and the microcontroller outputs the third control signal LDO_EN2 as a high level to keep the low-dropout voltage regulator circuit working continuously. The aerosol generating device can maintain the output voltage of the low-dropout voltage regulator circuit under the control of the microcontroller without pressing the key switch S1 all the time.

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

[0087] When the aerosol generating device needs to be turned off, when the key switch S1 is long pressed, the microcontroller sets the third control signal LDO_EN2 to a low level. Because the aerosol generating device is not in a charging state at this time, the fourth control signal 5VDC is also at a low level. Since the first control signal LDO_EN1 is also at a low level after the key switch S1 is released, the enable interface 3 of the first chip U3 is at a low level, and the first chip U3 stops outputting voltage, thereby reducing the power consumption when the aerosol generating device is turned off. At the same time, the microcontroller output H_EN is at a low level, the power control unit is disconnected, no current loop is formed, and the heating unit does not generate heat.

[0088] According to another specific embodiment of the present invention, Fig.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 dropout 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, so as to avoid the aerosol generating device 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, so as to avoid 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 role 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, the low-dropout voltage 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 play a role in preventing the reverse flow of current, protecting the components in the circuit, and improving the stability of the circuit structure. The first control signal LDO_EN1 is input from the key circuit through the first diode 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 to reach 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, and are 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 Fig.14 When the aerosol generating device is turned off, the user presses the key switch S1, and the first control signal LDO_EN1 is at a high level. Figure 5 In the embodiment, the first control signal LDO_EN1 is at a high level, the first chip U3 outputs a voltage (for example, 3V), and the internal logic circuit is turned on. At this time, the microcontroller is turned on, and the microcontroller outputs a third control signal LDO_EN2 to control the first chip U3 to be continuously turned on, and the internal logic circuit is continuously turned on until the microcontroller sets the third control signal LDO_EN2 low.

[0093] When the fourth control signal 5VDC is at a high level, that is, 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 a working state. For example, the microcontroller outputs a signal to the indicator light circuit of the display unit, and the indicator light circuit indicates that it is in a charging state.

[0094] With the above technical solution, the output voltage of the low-dropout regulator circuit can be maintained by pressing the key switch S1 once. When the first control signal LDO_EN1, the third control signal LDO_EN2 and the fourth control signal 5VDC are all at low levels, the EN pin of U3 will also be at a low level, the LDO regulator stops outputting voltage, and the internal logic circuit stops working, thereby reducing standby power consumption. This design helps to shut down the internal logic circuit when the aerosol generating device is turned off, thereby minimizing power consumption.

[0095] The following combination Figure 8 The temperature measurement circuit of the heating unit is specifically introduced. A temperature measuring element (such as a thermocouple) is fixed on the heating unit. For example, the thermocouple is a K-type thermocouple P2. The thermocouple is fixed on 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, and 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 it to the microcontroller, and the microcontroller determines the temperature measurement value of the heating unit according to the amplified signal K_TEMP.

[0097] Specifically, the second processor U4 is an amplifier chip for the temperature measuring element signal, which is used to amplify the signal captured by the temperature measuring element. Since the voltage signal generated by the temperature measuring element is very weak, usually only at the millivolt level or even lower, the signal needs to be amplified by the second processor U4 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 pole signal from the thermocouple. The second input interface IN+ is used to receive the positive pole signal from the thermocouple. The cold end compensation interface VSS- is used to compensate for the error caused by the change of the cold end temperature of the thermocouple. The power supply interface VSS+ is used to receive the output voltage from the low voltage drop regulator circuit. The first output interface SENSE and the second output interface OUT are connected to the microcontroller 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, and 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 according to the thermocouple signal-temperature table stored inside it.

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

[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 Fig. 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, and after being corrected and amplified inside 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 end compensation terminal VSS-. Capacitor C10 plays the role of stabilizing the output voltage of the low voltage difference regulator circuit. Capacitor C11 and capacitor 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 circuit.

[0102] The following combination Figure 2 The connector circuit is specifically introduced. The connector circuit includes a third connector J1, which is used to manage and control the charging and data transmission functions of the Universal Serial Bus (USB) Type-C interface. The third connector J1 includes: a power bus interface VBUS, a first configuration channel CC1 and 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 forward or reversely. 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, which are used for high-speed data transmission. The seventh signal TXD interface SBU is configured to transmit the seventh signal TXD from the microcontroller of the aerosol generating device to the external device. The interface SBU comprises 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 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 Fig. 9, the SWIO signal is transmitted from the first interface DP1 and the second interface DP2 of the third connector J1 to R34, converted into a SWMIO signal, and communicates with the 5 interface of the microcontroller. The RXD signal is transmitted from the third interface DN1 and the fourth interface 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 interface of the microcontroller. The 22 interface of the microcontroller outputs a DSCK signal, which is converted into the seventh signal TXD through a second current limiting resistor (not shown), and communicates with the external device from the fifth interface SBU1 and the sixth interface SBU2 of the third connector J1. Among them, the 8 interface of the microcontroller is connected to the positive electrode of the output voltage of the low-voltage difference regulator circuit through the first pull-up resistor R27, which is used to keep the 8 interface of the microcontroller at a high level when in an idle state, improve the anti-interference ability of the interface, and avoid bit errors. The interface 22 of the microcontroller is connected to the positive electrode of the output voltage of the low-dropout regulator circuit through a second pull-up resistor R19, so as to keep the interface 22 of the microcontroller at a high level in an idle state, thereby improving the anti-interference capability of the interface and avoiding bit errors.

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

[0109] By adopting 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 and provide a communication function for the aerosol generating device.

[0110] The following combination Fig.11 The external power supply detection circuit is specifically introduced. The external power supply detection circuit includes: a fifth resistor R20 and a sixth resistor R23, which are used to divide the external power supply, and the divided signal 5VIN is output to the microcontroller to make the microcontroller at the working voltage, and determine whether the external power supply is connected according to whether the divided signal 5VIN is high or low. Specifically, the resistance ratio of the fifth resistor R20 and the sixth resistor R23 is greater than or equal to 2:3, and is used to divide the external power supply so that the divided signal 5VIN does not exceed the working voltage of the microcontroller.

[0111] exist Fig. 9 In the embodiment, the eighth signal 5VIN is input to the interface 16 of the microcontroller. Specifically, according to Fig. 9 and Fig.11 , one end of the external power detection circuit is connected to the positive electrode 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, and the fifth resistor R20 and the sixth resistor R23 are used for voltage division, so that the eighth signal 5VIN connected to the microcontroller is within the operating voltage range of the microcontroller. When the external power supply 5V is connected, the eighth signal 5VIN is at a high level, and the microcontroller recognizes that the eighth signal 5VIN is at a high level, and the aerosol generating device enters the charging state. The microcontroller sets the eleventh control signal H_EN to a low level to stop the heating unit from heating. At the same time, the microcontroller outputs a control signal to the indicator light circuit, and the corresponding indicator light is turned on or off to indicate the charging status.

[0112] When no external power source is connected, the eighth signal 5VIN is at a low level, and 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 specifically introduced. 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 3, the fourth processor U2 is configured to manage the charging of the power supply unit and output the charging status signal STAT to the microcontroller, and 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 and in series with a third resistor R1, which 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 is disconnected, does not form a current loop, and stops charging the power supply unit; if not, the fourth processor U2 is turned on to form a current loop and charge the power supply unit. Among them, the resistance of the first thermistor R7 increases with the increase of 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, which is used to limit 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 determined by the RS interface is a constant current. Specifically, the second output interface RS interface 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 interface to the fourth resistor R8, so that the current flowing through the fourth resistor R8 is a constant current, that is, the charging current for the positive electrode B+ of the battery is a constant current. 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 plays a role in stabilizing the current output. When the current passes through the inductor L1, the inductor L1 temporarily stores electrical energy and releases electrical energy when the current drops, playing a role in filtering and stabilizing the output, so that the positive electrode B+ of the battery 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 adjusting 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 power 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 power voltage, the fourth processor U2 adopts a constant current charging mode. When the voltage across the battery is greater than or equal to the full power voltage threshold, the fourth processor U2 adopts a constant voltage charging mode.

[0119] Specifically, the fourth processor U2 supports trickle, constant current, and constant voltage charging. Among them, trickle charging is used to charge with a smaller current when the battery voltage is lower than the first charging voltage threshold to prevent large current from damaging the battery. The working principle of trickle charging is that when the fourth processor U2 detects that the battery voltage is lower than a certain threshold, the fourth processor U2 will charge by outputting a trickle current. Among them, the first charging voltage threshold is, for example, 2.8V, and the trickle current is 100mA. The battery voltage increases with the increase of the power. When the voltage across the battery is greater than or equal to the first charging voltage threshold and less than the full power voltage, U2 will switch to constant current charging mode. Constant current charging is used to charge with a constant current when the battery voltage reaches a certain level (but not full) to improve charging efficiency. The fourth processor U2 will adjust the output current according to the feedback voltage of the fourth resistor R8 to ensure current stability. This mode is usually performed when the battery voltage is low but within a safe range. For example, the current of constant current charging 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, 4.2V, the voltage across the battery in a fully charged state. 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 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 is charged, the current gradually decreases 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 to prevent the power supply unit from being dangerous due to overheating, and dynamically adjust the output voltage and current according to the detected voltage information of the power supply unit to ensure stable operation of the aerosol generating device.

[0121] refer to Figure 3 and Fig. 9 , the fourth processor U2 outputs a thirteenth control signal STAT to the microcontroller, transmits the charging status of the aerosol generating device to the microcontroller, and the microcontroller sends a signal to the indicator circuit to indicate the charging status. With the above technical solution, the aerosol generating device can indicate the charging status. The charging status is, for example, a charging status or a charging completion status.

[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 a plurality of indicator lights. One end of each indicator light is connected to the output voltage end of the low voltage dropout 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 Fig.10 The indicator light circuit is specifically introduced. 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 respectively 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 respectively 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 indicator lights, and there can also be multiple corresponding indicator light diodes, which are not limited here. For example, the first indicator light LED1 includes a first indicator light diode, a second indicator light diode, and a third indicator light diode; the second indicator light LED2 includes a fourth indicator light diode, a fifth indicator light diode, and a sixth indicator light 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 extinguished.

[0126] Specifically, when the microcontroller 4 interface outputs a low level, the 1 line of the first indicator LED1 is connected, and the current flows from the output voltage end of the low-voltage difference regulator circuit, through the first indicator diode, through the resistor R28, and reaches the low-level microcontroller 4 interface, and the first indicator diode is lit. The same principle, when the microcontroller 3 interface outputs a low level, the 3 line of the first indicator LED1 is connected, and the current flows from the output voltage end of the low-voltage difference regulator circuit, through the second indicator diode, through the resistor R29, and reaches the low-level microcontroller 3 interface, and the second indicator diode is lit. When the microcontroller 2 interface outputs a low level, the 4 line of the first indicator LED1 is connected, and the current flows from the output voltage end of the low-voltage difference regulator circuit, through the third indicator diode, through the resistor R30, and reaches the low-level microcontroller 2 interface, and the third indicator diode is lit. When the microcontroller 23 interface outputs a low level, the 1 line of the second indicator LED2 is connected, and the current flows from the output voltage end of the low-voltage difference regulator circuit, through the fourth indicator diode, through the resistor R31, to the low-level microcontroller 23 interface, and the fourth indicator diode is lit. When the microcontroller 24 interface outputs a low level, the 3 line of the second indicator LED2 is connected, and the current flows from the output voltage end of the low-voltage difference regulator circuit, through the fifth indicator diode, through the resistor R32, to the low-level microcontroller 24 interface, and the fifth indicator diode is lit. When the microcontroller 1 interface outputs a low level, the 4 line of the second indicator LED2 is connected, and the current flows from the output voltage end of the low-voltage difference regulator circuit, through the sixth indicator diode, through the resistor R33, to the low-level microcontroller 1 interface, and the sixth indicator diode is lit.

[0127] In some embodiments, the indicator light circuit may also indicate the working state 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, indicating that the aerosol generating device is being charged.

[0129] The following combination Fig.12 The figure shows a specific introduction to the real-time voltage acquisition circuit of the power supply unit. The real-time voltage acquisition circuit of the power supply unit 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 real-time voltage acquisition circuit of the power supply unit includes: a seventh resistor R21 and an eighth resistor R24, which are used to divide the voltage of the power supply unit, and the divided signal BAT_ADC is output to the microcontroller to make the microcontroller at the working voltage, and the remaining power of the power supply unit is determined according to the divided signal BAT_ADC.

[0130] refer to Fig.12 and Fig. 9The output end of the remaining power indication signal BAT_ADC of the real-time voltage acquisition circuit of the power supply unit is connected to the 17 interface of the microcontroller, and 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 according to the voltage output by the remaining power indication signal BAT_ADC.

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

[0132] The following combination Fig.13 The vibration prompt circuit is specifically introduced. The vibration prompt circuit is used to provide vibration feedback. The vibration circuit includes: a motor B1 and a second switch element Q2. The motor B1 is connected to the power supply unit, and the second switch element Q2 is connected to the motor B1 and the microcontroller. The second switch element Q2 is configured to determine whether it is in the on state or the off state according to the tenth control signal VIB_EN of the microcontroller, thereby determining whether the motor B1 vibrates.

[0133] The vibration prompt circuit also includes a fourth diode connected in parallel at both ends of the motor B1, a ninth resistor R18 connected in series with the motor, and a resistor R26 to prevent short circuit. In some embodiments, in this embodiment, the motor B1 is connected to the positive electrode of the power supply unit through the ninth resistor R18 at one end, and is connected to the current inflow end of the second switch element Q2 at the other end. The anode of the fourth diode D4 is connected to the current input end of the second switch element Q2, and the cathode is connected to the ninth resistor R18, which is used to suppress the reverse electromotive force generated by the motor at the moment of circuit conduction or closing to damage the second switch element Q2. The second switch element Q2 is, for example, a metal-oxide-semiconductor field-effect transistor (MOSFET), the current outflow end (collector) of the second switch element Q2 is connected to the motor, the current outflow end (emitter) is grounded, and the base of the second switch element Q2 is connected to the 14 interface of the microcontroller.

[0134] refer to Fig. 9When the tenth control signal VIB_EN of the microcontroller interface 14 is high, the second switch element Q2 is turned on, and the current starts from the positive electrode of the power supply unit, passes through the ninth resistor R18, flows through the motor B1, flows through the second switch element Q2, and flows into the ground terminal CGND, and the motor vibrates. When the tenth control signal VIB_EN is low, the second switch element Q2 is turned off, no current flows through the motor B1, and the motor stops 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 internal power supply of the aerosol generating device and improve the endurance of the power supply unit.

[0137] In a specific embodiment, Example 1 is a circuit of an aerosol generating device including a power supply auxiliary unit. The circuit structure adopts a heating circuit including the power supply auxiliary unit in 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 3 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 of 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, and the rest of the circuit structures in the heating circuit are 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 of starting the aerosol generating device, the voltage across the power supply unit of Example 1 dropped by 337.5 mV, and the voltage across the power supply unit of Comparative Example 1 dropped by 387.5 mV. The voltage drop across the power supply unit of Example 1 is small, indicating that the power supply auxiliary unit of the present invention can effectively stabilize the voltage across the power supply unit and suppress the amplitude of the sudden voltage drop.

[0141] At the moment of starting the aerosol generating device, the instantaneous current value of the power supply unit in Example 1 is 5.84A, and the instantaneous current value of the power supply unit in Comparative Example 1 is 5.92A. At the moment of starting the aerosol generating device, the instantaneous current value generated by Example 1 is smaller than the instantaneous current value generated by Comparative Example 1, indicating that the power supply auxiliary unit of the present invention can reduce the output current of the power supply unit and reduce the pressure of the output current of the power supply unit. If the magnitude of the instantaneous current value generated by the power supply unit needs to be further reduced, it can be achieved by increasing the capacitance of the power supply auxiliary 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 is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several 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 comprises a material with a positive temperature coefficient; a power supply protection unit configured to protect a 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, and 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, characterized in that: 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, characterized in that: 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, characterized in that: The electric power control unit comprises: A switch processor connected to the heating unit; A first switch element is 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.

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, characterized in that: 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 according to the on-off 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 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-dropout voltage regulator circuit is configured to determine whether to be activated according to a plurality of control signals using a wired-OR relationship, and when any one or more of the control signals are at a high level, the low-dropout voltage regulator circuit is activated; When all the control signals are at a low level, the low dropout regulator circuit is not activated; Among them, the several 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, characterized in that: 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 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 the 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.

10. The heating circuit according to claim 1, characterized in that: The power supply protection unit comprises: 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 over-voltage threshold, or the detected value of the current flowing through the sixth processor is greater than the over-current 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, characterized in that: The heating unit temperature measurement circuit comprises: A temperature measuring element, fixedly connected to the heating unit; The 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, characterized in that The temperature measuring element comprises a thermocouple, The second processor comprises: A first input interface, used to receive a negative pole 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 voltage dropout 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, characterized in that: The charging management circuit comprises: a fourth processor, configured to perform charging management on 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 according to whether the voltage of the first thermistor exceeds a preset voltage threshold, and the fourth processor determines whether to adjust the current according to 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 according to whether the voltage of the power supply unit reaches a full-charge voltage.

14. The heating circuit according to claim 11, characterized in that: The connector circuit includes a third connector, and the third connector includes: 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 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; 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; 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 whether the modification is completed through the seventh signal.

15. The heating circuit according to claim 6, characterized in that: 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 a plurality of 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 according to whether the microcontroller outputs a high level or a low level.

16. The heating circuit according to claim 6, characterized in that: The external power supply detection circuit comprises: The fifth resistor and the sixth resistor are used to divide the voltage of the external power supply. The divided signal is output to the microcontroller to keep the microcontroller at the working voltage, and whether the external power supply is connected is determined according to whether the divided signal is at a high level or a low level. 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, and the microcontroller outputs a control signal to the indicator light circuit to indicate the charging status.

17. The heating circuit according to claim 6, characterized in that: 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 a working voltage, and the remaining power of the power supply unit is determined according to the divided signal.

18. The heating circuit according to claim 6, characterized in that: The vibration prompt circuit comprises: a motor connected to the power supply unit, A second switch element is connected to the motor and the microcontroller, wherein the second switch 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 invention comprises a heating circuit as claimed in any one of claims 1 to 18.

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