Load detection circuit and aerosol-generating device

Abstract

The embodiment of the utility model discloses a load detection circuit and an aerosol generation device. The load detection circuit comprises a power supply; the first switching circuit is electrically connected between the positive electrode of the power supply and the load; the second switching circuit is electrically connected between the negative electrode of the power supply and the load; the third switching circuit is electrically connected between the negative electrode of the power supply and the load; the first resistor is provided with a first connecting end and a second connecting end, the first electric connecting end is electrically connected with the load, the second connecting end is electrically connected with the third switching circuit, and the first resistor is connected with the third switching circuit in series and connected with the second switching circuit in parallel; the voltage detection circuit is used for detecting voltage at two ends of the first resistor; and the controller is electrically connected with the control ends of the first switching circuit, the second switching circuit and the third switching circuit respectively. Through the mode, whether the resistance value of the load is normal can be detected, and if the resistance value is normal, the power supply is controlled to provide electric energy for the load.

Description

Technical field

[0001] The present application relates to the field of hardware circuit technology, and in particular to a load detection circuit and an aerosol generating device. [Background Technology]

[0002] Electronic devices usually need to detect the load to confirm whether the load is normal. If the load is normal, the controller of the electronic device controls the supply of power to the load; if the load is abnormal, the controller of the electronic device controls the suspension of power supply to the load, thereby protecting the load. [Utility Model Content]

[0003] The present application provides a load detection circuit for detecting the resistance of a load and determining the state of the load based on the resistance of the load.

[0004] At least one embodiment of the present application provides a load detection circuit, a power supply;

[0005] a first switch circuit comprising a first input terminal and a first output terminal, wherein the first input terminal is electrically connected to the positive electrode of the power supply, and the first output terminal is electrically connected to the first terminal of the load;

[0006] a second switch circuit comprising a second input terminal and a second output terminal, wherein the second input terminal is electrically connected to the second terminal of the load, and the second output terminal is electrically connected to the negative electrode of the power supply;

[0007] a third switch circuit, comprising a third input terminal and a third output terminal, wherein the third input terminal is electrically connected to the second terminal of the load, and the third output terminal is electrically connected to the negative electrode of the power supply;

[0008] a first resistor having a first connection end and a second connection end, the first connection end being electrically connected to the second end of the load, the second connection end being electrically connected to the third input end, the first resistor being connected in series with the third switch circuit and in parallel with the second switch circuit;

[0009] a voltage detection circuit, configured to detect the voltage across the first resistor;

[0010] The controller is electrically connected to the first control end of the first switch circuit, the second control end of the second switch circuit, and the third control end of the third switch circuit respectively.

[0011] In one embodiment, there are multiple loads, the negative poles of the multiple loads are arranged in parallel, and one first switch circuit is connected between any one of the loads and the positive pole of the power supply.

[0012] In one embodiment, the first switching circuit includes at least one first NMOS transistor and at least one PMOS transistor, the gate of the first NMOS transistor is electrically connected to the controller as the first control terminal, the source of the PMOS transistor is electrically connected to the positive electrode of the power supply as the first input terminal, the drain of the PMOS transistor is electrically connected to the first terminal of the load as the first output terminal, the drain of the first NMOS transistor is electrically connected to the gate of the PMOS transistor, and the source of the first NMOS transistor is electrically connected to the reference ground.

[0013] In one embodiment, the present invention further includes a second resistor and a third resistor connected in series with the resistor, wherein a first end of the second resistor is electrically connected to the first output end, a second end of the third resistor is electrically connected to a reference ground, and an ADC sampling pin of the controller is electrically connected between the second resistor and the third resistor to collect the voltage across the third resistor.

[0014] In one embodiment, the voltage detection circuit includes a fourth resistor and a fifth resistor connected in series with the fourth resistor, the first end of the fourth resistor is electrically connected to the second end of the load, the second end of the fifth resistor is electrically connected to the reference ground, the fourth resistor and the fifth resistor are connected in series and then in parallel with the first resistor, and the ADC sampling pin of the controller is electrically connected between the fourth resistor and the fifth resistor to collect the voltage across the fifth resistor.

[0015] In one embodiment, the resistance of the fourth resistor is at least twice the resistance of the fifth resistor.

[0016] In one embodiment, the second switching circuit includes a second NMOS transistor, the gate of the second NMOS transistor is electrically connected to the controller as the second control terminal, the drain of the second NMOS transistor is electrically connected to the second terminal of the load as the second input terminal, and the source of the second NMOS transistor is electrically connected to the negative electrode of the power supply as the second output terminal.

[0017] In one embodiment, the third switching circuit includes a third NMOS transistor, the gate of the third NMOS transistor is electrically connected to the controller as the third control terminal, the drain of the third NMOS transistor is electrically connected to the second terminal of the load through the first resistor as the third input terminal, and the source of the third NMOS transistor is electrically connected to the negative electrode of the power supply as the third output terminal.

[0018] In one embodiment, a sixth resistor is connected between the gate and the source.

[0019] At least one embodiment of the present application further provides an aerosol generating device, comprising:

[0020] a chamber for containing an aerosolizable matrix material;

[0021] The load detection circuit described in the above embodiment;

[0022] Wherein, the load is a heating element, which is used to heat the matrix material to generate aerosol

[0023] The load detection circuit provided in the above embodiment detects the voltage across the first resistor by turning on the first switch circuit and the third switch circuit and turning off the second switch circuit, and calculates the resistance of the load based on the voltage across the first circuit. If the load resistance is normal, the third switch circuit is turned off, and the first switch circuit and the second switch circuit are turned on, so that the power supply provides power to the load. If the load resistance is abnormal, the second switch circuit is further turned off to prevent the power supply from providing power to the load, thereby preventing the load from operating in an abnormal state.

Brief Description of the Drawings

[0024] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0025] Figure 1 A schematic diagram of the structure of a load detection circuit provided in one embodiment of the present application;

[0026] Figure 2 A schematic diagram of the structure of a load detection circuit provided in one embodiment of the present application;

[0027] Figure 3 A schematic diagram of the structure of a load detection circuit provided in one embodiment of the present application;

[0028] Figure 4 A schematic diagram of the structure of a load detection circuit provided in one embodiment of the present application;

[0029] Figure 5 A schematic diagram of the structure of a load detection circuit provided in one embodiment of the present application;

[0030] Figure 6 A schematic diagram of the structure of a load detection circuit provided in one embodiment of the present application;

[0031] Figure 7 A schematic structural diagram of an aerosol generating device provided in one embodiment of the present application. [Specific implementation method]

[0032] In order to facilitate the understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" / "fixed to" another element, it can be directly on the other element, or one or more intermediate elements can exist therebetween. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements can exist therebetween. The terms "upper", "lower", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0034] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0035] In the embodiments of the present application, the "installation" includes fixing or restricting a component or device to a specific position or place by welding, screwing, clamping, bonding, etc. The component or device can remain stationary at a specific position or place or can move within a limited range. After the component or device is fixed or restricted to a specific position or place, it may or may not be disassembled, which is not limited in the embodiments of the present application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0037] An embodiment of the present application provides a load detection circuit, such as Figure 1As shown, the load detection circuit is applied to an electronic device, and the load detection circuit includes a controller 10, a load 20, a first switch circuit 30, a second switch circuit 40, a third switch circuit 50, a first resistor 60 and a voltage detection circuit 70. The first switch circuit 30 is electrically connected between the positive electrode of the power supply 80 and the load 20, the second switch circuit 40 is electrically connected between the load 20 and the negative electrode of the power supply 80, the third switch circuit 50 and the first resistor 60 are connected in series and then connected between the load 20 and the negative electrode of the power supply 80, and the voltage detection circuit 70 is used to detect the voltage across the first resistor 60. The first switch circuit 30, the second switch circuit 40 and the third switch circuit 50 are all electrically connected to the controller 10 of the electronic device, so that the controller 10 controls the first switch circuit 30, the second switch circuit 40 and the third switch circuit 50 to be turned on or off.

[0038] The controller can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a single-chip microcomputer, an ARM (Acorn RISC Machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Furthermore, the controller can be any conventional processor, controller, microcontroller, or state machine. The controller can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP, and / or any other such configuration.

[0039] The controller 10 includes: at least one processor; and a memory in communication with the at least one processor. The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the control method of the above embodiment. The processor and the memory can be connected via a bus or other means. The processor can be implemented by using at least one of the following: an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microcontroller, a microprocessor, or other electronic units that perform these functions.

[0040] The memory includes a high-speed random access memory and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory may optionally include a memory remotely located relative to the processor, and these remote memories may be connected to the aerosol generating device via a network. Examples of the above-mentioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The memory is used to store non-volatile software programs, non-volatile computer executable programs, and modules, such as program instructions / units corresponding to the control method / device involved in this article. The processor executes various functional applications and data processing of the aerosol generating device by running the non-volatile software programs, instructions, and units stored in the memory.

[0041] Please continue reading Figure 1 The first switch circuit 30 includes a first input terminal 31, a first output terminal 32, and a first control terminal 33. The first input terminal 31 is electrically connected to the positive electrode of the power supply 80, the first output terminal 32 is electrically connected to the first terminal of the load 20, and the first control terminal 33 is electrically connected to the controller 10. The second switch circuit 40 includes a second input terminal 41, a second output terminal 42, and a second control terminal 43. The second input terminal 41 is electrically connected to the second terminal of the load 20, and the second output terminal 42 is electrically connected to the negative electrode of the power supply 80. The third switch circuit 50 includes a third input terminal 51, a third output terminal 52 and a third control terminal 53. The first resistor 60 has a first connection terminal and a second connection terminal. The first connection terminal is electrically connected to the second terminal of the load 20, the second connection terminal is electrically connected to the third input terminal 51, the third control terminal 53 is electrically connected to the controller, and the third output terminal 52 is electrically connected to the negative pole of the power supply 80. The third switch circuit 50 and the first resistor 60 are connected in series and then connected in parallel with the first switch circuit 40. The voltage detection circuit 70 is connected between the first connection terminal of the first resistor 60 and the negative pole of the power supply 80 for detecting the voltage across the first resistor 60.

[0042] It should be noted that the negative electrode of the power supply 80 can also be considered as a reference ground, and the negative electrode of the power supply 80 and the reference ground are electrically connected.

[0043] The controller 10 turns on the first and third switch circuits 30 and 50, and turns off the second switch circuit 40. At this point, the power supply 80, the first switch circuit 30, the load 20, the first resistor 60, and the third switch circuit 50 form a series circuit. Since the internal resistance of the voltage detection circuit 70 is much greater than that of the first resistor 60, the current flowing through the voltage detection circuit 70 is very small. In other words, the power supply 80, the load 20, and the first resistor 60 form a series circuit. Based on the principle that currents in series circuits are equal, the following equation can be obtained:

[0044] V1 / (R20+R60)=V2 / R60

[0045] in:

[0046] V1 is the voltage across the power supply 80;

[0047] V2 is the voltage across the first resistor R60 measured by the voltage detection circuit 70;

[0048] R20 is the resistance value of load 20;

[0049] R60 is the resistance value of the first resistor 60;

[0050] V1 can be detected by another voltage detection circuit, and the resistance R20 of the load 20 can be calculated using the above formula. The controller compares the calculated R20 with a preset threshold. If R20 is less than the preset threshold, the controller determines that the load 20 is in an abnormal state and controls the second switch circuit 40 to remain in the off state to prevent the load 20 from operating in the abnormal state. If R20 is greater than the preset threshold, the controller determines that the load 20 is also in an abnormal state and controls the second switch circuit 40 to remain in the off state to also prevent the load 20 from operating in the abnormal state. Only when R20 is within the preset threshold range can the controller determine that the load 20 is in a normal state and controls the second switch circuit 40 to be turned on. Since the second switch circuit 40 and the third switch circuit 50 are connected in parallel, and the third switch circuit 50 and the first resistor 60 are connected in series, current forms a loop through the power supply 80, the first switch circuit 30, the load 20, and the second switch circuit 40. Substantially no current flows through the first resistor 60, and the power supply 80 essentially only provides power to the load 20.

[0051] In some embodiments, as Figure 2 As shown, the load 20 includes multiple loads 20, the negative electrodes of which are connected in parallel. A first switching circuit 30 is connected between each load 20 and the power supply 80, thereby enabling the controller to independently control the multiple loads 20. In addition, since the negative electrodes of the multiple loads 20 are connected in parallel, the second switching circuit 40, the third switching circuit 50, the first resistor 60, and the voltage detection circuit 70 can be shared by each load 20, thereby reducing the number of switching circuits used and, in turn, the manufacturing cost of the electronic device.

[0052] In some embodiments, as Figure 3As shown, the first switch circuit 30 includes at least one first NMOS transistor 30a and at least one PMOS transistor 30b. The gate (G pole) of the first NMOS transistor 30a is electrically connected to the controller 10 as the first control terminal 33 of the first switch circuit 30. The source (S pole) of the PMOS transistor 30b is electrically connected to the positive electrode of the power supply 80 as the first input terminal 31 of the first switch circuit 30. The drain (D pole) of the PMOS transistor 30b is electrically connected to the first end of the load 20 as the first output terminal 32 of the first switch circuit 30. The drain (D pole) of the first NMOS transistor is electrically connected to the gate (G pole) of the PMOS transistor. The source (S pole) of the first NMOS transistor is electrically connected to the reference ground or the negative electrode of the power supply 80.

[0053] Furthermore, when the controller 10 inputs a high level to the gate of the first NMOS transistor 30a, the first NMOS transistor is in the on state. Since the drain of the first NMOS transistor is electrically connected to the gate of the PMOS transistor, the gate of the PMOS transistor is connected to the reference ground, and the voltage of the gate of the PMOS transistor is pulled down, thereby turning on the PMOS transistor and then turning on the first switch circuit 30.

[0054] When the controller 10 inputs a low level to the gate of the first NMOS transistor 30a, the first NMOS transistor is in the off state. At this time, the potential of the PMOS transistor gate is pulled up by the resistor 90, thereby turning off the PMOS transistor and further turning off the first switch circuit 30.

[0055] In some embodiments, as Figure 4 As shown, the load detection circuit also includes a second resistor 91 and a third resistor 92, the second resistor 91 and the third resistor 92 are connected in series, one end of the second resistor 91 is electrically connected to the first output terminal 32, and one end of the third resistor 92 is electrically connected to the reference ground, and the ADC pin of the controller 10 is electrically connected between the second resistor 91 and the third resistor 92 to collect the voltage across the third resistor 92.

[0056] The controller 10 controls the first switch circuit 30 to be turned on, and the voltage between the first end of the second resistor 91 and the second end of the third resistor 92 is the voltage across the power supply 80. Since the second resistor 91 and the third resistor 92 are connected in series, the following equation can be derived based on the equal current in the series circuit:

[0057] V1 / (R91+R92)=V3 / R92

[0058] in:

[0059] V1 is the voltage across the power supply 80;

[0060] V3 is the voltage across the third resistor 92 collected by the sampling pin ADC of the controller 10;

[0061] R91 is the resistance value of the second resistor 91;

[0062] R92 is the resistance value of the third resistor 92;

[0063] Since the resistance values ​​of the second resistor 91 and the third resistor 92 are preset values, the voltage V1 across the power source 80 can be calculated according to the above equation.

[0064] In some embodiments, as Figure 5 As shown, the voltage detection circuit 70 includes a fourth resistor 71 and a fifth resistor 72 connected in series with the fourth resistor 71, the first end of the fourth resistor 71 is electrically connected to the second end of the load 20, the second end of the fifth resistor 72 is electrically connected to the reference ground, the fourth resistor 71 and the fifth resistor 72 are connected in series and then connected in parallel with the first resistor 60, and the ADC sampling pin of the controller 10 is electrically connected between the fourth resistor 71 and the fifth resistor 72 to collect the voltage across the fifth resistor 72.

[0065] Since the fourth resistor 71 and the fifth resistor 72 are connected in series and in parallel with the first resistor 60, when the third open circuit 50 is turned on, the voltage between the first end of the fourth resistor 71 and the second end of the fifth resistor 72 is the voltage across the first resistor 60. Based on the principle that the currents in the series circuit are equal, the following equation can be derived:

[0066] V4 / (R71+R72)=V5 / R72

[0067] in:

[0068] V4 is the voltage across the first resistor 60;

[0069] V3 is the voltage across the fifth resistor 72 collected by the sampling pin ADC of the controller 10;

[0070] R71 is the resistance value of the fourth resistor 71;

[0071] R72 is the resistance value of the fifth resistor 72;

[0072] Since the resistance values ​​of the fourth resistor 71 and the fifth resistor 72 are preset values, the voltage across the first resistor 60 can be calculated according to the above equation.

[0073] Furthermore, in some embodiments, in order to improve the voltage detection accuracy across the first resistor 60, the resistance of the fourth resistor 71 is at least twice the resistance of the fifth resistor 72, so that the voltage divided by the fifth resistor 72 is smaller, and the voltage collected by the controller 10 will also be lower, thereby making the voltage collected by the controller 10 lower than its internal reference voltage.

[0074] In some embodiments, as Figure 6As shown, the second switching circuit 40 is formed by a second NMOS transistor. The gate of the second NMOS transistor serves as a second control terminal 43 and is electrically connected to the controller 10. The drain of the second NMOS transistor serves as a second input terminal 41 and is electrically connected to the second terminal of the load 20. The source of the second NMOS transistor serves as a second output terminal 42 and is electrically connected to the negative electrode of the power supply 80, or the reference ground. Furthermore, when the controller 10 inputs a high-level signal to the gate of the second NMOS transistor, the second NMOS transistor is turned on; and when the controller 10 inputs a low-level signal to the gate of the second NMOS transistor, the second NMOS transistor is turned off.

[0075] In some embodiments, as Figure 6 As shown, the third switch circuit 50 is formed by a third NMOS transistor. The gate of the third NMOS transistor serves as a third control terminal 53 and is electrically connected to the controller 10. The drain of the third NMOS transistor serves as a third input terminal 51 and is electrically connected to the second terminal of the load 20 via a first resistor 60. The source of the third NMOS transistor serves as a third output terminal 52 and is electrically connected to the negative electrode of the power supply 80, or to the reference ground. Furthermore, when the controller 10 inputs a high-level signal to the gate of the third NMOS transistor, the third NMOS transistor is turned on; and when the controller 10 inputs a low-level signal to the gate of the third NMOS transistor, the third NMOS transistor is turned off.

[0076] And, in some embodiments, please continue to see Figure 6 A sixth resistor 93 is connected between the gate and source of the second NMOS transistor 40 and the third NMOS transistor 50. Providing the sixth resistor 93 can improve the stability of the second NMOS transistor 40 and the third NMOS transistor 50. In some embodiments, the second switch circuit 40 and the third switch circuit 50 can also use PMOS transistors.

[0077] It should be noted that, in other embodiments, the above-mentioned switching circuit can also be configured as any other controllable switch, such as a relay, a transistor, an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate-turn-off thyristor (GTO) device, a silicon-controlled rectifier (SCR) device, a junction-gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, or the like.

[0078] In some embodiments, the electronic device may be Figure 7The aerosol generating device 200 shown in the figure includes a shell 210a, which is provided with an air inlet 211a for external air to enter the aerosol generating device 200a, and an air outlet 212a for the user to inhale the aerosol. A liquid storage chamber 220a is provided in the shell 210a, and the liquid storage chamber 220a is used to store liquid aerosolizable matrix material. An air guide tube 260a extends longitudinally in the liquid storage chamber 220a, and one end of the air guide tube 260a is connected to the air outlet 212a. In order to seal the liquid storage chamber 220a, a sealing member 230a is further provided in the shell 210a, and the sealing member 230a is interference fit with the inner wall of the shell 210a to seal the liquid storage chamber 220a.

[0079] The air guide tube 260a is provided with a liquid guiding element 240a and a heating element 250a combined with the liquid guiding element 240a. The heating element 250a is the load in the above-mentioned load detection circuit. The liquid guiding element 240a partially extends into the liquid storage chamber 220a. The liquid guiding element 240a is made of a hygroscopic material, such as non-woven fabric, cotton fiber, glass fiber or porous material. The heating element 250a can be combined with the liquid guiding element 240a by printing, deposition, sintering or physical assembly, or wrapped around the liquid guiding element 240a, so that the aerosolizable matrix material in the liquid storage chamber 220a can be absorbed by the liquid guiding element 240a, and the liquid guiding element 240a further transfers the aerosolizable matrix material to the heating element 250a through its internal tiny gaps or microporous structure. The heating element 250a heats the matrix material to atomize it to produce an aerosol, and releases the aerosol into the air guide tube 260a.

[0080] A vent 231a is provided on the seal 230a, and the vent 231a is connected to the air duct 260a. When the user inhales on the air outlet 212a, the external air enters the aerosol generating device 200a through the air inlet 211a, then flows into the vent 231aa through the internal air flow channel, and enters the air duct 260a through the vent 231a, and finally carries the aerosol in the air duct 260a to the vent 231a for the user to inhale.

[0081] The aerosol generating device 200a also includes a main board 290a, a battery cell 270a and an airflow sensor 280a. The main board 290a is provided with a controller of the aerosol generating device 200a. The battery cell 270a, the heating element 250a and the airflow sensor 280a are electrically connected to the controller respectively. When the user inhales at the air outlet 212a, the external air enters the aerosol generating device 200a from the air inlet 211a, and then the airflow sensor 280a senses the inhaled airflow and generates a sensing signal, which is further sent to the controller, and the controller controls the battery cell 270a to provide electrical energy to the heating element 250a.

[0082] The controller 10 of the aerosol generating device 200 controls the conduction or cutoff of the first switch circuit 30, the second switch circuit 40 and the third switch circuit 50 by outputting a PWM control signal, thereby controlling the power output to the heating element 250a, so that the power of the heating element 250a is constant each time it is operating.

[0083] Alternatively, in some embodiments, the aerosolizable substrate material may be a solid substrate such as a cigarette. The aerosolizable substrate material is preferably a tobacco-containing material that releases volatile compounds from the product when heated. Alternatively, it may be a non-tobacco material suitable for electrically heated smoking after heating. The aerosolizable substrate material may include one or more of powder, granules, shredded strips, ribbons, or flakes of one or more of herb leaves, tobacco leaves, homogenized tobacco, and expanded tobacco. Alternatively, the solid substrate may contain additional tobacco or non-tobacco volatile flavor compounds that are released when the substrate is heated.

[0084] The aerosol generating device 200 is provided with a chamber for accommodating an aerosolizable matrix material, and a heating element for heating the matrix material. The heating element heats the aerosolizable matrix material accommodated in the chamber, thereby causing at least a portion of the active material of the matrix material to volatilize due to heat to generate an aerosol. The user can inhale the aerosol by puffing on the matrix material.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Based on the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present application as described above. For the sake of simplicity, they are not provided in detail. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A load detection circuit, characterized in that: include: power supply; a first switch circuit comprising a first input terminal and a first output terminal, wherein the first input terminal is electrically connected to the positive electrode of the power supply, and the first output terminal is electrically connected to the first terminal of the load; a second switch circuit comprising a second input terminal and a second output terminal, wherein the second input terminal is electrically connected to the second terminal of the load, and the second output terminal is electrically connected to the negative electrode of the power supply; a third switch circuit, comprising a third input terminal and a third output terminal, wherein the third input terminal is electrically connected to the second terminal of the load, and the third output terminal is electrically connected to the negative electrode of the power supply; a first resistor having a first connection end and a second connection end, the first connection end being electrically connected to the second end of the load, the second connection end being electrically connected to the third input end, the first resistor being connected in series with the third switch circuit and in parallel with the second switch circuit; a voltage detection circuit, configured to detect the voltage across the first resistor; The controller is electrically connected to the first control end of the first switch circuit, the second control end of the second switch circuit, and the third control end of the third switch circuit respectively.

2. The load detection circuit according to claim 1, wherein: There are multiple loads, the negative poles of the multiple loads are arranged in parallel, and one first switch circuit is connected between any one of the loads and the positive pole of the power supply.

3. The load detection circuit according to claim 1, wherein: The first switching circuit includes at least one first NMOS transistor and at least one PMOS transistor, the gate of the first NMOS transistor being electrically connected to the controller as the first control terminal, the source of the PMOS transistor being electrically connected to the positive electrode of the power supply as the first input terminal, the drain of the PMOS transistor being electrically connected to the first terminal of the load as the first output terminal, the drain of the first NMOS transistor being electrically connected to the gate of the PMOS transistor, and the source of the first NMOS transistor being electrically connected to the reference ground.

4. The load detection circuit according to claim 1, wherein: It also includes a second resistor and a third resistor connected in series with the resistor, the first end of the second resistor is electrically connected to the first output end, the second end of the third resistor is electrically connected to the reference ground, and the ADC sampling pin of the controller is electrically connected between the second resistor and the third resistor to collect the voltage across the third resistor.

5. The load detection circuit according to claim 1, wherein: The voltage detection circuit includes a fourth resistor and a fifth resistor connected in series with the fourth resistor, the first end of the fourth resistor is electrically connected to the second end of the load, the second end of the fifth resistor is electrically connected to the reference ground, the fourth resistor and the fifth resistor are connected in series and then in parallel with the first resistor, and the ADC sampling pin of the controller is electrically connected between the fourth resistor and the fifth resistor to collect the voltage across the fifth resistor.

6. The load detection circuit according to claim 5, characterized in that: The resistance of the fourth resistor is at least twice the resistance of the fifth resistor.

7. The load detection circuit according to claim 1, wherein: The second switching circuit includes a second NMOS transistor, the gate of the second NMOS transistor is electrically connected to the controller as the second control end, the drain of the second NMOS transistor is electrically connected to the second end of the load as the second input end, and the source of the second NMOS transistor is electrically connected to the negative electrode of the power supply as the second output end.

8. The load detection circuit according to claim 1, wherein: The third switching circuit includes a third NMOS transistor, the gate of the third NMOS transistor is electrically connected to the controller as the third control terminal, the drain of the third NMOS transistor is electrically connected to the second terminal of the load through the first resistor as the third input terminal, and the source of the third NMOS transistor is electrically connected to the negative electrode of the power supply as the third output terminal.

9. The load detection circuit according to claim 7 or 8, characterized in that: A sixth resistor is connected between the gate and the source.

10. An aerosol generating device, characterized in that: include: a chamber for containing an aerosolizable matrix material; The load detection circuit according to any one of claims 1 to 9; Wherein, the load is a heating element, and the heating element is used to heat the matrix material to generate aerosol.

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