Detection method and circuit for aerosol generating device and aerosol generating device

Abstract

The invention discloses a detection method for an aerosol generating device, the aerosol generating device is provided with a containing cavity, the containing cavity is used for containing an electromagnetic induction type aerosol generating product, and the detection method is characterized in that the aerosol generating device comprises a first coil; the detection method comprises the following steps: determining a first standard detection value corresponding to the first coil when the accommodating cavity accommodates the standard aerosol generation product; when the object to be detected is placed in the accommodating cavity, determining a first current detection value corresponding to the first coil; and based on the first standard detection value and the first current detection value, determining whether the to-be-detected object is a foreign matter, so that the aerosol generating device is in a heating state or a non-heating state. The invention further discloses a circuit for the aerosol generating device and the aerosol generating device. By adopting the technical means, the starting or stopping of the heating function of the aerosol generating device can be controlled according to the foreign matter detection result, and a guarantee is provided for the reliability of the electromagnetic induction type aerosol generating device and the safety of a user.

Description

Technical Field

[0001] The present invention relates to the field of novel tobacco, and in particular to a detection method, a circuit and an aerosol generating device for an aerosol generating device. Background Art

[0002] Electromagnetic induction heat-not-burn cigarettes are a new type of tobacco product based on the principle of electromagnetic induction. Unlike traditional combustion methods, they use electromagnetic induction to precisely control temperature and evenly heat the tobacco, releasing the desired flavor and nicotine at a lower temperature. This effectively avoids the formation of harmful substances caused by high-temperature combustion, thereby reducing potential health risks to users and the pollution of the surrounding environment by secondhand smoke, making them healthier and more environmentally friendly.

[0003] However, the existing technology has a core defect that the electromagnetic properties of the metal body in the foreign object are confused with those of the standard heating component. When the user mistakenly inserts an everyday metal tool (such as tweezers, ear picks, etc.) into the heating cavity, the existing aerosol generating device (heating cigarette smoking device) may misjudge it as an adapted cigarette and start heating. If the user does not notice the abnormality and uses it directly, it will cause skin contact burns (such as ear canal burns) or ignite surrounding combustible materials (such as paper towels), causing burn accidents. At the same time, when the metal body in the foreign object invades the heating cavity of the induction coil, the heating system of the aerosol generating device is abnormally started, and then due to the incorrect energy transmission to the foreign metal body, the device causes local overheating, short circuit, component burning, and even fire risk, which seriously threatens user safety.

[0004] However, there is currently no suitable detection method that can detect foreign objects containing metal bodies, so as to achieve the upgrade of aerosol generating devices from "circuit safety" to "electromagnetic safety" and provide protection for the reliability and user safety of electromagnetic induction aerosol generating devices.

[0005] In addition to the above problems, existing aerosol generating devices also have technical problems such as the use of multiple components resulting in a non-compact and complex structure. Summary of the Invention

[0006] In a first aspect, the present application provides a detection method for an aerosol-generating device, wherein the aerosol-generating device is provided with a receiving chamber for receiving an electromagnetic induction aerosol-generating article, and the aerosol-generating device includes a first coil. The detection method includes:

[0007] determining a first standard detection value corresponding to the first coil when the accommodating chamber is in an empty state or when the accommodating chamber contains a standard aerosol-generating article;

[0008] When the object to be tested is placed in the receiving cavity, determining a first current detection value corresponding to the first coil;

[0009] Based on the first standard detection value and the first current detection value, it is determined whether the object to be detected is a foreign object, so that the aerosol generating device is in a heating state or a non-heating state.

[0010] According to the detection method for an aerosol generating device provided in the present application, it is possible to determine whether the object to be detected is a foreign object based on the first standard detection value and the first current detection value, so as to place the aerosol generating device in a heating state or a non-heating state. That is, the heating function of the aerosol generating device can be turned on or off by controlling the foreign object detection result, thereby preventing the heating system of the aerosol generating device from abnormally starting due to the insertion of a foreign object containing a metal body during abnormal use of the aerosol generating device. This further avoids the risk of local overheating, short circuiting, or component burning of the device due to incorrect energy transmission to the foreign metal body, thereby achieving an upgrade of the aerosol generating device from "circuit safety" to "electromagnetic safety", and providing guarantees for the reliability and user safety of electromagnetic induction aerosol generating devices.

[0011] In some embodiments, the aerosol generating device further comprises a second coil, the first coil and the second coil are arranged along the length direction of the accommodating cavity, and the second coil can be connected to the heating circuit and the detection circuit respectively. When the aerosol generating device is in a non-heating state, the first coil and the second coil are respectively connected to the detection circuit, and the detection method comprises:

[0012] respectively determining a first standard detection value corresponding to the first coil and a second standard detection value corresponding to the second coil when the containing chamber is in an empty state or when the containing chamber contains a standard aerosol generating article;

[0013] When the object to be tested is placed in the receiving cavity, a first current detection value corresponding to the first coil and a second current detection value corresponding to the second coil are respectively determined;

[0014] Based on the first standard detection value, the second standard detection value, the first current detection value, and the second current detection value, it is determined whether the object to be detected is a foreign object, so that the aerosol generating device is in a heating state or a non-heating state.

[0015] In some embodiments, the step of determining whether the object to be detected is a foreign object based on the first standard detection value, the second standard detection value, the first current detection value, and the second current detection value, so as to place the aerosol generating device in a heating state or a non-heating state, includes:

[0016] determining whether a first detection difference value between a first current detection value and a first standard detection value falls within a first detection range;

[0017] If it is determined that the first detection difference value does not fall within the first detection range, determining that the object to be detected is a foreign object, so that the aerosol generating device is in a non-heating state;

[0018] When it is determined that the first detection difference value falls within the first detection range, it is determined whether the second detection difference value between the second current detection value and the second standard detection value falls within the second detection range to determine whether the object to be detected is a foreign object, so that the aerosol generating device is in a heating state or a non-heating state.

[0019] In some embodiments, the step of determining whether a second detection difference between a second current detection value and a second standard detection value falls within a second detection range to determine whether the object to be detected is a foreign object and placing the aerosol generating device in a heating state or a non-heating state includes:

[0020] If it is determined that the second detection difference value does not fall within the second detection range, determining that the object to be detected is a foreign object, so that the aerosol generating device is in a non-heating state;

[0021] When it is determined that the second detection difference value falls within the second detection range, determining that the object to be tested is a standard aerosol-generating article, so that the aerosol-generating device is in a heating state; or

[0022] When it is determined that the second detection difference value falls within the second detection range, determine whether the second detection difference value falls within the third detection range; when it is determined that the second detection difference value does not fall within the third detection range but falls within the second detection range, the user determines whether the object to be tested is a foreign object, so that the aerosol generating device is in a heating state or a non-heating state; when it is determined that the second detection difference value falls within the third detection range, determine that the object to be tested is a standard aerosol generating product, so that the aerosol generating device is in a heating state; the second detection range covers the third detection range.

[0023] In some embodiments, the first detection difference value is the difference between the first current detection value and the first standard detection value, and the second detection difference value is the difference between the second current detection value and the second standard detection value; and / or,

[0024] The detection value includes the resonant frequency, the first detection range is greater than or equal to 0 and less than 150kHz; and / or, the second detection range is greater than or equal to 0 and less than 300kHz; and / or, the third detection range is greater than or equal to 0 and less than 150kHz; or,

[0025] The detection value includes a voltage value, the first detection range is greater than 0 or equal to and less than 0.5V; and / or, the second detection range is greater than 0 or equal to and less than 1V; and / or, the third detection range is greater than 0 or equal to and less than 0.5V.

[0026] In some embodiments, the first detection difference value is the change rate between the first current detection value and the first standard detection value, and the second detection difference value is the change rate between the second current detection value and the second standard detection value; and / or,

[0027] The detection value includes the resonant frequency, the first detection range is greater than 0 or equal to and less than 5%; and / or, the second detection range is greater than 0 or equal to and less than 10%; and / or, the third detection range is greater than or equal to 0 and less than 5%; or,

[0028] The detection value includes a voltage value, the first detection range is greater than 0 or equal to and less than 17%; and / or, the second detection range is greater than 0 or equal to and less than 33%; and / or, the third detection range is greater than or equal to 0 and less than 17%.

[0029] In a second aspect, the present application further provides a circuit that can be used in an aerosol-generating device. The aerosol-generating device is provided with a receiving chamber for receiving an electromagnetic induction aerosol-generating product. The aerosol-generating device includes a first coil, and the circuit includes:

[0030] Detection circuit, including:

[0031] a first resonant amplifying circuit, configured to determine the electromagnetic signal of the first coil, the first resonant amplifying circuit comprising a first inductor, a first resistor, and a first capacitor, wherein the first inductor and the first resistor are derived from the connected first coil;

[0032] A signal conditioning module, configured to condition the electromagnetic signal from the first resonant amplifying circuit into a weak electric signal;

[0033] The processor is used to process the weak current signal from the signal conditioning module to determine a first detection value, and the first detection value is used to determine whether the object to be tested placed in the receiving chamber is a foreign object, so as to put the aerosol generating device into a heating state or a non-heating state.

[0034] In some embodiments, the circuit includes: a first switch and a heating circuit, the aerosol generating device further includes a second coil, one end of the first switch is connected to the second coil, and the other end of the first switch is connected to the detection circuit or the heating circuit.

[0035] In some embodiments, the detection circuit includes a second resonant amplification circuit, and the other end of the first switch is connected to the second resonant amplification circuit, which is used to determine the electromagnetic signal of the second coil, and the second resonant amplification circuit includes a second inductor, a second resistor and a second capacitor, wherein the second inductor and the second resistor come from the connected second coil; the signal conditioning module is used to condition the electromagnetic signals from the first resonant amplification circuit and the second resonant amplification circuit into weak current signals; the processor is used to process the weak current signal from the signal conditioning module to determine a second detection value, and the second detection value is used to determine whether the object to be tested placed in the accommodating cavity is a foreign object, so that the aerosol generating device is in a heating state or a non-heating state; and / or, the processor is able to execute a detection method as any one of the first aspects.

[0036] In a third aspect, the present application further provides an aerosol generating device, comprising:

[0037] A receiving chamber for receiving an electromagnetic induction aerosol generating product;

[0038] First coil;

[0039] PCB board, the PCB board is provided with a circuit, the circuit including a detection circuit, including:

[0040] a first resonant amplifying circuit, configured to determine the electromagnetic signal of the first coil, the first resonant amplifying circuit comprising a first inductor, a first resistor, and a first capacitor, wherein the first inductor and the first resistor are derived from the connected first coil;

[0041] A signal conditioning module, configured to condition the electromagnetic signal from the first resonant amplifying circuit into a weak electric signal;

[0042] The processor is used to process the weak current signal from the signal conditioning module to determine a first detection value, and the first detection value is used to determine whether the object to be tested placed in the receiving chamber is a foreign object, so as to put the aerosol generating device into a heating state or a non-heating state.

[0043] In some embodiments, the aerosol generating device includes a second coil; the circuit includes a first switch and a heating circuit, one end of the first switch is connected to the second coil, and the other end of the first switch is connected to the detection circuit or the heating circuit.

[0044] In some embodiments, the aerosol-generating device satisfies at least one or more of the following conditions:

[0045] The first switch comprises a single-pole double-throw switch or a transistor;

[0046] The first coil includes a plurality of coils, and along the length direction of the accommodating cavity, one or more coils of the plurality of coils are arranged above the second coil, and one or more coils of the plurality of coils are arranged below the second coil;

[0047] The first resonant amplifying circuit includes a plurality of first coils, each of which is connected to each first resonant amplifying circuit;

[0048] The first coil includes two coils, a first upper coil and a first lower coil, wherein the first upper coil is arranged above the second coil, and the first lower coil is arranged below the second coil;

[0049] The first coil and / or the second coil include a planar coil and / or a solenoid coil;

[0050] The PCB board includes a flexible PCB board and a non-flexible PCB board, the flexible PCB board is printed with a first coil and a second coil, and the non-flexible PCB board is provided with a signal conditioning module and a processor;

[0051] The processor is capable of executing any detection method according to the first aspect.

[0052] In a fourth aspect, the present application further provides an aerosol generating device, comprising: a receiving chamber for receiving an aerosol generating article;

[0053] Second coil;

[0054] A PCB board is provided with a circuit, the circuit including a detection circuit, a heating circuit, and a first switch, one end of the first switch is connected to the second coil, and the other end of the first switch is connected to the detection circuit or the heating circuit; the detection circuit includes:

[0055] a second resonant amplifying circuit, configured to determine the electromagnetic signal of the second coil, the second resonant amplifying circuit comprising a second inductor, a second resistor, and a second capacitor, wherein the second inductor and the second resistor are derived from the connected second coil;

[0056] a signal conditioning module, configured to condition the electromagnetic signal from the second resonant amplifying circuit into a weak electric signal;

[0057] The processor is used to process the weak electric signal from the signal conditioning module to determine a second detection value, and the second detection value is used to determine whether the object to be tested placed in the accommodating cavity is a foreign object, so as to put the aerosol generating device into a heating state or a non-heating state.

[0058] According to an aerosol generating device provided by the present application, it is possible to determine whether the object to be tested is a foreign object based on a second detection value, so that the aerosol generating device is in a heating state or a non-heating state, thereby avoiding the abnormal startup of the heating system of the aerosol generating device due to the insertion of a foreign object containing a metal body when the aerosol generating device is not used normally, thereby avoiding the risk of local overheating, short circuit, or component burning of the device due to incorrect energy transmission to the foreign metal body, realizing the dimensional upgrade of the aerosol generating device from "circuit safety" to "electromagnetic safety", providing protection for the reliability and user safety of the electromagnetic induction aerosol generating device, and at the same time, through the first switch, the second coil detection and heating functions can be reused to ensure the compact and simplified structure of the smoking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 The process of the detection method for an aerosol generating device according to some embodiments of the present application is shown Figure 1 ;

[0060] Figure 2 The process of the detection method for an aerosol generating device according to some embodiments of the present application is shown Figure 2 ;

[0061] Figure 3 The process of the detection method for an aerosol generating device according to some embodiments of the present application is shown Figure 3 ;

[0062] Figure 4 The process of the detection method for an aerosol generating device according to some embodiments of the present application is shown Figure 4 ;

[0063] Figure 5 The process of the detection method for an aerosol generating device according to some embodiments of the present application is shown Figure 5 ;

[0064] Figure 6 Schematic diagram showing a circuit for an aerosol generating device according to some embodiments of the present application Figure 1 ;

[0065] Figure 7 A block diagram showing a detection circuit according to some embodiments of the present application Figure 1 ;

[0066] Figure 8 A block diagram showing a detection circuit according to some embodiments of the present application Figure 2 ;

[0067] Figure 9 A first series resonant amplifier circuit diagram according to some embodiments of the present application is shown;

[0068] Figure 10 A first parallel resonant amplifier circuit diagram provided according to some embodiments of the present application is shown;

[0069] Figure 11 Schematic diagram showing the receiving cavity provided in some embodiments of the present application in a hollow state Figure 1 ;

[0070] Figure 12 Schematic diagram showing the receiving cavity provided in some embodiments of the present application in a hollow state Figure 2 ;

[0071] Figure 13 Schematic diagram showing the receiving cavity provided in some embodiments of the present application in a hollow state Figure 3 ;

[0072] Figure 14 A schematic diagram showing an aerosol-generating article for an aerosol-generating device according to some embodiments of the present application is shown;

[0073] Figure 15 Schematic diagram showing the receiving cavity provided in some embodiments of the present application in a hollow state Figure 4 ;

[0074] Figure 16 Schematic diagram showing the container housing the object to be tested according to some embodiments of the present application Figure 1 ;

[0075] Figure 17 Schematic diagram showing the container housing the object to be tested according to some embodiments of the present application Figure 2 ;

[0076] Figure 18 The mutual inductance coupling model between the detection coil and the heating component provided in some embodiments of the present application is shown;

[0077] Figure 19a Shown is a planar spiral detection coil provided according to some embodiments of the present application;

[0078] Figure 19b Showing a planar rectangular detection coil provided according to some embodiments of the present application;

[0079] Figure 19c A cylindrical solenoid type detection coil according to some embodiments of the present application is shown;

[0080] Figure 19d A short dipole pair spiral detection coil according to some embodiments of the present application is shown;

[0081] Figure 20 A schematic diagram illustrating the first determination of a standard detection value according to some embodiments of the present application;

[0082] Figure 21 A schematic diagram illustrating a calibration triggered by a standard detection value provided in some embodiments of the present application is shown;

[0083] Figure 22 The process of the detection method for an aerosol generating device according to some embodiments of the present application is shown Figure 6 . DETAILED DESCRIPTION

[0084] The following is an explanation of the embodiments of the present invention by specific specific examples. 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 embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0085] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0086] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0087] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0088] First, reference Figure 1 , the present application provides a detection method for an aerosol generating device. Figures 11-17 The aerosol generating device is provided with a receiving chamber 1 for receiving an aerosol generating product. Preferably, the aerosol generating product is an electromagnetic induction aerosol generating product. The aerosol generating device includes a first coil 2. The detection method includes the following steps:

[0089] Step S10', determining a first standard detection value corresponding to the first coil 2 when the accommodating chamber 1 is in an empty state or when the accommodating chamber 1 accommodates a standard aerosol generating article;

[0090] Step S20', when the object to be tested is placed in the accommodating cavity 1, determining a first current detection value corresponding to the first coil 2;

[0091] Step S30 ′: determining whether the object to be detected is a foreign object based on the first standard detection value and the first current detection value, so as to place the aerosol generating device in a heating state or a non-heating state.

[0092] It should be noted that "standard aerosol-generating products" can be understood as one or more aerosol-generating products used in conjunction with the aerosol-generating device. "Foreign objects" can be understood as non-standard aerosol-generating products. In other words, other items besides standard aerosol-generating products, such as non-aerosol-generating products made of metal (such as ear picks, paper clips, or tweezers), or one or more aerosol-generating products not used in conjunction with the aerosol-generating device.

[0093] According to the detection method for an aerosol generating device provided in the present application, it is possible to determine whether the object to be detected is a foreign object based on the first standard detection value and the first current detection value, so as to place the aerosol generating device in a heating state or a non-heating state. That is, the heating function of the aerosol generating device can be turned on or off by controlling the foreign object detection result, thereby preventing the heating system of the aerosol generating device from abnormally starting due to the insertion of a foreign object containing a metal body during abnormal use of the aerosol generating device. This further avoids the risk of local overheating, short circuiting, or component burning of the device due to incorrect energy transmission to the foreign metal body, thereby achieving an upgrade of the aerosol generating device from "circuit safety" to "electromagnetic safety", and providing guarantees for the reliability and user safety of electromagnetic induction aerosol generating devices.

[0094] In some embodiments, reference Figure 6 Combined with Figures 11-16 The aerosol generating device includes a second coil 3, which can be connected to a heating circuit and a detection circuit respectively. The first coil 2 and the second coil 3 are arranged along the length direction of the accommodating cavity (for example, the first coil 2 and the second coil 3 partially overlap or do not overlap in the length direction). When the aerosol generating device is in a non-heating state, the first coil 2 and the second coil 3 are connected to the detection circuit respectively. Figure 2 , detection methods include:

[0095] Step S10, respectively determining a first standard detection value corresponding to the first coil 2 and a second standard detection value corresponding to the second coil 3 when the accommodating chamber 1 is in an empty state or when the accommodating chamber 1 accommodates a standard aerosol generating article;

[0096] Step S20, when the object to be tested is placed in the accommodating cavity 1, determining a first current detection value corresponding to the first coil 2 and a second current detection value corresponding to the second coil 3 respectively;

[0097] Step S30 , determining whether the object to be detected is a foreign object based on the first standard detection value, the second standard detection value, the first current detection value, and the second current detection value, so as to place the aerosol generating device in a heating state or a non-heating state.

[0098] Since the first coil 2 and the second coil 3 can both be connected to the detection circuit, and the first coil 2 and the second coil 3 are arranged along the length direction of the accommodation cavity (such as Figure 11 The Z direction as shown in the figure increases the range of foreign body detection, thereby improving the accuracy of foreign body detection.

[0099] In some embodiments, reference Figure 3 Step S30, based on the first standard detection value, the second standard detection value, the first current detection value, and the second current detection value, determines whether the object to be detected is a foreign object, so as to place the aerosol generating device in a heating state or a non-heating state, comprising the following steps:

[0100] Step S31, determining whether a first detection difference value between a first current detection value and a first standard detection value falls within a first detection range;

[0101] Step S32, when it is determined that the first detection difference value does not fall within the first detection range, determining that the object to be detected is a foreign object, so that the aerosol generating device is in a non-heating state;

[0102] Step S33, when it is determined that the first detection difference value falls within the first detection range, determines whether the second detection difference value between the second current detection value and the second standard detection value falls within the second detection range to determine whether the object to be detected is a foreign object, so that the aerosol generating device is in a heating state or a non-heating state.

[0103] According to the above detection method, when the first detection difference value does not fall within the first detection range, the object to be detected is directly determined to be a foreign body, and the judgment is no longer based on the second detection difference value; when the first detection difference value falls within the first detection range, the judgment is further based on the second detection difference value, thereby improving the detection efficiency while ensuring the accuracy of foreign body detection.

[0104] In some embodiments, reference Figure 4 Step S33, determining whether a second detection difference between the second current detection value and the second standard detection value falls within a second detection range to determine whether the object to be detected is a foreign object, so as to place the aerosol generating device in a heating state or a non-heating state, comprises the following steps:

[0105] Step S331: if it is determined that the second detection difference value does not fall within the second detection range, determining that the object to be detected is a foreign object, so that the aerosol generating device is in a non-heating state; and / or,

[0106] Step S332 : When it is determined that the second detection difference value falls within the second detection range, the object to be tested is determined to be a standard aerosol product, so that the aerosol device is in a heating state.

[0107] In another embodiment, reference Figure 5 Step S33, determining whether a second detection difference between the second current detection value and the second standard detection value falls within a second detection range to determine whether the object to be detected is a foreign object, so as to place the aerosol generating device in a heating state or a non-heating state, comprises the following steps:

[0108] Step S331′: if it is determined that the second detection difference value does not fall within the second detection range, determining that the object to be detected is a foreign object, so that the aerosol generating device is in a non-heating state; and / or,

[0109] Step S332′: if it is determined that the second detection difference value falls within the second detection range, determine whether the second detection difference value falls within the third detection range, wherein the second detection range covers the third detection range;

[0110] In step S333', when it is determined that the second detection difference value does not fall within the third detection range but falls within the second detection range, the user determines whether the object to be detected is a foreign object, thereby placing the aerosol generating device in a heating state or a non-heating state; it should be noted that the user can determine whether the object to be detected is a foreign object through the operation interface on the aerosol generating device; and / or,

[0111] In step S334', when it is determined that the second detection difference value falls within the third detection range, the object to be tested is determined to be a standard aerosol generating article, so that the aerosol generating device is in a heating state.

[0112] In other words, when making a determination based on the second detection difference value, in some embodiments, only the second detection difference value may be compared with the second detection range. (a) If the second detection difference value is determined to be outside the second detection range, the object to be detected is determined to be a foreign object; (b) If the second detection difference value is determined to be within the second detection range, the object to be detected is determined to be a standard aerosol-generating article. In other embodiments, the second detection difference value may be compared with both the second detection range and the third detection range. (a) If the second detection difference value is outside the second detection range, the object to be detected is determined to be a foreign object; (b) If the second detection difference value is outside the third detection range but is within the second detection range, the user determines whether the object to be detected is a foreign object; (c) If the second detection difference value is within the third detection range, the object to be detected is determined to be a standard aerosol-generating article. It should be noted that the "second detection range" in some embodiments may be the same as or different from that in other embodiments.

[0113] In some embodiments, the first detection difference value is the difference between the first current detection value and the first standard detection value, and the second detection difference value is the difference between the second current detection value and the second standard detection value. In other embodiments, the first detection difference value is the rate of change between the first current detection value and the first standard detection value, and the second detection difference value is the rate of change between the second current detection value and the second standard detection value.

[0114] In some embodiments, the detected value includes a resonant frequency. For example, the resonant frequency can be determined based on a resonant amplifier circuit. When the circuit impedance reaches an extreme value at resonance, and the voltage reaches an extreme value under a constant current, the resonant frequency can be determined by sweeping the frequency and measuring the resonant amplifier voltage. Alternatively, the AC voltage and current waveforms can be directly measured. When the voltage and current reach the same phase, the circuit resonates. Signal processing and calculation are performed through a phase-locked loop to obtain the corresponding frequency, which is the resonant frequency.

[0115] In other embodiments, the detection value includes a voltage value. For example, the voltage value can be determined based on a resonant amplifier circuit. The resonant amplifier circuit will be described in detail below.

[0116] In the case where the first detection difference value is the difference between the first current detection value and the first standard detection value, and the second detection difference value is the difference between the second current detection value and the second standard detection value, in some embodiments, the detection value includes a resonant frequency, and exemplarily, the absolute value of the first detection range is greater than or equal to 0 and less than 150kHz; and / or, the absolute value of the second detection range is greater than or equal to 0 and less than 300kHz; and / or, the absolute value of the third detection range is greater than or equal to 0 and less than 150kHz. In other embodiments, the detection value includes a voltage value, and exemplarily, the absolute value of the first detection range is greater than or equal to 0 and less than 0.5V; and / or, the absolute value of the second detection range is greater than or equal to 0 and less than 1V; and / or, the absolute value of the third detection range is greater than or equal to 0 and less than 0.5V.

[0117] In the case where the first detection difference value is the rate of change between the first current detection value and the first standard detection value, and the second detection difference value is the rate of change between the second current detection value and the second standard detection value, in some embodiments, the detection value includes a resonant frequency, and exemplarily, the absolute value of the first detection range is greater than or equal to 0 and less than 5%; and / or, the absolute value of the second detection range is greater than or equal to 0 and less than 10%. In other embodiments, the detection value includes a voltage value, and exemplarily, the absolute value of the first detection range is greater than or equal to 0 and less than 17%; and / or, the absolute value of the second detection range is greater than or equal to 0 and less than 33%; and / or, the absolute value of the third detection range is greater than or equal to 0 and less than 17%.

[0118] Second, reference Figure 6 and Figure 7 The present application also provides a circuit for an aerosol generating device, including: a detection circuit, which includes: a first resonant amplification circuit 10, a signal conditioning module 20 and a processor 30.

[0119] The first resonant amplifier circuit 10 is used to determine the electromagnetic signal of the first coil 2. The first resonant amplifier circuit 10 includes a first inductor, a first resistor, and a first capacitor. The first inductor and the first resistor come from the connected first coil 2. In other words, the first coil 2 can be equivalent to the first inductor L after being connected. D and the first resistor R D and form a resonant circuit with the first capacitor C. Exemplarily, the electromagnetic signal can be a voltage signal, the first coil 2 can be connected to the circuit through the wiring ports at both ends of it, and the voltage at both ends of the first coil 2 can be obtained through the voltage sampling circuit to obtain a voltage amplification signal for subsequent signal conditioning module processing; or, the electromagnetic signal can be a resonant frequency signal, based on the resonant amplification circuit, determine the frequency corresponding to the extreme value of the voltage amplification signal, that is, the resonant frequency, for subsequent signal conditioning module processing. The electromagnetic signal may include the first standard detection signal corresponding to the first standard detection value and the first current detection signal corresponding to the first current detection value in the above-mentioned first aspect method. The amplifier circuit based on the resonant topology can amplify the smaller voltage signal of the first coil 2, thereby improving the accuracy of the detection result.

[0120] The signal conditioning module 20 is used to condition the electromagnetic signal from the first resonant amplification circuit 10 into a weak electrical signal. This weak electrical signal can be amplified, filtered, and shaped more accurately, thereby improving the sensitivity of the entire system. Furthermore, the weak electrical signal is less sensitive to external interference (such as electromagnetic interference), so it is less susceptible to interference during transmission, helping to maintain signal integrity. For example, the signal conditioning module 20 may include a rectifier circuit and / or a filter circuit.

[0121] The processor 30 is configured to process the weak electrical signal from the signal conditioning module 20 to determine a first detection value (which may include a first standard detection value and a first current detection value). The first detection value is used to determine whether the object to be detected placed in the receiving chamber is a foreign object, thereby placing the aerosol-generating device in the heating state or the non-heating state. For example, the processor 30 may execute the method of any embodiment of the first aspect based on the weak electrical signal, which will not be further described herein.

[0122] According to the present application, a circuit for an aerosol generating device is provided, which can control the turning on or off of the heating function of the aerosol generating device (i.e., in a heating state or a non-heating state) through the foreign object detection result, thereby avoiding the risk of abnormal startup of the heating system of the aerosol generating device due to the insertion of foreign objects containing metal bodies in abnormal use of the aerosol generating device, causing local overheating, short circuit, or component burning of the device, thereby realizing the upgrade of the aerosol generating device from the dimension of "circuit safety" to "electromagnetic safety", and providing protection for the reliability and user safety of electromagnetic induction aerosol generating devices.

[0123] In some embodiments, the processor 30 may be a microcontroller. Specifically, the processor 30 may be an STM32F030C8T6 microcontroller. This is an ARM Cortex-M0 core-based microcontroller produced by STMicroelectronics and has the advantages of high cost performance, low power consumption, and a rich set of peripherals.

[0124] In some embodiments, continue to refer to Figure 6 , the circuit for the aerosol generating device also includes: a first switch K1 and a heating circuit. The aerosol generating device also includes a second coil 3, one end of the first switch K1 is connected to the second coil 3, and the other end of the first switch K1 is connected to the detection circuit or the heating circuit. Exemplarily, the first switch K1 includes a single-pole double-throw switch, and the second coil 3 is switched between the "detection coil" and the "heating coil" through the single-pole double-throw switch. The single-pole double-throw switch can be a single-pole double-throw switch of model ADG824 from Analog Devices. In some other embodiments, the first switch K1 includes a transistor, which can be a power transistor or a combination thereof. In other words, when the aerosol generating device is in a non-heating state, the second coil 3 is connected to the detection circuit through the first switch K1, and at this time the second coil 3 acts as a detection coil; when it is determined that the object to be detected is not a foreign object, the first switch K1 is controlled to switch to the heating circuit, and the second coil 3 is connected to the heating circuit to enable the heating component (such as Figure 14 (as shown), heating occurs, placing the aerosol generating device in a heating state. At this point, the second coil 3 functions as a heating coil. After heating is complete, the aerosol generating device enters a non-heating state, and the first switch K1 is controlled to switch back to the detection circuit, reconnecting the second coil 3 to the detection circuit. The first switch K1 allows the second coil 3 to reuse both its detection and heating functions, improving foreign object detection accuracy while maintaining a compact design.

[0125] In some embodiments, reference Figure 8, the detection circuit also includes a second resonant amplifying circuit 40. The other end of the first switch K1 is connected to the second resonant amplifying circuit 40, and is used to determine the electromagnetic signal of the second coil 3. Exemplarily, the electromagnetic signal may include a voltage signal or a resonant frequency signal, and the electromagnetic signal may include the second standard detection signal corresponding to the second standard detection value and the second current detection signal corresponding to the second current detection value in the above-mentioned first aspect method. The second resonant amplifying circuit includes a second inductor, a second resistor and a second capacitor, wherein the second inductor and the second resistor come from the connected second coil 3. The signal conditioning module 20 is used to condition the electromagnetic signal from the second resonant amplifying circuit 40 into a weak current signal for processing by the processor 30. The processor 30 is used to process the weak current signal from the signal conditioning module 20 to determine the second detection value (which may include the second standard detection value and the second current detection value), and the second detection value is used to determine whether the object to be tested placed in the accommodating cavity is a foreign body, so that the aerosol generating device is in a heating state or a non-heating state.

[0126] In some embodiments, reference Figure 9 The first resonant amplifier circuit includes a first series resonant amplifier circuit, and the first series resonant amplifier circuit includes an AC voltage U AC , the first inductor L D , the first resistor R D , a first capacitor C, a fourth resistor R1 and an amplifier element A. One end of the fourth resistor R1 is connected to the AC voltage U AC The other end of the fourth resistor R1 is connected to the inverting input terminal of the amplifier element A and one end of the first coil 2. The other end of the first coil 2 is connected to the output terminal of the amplifier element A via the first capacitor C. The non-inverting input terminal of the amplifier element A is grounded. For example, the amplifier element A can be an amplifier (e.g., an operational amplifier).

[0127] In some embodiments, reference Figure 10 The first resonant amplifier circuit includes a first parallel resonant amplifier circuit, and the first parallel resonant amplifier circuit includes an AC voltage U AC , the first inductor L D , the first resistor R D , first capacitor C, fourth resistor R1, amplifier element A and feedback resistor R f Among them, the first coil 2, the first capacitor C and the feedback resistor R f In parallel with each other, one end of the fourth resistor R1 is connected to the AC voltage U AC The other end of the fourth resistor R1 is connected to the inverting input end of the amplifier element A and the feedback resistor R fThe first coil 2 is connected to one end of the first capacitor C, and the other end of the first coil 2 is connected to the output end of the amplifier element A. The non-inverting input end of the amplifier element A is grounded. For example, the amplifier element A can be an amplifier (such as an operational amplifier). By setting the feedback resistor R f , part of the amplifier's output signal is fed back to the amplifier's inverting input terminal to establish a negative feedback loop inside the amplifier, thereby stabilizing the amplifier's gain, preventing the amplifier from operating in a saturated or nonlinear region, and improving the circuit's operating stability.

[0128] In some embodiments, reference Figure 9 and Figure 10 The first resonant amplifier circuit also includes a diode D e , the third resistor R e and the third capacitor C e Among them, the diode D e The positive electrode of the diode D is connected to the output terminal of the amplifier element A. e The negative electrode and the third resistor R e One end of the third capacitor C e One end of the third resistor R e and the third capacitor C e In parallel, the third resistor R e The other end of the third capacitor C e The other end of the diode D e It has a unidirectional conduction function, which can prevent the signal from being transmitted in reverse and avoid interference with the amplifier and subsequent circuits. e and the third capacitor C e It can ensure that the amplifier can operate normally and stably. The detection value can be the first inductance L D and the first resistor R D The AC voltage detection value (e.g., amplitude) at both ends of the series branch (i.e., the equivalent circuit portion after the first coil 2 is connected); it can also be the third resistor R e and the third capacitor C e The DC voltage detection value at both ends of the parallel branch is proportional to the above-mentioned AC voltage detection value.

[0129] The specific structure of the second resonant amplifier circuit 40 can refer to the above description of the first resonant amplifier circuit 10, which will not be repeated here. It should be noted that the first resonant amplifier circuit 10 and the second resonant amplifier circuit 40 can be respectively set to the AC voltage U AC (signal source), can also share the same AC voltage U AC (Signal source).

[0130] The above two resonant amplifier circuits (such as Figure 9The first series resonant amplifier circuit shown and Figure 10 Both the first parallel resonant amplifier circuit shown in the figure can determine whether the object under test is a foreign object by the difference in the voltage amplification signal or the resonant frequency signal. The difference is that when the circuit is adjusted to the resonant operating condition, the total impedance of the series resonant amplifier circuit reaches its minimum value at the resonant frequency, so the current through the circuit reaches its maximum value during resonance; the total impedance of the parallel resonant amplifier circuit reaches its maximum value at the resonant frequency, so the current through the circuit reaches its minimum value during resonance.

[0131] For the series resonant amplifier circuit, its sensitivity to impedance changes is high, which can effectively reflect the small impedance differences of the object to be tested, and is therefore more suitable for precision detection of objects to be tested with higher performance requirements. If higher detection accuracy is required (such as the judgment of small differences), it is preferred to use a series resonant amplifier circuit. For the parallel resonant amplifier circuit, its response to signal amplitude is more stable and its anti-interference performance is stronger, which is suitable for batch detection and complex detection environments. If the detection environment is more complex (such as a large interference signal), it is preferred to use a parallel resonant amplifier circuit.

[0132] It should be noted that although the present application only shows embodiments of a series resonant amplifier circuit and a parallel resonant amplifier circuit, those skilled in the art will appreciate that the present application may also be implemented using other composite resonant circuits.

[0133] In some embodiments, the AC voltage U AC Provided by an AC voltage source chip. Specifically, the AC voltage source chip can be a chip model AD9851BRSZRL. This is a direct digital synthesizer (DDS) chip produced by Analog Devices, Inc. (ADI). It is powerful and highly integrated, capable of generating high-precision sinusoidal signals, and can output 3MHz-10MHz sinusoidal waves with a step accuracy of 1kHz.

[0134] Thirdly, reference Figure 11 The present application also provides an aerosol generating device (not shown in the figure), comprising: a receiving chamber 1 for receiving an electromagnetic induction aerosol generating product, wherein a heating component (such as Figure 14 as shown); a first coil 2 and a second coil 3, the second coil 3 being capable of being connected to a heating circuit to heat the heating component; a PCB board (not shown in the figure), the PCB board being provided with a circuit for an aerosol generating device in any embodiment of the second aspect.

[0135] It should be noted that a "heating element" can be understood as a component that rapidly heats the tobacco substrate or other aerosolizable material through eddy currents. Preferably, at least a portion of the heating element can be placed in the aerosol-generating article. Aerosol-generating articles can be smoking products in the form of cigarettes, including but not limited to tobacco flakes, tobacco granules, shredded tobacco, reconstituted tobacco, and other tobacco products that can be heated by an aerosol-generating device to generate an aerosol for inhalation by the user. Furthermore, the "heating element" is preferably a portion of the aerosol-generating article, that is, the aerosol-generating article includes the "heating element."

[0136] Furthermore, the second coil 3 can be connected to the heating circuit and the detection circuit respectively, and the first coil 2 and the second coil 3 are connected along the length direction of the accommodating cavity (such as Figure 11 In other words, the two may not overlap or partially overlap in the length direction. This arrangement can expand the detection range while ensuring the compactness of the device structure.

[0137] In some embodiments, the first coil 2 includes a plurality of coils arranged along the length direction of the accommodating cavity 1 (eg Figure 11 In the Z direction shown in FIG. 1 , several coils among the plurality of coils are arranged above the second coil, and several other coils among the plurality of coils are arranged below the second coil 3. The first resonant amplifying circuit 10 includes a plurality of first coils 2, each of which is connected to each first resonant amplifying circuit.

[0138] In some embodiments, the first coil 2 and / or the second coil 3 include a planar coil and / or a solenoid coil. In other words, the first coil 2 and the second coil 3 can be both planar coils (e.g. Figure 12 As shown) or the same solenoid type coil (such as Figure 11 Alternatively, the first coil 2 and the second coil 3 are of different types, such as Figure 13 As shown, the first coil 2 can be a planar coil and the second coil 3 can be a solenoid coil; or Figure 15 As shown, in the case where the first coil 2 includes multiple coils, the first coil can include a planar coil and a solenoid coil. It should be noted that the number of the first coil 2 can be one or more, along the length direction of the accommodating cavity (such as Figure 11 The first coil 2 and the second coil 3 may be arranged in a continuous manner, at intervals, or partially overlapped with each other, which is not specifically limited here.

[0139] In some embodiments, reference Figure 17 The number of the first coil 2 is one, which can be arranged above the second coil 3, that is, along the length direction (such as Figure 11The first coil 2 is positioned in the direction of the second coil 3, close to the opening of the receiving chamber for inserting the aerosol-generating article. When the length of the object 4 is larger than that of the receiving chamber 1, detection of such an object 4 (e.g., metal tweezers or a metal ear pick) can be achieved using only the first coil 2 positioned at the top.

[0140] For example, after the aerosol generating device is powered on (e.g., turned on), the AC voltage source chip (e.g., AD9851 chip) sweeps the frequency of the first coil. For example, the sweep frequency is 3 to 10 MHz, with a step of 10 kHz. The voltage signal corresponding to each frequency point is recorded, and the frequency corresponding to the minimum voltage signal is used as the first background detection value f bg-top When metal tweezers enter the accommodating cavity 1, the first coil 2 at the top is affected by the metal, and its equivalent inductance changes, so the resonant frequency shifts. At this time, the current first current detection value f of the first coil 2 is determined by the detection circuit. exam-top Based on the first current detection value f exam-top and the first background detection value f bg-top The difference value, for example, the difference Δf = f exam-top -f bg-top Whether the absolute value of falls within the absolute value of the first detection range [0, 150) kHz, it is determined whether the object to be tested 4 is a foreign object, so that the aerosol generating device is in a non-heating state, avoiding the insertion of foreign objects, which triggers abnormal heating of the aerosol generating device, causing unnecessary damage to the device and injury to the user. In the case where the first coil 2 is set at the top, since the accommodating chamber 1 accommodates the standard aerosol generating product, the first standard detection value f corresponding to the first coil 2 is std-top The first standard detection value f corresponding to the first coil when the accommodating chamber 1 is in the empty state bg-top Approximation, therefore, can be based on the first current detection value f exam-top The first standard detection value f of the standard aerosol generating product contained in the accommodating chamber 1 std-top or based on the first current detection value f exam-top and the first standard detection value f of the accommodating chamber 1 in the empty state bg-top In addition to determining whether the object 4 is a foreign object based on the detection value as the resonant frequency, it is also possible to determine whether the object 4 is a foreign object based on the detection value as the voltage value. For example, the first standard detection value V std-top and the first current detection value V exam-top , and based on the first current detection value V exam-top With the first standard detection value V std-top The difference value, such as the rate of change Whether the absolute value of falls within the absolute value of the first detection range [0,17)% determines whether the object to be detected 4 is a foreign object. As mentioned above, when the first coil 2 is set at the top, since the first coil 2 corresponds to the first standard detection value V when the accommodating chamber 1 accommodates the standard aerosol generating product, std-top The first standard detection value V corresponding to the first coil when the accommodating chamber 1 is in the empty state bg-top Approximately, therefore, it can also be based on the first current detection value V exam-top With the first standard detection value V bg-top Rate of change Determine whether the object to be tested 4 is a foreign object.

[0141] It should be noted that the "standard detection value" in this application (i.e., the detection value corresponding to the coil when the housing chamber accommodates a standard aerosol-generating product or the detection value corresponding to the coil when the housing chamber is in an empty state) can be pre-stored in the aerosol-generating device before it leaves the factory, without the need for user determination; or it can be determined by the user after the aerosol-generating device leaves the factory. For example, after the aerosol-generating device is activated, the user can determine the detection value corresponding to the coil (e.g., the first coil 2) when the housing chamber 1 is in an empty state as the standard detection value through the operation interface and save it in the aerosol-generating device. Alternatively, the user can insert one or more standard aerosol-generating products into the housing chamber 1 to determine the detection value corresponding to the coil when the housing chamber 1 accommodates a standard aerosol-generating product, and save it in the aerosol-generating device as the standard detection value. Alternatively, the user can manually adjust or input the standard detection value through the operation interface, which is not specifically limited here.

[0142] In other embodiments, the number of the first coil 2 is one, which can be arranged below the second coil 3, that is, along the length direction (such as Figure 11 The first coil 2 is arranged in the direction of the second coil 3 away from the opening of the accommodating chamber 1 for inserting the aerosol generating product. Similar to the case where the first coil 2 is arranged at the top, when the first coil 2 is arranged at the bottom of the accommodating chamber 1, it is possible to determine whether the object to be detected 4 is a foreign body based on the difference between the first current detection value and the first standard detection value of the accommodating chamber 1 in the empty state (such as the difference or the rate of change), or the difference between the first current detection value and the first standard detection value of the accommodating chamber 1 containing a standard aerosol generating product (such as the difference or the rate of change), which will not be repeated here. When the first coil 2 is arranged at the bottom of the accommodating chamber 1, small metal pieces, paper clips (such as Figure 16(as shown) falls into the accommodating chamber 1. When the first coil 2 and the second coil 3 are different types of coils (e.g., planar coils or solenoid coils), the first coil 2 can also be positioned in the middle of the accommodating chamber 1. When the first coil 2 is positioned at the bottom of the accommodating chamber 1, the absolute value of the first detection range can be, for example, [0, 150) kHz.

[0143] In other embodiments, reference Figures 11-13 The first coil 2 comprises two coils: a first upper coil and a first lower coil. The first upper coil is positioned above the second coil 3, while the first lower coil is positioned below the second coil 3. The first upper coil, the first lower coil, and the second coil 3 can each be connected to a corresponding resonant amplifier circuit to determine the electromagnetic signal corresponding to each coil. The second coil can also be switched from connection with the detection circuit to connection with the heating circuit via the first switch K1, causing the heating component to heat and heat the aerosol.

[0144] For example, when the accommodating chamber 1 contains a standard aerosol generating article, an AC signal of the resonant frequency of the standard aerosol generating article state is applied to the detection coils (e.g., the first coil 2 and the second coil 3), and the standard detection values ​​of the detection circuits corresponding to the top coil, the middle coil, and the bottom coil are measured respectively, for example, the standard voltage value V std-top 、V std-mid 、V std-bottom . Exemplarily, the first coil 2 includes a top coil and a bottom coil, and the second coil 3 includes a middle coil. As mentioned above, the standard detection value can be predetermined and stored in the aerosol generating device before leaving the factory, or can be determined and stored by the user instructing the detection circuit after leaving the factory, or directly input and stored by the user, or, when the accommodating cavity 1 is in an empty state, an AC signal of a resonant frequency is applied to the detection coil, and the standard detection values ​​of the detection circuits corresponding to the top coil, the middle coil and the bottom coil are measured respectively, for example, the standard voltage value V bg-top 、V bg-mid 、V bg-bottom , and then the standard detection value of the middle coil is corrected based on the preset correction term. Among them, the top coil (upper coil) can be understood as the coil along the length direction (such as Figure 11 The Z direction shown in FIG1 is not more than 10 mm from the insertion port of the accommodating cavity 1; the bottom coil (lower coil) can be understood as the area along the length direction (such as Figure 11 The Z direction shown is an area that is no more than 5 mm away from the bottom of the accommodating cavity 1; the middle coil can cover the entire area.

[0145] For example, refer to Figure 20When the user uses the aerosol generating device for the first time, after turning on the device, the user measures the standard detection values ​​of the top coil (upper coil) and / or bottom coil (lower coil) of the accommodating chamber 1 in the empty state (or called "cavity reference measurement"), and saves the standard detection values ​​to the memory of the aerosol generating device; inserts a standard aerosol generating product (or called "standard cigarette cartridge") into the accommodating chamber 1, measures the standard detection value of the middle coil of the accommodating chamber 1 under the standard aerosol generating product (or called "standard value calibration"), and saves it to the memory of the aerosol generating device. Or, inserts a standard aerosol generating product (or called "standard cigarette cartridge") into the accommodating chamber 1, measures the standard detection value of the upper and / or bottom of the accommodating chamber 1 and the middle coil under the standard aerosol generating product (or called "standard value calibration"), and saves it to the memory of the aerosol generating device. Combined with Figure 21 As shown, the user can also perform regular maintenance on the standard detection value, that is, re-measure the standard detection value of the top coil (upper coil) and / or the bottom coil (lower coil) of the accommodating chamber 1 in the empty state, and then update the re-measured standard detection value to the memory. When the user replaces another type of standard aerosol generating product (standard cigarette cartridge), re-measure the standard detection value of the middle coil under the accommodating chamber 1 that accommodates the replaced standard aerosol generating product, and update it to the memory as the standard detection value for the next foreign matter detection; or when the user replaces another type of standard aerosol generating product (standard cigarette cartridge), re-measure the standard detection value of the upper and / or bottom, and the middle coil under the accommodating chamber 1 that accommodates the replaced standard aerosol generating product, and update it to the memory as the standard detection value for the next foreign matter detection. After each standard detection value update, the detection range or detection threshold can be updated (the detection threshold is the upper limit of the detection range) to improve the accuracy of the detection.

[0146] After the object to be tested 4 is placed in the receiving chamber 1, an AC signal of the resonant frequency of the standard aerosol generating product state is applied to the detection coils (e.g., the first coil 2 and the second coil 3), and the current detection values ​​of the detection circuits corresponding to the top coil, the middle coil, and the bottom coil are respectively detected, for example, the current voltage value V exam-top 、V exam-mid 、V exam-bottom .

[0147] Based on the difference (e.g., change rate) between the current detection value (e.g., current voltage value) and the standard detection value (e.g., standard voltage value), it is determined whether the object to be detected 4 is a foreign object. For example, the voltage change rate can be determined by the following formula:

[0148]

[0149] In formula (1), δ exam-iIndicates the voltage change rate corresponding to the detection coil at position i, V exam-i Indicates the current voltage value corresponding to the detection coil at position i, V std-i Indicates the standard voltage value corresponding to the detection coil at position i, where i represents the top, middle, and bottom.

[0150] In some embodiments, when the voltage change rate δ exam-i If the object 4 does not fall within the detection range of the corresponding position, it is determined that the object 4 is a foreign object; when the voltage change rate δ exam-i When the object 4 falls within the detection range at the corresponding position, it is determined that the object 4 is a standard aerosol generating product, or the user determines whether it is the object 4 .

[0151] In other embodiments, the voltage change rate δ corresponding to the detection coil at the top position or the detection coil at the bottom position is determined. exam-i Whether it falls within the first detection range (for example, the absolute value of the first detection range is greater than or equal to 0 and less than 17%). When the voltage change rate δ of the detection coil at the top position or the detection coil at the bottom position exam-i If the object 4 does not fall within the first detection range, it is determined that the object 4 is a foreign object. exam-i When falling into the first detection range, determine the voltage change rate δ corresponding to the detection coil at the middle position exam-mid Whether it falls within the second detection range.

[0152] In determining the voltage change rate δ exam-mid If the voltage does not fall within the second detection range (for example, the absolute value of the second detection range is greater than or equal to 0 and less than 33%), the object to be detected 4 is determined to be a foreign object; when the voltage change rate δ is determined exam-mid When falling into the second detection range, determine the voltage change rate δ exam-mid Whether it falls within the third detection range (for example, the absolute value of the third detection range is greater than or equal to 0 and less than 17%).

[0153] In determining the voltage change rate δ exam-mid When the voltage change rate δ exam-mid When the object to be detected 4 falls within the second detection range but does not fall within the third detection range, the user determines whether the object to be detected 4 is a foreign object through the operation interface.

[0154] In some other embodiments, different from the above-mentioned embodiments based on the rate of change, reference Figure 22, the detection method can also be determined based on the difference. Exemplarily, when the detection is started, the top coil (upper coil) is first detected to determine whether the absolute value of the resonant frequency difference between the current detection value of the top coil and the standard detection value is less than 150kHz, or whether the absolute value of the voltage difference is less than 0.5V, that is, whether it falls into the first detection range. When the absolute value of the resonant frequency difference between the current detection value of the top coil and the standard detection value is greater than or equal to 150kHz, or the absolute value of the voltage difference is greater than or equal to 0.5V, that is, it does not fall into the first detection range, it is determined that the object to be detected is a foreign object, the protection is turned on, the heating is stopped, and the aerosol generating device is in a non-heating state; when the absolute value of the difference between the current detection value of the top coil and the standard detection value falls into the first detection range, the bottom coil (lower coil) is further detected to determine whether the absolute value of the resonant frequency difference between the current detection value of the bottom coil and the standard detection value is less than 150kHz, or whether the absolute value of the voltage difference is less than 0.5V, that is, whether it falls into the first detection range.

[0155] When the absolute value of the resonant frequency difference between the current detection value of the bottom coil and the standard detection value is greater than or equal to 150kHz, or the absolute value of the voltage difference is greater than or equal to 0.5V, that is, it does not fall within the first detection range, the object to be tested is determined to be a foreign object, the protection is turned on, the heating is stopped, and the aerosol generating device is in a non-heating state; when the absolute value of the difference between the current detection value of the bottom coil and the standard detection value falls within the first detection range, the middle coil is further detected.

[0156] When the absolute value of the difference between the resonant frequency of the current detection value of the middle coil and the standard detection value is greater than or equal to 300kHz, or the absolute value of the voltage difference is greater than or equal to 1V, that is, it does not fall within the second detection range, it is determined that the object to be tested is a foreign object, the protection is turned on, the heating is terminated, and the aerosol generating device is in a non-heating state; when the absolute value of the difference between the resonant frequency of the current detection value of the middle coil and the standard detection value is less than 300kHz, or the absolute value of the voltage difference is less than 1V, that is, it falls within the second detection range, it is determined whether the absolute value of the difference between the resonant frequency of the current detection value of the middle coil and the standard detection value is less than 150kHz, or whether the absolute value of the voltage difference is less than 0.5V.

[0157] If the absolute value of the difference between the resonant frequency of the current detection value of the central coil and the standard detection value is greater than or equal to 150 kHz and less than 300 kHz, or the absolute value of the voltage difference is greater than or equal to 0.5 V and less than 1 V, i.e., it falls within the second detection range but not the third detection range, the user confirms on the operation interface whether to enable heating. If the absolute value of the difference between the resonant frequency of the current detection value of the central coil and the standard detection value is less than 150 kHz, or the absolute value of the voltage difference is less than 0.5 V, i.e., it falls within the third detection range, the object to be tested is determined to be a standard aerosol-generating article, heating is enabled, and the aerosol generating device is in a heating state.

[0158] In some embodiments, the PCB includes a flexible PCB and a non-flexible PCB, which are electrically connected via leads. This arrangement allows for a more compact structure for the aerosol-generating device. Furthermore, the flexible PCB is printed with a first coil and a second coil, while the non-flexible PCB is equipped with a signal conditioning module and a processor. The non-flexible PCB can be rectangular and nested within the components of the aerosol-generating device, enhancing robustness and reliability.

[0159] In some embodiments, the first coil and / or the second coil are planar detection coils and are fixed to a printed circuit board. The inventors have discovered that when the position of the object to be detected 4 changes slightly, the detection circuit can more sensitively sense the electromagnetic signal of the planar coil, thereby improving the detection sensitivity of the aerosol generating device.

[0160] In a fourth aspect, the present application further provides an aerosol generating device, comprising:

[0161] a receiving chamber for receiving an aerosol-generating article;

[0162] Second coil;

[0163] A PCB board is provided with a circuit, the circuit including a detection circuit, a heating circuit, and a first switch, one end of the first switch is connected to the second coil, and the other end of the first switch is connected to the detection circuit or the heating circuit; the detection circuit includes:

[0164] a second resonant amplifying circuit, configured to determine the electromagnetic signal of the second coil, the second resonant amplifying circuit comprising a second inductor, a second resistor, and a second capacitor, wherein the second inductor and the second resistor are derived from the connected second coil;

[0165] a signal conditioning module, configured to condition the electromagnetic signal from the second resonant amplifying circuit into a weak electric signal;

[0166] The processor is used to process the weak electric signal from the signal conditioning module to determine a second detection value, and the second detection value is used to determine whether the object to be tested placed in the accommodating cavity is a foreign object, so as to put the aerosol generating device into a heating state or a non-heating state.

[0167] According to an aerosol generating device provided by the present application, it is possible to determine whether the object to be tested is a foreign object based on a second detection value, so that the aerosol generating device is in a heating state or a non-heating state, thereby avoiding the abnormal activation of the heating system of the aerosol generating device due to the insertion of a foreign object containing a metal body when the aerosol generating device is not in normal use, thereby avoiding the risk of local overheating, short circuit, or component burning of the device due to incorrect energy transmission to the foreign metal body, realizing the dimensional upgrade of the aerosol generating device from "circuit safety" to "electromagnetic safety", providing protection for the reliability and user safety of the electromagnetic induction aerosol generating device, and at the same time, through the first switch, the second coil detection and heating functions can be reused to ensure the compact and simplified structure of the smoking device. For the specific introduction of each component and circuit, please refer to the description of the first to third aspects above, which will not be repeated here.

[0168] In order to improve the accuracy of voltage sensitivity, the inventors further studied the factors affecting the voltage change rate based on the mutual inductance coupling model.

[0169] The mutual inductive coupling model between the detection coil (such as the first coil and the second coil) and the metal foreign body is as follows: Figure 18 As shown. According to Faraday's law of electromagnetic induction, when a bulk conductor is placed in an alternating magnetic field or moves in a fixed magnetic field, an induced current is generated in the conductor and closed in the conductor. Therefore, the metal foreign body under the eddy current effect can be equivalent to a short-circuit loop current model. In this case, the metal foreign body can be equivalent to a coil. Figure 18 As shown, L D Represents the self-inductance of the detection coil, R D Indicates the internal resistance of the detection coil, I D Indicates the current flowing through the detection coil; L H Represents the self-inductance of the metal foreign body, R H Indicates the internal resistance of the metal foreign body, I H represents the current flowing through the metal foreign object; M represents the mutual inductance between the metal foreign object and the detection coil.

[0170] The induced electromotive force V on the detection coil mD It can be expressed as:

[0171] V mD =jωMI H (2)

[0172] In formula (2), V mDrepresents the induced electromotive force on the detection coil; j represents the imaginary unit; ω represents the angular frequency of the alternating voltage; M represents the mutual inductance between the metal foreign body and the detection coil; I H Indicates the current flowing through a metallic foreign object.

[0173] The total voltage V on the detection coil D can be expressed as:

[0174] V D =Z D I D +V mD =Z D I D +jωMI H (3)

[0175] In formula (3), V D Represents the total voltage on the detection coil; Z D Indicates the impedance of the detection coil when no detection coil is placed; I D Represents the current flowing through the detection coil; V mD represents the induced electromotive force on the detection coil; j represents the imaginary unit; ω represents the angular frequency of the alternating voltage; M represents the mutual inductance between the metal foreign body and the detection coil; I H Indicates the current flowing through a metallic foreign object.

[0176] The induced electromotive force V on the metal foreign body mH It can be expressed as:

[0177] V mH =jωMI D (4)

[0178] In formula (4), V mH represents the induced electromotive force on the metal foreign body; j represents the imaginary unit; ω represents the angular frequency of the alternating voltage; M represents the mutual inductance between the metal foreign body and the detection coil; I D Indicates the current flowing through the detection coil.

[0179] The total voltage V on the metal foreign body H It can be expressed as:

[0180] V H =Z H I H +V mH =Z H I H +hωMI D (5)

[0181] Formula (5), V H Indicates the total voltage on the metal foreign body; Z H Indicates the impedance of metal foreign matter; IH Indicates the current flowing through the metal foreign body; V mH represents the induced electromotive force on the metal foreign body; j represents the imaginary unit; ω represents the angular frequency of the alternating voltage; M represents the mutual inductance between the metal foreign body and the detection coil; I D Indicates the current flowing through the detection coil.

[0182] Since the metal foreign body is equivalent to a short-circuit current model, the total voltage V H =0, that is, formula (5) can be expressed as:

[0183] V H =Z H I H +jωMI D =0,

[0184] Solve I H ,Right now

[0185]

[0186] Substituting formula (6) into formula (3), we can obtain:

[0187]

[0188] Simplified:

[0189]

[0190] Divide formula (11) by I D , we can get the equivalent impedance Z of the detection coil eq :

[0191]

[0192] Substituting formula (9) into formula (8) and separating the real and imaginary parts, we can obtain:

[0193]

[0194] Among them, the real part coefficient is also the proportional coefficient of the internal resistance change of the detection coil The imaginary part coefficient is also the proportional coefficient of the detection coil's self-inductance change

[0195] refer to Figure 9 and Figure 10 Due to the virtual short and virtual open characteristics of the amplifier, the AC voltage U ACUnder certain conditions, the current flowing through the detection coil is the same when there is no metal foreign object (i.e., before the metal foreign object is placed) and when there is a metal foreign object (i.e., after the metal foreign object is placed). Therefore, the voltage change of the detection coil before and after the metal foreign object is placed is equal to its impedance change, that is, the impedance change rate of the detection coil is equal to the voltage change rate δ, which can be expressed as,

[0196]

[0197] in,

[0198] In formula (11), δ represents the impedance change rate (or voltage change rate) of the detection coil; Z eq Indicates the equivalent impedance of the detection coil when a metal foreign object is placed; Z D Indicates the impedance of the detection coil when no metal foreign matter is placed; Q D is the equivalent quality factor of the detection coil; β is the proportional coefficient of the change of the internal resistance of the detection coil; α is the proportional coefficient of the change of the self-inductance of the detection coil.

[0199] It can be seen that the impedance change rate (or voltage change rate) δ of the detection coil is related to the mutual inductance M of the heating body to the detection coil. Therefore, the impedance change rate (or voltage change rate) δ of the detection coil can be increased by increasing the mutual inductance M.

[0200] Refer to formula (1), voltage sensitivity In other words, by increasing the mutual inductance M, the impedance change rate (or voltage change rate) δ of the detection coil can be increased, thereby improving the accuracy of the voltage sensitivity S.

[0201] The inventors have also found that by designing a reasonable detection coil structure and size, the mutual inductance M can be increased. In other words, depending on the structure of the metal foreign body to be detected, the mutual inductance M can be increased by designing a corresponding detection coil, thereby improving the detection accuracy.

[0202] According to the law of electromagnetic induction, the induced current in the metal foreign body is proportional to the strength of the induced magnetic field generated by the detection coil and its component perpendicular to the surface of the metal foreign body. Therefore, increasing the strength of the induced magnetic field and its vertical component are key factors in improving the mutual inductance M. Therefore, the detection coil is optimized from the following aspects, including but not limited to: (1) The detection coil adopts a multi-turn spiral structure design to improve the strength of the induced magnetic field. The number of turns and layers of the coil can be adjusted according to the detection accuracy requirements, but it needs to be designed in combination with the frequency and inductance value to avoid the resonant frequency being too low; (2) The plane (cross section) of the detection coil should be as parallel as possible to the plane of the metal foreign body (i.e., the plane with the largest cross-sectional area), and the distance should be kept within a small range to increase the vertical component of the magnetic field; (3) The design of the detection coil should ensure that its center position is aligned with the center of the metal foreign body, thereby optimizing the distribution of the vertical component of the magnetic field; (4) The diameter of the detection coil should match the size of the metal foreign body to ensure that the induced magnetic field can completely cover the surface of the metal foreign body; (5) In the design of the multi-layer spiral detection coil, the spacing between the layers should be minimized to improve the uniformity and coupling strength of the magnetic field.

[0203] Figures 19a to 19d The following is a diagram showing the structure of the detection coil provided in some embodiments of the present application. Figures 19a to 19d Specifically, depending on the structure of the metal foreign body to be detected, the mutual inductance M can be increased by providing a corresponding detection coil on the detection device, thereby improving the detection accuracy.

[0204] For flat, thin-film or large-area metal foreign bodies to be detected, the following methods can be used: Figure 19a The planar spiral detection coil shown ( Figure 19a The difference between the left and right images in the figure is the number of turns, but both have a planar spiral structure. Planar spiral coils can generate a uniform induced magnetic field within a planar area, with the largest vertical component, making them suitable for covering large planar areas.

[0205] For long strips or rectangular cross-section metal foreign bodies to be detected, the following methods can be used: Figure 19b The planar rectangular detection coil shown in the figure. The induced magnetic field of the planar rectangular coil is mainly concentrated in the long strip area, which is suitable for matching with strip-shaped metal foreign objects.

[0206] For metal foreign bodies with cylindrical, annular or axisymmetric structures, the following methods can be used: Figure 19c The cylindrical solenoid type detection coil shown in the figure has the largest axial magnetic field strength, so it is suitable for surrounding a cylindrical heating body and generating an induced magnetic field with a strong vertical component.

[0207] For dispersed, locally characteristic or small metal foreign bodies to be detected (such as locally asymmetric metal foreign bodies, metal foreign bodies with complex geometric structures), the following methods can be used: Figure 19dThe short dipole-pair spiral detection coil shown. The short dipole-pair spiral coil can generate a strong local magnetic field, so its distribution is suitable for small and complex geometric heating objects, especially for local detection.

[0208] Table 1 shows the planar spiral detection coil (such as Figure 19a As shown) in the series resonant amplifier circuit (such as Figure 8 Parameter design example shown in ).

[0209] Table 1 Planar spiral detection coil (such as Figure 19a As shown) in the series resonant amplifier circuit (such as Figure 9 Parameter design example in

[0210] parameter Numerical <![CDATA[Self-inductance L of the detection coil when no metal foreign object to be measured is placed D > 10μH <![CDATA[Internal resistance R of the detection coil when no metal foreign object to be measured is placed D > 3Ω AC excitation source frequency f 3MHz

[0211] It should be noted that the parameters of the detection coil, such as self-inductance L D and internal resistance R D , can be determined by combining theoretical calculation, simulation analysis and experimental measurement. Specifically, the self-inductance L is accurately calculated by electromagnetic simulation software using the geometric dimensions and material properties of the detection coil. D At the same time, combined with the simulation analysis of the material resistivity of the wire and the high-frequency skin effect, the internal resistance R D In addition, the actual electrical parameters of the detection coil are experimentally measured and verified using an impedance analyzer or LCR meter to ensure the accuracy of the values ​​in Table 1.

[0212] AC voltage (AC excitation source) U AC The selection of frequency f can be determined by the following principles: first, ensure that the excitation frequency matches the operating frequency range of the detection coil and the electromagnetic characteristics of the metal foreign body to be detected; second, while improving the detection sensitivity, avoid electromagnetic interference and excessive circuit loss caused by excessive frequency.

[0213] The first capacitor C can be adjusted according to the AC excitation source U AC The frequency f and the self-inductance L of the detection coil D Resonance matching is determined, please refer to the following formula for details:

[0214]

[0215] In the AC voltage (AC excitation source) U AC The frequency f is 3MHz and the self-inductance of the detection coil L D When the capacitance is 10μH, the theoretical value is about 177pF. At the same time, through simulation optimization and experimental debugging, the actual capacitance value used is finally determined to achieve the best resonance performance. The fourth resistor R1 can be adjusted according to the amplification factor of the required resonant amplifier circuit. In some embodiments, the diode De You can use LRB521S-40T1G model, the third capacitor C e The resistance value of 1 is 10 kΩ, and the capacitance value of the third capacitor Ce is 190 nF.

[0216] The inventors also found that for induction heating products of smoking devices, metal foreign matter of different sizes, materials and shapes can be attributed to the different effects of the metal foreign matter on the equivalent impedance (including equivalent self-inductance and equivalent internal resistance) of the detection coil; and for induction heating products of cigarettes, in addition to the parameters of the metal foreign matter itself (size, material, shape), the different positions of the metal foreign matter relative to the detection coil can also be attributed to the effect of the metal foreign matter on the equivalent impedance of the detection coil.

[0217] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A detection method for an aerosol generating device, wherein the aerosol generating device is provided with a receiving chamber for receiving an electromagnetic induction aerosol generating product, characterized in that: The aerosol generating device includes a first coil, and the detection method includes: determining a first standard detection value corresponding to the first coil when the accommodating chamber is in an empty state or when the accommodating chamber accommodates a standard aerosol-generating article; When the object to be tested is placed in the accommodating cavity, determining a first current detection value corresponding to the first coil; Based on the first standard detection value and the first current detection value, it is determined whether the object to be detected is a foreign object, so that the aerosol generating device is in a heating state or a non-heating state.

2. The detection method for an aerosol generating device according to claim 1, wherein: The aerosol generating device further includes a second coil, the first coil and the second coil are arranged along the length direction of the accommodating cavity, and the second coil can be connected to a heating circuit and a detection circuit respectively. When the aerosol generating device is in the non-heating state, the first coil and the second coil are respectively connected to the detection circuit. The detection method includes: determining a second standard detection value corresponding to the second coil when the accommodating chamber is in an empty state or when the accommodating chamber accommodates a standard aerosol-generating article; When the object to be tested is placed in the accommodating cavity, a first current detection value corresponding to the first coil and a second current detection value corresponding to the second coil are respectively determined; Based on the first standard detection value, the second standard detection value, the first current detection value, and the second current detection value, it is determined whether the object to be detected is a foreign object, so that the aerosol generating device is in the heating state or the non-heating state.

3. The detection method for an aerosol generating device according to claim 2, wherein: The step of determining whether the object to be detected is a foreign object based on the first standard detection value, the second standard detection value, the first current detection value, and the second current detection value, so as to place the aerosol generating device in the heating state or the non-heating state, includes: determining whether a first detection difference value between the first current detection value and the first standard detection value falls within a first detection range; If it is determined that the first detection difference value does not fall within the first detection range, determining that the object to be detected is a foreign object, so that the aerosol generating device is in the non-heating state; When it is determined that the first detection difference value falls within the first detection range, it is determined whether the second detection difference value between the second current detection value and the second standard detection value falls within the second detection range to determine whether the object to be detected is a foreign object, so that the aerosol generating device is in the heating state or the non-heating state.

4. The detection method for an aerosol generating device according to claim 3, wherein: The step of determining whether a second detection difference between the second current detection value and the second standard detection value falls within a second detection range to determine whether the object to be detected is a foreign object, so as to place the aerosol generating device in the heating state or the non-heating state, includes: If it is determined that the second detection difference value does not fall within the second detection range, determining that the object to be detected is a foreign object, so that the aerosol generating device is in the non-heating state; If it is determined that the second detection difference value falls within the second detection range, determining that the object to be detected is a standard aerosol-generating article, so that the aerosol-generating device is in the heating state; or When it is determined that the second detection difference value falls within the second detection range, determine whether the second detection difference value falls within the third detection range; when it is determined that the second detection difference value does not fall within the third detection range but falls within the second detection range, the user determines whether the object to be tested is a foreign object, so that the aerosol generating device is in the heating state or the non-heating state; when it is determined that the absolute value of the second detection difference value falls within the third detection range, determine that the object to be tested is a standard aerosol generating product, so that the aerosol generating device is in the heating state; the second detection range covers the third detection range.

5. The detection method for an aerosol generating device according to claim 4, wherein: The first detection difference value is the difference between the first current detection value and the first standard detection value, and the second detection difference value is the difference between the second current detection value and the second standard detection value; or, the first detection difference value is the rate of change between the first current detection value and the first standard detection value, and the second detection difference value is the rate of change between the second current detection value and the second standard detection value.

6. A circuit capable of being used in an aerosol generating device, wherein the aerosol generating device is provided with a receiving cavity for receiving an electromagnetic induction aerosol generating product, characterized in that: The aerosol generating device comprises a first coil, and the circuit comprises: Detection circuit, including: a first resonant amplifying circuit, configured to determine the electromagnetic signal of the first coil, wherein the first resonant amplifying circuit comprises a first inductor, a first resistor, and a first capacitor, wherein the first inductor and the first resistor are derived from the connected first coil; a signal conditioning module, configured to condition the electromagnetic signal from the first resonant amplifying circuit into a weak electric signal; A processor is used to process the weak current signal from the signal conditioning module to determine a first detection value, wherein the first detection value is used to determine whether the object to be tested placed in the containing cavity is a foreign object, so as to put the aerosol generating device into a heating state or a non-heating state.

7. The circuit for an aerosol generating device according to claim 6, wherein: include: A first switch and a heating circuit, the aerosol generating device further includes a second coil, one end of the first switch is connected to the second coil, and the other end of the first switch is connected to the detection circuit or the heating circuit.

8. The circuit for an aerosol generating device according to claim 7, wherein: The detection circuit includes a second resonant amplification circuit, and the other end of the first switch is connected to the second resonant amplification circuit, which is used to determine the electromagnetic signal of the second coil, and the second resonant amplification circuit includes a second inductor, a second resistor and a second capacitor, wherein the second inductor and the second resistor come from the connected second coil; the signal conditioning module is used to condition the electromagnetic signal from the second resonant amplification circuit into a weak current signal; the processor is used to process the weak current signal to determine a second detection value, and the second detection value is used to determine whether the object to be tested placed in the containing cavity is a foreign object, so that the aerosol generating device is in the heating state or the non-heating state; and / or, the processor is capable of executing the detection method as described in any one of claims 2 to 5.

9. An aerosol generating device, characterized in that: include: A receiving chamber for receiving an electromagnetic induction aerosol generating product; First coil; A PCB board is provided with a circuit, wherein the circuit includes a detection circuit, including: a first resonant amplifying circuit, configured to determine the electromagnetic signal of the first coil, the first resonant amplifying circuit comprising a first inductor, a first resistor, and a first capacitor, wherein the first inductor and the first resistor are derived from the connected first coil; a signal conditioning module, configured to condition the electromagnetic signal from the first resonant amplifying circuit into a weak electric signal; A processor is used to process the weak current signal from the signal conditioning module to determine a first detection value, wherein the first detection value is used to determine whether the object to be tested placed in the containing cavity is a foreign object, so as to put the aerosol generating device into a heating state or a non-heating state.

10. The aerosol generating device according to claim 9, wherein The aerosol generating device includes a second coil; the circuit includes a first switch and a heating circuit, one end of the first switch is connected to the second coil, and the other end of the first switch is connected to the detection circuit or the heating circuit.

11. The aerosol generating device according to claim 10, wherein: The aerosol generating device satisfies at least one or more of the following conditions: The first switch comprises a single-pole double-throw switch or a transistor; The first coil includes a plurality of coils, and along the length direction of the accommodating cavity, one or more coils of the plurality of coils are arranged above the second coil, and one or more coils of the plurality of coils are arranged below the second coil; The first resonant amplifying circuit includes a plurality of first coils, and each of the first coils is connected to each first resonant amplifying circuit respectively; The first coil includes two coils, a first upper coil and a first lower coil, wherein the first upper coil is arranged above the second coil, and the first lower coil is arranged below the second coil; The first coil and / or the second coil include a planar coil and / or a solenoid coil; The PCB board includes a flexible PCB board and a non-flexible PCB board, the first coil and the second coil are printed on the flexible PCB board, and the signal conditioning module and the processor are provided on the non-flexible PCB board; The processor is capable of executing the detection method according to any one of claims 2 to 5.

12. An aerosol generating device, characterized in that: include: a receiving chamber for receiving an aerosol-generating article; Second coil; A PCB board is provided with a circuit, the circuit including a detection circuit, a heating circuit, and a first switch, one end of the first switch is connected to the second coil, and the other end of the first switch is connected to the detection circuit or the heating circuit; the detection circuit includes: a second resonant amplifying circuit, configured to determine the electromagnetic signal of the second coil, wherein the second resonant amplifying circuit comprises a second inductor, a second resistor, and a second capacitor, wherein the second inductor and the second resistor are from the connected second coil; a signal conditioning module, configured to condition the electromagnetic signal from the second resonant amplifying circuit into a weak electric signal; A processor is used to process the weak current signal from the signal conditioning module to determine a second detection value, wherein the second detection value is used to determine whether the object to be tested placed in the containing cavity is a foreign object, so as to put the aerosol generating device into a heating state or a non-heating state.

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