Method for controlling aerosol generating device, aerosol generating device, and induction coil

Abstract

The invention provides a control method of an aerial fog generating device, the aerial fog generating device and an induction coil. The aerosol-generating device includes an induction coil to induce a sensitive heating element to heat the aerosol-generating article; the induction coil comprises a first part and a second part which are longitudinally arranged; the method comprises the following steps: connecting a first part with a capacitor in a first time period to form an LC oscillator, so that the first part independently generates a magnetic field; and simultaneously connecting the first part and the second part with the capacitor in a second time stage to form an LC oscillator, so that the first part and the second part simultaneously generate a magnetic field. According to the control method of the aerosol generating device, the first part of the induction coil can be rapidly and independently induced and heated at the first time stage, so that aerosol can be rapidly output to the filtering suction nozzle; and the first part and the second part of the induction coil are subjected to induction heating at the same time in the second time stage, so that the output amount or the taste of the aerosol is kept uniform.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of heat-not-burn aerosol generation, and in particular to a control method of an aerosol generating device, an aerosol generating device, and an induction coil. Background Art

[0002] Smoking articles (eg, cigarettes, cigars, etc.) burn tobacco during use to produce tobacco smoke. People have attempted to replace these tobacco-burning articles by creating products that release compounds without combustion.

[0003] An example of such a product is a heating device that releases a compound by heating rather than burning a material. For example, the material may be tobacco or other non-tobacco products that may or may not contain nicotine. A known heating device, such as patent CN113853128A, proposes induction heating of tobacco or other non-tobacco products in sections by two or more induction coils. Summary of the invention

[0004] One embodiment of the present application provides a control method for an aerosol generating device, the aerosol generating device comprising:

[0005] an induction coil configured to generate a changing magnetic field to induce the receptive heating element to heat the aerosol generating article; the induction coil comprising at least a first portion and a second portion arranged in a longitudinal direction;

[0006] capacitance;

[0007] The method comprises:

[0008] In a first time stage, the first part is connected to the capacitor to form an LC oscillator, so that the first part alone generates a changing magnetic field;

[0009] In a second time period, the first part and the second part are connected to the capacitor at the same time to form an LC oscillator, so that the first part and the second part generate a changing magnetic field at the same time.

[0010] In some embodiments, there is an interval of 10s to 20s between the first time stage and the second time stage.

[0011] Another embodiment of the present application further provides a control method for an aerosol generating device, the aerosol generating device comprising:

[0012] an induction coil configured to generate a changing magnetic field to induce a receptive heating element to heat an aerosol-generating article; the heating element comprising a first section and a second section arranged in a longitudinal direction; and the induction coil comprising:

[0013] a first helical coil including a first portion surrounding the first segment and a second portion surrounding the second segment;

[0014] a second spiral coil surrounding the first section and avoiding the second section;

[0015] The method comprises:

[0016] In a first time period, directing an alternating current to flow through the second spiral coil so that the second spiral coil generates a changing magnetic field to induce heating of the first section;

[0017] During a second time period, an alternating current is directed to flow through the first spiral coil so that the first portion and the second portion of the first spiral coil generate a changing magnetic field to induce heating of the first section and the second section simultaneously.

[0018] Another embodiment of the present application further provides an aerosol generating device, which is configured to heat an aerosol generating article to generate an aerosol; comprising:

[0019] an induction coil configured to generate a changing magnetic field to induce the receptive heating element to heat the aerosol generating article; the induction coil comprising at least a first portion and a second portion arranged in a longitudinal direction;

[0020] capacitance;

[0021] The circuit is arranged to selectively connect one or both of the first part and the second part to the capacitor to form an LC oscillator, so that one of the first part and the second part generates a changing magnetic field alone or both of them generate a changing magnetic field simultaneously.

[0022] In some embodiments, the induction coil includes a first connection tap, a second connection tap, and a third connection tap arranged in sequence at different positions along the longitudinal direction, thereby dividing the single induction coil into the first part located between the first connection tap and the second connection tap, and the second part located between the second connection tap and the third connection tap.

[0023] In some embodiments, the circuit is arranged to form an LC oscillator by connecting one of the first part and the second part with the capacitor, thereby driving one of the first part and the second part to generate a changing magnetic field individually.

[0024] In some embodiments, the circuit is configured to:

[0025] In a first time stage, the first part is connected to the capacitor to form an LC oscillator, so that the first part alone generates a changing magnetic field;

[0026] In a second time period, the first part and the second part are connected to the capacitor at the same time to form an LC oscillator, so that the first part and the second part generate a changing magnetic field at the same time.

[0027] In some embodiments, the circuit comprises:

[0028] a first switch configured to operably connect the first portion to the capacitor to form an LC oscillator; and

[0029] A second switch is configured to operably connect the second portion to the capacitor to form an LC oscillator.

[0030] In some embodiments, the circuit further comprises:

[0031] The inverter is used to drive the LC oscillator to oscillate.

[0032] In some embodiments, the second connection tap is connected to the capacitor;

[0033] The first connection tap is connected to the inverter via a first switch;

[0034] The third connection tap is connected to the inverter via a second switch.

[0035] Another embodiment of the present application further provides an aerosol generating device, which is configured to heat an aerosol generating article to generate an aerosol; comprising:

[0036] an induction coil configured to generate a changing magnetic field to induce a receptive heating element to heat an aerosol-generating article; the heating element comprising a first section and a second section arranged in a longitudinal direction; and the induction coil comprising:

[0037] a first helical coil including a first portion surrounding the first segment and a second portion surrounding the second segment;

[0038] a second spiral coil surrounding the first section and avoiding the second section;

[0039] The circuit is configured to selectively guide an alternating current to flow through one of the first spiral coil and the second spiral coil, thereby selectively causing the first spiral coil to generate a magnetic field to induce simultaneous heating of the first segment and the second segment of the heating element, or causing the second spiral coil to generate a magnetic field to induce heating of the first segment of the heating element.

[0040] Another embodiment of the present application further provides an aerosol generating device, which is configured to heat an aerosol generating article to generate an aerosol; comprising:

[0041] an induction coil configured to generate a varying magnetic field to induce a receptive heating element to heat the aerosol-generating article; the heating element comprising a first section and a second section arranged in a longitudinal direction;

[0042] The circuit is configured as:

[0043] In a first time period, the induction coil generates a magnetic field penetrating the first section, so that the first section is heated alone;

[0044] In a second time period, the induction coil generates a magnetic field that penetrates the first section and the second section simultaneously, so that the first section and the second section are heated simultaneously.

[0045] In some embodiments, the induction coil includes a first portion and a second portion arranged in a longitudinal direction; the first portion is arranged around the first section, and the second portion is arranged around the second section;

[0046] The circuit is configured as:

[0047] directing an alternating current only in the first portion during the first time period, so that only the first portion generates a magnetic field penetrating the first section;

[0048] During the second time period, an alternating current is simultaneously conducted to the first portion and the second portion, so that the induction coil generates a magnetic field that simultaneously penetrates the first section and the second section.

[0049] In some embodiments, the induction coil comprises:

[0050] a first helical coil including a first portion surrounding the first segment and a second portion surrounding the second segment;

[0051] a second spiral coil surrounding the first section and avoiding the second section;

[0052] The circuit is configured as:

[0053] During the first time period, an alternating current is guided only to the second spiral coil, so that only the second spiral coil generates a magnetic field penetrating the first section;

[0054] During the second time period, an alternating current is conducted to the first spiral coil, so that the first spiral coil generates a magnetic field that penetrates both the first section and the second section.

[0055] In some embodiments, the induction coil comprises:

[0056] A first connection tap, a second connection tap and a third connection tap arranged in sequence at different positions in the longitudinal direction;

[0057] The second helical coil is connected between the first connection tap and the second connection tap;

[0058] The first helical coil is connected between the first connection tap and the third connection tap.

[0059] Another embodiment of the present application further provides an induction coil for an aerosol generating device, comprising:

[0060] A first connection tap, a second connection tap, and a third connection tap arranged at different positions in the longitudinal direction;

[0061] A first spiral coil connected between the first connection tap and a third connection tap;

[0062] The second spiral coil is connected between the first connection tap and the second connection tap.

[0063] The above control method of the aerosol generating device is conducive to quickly inducing heating of the first part of the induction coil alone in the first time stage, so as to quickly output the aerosol to the filter mouthpiece; and inducing heating of the first part and the second part of the induction coil at the same time in the second time stage, which is conducive to maintaining a uniform amount or taste of the aerosol output. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0065] Figure 1 is a schematic diagram of an aerosol generating device provided by an embodiment;

[0066] Figure 2 yes Figure 1 A schematic diagram of the structure of the heating element from one perspective;

[0067] Figure 3 yes Figure 1 A schematic diagram of a plurality of connection taps provided on the induction coil and connected to a circuit board;

[0068] Figure 4 is a schematic diagram of basic components of a circuit of one embodiment;

[0069] Figure 5 is a schematic diagram of basic components of a circuit of yet another embodiment;

[0070] Figure 6 is a schematic diagram of an induction coil of yet another embodiment;

[0071] Figure 7 is a schematic diagram of an induction coil of yet another embodiment;

[0072] Figure 8 is a schematic diagram of a heating process in which an induction heating element is heated in one embodiment;

[0073] Fig. 9 Schematic diagram of a heating process of inducing heating of a heating element in yet another embodiment. DETAILED DESCRIPTION

[0074] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific implementation methods.

[0075] One embodiment of the present application provides an aerosol generating device 100 that heats, rather than burns, an aerosol generating product 1000, such as a cigarette, so that at least one component of the aerosol generating product 1000 is volatilized or released to form an aerosol for inhalation, for example Figure 1 shown.

[0076] In an optional implementation, the aerosol generating article 1000 may optionally use a tobacco-containing material that releases volatile compounds from the substrate when heated; or it may also be a non-tobacco material that is suitable for electric heating and smoking after heating. The aerosol generating article 1000 may optionally use a solid substrate, which may include one or more of powder, particles, fragments, strips, or flakes of one or more of herb leaves, tobacco leaves, homogenized tobacco, and expanded tobacco; or the solid substrate may contain additional tobacco or non-tobacco volatile flavor compounds to be released when the substrate is heated.

[0077] according to Figure 1 As shown, after the aerosol generating article 1000 is received in the aerosol generating device 100, a portion thereof is exposed outside the aerosol generating device 100, such as a filter tip, which is advantageous for a user to inhale.

[0078] The structure of the aerosol generating device 100 according to one embodiment of the present application can be seen in Figure 1 As shown, the overall appearance of the device is roughly constructed in the shape of a flat cylinder, and the external components of the aerosol generating device 100 include:

[0079] The housing 10 is hollow inside, thereby forming an assembly space for necessary functional components such as electronic devices and heating devices; the housing 10 has a proximal end 110 and a distal end 120 opposite to each other along the length direction. Figure 1 As shown, the aerosol generating device 100 further includes:

[0080] a receiving opening 111 located at the proximal end 110; in use, the aerosol generating article 1000 can be at least partially received in the housing 10 through the receiving opening 111, or removed from the housing 10 through the receiving opening 111;

[0081] a chamber for receiving at least a portion of the aerosol generating article 1000 extending into the housing 10 through the receiving opening 111; the chamber is at least partially surrounded or defined by the heating element 50 in this embodiment;

[0082] The air passage 150 is surrounded or defined by a wall 151 located between the chamber and the air inlet 121; the air passage 150 is located between the chamber and the air inlet 121, and thus in use, the air passage 150 provides a passage path from the air inlet 121 into the chamber / aerosol generating article 1000, such as Figure 1 As shown by the middle arrow R1; and during inhalation, air enters the aerosol generating product 1000 through the air channel 150, and carries the generated aerosol through the aerosol generating product 1000 and is inhaled by the user.

[0083] according to Figure 1 As shown, the aerosol generating device 100 further includes:

[0084] A battery cell 130 for power supply; optionally, the battery cell 130 is a rechargeable DC battery cell 130 and can be charged by connecting to an external power source;

[0085] The circuit board 140 is provided with a circuit.

[0086] See also Figure 1 As shown, the aerosol generating device 100 further includes:

[0087] The heating element 50 is configured to be in a tubular shape surrounding or defining a chamber; the heating element 50 is used to heat the aerosol generating article 1000; in this embodiment, the heating element 50 is an electromagnetic induction heating element that generates heat by being penetrated by a changing magnetic field.

[0088] Or in some other variations, the heating element 50 can be configured to be a pin, a needle, or a sheet, etc., which is inserted into the aerosol generating article 1000 for heating.

[0089] In some implementations, the heating element 50 is made of a receptive metal or alloy material, which may include a ferromagnetic material such as ferromagnetic iron, ferromagnetic steel, or 420 grade or 430 grade stainless steel, or an alloy containing carbon.

[0090] See also Figure 1 As shown, the aerosol generating device 100 further includes:

[0091] The induction coil 40 at least partially surrounds the heating element 50 to generate a changing magnetic field to induce the heating element 50 to be penetrated by the magnetic field and generate heat; the induction coil 40 is wound or arranged outside the tubular support 30, and is then supported and fixed by the tubular support 30. The tubular support 30 is made of a non-sensitive rigid heat-resistant material such as PEEK, ceramic, etc. The material of the induction coil 40 is made of a relatively low resistivity excellent conductor metal material, such as gold, silver, copper, or alloys thereof. Of course, in some embodiments, the surface of the induction coil 40 is insulated by spraying an insulating layer or enameled wire.

[0092] In some embodiments, the frequency of the alternating current supplied from the circuit board 140 to the induction coil 40 is between 80KHz and 800KHz; more specifically, the frequency may be in the range of about 200KHz to 500KHz. In a most common implementation, the circuit board 140 generally includes a capacitor, and forms an LC resonant circuit with the induction coil 40 through the capacitor; and the circuit board 140 drives the LC resonant circuit to oscillate at the above predetermined frequency to form an alternating current flowing through the induction coil 32.

[0093] In one embodiment, the DC supply voltage provided by the battery cell 130 is in a range of about 2.5V to about 9.0V, and the ampere of the DC current provided by the battery cell 130 is in a range of about 2.5A to about 20A.

[0094] exist Figure 1 In the illustrated embodiment, the aerosol generating device 100 further comprises:

[0095] The support element 70 is used for the tubular support 30 and / or the heating element 50 to abut against, so as to at least partially support them. In addition, in practice, the support element 70 itself is held or fixed on the wall 151. See further Figure 1 As shown, the heating element 50 has a second end 520 close to the distal end 120 , and the second end 520 of the heating element 50 is against the support element 70 .

[0096] In some implementations, the heating element 50 is tubular in shape; the heating element 50 has a wall thickness of about 0.05-0.5 mm; and the heating element 50 has a length of about 20-50 mm; and the heating element 50 has an inner diameter of about 5.0-10.0 mm. The length of the aerosol-generating article 1000 surrounded or enclosed by the heating element 50 is greater than 30 mm.

[0097] In some other implementations, the induction coil 40 has a length approximately equal to that of the heating element 50; and, the length of the induction coil 40 may be slightly less than that of the heating element 50. Figure 1 to Figure 2In the embodiment, both ends of the heating element 50 in the length direction protrude or extend outside the induction coil 40, so that the magnetic field generated by the induction coil 40 can be completely located within the length range of the heating element 50, which is beneficial for reducing leakage magnetic field.

[0098] In an embodiment, the induction coil 40 is a solenoid coil; in some other implementations, the length of the induction coil 40 is 20 to 50 mm in length. And in some implementations, the induction coil 40 has about 6 to 30 turns.

[0099] according to Figure 2 As shown, the heating element 50 generates heat by being penetrated by a changing magnetic field, thereby heating the aerosol generating article 1000; the heating element 50 comprises:

[0100] A first end 510 and a second end 520 are separated from each other along the length direction; and the heating element 50 includes: a first section 51 and a second section 52; wherein the first section 51 is close to the first end 510, and the second section 52 is close to the second end 520.

[0101] according to Figure 2 and Figure 3 As shown, the heating element 50 is also provided with:

[0102] The temperature sensor 71 is located on the first section 51 to sense the temperature of the first section 51. The temperature sensor 71 may be a thermistor sensor or a thermocouple. In a specific implementation, the temperature sensor 71 includes a first thermocouple wire and a second thermocouple wire connected to the first section 51 by welding or the like, and they are made of different thermocouple materials, thereby forming a thermocouple therebetween that can be used to sense the temperature of the first section 51. In some embodiments, the temperature sensor 71 is located at the highest temperature position of the first section 51; for example Figure 3 The distance d1 between the junction position of the middle temperature sensor 71 and the first section 51 and the upper end of the heating element 50 is between 1 / 3 and 1 / 2 of the length of the first section 51 ; this position is the highest temperature position of the first section 51 .

[0103] The heating element 50 is also provided with:

[0104] The temperature sensor 72 is located on the second section 52 to sense the temperature of the second section 52. The temperature sensor 72 may be a thermistor sensor or a thermocouple. In a specific implementation, the temperature sensor 72 includes a third thermocouple wire and a fourth thermocouple wire connected to the second section 52 by welding or the like, and they are made of different thermocouple materials, thereby forming a thermocouple therebetween that can be used to sense the temperature of the second section 52.

[0105] according to Figure 2 and Figure 3 As shown, the induction coil 40 includes:

[0106] The first part 41 and the second part 42 are formed by winding or wrapping the same wire material. In the embodiment, the first part 41 is arranged around the first section 51 of the heating element 50; the second part 42 is arranged around the second section 52 of the heating element 50. Accordingly, the length of the first section 51 is substantially the same as or similar to the length of the first part 41 of the induction coil 40; and the length of the second section 52 is substantially the same as or similar to the length of the second section 42 of the induction coil 40.

[0107] exist Figure 3 In the illustrated embodiment, the number of turns per unit length of the first portion 41 and the second portion 42 is substantially constant; or in some other variant embodiments, the number of turns per unit length of the first portion 41 and / or the second portion 42 is variable or non-constant; for example, the number of turns per unit length of the first portion 41 and / or the second portion 42 gradually decreases. Also, the number of turns or the length of the first portion 41 and the second portion 42 are substantially similar; for example, Figure 3 In the illustrated embodiment, the number of turns of the first portion 41 and the second portion 42 are both 6 turns.

[0108] according to Figure 3 As shown, the induction coil 40 also includes a plurality of connection taps, which can be connected to the circuit board 140 respectively, so that the single induction coil 40 is divided into a plurality of coil parts by the plurality of connection taps; for example, Figure 2 As shown in the figure, the first connection tap 431, the second connection tap 432 and the third connection tap 433 are included. In the embodiment, the first part 41 is defined between the first connection tap 431 and the second connection tap 432, and the second part 42 is defined between the second connection tap 432 and the third connection tap 433. The induction coil 40 having the above multiple connection taps can selectively connect two of the connection taps to the circuit, so as to selectively make only one of the first part 41 and the second part 42 of the induction coil 40 generate a magnetic field individually or the whole part 41 and the second part 42 generate a magnetic field simultaneously.

[0109] Figure 4 A schematic diagram of a circuit on a circuit board 140 according to an embodiment is shown. Figure 4 As shown in , the circuit includes:

[0110] The LC oscillator is composed of an induction coil 40 and a capacitor; Figure 4 In the embodiment, the LC oscillator is a conventional symmetrical half-bridge LC oscillator; specifically, Figure 4The capacitor of the symmetrical half-bridge LC oscillator shown in the figure includes a capacitor C1 and a capacitor C2 connected in series; wherein the first end of the capacitor C1 is connected to the positive electrode of the battery cell 130, and the second end is connected to the first end of the capacitor C2; the second end of the capacitor C2 is connected to the negative electrode of the battery cell 130 through grounding; the second end of the capacitor C1 and the first end of the capacitor C2 are simultaneously connected to the second connection tap 432 of the induction coil 40;

[0111] The inverter 23, such as a half-bridge, is used to drive the LC oscillator to oscillate; Figure 4 In the embodiment, the inverter 23, for example, a half-bridge includes a switch tube Q3 and a switch tube Q4 connected in series; and the on and off of the switch tube Q3 and the switch tube Q4 are controlled by the drive level issued by the switch driver chip 22; and the drive level issued by the switch driver chip 22 is controlled by a PWM control signal modulated by the MCU controller. Or in some other common variant embodiments, the inverter 23 can also use a full bridge or H bridge or a class E power amplifier or an inverse class E power amplifier including four switch tubes.

[0112] exist Figure 4 In the embodiment shown, the circuit further comprises:

[0113] The first switch S1 is connected between the first connection tap 431 of the induction coil 40 and the switch tube Q3; Figure 4 In the connection mode, the first part 41 of the induction coil 40 is operably connected through the first switch S1 to form an LC oscillator;

[0114] The second switch S2 is connected between the third connection tap 433 of the induction coil 40 and the switch tube Q3; Figure 4 In the connection mode, the second part 42 of the induction coil 40 is operably connected through the second switch S2 to form an LC oscillator.

[0115] Figure 4 In the illustrated embodiment, the process of circuit control to generate oscillation may include:

[0116] The first switch S1 is turned on and the second switch S2 is turned off, so that only the first part 41 of the induction coil 40 is connected to the capacitors C1 and C2 to form an LC oscillator; then, oscillation is generated by controlling the switch tubes Q3 and Q4 to be alternately turned on and off, thereby forming an alternating current flowing through the first part 41 of the induction coil 40 to cause the first part 41 of the induction coil 40 to generate a changing magnetic field, so as to induce heating of the first section 51 of the heating element 50 alone.

[0117] Similarly, the circuit can also control the first switch S1 to be turned off and the second switch S2 to be turned on, so that only the second part 42 of the induction coil 40 is connected to the capacitor C1 and the capacitor C2 to form an LC oscillator, thereby controlling the oscillation to form an alternating current flowing through the second part 42 of the induction coil 40 so that the second part 42 generates a changing magnetic field, thereby inducing heating of the second section 52 of the heating element 50 alone.

[0118] Figure 4 In the embodiment shown, the process of circuit control to generate oscillation may also include:

[0119] The first switch S1 and the second switch S2 are turned on at the same time, so that the first part 41 and the second part 42 of the induction coil 40 are connected at the same time and form an LC oscillator, thereby controlling the first part 41 and the second part 42 of the induction coil 40 to simultaneously generate a changing magnetic field, so as to simultaneously induce heating of the first section 51 and the second section 52 of the heating element 50. And, when the first switch S1 and the second switch S2 are turned on at the same time, the first part 41 and the second part 42 of the induction coil 40 are connected in parallel and simultaneously generate magnetic fields.

[0120] In some embodiments, for example Figure 8 As shown, the process of circuit control to generate oscillation includes:

[0121] S100, in a first time period, the first switch S1 is turned on, the second switch S2 is turned off, and the first part 41 of the induction coil 40 is connected, and the first part 41 of the induction coil 40 is controlled to generate a changing magnetic field to induce heating of the first section 51 of the heating element 50 alone;

[0122] S200, in the second time period, the first switch S1 and the second switch S2 are turned on simultaneously, so that the first part 41 and the second part 42 of the induction coil 40 are simultaneously connected and form an LC oscillator, so as to simultaneously induce heating of the first section 51 and the second section 52 of the heating element 50.

[0123] During the heating process, it is beneficial to quickly heat the first section 51 of the heating element 50 in the first time stage, so as to quickly output the aerosol to the filter nozzle; and to completely heat the first section 51 and the second section 52 of the heating element 50 in the second time stage, which is beneficial to maintain a uniform amount or taste of the aerosol output.

[0124] In the heating process, the first time stage and the second time stage are separated. For example, in some embodiments, the first time stage and the second time stage are separated by 10 to 20 seconds; for example, after the first part 41 of the induction coil 40 is controlled to generate a changing magnetic field to induce heating of the first section 51 of the heating element 50 alone in the first time stage, the first part 41 and the second part 42 of the induction coil 40 are started again after an interval of 10 to 20 seconds to induce heating of the first section 51 and the second section 52 of the heating element 50 at the same time.

[0125] In the control process, when the first part 41 and the second part 42 of the induction coil 40 simultaneously generate magnetic fields for heating in the step S200 stage, the power of the second part 42 is correlated with the first part 41; the temperature change of the first section 51 of the heating element 50 is detected by the temperature sensor 71, and the energy outputted to the first section 51 by the first part 41 can be reversely determined; further, based on the correlation or relevance of the power of the second part 42 with the first part 41, the temperature change of the second section 52 of the heating element 50 can be further estimated. Therefore, in the process of step S200, the temperature of the second section 52 is estimated and determined by the sensing result of the temperature sensor 71; it is beneficial to omit or save the cost of the temperature sensor 72 arranged in the second section 52 in hardware.

[0126] Figure 5 A schematic diagram showing a circuit of another variant embodiment is shown. Figure 5 The circuit shown in the figure has only a capacitor C1 for forming an LC oscillator with the first part 41 and / or the second part 42 of the induction coil 40; Figure 5 In the embodiment shown, the LC oscillator having only the capacitor C1 is a commonly used asymmetric half-bridge LC oscillator. Figure 5 In the illustrated embodiment, the circuit can selectively turn on one or both of the first switch S1 and the second switch S2 to selectively drive one or both of the first portion 41 and the second portion 42 of the induction coil 40 to generate a magnetic field.

[0127] Specifically in Figure 5 As shown, when one of the first switch S1 and the second switch S2 is turned on, one of the first part 41 and the second part 42 can be connected in series with the capacitor C1 to form an LC oscillator; and when two of the first switch S1 and the second switch S2 are turned on, the first part 41 and the second part 42 are connected in parallel and then in series with the capacitor C1 to form an LC oscillator.

[0128] Figure 6 A schematic diagram of an induction coil 40a of another embodiment is shown. Figure 6 In the illustrated embodiment, the induction coil 40a comprises:

[0129] The first spiral coil 41a is substantially similar to the length of the heating element 50; the first spiral coil 41a comprises a first portion 411a and a second portion 412a arranged in sequence along the axial direction; wherein the first portion 411a surrounds the first section 51 of the heating element 50, and the second portion 412a surrounds the second section 52 of the heating element 50;

[0130] The second helical coil 42 a is arranged around the first section 51 of the heating element 50 and avoids the second section 52 of the heating element 50 .

[0131] The length of the first helical coil 41a is obviously greater than the length of the second helical coil 42a.

[0132] exist Figure 6 As shown in , the heating coil 40a also includes:

[0133] The first connection tap 431a, the second connection tap 432a and the third connection tap 433a; wherein the first spiral coil 41a is connected or arranged between the first connection tap 431a and the third connection tap 433a; the second spiral coil 42a is connected or arranged between the first connection tap 431a and the second connection tap 432a. Figure 6 As shown in FIG. 4 , one end of the first helical coil 41a and one end of the second helical coil 42a are simultaneously welded to the first connecting tap 431a, or one end of the first helical coil 41a and one end of the second helical coil 42a share the first connecting tap 431a.

[0134] In this Figure 6 In the embodiment, the first helical coil 41a and the second helical coil 42a are simultaneously and substantially uniformly wound outside the tubular stent 30; and the diameters or the number of turns per unit length of the first helical coil 41a and the second helical coil 42a are the same.

[0135] Accordingly, the circuit makes the first spiral coil 41a and the second spiral coil 42a form LC oscillators respectively, so as to guide the alternating current to flow through the first spiral coil 41a and the second spiral coil 42a as required. Fig. 9 As shown, it may include:

[0136] S100a, in a first time period, an alternating current is introduced to the second spiral coil 42a through the first connection tap 431a and the second connection tap 432a, so that only the second spiral coil 42a generates a magnetic field to induce eddy current heating in the first section 51 of the heating element 50 alone;

[0137] S200a, in the second time stage, an alternating current is guided to the first spiral coil 41a through the first connection tap 431a and the third connection tap 433a, so that the first spiral coil 41a generates a magnetic field to simultaneously induce eddy current heating in the first section 51 and the second section 52 of the heating element 50. Similarly, in this heating process, the first time stage and the second time stage are spaced apart; for example, in some embodiments, the first time stage and the second time stage are spaced apart by 10 to 20 seconds.

[0138] Before and after the switching of S100a and S200a in the above heating process, since the second spiral coil 42a and the first spiral coil 41a have different inductances, they have different resonant frequencies respectively; accordingly, in the embodiment, the circuit may include a first LC oscillator composed of the first spiral coil 41a and a capacitor, and a second LC oscillator composed of the second spiral coil 42a and a capacitor; and, since the second spiral coil 42a and the first spiral coil 41a have different inductances, the first LC oscillator and the second LC oscillator have different resonant frequencies. Accordingly, the circuit configuration is:

[0139] In the first time period, the second LC oscillator is driven to oscillate according to a preset first driving frequency, thereby forming an alternating current flowing through the second spiral coil 42a; and in the second time period, the first LC oscillator is driven to oscillate according to a preset second driving frequency, thereby forming an alternating current flowing through the first spiral coil 41a. The first driving frequency and the second driving frequency are different.

[0140] Or in some other variations, the circuit may have a resonant frequency detection module to track and monitor the current resonant frequency in the first time stage S100a and the second time stage S200a of the heating control process, and to feedback and adjust the output driving frequency based on the result of the real-time detection of the resonant frequency, so as to output the same driving frequency to drive the second LC oscillator to oscillate according to the detected resonant frequency of the second LC oscillator in the first time stage; and to output the same driving frequency to drive the first LC oscillator to oscillate according to the detected resonant frequency of the first LC oscillator in the second time stage.

[0141] or Figure 7In another variation, the first spiral coil 41b is independently supplied with alternating current through the first connection tap 431b and the second connection tap 432b welded at both ends to generate a magnetic field; and the second spiral coil 42b is supplied with alternating current through the third connection tap 433b and the fourth connection tap 434b welded at both ends to generate a magnetic field. In this embodiment, the second spiral coil 42b can be similarly made to induce the first section 51 of the heating element 50 to form eddy current heating in the first time stage, and the first spiral coil 41b can be made to generate a magnetic field in the second time stage, thereby simultaneously inducing the first section 51 and the second section 52 of the heating element 50 to form eddy current heating.

[0142] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application, but are not limited to the embodiments described in the specification. Furthermore, it is possible for a person of ordinary skill in the art to make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present application.

Claims

1. A method for controlling an aerosol generating device, characterized in that: The aerosol generating device comprises: an induction coil configured to generate a changing magnetic field to induce the receptive heating element to heat the aerosol generating article; the induction coil comprising at least a first portion and a second portion arranged in a longitudinal direction; capacitance; The method comprises: In a first time stage, the first part is connected to the capacitor to form an LC oscillator, so that the first part alone generates a changing magnetic field; In a second time period, the first part and the second part are connected to the capacitor at the same time to form an LC oscillator, so that the first part and the second part generate a changing magnetic field at the same time.

2. The control method of the aerosol generating device according to claim 1, characterized in that: There is an interval of 10s to 20s between the first time stage and the second time stage.

3. A method for controlling an aerosol generating device, characterized in that: The aerosol generating device comprises: an induction coil configured to generate a changing magnetic field to induce a receptive heating element to heat an aerosol-generating article; the heating element comprising a first section and a second section arranged in a longitudinal direction; and the induction coil comprising: a first helical coil including a first portion surrounding the first segment and a second portion surrounding the second segment; a second spiral coil surrounding the first section and avoiding the second section; The method comprises: In a first time period, directing an alternating current to flow through the second spiral coil so that the second spiral coil generates a changing magnetic field to induce heating of the first section; During a second time period, an alternating current is directed to flow through the first spiral coil so that the first portion and the second portion of the first spiral coil generate a changing magnetic field to induce heating of the first section and the second section simultaneously.

4. An aerosol generating device, configured to heat an aerosol generating article to generate an aerosol; characterized in that, include: an induction coil configured to generate a varying magnetic field to induce the receptive heating element to heat the aerosol-generating article; The induction coil comprises at least a first portion and a second portion arranged in the longitudinal direction; capacitance; The circuit is arranged to selectively connect one or both of the first part and the second part to the capacitor to form an LC oscillator, so that one of the first part and the second part generates a changing magnetic field alone or both of them generate a changing magnetic field simultaneously.

5. The aerosol generating device according to claim 4, characterized in that The induction coil includes a first connection tap, a second connection tap and a third connection tap which are arranged in sequence at different positions along the longitudinal direction, thereby dividing the single induction coil into the first part located between the first connection tap and the second connection tap, and the second part located between the second connection tap and the third connection tap.

6. The aerosol generating device according to claim 4 or 5, characterized in that: The circuit is arranged to form an LC oscillator by connecting one of the first part and the second part with the capacitor, thereby driving one of the first part and the second part to generate a changing magnetic field individually.

7. The aerosol generating device according to claim 4 or 5, characterized in that: The circuit is configured as: In a first time stage, the first part is connected to the capacitor to form an LC oscillator, so that the first part alone generates a changing magnetic field; In a second time period, the first part and the second part are connected to the capacitor at the same time to form an LC oscillator, so that the first part and the second part generate a changing magnetic field at the same time.

8. The aerosol generating device according to claim 4 or 5, characterized in that: The circuit comprises: a first switch configured to operably connect the first portion to the capacitor to form an LC oscillator; and A second switch is configured to operably connect the second portion to the capacitor to form an LC oscillator.

9. The aerosol generating device according to claim 5, characterized in that The circuit further comprises: The inverter is used to drive the LC oscillator to oscillate.

10. The aerosol generating device according to claim 9, characterized in that The second connection tap is connected to the capacitor; The first connection tap is connected to the inverter via a first switch; The third connection tap is connected to the inverter via a second switch.

11. An aerosol generating device, configured to heat an aerosol generating article to generate an aerosol; characterized in that: include: an induction coil configured to generate a varying magnetic field to induce the receptive heating element to heat the aerosol-generating article; The heating element comprises a first section and a second section arranged in a longitudinal direction; And, the induction coil comprises: a first helical coil including a first portion surrounding the first segment and a second portion surrounding the second segment; a second spiral coil surrounding the first section and avoiding the second section; The circuit is configured to selectively guide an alternating current to flow through one of the first spiral coil and the second spiral coil, thereby selectively causing the first spiral coil to generate a magnetic field to induce simultaneous heating of the first segment and the second segment of the heating element, or causing the second spiral coil to generate a magnetic field to induce heating of the first segment of the heating element.

12. An aerosol generating device, configured to heat an aerosol generating article to generate an aerosol; characterized in that: include: an induction coil configured to generate a varying magnetic field to induce a receptive heating element to heat the aerosol-generating article; the heating element comprising a first section and a second section arranged in a longitudinal direction; The circuit is configured as: In a first time period, the induction coil generates a magnetic field penetrating the first section, so that the first section is heated alone; In a second time period, the induction coil generates a magnetic field that penetrates the first section and the second section simultaneously, so that the first section and the second section are heated simultaneously.

13. The aerosol generating device according to claim 12, characterized in that The induction coil includes a first portion and a second portion arranged in a longitudinal direction; the first portion is arranged around the first section, and the second portion is arranged around the second section; The circuit is configured as: directing an alternating current only in the first portion during the first time period, so that only the first portion generates a magnetic field penetrating the first section; During the second time period, an alternating current is simultaneously conducted to the first portion and the second portion, so that the induction coil generates a magnetic field that simultaneously penetrates the first section and the second section.

14. The aerosol generating device according to claim 12, characterized in that The induction coil comprises: a first helical coil including a first portion surrounding the first segment and a second portion surrounding the second segment; a second spiral coil surrounding the first section and avoiding the second section; The circuit is configured as: During the first time period, an alternating current is guided only to the second spiral coil, so that only the second spiral coil generates a magnetic field penetrating the first section; During the second time period, an alternating current is conducted to the first spiral coil, so that the first spiral coil generates a magnetic field that penetrates both the first section and the second section.

15. The aerosol generating device according to claim 14, characterized in that The induction coil comprises: A first connection tap, a second connection tap and a third connection tap arranged in sequence at different positions in the longitudinal direction; The second helical coil is connected between the first connection tap and the second connection tap; The first helical coil is connected between the first connection tap and the third connection tap.

16. An induction coil for an aerosol generating device, characterized in that: include: A first connection tap, a second connection tap, and a third connection tap arranged at different positions in the longitudinal direction; A first spiral coil connected between the first connection tap and a third connection tap; The second spiral coil is connected between the first connection tap and the second connection tap.

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