Electronic atomization device and control method

Abstract

The invention provides an electronic atomization device and a control method. Wherein the electronic atomization device comprises: a susceptor for heating an aerosol-generating substrate to generate an aerosol; the LC oscillator comprises an induction coil and a capacitor, and is configured to guide changing current to flow through the induction coil so as to drive the susceptor to heat the aerosol-generating substrate; and the controller is configured to perform noise reduction filtering processing on the sampling signal based on the resonance voltage or the resonance current of the LC oscillator to obtain a filtering signal, and determine the insufficiency or exhaustion of the aerosol generating substrate on the susceptor according to the filtering signal. According to the electronic atomization device, noise reduction filtering processing is carried out on the sampling signal based on the resonance voltage or the resonance current of the LC oscillator to obtain the filtering signal, and dry burning of the receptor is determined; and the controller can accurately sample, analyze and identify the dry burning state more easily or accurately.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electronic atomization technology, and in particular, to an electronic atomization device and a control method. 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 compounds 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. As another example, there are aerosol providing products, such as so-called electronic atomization devices. These devices typically contain a liquid that is heated to vaporize it, thereby producing an inhalable aerosol. Known electronic atomization devices generate a changing magnetic field through an induction coil to induce a receptor to heat the liquid to generate an aerosol. In the operation of this type of electronic atomization device that induces heating and atomization, it is impossible to detect the temperature of the receptor by a non-contact temperature detection method to determine whether the liquid on the receptor is exhausted or insufficient, that is, whether it is in a "dry burn" state. Summary of the invention

[0004] An embodiment of the present application provides an electronic atomization device, comprising:

[0005] a susceptor for heating the aerosol-generating substrate to generate an aerosol;

[0006] An LC oscillator, comprising an induction coil and a capacitor; the LC oscillator is configured to guide a changing current to flow through the induction coil, thereby driving the induction coil to provide energy to the susceptor so that the susceptor heats the aerosol generating substrate;

[0007] The controller is configured to perform noise reduction filtering on a sampled signal based on the resonant voltage or resonant current of the LC oscillator to obtain a filtered signal, and determine the insufficiency or exhaustion of the aerosol generating substrate on the receptor according to the filtered signal.

[0008] In some embodiments, the sampling signal is obtained by sampling the resonant voltage or the resonant current of the LC oscillator.

[0009] In some embodiments, the sampling signal is obtained by sampling a shaped voltage or a shaped current after the resonant voltage or the resonant current of the LC oscillator is shaped.

[0010] In some embodiments, the controller is configured to determine that the aerosol generating substrate on the receptor is insufficient or exhausted when a signal value of the filtered signal exceeds a preset threshold.

[0011] In some embodiments, the controller is configured to determine that the aerosol generating substrate on the receptor is insufficient or exhausted when a difference between a signal value of the filtered signal and a reference value is greater than a preset threshold.

[0012] In some embodiments, the controller is configured to determine the deficiency or depletion of the aerosol generating substrate on the susceptor based on a time derivative of a signal value of the filtered signal or an amount of change in a signal value within a predetermined time.

[0013] In some embodiments, the noise reduction filtering process includes performing recursive prediction filtering on the sampled signal.

[0014] In some embodiments, the recursive prediction filtering includes recursively performing a prediction step and an update step; wherein,

[0015] The prediction step includes: obtaining the sampling value V of the sampling signal at the current moment n , and based on the mathematical model of linear Gaussian distribution according to the sampling value V n Predict the next time t n+1 The predicted value K n+1 ;

[0016] The updating step includes: obtaining the next time t n+1 The sampling value V of the sampling signal n+1 , and the sampled value V n+1 The linear Gaussian distribution with the predicted value K n+1 The linear Gaussian distributions of the two components are multiplied to obtain the overlapping part of their Gaussian distributions, and then a linear weighted operation is performed on the overlapping part of the Gaussian distributions.

[0017] In some embodiments, it also includes:

[0018] A shaping module, used for performing the shaping process on the resonant voltage or resonant current of the LC oscillator; the shaping module at least comprises:

[0019] The integration unit integrates and shapes the resonant voltage or resonant current of the LC oscillator.

[0020] In some embodiments, the integration unit includes a passive RC integration circuit, an active integration circuit, or an integration operation chip.

[0021] In some embodiments, the shaping module further comprises:

[0022] The first filter capacitor is connected in series between the LC oscillator and the integration unit to filter and shape the resonant voltage or resonant current of the LC oscillator and then provide it to the integration unit.

[0023] Another embodiment of the present application further provides an electronic atomization device, comprising:

[0024] a susceptor for heating the aerosol-generating substrate to generate an aerosol;

[0025] An LC oscillator, comprising an induction coil and a capacitor; the LC oscillator is configured to guide a changing current to flow through the induction coil, thereby driving the induction coil to provide energy to the susceptor so that the susceptor heats the aerosol generating substrate;

[0026] A first filter capacitor, connected to the LC oscillator, for filtering and shaping the resonant voltage or resonant current of the LC oscillator;

[0027] an integration unit, used for integrating and shaping the resonant voltage or resonant current of the LC oscillator after filtering and shaping by the first filter capacitor, so as to generate a shaped signal;

[0028] A controller is configured to determine deficiency or depletion of aerosol generating substrate on the susceptor based on the shaped signal output by the integrator.

[0029] Another embodiment of the present application further provides a control method for an electronic atomization device, the electronic atomization device comprising:

[0030] a susceptor for heating the aerosol-generating substrate to generate an aerosol;

[0031] An LC oscillator, comprising an induction coil and a capacitor; the LC oscillator is configured to guide a changing current to flow through the induction coil, thereby driving the induction coil to provide energy to the susceptor so that the susceptor heats the aerosol generating substrate;

[0032] The method comprises:

[0033] A sampling signal based on the resonant voltage or the resonant current of the LC oscillator is subjected to noise reduction filtering to obtain a filtered signal, and the deficiency or exhaustion of the aerosol generating substrate on the receptor is determined according to the filtered signal.

[0034] The above electronic atomization device obtains a filtered signal by performing noise reduction filtering on the sampling signal based on the resonant voltage or resonant current of the LC oscillator to determine the dry burning of the receptor; it is easier or more accurate for the controller to accurately sample, analyze and identify the dry burning state. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 is a schematic diagram of an electronic atomization device provided by an embodiment;

[0037] Figure 2 yes Figure 1 A structural block diagram of an embodiment of the circuit;

[0038] Figure 3 yes Figure 2 A schematic diagram of basic components of one embodiment of the circuit;

[0039] Figure 4 is a schematic diagram of a resonant voltage of an LC oscillator in one embodiment;

[0040] Figure 5 is a schematic diagram of sampling the voltage at the second end of the induction coil in one embodiment;

[0041] Figure 6 In one embodiment, Figure 4 Schematic diagram of the resonant voltage after filtering and shaping;

[0042] Figure 7 In one embodiment, Figure 6 A schematic diagram of a sampled signal obtained by sampling the output signal after filtering and shaping, and a filtered signal after performing noise reduction filtering on the sampled signal;

[0043] Figure 8 yes Figure 7 The schematic diagram of the filtered signal after the noise reduction filtering of the sampled signal is reduced by 50 times;

[0044] Fig. 9 is a schematic diagram of sampling the voltage at the second end of the induction coil in yet another embodiment;

[0045] Fig.10 Yes Fig. 9 Schematic diagram of the complete cycle of the resonant voltage corresponding to the voltage in the filter and shaping process;

[0046] Fig.11 Yes Fig.10 Schematic diagram of sampling the output signal after filtering and shaping to obtain the sampled signal and filtering the filtered signal after noise reduction filtering. DETAILED DESCRIPTION

[0047] 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.

[0048] One embodiment of the present application provides an electronic atomization device for atomizing an aerosol-generating substrate to generate an aerosol. In some embodiments, the electronic atomization device may include two or more parts that are separated or replaced from each other, which, when combined, form a complete combined use state of the electronic atomization device and can generate an aerosol in response to a user's operation.

[0049] In some embodiments, the electronic atomization device can generate an aerosol by heating a liquid aerosol generating substrate; in some embodiments, the liquid aerosol generating substrate includes at least one of propylene glycol, glycerin, and the like.

[0050] Or in some other embodiments, the electronic atomization device can form an aerosol for inhalation by heating a solid aerosol-generating substrate to volatilize or release at least one component of the solid aerosol-generating substrate. In some implementations, the solid aerosol-generating substrate preferably adopts a solid substrate, which can include one or more of powder, particles, fragments, strips, or flakes of one or more of herb leaves, dried flowers, herbal crops with volatile aroma, tobacco leaves, homogenized tobacco, and expanded tobacco; or, the solid substrate can contain additional tobacco or non-tobacco volatile aroma compounds to be released when the substrate is heated.

[0051] Figure 1 A schematic diagram of an electronic atomization device according to an embodiment is shown. In this embodiment, the electronic atomization device comprises: an atomizer 100 for atomizing a liquid aerosol to generate a substrate to generate an aerosol, and a power supply mechanism 200 for supplying power to the atomizer.

[0052] Further based on Figure 1 As shown, the power supply mechanism 200 includes:

[0053] The proximal end 2110 and the distal end 2120 are separated from each other in the longitudinal direction; in use, the proximal end 2110 is the end for receiving the nebulizer 100.

[0054] according to Figure 1 As shown, the power supply mechanism 200 also includes:

[0055] The receiving chamber 270 is arranged adjacent to the proximal end 2110 and is arranged along the longitudinal extension of the power supply mechanism 200; and the receiving chamber 270 has an opening along the longitudinal direction toward or located at the proximal end 2110; in use, the atomizer 100 can be received in the receiving chamber 270 through the opening, or removed from the receiving chamber 270.

[0056] according to Figure 1 As shown, the power supply mechanism 200 also includes:

[0057] A rechargeable battery cell 210 for outputting power; and the battery cell 210 is arranged near the distal end 2120;

[0058] The charging interface 240 is used to charge the rechargeable battery cell 210 ; and the charging interface 240 is arranged between the battery cell 210 and the distal end 2120 .

[0059] In one embodiment, the DC supply voltage provided by the battery cell 210 is in the range of about 2.5V to about 9.0V, and the amperage of the DC current provided by the battery cell 210 is in the range of about 2.5A to about 20A. In a specific embodiment, the DC supply voltage provided by the battery cell 210 is 3.2V to 4.2V.

[0060] according to Figure 1 As shown, the power supply mechanism 200 also includes:

[0061] The circuit 220 is integrated or arranged on a circuit board such as a PCB board, and is used to control the operation of the power supply mechanism 200, and in particular, the circuit 220 controls the power output by the battery cell 210. Figure 1 In the embodiment, the circuit 220 is located between the battery cell 210 and the receiving cavity 270 .

[0062] according to Figure 1 As shown, the power supply mechanism 200 also includes:

[0063] The airflow sensor 250, such as a microphone / MEMS sensor, is used to sense the airflow flowing through the atomizer 100 when the user draws air from the atomizer 100; and the circuit 220 controls the power output of the battery cell 210 according to the sensing result of the airflow sensor 250. Figure 1 In the illustrated embodiment, the airflow sensor 250 is arranged between the battery cell 210 and the receiving cavity 270. In some other embodiments, the airflow sensor 250 may also be assembled, fastened or combined on a circuit board on which the circuit 220 is arranged. Or in some other embodiments, the airflow sensor 250 is supported and fixed in the power supply mechanism 200 by an independent supporting element such as a plastic bracket.

[0064] In some embodiments, the power supply mechanism 200 induces the nebulizer 100 to heat the atomized liquid aerosol generating substrate by generating a changing magnetic field passing through the receiving cavity 270; specifically, an induction heating element may be arranged in the nebulizer 100, and when the nebulizer 100 is received in the receiving cavity 270, the changing magnetic field can penetrate and generate heat to heat the liquid aerosol generating substrate to generate an aerosol.

[0065] according to Figure 1 As shown, the power supply mechanism 200 also includes:

[0066] The induction coil 260 is arranged around the receiving cavity 270;

[0067] The circuit 220 drives the induction coil 260 at a predetermined frequency to generate an alternating current, thereby causing the induction coil 260 to generate a changing magnetic field that can penetrate the receiving cavity 270. In some embodiments, the frequency of the alternating current supplied by the circuit 220 to the induction coil 260 is between 80 KHz and 2000 KHz; more specifically, the frequency may be in the range of about 600 KHz to 1500 KHz.

[0068] And in some embodiments, the induction coil 260 is wound with a wire material with low resistivity, such as copper wire, silver wire, etc. And in some other embodiments, the induction coil 260 is wound with a Litz wire; Litz wire with multiple strands or multiple bundles of wires is more advantageous for carrying alternating current.

[0069] Figure 1 A schematic diagram of an atomizer 100 according to an embodiment is shown, and the atomizer 100 according to the embodiment comprises:

[0070] main housing 10;

[0071] The partition wall 11 extends in the main housing 10 along the longitudinal direction of the atomizer 100; and the partition wall 11 and the main housing 10 are integrally molded, for example, molded from a polymer, ceramic or other material; and the partition wall 11 extends to or terminates at the air outlet 111. And a liquid storage chamber 12 is defined between the partition wall 11 and the main housing 10 for storing a liquid aerosol generating matrix. And, the partition wall 11 surrounds and defines an aerosol output channel located in the main housing 10 for outputting the aerosol to the air outlet 111 during inhalation.

[0072] The atomizer 100 further comprises:

[0073] Atomizing assembly, used for atomizing a liquid aerosol-generating matrix to generate an aerosol; Figure 1 In the atomization assembly, the atomization assembly includes:

[0074] The susceptor 30 is used to heat the liquid aerosol-generating substrate to generate an aerosol;

[0075] The liquid-conducting element 20 is used to transfer the liquid aerosol-generating substrate between the liquid storage chamber 12 and the receptor 30 ; the liquid-conducting element 20 absorbs the liquid aerosol-generating substrate and transfers or provides it to the receptor 30 to heat it and generate an aerosol.

[0076] exist Figure 1In the illustrated embodiment, the liquid-conducting element 20 is configured to be located within the partition wall 11; and the liquid-conducting element 20 is configured to be a hollow cylinder extending in the longitudinal direction. In some embodiments, the liquid-conducting element 20 is made of a capillary material or a porous material, such as a sponge, cotton fiber, or a porous body such as a porous ceramic body. The outer surface of the liquid-conducting element 20 is configured as a liquid-absorbing surface for absorbing a liquid aerosol-generating matrix from the liquid storage chamber 12; in some specific embodiments, the partition wall 11 is provided with a plurality of perforations, and the outer surface of the liquid-conducting element 20 absorbs the liquid aerosol-generating matrix in the liquid storage chamber 12 through the perforations. The inner surface of the liquid-conducting element 20 is configured as an atomizing surface; the receptor 30 is combined with the inner surface of the liquid-conducting element 20 to heat at least part of the liquid aerosol-generating matrix in the liquid-conducting element 20 to generate an aerosol.

[0077] In some other embodiments, the liquid-conducting element 20 may also be configured to have various regular or irregular shapes, and partially be in fluid communication with the liquid storage chamber 12 to receive the liquid aerosol-generating substrate. Alternatively, in other variations, the liquid-conducting element 20 may have more regular or irregular shapes, such as a polygonal block, a groove shape with grooves on the surface, or an arch shape with a hollow channel inside.

[0078] Or in some other variations, the susceptor 30 may be combined with the liquid-conducting element 20 by printing, deposition, sintering or physical assembly. In some other variations, the liquid-conducting element 20 may have a plane or a curved surface for supporting the susceptor 30, and the susceptor 30 is formed on the plane or the curved surface of the liquid-conducting element 20 of the porous body by mounting, printing, deposition or the like.

[0079] exist Figure 1 In the illustrated embodiment, the susceptor 30 is an induction heating element that can be penetrated by a changing magnetic field and generate heat. The susceptor 30 is made of a metal or alloy having sensitivity. For example, the susceptor 30 can be made of grade 430 stainless steel (SS430), and can also be made of grade 420 stainless steel (SS420), and alloy materials containing iron and nickel (such as Permalloy). And in some specific embodiments, the susceptor 30 has a length of 2 mm to 10 mm; and the susceptor 30 has an inner diameter of 1.5 mm to 8 mm; and the partition wall thickness of the susceptor 30 is between 0.05 mm and 0.2 mm. For example, in some specific embodiments, the susceptor 30 has a length of 4 mm to 8 mm. According to Figure 1 As shown, the susceptor 30 is in the shape of a tube which is closed in the circumferential direction; and the susceptor 30 is a mesh structure having a plurality of holes arranged in an array for releasing aerosol.

[0080] Or in some other variations, the sensor 30 may be configured in a solenoid shape, or a more cylindrical shape.

[0081] exist Figure 1 In the illustrated embodiment, the induction coil 260 has an extension length of 6 to 15 mm; and the induction coil 260 has approximately 6 to 12 turns; the length of the susceptor 30 is less than the length of the induction coil 260; and when the atomizer 100 is received in the receiving chamber 270, the susceptor 30 is substantially completely located within the induction coil 260.

[0082] Figure 2 FIG. 2 is a schematic diagram of a circuit 220 in one embodiment. In the embodiment, the circuit 220 includes:

[0083] LC oscillator 222, formed by connecting an induction coil 260 to a capacitor;

[0084] The bridge 223 is connected between the LC oscillator 222 and the battery cell 210 to drive the LC oscillator 222 to oscillate, thereby forming an alternating current flowing through the induction coil 260 .

[0085] Figure 3 A schematic diagram of the basic components of a circuit 220 of a specific embodiment is shown. Figure 3 The LC oscillator 222 is an LC oscillator having two symmetrical bridge arms; Figure 3 In the embodiment, the LC oscillator 222 comprises:

[0086] Capacitors C1 and C2 are connected in series; wherein the first end of capacitor C1 is connected to the positive electrode of battery cell 210, and the second end is connected to the first end of capacitor C2; the second end of capacitor C2 is connected to the negative electrode of battery cell 210 via grounding; the second end of capacitor C1 and the first end of capacitor C2 are simultaneously connected to the second end of induction coil 260.

[0087] exist Figure 3 In the embodiment, bridge 223 is a half bridge matched to a symmetrical LC oscillator 222; Figure 3 In the embodiment, the bridge 223, for example a half bridge, includes a switch tube Q1 and a switch tube Q2 connected in series; Figure 3 In the connection, the first end of the switch tube Q1 is connected to the positive electrode of the battery cell 210, and the second end is connected to the first end of the induction coil 260; the first end of the switch tube Q2 is connected to the first end of the induction coil 260, and the second end is connected to the negative electrode of the battery cell 210 through grounding. And, the on and off of the switch tubes Q1 and Q2 are controlled by the PWM control signal modulated by the MCU controller 224. Or in some other common variations, the bridge 223 can also use a full bridge or H bridge including four switch tubes.

[0088] exist Figure 3 In the embodiment, the MCU controller 224 drives the LC oscillator 222 to oscillate by controlling the switch tube Q1 and the switch tube Q2 to be alternately turned on and off, thereby forming an alternating current flowing through the induction coil 260, so that the induction coil 260 generates a changing magnetic field to induce the receptor 30 to heat and generate aerosol.

[0089] Or in some other variations, the LC oscillator 222 may also be an asymmetric half-bridge LC oscillator 222 consisting of only one capacitor C2 connected in series with the induction coil 260 , and only having one oscillation bridge arm consisting of the capacitor C2 and the induction coil 260 connected in series.

[0090] In some embodiments, when the airflow sensor 250 senses the user's inhalation, the MCU controller 224 modulates the PWM control signal to turn on and off the switch tubes Q1 and Q2 alternately, thereby driving the LC oscillator 222 to oscillate so that the induction coil 260 generates a changing magnetic field.

[0091] In some embodiments, the MCU controller 224 controls the supply of energy to the susceptor 30 in a constant power mode so that the susceptor 30 is heated. Specifically, in an embodiment, the MCU controller 224 is configured to control the energy or power output by the battery cell 210 to the LC oscillator 222 based on a predetermined energy in a unit time, so that the energy value provided to the susceptor 30 in a unit time is maintained at a preset energy value. For example, in some specific embodiments, the energy value provided to the susceptor 30 in a unit time is 11.666667 J / s to heat the susceptor 30. Further, the MCU controller 224 controls and adjusts the duty cycle and / or frequency of the PWM control signal, so that the energy value provided to the susceptor 30 in a unit time is maintained at a preset energy value.

[0092] according to Figure 2 and Figure 3 As shown, the circuit 220 further includes:

[0093] The shaping module 221 is used to shape the resonant voltage of the LC oscillator 222 so that the MCU controller 224 can sample and monitor the resonant voltage of the LC oscillator 222 .

[0094] Specifically according to Figure 3 As shown in , the shaping module 221 includes a filtering voltage dividing unit 2211 and an integrating unit 2212. Wherein:

[0095] The filtering voltage division unit 2211 is connected to the second end of the induction coil 260 to filter and divide the resonant voltage of the LC oscillator 222. Specifically, the filtering voltage division unit 2211 includes a filter capacitor C3, a voltage division resistor R1 and a voltage division resistor R2 connected in series, and a filter capacitor C4 connected in parallel; Figure 3 In the example, the resonant voltage of the LC oscillator 222 is filtered by the series-connected filter capacitor C3, divided and amplified by the voltage-dividing resistors R1 and R2, and then filtered by the filter capacitor C4 before output. The voltage-dividing resistors R1 and R2 mainly reduce the voltage value of about 30 to 50 volts to a range of about 0.05 to 5 volts to prevent the signal strength from exceeding the sampleable range of the conventional I / O interface and failing to be sampled or burning the I / O interface.

[0096] The integration unit 2212 is used to integrate and shape the output signal of the filtering and voltage dividing unit 2211; Figure 3 As shown in , the integration unit 2212 is a common passive RC integration circuit, including a capacitor C5, a resistor R3 and a resistor R4. In some other embodiments, the integration unit 2212 can also use a common active integration circuit or an integration operation chip. The voltage shaping signal Vout output after shaping by the integration unit 2212 is the integral of the output voltage of the filtering voltage divider unit 2211 over time.

[0097] exist Figure 3 In order to prevent the voltage of the integration unit 2212 from being reversely output to the filtering voltage divider unit 2211, a diode D1 is further arranged between the output end of the filtering voltage divider unit 2211 and the input end of the integration unit 2212 to provide a unidirectional output.

[0098] Figure 4 The waveform of the resonant voltage of the LC oscillator 222 is shown when the liquid aerosol generating substrate on the susceptor 30 is sufficient during the heating process; the resonant voltage of the LC oscillator 222 is a sine waveform. When the liquid aerosol generating substrate is sufficient, the amplitude of the resonant voltage of the LC oscillator 222 is V1.

[0099] Figure 5 The voltage waveform of the second end of the induction coil 260 that is only sampled and acquired is shown; since the shaping module 221 is only connected to the second end of the induction coil 260 during use, only the waveform of the resonant voltage of the LC oscillator 222 in half a cycle can be acquired. Of course, the technician can also acquire the waveform of the other half cycle of the resonant voltage of the LC oscillator 222 through the first end of the induction coil 260. And, the amplitude of the voltage at the second end of the induction coil 260 of the half cycle waveform is also V2.

[0100] Figure 6 Schematic diagram showing the voltage waveform of the resonant voltage of the LC oscillator 222 in half a cycle, after being filtered and shaped by the shaping module 221, and outputting the voltage shaping signal Vout; Figure 6As shown, after filtering, voltage division, and integration shaping by the shaping module 221, the voltage shaping signal Vout has the same period as the resonant voltage of the LC oscillator 222; and the amplitude V1a of the voltage shaping signal Vout output after shaping is related to the resonant voltage amplitude V1 of the LC oscillator 222. Then, the MCU controller 224 can monitor or determine the resonant voltage of the LC oscillator 222 by sampling the voltage shaping signal Vout output by the shaping module 221.

[0101] The signal value of the voltage shaped signal Vout of the resonant voltage shaped by the shaping module 221 is between about 0.05V and 5V, which is advantageous for the I / O interface of the MCU controller 224 to be able to sample and acquire. Compared with the original resonant voltage of up to 30V to 50V directly sampled by the I / O interface of the MCU controller 224, the signal value of the voltage shaped signal Vout after sampling and shaping will not burn the I / O interface or the MCU controller 224 due to excessive voltage. At the same time, the voltage shaped signal Vout of the resonant voltage after shaping is more suitable for sampling analysis and comparative calculation.

[0102] For example Figure 7 FIG. 2 shows the connection of the sampling signal Vout obtained by the MCU controller 224 sampling the voltage shaping signal Vout at a sampling frequency of 6 ms / time, and the sampling signal Vout displayed on the oscilloscope. 采样 Schematic diagram of Figure 7 The oscilloscope shown shows the sampled signal V 采样 It can be seen that the sampling signal obtained by the MCU controller 224 sampling the voltage shaping signal Vout at a sampling frequency of 6 ms / time jumps relatively discretely.

[0103] To eliminate sampling errors and background noise during the sampling process of the MCU controller 224, the MCU controller 224 is configured to sample the signal V 采样 Perform filtering; further Figure 7 The filtered signal V generated after filtering is shown in 滤波 Schematic diagram; for the sampling signal V 采样 The filtered signal V generated after filtering to eliminate or reduce background noise 滤波 It is relatively stable, which is beneficial for the MCU controller 224 to accurately monitor the resonant voltage of the LC oscillator 222.

[0104] In some embodiments, the MCU controller 224 performs filtering on the sampled signal Vsample to eliminate or reduce background noise, and uses a recursive prediction filtering algorithm to perform noise reduction filtering on the sampled signal Vsample. The noise reduction filtering process using the recursive prediction filtering algorithm includes both signal filtering and prediction of the next moment; in some specific embodiments, the noise reduction filtering using the recursive prediction filtering algorithm includes continuously and recursively performing the following steps:

[0105] S100, prediction step: get the current time t n The sampling signal V 采样 The sample value V n , and based on the mathematical model system of linear Gaussian distribution, the current moment t n The sample value V n Predict the next time t n+1 The predicted value K n+1 ;

[0106] S200, update step: obtain the next time t n+1 The sampling signal V 采样 The sample value V n+1 , and the sample value V n+1 The predicted value K predicted in step S100 n+1 Perform data fusion operation and obtain the operation result as V 滤波 Output; in actual calculation, data fusion operation is a linear weighted operation.

[0107] Specifically, in step S200, the sampling value V n+1 The predicted value K made in step S100 n+1 Data fusion is based on the mathematical model system of linear Gaussian distribution. The linear Gaussian distribution of the two is multiplied to obtain the overlapping part of their Gaussian distribution, and the overlapping part of their Gaussian distribution is linearly weighted. The result of the operation is V 滤波 .

[0108] The basic principle of the above recursive predictive filtering algorithm is to use multiple uncertain variables that can express the required target true value to a certain extent, such as the above sampling signal value and predicted signal value, to perform data fusion, and finally obtain data with high certainty and more accurate prediction that is considered to be closest to the true value.

[0109] Alternatively, in some other variant embodiments, the MCU controller 224 can directly sample the resonant voltage of the LC oscillator 222 to form a sampling signal, and the sampling signal can be subjected to noise reduction filtering by the above recursive prediction filtering algorithm to obtain a filtering signal V 滤波 .

[0110] Will Figure 7The filtered signal V after the noise reduction filtering is performed to eliminate the background noise 滤波 The waveform curve after further zooming out 50 times on the oscilloscope is as follows Figure 8 shown in; according to Figure 8 As shown in FIG. 1 , the filter signal V after the resonant voltage of the LC oscillator 222 is subjected to integral shaping and noise reduction filtering in normal operation is 滤波 It is basically a stable signal with very small fluctuations.

[0111] Fig. 9 FIG. 2 is a schematic diagram showing the voltage at the second end of the sampling induction coil 260 when the liquid aerosol generating substrate provided to the susceptor 30 is insufficient or exhausted in another embodiment. Fig. 9 As shown in the sampling results, when the liquid aerosol generating substrate on the sensor 30 is insufficient or exhausted at time t1, the equivalent impedance and equivalent inductance of the LC oscillator 222 in the circuit 220 will change significantly, so that the resonant voltage of the LC oscillator 222 has Fig. 9 Waveform S2 in .

[0112] according to Fig. 9 As shown, when the receptor 30 is in a dry burning state where the liquid aerosol generating substrate is insufficient or exhausted, the waveform S2 of the resonant voltage of the LC oscillator 222 has a voltage amplitude that is significantly reduced compared to the waveform S1 of the normal atomization state where the liquid aerosol generating substrate is sufficient; for example Fig. 9 The amplitude V2 of the resonance voltage in the dry-burning state is lower than the amplitude V1 of the normal working state. In addition, the waveform S2 of the resonance voltage is not a relatively standard sine waveform, but presents a more pointed shape.

[0113] Fig.10 Schematic diagram showing the voltage shaping signal Vout of the resonant voltage of the LC oscillator 222 after the resonant voltage of the resonant voltage is shaped by the shaping module 221 when the resonant voltage of the LC oscillator 222 of the susceptor 30 appears dry burning in the heated liquid aerosol generating matrix; Fig.10 It can be seen from the figure that when the susceptor 30 is dry-burned, the voltage shaping signal Vout of the resonant voltage after integration shaping has a voltage drop fluctuation interval S2a; and the voltage drop fluctuation interval S2b is caused by the change of the resonant voltage of the LC oscillator 222 in the dry-burning state. Fig.10 As shown, in the dry burning state of the susceptor 30, the minimum voltage value V3a of the interval S2a of the voltage shaping signal Vout of the integrally shaped resonant voltage is further smaller than the minimum voltage value V2a of the normal atomization state.

[0114] Fig.11The filter signal V is shown after the resonant voltage of the LC oscillator 222 of the susceptor 30 is shaped and filtered when the susceptor 30 is in a dry-burning state in the heated liquid aerosol generating matrix. 滤波 Schematic diagram of Fig.11 As shown in the figure, in the relatively stable filtered signal V 滤波 The voltage drops significantly in the interval S2b; and the voltage drops significantly in the interval S2b is caused by the change of the resonant voltage of the LC oscillator 222 in the dry-burning state. Fig.11 As shown in the figure, the filtered signal V in the dry burning state 滤波 The section S2b has a voltage change ΔV compared to the normal state.

[0115] based on Figure 8 and Fig.11 Filter signal V in normal atomization state and dry burning state 滤波 The MCU controller 224 is configured to monitor the filter signal V 滤波 The voltage change of the voltage can determine the shortage or exhaustion of the liquid aerosol generating substrate on the susceptor 30. And, the MCU controller 224 is configured to prevent the susceptor 30 from continuing to provide energy when it is determined that the liquid aerosol generating substrate on the susceptor 30 is insufficient or exhausted.

[0116] according to Fig.11 As shown, by analyzing the filtered resonant voltage filter signal V 滤波 It is easier or more accurate for the MCU controller 224 to sample, analyze and identify the change in the resonant voltage caused by the dry-burning state.

[0117] Specifically, in one embodiment, the MCU controller 224 is configured to monitor the filtered signal V 滤波 When the signal value exceeds the preset threshold, it is determined that the liquid aerosol generating substrate on the receptor 30 is insufficient or exhausted. In this embodiment, the preset threshold can refer to Fig.11 The preset threshold Vb2 shown in FIG. is selected; when the filtered signal V 滤波 When the signal value is lower than the preset threshold value Vb2, for example Fig.11 When the value Vb2 drops below the preset threshold value Vb2, it indicates that the liquid aerosol generating substrate provided to the receptor 30 is insufficient or exhausted.

[0118] Or in some more preferred embodiments, the MCU controller 224 can also 滤波 The signal value of determines the dry burning degree of the sensor 30. Fig.11 As shown in 滤波When the signal value exceeds the first preset threshold value, for example, the preset threshold value Vb2, and does not exceed the preset threshold value Vb3, it indicates that the sensor 30 is in a slight dry burning state; and when the monitoring filter signal V 滤波 When the signal value exceeds the preset threshold value Vb3, it indicates that the sensor 30 is in a severe dry-burning state.

[0119] Or specifically in another embodiment, the MCU controller 224 is configured to monitor the filtered signal V 滤波 When the difference between the signal value and the reference value exceeds a preset threshold, it is determined that the liquid aerosol generating substrate on the receptor 30 is insufficient or exhausted. Fig.11 In the filter signal V 滤波 The relatively stable voltage value Vb1 is used as the reference value. When the filtered signal V 滤波 When the difference between the voltage value Vb1 and the voltage value Vb1, that is, the change ΔV, exceeds a preset threshold, it indicates that the liquid aerosol generating substrate provided to the receptor 30 is insufficient or exhausted.

[0120] Or specifically in another embodiment, the MCU controller 224 is configured to monitor the filtered signal V 滤波 When the rate of change of the signal value of the predetermined time is greater than a preset threshold, it is determined that the liquid aerosol generating substrate on the receptor 30 is insufficient or exhausted. The rate of change of the predetermined time can be used to characterize the filtered signal V 滤波 The derivative or change slope of the signal value with respect to time is used to measure whether the ratio of the change ΔV to time exceeds a preset threshold.

[0121] Or in some other embodiments, the MCU controller 224 detects Fig.10 , to determine the insufficiency or exhaustion of the liquid aerosol generating substrate on the susceptor 30. Similarly, the MCU controller 224 can also determine the insufficiency or exhaustion of the liquid aerosol generating substrate on the susceptor 30 according to the signal value of the voltage shaping signal Vout exceeding a preset threshold, or the derivative of the voltage shaping signal Vout with respect to time exceeding a preset threshold, or the change amount of the voltage shaping signal Vout within a predetermined time exceeding a preset threshold, or the difference between the signal value of the voltage shaping signal Vout and the reference value exceeding a preset threshold.

[0122] In some other embodiments, the resonant current of the LC oscillator 222 is related to the resonant voltage; based on electrical knowledge, the resonant current of the LC oscillator 222 and the resonant voltage have a phase difference of 1 / 4 cycle and have the same sinusoidal waveform. In some other embodiments, the MCU controller 224 is configured to determine the insufficiency or exhaustion of the liquid aerosol generating substrate on the susceptor 30 by shaping and sampling the resonant current of the LC oscillator 222 and performing analysis or calculation similar to the above resonant voltage.

[0123] 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. An electronic atomization device, characterized in that: include: a susceptor for heating the aerosol-generating substrate to generate an aerosol; An LC oscillator, comprising an induction coil and a capacitor; the LC oscillator is configured to guide a changing current to flow through the induction coil, thereby driving the induction coil to provide energy to the susceptor so that the susceptor heats the aerosol generating substrate; The controller is configured to perform noise reduction filtering on a sampled signal based on the resonant voltage or resonant current of the LC oscillator to obtain a filtered signal, and determine the insufficiency or exhaustion of the aerosol generating substrate on the receptor according to the filtered signal.

2. The electronic atomization device according to claim 1, characterized in that: The sampling signal is obtained by sampling the resonant voltage or resonant current of the LC oscillator.

3. The electronic atomization device according to claim 1, characterized in that: The sampling signal is obtained by sampling the shaped voltage or shaped current after the resonant voltage or resonant current of the LC oscillator is shaped.

4. The electronic atomization device according to any one of claims 1 to 3, characterized in that: The controller is configured to determine the insufficiency or exhaustion of the aerosol generating substrate on the receptor when a signal value of the filtered signal exceeds a preset threshold.

5. The electronic atomization device according to any one of claims 1 to 3, characterized in that: The controller is configured to determine that the aerosol generating substrate on the receptor is insufficient or exhausted when a difference between a signal value of the filtered signal and a reference value is greater than a preset threshold.

6. The electronic atomization device according to any one of claims 1 to 3, characterized in that: The controller is configured to determine the deficiency or depletion of the aerosol generating substrate on the susceptor based on a time derivative of a signal value of the filtered signal or an amount of change in the signal value within a predetermined time.

7. The electronic atomization device according to any one of claims 1 to 3, characterized in that: The noise reduction filtering process includes performing recursive prediction filtering on the sampled signal.

8. The electronic atomization device according to claim 7, characterized in that: The recursive prediction filtering includes recursively performing a prediction step and an update step; wherein, The prediction step includes: obtaining the current time t n The sampling value V of the sampling signal n , and based on the mathematical model of linear Gaussian distribution according to the sampling value V n Predict the next time t n+1 The predicted value K n+1 ; The updating step includes: obtaining the next time t n+1 The sampling value V of the sampling signal n+1 , and the sampled value V n+1 The linear Gaussian distribution with the predicted value K n+1 The linear Gaussian distributions of the two components are multiplied to obtain the overlapping part of their Gaussian distributions, and then a linear weighted operation is performed on the overlapping part.

9. The electronic atomization device according to claim 3, characterized in that: Also includes: A shaping module, used for performing the shaping process on the resonant voltage or resonant current of the LC oscillator; The shaping module at least includes: The integration unit integrates and shapes the resonant voltage or resonant current of the LC oscillator.

10. The electronic atomization device according to claim 9, characterized in that: The integration unit includes a passive RC integration circuit, an active integration circuit or an integration operation chip.

11. The electronic atomization device according to claim 9, characterized in that: The shaping module also includes: The first filter capacitor is connected in series between the LC oscillator and the integration unit to filter and shape the resonant voltage or resonant current of the LC oscillator and then provide it to the integration unit.

12. An electronic atomization device, characterized in that: include: a susceptor for heating the aerosol-generating substrate to generate an aerosol; An LC oscillator, comprising an induction coil and a capacitor; the LC oscillator is configured to guide a changing current to flow through the induction coil, thereby driving the induction coil to provide energy to the susceptor so that the susceptor heats the aerosol generating substrate; A first filter capacitor, connected to the LC oscillator, for filtering and shaping the resonant voltage or resonant current of the LC oscillator; an integration unit, used for integrating and shaping the resonant voltage or resonant current of the LC oscillator after filtering and shaping by the first filter capacitor, so as to generate a shaped signal; A controller is configured to determine deficiency or depletion of aerosol generating substrate on the susceptor based on the shaped signal output by the integrator.

13. A control method for an electronic atomization device, the electronic atomization device comprising: a susceptor for heating the aerosol-generating substrate to generate an aerosol; LC oscillator, including an induction coil and a capacitor; The LC oscillator is configured to guide a changing current to flow through the induction coil, thereby driving the induction coil to provide energy to the susceptor so that the susceptor heats the aerosol generating substrate; Characterized in that the method comprises: A sampling signal based on the resonant voltage or the resonant current of the LC oscillator is subjected to noise reduction filtering to obtain a filtered signal, and the deficiency or exhaustion of the aerosol generating substrate on the receptor is determined according to the filtered signal.

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