Aerosol generating device and method for controlling the same

Abstract

The present application provides an aerosol generating device configured to heat an aerosol-generating product to generate a smoking aerosol, the aerosol generating device including: a susceptor configured to be penetrated by a varying magnetic field to generate heat and heat the aerosol-generating product; a series LC oscillator or series LCC oscillator having an induction coil configured to direct a varying current through the induction coil to drive the induction coil to generate the varying magnetic field; and a circuit configured to determine an oscillation frequency of the series LC oscillator or series LCC oscillator based on a rate of oscillation voltage regulation of the series LC oscillator or series LCC oscillator. The aerosol generating device determines the oscillation frequency based on the rate of oscillation voltage regulation.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent with application number 202011442673.4, titled "Aerosol generating device and control method," filed with the China Patent Office on December 8, 2020, the entire contents of which are incorporated herein by reference.

[0002] The embodiments of the present application relate to the technical field of heating and non-combustion type low-temperature smoking devices, and in particular to an aerosol generating device and a control method thereof. [Background technology]

[0003] Tobacco products (e.g., cigarettes, cigars, etc.) burn tobacco to produce tobacco smoke during use. As an alternative to these combusted tobacco products, efforts have been made to produce products that release compounds without combustion.

[0004] One example of such a product is a heating device, which releases compounds by heating a material rather than burning it. For example, the material may be tobacco or other non-tobacco products, which may or may not contain nicotine. In the known device, a heater that generates heat by electromagnetic induction heats the tobacco product to generate a smoking aerosol. In one prior art embodiment of the above heating device, Patent No. 201580007754.2 proposes an induction heating device that heats a special cigarette product by electromagnetic induction, specifically, an induction coil and a capacitor are connected in series or in parallel to form an LC oscillation to form an alternating current, which generates an alternating magnetic field in the coil to induce the susceptor to heat up and heat the cigarette product. In the above known heating device, an operational amplifier is usually used to synchronously output the oscillation voltage of the LC oscillation or a zero-cross comparator is used to detect the zero-cross time of the oscillation voltage, and then a control chip samples the result to calculate the frequency of the LC oscillation. In practice, the frequency of LC oscillation is very high, about 200-400KHz, so the control chip is required to sample the results of the comparator and amplifier when they are instantaneously output. In order not to miss the result signal instantaneously output by the comparator or amplifier, the control chip needs a sampling speed of about several tens of MHz, so it is not desirable to track the frequency of LC oscillation in this manner. Summary of the Invention

[0005] An embodiment of the present application is an aerosol generating device configured to heat an aerosol generating product to generate a smoking aerosol, comprising: a susceptor configured to be penetrated by a varying magnetic field and generate heat to heat the aerosol-generating product; a series LC or series LCC oscillator having an induction coil, the series LC or series LCC oscillator being configured to direct a varying current through the induction coil to drive the induction coil to generate a varying magnetic field; and a circuit configured to determine an oscillation frequency of the series LC oscillator or series LCC oscillator based on an oscillation voltage regulation rate of the series LC oscillator or series LCC oscillator. The aerosol generating device determines the oscillation frequency based on the oscillation voltage regulation rate.

[0006] In a preferred embodiment, the circuit comprises: an active differentiation unit configured to detect an oscillation voltage regulation rate of the series LC oscillator or the series LCC oscillator, and to output a high level signal when the oscillation voltage regulation rate is greater than a predetermined threshold; and a controller configured to determine an oscillation frequency of the series LC oscillator or series LCC oscillator based on an interval time of the high level signal.

[0007] In a preferred embodiment, the active differentiation unit comprises an active differentiation module and a comparator; The active differentiation module is configured to detect an oscillation voltage regulation rate of the series LC oscillator or the series LCC oscillator; The comparator is configured to compare the oscillation voltage regulation rate with a predetermined threshold and output a high-level signal to the controller when the oscillation voltage regulation rate is greater than the predetermined threshold.

[0008] In a preferred embodiment, the active differentiation module includes a first capacitor, a first resistor, a second capacitor, a second resistor, and an operational amplifier; The first capacitor has a first end connected to the series LC oscillator or the series LCC oscillator, and a second end connected to a first end of a first resistor; a first input terminal of the operational amplifier is connected to the second terminal of the first resistor, and an output terminal of the operational amplifier is connected to the comparator; the second capacitor has a first terminal connected to the second terminal of the first resistor and a second terminal connected to the output terminal of the operational amplifier; The second resistor has a first terminal connected to the second terminal of the first resistor and a second terminal connected to the output terminal of the operational amplifier.

[0009] In a preferred embodiment, the active differentiation unit comprises: an access module including a first diode, a third resistor and a fourth resistor, a first end of the first diode is connected to the series LC oscillator or the series LCC oscillator, and a second end of the first diode is connected to a first end of the third resistor, such that a current can flow only from the series LC oscillator or the series LCC oscillator to the third resistor; a second end of the third resistor is connected to the active differentiation module; The fourth resistor has a first end connected to the second end of the third resistor and a second end connected to ground.

[0010] In a preferred embodiment, the access module further includes a constant voltage discharge tube having a first end connected to the second end of the third resistor and a second end connected to the second end of the fourth resistor.

[0011] In a preferred embodiment, the predetermined threshold is the output value of the active differentiation module when the oscillation voltage regulation is zero.

[0012] In a preferred embodiment, the controller is configured to adjust the oscillation frequency of the series LC oscillator or series LCC oscillator so that the oscillation frequency of the series LC oscillator or series LCC oscillator is equal to or approximately equal to a predetermined frequency.

[0013] Further examples of the present application include a susceptor configured to be penetrated by a varying magnetic field and generate heat to heat the aerosol-generating product; 1. A method of controlling an aerosol generating device comprising: a series LC oscillator or a series LCC oscillator having an induction coil, the series LC oscillator or the series LCC oscillator being configured to direct a varying current through the induction coil to drive the induction coil to generate a varying magnetic field, the method comprising: Detecting an oscillation voltage regulation rate of the LCC oscillator or the series LC oscillator; generating a high level signal when the oscillation voltage regulation rate is higher than a predetermined value; and determining an oscillation frequency of the LCC oscillator or the series LC oscillator based on the interval time of the high-level signal.

[0014] In a preferred embodiment, The method further includes adjusting an oscillation frequency of the series LC oscillator or series LCC oscillator so that the oscillation frequency of the series LC oscillator or series LCC oscillator is the same as or approximately the same as a predetermined frequency. [Brief description of the drawings]

[0015] One or more embodiments are illustrated by way of example only and not by way of limitation in the accompanying drawing figures, in which elements having the same reference numerals in the drawings represent similar elements, and the drawings are not to scale unless otherwise specified. [Figure 1] FIG. 1 is a structural schematic diagram of an aerosol generating device provided in one embodiment of the present application. [Diagram 2] FIG. 2 is a structural block diagram of one embodiment of the circuit in FIG. [Diagram 3] FIG. 3 is a schematic diagram of the basic components of one embodiment of the circuit in FIG. 2. [Figure 4] FIG. 4 is a schematic diagram of the forward current in one stage of the LCC oscillator in FIG. 3. [Diagram 5] FIG. 4 is a schematic diagram of reverse current in one stage of the LCC oscillator in FIG. 3. [Figure 6] FIG. 4 is a schematic diagram of the resonant current of the series LCC oscillator in FIG. [Figure 7] FIG. 4 is a schematic diagram of the resonant current and resonant voltage fluctuations measured in the series LCC oscillator in FIG. [Figure 8] FIG. 2 is a schematic diagram of the signal variations in the three stages of an active differentiation unit. [Figure 9]FIG. 2 is a schematic diagram of a method for controlling an aerosol generating device according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] In order to facilitate the understanding of the present application, the present application will now be described in more detail with reference to the drawings and specific embodiments.

[0017] One embodiment of the present application proposes an aerosol generating device, the structure of which is shown in FIG. a cavity in which an aerosol-generating product A is removably received; an induction coil L for generating a varying magnetic field under an alternating current; a susceptor 30 extending at least partially within the cavity, the susceptor 30 being inductively coupled to an induction coil L and configured to be penetrated by a varying magnetic field to generate heat and heat an aerosol-generating product A, such as a cigarette, and volatilize at least one component of the aerosol-generating product A to form a smoking aerosol; A battery cell 10 which is a rechargeable DC battery cell and capable of outputting a DC current; and a circuit 20 that is appropriately electrically connected to the rechargeable battery cell 10 to convert the direct current output from the battery cell 10 into an alternating current having an appropriate frequency and then supplying it to the induction coil L.

[0018] Depending on the configuration of the product in use, the induction coil L may include a helically wound cylindrical induction coil as shown in FIG. 1. The helically wound cylindrical induction coil L may have a radius r in the range of about 5 mm to about 10 mm, and in particular the radius r may be about 7 mm. The length of the helically wound cylindrical induction coil L may be in the range of about 8 mm to about 14 mm, and the number of turns of the induction coil L is in the range of about 8 turns to 15 turns. Accordingly, the internal volume is about 0.15 cm. 3 From about 1.10 cm 3 may be in the range.

[0019] In a more preferred embodiment, the frequency of the alternating current supplied from the circuit 20 to the induction coil L is in the range of 80KHz to 400KHz, and more specifically, said frequency may be in the range of about 200KHz to 300KHz.

[0020] In one preferred embodiment, the DC power supply voltage provided by the battery cell 10 is in the range of about 2.5V to about 9.0V, and the amperage of DC current capable of being provided by the battery cell 10 is in the range of about 2.5A to about 20A.

[0021] In a preferred embodiment, the susceptor 30 is generally pin- or blade-shaped, which is advantageous for insertion into the aerosol-generating product A. The susceptor 30 may also have a length of about 12 millimeters, a width of about 4 millimeters, and a thickness of about 0.5 millimeters, and may be made of grade 430 stainless steel (SS430). As an alternative embodiment, the susceptor 30 may have a length of about 12 millimeters, a width of about 5 millimeters, and a thickness of about 0.5 millimeters, and may be made of grade 430 stainless steel (SS430). In another modified embodiment, the susceptor 30 may further be configured in a cylindrical or tubular shape. In use, its internal space forms a cavity for receiving the aerosol-generating product A, and generates a smoking aerosol in a manner that heats the outer periphery of the aerosol-generating product A. These susceptors may further be made of grade 420 stainless steel (SS420) and an iron-nickel-containing alloy material (e.g., permalloy).

[0022] 1, the aerosol generating device further includes a holder 40 for disposing the induction coil L and the susceptor 30, and the material of the holder 40 may include a non-metallic material that can withstand high temperatures, such as PEEK or ceramic. In practice, the induction coil L is wound and fixed on the outer wall of the holder 40. As shown in FIG. 1, the holder 40 has a hollow tubular shape, and the space of the hollow part of the tubular shape forms the cavity for receiving the aerosol generating product A.

[0023] In an alternative embodiment, the susceptor 30 is fabricated from one of the susceptible materials listed above or comprises a susceptible material coating formed by electroplating, depositing, or the like on the exterior surface of a heat-resistant substrate such as a ceramic.

[0024] The structure and basic components of a preferred embodiment of the above circuit 20 may include the following: an LCC oscillator 24, a half-bridge 23, and a half-bridge driver 22, as shown in FIGS. The LCC oscillator 24 is composed of the induction coil L, the first capacitor C1, and the second capacitor C2. The LCC oscillator 24 is used to generate an alternating magnetic field in the induction coil L by forming an alternating current flowing through the induction coil L during the oscillation process, thereby inducing the susceptor 30 to generate heat. The half bridge 23 is a half bridge circuit made up of transistor switches, and includes a switch transistor Q1 and a switch transistor Q2 for oscillating the LCC oscillator 24 by alternately switching on and off. The half-bridge driver 22 is used to control the switch transistor Q1 and the switch transistor Q2 of the half-bridge 23 to be alternately turned on and off based on a control signal from the MCU controller 21.

[0025] The complete connection manner and detailed oscillation process of the LCC oscillator 24 in the above embodiment are shown in FIG. 3. In particular, Regarding connections, the first capacitor C1 has a first terminal connected to the positive electrode of the battery cell 10, and a second terminal connected to a first terminal of the second capacitor C2. The second terminal of the second capacitor C2 is grounded via a resistor R1. The first terminal of the switch transistor Q1 of the half bridge 23 is connected to the positive electrode of the battery cell 10, and the second terminal of the switch transistor Q2 is connected to the first terminal of the switch transistor Q2, and the second terminal of the switch transistor Q2 is grounded via the resistor R1. Naturally, the controlled terminals of the switch transistor Q1 and the switch transistor Q2 are both connected to the half bridge driver 22 and are turned on and off by the drive of the half bridge driver 22. A first end of the induction coil L is connected to the second end of the switch transistor Q1, and a second end of the induction coil L is connected to the second end of the first capacitor C1. In addition, regarding the selection of hardware for the LCC oscillator 24, it is assumed that the maximum voltage values ​​of the first capacitor C1 and the second capacitor C2 are significantly higher than the output voltage value of the battery cell 10. For example, in normal implementation, the output voltage of the battery cell 10 used is mostly about 4V, but the maximum voltages of the first capacitor C1 and the second capacitor C2 used are 30 to 80V.

[0026] In the LCC oscillator 24 having the above structure, the connection states of the first capacitor C1 and the second capacitor C2 and the induction coil L change depending on the switching state of the switch transistor Q1 and the switch transistor Q2. Specifically, in FIG. 3, when the switch transistor Q1 is turned on and the switch transistor Q2 is turned off, the first capacitor C1 and the induction coil L jointly form a closed series LC circuit, while the second capacitor C2 and the induction coil L form a series LC circuit with both ends connected to the positive and negative electrodes of the battery cell 10. On the other hand, when the switch transistor Q1 is turned off and the switch transistor Q2 is turned on, the configured circuit is the opposite to the above state, the first capacitor C1 and the induction coil L form a series LC circuit with both ends connected to the positive and negative electrodes of the battery cell 10, while the second capacitor C2 and the induction coil L jointly form a closed series LC circuit. In each different state, the first capacitor C1 and the second capacitor C2 can both form their own LC circuit with the induction coil L. However, during the oscillation process of each LC circuit, the direction and period of the generated current flowing through the induction coil L are the same, and they jointly form an alternating current flowing through the induction coil L.

[0027] Specifically, the control steps of the oscillation process with the above LCC oscillator 24 are different from those of the general series or parallel LC oscillator. Furthermore, in the preferred embodiment of the present application, the complete oscillation process of the LCC oscillator 24 is described through the switching operations of the switch transistor Q1 and the switch transistor Q2, including:

[0028] In S10, the switch transistor Q1 is turned on and the switch transistor Q2 is kept in the off state, and in this state, the LCC oscillator 24 specifically completes the following two processes.

[0029] In S11, as shown in Fig. 4, when the switch transistor Q1 is turned on and the switch transistor Q2 is turned off, the battery cell 10 charges the second capacitor C2 with a current i1, and the first capacitor C1 is discharged with a current i2, and in this process, a current flows from left to right through the induction coil L shown in Fig. 4, which can be a positive current. In this stage S11, the first capacitor C1 starts discharging when the switch transistor Q1 is turned on, and completes discharging until the voltage difference between both ends becomes 0, and the second capacitor C2 stops charging when the voltage between both ends increases to be equal to the output voltage of the battery cell 10, and at this time, the current in the induction coil L reaches a maximum resonant peak.

[0030] In S12, even after the completion of step S11, the switch transistor Q1 is turned on and the switch transistor Q2 continues to be turned off, and the induction coil L discharges in the same direction as the current i2 in FIG. 1 to charge the first capacitor C1, so that the current flowing in the forward direction through the induction coil L gradually decreases until the current becomes 0 due to the discharge of the induction coil L. In this stage, since the first capacitor C1 is completely discharged in step S11, there is almost no impedance between the induction coil L and the circuit formed with the first capacitor C1 via the switch transistor Q1, so in this stage S12, the induction coil L mainly discharges to charge the first capacitor C1, and the current flowing through the induction coil L in the discharging process is the same as the current i2 in step S11. In step S11, the second capacitor C2 is charged to substantially the same output voltage as the battery cell 10, and in this stage S12, the induction coil L provides a very slight compensation to the second capacitor C2, but it is basically negligible.

[0031] In the complete process consisting of steps S11 and S12, the total current flowing through the induction coil L increases in a positive direction from 0 to a maximum, and then gradually decreases to 0 due to the discharge of the induction coil L, and the direction of the current flowing through the induction coil L is always positive from left to right.

[0032] In S20, after completing step S10, the switch transistor Q1 is turned off and the switch transistor Q2 is turned on. Specifically, the following two steps are completed:

[0033] In S21, from the time when the switch transistor Q2 is turned on, a circuit of the currents i3 and i4 shown in Fig. 5 is formed in the LCC oscillator 24. According to the current path shown in Fig. 5, the current i3 forms a circuit by passing from the positive electrode of the battery cell 10 through the first capacitor C1, the induction coil L, the switch transistor Q2, and then returning to the negative electrode of the battery cell 10 via ground. In addition, the current i4 forms a circuit by passing from the positive end of the second capacitor C2 in the counterclockwise direction shown in the figure through the induction coil L and the switch transistor Q2, and then returning to the negative end of the second capacitor C2. In this process, a current is formed that flows from right to left through the induction coil L shown in Fig. 5, which is opposite to the current direction in Fig. 4 and can be considered a negative current.

[0034] Stage S21 also includes both charging the first capacitor C1 and discharging the second capacitor C2. When the voltage of the first capacitor C1 increases to be equal to the output voltage of the battery cell 10 and when the voltage difference across the second capacitor C2 becomes zero, the current in the induction coil L reaches a maximum resonant peak.

[0035] In S22, the switch transistor Q2 continues to be turned on after completion of stage S21, and the induction coil L reverse charges the second capacitor C2, so that the current flowing in the negative direction through the induction coil L gradually decreases until the current becomes zero due to the discharge of the induction coil L.

[0036] In the complete process consisting of steps S21 and S22 of step S20, the total current flowing through the induction coil L similarly increases in the reverse direction from 0 to a maximum, and then gradually decreases to 0 as the induction coil L discharges.

[0037] Therefore, in the oscillation process of the LCC oscillator 24 described above, the fluctuation of the current flowing through the induction coil L includes four parts in one complete current cycle, which respectively correspond to the above-mentioned stages S11 / S12 / S21 / S22 in Fig. 6. In the above-mentioned steps S10 and S20, the on / off states of the switch transistor Q1 and the switch transistor Q2 are alternately and cyclically switched, so that the oscillation process of the above-mentioned stages S11 / S12 / S21 / S22 is cyclically generated in the LCC oscillator 24, and an alternating current flowing through the induction coil L can be formed.

[0038] As can be seen from the above control process, the LCC oscillator 24 of the present application generates an inverse conversion by a ZCS (zero current switching) inverter topology, which is different from the ZVS (zero voltage switching) inverter topology of the conventional LC oscillator. The switch transistor Q1 and the switch transistor Q2 are configured to switch on / off when the current flowing through the induction coil L is zero.

[0039] In the preferred embodiment shown in FIG. 3, the number of the first capacitor C1 and the second capacitor C2 is one. In other alternative embodiments, each of the first capacitor C1 and the second capacitor C2 may be composed of two or three capacitors with smaller relative capacitance values ​​connected in parallel to each other. For example, when multiple small capacitors are used instead of the relatively large capacitor that is originally required for the first capacitor C1, their capacitances are the same or almost the same, so that each of them can exhibit a significantly lowered and changing ESR (equivalent resistance value) as the oscillation frequency of the LCC oscillator 24 changes compared to the case of a single capacitor. Specifically, the ESR is relatively high in the case of low frequencies and relatively low in the case of high frequencies, which can be advantageous in preventing spike pulses. In addition, the use of multiple small capacitors instead of the relatively large capacitor that is originally required is advantageous in lowering the resonant frequency of the LCC oscillator 24.

[0040] The circuit 20 using the LCC oscillator 24 forms an inverse transformation by ZCS technology in implementation, and has a resonant frequency that is approximately half that of the conventional LC series / parallel oscillation by a single capacitor. Normally, when the frequency of the LC series / parallel oscillation is about 380Hz, the oscillation frequency of the LCC oscillator 24 is about 190KHz, which is advantageous for both synchronous detection and control of the MCU controller 21.

[0041] In addition, during the above oscillation process, the fluctuations of the resonant voltage and current of the LCC oscillator 24 obtained by detection are shown in FIG. 7, in which the resonant voltage leads the resonant current by about 1 / 4 of a period, and the entire LCC oscillator 24 shows weak inductivity. "Capacitive" and "inductive" are electrical terms related to a series-parallel circuit of an electronic device (e.g., an LC oscillator or the above LCC oscillator 24). When the capacitive reactance of a series-parallel circuit is larger than the inductive reactance, the circuit is "capacitive", and when the inductive reactance is larger than the capacitive reactance, the circuit is inductive. The "weak inductive" state is a state in which the inductive reactance and the capacitive reactance are substantially close to each other, and the inductive reactance is slightly larger than the capacitive reactance, rather than much larger than it.

[0042] Furthermore, referring to the embodiment shown in FIG. 3, the half-bridge driver 22 adopts a switch transistor driver of a common model number FD2204, which is controlled by the MCU controller 21 in a PWM manner, and alternately outputs high level / low level through the third and tenth I / O ports according to the pulse width of the PWM, thereby driving the on-time of the switch transistor Q1 and the switch transistor Q2, and controlling the oscillation of the LCC oscillator 24.

[0043] As can be seen from the above detailed control steps, the LCC inverse conversion process is symmetrical, and accordingly, the MCU controller 21 can send a PWM control signal with a duty cycle of 50% to the half-bridge driver 22 to drive the half-bridge 23 to switch in this manner.

[0044] 2, in order to accurately detect the oscillation frequency of the LCC oscillator 24, the circuit 20 further includes an active differentiation unit 25, and the detection process by the active differentiation unit 25 is as follows: Based on the characteristic that the oscillation voltage gradually becomes maximum while the current becomes zero, first, the oscillation voltage regulation rate of the LCC oscillator 24 is detected / derivative is obtained; comparing the voltage fluctuation rate or derivative with a predetermined threshold, and outputting a pulsed interrupt signal to the MCU controller 21 if the voltage fluctuation rate or derivative is greater than the predetermined threshold; and obtaining, by the MCU controller 21, the oscillation frequency of the LCC oscillator 24 based on the time interval of the received interrupt signal.

[0045] Specifically, the above process is implemented by three sub-modules of the active differentiation unit 25 shown in FIG. 3, specifically including a signal access module, an active differentiation module, and a comparison output module.

[0046] The signal access module consists of a diode D1, resistors R2 and R3, and a constant voltage discharge tube Z. Diode D1 allows the application of the positive half-wave voltage of the LCC oscillator 24, while filtering out the negative half-wave voltage, and then resistors R2 and R3 divide the voltage. Z is a constant voltage discharge tube that prevents the input voltage from becoming excessive and protects the subsequent circuitry.

[0047] The active differentiation module uses a common active differentiation circuit with standard basic devices, as shown in Figure 3, which consists of an operational amplifier U1, a capacitor C3, a resistor R4, a resistor R5, a resistor R6, a capacitor C4 and a resistor R7. The operational amplifier U1, the capacitor C3 and the resistor R4 are the essential basic components that make up the active differentiation module. The ratio of the resistor R4 to the resistor R7 is 1, which is to avoid output spikes and make the circuit have the flattest amplitude frequency response to reduce the Q value. The capacitor C4 is for voltage stabilization and to avoid the self-oscillation of the operational amplifier.

[0048] JPEG0007638376000001.jpg52164

[0049] The comparison output module is mainly a comparator U2 in Fig. 3. When the Vout output from the active differential module is greater than a predetermined threshold, it outputs a high level.

[0050] For the sake of easy understanding for those skilled in the art, FIG. 8 shows a schematic diagram of the signal variation in three stages of the active differentiation unit 25 measured in one embodiment, in which: Signal 1 is a graph of the voltage signal at a location between resistors R2 and R3 of the signal access module; Signal 2 is a graph of the voltage signal Vout output from the operational amplifier U1 of the active differentiation module; Signal 3 is a graph of a pulsed square wave output from comparator U2.

[0051] It should be explained that according to the above formula for the output voltage signal Vout, signal 2 in FIG. 8 has a negative correlation with signal 1, that is, when signal 1 is rising, the output of signal 2 is negative; when signal 1 reaches a peak, signal 2 is 0; when signal 1 starts to fall from the peak, the output of signal 2 is positive, but since the active differentiation module cannot output a negative signal, a reference value is added to the calculation result so that the output of signal 2 is always positive. Comparator U2 uses this reference value as the comparison reference, and when signal 2 starts to exceed this reference value and continues to increase, it indicates that signal 1 is in the process of starting to fall from the peak, and outputs a low level after it has finished falling. From the above, the formula is that the signal value output when signal 1 reaches its peak, that is, when the voltage regulation rate becomes 0, is the reference value of the reference input terminal of comparator U2, that is, R6*2.5 / (R5+R6).

[0052] As described above, in practice, the MCU controller 21 does not need to actively sample at a high frequency to obtain the oscillation frequency of the LCC oscillator 24, but only needs to transmit the pulsed square wave of the signal 3 to the MCU controller 21 as an interrupt signal, and after receiving the signal, the MCU controller 21 calculates the interval time (i.e., the period) between adjacent square waves to obtain the frequency. Here, the electrical term "interrupt signal" refers to a method of controlling a chip or a single-chip microcomputer-like device, and specifically refers to a method of temporarily stopping other processes or tasks when the CPU or receiving process receives the "interrupt signal", and returning to the original process or task after completing the function or process corresponding to the "interrupt signal" at the appropriate time.

[0053] As a result of the above, the active differentiation module 25 detects the voltage regulation rate or derivative of the LCC oscillator 24, performs a comparison operation to generate a square wave having the same frequency, and transmits the square wave as an interrupt signal to the MCU controller 21. After receiving the signal, the MCU controller 21 calculates the interval time (i.e., the period) between adjacent square waves to obtain the frequency.

[0054] In a further modified embodiment, the LCC oscillator 24 may be replaced or equivalently used with a series LC oscillator of the same symmetrical resonance, all of which resonate with a 50% duty cycle, outputting a symmetrical sine or cosine varying voltage or current, and switching them with a zero current topology technique. An active differentiation unit 25 may be used to track the frequency of the series LC oscillator for easy control and regulation.

[0055] A further embodiment of the present application further provides a method for controlling an aerosol generating apparatus, in which the aerosol generating apparatus drives and heats a susceptor 30 by the above-mentioned LCC oscillator 24 or a similar series LC oscillator. The steps of the method include the following steps S200 to S400, as shown in FIG. In step S100, the oscillation voltage regulation of the LCC oscillator 24 or the series LC oscillator is detected. In step S200, the oscillation voltage regulation rate is compared with a predetermined value, and if it is higher than the predetermined value, a high level signal is generated. In step S300, the oscillation frequency of the LCC oscillator 24 or the series LC oscillator is calculated and detected by detecting the interval time of the high level signal. In step S400, the oscillation frequency of the LCC oscillator 24 or the series LC oscillator may be further adjusted by the MCU controller 21 to be equal to or approximately equal to the predetermined frequency.

[0056] By tracking and detecting the frequency and adjusting it in real time, the oscillation frequency is made to be the same or nearly the same as the predetermined frequency, thereby maximizing efficiency.

[0057] It should be noted that although the specification and drawings of this application show preferred embodiments of this application, this application is not limited to the embodiments described in this specification, and further, a person skilled in the art may make improvements and modifications based on the above description, and all such improvements and modifications are intended to fall within the scope of protection of the appended claims of this application.

Claims

1. 1. An aerosol generating device configured to heat an aerosol generating product to generate a smoking aerosol, comprising: a susceptor configured to be penetrated by a varying magnetic field and generate heat to heat the aerosol-generating product; a series LC oscillator or a series LCC oscillator having an induction coil, the series LC oscillator or the series LCC oscillator being configured to direct a varying current through the induction coil to drive the induction coil to generate a varying magnetic field; and a circuit configured to determine the oscillation frequency of the series LC oscillator or series LCC oscillator based on the interval time between two first jumps in the oscillation voltage regulation rate of the series LC oscillator or series LCC oscillator, wherein the first jump is a change in the oscillation voltage regulation rate from a state smaller than a predetermined threshold to a state larger than the predetermined threshold.

2. The circuit comprises: an active differentiation unit configured to detect an oscillation voltage regulation rate of the series LC oscillator or series LCC oscillator, and to output a high level signal when the oscillation voltage regulation rate is greater than a predetermined threshold; The aerosol generating device of claim 1, further comprising: a controller configured to determine an oscillation frequency of the series LC oscillator or series LCC oscillator based on the interval time of the high-level signal.

3. the active differentiation unit includes an active differentiation module and a comparator; The active differentiation module is configured to detect an oscillation voltage regulation of the series LC oscillator or series LCC oscillator; The aerosol generating device according to claim 2, characterized in that the comparator is configured to compare the oscillation voltage fluctuation rate with a predetermined threshold value and output a high level signal to the controller when the oscillation voltage fluctuation rate is greater than the predetermined threshold value.

4. the active differentiation module includes a first capacitor, a first resistor, a second capacitor, a second resistor, and an operational amplifier; The first capacitor has a first end connected to the series LC oscillator or the series LCC oscillator, and a second end connected to the first end of the first resistor; a first input terminal of the operational amplifier is connected to the second terminal of the first resistor, and an output terminal of the operational amplifier is connected to the comparator; the second capacitor has a first end connected to the second end of the first resistor and a second end connected to the output end of the operational amplifier; 4. The aerosol generating device according to claim 3, wherein the second resistor has a first terminal connected to the second terminal of the first resistor and a second terminal connected to the output terminal of the operational amplifier.

5. The active differentiation unit comprises: an access module including a first diode, a third resistor and a fourth resistor, the first diode has a first end connected to the series LC oscillator or the series LCC oscillator and a second end connected to a first end of the third resistor, and is configured such that a current can flow only from the series LC oscillator or the series LCC oscillator to the third resistor; a second end of the third resistor connected to the active differentiation module; 4. The aerosol generating device of claim 3, further comprising an access module, the fourth resistor having a first end connected to the second end of the third resistor and a second end connected to ground.

6. The aerosol generating device of claim 5 , wherein the access module further comprises a constant voltage discharge tube having a first end connected to the second end of the third resistor and a second end connected to the second end of the fourth resistor.

7. 7. The aerosol generating device according to claim 3, wherein the predetermined threshold value is an output value of the active differential module when the oscillation voltage regulation rate is zero.

8. The aerosol generating device of any one of claims 2 to 6, characterized in that the controller is configured to adjust the oscillation frequency of the series LC oscillator or series LCC oscillator so that the oscillation frequency of the series LC oscillator or series LCC oscillator is the same or approximately the same as a predetermined frequency.

9. a susceptor configured to be penetrated by a varying magnetic field and generate heat to heat the aerosol-generating product; 1. A method of controlling an aerosol generating device comprising: a series LC oscillator or a series LCC oscillator having an induction coil, the series LC oscillator or the series LCC oscillator being configured to direct a varying current through the induction coil to drive the induction coil to generate a varying magnetic field, the method comprising: Detecting an oscillation voltage regulation rate of the LCC oscillator or the series LC oscillator; generating a high level signal when the oscillation voltage regulation rate is higher than a predetermined value; A method for controlling an aerosol generating device, comprising: a step of determining an oscillation frequency of the LCC oscillator or the series LC oscillator based on the interval time of the high-level signal.

10. The method for controlling an aerosol generating device according to claim 9, further comprising a step of adjusting the oscillation frequency of the series LC oscillator or the series LCC oscillator so that the oscillation frequency of the series LC oscillator or the series LCC oscillator is the same as or approximately the same as a predetermined frequency.

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