Induction heating system for aerosol generating device and control method thereof

Abstract

The invention discloses an induction heating system for an aerosol generating device and a control method thereof, and the system comprises a power module, a voltage boosting and stabilizing module, a main control module, an electromagnetic oscillation module, an induction heating module and a temperature collection module, and the voltage boosting and stabilizing module is used for boosting the output voltage of the power module and then inputting the boosted output voltage to the electromagnetic oscillation module; the electromagnetic oscillation module is used for generating a high-frequency alternating magnetic field, the induction heating module is used for heating an aerosol generating substrate under the action of the high-frequency alternating magnetic field, and the temperature acquisition module is used for acquiring real-time temperature information of the aerosol generating substrate and feeding back the real-time temperature information to the main control module; and the main control module is used for adjusting a first control signal output to the voltage boosting and stabilizing module and a second control signal output to the electromagnetic oscillation module according to the real-time temperature information, so that the heating power of the induction heating module is adjusted. The safety and reliability of the aerosol generating device are enhanced, the use experience of a user is improved, and the aerosol generating device can be applied to the technical field of aerosol generating devices.

Description

Technical Field

[0001] The present invention relates to the technical field of aerosol generating devices, and in particular to an induction heating system for an aerosol generating device and a control method thereof. Background Art

[0002] Traditional cigarette products release aerosols from the matrix (mainly tobacco) in cigarettes by igniting them to initiate the combustion process, thereby delivering unique flavors and aromas to users. During the combustion process of traditional cigarette products, the combustion temperature of the matrix exceeds 700°C, and pyrolysis reactions easily occur, thereby releasing thousands of complex chemical components, including a large number of components that are harmful to the human body, such as tar, carbon monoxide, polycyclic aromatic hydrocarbons, and tobacco-specific nitrosamines. After the aerosol containing the above components is inhaled by the user and enters the human body, it will cause a certain degree of damage to some organs and tissues of the human body.

[0003] An aerosol generating device is a device that can form an aerosol for users to inhale by heating or ultrasonic methods. The aerosol generating medium includes a liquid, gel, paste or solid aerosol generating matrix. Since the heating temperature of the aerosol generating matrix is ​​too high, it may also produce harmful components to the human body. Therefore, how to design a heating system for an aerosol generating device with accurately controlled heating temperature has become an urgent problem to be solved. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide an induction heating system for an aerosol generating device and a control method thereof, which can maintain the temperature of the aerosol generating substrate within a preset range by feedback controlling the temperature of the aerosol generating substrate and adjusting the heating power of the induction heating module in real time, thereby achieving accurate control of the heating temperature of the aerosol generating substrate, enhancing the safety and reliability of the aerosol generating device, and improving the user experience.

[0005] The first technical solution adopted by the present invention is:

[0006] An induction heating system for an aerosol generating device comprises a power supply module, a boost and voltage stabilizing module, a main control module, an electromagnetic oscillation module, an induction heating module and a temperature acquisition module, wherein the electromagnetic oscillation module is electrically connected to the power supply module via the boost and voltage stabilizing module, and the boost and voltage stabilizing module, the electromagnetic oscillation module and the temperature acquisition module are all signal-connected to the main control module, the boost and voltage stabilizing module is used to boost the output voltage of the power supply module and then input it into the electromagnetic oscillation module, the electromagnetic oscillation module is used to generate a high-frequency alternating magnetic field, the induction heating module is used to heat an aerosol generating matrix under the action of the high-frequency alternating magnetic field, the temperature acquisition module is used to obtain real-time temperature information of the aerosol generating matrix and feed it back to the main control module, and the main control module is used to adjust in real time a first control signal output to the boost and voltage stabilizing module and a second control signal output to the electromagnetic oscillation module according to the real-time temperature information, thereby adjusting the heating power of the induction heating module.

[0007] Furthermore, in one embodiment of the present invention, the boost voltage stabilizing module includes a first inductor, a first switch tube, a first diode and a first filter capacitor, the positive electrode of the power module is connected to one end of the first inductor, the input end of the first switch tube and the positive electrode of the first diode are both connected to the other end of the first inductor, one end of the first filter capacitor and the input end of the electromagnetic oscillation module are both connected to the negative electrode of the first diode, the other end of the first filter capacitor, the output end of the electromagnetic oscillation module and the output end of the first switch tube are all connected to the negative electrode of the power module, and the main control module outputs the first control signal to the control end of the first switch tube.

[0008] Furthermore, in one embodiment of the present invention, the first control signal is a first pulse width modulation signal, and the main control module adjusts the duty cycle of the first pulse width modulation signal according to the real-time temperature information, thereby controlling the on / off of the first switch tube, thereby adjusting the output voltage of the boost regulator module.

[0009] Furthermore, in one embodiment of the present invention, the electromagnetic oscillation module includes a first choke inductor, a second choke inductor, a second switch tube, a third switch tube, a first resonant capacitor and a first induction coil, one end of the first choke inductor and one end of the second choke inductor are both connected to the voltage output end of the boost and voltage stabilization module, the input end of the second switch tube, one end of the first resonant capacitor and one end of the first induction coil are all connected to the other end of the first choke inductor, the input end of the third switch tube, the other end of the second resonant capacitor and the other end of the first induction coil are all connected to the other end of the second choke inductor, the output end of the second switch tube and the output end of the third switch tube are both connected to the negative pole of the power module, the first induction coil is used to generate the high-frequency alternating magnetic field, and the main control module outputs the second control signal to the control end of the second switch tube and the control end of the third switch tube.

[0010] Furthermore, in one embodiment of the present invention, the second control signal includes a second pulse width modulation signal and a third pulse width modulation signal, and the main control module adjusts the duty cycle of the second pulse width modulation signal and the duty cycle of the third pulse width modulation signal according to the real-time temperature information, thereby respectively controlling the on / off of the second switch tube and the on / off of the third switch tube, thereby adjusting the output power of the electromagnetic oscillation module.

[0011] Furthermore, in one embodiment of the present invention, the induction heating system also includes a buck and voltage stabilizing module, and the main control module is electrically connected to the power module via the buck and voltage stabilizing module, and the buck and voltage stabilizing module is used to step down the output voltage of the power module and then input it into the main control module.

[0012] The second technical solution adopted by the present invention is:

[0013] A control method for an induction heating system for an aerosol generating device, which is implemented by the induction heating system for an aerosol generating device, comprises the following steps:

[0014] Acquiring real-time temperature information of the aerosol generating substrate through the temperature acquisition module, and feeding back the real-time temperature information to the main control module;

[0015] Determining, by the main control module, a temperature change rate of the aerosol generating substrate according to the real-time temperature information, and determining a current heating stage of the aerosol generating substrate according to the temperature change rate and the real-time temperature information;

[0016] Determine a power modulation mode of the main control module according to the current heating stage, wherein the power modulation mode includes a voltage modulation mode, an oscillation modulation mode and a mixed modulation mode;

[0017] The first control signal and / or the second control signal are adjusted by the main control module according to the power modulation mode and the real-time temperature information, thereby adjusting the heating power of the induction heating module.

[0018] Further, in one embodiment of the present invention, the step of determining the current heating stage of the aerosol generating substrate according to the temperature change rate and the real-time temperature information:

[0019] When the real-time temperature information at the current moment is less than a preset first threshold, and the real-time temperature information before the current moment is less than the first threshold, it is determined that the aerosol generating substrate is in the initial heating stage;

[0020] When the real-time temperature information is greater than or equal to the first threshold before the current moment, and the temperature change rate is less than a preset second threshold, it is determined that the aerosol generating substrate is in the temperature maintenance stage;

[0021] When the real-time temperature information is greater than or equal to the first threshold before the current moment, and the temperature change rate is greater than or equal to a preset second threshold, it is determined that the aerosol generating substrate is in the aerosol inhalation stage.

[0022] Further, in an embodiment of the present invention, the step of determining the power modulation mode of the main control module according to the current heating stage specifically includes:

[0023] When the aerosol generating substrate is in the initial heating stage, determining that the main control module uses a voltage modulation mode to adjust the heating power of the induction heating module;

[0024] When the aerosol generating substrate is in the temperature maintaining stage, determining that the main control module uses an oscillation modulation mode to adjust the heating power of the induction heating module;

[0025] When the aerosol generating substrate is in the aerosol suction stage, determining that the main control module uses a mixed modulation mode to adjust the heating power of the induction heating module;

[0026] Among them, in the voltage modulation mode, the heating power of the induction heating module is adjusted by adjusting the duty cycle of the first control signal, in the oscillation modulation mode, the heating power of the induction heating module is adjusted by adjusting the duty cycle of the second control signal, and in the mixed modulation mode, the heating power of the induction heating module is adjusted by adjusting the duty cycle of the first control signal and the duty cycle of the second control signal.

[0027] Further, in one embodiment of the present invention, the step of adjusting the first control signal and / or the second control signal according to the power modulation mode and the real-time temperature information by the main control module specifically includes:

[0028] When the power modulation mode is the voltage modulation mode, determining a first control coefficient corresponding to the voltage modulation mode, determining a first duty cycle according to the real-time temperature information, the first threshold, and the first control coefficient, adjusting the first control signal according to the first duty cycle, and then sending the adjusted first control signal to the boost stabilization module;

[0029] When the power modulation mode is the oscillation modulation mode, determining a second control coefficient corresponding to the oscillation modulation mode, determining a second duty cycle according to the real-time temperature information, the first threshold value, and the second control coefficient, adjusting the second control signal according to the second duty cycle, and then sending the adjusted second control signal to the electromagnetic oscillation module;

[0030] When the power modulation mode is the hybrid modulation mode, determining a third control coefficient and a fourth control coefficient corresponding to the hybrid modulation mode, determining a third duty cycle according to the real-time temperature information, the first threshold and the third control coefficient, determining a fourth duty cycle according to the real-time temperature information, the first threshold and the fourth control coefficient, adjusting the first control signal according to the third duty cycle, adjusting the fourth control signal according to the fourth duty cycle, and then sending the adjusted first control signal to the boost voltage stabilization module, and sending the adjusted second control signal to the electromagnetic oscillation module;

[0031] Among them, the first control coefficient includes a first proportional gain, a first integral gain and a first differential gain, the second control coefficient includes a second proportional gain, a second integral gain and a second differential gain, the third control coefficient includes a third proportional gain, a third integral gain and a third differential gain, and the fourth control coefficient includes a fourth proportional gain, a fourth integral gain and a fourth differential gain.

[0032] The beneficial effects of the present invention are as follows: the present invention provides an induction heating system for an aerosol generating device and a control method thereof, comprising a power supply module, a boost and voltage stabilizing module, a main control module, an electromagnetic oscillation module, an induction heating module and a temperature acquisition module, wherein the boost and voltage stabilizing module is used to boost the output voltage of the power supply module and then input it into the electromagnetic oscillation module, the electromagnetic oscillation module is used to generate a high-frequency alternating magnetic field, the induction heating module is used to heat the aerosol generating matrix under the action of the high-frequency alternating magnetic field, the temperature acquisition module is used to obtain the real-time temperature information of the aerosol generating matrix and feed it back to the main control module, the main control module is used to adjust the first control signal output to the boost and voltage stabilizing module and the second control signal output to the electromagnetic oscillation module in real time according to the real-time temperature information, thereby adjusting the heating power of the induction heating module. The embodiment of the present invention obtains the real-time temperature information of the aerosol generating substrate through the temperature acquisition module, and adjusts the control signal output to the boost and voltage stabilization module and the electromagnetic oscillation module in real time according to the real-time temperature information, thereby adjusting the heating power of the induction heating module. The temperature of the aerosol generating substrate can be maintained to fluctuate within a preset range, thereby achieving accurate control of the heating temperature of the aerosol generating substrate, enhancing the safety and reliability of the aerosol generating device, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic structural diagram of an induction heating system for an aerosol generating device provided in an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the circuit connection of a boost and voltage stabilization module provided in an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of circuit connection of an electromagnetic oscillation module provided in an embodiment of the present invention;

[0036] Figure 4 A flowchart of a method for controlling an induction heating system of an aerosol generating device provided by an embodiment of the present invention;

[0037] Figure 5 A schematic diagram of temperature changes of an aerosol generating substrate at various heating stages provided in an embodiment of the present invention.

[0038] Reference numerals:

[0039] 1. Boost voltage regulator module; 2. Main control module; 3. Electromagnetic oscillation module; 4. Induction heating module; 5. Temperature acquisition module; 6. Buck voltage regulator module; U, power module; L1, first inductor; L2, first choke inductor; L3, second choke inductor; L4, first induction coil; M1, first switch tube; M2, second switch tube; M3, third switch tube; D, first diode; C1, first filter capacitor; C2, first resonant capacitor; R, equivalent resistance of electromagnetic oscillation module; R h , the equivalent resistance of the induction heating module; PWM1, the first pulse width modulation signal; PWM2, the second pulse width modulation signal; PWM3, the third pulse width modulation signal; VCC, the output voltage of the boost and voltage regulator module. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The step numbers in the following embodiments are only provided for the convenience of explanation and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0041] In the description of the present invention, the meaning of "a plurality" is more than two. If there is a description of "a first" or "a second", it is only used to distinguish the technical features, and it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features. In addition, unless otherwise defined, all technical and scientific terms used in this article have the same meaning as those commonly understood by those skilled in the art. The terms used in this specification are only for describing specific embodiments, not for limiting the present invention.

[0042] Reference Figure 1 The embodiment of the present invention provides an induction heating system for an aerosol generating device, comprising a power module U, a boost and voltage stabilizing module 1, a main control module 2, an electromagnetic oscillation module 3, an induction heating module 4 and a temperature acquisition module 5. The electromagnetic oscillation module 3 is electrically connected to the power module U through the boost and voltage stabilizing module 1. The boost and voltage stabilizing module 1, the electromagnetic oscillation module 3 and the temperature acquisition module 5 are all signal-connected to the main control module 2. The boost and voltage stabilizing module 1 is used to boost the output voltage of the power module U and then input it to the electromagnetic oscillation module 3. The electromagnetic oscillation module 3 is used to generate a high-frequency alternating magnetic field. The induction heating module 4 is used to heat the aerosol generating matrix under the action of the high-frequency alternating magnetic field. The temperature acquisition module 5 is used to obtain the real-time temperature information of the aerosol generating matrix and feed it back to the main control module 2. The main control module 2 is used to adjust the first control signal output to the boost and voltage stabilizing module 1 and the second control signal output to the electromagnetic oscillation module 3 in real time according to the real-time temperature information, thereby adjusting the heating power of the induction heating module 4.

[0043] Specifically, the induction heating system of the embodiment of the present invention includes a power module U, a boost and voltage stabilization module 1, a main control module 2, an electromagnetic oscillation module 3, an induction heating module 4 and a temperature acquisition module 5, wherein: the power module U is used to provide electric energy for the entire induction heating system; the boost and voltage stabilization module 1 is used to increase the output voltage of the power module U to a set value and input it to the subsequent electromagnetic oscillation module 3, and the specific set value is determined by the control signal sent by the main control module 2; the electromagnetic oscillation module 3 is used to convert the DC output voltage of the boost and voltage stabilization module 1 into a high-frequency alternating voltage and current and form a high-frequency alternating magnetic field; the induction heating module 4 senses the high-frequency alternating magnetic field generated by the electromagnetic oscillation module 3, generates an electromagnetic induction effect, converts electromagnetic energy into heat energy, and then heats the aerosol generation matrix to generate aerosol; the temperature acquisition module 5 feeds back the real-time temperature information of the aerosol generation matrix to the main control module 2; the main control module 2 outputs a control signal to the boost and voltage stabilization module 1 and the electromagnetic oscillation module 3 according to a pre-set program and the real-time temperature information fed back by the temperature acquisition module 5, so as to accurately control the heating power of the induction heating module 4.

[0044] In the embodiment of the present invention, the power module U can be a lithium battery with an output voltage range of 3.3 to 4.2V; the boost and voltage stabilizing module 1 can output DC voltages of different magnitudes under the control of the main control module 2 to meet the power requirements of the subsequent modules; the electromagnetic oscillation module 3 includes one or more induction coils, which are used to generate a high-frequency alternating magnetic field under the excitation of a high-frequency alternating voltage. When the magnetic lines of force of the magnetic field pass through the induction heating module 4, eddy currents are formed in the induction heating module 4. The heat generated by the eddy current flowing through the induction heating module 4 heats the aerosol generation matrix by heat conduction, heat radiation, heat convection, etc., thereby generating an aerosol; the main control module 2 can generate a control signal by outputting a pulse width modulation signal, and change the switching quantity of the boost and voltage stabilizing module 1 and the electromagnetic oscillation module 3 by changing the frequency and duty cycle of the pulse width modulation signal, thereby adjusting the DC output voltage of the boost and voltage stabilizing module 1 and / or adjusting the output power of the electromagnetic oscillation module 3; the main control module 2 adjusts the output control signal according to the temperature signal received from the temperature acquisition module 5, thereby adjusting the heating power of the induction heating end, and maintaining the temperature of the aerosol generation matrix within a certain range.

[0045] It can be recognized that the embodiment of the present invention obtains the real-time temperature information of the aerosol generating matrix through the temperature acquisition module 5, and adjusts the control signal output to the boost and voltage stabilization module 1 and the electromagnetic oscillation module 3 in real time according to the real-time temperature information, thereby adjusting the heating power of the induction heating module 4, and can maintain the temperature of the aerosol generating matrix to fluctuate within a preset range, thereby achieving accurate control of the heating temperature of the aerosol generating matrix, enhancing the safety and reliability of the aerosol generating device, and improving the user experience.

[0046] Reference Figure 2 , further as an optional implementation, the boost and voltage stabilizing module 1 includes a first inductor L1, a first switch tube M1, a first diode D and a first filter capacitor C1, the positive electrode of the power module U is connected to one end of the first inductor L1, the input end of the first switch tube M1 and the positive electrode of the first diode D are both connected to the other end of the first inductor L1, one end of the first filter capacitor C1 and the input end of the electromagnetic oscillation module 3 are both connected to the negative electrode of the first diode D, the other end of the first filter capacitor C1, the output end of the electromagnetic oscillation module 3 and the output end of the first switch tube M1 are all connected to the negative electrode of the power module U, and the main control module 2 outputs a first control signal to the control end of the first switch tube M1.

[0047] Specifically, Figure 2 The figure shows a circuit connection diagram of the boost and voltage stabilizing module 1 provided in an embodiment of the present invention. It can be understood that the boost and voltage stabilizing module 1 in the embodiment of the present invention includes a first inductor L1, a first switch tube M1, a first diode D and a first filter capacitor C1, U represents the power module U, and R represents the equivalent resistance of the electromagnetic oscillation module 3.

[0048] Reference Figure 2 As an optional implementation, the first control signal is a first pulse width modulation signal, and the main control module 2 adjusts the duty cycle of the first pulse width modulation signal according to the real-time temperature information, thereby controlling the on / off of the first switch tube, thereby adjusting the output voltage of the boost regulator module 1.

[0049] The embodiment of the present invention controls the duty cycle d1 of the first control signal input to the first switch tube M1, thereby controlling the DC voltage V output by the boost and voltage stabilization module 1. OUT The boost stabilizing circuit of the boost stabilizing module 1 specifically includes two circuit working states. When the boost stabilizing circuit is in state 1, the first switch tube M1 is turned on, and the on time is t b,on =T b *d1,T b represents a control cycle, that is, the time for the circuit state of the boost voltage regulator module 1 to cycle once, the first diode D is reversely cut off and does not conduct. At this time, the output voltage V IN All are loaded onto the two ends of the first inductor L1. Under this voltage, the current of the first inductor L1 gradually increases, and the electric energy in the power module U is converted into magnetic energy and stored in the first inductor L1. At the same time, the first filter capacitor C1 releases the stored electric energy and supplies power to the electromagnetic oscillation module 3 (equivalent resistor R). When the boost voltage stabilization circuit switches to state 2, the first switch tube M1 is turned off, and the cut-off time is t b,off =T b*(1-d1), the first diode D is subjected to forward voltage and is turned on, the current of the first inductor L1 flows to the electromagnetic oscillation module 3 (equivalent resistor R) through the first diode D, and the magnetic field in the first inductor L1 will change the voltage polarity at both ends of the first inductor L1 to ensure that the current of the first inductor L1 remains unchanged. At this time, the power supply module U is connected in series with the first inductor L1 to supply power to the first filter capacitor C1 and the electromagnetic oscillation module 3 (equivalent resistor R), and the power supply voltage V OUT Will be greater than the output voltage V of the power module U IN , thereby achieving a boost in the output voltage of the power module U, and at the same time the first filter capacitor C1 will store part of the electrical energy.

[0050] The time for the circuit state of the boost regulator module 1 to cycle once is T b , the corresponding frequency is f b =1 / T b When the boost regulator circuit switches between state 1 and state 2 at a high frequency, a stable DC output voltage V will be generated across the load R. OUT , V OUT The size of is determined by the duty cycle of the first input switch tube M1:

[0051]

[0052] That is, when a frequency of f is input to the first switch tube M1 b , when the first pulse width modulation signal PWM1 with a duty cycle of d1 is used, the output voltage V of the boost regulator module 1 can be controlled OUT In the embodiment of the present invention, the first pulse width modulation signal PWM1 comes from the main control module 2.

[0053] Reference Figure 3 As an optional implementation, the electromagnetic oscillation module 3 includes a first choke inductor L2, a second choke inductor L3, a second switch tube M2, a third switch tube M3, a first resonant capacitor C2 and a first induction coil L4. One end of the first choke inductor L2 and one end of the second choke inductor L3 are both connected to the voltage output end of the boost and voltage stabilizing module 1. The input end of the second switch tube M2, one end of the first resonant capacitor C2 and one end of the first induction coil L4 are all connected to the other end of the first choke inductor L2. The input end of the third switch tube M3, the other end of the second resonant capacitor and the other end of the first induction coil L4 are all connected to the other end of the second choke inductor L3. The output end of the second switch tube M2 and the output end of the third switch tube M3 are both connected to the negative pole of the power module U. The first induction coil L4 is used to generate a high-frequency alternating magnetic field. The main control module 2 outputs a second control signal to the control end of the second switch tube M2 and the control end of the third switch tube M3.

[0054] Specifically, the electromagnetic oscillation module 3 of the embodiment of the present invention is implemented by an LC oscillation circuit, such as Figure 3 FIG. 1 is a circuit connection diagram of the electromagnetic oscillation module 3 provided in an embodiment of the present invention. It can be understood that the electromagnetic oscillation module 3 in the embodiment of the present invention includes a first choke inductor L2, a second choke inductor L3, a second switch tube M2, a third switch tube M3, a first resonant capacitor C2, and a first induction coil L4. h represents the equivalent resistance of the induction heating module 4.

[0055] It can be understood that the input voltage VCC of the first choke inductor L2 and the second choke inductor L3 is the output voltage V OUT When the circuit is working, the second switch tube M2 and the third switch tube M3 are turned on and off alternately to maintain LC oscillation, and the LC loop composed of the first resonant capacitor C2 and the first induction coil L4 enters the resonant state, generating a frequency of f LC The sine wave of the first choke inductor L2 or the second choke inductor L3 can be measured at one side of the LC loop, i.e., at the rear end of the first choke inductor L2 or the second choke inductor L3, due to the alternating conduction of the second switch tube M2 and the third switch tube M3, the positive half cycle of the sine wave and the negative half cycle with a voltage of 0 can be measured.

[0056] Reference Figure 3 , further as an optional implementation, the second control signal includes a second pulse width modulation signal and a third pulse width modulation signal, and the main control module 2 adjusts the duty cycle of the second pulse width modulation signal and the duty cycle of the third pulse width modulation signal according to the real-time temperature information, and then controls the on / off of the second switch tube and the on / off of the third switch tube respectively, thereby adjusting the output power of the electromagnetic oscillation module 3.

[0057] It can be understood that, in the embodiment of the present invention, the duty cycle of the second PWM signal is the same as the duty cycle of the third PWM signal, but there is a phase difference between the second PWM signal and the third PWM signal, thereby achieving alternating conduction of the second switch tube and the third switch tube.

[0058] Specifically, when the circuit is in steady state, the front-end voltage of the first choke inductor L2 or the second choke inductor L3 is VCC, and the rear-end voltage is V m *sin(wt),V m represents the peak value of the rear-end voltage, w represents the oscillation angular velocity of the LC oscillation circuit, and the integral of the voltage difference across the first choke inductor L2 or the second choke L3 within one cycle is 0, that is, the voltage across the first choke inductor L2 or the second choke L3 is 0 within one oscillation cycle T LC If the average values ​​are equal, then:

[0059]

[0060] get:

[0061] V m =VCC*π (3)

[0062] When the LC circuit is in a resonant state, the peak current in the circuit reaches its maximum and satisfies the following equation:

[0063]

[0064] At this time, the heating power generated on the receptor of the induction heating module 4 is:

[0065]

[0066] Among them, I m represents the peak current of the LC circuit, R h represents the equivalent resistance of the induction heating module 4.

[0067] It can be seen that when the input duty cycle d1 of the boost and voltage regulator module 1 is controlled, the heating power P of the induction heating module 4 can be controlled by controlling the output voltage of the boost and voltage regulator module 1. I .

[0068] In addition, according to the law of conservation of energy, the net energy Q received by the receptor is:

[0069]

[0070] Among them, Q IN represents the total heating energy, Q LOSS represents the heating energy loss value, t represents the induction heating time, P LOSS Indicates the heating power loss value.

[0071] From the integral formula in formula (6), it can be seen that by changing the duty cycle d2 of the control signal input to the second switch tube M2 and the third switch tube M3 of the LC oscillator circuit, the net energy Q received by the receptor can be changed, thereby changing the temperature T of the aerosol generating matrix. I .

[0072] From the circuit principle, by changing the duty cycle d2 of the control signal input to the second switch tube M2 and the third switch tube M3 of the LC oscillator circuit, the conduction time of the second switch tube M2 and the third switch tube M3 can be controlled. According to the principle of switch tube conduction / cutoff control, the conduction time t LC,on =T LC *d2, when the duty cycle d2 is larger, the conduction time of the second switch tube and the third switch tube is longer, the opening time of the LC oscillation circuit (the sum of the conduction time of the second switch tube and the third switch tube) is longer, the time that the sensor is in the heating state is longer, and the net energy that can be received is greater.

[0073] Reference Figure 1 As an optional implementation, the induction heating system further includes a buck-stabilizing module 6, through which the main control module 2 is electrically connected to the power module U, and the buck-stabilizing module 6 is used to step down the output voltage of the power module U and input it into the main control module 2.

[0074] Specifically, the voltage-stepping and voltage-stabilizing module 6 is used to step down the output voltage of the power module U and then input the voltage to the main control module 2 to supply power to the main control module 2 .

[0075] The above is a description of the system structure of the embodiment of the present invention. The working principle and workflow of the embodiment of the present invention will be further described below in conjunction with the control method.

[0076] Reference Figure 4 The embodiment of the present invention provides a control method for an induction heating system for an aerosol generating device, which is executed by the induction heating system for an aerosol generating device, and includes the following steps:

[0077] S101, obtaining real-time temperature information of the aerosol generating matrix through a temperature acquisition module, and feeding back the real-time temperature information to a main control module;

[0078] S102, determining the temperature change rate of the aerosol generating substrate according to the real-time temperature information through the main control module, and determining the current heating stage of the aerosol generating substrate according to the temperature change rate and the real-time temperature information;

[0079] S103, determining a power modulation mode of the main control module according to the current heating stage, where the power modulation mode includes a voltage modulation mode, an oscillation modulation mode, and a mixed modulation mode;

[0080] S104: adjusting the first control signal and / or the second control signal according to the power modulation mode and the real-time temperature information through the main control module, thereby adjusting the heating power of the induction heating module.

[0081] The embodiment of the present invention obtains the real-time temperature information of the aerosol generating substrate through the temperature acquisition module, and adjusts the control signal output to the boost and voltage stabilization module and the electromagnetic oscillation module in real time according to the real-time temperature information, thereby adjusting the heating power of the induction heating module. The temperature of the aerosol generating substrate can be maintained to fluctuate within a preset range, thereby achieving accurate control of the heating temperature of the aerosol generating substrate, enhancing the safety and reliability of the aerosol generating device, and improving the user experience.

[0082] As a further optional embodiment, the step of determining the current heating stage of the aerosol generating substrate according to the temperature change rate and the real-time temperature information:

[0083] When the real-time temperature information at the current moment is less than a preset first threshold, and the real-time temperature information before the current moment is less than the first threshold, it is determined that the aerosol generating substrate is in the initial heating stage;

[0084] When the real-time temperature information before the current moment is greater than or equal to the first threshold, and the temperature change rate is less than a preset second threshold, it is determined that the aerosol generating substrate is in the temperature maintenance stage;

[0085] When the real-time temperature information before the current moment is greater than or equal to the first threshold, and the temperature change rate is greater than or equal to the preset second threshold, it is determined that the aerosol generating substrate is in the aerosol inhalation stage.

[0086] Specifically, Figure 5 The figure shows the temperature change of each heating stage of the aerosol generating substrate provided by the embodiment of the present invention, wherein the corresponding aerosol generating device starts to heat the aerosol generating substrate at t=0. The heating of the aerosol generating substrate is divided into three stages: the initial heating stage (stage 1, 0 to t1), the aerosol generating device starts to heat the aerosol generating substrate, and within a certain period of time, the temperature T of the aerosol generating substrate is rapidly increased from room temperature to a set temperature T s (i.e., the first threshold). At this stage, the temperature of the aerosol generating matrix changes greatly, and the required heating power also changes greatly. It can be deduced from formulas (1)-(5) that the heating power P I With duty cycle d1 -2 positively correlated, that is, a small change in duty cycle d1 can cause the heating power P I Therefore, in the initial heating stage of the aerosol generating substrate, using the PWM signal to control the duty cycle d1 and then control the output voltage is more conducive to quickly and accurately controlling the temperature T of the aerosol generating substrate; in the temperature maintenance stage (stage 2, t1 to t2), when the temperature of the aerosol generating substrate reaches the set temperature T sAfter that, due to the heat loss of the aerosol matrix during the heating process, a certain amount of heating power is still needed to supplement this part of the heat to maintain the temperature T of the aerosol matrix unchanged or with minimal fluctuation. At this stage, the temperature change of the aerosol matrix is ​​relatively small and basically changes linearly. From formula (6), it can be seen that the net energy Q input to the receptor is approximately linearly related to the duty cycle d2. Therefore, in this stage, the method of using PWM signal to control the duty cycle d2 and then control the opening time of the LC oscillation circuit is more conducive to quickly and accurately controlling the temperature T of the aerosol generation matrix; in the aerosol suction stage (stage three, t2 to t3), when the user uses the aerosol When the gel generating device is inhaled, the airflow flows through the aerosol matrix, the thermal convection effect is enhanced, and the temperature of the aerosol matrix drops rapidly. At this stage, since the user's inhalation time is short, and the temperature acquisition module collects the real-time temperature of the aerosol generating matrix and converts the temperature signal into a digital signal and sends it to the main control module, etc., which requires a certain time interval, there will be a certain lag effect in the opening time of a single control LC oscillation circuit. In order to be able to quickly and accurately control the temperature of the aerosol generating matrix, at this time, the control duty cycle d1 will be used to increase the voltage within a certain range, and the control duty cycle d2 will be used to control the opening time of the LC oscillation circuit for mixed control.

[0087] As an optional implementation, the step of determining the power modulation mode of the main control module according to the current heating stage specifically includes:

[0088] When the aerosol generating matrix is ​​in the initial heating stage, it is determined that the main control module uses a voltage modulation mode to adjust the heating power of the induction heating module;

[0089] When the aerosol generating matrix is ​​in the temperature maintaining stage, it is determined that the main control module uses the oscillation modulation mode to adjust the heating power of the induction heating module;

[0090] When the aerosol generating matrix is ​​in the aerosol suction stage, determining that the main control module uses a mixed modulation mode to adjust the heating power of the induction heating module;

[0091] Among them, in the voltage modulation mode, the heating power of the induction heating module is adjusted by adjusting the duty cycle of the first control signal, in the oscillation modulation mode, the heating power of the induction heating module is adjusted by adjusting the duty cycle of the second control signal, and in the mixed modulation mode, the heating power of the induction heating module is adjusted by adjusting the duty cycle of the first control signal and the duty cycle of the second control signal.

[0092] As an optional implementation, the step of adjusting the first control signal and / or the second control signal according to the power modulation mode and the real-time temperature information by the main control module specifically includes:

[0093] When the power modulation mode is the voltage modulation mode, determining a first control coefficient corresponding to the voltage modulation mode, determining a first duty cycle according to the real-time temperature information, the first threshold value and the first control coefficient, adjusting the first control signal according to the first duty cycle, and then sending the adjusted first control signal to the boost and voltage stabilization module;

[0094] When the power modulation mode is the oscillation modulation mode, determining a second control coefficient corresponding to the oscillation modulation mode, determining a second duty cycle according to the real-time temperature information, the first threshold value and the second control coefficient, adjusting the second control signal according to the second duty cycle, and then sending the adjusted second control signal to the electromagnetic oscillation module;

[0095] When the power modulation mode is a hybrid modulation mode, determine the third control coefficient and the fourth control coefficient corresponding to the hybrid modulation mode, determine the third duty cycle according to the real-time temperature information, the first threshold and the third control coefficient, determine the fourth duty cycle according to the real-time temperature information, the first threshold and the fourth control coefficient, adjust the first control signal according to the third duty cycle, adjust the fourth control signal according to the fourth duty cycle, and then send the adjusted first control signal to the boost voltage stabilization module, and send the adjusted second control signal to the electromagnetic oscillation module;

[0096] Among them, the first control coefficient includes a first proportional gain, a first integral gain and a first differential gain, the second control coefficient includes a second proportional gain, a second integral gain and a second differential gain, the third control coefficient includes a third proportional gain, a third integral gain and a third differential gain, and the fourth control coefficient includes a fourth proportional gain, a fourth integral gain and a fourth differential gain.

[0097] Specifically, in order to achieve accurate automatic control of the heating temperature of the aerosol generating substrate, a PID automatic control algorithm is introduced in the embodiment of the present invention, that is, the PID control algorithm will be written into the main control module, and the real-time temperature of the aerosol generating substrate will be collected in real time by the temperature acquisition module and transmitted to the main control module for corresponding calculation.

[0098] When the power modulation mode is the voltage modulation mode, the collected real-time temperature T(t) is input into the corresponding PID operation expression, and the first duty cycle d1 calculated at the same time is as follows:

[0099]

[0100] e(t)=T(t)-T s (8)

[0101] Where t represents time, T(t) represents the real-time temperature of the aerosol generation matrix collected by the temperature collection module, and T srepresents the set first threshold, e(t) represents the difference between the real-time temperature and the first threshold, K p1 Represents the first proportional gain, K i1 Represents the first integral gain, K d1 Represents the first differential gain.

[0102] When the power modulation mode is the oscillation modulation mode, the collected real-time temperature T(t) is input into the corresponding PID operation expression, and the second duty cycle d2 calculated at the same time is as follows:

[0103]

[0104] Among them, K p2 Represents the second proportional gain, K i2 represents the second integral gain, K d2 represents the second differential gain;

[0105] When the power modulation mode is the mixed modulation mode, the collected real-time temperature T(t) is input into the corresponding PID operation expression, and the third duty cycle d3 and the fourth duty cycle d4 calculated at the same time are as follows:

[0106]

[0107]

[0108] Among them, K p3 Represents the third proportional gain, K i3 represents the third integral gain, K d3 represents the third differential gain, K p4 represents the fourth proportional gain, K i4 represents the fourth integral gain, K d4 Represents the fourth differential gain.

[0109] It should be noted that the first control coefficient (K p1 , K i1 , K d1 ), the second control coefficient (K p2 , K i2 , K d2 ), the third control coefficient (K p3 , K i3 , K d3 ) and the fourth control coefficient (K p4 , K i4 , K d4 ) need to be pre-calibrated through experiments, and the embodiments of the present invention do not limit the specific values.

[0110] It can be understood that the contents of the above system embodiments are all applicable to the present method embodiments, the functions specifically implemented by the present method embodiments are the same as those of the above system embodiments, and the beneficial effects achieved are also the same as those achieved by the above system embodiments.

[0111] It should be appreciated that embodiments of the present invention may be implemented or enforced by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable memory. The above methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with a computer program, wherein the storage medium so configured causes the computer to operate in a specific and predefined manner, according to the methods and drawings described in the specific embodiments. Each program may be implemented in a high-level procedural or object-oriented programming language to communicate with a computer system. However, if desired, the program may be implemented in an assembly or machine language. In any case, the language may be a compiled or interpreted language. In addition, the program may be run on a programmed dedicated integrated circuit for this purpose.

[0112] Furthermore, the operations of the processes described herein may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and / or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) that is executed collectively on one or more processors, by hardware, or a combination thereof. The computer programs described above include a plurality of instructions that may be executed by one or more processors.

[0113] Further, the above method can be implemented in any type of computing platform that is operably connected to a suitable computer, including but not limited to a personal computer, a minicomputer, a mainframe, a workstation, a network or distributed computing environment, a separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, etc. Various aspects of the present invention can be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, an optical read and / or write storage medium, a RAM, a ROM, etc., so that it can be read by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the process described herein. In addition, the machine-readable code, or a portion thereof, can be transmitted via a wired or wireless network. When such media includes instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor, the invention described herein includes these and other different types of non-transitory computer-readable storage media. When programmed according to the methods and techniques described in the present invention, the present invention also includes the computer itself.

[0114] The computer program can be applied to input data to perform the functions described herein, thereby converting the input data to generate output data stored in a non-volatile memory. The output information can also be applied to one or more output devices such as a display. In a preferred embodiment of the present invention, the converted data represents physical and tangible objects, including specific visual depictions of physical and tangible objects produced on the display.

[0115] The above is only a preferred embodiment of the present invention. The present invention is not limited to the above implementation. As long as the technical effect of the present invention is achieved by the same means, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the present invention. Within the scope of protection of the present invention, its technical scheme and / or implementation method may have various modifications and changes.

Claims

1. An induction heating system for an aerosol generating device, characterized in that: It includes a power module, a boost and voltage stabilizing module, a main control module, an electromagnetic oscillation module, an induction heating module and a temperature acquisition module. The electromagnetic oscillation module is electrically connected to the power module through the boost and voltage stabilizing module. The boost and voltage stabilizing module, the electromagnetic oscillation module and the temperature acquisition module are all connected to the main control module signal. The boost and voltage stabilizing module is used to boost the output voltage of the power module and then input it to the electromagnetic oscillation module. The electromagnetic oscillation module is used to generate a high-frequency alternating magnetic field. The induction heating module is used to heat the aerosol generating matrix under the action of the high-frequency alternating magnetic field. The temperature acquisition module is used to obtain the real-time temperature information of the aerosol generating matrix and feed it back to the main control module. The main control module is used to adjust the first control signal output to the boost and voltage stabilizing module and the second control signal output to the electromagnetic oscillation module in real time according to the real-time temperature information, thereby adjusting the heating power of the induction heating module.

2. The induction heating system for an aerosol generating device according to claim 1, characterized in that: The boost voltage stabilization module includes a first inductor, a first switch tube, a first diode and a first filter capacitor. The positive electrode of the power module is connected to one end of the first inductor, the input end of the first switch tube and the positive electrode of the first diode are both connected to the other end of the first inductor, one end of the first filter capacitor and the input end of the electromagnetic oscillation module are both connected to the negative electrode of the first diode, the other end of the first filter capacitor, the output end of the electromagnetic oscillation module and the output end of the first switch tube are all connected to the negative electrode of the power module, and the main control module outputs the first control signal to the control end of the first switch tube.

3. The induction heating system for an aerosol generating device according to claim 2, characterized in that: The first control signal is a first pulse width modulation signal. The main control module adjusts the duty cycle of the first pulse width modulation signal according to the real-time temperature information, thereby controlling the on / off of the first switch tube, thereby adjusting the output voltage of the boost and voltage stabilization module.

4. The induction heating system for an aerosol generating device according to claim 1, characterized in that: The electromagnetic oscillation module includes a first choke inductor, a second choke inductor, a second switch tube, a third switch tube, a first resonant capacitor and a first induction coil. One end of the first choke inductor and one end of the second choke inductor are both connected to the voltage output end of the boost and voltage stabilization module. The input end of the second switch tube, one end of the first resonant capacitor and one end of the first induction coil are all connected to the other end of the first choke inductor. The input end of the third switch tube, the other end of the second resonant capacitor and the other end of the first induction coil are all connected to the other end of the second choke inductor. The output end of the second switch tube and the output end of the third switch tube are both connected to the negative pole of the power module. The first induction coil is used to generate the high-frequency alternating magnetic field. The main control module outputs the second control signal to the control end of the second switch tube and the control end of the third switch tube.

5. The induction heating system for an aerosol generating device according to claim 4, characterized in that: The second control signal includes a second pulse width modulation signal and a third pulse width modulation signal. The main control module adjusts the duty cycle of the second pulse width modulation signal and the duty cycle of the third pulse width modulation signal according to the real-time temperature information, and then controls the on / off of the second switch tube and the on / off of the third switch tube respectively, thereby adjusting the output power of the electromagnetic oscillation module.

6. The induction heating system for an aerosol generating device according to claim 1, characterized in that: The induction heating system further comprises a step-down and voltage stabilizing module, through which the main control module is electrically connected to the power module, and the step-down and voltage stabilizing module is used to step down the output voltage of the power module and then input it into the main control module.

7. A control method for an induction heating system for an aerosol generating device, for execution by the induction heating system for an aerosol generating device according to any one of claims 1 to 6, characterized in that: The following steps are involved: Acquiring real-time temperature information of the aerosol generating substrate through the temperature acquisition module, and feeding back the real-time temperature information to the main control module; Determining, by the main control module, a temperature change rate of the aerosol generating substrate according to the real-time temperature information, and determining a current heating stage of the aerosol generating substrate according to the temperature change rate and the real-time temperature information; Determine a power modulation mode of the main control module according to the current heating stage, wherein the power modulation mode includes a voltage modulation mode, an oscillation modulation mode and a mixed modulation mode; The first control signal and / or the second control signal are adjusted by the main control module according to the power modulation mode and the real-time temperature information, thereby adjusting the heating power of the induction heating module.

8. The control method for an induction heating system of an aerosol generating device according to claim 7, characterized in that: The step of determining the current heating stage of the aerosol generating substrate according to the temperature change rate and the real-time temperature information: When the real-time temperature information at the current moment is less than a preset first threshold, and the real-time temperature information before the current moment is less than the first threshold, it is determined that the aerosol generating substrate is in the initial heating stage; When the real-time temperature information is greater than or equal to the first threshold before the current moment, and the temperature change rate is less than a preset second threshold, it is determined that the aerosol generating substrate is in the temperature maintenance stage; When the real-time temperature information is greater than or equal to the first threshold before the current moment, and the temperature change rate is greater than or equal to a preset second threshold, it is determined that the aerosol generating substrate is in the aerosol inhalation stage.

9. A control method for an induction heating system for an aerosol generating device according to claim 8, characterized in that: The step of determining the power modulation mode of the main control module according to the current heating stage specifically includes: When the aerosol generating substrate is in the initial heating stage, determining that the main control module uses a voltage modulation mode to adjust the heating power of the induction heating module; When the aerosol generating substrate is in the temperature maintaining stage, determining that the main control module uses an oscillation modulation mode to adjust the heating power of the induction heating module; When the aerosol generating substrate is in the aerosol suction stage, determining that the main control module uses a mixed modulation mode to adjust the heating power of the induction heating module; Among them, in the voltage modulation mode, the heating power of the induction heating module is adjusted by adjusting the duty cycle of the first control signal, in the oscillation modulation mode, the heating power of the induction heating module is adjusted by adjusting the duty cycle of the second control signal, and in the mixed modulation mode, the heating power of the induction heating module is adjusted by adjusting the duty cycle of the first control signal and the duty cycle of the second control signal.

10. A control method for an induction heating system for an aerosol generating device according to claim 9, characterized in that: The step of adjusting the first control signal and / or the second control signal according to the power modulation mode and the real-time temperature information by the main control module specifically includes: When the power modulation mode is the voltage modulation mode, determining a first control coefficient corresponding to the voltage modulation mode, determining a first duty cycle according to the real-time temperature information, the first threshold, and the first control coefficient, adjusting the first control signal according to the first duty cycle, and then sending the adjusted first control signal to the boost stabilization module; When the power modulation mode is the oscillation modulation mode, determining a second control coefficient corresponding to the oscillation modulation mode, determining a second duty cycle according to the real-time temperature information, the first threshold value, and the second control coefficient, adjusting the second control signal according to the second duty cycle, and then sending the adjusted second control signal to the electromagnetic oscillation module; When the power modulation mode is the hybrid modulation mode, determining a third control coefficient and a fourth control coefficient corresponding to the hybrid modulation mode, determining a third duty cycle according to the real-time temperature information, the first threshold and the third control coefficient, determining a fourth duty cycle according to the real-time temperature information, the first threshold and the fourth control coefficient, adjusting the first control signal according to the third duty cycle, adjusting the fourth control signal according to the fourth duty cycle, and then sending the adjusted first control signal to the boost voltage stabilization module, and sending the adjusted second control signal to the electromagnetic oscillation module; Among them, the first control coefficient includes a first proportional gain, a first integral gain and a first differential gain, the second control coefficient includes a second proportional gain, a second integral gain and a second differential gain, the third control coefficient includes a third proportional gain, a third integral gain and a third differential gain, and the fourth control coefficient includes a fourth proportional gain, a fourth integral gain and a fourth differential gain.

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