Control method, device and equipment for microwave heating smoking set and medium

Abstract

The invention provides a control method, device and equipment of a microwave heating smoking set and a medium, and relates to the technical field of microwave heating smoking sets. According to the method, the minimum heating power meeting the heating requirement and the target leakage pressure corresponding to the minimum heating power can be determined according to the target fuming temperature in each of the multiple heating stages at different fuming temperatures, and the actual output power is dynamically adjusted through the duty ratio to compensate temperature fluctuation in real time with the target leakage pressure as the benchmark. The peak power of the dynamic target leakage voltage output by the DCDC module in each stage only ensures that the heating requirement in the stage is met, high-power operation in the whole process is avoided, and the DCDC output voltage is reduced. Therefore, the input and output pressure difference of the DCDC module is reduced, the energy conversion efficiency is improved, and the heating energy efficiency of the microwave heating smoking set is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of microwave heating smoking set, in particular to a control method, device, equipment and medium of microwave heating smoking set. BACKGROUND

[0002] The microwave heating non-combustion cigarette product is a new type of smoking substrate product, which still uses the traditional smoking substrate as the base material and needs to be matched with a microwave heating non-combustion smoking set. The microwave heating non-combustion smoking set uses microwaves to promote the release of effective components in the smoking substrate to generate smoke. For example, the microwave heating non-combustion smoking set uses a lithium battery as an energy source, and a DCDC module is used to boost the voltage, and then a power amplifier chip is used to output microwave energy to heat the smoking substrate. Since the response speed of the duty cycle control mode is fast, the existing heating control mode usually uses a PWM wave to control the output duty cycle of the DCDC module.

[0003] In order to meet the needs of different user modes, different microwave energy needs to be output, such as a rich mode with a large heating power or a soft mode with a small heating power. In addition, in the same user mode, the microwave energy is also different in different heating stages, for example, the preheating stage requires fast temperature rise and large heating power, and the holding stage requires constant temperature and small heating power. In order to meet the needs of different power output, the existing technology usually sets a large power amplifier according to the peak power requirement. The temperature is controlled by modulating the duty cycle based on the peak power heating. However, the large power amplifier needs high voltage driving, and the energy conversion efficiency of the DCDC module is low, but the energy storage of the lithium battery is limited, which leads to poor energy efficiency of the microwave heating smoking set. SUMMARY

[0004] The embodiments of the present application provide a control method, device, equipment and medium of a microwave heating smoking set to solve the problem of poor energy efficiency of the existing heating control mode of the microwave heating smoking set.

[0005] In a first aspect, the embodiments of the present application provide a control method of a microwave heating smoking set, the smoking set comprising a DCDC module, a microwave amplification heating module and a control module; the control module is connected to the DCDC module; the DCDC module is connected to the drain of the microwave amplification heating module; the method comprises: obtaining a target smoking temperature of a target stage; the target stage is any one of a plurality of heating stages; the target smoking temperatures of adjacent heating stages are different; determining a corresponding target drain voltage according to the target smoking temperature; wherein the target drain voltage is not less than the drain voltage corresponding to the minimum heating power required to reach the target smoking temperature; obtaining an actual smoking temperature; controlling the DCDC module to output the target drain voltage, and controlling the output duty cycle of the DCDC module to adjust the actual smoking temperature with the target smoking temperature as the temperature control target.

[0006] In a possible implementation, the switching condition of adjacent heating stages comprises at least one of the following: the actual smoking temperature maintaining the target smoking temperature for a time length reaching a preset threshold, the number of user puffs reaching a preset number, or the remaining power being lower than a preset power.

[0007] In a possible implementation, the heating stages sequentially comprise, in time sequence, a preheating stage, a holding stage, and a terminal stage.

[0008] In a possible implementation, the target smoking temperature of the preheating stage is greater than the target smoking temperature of the terminal stage; and the target smoking temperature of the terminal stage is greater than the target smoking temperature of the holding stage.

[0009] In a possible implementation, the duty cycle ranges from 1% to 100%.

[0010] In a possible implementation, the determining the corresponding target drain voltage according to the target smoking temperature comprises: obtaining a preset temperature-drain voltage mapping table; the mapping table stores a correspondence between different target smoking temperatures and unique target drain voltages; and matching the corresponding target drain voltage in the mapping table according to the current target smoking temperature.

[0011] In a possible implementation, the controlling the output duty cycle of the DCDC module and adjusting the actual smoking temperature with the target smoking temperature as the temperature control target comprises: calculating a difference between the actual smoking temperature and the target smoking temperature; and adjusting the output duty cycle of the DCDC module according to the difference by using a PID algorithm, so that the actual smoking temperature converges to the target smoking temperature.

[0012] In a second aspect, an embodiment of the present application provides a control device of a microwave heating smoking set, the smoking set comprising a DCDC module, a microwave amplification heating module, and a control module; the control module is connected to the DCDC module; the DCDC module is connected to a drain electrode of the microwave amplification heating module; and the device comprises: a target temperature obtaining module configured to obtain a target smoking temperature of a target stage; the target stage is any one of a plurality of heating stages; and target smoking temperatures of adjacent heating stages are different; a target drain voltage determining module configured to determine a corresponding target drain voltage according to the target smoking temperature; wherein the target drain voltage is not less than a drain voltage corresponding to a minimum heating power reaching the target smoking temperature; an actual temperature obtaining module configured to obtain an actual smoking temperature; a control module configured to control the DCDC module to output the target drain voltage, and control the output duty cycle of the DCDC module and adjust the actual smoking temperature with the target smoking temperature as the temperature control target.

[0013] Thirdly, embodiments of the present invention provide an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method described in the first aspect or any possible implementation thereof.

[0014] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described in the first aspect or any possible implementation thereof.

[0015] Fifthly, embodiments of the present invention provide a computer program product, including a computer program that, when executed by a processor, implements the method described in the first aspect or any possible implementation thereof.

[0016] This invention provides a control method, apparatus, device, and medium for microwave heating smoke appliances. In each of the multiple heating stages at different smoke temperatures, the minimum heating power and its corresponding target leakage voltage are determined based on the target smoke temperature. Using the target leakage voltage as a reference, the actual output power is dynamically adjusted via duty cycle to compensate for temperature fluctuations in real time. The peak power of the dynamic target leakage voltage output by the DC-DC module at each stage only ensures that the heating requirements of that stage are met, avoiding high-power operation throughout the entire process and reducing the DC-DC output voltage. Therefore, the input-output voltage difference of the DC-DC module is reduced, the energy conversion efficiency is improved, and the heating energy efficiency of the microwave heating smoke appliance is enhanced. Attached Figure Description

[0017] Figure 1 This is an application scenario diagram of the control method for microwave heating smoke apparatus provided in the embodiments of the present invention; Figure 2 This is a schematic diagram of the boost output voltage and conversion efficiency curve of the DC-DC module provided in this embodiment of the invention; Figure 3 This is a flowchart illustrating the implementation of the control method for a microwave heating smoke appliance provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the control strategy and temperature curve provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the leakage voltage and output power curves of the microwave energy chip provided in the embodiment of the present invention; Figure 6 This is a schematic diagram of the leakage voltage and microwave conversion efficiency curves of the microwave energy chip provided in this embodiment of the invention; Figure 7 This is a schematic diagram of the control device for a microwave heating smoke set provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0018] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] Microwave-heated non-combustible smoking devices utilize the penetrating power of microwaves to cause frictional heating, resulting in the periodic reorientation of polar molecules in the smoke-generating matrix following the alternating microwave signal. This process releases the active ingredients in the smoke-generating matrix to produce smoke. Microwave-heated non-combustible smoke-generating matrix products use traditional smoke-generating matrices, but through optimized processes, they generate smoke at a low temperature (smoke temperature approximately 300 degrees Celsius, far lower than open flame combustion smoke generation methods). This significantly reduces the release of harmful components from the smoke-generating matrix, resulting in a significant improvement in product safety compared to traditional open flame combustion smoke-generating matrices. Microwave-heated non-combustible smoke-generating matrix products offer advantages such as rich flavor, mellow smoke, and no soot pollution.

[0020] Existing microwave-heated non-combustible smoke generators typically include a lithium battery, a DC-DC converter module, and a microwave amplification and heating module. The lithium battery serves as the energy source, outputting a DC voltage. The DC-DC converter module boosts the DC voltage from the lithium battery before outputting it. The DC voltage output from the DC-DC converter module drives the amplifier chip to output microwave energy to heat the smoke-generating substrate.

[0021] Due to the complex internal structure of DC-DC modules and the response speed of capacitive devices, adjusting the output duty cycle of a DC-DC module is much faster than adjusting its output voltage. Therefore, existing heating control methods typically use PWM waves to control the output duty cycle of the DC-DC module. Similarly, to meet different power output demands, current technologies usually set a high-power amplifier according to the peak power requirement, and modulate the duty cycle to control the temperature based on a fixed peak power heating level. Clearly, this method satisfies the heating power requirements at various stages, requires only duty cycle adjustment, and is simple in temperature control, making it the preferred method.

[0022] However, the inventors of this application discovered during the actual research and development process that the existing fixed peak power modulation duty cycle method has high energy consumption. Limited by the capacity of lithium batteries, the effective working time of microwave-heated non-combustible smoke appliances is significantly shortened.

[0023] It should be noted that the energy consumption comparison is based on the premise of achieving the same heating effect and outputting the same amount of energy, comparing the energy consumed by the entire microwave-heated non-combustible smoke appliance. The inventors of this application found that the high energy consumption is mainly due to the low energy conversion efficiency of the DC-DC module.

[0024] The structure of the microwave-heated non-combustible smoke set will be explained below.

[0025] In some embodiments, the smoking device includes a DC-DC module, a microwave amplification and heating module, and a control module; the control module is connected to the DC-DC module; and the DC-DC module is connected to the drain of the microwave amplification and heating module.

[0026] For example, the smoking device includes an energy storage module, a DC-DC converter module, a microwave amplification and heating module, a temperature measurement module, and a control module; the control module is connected to the DC-DC converter module; the DC-DC converter module is connected to the drain of the energy storage module and the microwave amplification and heating module.

[0027] Figure 1 This is an application scenario diagram of the control method for microwave heating smoke generators provided in an embodiment of the present invention. For example... Figure 1 As shown, for example, a microwave heating appliance includes: a lithium battery, a DC-DC module, an MCU, a comprehensive power chip, a microwave isolation circuit, a microwave heating amplification module, and a microwave transducer, etc.

[0028] For example, the microwave heating amplification module includes a low-voltage gallium nitride microwave energy chip.

[0029] For example, an adjustable output voltage DC / DC chip is used. The MCU's IO-1 controls the chip's EN pin to turn the chip on and off. The MCU's IO-2, IO-3, and IO-4 are converted into output voltage control signals for the DC / DC chip via a 3-to-8 decoder circuit and connected to the corresponding voltage step control pins. Different voltage outputs are achieved through different combinations of step voltage gating.

[0030] For example, the microwave energy chip outputs different power levels at different drain voltages to adjust the microwave irradiation intensity on the cigarette in the smoking device. For example, by achieving optimal matching between the input and output of the microwave energy chip, stable and efficient microwave energy conversion is achieved.

[0031] For example, the integrated power chip has dual output capabilities from lithium battery voltage up to +3.3V (Vcc) and -3.3V. By adjusting the proportional feedback loop resistance value of the negative voltage section, a desired stable gate voltage (e.g., Vgg = -1.5V) can be output. The drain of the microwave energy chip is controlled by the K1 power switch via the MCU's IO-5 pin. The +3.3V from the integrated power chip can be used as a power supply for the MCU and other logic circuits.

[0032] The microwave-heated cigarette device in this embodiment of the invention is powered by a lithium battery. The voltage of a single lithium battery is boosted to the drain voltage (e.g., 8V~12V) of the microwave energy chip through the boost section of the integrated power chip and DC-DC module. The energy from the lithium battery to the increased cigarette temperature undergoes two main conversions: lithium battery voltage boosting and electrical energy to microwave energy. The conversion efficiency from single-cell lithium battery voltage to drain voltage boosting is related to the drain voltage value. Figure 2 This is a schematic diagram of the boost output voltage and conversion efficiency curves of the DC-DC module provided in this embodiment of the invention; the vertical axis represents the conversion efficiency, and the horizontal axis represents the output voltage; see reference. Figure 2 In DC-DC conversion, the input voltage is constant, typically powered by a lithium battery. The smaller the voltage difference between the input and output terminals, the higher the conversion efficiency. This is mainly due to the non-ideals of the power transistor and the switching diode, such as the switching losses and conduction losses caused by the on-resistance Rds(on) of the power transistor and the diode voltage drop Vdiode.

[0033] The present invention addresses the problem of poor energy efficiency in the heating control method of existing microwave heating appliances by employing a combination of leakage voltage modulation and duty cycle modulation.

[0034] Figure 3 This is a flowchart illustrating the implementation of the control method for a microwave-heated smoke appliance provided in this embodiment of the invention; see also... Figure 3 This invention provides a method for controlling a microwave-heated smoke appliance, the method comprising: Step 301: Obtain the target smoke emission temperature of the target stage; the target stage can be any one of multiple heating stages; the target smoke emission temperatures of adjacent heating stages are different; Microwave-heated non-combustible smoking devices do not heat the cigarette at the same temperature throughout the entire process. Instead, based on the physical characteristics of the smoking agent's smoke generation and the release of effective substances from tobacco, as well as user experience requirements, the devices have multiple corresponding heating modes. Each heating mode is further divided into multiple continuous heating stages, which are performed sequentially.

[0035] The target stage can be any of the multiple heating stages: regardless of the current stage, subsequent temperature control logic needs to be executed. In other words, this control method applies to all heating stages, rather than targeting a specific stage.

[0036] In some embodiments, the heating stage includes, in chronological order, a preheating stage, a heat preservation stage, and an end stage.

[0037] Parameters for each heating stage may include the target smoke emission temperature and heating time. For example, the target smoke emission temperature may differ for each heating stage. For example, the target smoke emission temperature may differ for adjacent heating stages. The division of heating stages and temperature settings are generally determined based on the smoke emission characteristics of the smoking matrix, the release patterns of effective tobacco components, and user needs and experience.

[0038] In some embodiments, the target smoke temperature of the preheating stage is greater than the target smoke temperature of the final stage; the target smoke temperature of the final stage is greater than the target smoke temperature of the heat preservation stage.

[0039] It should be noted that the triggering conditions for the execution of this method may include: user power-on operation and user insertion of the smoke-generating matrix into the smoking device. In some embodiments, it may also include: the energy storage module's power level meeting the minimum heating requirement (e.g., power level ≥ 20%) to avoid heating interruption due to insufficient power and ensure the integrity of the heating process; the smoking device completing a self-test, such as the microwave amplification heating module and temperature measurement module being fault-free; after power-on, the device automatically detects the status of core components, and starts heating control after confirming there are no abnormalities. In addition, the user can also select a heating mode, such as standard mode, low temperature mode, and high temperature mode: different modes correspond to different heating stage parameters, and the control method is started based on the selected parameters after selecting the mode.

[0040] Step 302: Determine the corresponding target leakage pressure based on the target smoke emission temperature; wherein the target leakage pressure is not less than the leakage pressure corresponding to the minimum heating power required to reach the target smoke emission temperature.

[0041] For example, a microwave amplification heating module includes an amplifier with adjustable leakage voltage.

[0042] The output power of the microwave amplification heating module, i.e., the power used to heat the cigarette, is directly related to the leakage voltage of the DC-DC module: the higher the leakage voltage, the greater the power output of the microwave module. Under the same duty cycle, the leakage voltage determines the peak power output in a single cycle. The target leakage voltage is the DC-DC module output voltage reference set to ensure the microwave module can stably reach the target smoke emission temperature for that stage.

[0043] To reach the target smoking temperature, a minimum necessary heating power is required; below this power, the target temperature cannot be reached regardless of heating time. It's important to note that while smoking devices have some heat retention, heat loss still occurs. Furthermore, the user's smoking action exacerbates heat loss. Therefore, some of the heat generated raises the temperature of the smoking substrate, while some is lost as heat. For example, the minimum heating power can be determined experimentally or through theoretical calculations. Correspondingly, the minimum heating power corresponds to a specific leakage voltage, which can also be determined experimentally or through theoretical calculations. For instance, a minimum power of 10V leakage voltage is required to achieve a target temperature of 300℃.

[0044] Setting the target leakage pressure to be no less than the minimum leakage pressure serves two purposes: first, it provides a lower limit, ensuring the microwave module's power is sufficient to reach the target temperature and prevent heating failure due to insufficient leakage pressure; second, it controls the upper limit, preventing the target leakage pressure from becoming too high while still meeting the minimum requirement. If the leakage pressure is too high, the peak power output in a single cycle may far exceed the demand, even if the duty cycle is low and the temperature does not exceed the requirement, the excessively high output power will lead to lower energy conversion efficiency. The target leakage pressure can slightly exceed the minimum leakage pressure to allow for control margin. For example, the optimal approach is that the target leakage pressure equals the leakage pressure corresponding to the minimum heating power required to reach the target smoke emission temperature.

[0045] In one possible implementation, determining the corresponding target leakage pressure based on the target smoke emission temperature includes: Step 3021: Obtain a preset temperature-leakage pressure mapping table; the mapping table stores the correspondence between different target smoke emission temperatures and unique target leakage pressures; It should be noted that the mapping table is an empirical database established through extensive experiments and simulations before the smoking devices leave the factory. For example, for a target smoke generation temperature of 200℃, the heating effect under different leakage voltages was tested. It was found that a leakage voltage of 8V met the minimum power requirement, just enough to reach 200℃. Therefore, 200℃→8V was written into the mapping table. Each target temperature in the mapping table corresponds to a unique target leakage voltage, which is the optimal solution that meets the heating requirements and has the lowest energy consumption at that temperature.

[0046] Step 3022: Match the corresponding target leakage pressure in the mapping table according to the current target smoke emission temperature.

[0047] The implementation method of this invention simplifies the leakage pressure determination process and improves the efficiency of the control process by optimizing the preliminary experiments, solidifying the mapping table, and performing real-time table lookup matching, while ensuring that the target leakage pressure is not less than the minimum leakage pressure.

[0048] Step 303: Obtain the actual smoke emission temperature.

[0049] For example, the actual smoke temperature collected by the temperature measurement module is obtained.

[0050] The actual smoke generation temperature represents the true temperature state of the cigarette after heating. It can be the real-time temperature of the heated area of ​​the cigarette, such as the temperature of the smoke-generating matrix, the heating chamber, or the temperature of the contact points. If the actual smoke generation temperature is too high, it may cause localized scorching of the cigarette paper or tobacco, producing an irritating odor; if the actual smoke generation temperature is too low, the amount of smoke will be insufficient, failing to meet the user's smoking needs.

[0051] The temperature measurement module can be a thermocouple, thermistor, infrared temperature sensor, etc. The module can be installed close to the heated area of ​​the cigarette, such as the inner wall of the heating chamber or the side of the cigarette insertion channel. This ensures that the collected temperature accurately reflects the cigarette's smoking state, rather than the temperature of the equipment casing or other unrelated areas.

[0052] For example, the sampling frequency can be dynamically adjusted according to the needs of the heating stage. For instance, the preheating stage requires rapid temperature rise, so the sampling frequency can be set to 50Hz; the heat preservation and heating stage requires stable temperature control, so the frequency can be set to 10Hz, which ensures data real-time performance while avoiding excessive consumption of the control module's computing power.

[0053] For example, the temperature signal acquired by the temperature measurement module is an analog electrical signal. The control module periodically reads this analog electrical signal through a hardware interface, such as an ADC interface, converts it into a digital signal, stores it in a buffer as the actual smoke temperature, and uses it for subsequent comparison with the target smoke temperature.

[0054] Step 304: Control the DCDC module to output the target leakage pressure, and use the target smoke emission temperature as the temperature control target to control the output duty cycle of the DCDC module and adjust the actual smoke emission temperature.

[0055] The target leakage voltage is the minimum necessary voltage reference determined in step 302 to meet the heating requirements of this stage, for example, a target leakage voltage of 12V for the preheating stage. The DC-DC module outputs this leakage voltage to provide a stable power output capability for the microwave amplification heating module. This ensures the equipment can reach the target smoke emission temperature and avoids insufficient heating power due to insufficient voltage.

[0056] For example, if the target drain voltage is set to 12V, the DC-DC module will stably output a 12V voltage to the drain of the microwave module. At this time, the upper limit of the microwave module's power output is determined by 12V, which serves as the basis for subsequent duty cycle modulation.

[0057] Duty cycle refers to the percentage of time within a cycle that the DC-DC module outputs the target leakage voltage. For example, it can be controlled by... Figure 1 The K1 switch in the circuit implements this. The duty cycle directly determines the average output power per unit time: the higher the duty cycle, the greater the average power and the stronger the heating capacity; conversely, the lower the duty cycle, the weaker the heating capacity. For example, the duty cycle ranges from 20% to 100%.

[0058] The control module compares the actual smoke temperature obtained in step 303 with the target smoke temperature and adjusts the duty cycle to achieve temperature correction. For example, if the actual temperature is less than the target temperature (e.g., actual 280℃, target 300℃), the duty cycle is increased (e.g., from 50% to 70%) to increase energy output per unit time and accelerate temperature rise. If the actual temperature is greater than the target temperature (e.g., actual 320℃, target 300℃), the duty cycle is decreased (e.g., from 50% to 30%) to reduce energy output and suppress temperature rise. If the actual temperature is approximately equal to the target temperature, the duty cycle is kept constant to maintain temperature stability.

[0059] The embodiments of the present invention employ a combination of leakage voltage modulation and duty cycle modulation, which avoids the problem of low energy conversion efficiency caused by fixed power output, and has higher responsiveness and more efficient control process than frequent leakage voltage adjustment.

[0060] In one possible implementation, controlling the output duty cycle of the DC-DC module and adjusting the actual smoke temperature with the target smoke temperature as the temperature control target includes: calculating the difference between the actual smoke temperature and the target smoke temperature; and adjusting the output duty cycle of the DC-DC module using a PID algorithm based on the difference, so that the actual smoke temperature converges to the target smoke temperature.

[0061] The PID algorithm determines the duty cycle adjustment amount through the coordinated calculation of three components: proportional (P), integral (I), and derivative (D). This solves the problems of overshoot, oscillation, and regulation lag that may occur with simple step-by-step duty cycle adjustment. Convergence means that the actual temperature gradually approaches and stabilizes near the target temperature through PID control, for example, within ±3℃, rather than fluctuating significantly around the target value.

[0062] Compared to simple linear step-by-step adjustment of the duty cycle, the PID algorithm in this invention can balance adjustment speed, stability, and accuracy, effectively avoiding problems such as temperature overshoot, oscillation, and adjustment lag. It ensures that the cigarette temperature remains stable at the target smoking temperature during microwave heating, guaranteeing both the consistency of smoke volume and flavor, and reducing additional energy consumption caused by temperature fluctuations.

[0063] This invention, in its embodiments, determines the minimum heating power and corresponding target leakage voltage required to meet heating demands at each of the multiple heating stages with different smoke emission temperatures, based on the target smoke emission temperature. Using the target leakage voltage as a benchmark, the actual output power is dynamically adjusted via duty cycle to compensate for temperature fluctuations in real time. The peak power of the dynamic target leakage voltage output by the DCDC module at each stage only ensures that the heating demand of that stage is met, avoiding continuous high-power operation and a decrease in DCDC output voltage. Therefore, the input-output voltage difference of the DCDC module is reduced, energy conversion efficiency is improved, and the heating energy efficiency of the microwave-heated non-combustible smoke appliance is enhanced.

[0064] In one possible implementation, after step 304, the process further includes: when a preset switching condition is met, the current heating stage ends, and the process switches to the adjacent heating stage. The new heating stage continues to be controlled by the control logic of steps 301-304.

[0065] For example, the switching condition between adjacent heating stages can be: the heating duration of the current stage reaches a preset duration. That is, a preset heating duration is set for each stage, and the process switches to the next heating stage when the preset duration is reached. Other switching conditions are described below.

[0066] In some embodiments, the switching conditions for adjacent heating stages include at least one of the following: the duration for which the actual smoke temperature maintains the target smoke temperature reaches a preset threshold, the number of times the user takes a puff reaches a preset number, or the remaining power is lower than a preset power.

[0067] It should be noted that Method 1, where the actual smoke temperature is maintained at the target smoke temperature for a preset threshold duration, is a phase switching based on temperature stability. One of the core objectives of each heating phase is to stabilize the temperature at the target value, and maintaining the target duration means that the heating in this phase ensures the uniform release of effective components from the smoke matrix.

[0068] Method 2: The system switches between stages based on user behavior after a preset number of puffs. The core of microwave-heated non-combustible tobacco devices is matching the user's puffing habits; the number of puffs directly reflects the user's usage progress. For example, the heating / keeping-warming stage is set to support a maximum of 12 puffs. Each time a user puff is detected, the number of puffs is recorded. When 12 puffs are reached, it indicates the user is nearing completion, and the system automatically switches from the heating / keeping-warming stage to the cooling stage to prevent the remaining tobacco from burning due to continuous heating.

[0069] Method 3: Switching between stages based on the device's energy status when the remaining power of the energy storage module falls below a preset level. The energy storage module's power directly determines whether the device can complete the entire heating process, and power protection prevents power outages. For example, setting a switching threshold of 15% remaining power, if the power level drops below 15% during the heat preservation and heating stage, it indicates that the remaining power may be insufficient to support the complete heat preservation and heating stage. In this case, the heat preservation and heating stage is terminated early, and a low power reminder is issued to prevent customers from waiting for extended periods or to avoid a deterioration in the taste of the smoke-generating matrix, thus avoiding a poor user experience. These switching conditions can be used individually or in combination.

[0070] The technical concept of the present invention is illustrated below with a comprehensive embodiment.

[0071] This invention relates to microwave-heated non-combustible smoke devices. Its core component is a microwave power source based on third-generation gallium nitride semiconductor technology. The microwave power source is powered by a lithium battery within the device. Through a low-leakage-voltage gallium nitride microwave energy chip with optimized technology, microwave energy output is achieved, converting the lithium battery's electrical energy into microwave energy. The microwave energy forms a uniform electromagnetic energy field in the resonant cavity via a transducer. The electromagnetic waves can uniformly penetrate the smoke-generating matrix, causing the polar molecules within to rotate and align. This molecular reversal leads to intermolecular friction and heating, further stimulating the release of effective substances from the smoke-generating matrix to enhance the user experience.

[0072] The gallium nitride microwave energy chip in this invention requires an externally supplied gate voltage (Vgg, negative voltage) and drain voltage (Vdd, positive voltage). By optimizing the circuit parameters, the microwave energy chip can output microwave energy signals in the ISM band (2.4GHz), with a power conversion efficiency of over 70%.

[0073] The gallium nitride (GaN) microwave energy chip in this invention supports a wide drain voltage range and maintains high power efficiency through optimized matching. In microwave-heated non-combustible smoke appliances, using a high drain voltage places high demands on the conversion efficiency of the power supply boost system, posing significant technical challenges and resulting in poor economic efficiency. The microwave energy chip in this invention employs an optimized low-voltage GaN process, supporting drain voltages down to 8V while still outputting 7W of microwave energy. This significantly reduces the technical difficulty of the drain power supply system and provides high conversion efficiency, substantially improving the product's cost-effectiveness. The GaN energy chip has a negative gate voltage; during the power-on sequence, the gate voltage must be applied before the drain voltage, and during the power-off sequence, the drain voltage must be de-energized before the gate voltage. This results in two control methods for the microwave energy chip: gate control and drain control. In gate-controlled mode, the drain power supply is constantly supplied. A lower negative voltage is used to pinch off the gate of the microwave power chip, causing the depletion layer to diffuse into the channel. The current path is cut off, and the chip does not operate. When the gate voltage returns to the preset static operating point voltage, the channel conducts, the current path is established, and the chip resumes normal operation. In drain-controlled mode, the gate voltage is constantly supplied. The microwave power source is turned on and off by controlling the drain power switch.

[0074] This invention employs dynamic leakage voltage to achieve different microwave power output levels for the microwave energy chip. During the heating process of cigarettes in microwave-heated non-combustible tobacco devices, the effective substances in the cigarette are contained within the tobacco shreds. Influenced by the cigarette manufacturing process and the different usage habits requiring varying concentrations of effective substances in the smoke and the smoke-generating matrix, the output energy of the microwave power chip needs to be adjusted. Under stronger microwave irradiation, the enhanced electromagnetic field energy increases the flipping ability of weakly polar molecules in the electromagnetic field, improving orientation consistency. This increased molecular orientation simultaneously increases the frictional scale of molecular vibration and flipping. This intermolecular friction not only raises the temperature but also accelerates the activation and release of effective substances in the smoke-generating matrix. Therefore, increasing microwave energy can shorten preheating time and increase the release concentration of effective substances in the smoke and smoke-generating matrix, resulting in a richer flavor; decreasing microwave energy can slow down the release concentration of effective substances in the smoke and smoke-generating matrix, resulting in a milder flavor.

[0075] The embodiments of this invention use a PWM wave, a fixed-period signal, to control the microwave source output by adjusting the duty cycle within the period, thus achieving controllable output of the microwave energy chip. However, even with a 100% duty cycle, the microwave irradiation energy cannot be increased, indicating an upper limit bottleneck. Dynamic leakage voltage modulation technology can achieve flexible control of microwave irradiation energy intensity, and combined with PWM wave duty cycle control, it can control the microwave irradiation duration of cigarettes. With the support of MCU algorithms, through the dual effects of absolute irradiation intensity and irradiation duration, it can meet the needs of a wider range of application scenarios, enriching, improving, and optimizing the heating mode of microwave-heated non-combustible tobacco devices.

[0076] This invention employs a microwave-heated non-combustible smoke device that combines dynamic leakage voltage and PWM modulation. Figure 4 This is a schematic diagram of the control strategy and temperature curve provided in an embodiment of the present invention. (Refer to...) Figure 4 A typical operating mode is as follows: assuming the optimal smoke point temperature for a certain type of heated tobacco product is 300℃, and the first puff requires the highest output concentration, the 210-second heating time can be divided into four stages. The first preheating stage lasts 5 seconds. The MCU uses a 3-8 decoding unit to set the 6P4V1, 3P2V, 1P6V, 0P8V, and EN pins of the DC-DC chip. The DC-DC chip outputs 12V. Under 12V conditions, the microwave energy chip outputs 10.5W. A 95% duty cycle signal is output through the MCU's IO5 pin to achieve PWM wave modulation. During this stage, the microwave energy chip outputs energy...

[0077] The heated tobacco product received 49.875 joules of microwave energy during the preheating stage, reaching a temperature of 280°C, with an average of 9.975 joules per second.

[0078] The preheating phase 2 lasts for 5 seconds. During this phase, the MCU adjusts the duty cycle of the PWM signal (20%~95%) based on the temperature collected by the ADC, gradually increasing the cigarette temperature and controlling it to 320℃. This promotes the release and concentration accumulation of effective components in the smoke-generating matrix. At 10 seconds, an indication signal is output via IO-7 indicating that it is ready to be inhaled. During this phase, the PWM wave parameters are dynamically modulated. Calculated based on an average duty cycle of 65%, the microwave energy chip outputs 34.125 joules of energy during this phase, averaging 6.825 joules per second.

[0079] The heat preservation phase lasts for 170 seconds. During this phase, the MCU sets the 6P4V1, 1P6V, and EN pins of the DC-DC chip through the 3-8 decoding unit, causing the DC-DC chip to output 8V. Under 8V conditions, the output power of the microwave energy chip is 7.2W. Due to the cooling caused by continuous suction and natural heat dissipation, the MCU uses the temperature collected in real time by the ADC to modulate the PWM parameters (duty cycle between 20% and 95%) to maintain the cigarette's continuous smoking temperature of 300℃. Calculated based on an average duty cycle of 60%, the output energy of the microwave energy chip during this phase is 777.6 joules, averaging 4.57 joules per second.

[0080] The final stage lasts 30 seconds. During this stage, since most of the effective components of the cigarette have been released, the temperature is controlled at 315℃ to further stimulate the release of the remaining effective components, increase the concentration, and prevent scorching caused by overheating of the tobacco matrix. During this stage, the MCU sets the 6P4V1, 3P2V, 0P4V, and EN pins of the DC-DC chip through the 3-8 decoding unit. The DC-DC chip outputs 10V. Under 10V conditions, the output power of the microwave energy chip is 9.5W. Based on a 60% average duty cycle, the microwave energy chip outputs 171 joules in this stage, averaging 5.7 joules per second.

[0081] Traditional microwave-heated non-combustible tobacco devices use fixed microwave conversion energy and rely solely on PWM wave control of the duty cycle for heating. This creates a bottleneck in microwave energy, limiting the release rate of smoke and active ingredients from cigarettes, restricting heating modes, and resulting in a less complex flavor profile, thus failing to fully leverage the advantages of microwave-heated non-combustible tobacco devices. For example, traditional microwave-heated non-combustible tobacco devices using only PWM parameter modulation have a fixed leakage voltage, resulting in a fixed output power of the microwave energy chip. For instance, at an 8V leakage voltage, it outputs 7.2W of microwave energy. Figure 4 The process involves dividing the cigarette into stages. In both the preheating stage 1 and preheating stage 2, a 95% duty cycle is used so that the cigarette can obtain an average energy of 6.84 joules. This is not conducive to modulating the release ratio of the effective components of the smoke-generating matrix in the first puff.

[0082] The embodiments of the present invention achieve controllable microwave output power levels by controlling the drain voltage amplitude of the microwave energy chip.Figure 5 This is a schematic diagram of the leakage voltage and output power curves of the microwave energy chip provided in an embodiment of the present invention. The leakage voltage and output power are positively correlated. (Refer to...) Figure 5 With a leakage voltage between 8V and 12V, it can achieve a microwave energy output level of 7W to 10W. Figure 6 This is a schematic diagram of the leakage voltage and microwave conversion efficiency curves of the microwave energy chip provided in an embodiment of the present invention. (Refer to...) Figure 6 By optimizing the input and output matching of the microwave energy chip, a microwave conversion efficiency of over 70% is maintained within a wide voltage range of 8V to 12V.

[0083] This invention relates to microwave-heated non-combustible tobacco devices. Based on a microwave energy chip, a comprehensive power supply chip, and a DC / DC chip with dynamic voltage output, it achieves dynamic control of the output microwave energy power of the microwave energy chip through MCU algorithm control. This invention utilizes the wide drain voltage support capability of the gallium nitride-based microwave energy chip and optimizes the matching of the input and output stages to achieve high microwave energy conversion efficiency over a wide drain voltage range. Through dynamic control of microwave energy power combined with PWM control using an MCU algorithm, this invention enables adjustment of the preheating time and the release curves of smoke and effective substances in the microwave-heated non-combustible tobacco device, resulting in richer heating modes and optimized release curves and flavor adjustments for cigarettes.

[0084] This invention proposes a dynamic drain voltage modulation design method based on a gallium nitride microwave energy chip. By controlling the drain voltage of the microwave energy chip, different output power levels can be achieved. Under the algorithm control of an MCU (microprocessor) and combined with the PWM signal control of the on-time, the cigarette achieves a dual effect of microwave energy intensity and irradiation duration. This greatly improves the usage mode of microwave-heated non-combustible tobacco devices, enhances the device's ability to control the release rate of effective substances from the smoke-generating matrix, and thus enriches the usage mode of tobacco devices and meets users' changing taste preferences.

[0085] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0086] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0087] Figure 7A schematic diagram of the control device for a microwave-heated smoke appliance provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below: The smoke appliance includes a DC-DC module, a microwave amplification and heating module, and a control module; the control module is connected to the DC-DC module; the DC-DC module is connected to the drain of the microwave amplification and heating module; a control device 7 for a microwave-heated smoke appliance includes: The target temperature acquisition module 71 is used to acquire the target smoke temperature of the target stage; the target stage can be any one of multiple heating stages; the target smoke temperatures of adjacent heating stages are different; The target leakage pressure determination module 72 is used to determine the corresponding target leakage pressure based on the target smoke emission temperature; wherein the target leakage pressure is not less than the leakage pressure corresponding to the minimum heating power required to reach the target smoke emission temperature; The actual temperature acquisition module 73 is used to acquire the actual smoke emission temperature; The control module 74 is used to control the output target leakage pressure of the DCDC module, and to control the output duty cycle of the DCDC module and adjust the actual smoke temperature with the target smoke temperature as the temperature control target.

[0088] Figure 8 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. For example... Figure 8 As shown, the electronic device 8 of this embodiment includes a processor 80 and a memory 81. The memory 81 stores a computer program 82. When the processor 80 executes the computer program 82, it implements the steps in the various method embodiments described above. Alternatively, when the processor 80 executes the computer program 82, it implements the functions of each module / unit in the various device embodiments described above.

[0089] For example, computer program 82 may be divided into one or more modules / units, which are stored in memory 81 and executed by processor 80 to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of computer program 82 in electronic device 8.

[0090] Electronic device 8 may include, but is not limited to, processor 80 and memory 81. Those skilled in the art will understand that... Figure 8 This is merely an example of electronic device 8 and does not constitute a limitation on electronic device 8. It may include more or fewer components than shown, or combine certain components, or different components. For example, electronic device 8 may also include input / output devices, network access devices, buses, etc.

[0091] The processor 80 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0092] The memory 81 can be an internal storage unit of the electronic device 8, such as a hard disk or RAM. The memory 81 can also be an external storage device of the electronic device 8, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory 81 can include both internal and external storage units of the electronic device 8. The memory 81 is used to store the computer program 82 and other programs and data required by the electronic device 8. The memory 81 can also be used to temporarily store data that has been output or will be output.

[0093] For the sake of simplicity and clarity, only the above-described functional modules / units are used as examples. In practical applications, the functions described above can be assigned to different functional modules / units as needed. These modules / units can be implemented in hardware, software, or a combination of both.

[0094] This invention also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the methods described in the above-described method embodiments.

[0095] This invention also provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the methods described in the above-described method embodiments.

[0096] Computer programs include computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0097] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not detailed or described in a particular embodiment can be referred to in the relevant descriptions of other embodiments. Unless otherwise specified or in conflict with logic, the terminology and / or descriptions between different embodiments are consistent and can be referenced interchangeably. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0098] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A control method for a microwave heating smoke appliance, characterized in that, The smoking device includes a DC-DC module, a microwave amplification and heating module, and a control module; the control module is connected to the DC-DC module; the DC-DC module is connected to the drain of the microwave amplification and heating module; the method includes: Obtain the target smoke emission temperature for the target stage; the target stage can be any one of multiple heating stages; the target smoke emission temperatures of adjacent heating stages are different; The target leakage pressure is determined based on the target smoke emission temperature; wherein the target leakage pressure is not less than the leakage pressure corresponding to the minimum heating power required to reach the target smoke emission temperature. Obtain the actual smoke emission temperature; The DC-DC module outputs a target leakage pressure, and the DC-DC module output duty cycle is controlled and the actual smoke temperature is adjusted with the target smoke emission temperature as the temperature control target.

2. The control method for microwave heating smoke generators according to claim 1, characterized in that, The switching conditions for adjacent heating stages include at least one of the following: the actual smoke temperature maintains the target smoke temperature for a preset threshold duration, the user takes a preset number of puffs, or the remaining battery power is lower than a preset battery power.

3. The control method for microwave heating smoke generators according to claim 1, characterized in that, The heating stages, in chronological order, include a preheating stage, a heat preservation stage, and a final stage.

4. The control method for microwave heating smoke generators according to claim 3, characterized in that, The target smoke temperature in the preheating stage is greater than the target smoke temperature in the final stage; The target smoke temperature in the final stage is greater than the target smoke temperature in the heat preservation stage.

5. The control method for microwave heating smoke generators according to claim 1, characterized in that, The duty cycle ranges from 1% to 100%.

6. The control method for microwave heating smoke generators according to claim 1, characterized in that, The step of determining the corresponding target leakage pressure based on the target smoke emission temperature includes: Obtain a preset temperature-leakage pressure mapping table; the mapping table stores the correspondence between different target smoke emission temperatures and a unique target leakage pressure; Based on the current target smoke emission temperature, the corresponding target leakage pressure is matched in the mapping table.

7. The control method for microwave heating smoke generators according to claim 1, characterized in that, The method of controlling the output duty cycle of the DC-DC module and adjusting the actual smoke temperature, with the target smoke temperature as the temperature control target, includes: Calculate the difference between the actual smoke temperature and the target smoke temperature; Based on the difference, the output duty cycle of the DC-DC module is adjusted using a PID algorithm to make the actual smoke temperature converge toward the target smoke temperature.

8. A control device for a microwave heating smoke set, characterized in that, The smoking device includes a DC-DC module, a microwave amplification and heating module, and a control module; the control module is connected to the DC-DC module; the DC-DC module is connected to the drain of the microwave amplification and heating module; the device includes: The target temperature acquisition module is used to acquire the target smoke temperature of the target stage; the target stage can be any one of multiple heating stages; the target smoke temperatures of adjacent heating stages are different; The target leakage pressure determination module is used to determine the corresponding target leakage pressure based on the target smoke emission temperature; wherein, the target leakage pressure is not less than the leakage pressure corresponding to the minimum heating power required to reach the target smoke emission temperature; The actual temperature acquisition module is used to acquire the actual smoke emission temperature; The control module is used to control the output target leakage pressure of the DC-DC module, and to control the output duty cycle of the DC-DC module and adjust the actual smoke temperature with the target smoke temperature as the temperature control target.

9. An electronic device, characterized in that, It includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the control method for the microwave heating smoke appliance as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the control method for a microwave heating smoke appliance as described in any one of claims 1 to 7.

Images