Electronic cigarette heating noise suppression method, readable storage medium and circuit

Abstract

The invention provides an electronic cigarette heating noise suppression method, a readable storage medium and a circuit, and the method comprises the steps: generating a carrier signal with a first carrier frequency and a duty ratio being a current carrier duty ratio based on a battery voltage, and calculating a current fundamental wave duty ratio of a fundamental wave signal; a fundamental wave signal is generated, the carrier signal is modulated based on the fundamental wave signal, a high-frequency voltage control signal is obtained, and the first fundamental wave frequency is smaller than the first carrier frequency; and modulating the battery voltage to obtain a high-frequency voltage signal of which the average value is a target voltage value, and controlling a heating wire to heat under the high-frequency voltage signal. The low-frequency signal is used as the fundamental wave signal to modulate the high-frequency signal as the carrier wave signal, so that the overall frequency is larger than the frequency range capable of being collected by human ears, and the circuit noise generated when the electronic cigarette works is reduced.

Description

Technical Field

[0001] This invention relates to the field of electronic cigarette heating technology, and more particularly to a method for suppressing noise during electronic cigarette heating, a readable storage medium, and a circuit. Background Technology

[0002] Electronic cigarettes are a type of consumer product designed to deliver nicotine to the lungs. Their main structure includes a heating wire as an atomizer and a battery assembly. The atomizer rapidly vaporizes e-liquid by heating, thereby simulating the sensory experience of smoking by quickly delivering enough nicotine to the consumer.

[0003] Current electronic cigarettes are primarily powered by lithium batteries. As the lithium battery gradually discharges, its output voltage decreases. Therefore, existing technologies mainly use output control switches to modulate the voltage signal with pulse width modulation (PWM). When the lithium battery output voltage drops, the duty cycle of the output signal is increased accordingly, thus ensuring that the average value of the voltage signal output to the atomizer heating coil remains stable. However, in existing technologies, to ensure sufficient atomization of the e-liquid, the frequency of the voltage modulation signal is relatively low. This causes the switching frequency to enter the audible range during actual operation, generating circuit noise.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a method for suppressing heating noise in electronic cigarettes, a readable storage medium and circuit, thereby solving the problem that existing electronic cigarettes cannot maintain the flavor of atomized smoke while suppressing heating noise.

[0006] The technical solution of the present invention is as follows: In a first aspect, the present invention provides a method for suppressing heating noise in electronic cigarettes, the steps of which include: Obtain the battery voltage and target voltage values, and generate a carrier signal with a first carrier frequency and a duty cycle equal to the current carrier duty cycle based on the battery voltage; The current fundamental duty cycle of the fundamental signal is calculated based on the carrier signal; A fundamental wave signal with a first fundamental wave frequency and a duty cycle equal to the current fundamental wave duty cycle is generated, and a carrier signal is modulated based on the fundamental wave signal with the current fundamental wave duty cycle to obtain a high-frequency voltage control signal, wherein the first fundamental wave frequency is less than the first carrier frequency. The battery voltage is modulated according to the high-frequency voltage control signal to obtain a high-frequency voltage signal with an average value of the target voltage value, and the heating wire is controlled to heat under the high-frequency voltage signal. The high-frequency voltage control signal is adjusted according to the battery voltage to keep the average value of the high-frequency voltage signal at the target voltage value.

[0007] A further provision of the present invention includes the step of adjusting the high-frequency voltage control signal according to the battery voltage to maintain the average value of the high-frequency voltage signal at a target voltage value, comprising: Every so often, the battery voltage, the current fundamental frequency duty cycle of the fundamental signal, and the current carrier duty cycle of the carrier signal are reacquired. If the fundamental frequency duty cycle is less than 100%, a corrected fundamental frequency duty cycle is calculated based on the battery voltage and the current carrier duty cycle, and the corrected fundamental frequency duty cycle is used as the current fundamental frequency duty cycle; If the fundamental duty cycle is equal to 100%, the corrected carrier duty cycle is calculated based on the battery voltage, and the corrected carrier duty cycle is used as the current carrier duty cycle; The corrected high-frequency voltage control signal is obtained by modulating the carrier signal with the duty cycle of the carrier signal using the fundamental signal with the duty cycle of the fundamental signal.

[0008] A further provision of the present invention includes the step of calculating the current fundamental duty cycle of the fundamental signal based on the carrier signal, comprising: Acquire the carrier signal and target voltage value; The average carrier value is calculated based on the carrier signal, and the average carrier value is the average voltage value of the carrier signal; The current fundamental frequency duty cycle of the fundamental signal is calculated based on the average carrier frequency, the target voltage value, and the current carrier duty cycle.

[0009] In a further embodiment of the present invention, the step of acquiring the battery voltage and the target voltage value, and generating a carrier signal with a first carrier frequency and a duty cycle equal to the current carrier duty cycle based on the battery voltage includes: Read the pre-stored first carrier frequency, current carrier duty cycle, battery voltage, and target voltage value; The first carrier frequency and the current carrier duty cycle are input into a timer, and a carrier signal with the first carrier frequency and the current carrier duty cycle is obtained by counting with the timer.

[0010] In a further embodiment of the present invention, the step of generating a fundamental signal with a first fundamental frequency and a duty cycle equal to the current fundamental frequency, and modulating a carrier signal based on the fundamental signal with the current fundamental frequency to obtain a high-frequency voltage control signal, wherein the first fundamental frequency is less than the first carrier frequency, includes: The PWM module generates a fundamental signal with a frequency of the first fundamental frequency and a duty cycle of the current fundamental frequency. The carrier signal is loaded onto the PWM module, and the carrier signal on the PWM module is modulated by the fundamental signal to obtain a high-frequency voltage control signal.

[0011] In a further embodiment of the present invention, in the step of calculating a corrected fundamental frequency duty cycle based on the battery voltage and the current carrier duty cycle if the fundamental frequency duty cycle is less than 100%, and using the corrected fundamental frequency duty cycle as the current fundamental frequency duty cycle, the current carrier duty cycle of the carrier signal is greater than or equal to 90% and less than or equal to 95%.

[0012] In a further embodiment of the present invention, the first carrier frequency is greater than or equal to 20kHz, the first carrier frequency is greater than or equal to the frequency at which the human ear receives sound, and the first fundamental frequency is 100Hz.

[0013] Secondly, the present invention provides a readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the above-described method for suppressing heating noise in electronic cigarettes.

[0014] Thirdly, the present invention also provides an electronic cigarette heating noise suppression circuit, which includes: a microcontroller unit, an output switch module, and a heating wire; wherein, The signal control terminal of the microcontroller is connected to the control terminal of the output switch module, and the detection terminal of the microcontroller is connected to the second connection terminal of the output switch module; it is used to obtain the battery voltage through the detection terminal and output a high-frequency voltage signal to the output switch module to realize the electronic cigarette heating noise suppression method described above. The first connection terminal of the output switch module is connected to the battery voltage, and the second connection terminal of the output switch module is connected to the heating wire, which is used to modulate the battery voltage based on the high-frequency voltage control signal; The heating wire is heated according to the high-frequency voltage signal.

[0015] In a further embodiment of the present invention, the microcontroller unit includes a memory, a processor, a timer, and a PWM module; wherein, the memory is used to store a computer program that can be run on the processor and to store a predetermined target voltage value; the processor is connected to the memory and is used to calculate the current fundamental duty cycle, the current carrier duty cycle, and the carrier average value; the timer is connected to both the processor and the PWM module and is used to generate a carrier signal with a duty cycle equal to the current carrier duty cycle and output it to the PWM module; The PWM module is connected to the output switch module and is used to generate a fundamental signal with a duty cycle equal to the current fundamental duty cycle, modulate the carrier signal according to the fundamental signal, and output the high-frequency voltage control signal to the output switch module.

[0016] This invention provides a method for suppressing heating noise in electronic cigarettes, a readable storage medium, and a circuit. The method includes the following steps: acquiring a battery voltage and a target voltage value; generating a carrier signal with a first carrier frequency and a duty cycle equal to the current carrier duty cycle based on the battery voltage; calculating the current fundamental duty cycle of a fundamental signal based on the carrier signal; generating a fundamental signal with a first fundamental frequency and a duty cycle equal to the current fundamental duty cycle; modulating the carrier signal based on the fundamental signal with the current fundamental duty cycle to obtain a high-frequency voltage control signal, wherein the first fundamental frequency is less than the first carrier frequency; modulating the battery voltage according to the high-frequency voltage control signal to obtain a high-frequency voltage signal with an average value equal to the target voltage value; controlling the heating wire to heat under the high-frequency voltage signal; and adjusting the high-frequency voltage control signal according to the battery voltage to maintain the average value of the high-frequency voltage signal at the target voltage value. This invention uses a low-frequency signal as the fundamental signal to modulate a high-frequency signal as the carrier signal, thereby making the overall frequency greater than the frequency range that the human ear can detect, thus reducing circuit noise during electronic cigarette operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a flowchart of the steps of an electronic cigarette heating noise suppression method in this invention.

[0019] Figure 2 This is a circuit diagram of the electronic cigarette heating noise suppression circuit in this invention.

[0020] Figure 3 This is a voltage waveform diagram of the high-frequency voltage signal when the electronic cigarette heating noise suppression circuit of this invention is working.

[0021] The labels in the attached diagram are: 100, microcontroller unit; 200, output switch module. Detailed Implementation

[0022] This invention provides a method for suppressing heating noise in electronic cigarettes, a readable storage medium, and a circuit. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of the present invention involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0024] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0025] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0026] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0027] The inventors discovered that current atomization control products are powered by lithium batteries. As the battery voltage decreases, the duty cycle of the output control MOS continuously increases until it reaches 100%. Current technology requires increasing the frequency of the heating coil to over 20kHz, exceeding the range audible to the human ear, to address noise issues. However, at this frequency, the desired vapor flavor is not achieved because the heating coil's output power needs to be maintained at a constant level. When using high-frequency signals, the macroscopic duty cycle of the switching signal is fixed; a higher frequency results in a shorter high-level output time per waveform, thus reducing the overall heating and atomization time of the e-liquid within the PWM cycle. This leads to excessively short effective heating pulses, preventing the heating coil from reaching the ideal temperature in each cycle, resulting in a thin vapor and insufficient burst power. Conversely, if control is applied at a frequency below 20kHz, the heating time is sufficient to achieve the desired vapor flavor. However, at this frequency, the switching frequency falls within the audible sound range, causing buzzing and whistling noises in the electronic cigarette's circuitry, negatively impacting the user experience.

[0028] To solve the above technical problems, such as Figure 1 As shown, the present invention provides a method for suppressing heating noise in electronic cigarettes, the steps of which include: S100: Obtain the battery voltage and target voltage value, and generate a carrier signal with a first carrier frequency and a duty cycle equal to the current carrier duty cycle based on the battery voltage; Specifically, the maximum battery voltage of the selected lithium battery is greater than the rated operating voltage of the heating wire. The average value of the voltage signal output to the heating wire is adjusted by adjusting the duty cycle of its control signal to keep the average value constant. The duty cycle and frequency of the carrier signal selected when the electronic cigarette starts working are predetermined; that is, the initial values ​​of the current carrier duty cycle and the first carrier frequency can be predetermined before the electronic cigarette starts working.

[0029] In some preferred embodiments, the step of acquiring the battery voltage and target voltage value, and generating a carrier signal with a first carrier frequency and a duty cycle equal to the current carrier duty cycle based on the battery voltage includes: S110: Read the pre-stored first carrier frequency, current carrier duty cycle, battery voltage, and target voltage value; S120. Input the first carrier frequency and the current carrier duty cycle into the timer, and obtain a carrier signal with the first carrier frequency and the current carrier duty cycle by counting with the timer.

[0030] Specifically, the timer can be a timer installed inside the microcontroller chip or microcontroller module, or an external timer. Preferably, the timer is installed inside the microcontroller chip. The duty cycle and frequency data of the timer's output level can be set by software program. Specifically, the timer can count the internal clock, and trigger a change in the output level when the count value reaches a set threshold. Thus, the period and duty cycle can be adjusted by adjusting the counting threshold and trigger mode.

[0031] S200. Calculate the current fundamental duty cycle of the fundamental signal based on the carrier signal; Since the carrier signal is predetermined before the electronic cigarette starts operating, and the battery voltage and the operating power and voltage of the heating wire are known, the target voltage value is also known. Therefore, the current fundamental duty cycle can be directly calculated using the carrier signal and the target voltage value.

[0032] Specifically, the step of calculating the current fundamental duty cycle of the fundamental signal based on the carrier signal includes: S210, Obtain the carrier signal and target voltage value; S220. Calculate the average value of the carrier signal based on the carrier signal, wherein the average value of the carrier signal is the average voltage value of the carrier signal; S230. Calculate the current fundamental frequency duty cycle of the fundamental signal based on the carrier average value, the target voltage value, and the current carrier duty cycle.

[0033] For example, the voltage waveform of a high-frequency voltage signal is as follows: Figure 3 As shown, the fundamental wave signal and the carrier signal are both square wave signals. Figure 3 The area within the red box represents a single period T of the fundamental wave signal. Each peak indicated by arrow A represents a high-level position of a single period of the carrier signal after modulation. When the fundamental wave signal is high, the carrier signal is output. Arrow B indicates a low-level position for the fundamental wave signal output; at this time, the carrier signal stops outputting, and the high-frequency voltage signal is generally low. The high-frequency voltage signal is obtained as the output by DC chopping the battery voltage. Therefore, the current fundamental wave duty cycle can be obtained based on the current carrier duty cycle, battery voltage, and target voltage value. The average voltage value Vout1 of the carrier signal is:

[0034] Among them, V B+Let D1 be the battery voltage, and D1 be the duty cycle of the carrier signal, i.e., the current carrier duty cycle. This allows us to obtain the average value of the output voltage signal when modulated using the carrier signal. Based on this, the fundamental voltage further modulates the carrier signal, resulting in the average voltage Vout2 of the modulated control signal:

[0035] Where D2 is the duty cycle of the fundamental wave signal. Therefore, when the current carrier duty cycle, battery voltage, and target voltage value are determined, the current fundamental wave duty cycle can be derived by using the target voltage value as the equivalent voltage of the modulated control signal.

[0036] S300. Generate a fundamental signal with a first fundamental frequency and a duty cycle equal to the current fundamental frequency, and modulate the carrier signal based on the fundamental signal with the current fundamental frequency to obtain a high-frequency voltage control signal, wherein the first fundamental frequency is less than the first carrier frequency. Specifically, the fundamental signal uses a low-frequency signal to modulate the carrier signal. Under the same target voltage value, compared to directly using a high-frequency signal for modulation, the carrier signal can employ a larger duty cycle to ensure that the heating coil has sufficient operating time within a single cycle to fully atomize the aromatic substances in the e-liquid, resulting in a better flavor for the electronic cigarette. In a further embodiment of a preferred embodiment of the present invention, the first carrier frequency is greater than or equal to 20kHz, and the first carrier frequency is greater than or equal to the frequency of sound received by the human ear. The first carrier frequency of the carrier signal can be selected to be greater than or equal to 20kHz so that the switching frequency during operation does not fall within the frequency range that the human ear can hear, thereby preventing the user from perceiving circuit noise and improving the user experience. Meanwhile, the first fundamental frequency is 100Hz. By selecting a low-frequency signal as the fundamental frequency, the working time of the heating wire in a single cycle is made longer while the duty cycle remains unchanged. At the same time, although the heating wire does not work when the fundamental signal is at a low level, it will continue to heat up for a period of time. When the heat of the heating wire has not dropped to the point where it cannot atomize the e-liquid, it is powered on again and the heating wire continues to heat up. Thus, the e-liquid on the heating wire can be fully atomized while using a high-frequency signal to avoid noise.

[0037] In a further embodiment of the present invention, the step of generating a fundamental signal with a first fundamental frequency and a duty cycle equal to the current fundamental frequency, and modulating a carrier signal based on the fundamental signal with the current fundamental frequency to obtain a high-frequency voltage control signal, wherein the first fundamental frequency is less than the first carrier frequency, includes: S310. Generate a fundamental signal with a frequency of the first fundamental frequency and a duty cycle of the current fundamental frequency through the PWM module. S320. The carrier signal is loaded onto the PWM module, and the carrier signal on the PWM module is modulated by the fundamental signal to obtain a high-frequency voltage control signal.

[0038] Specifically, the PWM module is connected to a timer for generating a fundamental signal at a first fundamental frequency. The PWM module itself provides a carrier signal at a first carrier frequency, i.e., a high-frequency signal. Simultaneously, the carrier signal is loaded onto the PWM module. When the fundamental signal output by the timer is low, the PWM module does not output, thereby controlling the operating state of the PWM module and achieving modulation of the carrier signal using the fundamental signal. The signal output from the PWM module is the high-frequency voltage control signal.

[0039] S400: Modulate the battery voltage according to the high-frequency voltage control signal to obtain a high-frequency voltage signal with an average value of the target voltage value, and control the heating wire to heat under the high-frequency voltage signal; Specifically, the battery voltage is modulated by the high-frequency voltage control signal. The frequency and duty cycle of the resulting high-frequency voltage signal are determined by the high-frequency voltage control signal, while the amplitude of the high-frequency voltage signal is determined by the battery voltage. The high-frequency voltage signal is used to drive the heating wire for heating and atomization. Ideally, when the electronic cigarette is heated under the high-frequency voltage signal, the average voltage value of the high-frequency voltage signal is equal to the target voltage value.

[0040] S500: Adjust the high-frequency voltage control signal according to the battery voltage to keep the average value of the high-frequency voltage signal at the target voltage value.

[0041] Specifically, since the battery voltage output by the lithium battery is not constant but varies over time, the high-frequency voltage control signal needs to be adjusted according to the current battery voltage. Specifically, this is done by adjusting the current fundamental duty cycle of the fundamental signal and / or the current carrier duty cycle of the carrier signal, thereby adjusting the duty cycle and waveform of the high-frequency voltage control signal, and ultimately adjusting the duty cycle of the high-frequency voltage signal output to the heating wire.

[0042] In a preferred embodiment of the present invention, the step of adjusting the high-frequency voltage control signal according to the battery voltage to maintain the average value of the high-frequency voltage signal at a target voltage value includes: S510. At regular intervals, reacquire the battery voltage, the current fundamental frequency duty cycle of the fundamental frequency signal, and the current carrier duty cycle of the carrier signal; S520. If the fundamental frequency duty cycle is less than 100%, calculate the corrected fundamental frequency duty cycle based on the battery voltage and the current carrier duty cycle, and use the corrected fundamental frequency duty cycle as the current fundamental frequency duty cycle. S530. If the fundamental frequency duty cycle is equal to 100%, calculate the corrected carrier duty cycle based on the battery voltage, and use the corrected carrier duty cycle as the current carrier duty cycle. S540. Based on the fundamental signal whose duty cycle is the fundamental signal's duty cycle, the carrier signal whose duty cycle is the carrier signal's duty cycle is modulated to obtain the corrected high-frequency voltage control signal.

[0043] Specifically, when the fundamental frequency duty cycle is less than 100%, the high-frequency voltage signal is first adjusted by adjusting the duty cycle of the fundamental frequency signal to maintain the output voltage at the target voltage value. The current carrier duty cycle of the carrier signal is greater than or equal to 90% and less than or equal to 95%. This invention uses a high-frequency signal above 20kHz as the carrier signal and a low-frequency signal below 20kHz as the fundamental frequency signal, so that the effective output voltage can be adjusted over a wide range by adjusting the current fundamental frequency duty cycle. When the battery voltage decreases, in order to maintain a constant output power, only the duty cycle of the fundamental frequency signal, i.e., the current fundamental frequency duty cycle, is adjusted first. When the current fundamental frequency duty cycle accumulates to 100%, the current carrier duty cycle is further adjusted until the current carrier duty cycle also reaches 100%. If the rated power of the heating wire cannot be reached even when both the fundamental frequency signal and the carrier signal are at their maximum values, i.e., the average value of the high-frequency voltage signal cannot reach the target voltage value, then both the fundamental frequency and the carrier frequency are output at full power with a 100% duty cycle. Because the heating wire maintains its heat for a period of time, it can be controlled by a carrier signal with a frequency above 20kHz. Simultaneously, the power is restarted before the heating wire cools down to the point where it can no longer atomize e-liquid. This process is repeated periodically to ensure that the high-frequency voltage signal changes accordingly with the battery voltage, maintaining a constant power output for the heating wire.

[0044] For example, the target voltage is set to 3.2V, and the lithium battery voltage is 4.2V when it is working. When pulse width modulation is performed using a high-frequency signal alone, the duty cycle of the high-frequency signal is 3.2 / 4.2 = 0.76, or 76%. That is, when the high-frequency signal frequency is 20kHz, in a 50µs cycle, the heating time of the heating wire is 50 x 0.76 = 38µs, and the heating off time is 12µs. In other words, the heating time in a single cycle is 38µs, and the non-heating time is 12µs. The long interval between these two times results in an excessively long cooling time for the heating element, causing the e-liquid to not be fully atomized, thus reducing the flavor experience.

[0045] In this invention, the initial setting of the carrier signal's current carrier duty cycle is 95%, and the first carrier frequency is 20kHz. Within a single cycle, the heating state is active for 47.5µs and deactivated for 2.5µs. This reduces the time for the heating wire to shut off and stop heating by approximately 60% compared to the original 20kHz frequency setting. Even when heating stops, the residual heat maintained by the heating wire can continue to atomize the e-liquid. Simultaneously, the average voltage after the carrier signal is applied is 0.95 x 4.2 = 3.99V. Therefore, at the same target output voltage of 3.2V, the current fundamental frequency duty cycle is 3.2 / 3.99 = 0.8, or 80%. The duty cycle in the low-frequency band is also larger than when there is no carrier. When the battery voltage decreases, the low-frequency band enters full power output earlier. When the heating wire is operating at full power, there are no noise or flavor issues.

[0046] Secondly, the present invention provides a readable storage medium storing a computer program thereon, which, when executed by a processor, implements the aforementioned electronic cigarette heating noise suppression method. Specific details are as described in the specific embodiments of the electronic cigarette heating noise suppression method, and will not be repeated here.

[0047] Thirdly, please refer to Figure 2The present invention also provides an electronic cigarette heating noise suppression circuit, comprising: a microcontroller unit 100, an output switch module 200, and a heating wire (not shown in the figure); wherein, one end of the heating wire is connected to the output switch module 200 through a positive pad, and the other end of the heating wire is grounded through a negative pad. The signal control terminal of the microcontroller unit 100 is connected to the control terminal of the output switch module 200, and the detection terminal of the microcontroller unit 100 is connected to the second connection terminal of the output switch module 200; used to obtain the battery voltage B+ through the detection terminal and output a high-frequency voltage signal to the output switch module 200, for implementing the electronic cigarette heating noise suppression method described above; the first connection terminal of the output switch module 200 is connected to the battery voltage B+, and the second connection terminal of the output switch module 200 is connected to the heating wire, used to modulate the battery voltage B+ based on the high-frequency voltage control signal; the heating wire heats according to the high-frequency voltage signal.

[0048] Specifically, the output switch module 200 is connected to the input terminal of the battery voltage B+. When the first and second connection terminals of the output switch module 200 are turned on, the heating wire is connected to the battery voltage B+. When the first and second connection terminals of the output switch module 200 are turned off, the heating wire circuit is turned off and the heating wire does not work. Therefore, it can be controlled by controlling the high-frequency voltage signal at the control terminal of the output switch module 200.

[0049] In some preferred embodiments, the output switch module 200 includes a first field-effect transistor Q1, a second resistor R2, and a third resistor R3. The source of the first field-effect transistor Q1 is connected to the battery voltage B+, the drain of the first field-effect transistor Q1 is connected to the heating wire, the gate of the first field-effect transistor Q1 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the signal control terminal of the microcontroller unit 100. One end of the second resistor R2 is connected to the source of the first field-effect transistor Q1, and the other end of the second resistor R2 is connected to the gate of the first field-effect transistor Q1. The first field-effect transistor Q1 is a PMOS field-effect transistor (P-Metal-Oxide-Semiconductor Field-Effect Transistor). When the high-frequency voltage control signal outputs a low level, the output switch module 200 is turned on, and the heating wire heats up. Therefore, the high-frequency voltage signal and the high-frequency voltage control signal are out of phase with each other. It should be noted that the first field-effect transistor Q1 can also be an NMOS field-effect transistor. The high-frequency voltage signal and the high-frequency voltage control signal are in phase with each other. The calculation method of the duty cycle relationship between the out-of-phase signal and the in-phase signal is existing technology and will not be elaborated here.

[0050] Furthermore, the microcontroller unit 100 includes a microcontroller chip U1, a first resistor R1, and a first capacitor C1. One end of the first resistor R1 is connected to the battery voltage B+, and the other end of the first resistor R1 and one end of the first capacitor C1 are respectively connected to the power supply terminal of the microcontroller chip U1. The other end of the first capacitor C1 is grounded. The control terminal of the microcontroller chip U1 is connected to the output switch module 200, and the detection terminal of the microcontroller chip U1 is connected to the heating wire. The model of the microcontroller chip U1 can be SC8F076AD824NPR.

[0051] Further, the microcontroller unit 100 includes a memory, a processor, a timer, and a PWM module; wherein, the memory is used to store a computer program that can be run on the processor and to store a predetermined target voltage value; the processor is connected to the memory and is used to calculate the current fundamental duty cycle, the current carrier duty cycle, and the carrier average value; the timer is connected to both the processor and the PWM module and is used to generate a carrier signal with a duty cycle equal to the current carrier duty cycle and output it to the PWM module; the PWM module is connected to the output switch module 200 and is used to generate a fundamental signal with a duty cycle equal to the current fundamental duty cycle, modulate the carrier signal according to the fundamental signal, and output the high-frequency voltage control signal to the output switch module 200.

[0052] Specifically, the carrier signal is set using the output of the PWM module, and the fundamental frequency is determined by the MCU's timer count. First, the carrier duty cycle can be as large as possible, for example, set to 90-95%. The fundamental duty cycle can be inversely calculated from the required output power; the calculation process is described in the embodiment of the electronic cigarette heating noise suppression method, and will not be repeated here. This invention uses a fundamental signal to modulate the carrier signal for control. Compared to a control method that simply adjusts the duty cycle of a low-frequency signal, in the low-frequency band, for example, using a frequency of 100Hz, this invention uses both a high-frequency signal as the carrier signal and a low-frequency signal as the fundamental signal for modulation. The output voltage only accounts for 90% of the battery voltage B+. In this invention, the current carrier duty cycle in a single cycle is greater than the duty cycle of a low-frequency output voltage or a high-frequency output voltage. Furthermore, when adjusting the duty cycle, the current fundamental duty cycle of the low-frequency signal first reaches 100%, at which point the frequency of the low-frequency signal disappears. Only the high-frequency carrier signal exhibits duty cycle variations. By increasing the carrier's duty cycle, the predetermined output power is achieved. If the carrier's duty cycle reaches 100%, the first field-effect transistor Q1 is directly controlled to remain on when the heating wire is operating, and directly turned off when atomization needs to be deactivated. This scheme uses a frequency higher than that perceptible to the human ear as the first carrier frequency to determine the carrier signal. A timer is used to simulate a low-frequency signal with a fundamental frequency to control the switching of the carrier signal. By linking these two frequencies, the output power is kept constant, simultaneously addressing noise and flavor issues during smoking.

[0053] This invention provides a method for suppressing heating noise in electronic cigarettes, a readable storage medium, and a circuit. The method includes the following steps: acquiring a battery voltage and a target voltage value, and generating a carrier signal with a first carrier frequency and a duty cycle equal to the current carrier duty cycle based on the battery voltage; calculating the current fundamental duty cycle of a fundamental signal based on the carrier signal; generating a fundamental signal with a first fundamental frequency and a duty cycle equal to the current fundamental duty cycle, and modulating the carrier signal based on the fundamental signal to obtain a high-frequency voltage control signal, wherein the first fundamental frequency is less than the first carrier frequency; modulating the battery voltage according to the high-frequency voltage control signal to obtain a high-frequency voltage signal with an average value equal to the target voltage value, and controlling the heating wire to heat under the high-frequency voltage signal; and adjusting the high-frequency voltage control signal according to the battery voltage to maintain the average value of the high-frequency voltage signal at the target voltage value. This invention uses a low-frequency signal as the fundamental wave signal to modulate a high-frequency signal as the carrier wave signal, thereby making the overall frequency greater than the frequency range that the human ear can detect. At the same time, since the fundamental wave is a low-frequency signal, the duty cycle of the carrier wave can be further increased under the same average voltage, so that the atomizer works for a longer period of time in one cycle, allowing the substances in the e-liquid to be fully atomized and improving the flavor of the vapor.

[0054] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A method for suppressing heating noise in electronic cigarettes, characterized in that the steps include... include: Obtain the battery voltage and target voltage values, and generate a carrier signal with a first carrier frequency and a duty cycle equal to the current carrier duty cycle based on the battery voltage; The current fundamental duty cycle of the fundamental signal is calculated based on the carrier signal; A fundamental wave signal with a first fundamental wave frequency and a duty cycle equal to the current fundamental wave duty cycle is generated, and a carrier signal is modulated based on the fundamental wave signal with the current fundamental wave duty cycle to obtain a high-frequency voltage control signal, wherein the first fundamental wave frequency is less than the first carrier frequency. The battery voltage is modulated according to the high-frequency voltage control signal to obtain a high-frequency voltage signal with an average value of the target voltage value, and the heating wire is controlled to heat under the high-frequency voltage signal. The high-frequency voltage control signal is adjusted according to the battery voltage to keep the average value of the high-frequency voltage signal at the target voltage value.

2. The method for suppressing heating noise in electronic cigarettes according to claim 1, characterized in that, The step of adjusting the high-frequency voltage control signal according to the battery voltage to maintain the average value of the high-frequency voltage signal at the target voltage value includes: Every so often, the battery voltage, the current fundamental frequency duty cycle of the fundamental signal, and the current carrier duty cycle of the carrier signal are reacquired. If the fundamental frequency duty cycle is less than 100%, a corrected fundamental frequency duty cycle is calculated based on the battery voltage and the current carrier duty cycle, and the corrected fundamental frequency duty cycle is used as the current fundamental frequency duty cycle; If the fundamental duty cycle is equal to 100%, the corrected carrier duty cycle is calculated based on the battery voltage, and the corrected carrier duty cycle is used as the current carrier duty cycle; The corrected high-frequency voltage control signal is obtained by modulating the carrier signal with the duty cycle of the carrier signal using the fundamental signal with the duty cycle of the fundamental signal.

3. The method for suppressing heating noise in electronic cigarettes according to claim 1, characterized in that, The step of calculating the current fundamental duty cycle of the fundamental signal based on the carrier signal includes: Acquire the carrier signal and target voltage value; The average carrier value is calculated based on the carrier signal, and the average carrier value is the average voltage value of the carrier signal; The current fundamental frequency duty cycle of the fundamental signal is calculated based on the average carrier frequency, the target voltage value, and the current carrier duty cycle.

4. The method for suppressing heating noise in electronic cigarettes according to claim 1, characterized in that, The step of acquiring the battery voltage and target voltage value, and generating a carrier signal with a first carrier frequency and a duty cycle equal to the current carrier duty cycle based on the battery voltage includes: Read the pre-stored first carrier frequency, current carrier duty cycle, battery voltage, and target voltage value; The first carrier frequency and the current carrier duty cycle are input into a timer, and a carrier signal with the first carrier frequency and the current carrier duty cycle is obtained by counting with the timer.

5. The method for suppressing heating noise in electronic cigarettes according to claim 4, characterized in that, The step of generating a fundamental signal with a first fundamental frequency and a duty cycle equal to the current fundamental frequency, and modulating a carrier signal based on the fundamental signal with the current fundamental frequency to obtain a high-frequency voltage control signal, wherein the first fundamental frequency is less than the first carrier frequency, includes: The PWM module generates a fundamental signal with a frequency of the first fundamental frequency and a duty cycle of the current fundamental frequency. The carrier signal is loaded onto the PWM module, and the carrier signal on the PWM module is modulated by the fundamental signal to obtain a high-frequency voltage control signal.

6. The method for suppressing heating noise in electronic cigarettes according to claim 2, characterized in that, In the step of calculating a corrected fundamental frequency duty cycle based on the battery voltage and the current carrier duty cycle if the fundamental frequency duty cycle is less than 100%, and using the corrected fundamental frequency duty cycle as the current fundamental frequency duty cycle, the current carrier duty cycle of the carrier signal is greater than or equal to 90% and less than or equal to 95%.

7. The method for suppressing heating noise in electronic cigarettes according to claim 1, characterized in that, The first carrier frequency is greater than or equal to 20kHz, and the first carrier frequency is greater than or equal to the frequency of sound received by the human ear; the first fundamental frequency is 100Hz.

8. A readable storage medium, characterized in that, It stores a computer program, which, when executed by a processor, implements the electronic cigarette heating noise suppression method according to any one of claims 1 to 7.

9. A noise suppression circuit for electronic cigarette heating, characterized in that, include: Microcontroller unit, output switch module, and heating wire; among which, The signal control terminal of the microcontroller is connected to the control terminal of the output switch module, and the detection terminal of the microcontroller is connected to the second connection terminal of the output switch module; it is used to obtain the battery voltage through the detection terminal and output a high-frequency voltage signal to the output switch module, thereby implementing the electronic cigarette heating noise suppression method according to any one of claims 1 to 7. The first connection terminal of the output switch module is connected to the battery voltage, and the second connection terminal of the output switch module is connected to the heating wire, which is used to modulate the battery voltage based on the high-frequency voltage control signal; The heating wire is heated according to the high-frequency voltage signal.

10. The electronic cigarette heating noise suppression circuit according to claim 9, characterized in that, The microcontroller unit includes a memory, a processor, a timer, and a PWM module. The memory stores a computer program that can run on the processor and stores a predetermined target voltage value. The processor, connected to the memory, calculates the current fundamental duty cycle, the current carrier duty cycle, and the carrier average value. The timer is connected to both the processor and the PWM module, generating a carrier signal with a duty cycle equal to the current carrier duty cycle and outputting it to the PWM module. The PWM module is connected to the output switch module and is used to generate a fundamental signal with a duty cycle equal to the current fundamental duty cycle, modulate the carrier signal according to the fundamental signal, and output the high-frequency voltage control signal to the output switch module.

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