CN114468394A - Resonant frequency extraction method, driving method and atomization system - Google Patents
Resonant frequency extraction method, driving method and atomization system Download PDFInfo
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- CN114468394A CN114468394A CN202210165458.7A CN202210165458A CN114468394A CN 114468394 A CN114468394 A CN 114468394A CN 202210165458 A CN202210165458 A CN 202210165458A CN 114468394 A CN114468394 A CN 114468394A
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/50—Control or monitoring
Abstract
A resonant frequency extraction method, a driving method and an atomization system are provided, wherein the resonant frequency extraction method is used for an ultrasonic atomization sheet of an electronic cigarette, and comprises the following steps: a pulse transmitting step of transmitting a narrow pulse signal to the atomizing sheet; a feedback obtaining step of obtaining a self-resonance signal output by the atomization sheet under the drive of a narrow pulse signal; and a frequency extraction step, namely performing frequency extraction on the self-resonance signal to obtain the resonance frequency of the atomization sheet. Through adopting the narrow pulse excitation atomizing piece, gather the self-resonance signal that the atomizing piece produced to can obtain the current resonant frequency of atomizing piece, from this, can drive the atomizing piece work through the drive signal with current resonant frequency is with the same frequency, make the atomizing piece be in the operating frequency who matches all the time, guarantee the atomization effect of electron cigarette, ensure user's use and experience.
Description
Technical Field
The invention relates to the technical field of ultrasonic electronic cigarettes, in particular to a resonant frequency extraction method, a driving method and an atomization system.
Background
The ultrasonic atomization sheet in the ultrasonic electronic cigarette is driven to oscillate with the maximum efficiency only by loading a high-voltage signal matched with the resonant frequency of the atomization sheet.
The prior art adopts a fixed frequency mode, and the method has the problems that the resonant frequency of the ultrasonic atomization sheet is smaller and smaller along with the rise of the temperature, so that the current in a circuit is changed, the ultrasonic atomization sheet is easy to lose efficacy, components in the circuit are easy to burn off, and the use cost is increased.
Therefore, when the working circuit is not matched with the resonant frequency, the atomization effect of the ultrasonic atomization sheet is poor, and the user experience is poor.
Disclosure of Invention
The invention mainly solves the technical problems that the atomization sheet of the existing ultrasonic electronic cigarette has resonance frequency change, so that the frequency of a driving signal is not matched with the resonance frequency, and the atomization effect is poor.
According to a first aspect, an embodiment provides a resonant frequency extraction method for an ultrasonic atomization patch of an electronic cigarette, comprising:
a pulse transmitting step of transmitting a narrow pulse signal to the atomizing sheet;
a feedback obtaining step of obtaining a self-resonance signal output by the atomization sheet under the drive of a narrow pulse signal;
and a frequency extraction step, namely performing frequency extraction on the self-resonance signal to obtain the resonance frequency of the atomization sheet.
According to a second aspect, an embodiment provides a driving method for an ultrasonic atomization sheet of an electronic cigarette, including:
a starting step of acquiring a starting signal triggered by a user;
an extraction step, under the trigger of a starting signal, executing the resonant frequency extraction method described in the first aspect to obtain the resonant frequency of the atomization plate;
and an atomization driving step of sending a driving signal with the same frequency as the resonant frequency to the atomization sheet to drive the atomization sheet to work.
According to a third aspect, there is provided in one embodiment a vaping system for an electronic cigarette, comprising:
the atomization piece is used for atomizing tobacco tar in the electronic cigarette;
the narrow pulse signal transmitting module is used for transmitting a narrow pulse signal to the atomizing sheet;
the driving module is used for sending a working signal with the same frequency as the input signal to the atomizing sheet under the driving of the input signal so as to drive the atomizing sheet to work; the input signals comprise narrow pulse signals and driving signals; the atomization sheet outputs a self-resonance signal under the driving of a working signal corresponding to the narrow pulse signal;
the processing module is used for controlling the narrow pulse signal transmitting module to transmit the narrow pulse signal under the triggering of the starting signal triggered by the user; and acquiring a self-resonance signal, and performing frequency extraction on the self-resonance signal to obtain the resonance frequency of the atomization sheet.
According to a fourth aspect, an embodiment provides a driving method of an ultrasonic atomization sheet for an electronic cigarette, including:
a pulse transmitting step of transmitting a narrow pulse signal to the atomizing sheet;
a feedback obtaining step of obtaining a self-resonance signal output by the atomization sheet under the drive of a narrow pulse signal;
and an atomization driving step of intercepting part of the self-resonance signal or copying all the self-resonance signal to obtain a source signal, generating a driving signal according to the source signal and driving the atomization sheet to work.
According to a fifth aspect, an embodiment provides a nebulizing system for an electronic cigarette, comprising:
the atomization sheet is used for carrying out ultrasonic atomization on tobacco tar in the electronic cigarette;
the narrow pulse signal transmitting module is used for transmitting a narrow pulse signal to the atomizing sheet;
the driving module is used for sending a working signal with the same frequency as the input signal to the atomizing sheet under the driving of the input signal so as to drive the atomizing sheet to work; the input signals comprise narrow pulse signals and driving signals; the atomization sheet outputs a self-resonance signal under the driving of a working signal corresponding to the narrow pulse signal;
the processing module is used for controlling the narrow pulse signal transmitting module to transmit the narrow pulse signal under the triggering of the starting signal triggered by the user; the method comprises the steps of obtaining a self-resonance signal, intercepting part of the self-resonance signal or copying all the self-resonance signal to obtain a source signal, generating a driving signal according to the source signal, sending the driving signal to a driving module, and driving an atomization sheet to work through the driving module.
According to the resonant frequency extraction method, the driving method and the atomization system of the embodiment, the narrow pulse is adopted to excite the atomization sheet, and the self-resonant signal generated by the atomization sheet is collected, so that the current resonant frequency of the atomization sheet can be obtained, therefore, the atomization sheet can be driven to work through the driving signal with the same frequency as the current resonant frequency, the atomization sheet is always in the matched working frequency, the atomization effect of the electronic cigarette is ensured, and the use experience of a user is ensured.
Drawings
Fig. 1 is a flowchart of a resonant frequency extraction method according to an embodiment;
FIG. 2 is a schematic diagram of a self-resonant signal provided by an embodiment;
fig. 3 is a flowchart of a driving method of an ultrasonic atomization sheet for an electronic cigarette according to an embodiment;
fig. 4 to 6 are schematic structural views of an atomization system according to an embodiment;
fig. 7 is a flowchart of a driving method of an ultrasonic atomization sheet for an electronic cigarette according to another embodiment;
fig. 8 is a schematic structural diagram of an atomization system according to another embodiment.
Reference numerals: 10-atomizing tablets; 20-narrow pulse signal transmitting module; 30-a drive module; 40-a processing module; 50-a start module; 51-silicon microphone head; 52-an amplifying circuit; 53-a switching circuit; 60-a filtering module; 70-a comparison module; 80-power supply module.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
The existing ultrasonic electronic cigarette mostly adopts a drive signal with fixed frequency to drive the atomization sheet to work, and the existing ultrasonic electronic cigarette has the problem that the resonant frequency of the ultrasonic atomization sheet is smaller and smaller along with the rise of temperature, so that the current in the circuit is changed, the ultrasonic atomization sheet is easy to lose efficacy, components in the circuit are easy to burn, and the use cost is increased. Further, when the frequency of the driving signal is not matched with the resonant frequency, the atomization effect of the ultrasonic atomization sheet is poor, and the user experience is poor.
At present, the resonant frequency of the atomizing plate can be obtained through a frequency sweeping technology, specifically, a plurality of driving signals with different frequencies are sent to sequentially drive the atomizing plate to work, and by obtaining the working current of the atomizing plate, the corresponding frequency is the resonant frequency when the current is the maximum. The drive signals are typically sent at a number of different frequencies in fixed interval steps Δ f, in a range [ fmin, fmax ] around the desired resonant frequency f 0. The frequency sweeping method has the disadvantages that the interval step length delta f cannot be infinitely small, the number of times of the sent driving signals cannot be too many, the frequency corresponding to the acquired maximum working current is not necessarily the current resonant frequency, meanwhile, the current resonant frequency of the atomizing sheet can exceed the front and back ranges, and the measurement precision is insufficient. And the working life of the atomizing plate is limited, and the frequency sweeping can not be carried out for many times before each atomization, so that the service life of the atomizing plate is influenced.
In the embodiment of the invention, the current resonant frequency of the atomizing plate can be obtained according to the self-resonant signal of the atomizing plate by loading the single or a plurality of narrow pulse signals to the atomizing plate, so that the resonant frequency of the atomizing plate can be obtained at one time, and the atomizing effect of the atomizing plate is ensured.
The first embodiment is as follows:
referring to fig. 1, the present embodiment provides a resonant frequency extraction method for an ultrasonic atomization plate of an electronic cigarette, including:
and a pulse emission step of sending a narrow pulse signal to the atomization sheet.
Specifically, the narrow pulse signal may be sent out once or multiple times; and may be of the square wave pulse or spike or sine wave pulse type. The narrow pulse signal has the characteristics of short duration and wide frequency range of coverage. The narrow pulse signal may be generated by a narrow pulse generator, or may be generated by a processor or controller having a corresponding function.
For example, the pulse width of the narrow pulse signal may be less than 300 nanoseconds or less than 1/3f0，f0The theoretical resonant frequency of the atomization plate and/or the voltage of the narrow pulse signal in the preset pulse width is larger than the preset voltage. The theoretical resonant frequency of the corresponding atomization plate can be 1MHz, 2MHz, 3MHz and the like. In one application scenario, the width of the narrow pulse signal may be 50ns, and the maximum voltage may be 100V. For another example, the preset voltage may be twice the high level of the circuit, and in general, the high level of the circuit is 5V, and in this case, the preset voltage may be greater than or equal to 10V.
And a feedback acquisition step of acquiring a self-resonance signal output by the atomization sheet under the drive of the narrow pulse signal.
For example, as shown in fig. 2, when the narrow pulse signal is a single transmission, the self-resonance signal of the atomization plate is a first-order attenuation curve, wherein the first-order attenuation curve includes information about the current resonance frequency of the atomization plate.
And a frequency extraction step, namely performing frequency extraction on the self-resonance signal to obtain the resonance frequency of the atomization sheet.
Specifically, when the narrow pulse signal is transmitted in a single time, the frequency extracting step may include:
the head wave of the self-resonant signal is removed.
And carrying out frequency extraction on the waveform of the self-resonance signal within the preset width range to obtain the resonance frequency of the atomization sheet, wherein the starting point of the preset width range is the tail end of the head wave. For example, as shown in fig. 2, when the narrow pulse signal is a single transmission, the self-resonance signal is a first-order attenuation curve, and the part behind the head wave can be used to obtain the resonance frequency of the atomization plate, and the width of the head wave is about 1 us. The predetermined width may be 2us, and about 5-6 waveforms are frequency extracted.
Frequency extraction methods include, but are not limited to: the analog-to-digital conversion is changed into a digital signal or an analog signal is changed into a digital signal through a switch circuit, and frequency information is extracted by methods such as fast Fourier transform or ringing counting.
For example, removing the head wave signal, and calculating the number N of times of crossing the zero point in unit time (second); the resonant frequency of the current atomization plate is N/2 Hz.
In one possible implementation, the frequency extracting a waveform within a preset width range of the self-resonant signal includes:
and performing analog-to-digital conversion on the self-resonance signal to obtain a digitized self-resonance signal.
And carrying out fast Fourier change or ringing counting on the digitized self-resonance signal, and extracting the resonance frequency of the atomization piece.
The frequency components of the signals are extracted through fast Fourier transform, the maximum frequency value can be obtained fast, and high frequency resolution can be achieved. The ringing count can judge the frequency of the signal by calculating the number of times of crossing the zero point in unit time of the signal, and has the characteristics of simplicity and quickness. The zero point may be corrected according to the characteristics of the ultrasonic atomizing sheet.
In one possible implementation manner, as shown in fig. 1, after the feedback acquiring step and before the frequency extracting step, the resonant frequency extracting method may further include:
a filtering processing step, namely determining a filtering range according to the ideal resonance frequency of the atomization sheet; for example, the filtering range is f0±δf0δ may include, but is not limited to, 10% to 20%.
And filtering the self-resonance signal through the filtering range to obtain a filtered self-resonance signal. The filtering process may be a combination of high-pass filtering and low-pass filtering to remove noise, such as 2.5MHz high-pass filtering. The resonant frequency of the atomization plate can be adjusted according to the ideal resonant frequency of the atomization plate. Meanwhile, amplification processing can be performed before or after the filtering processing, sequence adjustment is performed according to the size of noise, and the purpose of amplification is to amplify an in-band signal so as to facilitate sampling processing of subsequent devices such as an analog-to-digital converter and the like.
The embodiment provides a resonant frequency extraction method, an ultrasonic atomization sheet is equivalent to a resistance-capacitance and capacitance circuit, when the equivalent circuit loads a short-time energy narrow pulse signal, which is equivalent to charging the circuit in a short time, the resistance-capacitance circuit generates a first-order oscillation effect under the action of the signal, outputs a self-resonant signal of a first-order attenuation curve, and the resonant frequency of the circuit, namely the resonant frequency of the ultrasonic atomization sheet, can be accurately and efficiently obtained by analyzing the curve. Therefore, before each atomization of the electronic cigarette, the electronic cigarette can be driven to atomize by the driving signal with the same frequency of the current resonance frequency, so that the service life of the atomizing sheet and the atomizing effect are ensured.
Therefore, the resonant frequency extraction method can efficiently obtain the resonant frequency of the atomization plate without carrying out multiple frequency sweeps, and has higher resolution and precision compared with a frequency sweep technology.
Example two:
referring to fig. 3, the present embodiment provides a driving method of an ultrasonic atomization plate for an electronic cigarette, including:
and a starting step of acquiring a starting signal triggered by a user.
Specifically, when a user uses the electronic cigarette, air flow is generated in a flue of the electronic cigarette by inhaling air, a pressure signal or a sound signal generated by the user can be acquired by a pressure sensor or a silicon microphone or other sensors, a corresponding voltage signal can be obtained after corresponding processing, when the voltage signal is greater than a preset threshold value, the user can be judged to smoke, and a starting signal is triggered accordingly, wherein the starting signal can be level triggering or edge triggering, such as a high-level signal. Each successive actuation signal represents a nebulization procedure.
And an extracting step of executing the resonant frequency extracting method described in any one of the possible implementation manners in the first embodiment to obtain the resonant frequency of the atomization plate under the trigger of the starting signal.
And an atomization driving step of sending a driving signal with the same frequency as the resonant frequency to the atomization sheet to drive the atomization sheet to work.
The driving signal can be a continuous pulse signal or an intermittent pulse signal, and a group of pulse signals have certain intervals. The interval time, the duration time of the pulse signal and the end transmission time of the pulse signal can be set according to actual conditions. The driving signal acts on the ultrasonic atomization sheet, so that the atomization sheet generates an atomization effect. For example, the drive signal may be a continuous square wave pulse signal with a 50% duty cycle.
In one possible implementation, the driving method may further include:
and stopping, namely obtaining a stop signal triggered by a user and controlling the atomizing sheet to stop working.
Specifically, when the user does not use the electronic cigarette, the voltage signal of the sensor is smaller than the preset threshold value, and it can be determined that the user does not perform smoking behavior, so that a shutdown signal is triggered, and the shutdown signal can be a low-level signal correspondingly.
And a re-atomization step, acquiring a starting signal newly triggered by a user, and sequentially executing the extraction step and the atomization driving step under the triggering of the new starting signal so as to realize re-extraction of the resonant frequency of the atomization sheet and re-drive the atomization sheet to work.
When the user smoked the action once more, trigging start signal again, through repeating above-mentioned step, acquireed new resonant frequency then drive atomizing to guarantee that ultrasonic atomization piece is atomized at resonant frequency and near all the time, can ensure that the atomization piece still atomizes with the drive signal who matches resonant frequency, in order to guarantee atomization effect.
The driving method provided by the embodiment of the invention can efficiently and precisely acquire the resonant frequency of the atomizing sheet to drive the atomizing sheet of the electronic cigarette to work, so that the atomizing sheet can always work under a matched driving signal, and the atomizing effect and the smoking experience of a user are ensured. Meanwhile, even if the resonant frequency of the atomizing plate deviates more from the ideal resonant frequency, the driving method can still drive the atomizing plate to work efficiently.
Example three:
referring to fig. 4 to 6, the present embodiment provides an atomization system of an electronic cigarette, including:
the atomization sheet 10 is used for atomizing tobacco tar in the electronic cigarette; the atomization sheet 10 may be a high frequency ceramic sheet with resonant frequencies including, but not limited to, 1MHz, 2MHz, or 3 MHz.
And the narrow pulse signal transmitting module 20 is used for transmitting a narrow pulse signal to the atomizing plate 10. For example, the narrow pulse signal transmitting module 20 may include a delay module and a narrow pulse signal generating circuit, and the width of the pulse may be adjusted by adjusting the delay of the delay module and the RC time constant of the narrow pulse signal generating circuit. Alternatively, a narrow pulse signal is directly generated by a processor or a controller having a corresponding function.
The driving module 30 is configured to send a working signal with the same frequency as the input signal to the atomization plate 10 under the driving of the input signal, so as to drive the atomization plate 10 to work; the input signal may include a narrow pulse signal and a drive signal; the atomization plate 10 outputs a self-resonance signal under the driving of a working signal corresponding to the narrow pulse signal. The driving module 30 may include a voltage boosting circuit and a switching tube driving circuit, wherein the voltage boosting circuit is configured to convert the low-voltage electric energy provided by the power module 80 into a high voltage of the working voltage of the atomizing plate 10, and load the high voltage into the switching tube driving circuit. After the high voltage provided by the boosting circuit is input, the switching tube driving circuit provides a high-voltage output or 0V output high-voltage working signal with the same frequency as the input signal to the atomizing sheet 10 under the control and driving of the input signal.
The processing module 40 is used for controlling the narrow pulse signal transmitting module 20 to transmit the narrow pulse signal under the triggering of the starting signal triggered by the user; and acquiring a self-resonance signal, and performing frequency extraction on the self-resonance signal to obtain the resonance frequency of the atomization sheet 10. The processing module 40 may be a chip with an operation processing capability, such as a processor (CPU), a single chip Microcomputer (MCU), a Programmable Logic Controller (PLC), a programmable gate array (FPGA), or other available devices. The application is not limited to the form of hardware, and any device capable of achieving the above technical effects can be applied.
As shown in fig. 4, the nebulizing system may further comprise an activation module 50, the activation module 50 being configured to generate an activation signal under the influence of the user's breath.
For example, the start module 50 may include a silicon microphone head 51 or a pressure sensor, as shown in fig. 5, when the silicon microphone head 51 is used, the start module 50 may include an amplifying circuit 52 and a switching circuit 53, wherein the amplifying circuit 52 may include an amplifier for converting a capacitance signal of the silicon microphone head 51 into a voltage signal, and the switching circuit 53 may include a comparator for outputting a high level or a low level as the start signal when the voltage signal is greater than a threshold value by comparing with a reference voltage. Similarly, the pressure sensor may detect the pressure generated by the user during inhalation, and generate a corresponding voltage signal that may activate the signal via the switching circuit 53. Alternatively, the starting module 50 may be a key module, and a high level signal is triggered by a key.
Furthermore, the processing module 40 can also determine the strength of inhalation of the user according to the magnitude of the voltage signal, and the processing module 40 can adjust the excitation strength of the atomization sheet 10 according to the strength, so as to achieve atomization effects with different strengths and provide different smoking experiences for the user. For example, a plurality of inhalation intensities can be divided by comparison with a plurality of different reference voltages.
In one possible implementation, as shown in fig. 3, the atomization system may further include:
and a filtering module 60, configured to perform filtering processing on the self-resonant signal to obtain a filtered self-resonant signal.
A comparing module 70, configured to compare the filtered self-resonant signal with a reference voltage to obtain a digitized self-resonant signal; for example, the comparing module 70 may include a comparator or an analog-to-digital converter, and the comparator outputs a high level and a low level, i.e., 1 and 0, by inputting a self-resonant signal of the analog signal and a reference voltage, and the reference voltage may be 0V.
Therefore, when the atomization system has the filtering module 60 and the comparing module 70, the processing module 40 may perform frequency extraction on the digitized self-resonant signal when performing frequency extraction on the self-resonant signal.
In a possible implementation manner, as shown in fig. 6, after the processing module 40 obtains the resonant frequency of the atomizing plate 10, the processing module 40 is further configured to generate a driving signal, send the driving signal to the driving module 30, and drive the atomizing plate 10 to operate through the driving module 30; and/or, the processing module 40 is further configured to obtain a user-triggered shutdown signal to control the atomizing plate 10 to stop working. For example, the processing module 40 may include an MCU having a PWM output port through which the driving signal is output.
Specifically, the narrow pulse signal emitting module 20, the filtering module 60 and the comparing module 70 may be turned off by a gating circuit, and when the processing module 40 outputs the driving signal, the extraction of the resonant frequency is not needed, so that the narrow pulse signal is not output during the atomization, and the signal fed back by the atomization sheet 10 under the driving signal does not need to be processed. The gating circuit may include a plurality of switching transistors, such as mos transistors, and the processing module 40 sends high and low levels to control the gating.
In practical applications, the atomization system may further include a power module 80, and the power module 80 is used to directly or indirectly supply power to each power consuming module of the atomization system. The power module 80 may include a battery, a power management circuit and a charging interface, where the power management circuit is used to implement functions of charging management, overcurrent protection, short-circuit protection, and the like.
The modules may be integrated on a circuit board, or a plurality of modules may be integrated on a chip, or a processor may integrate the functions of a plurality of modules. The application does not limit the hardware form to be adopted, and the function of each module is implemented. Each module may also have a separate processor for control, or there may be one processor controlling multiple modules as described above.
Example four:
as shown in fig. 1 to 6, the following description will be made on the method of extracting the resonant frequency and the method of driving the atomization system.
Starting step, the user smokes the electronic cigarette, the starting module 50 generates a starting signal under the triggering of the smoking behavior of the user, and the processing module 40 executes the resonant frequency extraction method under the triggering of the starting signal.
In the pulse transmitting step, the processing module 40 controls the narrow pulse signal transmitting module 20 to transmit a narrow pulse signal to the driving module 30, and the driving module 30 sends a high-voltage working signal corresponding to the narrow pulse signal to the atomizing plate 10 under the driving of the narrow pulse signal to drive the atomizing plate 10 to work.
In the feedback acquisition step, under the driving of a single narrow pulse signal, the atomizing plate 10 generates a first-order oscillation effect and outputs a self-resonance signal of a first-order attenuation curve.
The filtering step, the processing module 40 gates the filtering module 60 and the comparing module 70, so that the self-resonant signal is transmitted to the filtering module 60, and the filtering module 60 and the filtering module 40 set a filtering range for filtering to obtain a filtered self-resonant signal. The filtered self-resonant signal is transmitted to the comparison module 70 for analog-to-digital conversion and finally acquired by the processing module 40.
The frequency extraction step and the processing module 40 acquire the filtered and digitized self-resonant signal, remove the head wave of the self-resonant signal, perform frequency extraction on the signal within the preset width range, and extract the resonant frequency of the atomizing plate 10 by performing fast fourier transform or ringing count on the digitized self-resonant signal.
The atomization driving step and the processing module 40 generate a driving signal with the same frequency as the resonant frequency according to the resonant frequency of the atomization plate 10, and send the driving signal to the driving module 30, and the driving module 30 drives the atomization plate 10 to atomize at the matched resonant frequency. Meanwhile, the processing module 40 turns off the circuits of the filtering module 60, the comparing module 70 and the narrow pulse signal transmitting module 20.
And (3) stopping smoking, namely stopping smoking by a user, generating a stop signal by the starting module 50, and stopping sending a driving signal to the driving module 30 by the processing module 40 under the triggering of the stop signal. And waits for an activation signal to activate the module 50.
Re-atomizing, the user smoking again, and the processing module 40 repeats the above steps to realize re-atomizing.
According to the method and the device, the atomizing sheet is driven by a single narrow pulse signal, so that a self-resonance signal containing atomizing sheet resonance frequency information can be obtained, the situation that the atomizing sheet is continuously driven according to a fixed step length within a certain frequency range in order to find the atomizing sheet resonance frequency in the prior art is avoided, the atomizing response is greatly improved, meanwhile, the damage to the atomizing sheet is reduced, and the service life of the atomizing sheet is prolonged; meanwhile, on the other hand, the working frequency range of the ultrasonic atomization sheet is not limited, and the ultrasonic atomization sheet can be used as long as the atomization sheet is not damaged.
The method for extracting the resonance frequency efficiently through the fast Fourier transform and the ringing counting has the advantages of being fast, efficient and high in frequency resolution. The real resonant frequency of the ultrasonic atomization piece can be obtained with high resolution and high precision, the atomization piece is driven at a resonant point, and the atomization effect is greatly improved.
Example five:
referring to fig. 7 and 8, the present embodiment provides a driving method of an ultrasonic atomization sheet for an electronic cigarette and an atomization system of the electronic cigarette.
The driving method provided by the second embodiment is different from the driving method provided by the second embodiment in that the driving method provided by the second embodiment can directly generate the driving signal with the same frequency through the self-resonant signal without extracting the resonant frequency so as to drive the atomizing plate to work. The atomization system provided by the third embodiment is different from the atomization system provided by the third embodiment in that the processing module in the atomization system provided by the third embodiment can directly generate a driving signal with the same frequency through the self-resonance signal without extracting the resonance frequency so as to drive the atomization sheet to work.
As shown in fig. 7, the driving method provided in this embodiment includes:
pulse emission step, sending a narrow pulse signal to the atomization sheet 80.
Feedback acquisition step, acquiring the self-resonance signal output by the atomization sheet 80 under the drive of the narrow pulse signal.
And an atomization driving step of intercepting part of the self-resonance signal or copying all the self-resonance signal to obtain a source signal, generating a driving signal according to the source signal and driving the atomization sheet 80 to work.
As shown in fig. 8, the atomization system provided in this embodiment includes:
the atomizing sheet 80 is used for performing ultrasonic atomization on tobacco tar in the electronic cigarette.
And the narrow pulse signal transmitting module 20 is used for transmitting a narrow pulse signal to the atomizing plate 80.
The driving module 30 is configured to send a working signal with the same frequency as the input signal to the atomization plate 80 under the driving of the input signal, so as to drive the atomization plate 80 to work; the input signals comprise narrow pulse signals and driving signals; the atomization plate 80 outputs a self-resonance signal under the driving of a working signal corresponding to the narrow pulse signal.
The processing module 40 is used for controlling the narrow pulse signal transmitting module 20 to transmit the narrow pulse signal under the triggering of the starting signal triggered by the user; the method comprises the steps of obtaining a self-resonance signal, intercepting part of the self-resonance signal or copying all the self-resonance signal to obtain a source signal, generating a driving signal according to the source signal, sending the driving signal to the driving module 30, and driving the atomizing plate 80 to work through the driving module 30.
It should be understood that, in the driving method provided in this embodiment, the self-resonant signal may also be processed by filtering, amplifying, and digitizing, and then intercepted by the processing module 40. The driving method provided by the present embodiment may further include the shutdown step and the re-atomization step described in the second to fourth embodiments. The specific process can refer to the relevant description in the second to fourth embodiments. The atomization system provided in this embodiment may further include the power module 80, the starting module 50, the filtering module 60, the comparing module 70, and the like described in the third embodiment and the fourth embodiment, and the functions of the modules implemented in this embodiment are the same, and will not be described herein again.
The following explains the method for driving the atomization system according to this embodiment.
Starting step, the user smokes the electronic cigarette, the starting module 50 generates a starting signal under the triggering of the smoking behavior of the user, and the processing module 40 executes the resonant frequency extraction method under the triggering of the starting signal.
In the pulse transmitting step, the processing module 40 controls the narrow pulse signal transmitting module 20 to transmit a narrow pulse signal to the driving module 30, and the driving module 30 sends a high-voltage working signal corresponding to the narrow pulse signal to the atomization sheet 80 under the driving of the narrow pulse signal to drive the atomization sheet 80 to work.
In the feedback acquisition step, under the driving of a single narrow pulse signal, the atomizing plate 80 generates a first-order oscillation effect and outputs a self-resonance signal of a first-order attenuation curve. The self-resonant signal can be further processed by the filtering module 60 and the comparing module 70 shown in fig. 4, and then transmitted to the processing module 40.
The atomization driving step and processing module 40 obtains the self-resonance signal, intercepts part of the self-resonance signal or copies all of the self-resonance signal to obtain a source signal, generates a driving signal according to the source signal, sends the driving signal to the driving module 30, and drives the atomization sheet 80 through the driving module 30, so as to realize atomization driving of the atomization sheet 80 at the matched resonance frequency. For example, after the head wave is removed, 5-6 waveforms after the head wave are intercepted and directly used as source signals.
And (3) stopping smoking, namely stopping smoking by a user, generating a stop signal by the starting module 50, and stopping sending a driving signal to the driving module 30 by the processing module 40 under the triggering of the stop signal. And waits for an activation signal to activate the module 50.
Re-atomizing, the user smoking again, and the processing module 40 repeats the above steps to realize re-atomizing.
The driving method and the atomization system provided by the implementation are characterized in that the self-resonance signal is directly utilized to generate the driving signal, and the driving signal with the same frequency as the current resonance frequency can be generated without frequency extraction. For further improvement, reference may be made to the second to fourth embodiments.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A resonant frequency extraction method is used for an ultrasonic atomization sheet of an electronic cigarette, and is characterized by comprising the following steps:
a pulse transmitting step of transmitting a narrow pulse signal to the atomizing sheet;
a feedback obtaining step of obtaining a self-resonance signal output by the atomization sheet under the drive of the narrow pulse signal;
and a frequency extraction step of extracting the frequency of the self-resonance signal to obtain the resonance frequency of the atomization sheet.
2. The resonance frequency extraction method as claimed in claim 1, wherein said frequency extraction step comprises:
removing a head wave of the self-resonance signal;
and carrying out frequency extraction on the waveform of the self-resonance signal within a preset width range to obtain the resonance frequency of the atomization sheet, wherein the starting point of the preset width range is the tail end of the head wave.
3. The method for extracting a resonance frequency according to claim 2, wherein said extracting a frequency of a waveform within a preset width range of the self-resonance signal comprises:
performing analog-to-digital conversion on the self-resonance signal to obtain a digitized self-resonance signal;
and carrying out fast Fourier change or ringing counting on the digitized self-resonance signal, and extracting the resonance frequency of the atomization piece.
4. The resonant frequency extraction method of any one of claims 1 to 3, wherein the pulse width of the narrow pulse signal is less than 300 nanoseconds or less than 1/3f0，f0Is the theoretical resonant frequency of the atomization plate.
5. A method for driving an ultrasonic atomization sheet of an electronic cigarette, comprising:
a starting step of acquiring a starting signal triggered by a user;
an extraction step of executing the resonance frequency extraction method of any one of claims 1 to 4 under the trigger of the starting signal to obtain the resonance frequency of the atomization plate;
and an atomization driving step of sending a driving signal with the same frequency as the resonance frequency to the atomization sheet to drive the atomization sheet to work.
6. The driving method according to claim 5, further comprising:
stopping, namely obtaining a stop signal triggered by a user and controlling the atomizing sheet to stop working;
and a re-atomization step, acquiring a starting signal newly triggered by a user, and sequentially executing the extraction step and the atomization driving step under the triggering of the new starting signal so as to realize re-extraction of the resonant frequency of the atomization sheet and re-drive the atomization sheet to work.
7. An atomization system for an electronic cigarette, comprising:
the atomization sheet is used for carrying out ultrasonic atomization on tobacco tar in the electronic cigarette;
the narrow pulse signal transmitting module is used for transmitting a narrow pulse signal to the atomizing sheet;
the driving module is used for sending a working signal with the same frequency as the input signal to the atomizing sheet under the driving of the input signal so as to drive the atomizing sheet to work; the input signal comprises the narrow pulse signal and a driving signal; the atomization sheet outputs a self-resonance signal under the driving of a working signal corresponding to the narrow pulse signal;
the processing module is used for controlling the narrow pulse signal transmitting module to transmit the narrow pulse signal under the triggering of the starting signal triggered by the user; and acquiring the self-resonance signal, and carrying out frequency extraction on the self-resonance signal to obtain the resonance frequency of the atomization sheet.
8. The atomization system of claim 7, wherein after the processing module obtains the resonant frequency of the atomization plate, the processing module is further configured to generate a driving signal, send the driving signal to the driving module, and drive the atomization plate to operate through the driving module; and/or the processing module is also used for acquiring a shutdown signal triggered by a user and controlling the atomizing sheet to stop working.
9. A method for driving an ultrasonic atomization sheet of an electronic cigarette, comprising:
a pulse transmitting step of transmitting a narrow pulse signal to the atomizing sheet;
a feedback obtaining step of obtaining a self-resonance signal output by the atomization sheet under the drive of the narrow pulse signal;
and an atomization driving step of intercepting part of the self-resonance signal or copying all the self-resonance signal to obtain a source signal, generating a driving signal according to the source signal and driving the atomization sheet to work.
10. An atomization system for an electronic cigarette, comprising:
the atomization sheet is used for carrying out ultrasonic atomization on tobacco tar in the electronic cigarette;
the narrow pulse signal transmitting module is used for transmitting a narrow pulse signal to the atomizing sheet;
the driving module is used for sending a working signal with the same frequency as the input signal to the atomizing sheet under the driving of the input signal so as to drive the atomizing sheet to work; the input signal comprises the narrow pulse signal and a driving signal; the atomization sheet is driven by a working signal corresponding to the narrow pulse signal to output a self-resonance signal;
the processing module is used for controlling the narrow pulse signal transmitting module to transmit the narrow pulse signal under the triggering of the starting signal triggered by the user; the method comprises the steps of obtaining the self-resonance signal, intercepting part or all of the self-resonance signal to obtain a source signal, generating a driving signal according to the source signal, sending the driving signal to a driving module, and driving the atomizing sheet to work through the driving module.
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