CN108802529A - A kind of fast determination method of atomizer transduction piece resonance point - Google Patents
A kind of fast determination method of atomizer transduction piece resonance point Download PDFInfo
- Publication number
- CN108802529A CN108802529A CN201810607339.6A CN201810607339A CN108802529A CN 108802529 A CN108802529 A CN 108802529A CN 201810607339 A CN201810607339 A CN 201810607339A CN 108802529 A CN108802529 A CN 108802529A
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- Prior art keywords
- frequency
- transduction piece
- transduction
- feedback voltage
- point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
- B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
- B05B17/0653—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Special Spraying Apparatus (AREA)
Abstract
The present invention provides a kind of fast determination methods of atomizer transduction piece resonance point, it is related to electronic information field, determine that atomizer changes the optimum resonance point of transduction piece using dichotomy when powering on use for the first time, corresponding resonant frequency is stored in reservoir, using the resonant frequency as the working frequency of switching signal when hereafter powering on, without carrying out reanalysing detection to transduction piece during circuit use.Adaptation is identified in the individual difference that the present invention can effectively be directed to atomizer transduction piece, ensure that the usage experience each time of each user or user are same or like, it greatly shortens and powers on the required frequency sweep time for the first time, the optimum frequency for measuring gained is stored in register, it eliminates and powers on the process for being required for frequency sweep every time, it is not related to the modification of hardware aspect, i.e. on the basis of existing universal circuit, without largely being changed circuit, it can easily realize, greatly save production cost.
Description
Technical field
The present invention relates to electronic information field, the determination method of optimum frequency in especially a kind of circuit.
Background technology
The spray technique of the existing upper one-hundred-year history of use of spray technique, early stage is chiefly used in agricultural and industrial production, such as
The operations such as pesticide spraying, gard watering, surface lacquer.Liquid atomization technique before 10 years is mainly by the way of pressurization, i.e.,
Have one and be put into liquid in the closed container of both ends open, is open from one of them and high pressure gas is pressurizeed or be filled with into container,
Another opening valve is opened after the pressure in container reaches desirable value, this opening water outlet is a micropore, and high pressure water flow passes through
Water mist can be formed by breaing up when micropore, to realize the effect of liquid atomization.This atomization technique is prevailing for many years, so far one
Such atomization technique can be still used in the agricultural production in a little areas, but there are manpower or a large amount of waves of other energy for the program
Take, and the security risk brought by high pressure gas, all so that this technology is eliminated rapidly in the new century.
It is exactly the existing frequently-used atomization system manufactured using piezoelectric material, the core of atomizer to replace the technology of pressurizing atomizing
Heart component is micropore atomization piece, i.e., transduction piece of the present invention, and operation principle is at the both ends of atomizing piece plus certain frequency
The alternating voltage of rate makes atomizing piece starting of oscillation, high frequency oscillation smash hydrone and generate water mist and come out water mist spray.
This atomization technique is more perfect at this stage technology, and the conversion ratio of energy and the uniformity coefficient of water mist all far win
In traditional pressurizing atomizing technology, this technology is widely used in the fields such as beauty, medical treatment, and industry particularity requires atomization
Device can smash hydrone diameter to Nano grade, so the working frequency and homogeneity of product to atomizer are more demanding.
In theory, the control signal frequency in circuit is consistent with the frequency optimum traffic of transduction piece, i.e., should reach best effort shape
State.But during the actual manufacturing, due to the property of transduction piece itself and the limitation of production technology, cause each
A actual frequency optimum traffic point of transduction piece is not accurately design value, knows it is in desired value by test data and knowhow
The normal distribution of both sides, therefore do not ensure that each circuit can form best oscillation on identical switching frequency and return
Road.
For the above problem, the atomizer product sold on current market mainly uses two kinds of counte-rplan：It is more simple
This problem is ignored in single atomization moisturizing instrument selection, and memory directly is written as switching frequency in calculated resonant frequency
In, on the one hand circuit structure can be simplified by doing so, save and design and produce cost, be on the other hand that can reach powering on
When, including moment start-up operation when powering on for the first time, there is good user experience in this respect.Other more high-end atomizations
Device product support dynamic frequency more new solution, i.e. every equipment can realize that basis is changed by frequency sweep operation after the power is turned on
Can piece difference and update the frequency of switching circuit, achieve the purpose that optimum resonance, in this way can be adaptively due to transduction piece
The problem of different sizes of water mist caused by individual difference ensure that the consistency of product and identical user experience, but at this stage
Sweep frequency technique there are problems that frequency sweep overlong time, need after the power is turned on wait for the long period can normal use, it is serious in this way
Affect user experience.
Invention content
For overcome the deficiencies in the prior art, occur in the production and use process for frequency sweep atomizer at this stage upper
Problem is stated, the present invention proposes a kind of new solution, is primarily implemented in when powering on use for the first time and quickly determines that atomizer changes
The resonance point of transduction piece so that user is when first used without waiting, you can effective atomizing effect is stablized in acquisition.
The detailed step of the technical solution adopted by the present invention to solve the technical problems is as follows：
Step a)：By the data sheet of model transduction piece selected by access, the selected model transducing of simultaneous selection 200
Piece, and the frequency optimum traffic point of 200 transduction pieces is measured, obtain one group of frequency optimum traffic for including 200 transduction pieces
Data, and choose dot frequency value F centered on the mode of this group of data, if mode is more than or equal to two, then increases one by one and change
Energy piece and the frequency optimum traffic point for measuring increased transduction piece, until the Frequency point mode of the transduction piece of all measurements only has one
Until a；
Step b)：Central point frequency value F measured in step a) is stored in the register of Logic control module, and led to
Overdrive circuit sends switching signal, dot frequency value F centered on the frequency values of signal, while obtaining booster circuit feedback voltage level
Vfb0；
Step c)：Adjusting Logic control module working frequency is (F+1) kHz, obtains booster circuit feedback voltage level Vfb1,
If feedback voltage level Vfb1 is less than feedback voltage level Vfb0 at this time, the optimum resonance point of transduction piece center frequency value F it
On, if feedback voltage level Vfb1 on the contrary is more than feedback voltage level Vfb0, the resonance point of transduction piece is under center frequency value F；
If measured Vfb1 is equal with feedback voltage level Vfb0, F is chosen as resonant frequency；
Step d)：From central point to corresponding orientation measurement on the direction that step c) is determined, i.e., such as transduction piece is best humorous
It shakes a little on center frequency value F, then continues growing working frequency, increase 1kHz every time, if the resonance point of transduction piece is at center
Under frequency value F, then continues to reduce working frequency, reduce 1kHz every time；
Step e)：Feedback voltage level Vfb constantly declines, and minimum occurs when Logic control module measures feedback voltage Vfb,
Then the working frequency of the switching signal corresponding to minimum is the best operating point of atomizing piece, i.e. resonant frequency；
Step f)：The resonant frequency of the step e) transduction pieces determined is stored in reservoir, with the resonance frequency when hereafter powering on
Rate is the working frequency of switching signal, without carrying out reanalysing detection to transduction piece during circuit use.
The beneficial effects of the present invention are：
Adaptation is identified in the individual difference that the present invention can effectively be directed to atomizer transduction piece, and takes improved calculation
Method so that each atomizer can be operated in optimum resonant frequency point nearby (within error 2 ‰), it is ensured that each user
Or the usage experience each time of user is same or like.
Pass through introduce centre frequency mensuration so that the required frequency sweep time be reduced to the 10% of existing solution with
It is interior, greatly shorten and power on the required frequency sweep time for the first time so that user when first powering on without long waiting when
Between can normal use atomizer, effectively optimize usage experience.
The optimum frequency for measuring gained is stored in register, you can the frequency is directly invoked in booting later,
Eliminate and power on the process for being required for frequency sweep every time, i.e., in addition to first powering on each booting can in optimum resonant frequency work
Make.
Due to being the improvement on frequency sweeping method, the modification of hardware aspect it is not related to substantially, i.e., in existing universal circuit
On the basis of, without largely being changed circuit, you can easily realize, greatly saved production cost.
Description of the drawings
Fig. 1 is the circuit diagram of the embodiment of the present invention.
Fig. 2 is the circuit diagram in the embodiment of the present invention.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples.
Step a)：By the data sheet of model transduction piece selected by access, the selected model transducing of simultaneous selection 200
Piece, and the frequency optimum traffic point of 200 transduction pieces is measured, obtain one group of frequency optimum traffic for including 200 transduction pieces
Data, and choose dot frequency value F centered on the mode of this group of data, if mode is more than or equal to two, then increases one by one and change
Energy piece and the frequency optimum traffic point for measuring increased transduction piece, until the Frequency point mode of the transduction piece of all measurements only has one
Until a；
Step b)：Central point frequency value F measured in step a) is stored in the register of Logic control module, and led to
Overdrive circuit sends switching signal, dot frequency value F centered on the frequency values of signal, while obtaining booster circuit feedback voltage level
Vfb0；
Step c)：Adjusting Logic control module working frequency is (F+1) kHz, obtains booster circuit feedback voltage level Vfb1,
If feedback voltage level Vfb1 is less than feedback voltage level Vfb0 at this time, the optimum resonance point of transduction piece center frequency value F it
On, if feedback voltage level Vfb1 on the contrary is more than feedback voltage level Vfb0, the resonance point of transduction piece is under center frequency value F；
If measured Vfb1 is equal with feedback voltage level Vfb0, by the property of central distribution it is found that the optimum resonance of required transduction piece
Point is between frequency FkHz and (F+1) kHz, and since stepping length is only 1kHz, then frequency F or (F+1kHz) can be used as
Frequency optimum traffic, not cause difference, it is optimum resonance point that smaller value is uniformly chosen when this occurs, i.e., chooses herein
F is as optimum resonance point.
Step d)：Frequency optimum traffic section is determined by step c), you can the section to be measured for excluding half, due to transducing
Normal distribution is presented in the resonance potential point of piece, then, only need to be in step by properties of normal distribution it is found that dichotomy need not be reused
From central point to corresponding orientation measurement on rapid direction c) determined, i.e., if the optimum resonance point of transduction piece is in center frequency value F
On, then working frequency is continued growing, increases 1kHz every time, if the resonance point of transduction piece is under center frequency value F, is then continued
Reduce working frequency, reduces 1kHz every time；
Step e)：The resonance circuit working frequency of atomizer will be got over closer to optimum resonant frequency, the impedance of atomizing piece
Small, the decline of atomizing piece impedance can cause transduction piece both end voltage value to decline, and then feedback voltage level Vfb can also decline, when patrolling
Volume control module measures feedback voltage Vfb and minimum occurs, then the working frequency of the switching signal corresponding to minimum is mist
Change the best operating point of piece, i.e. resonant frequency；
Step f)：The resonant frequency of the step e) transduction pieces determined is stored in reservoir, with the resonance frequency when hereafter powering on
Rate is the working frequency of switching signal, without carrying out reanalysing detection to transduction piece during circuit use.
Fig. 1 and Fig. 2 is a kind of circuit diagram of typical case of the present invention, since the present invention is mainly a kind of novel measurement
Method, it is not fairly obvious to be distinguished with conventional atomizers circuit on tandem circuit, therefore does not provide other in attached drawing of the present invention
The schematic diagram of circuit.As shown in Fig. 1, circuit includes mainly following sections main modular：Including charging module, boosting mould
Block, Logic control module and corresponding peripheral circuit.The present invention is the novel acquisition methods of transduction piece resonance point, therefore right
It is only described briefly in other modules.It is mentioned in the description of background technology, atomizer a important application is mist at this stage
Change device moisturizing instrument, carries in order to facilitate user and take at any time, the present chargeable design of product generally use, present invention reality
It is part work, the 5V voltages inputted using USB charger that 18650 rechargeable batteries, charging module are selected in example
The needs of charging, can meeting several days of user's normal use.Boost module is traditional voltage-mode Boost type DC-DC moulds
The 4.2V voltages of rechargeable battery output are carried out buck processing, reach voltage value needed for each section circuit by block.Logic control mould
Block is responsible for sending stable clock signal, and adjusts the PWM waveform etc. of circuit.And in the circuit structure on the right side of schematic diagram,
The part in upper right side is LC resonant tanks of the present invention, and the transduction piece of atomizer can regard a capacitor element as, with
The inductance L specified in circuit constitutes circuit, and the pwm signal provided by Logic control module is controlled.Main description below
The operation principle and working method of the method for the present invention.
First, the major function of atomizer of the present invention is a nanometer moisturizing instrument, that is, needs pure water smashing title water mist, be able to
It across the cuticula of skin, is directly absorbed by the skin, is effectively accomplished expected moisturizing effect.According to hydrone diameter and skin
Medical data is calculated, and the frequency of oscillation needed should be greater than 100kHz, and this other alternating current circuit of frequency level can not use coil
It is given birth in magnetic field transfer movable property, therefore the present invention is realized by the way of transduction piece.
But in actual production application, due to component production technology limitation and control production cost demand,
So that the capacitance and inductance component selected have more or less error, because of the presence of these errors, every atomizer it is humorous
It shakes and is a little not in identical position, therefore cause the atomizing effect of every atomizer after appearing on the scene irregular, this is clearly
It is unacceptable.For this problem, for processing scheme now substantially by two kinds, one is exactly to turn a blind eye to this problem,
Research and development and production cost can be saved by doing so, and make user in (including booting powers on for the first time) moment of booting each time
Can normal use atomizer, but this is clearly worthless.Another scheme proposes the detection to atomizer resonance point,
By the detection before powering on, the exact value of optimum resonance point is obtained, reaches good atomizer using effect, equally exists
Problem, such as required detection time are long, and the waiting after being switched on each time reduces usage experience etc..
The present invention is detected the resonance point of every atomizer, and corresponding pwm control signal is given by control module,
So that the atomizing effect and atomization quantity of every atomizer reach same or like level.It can by the property of atomizer transduction piece
Know, when concussion frequency of the switching signal of circuit close to atomizer transduction piece itself, the impedance of transduction piece itself declines,
Constant power output is carried out to circuit during frequency detecting, then when the impedance of atomizer declines, the electric current flowed through increases, then
The voltage value of corresponding feedback circuit can then decline, therefore can be by detecting voltage value, when the voltage value of measurement point reaches most
Hour, oscillating circuit can be considered at optimum resonance working condition.Specific operation is as follows：
Pass through the circuit design of early period and the measurement in later stage and the analysis of component industry characteristics, the resonance of atomizer
Point forms Gaussian Profile in 110kHz or so.Analysis data distribution it is found that most of resonance point to be centrally located value attached
Closely, therefore dichotomy, the corresponding voltage value of frequency values of preferential measuring center point, that is, both sides, you can quickly and effectively are considered as
Detect the optimum resonance point of atomizer.
As seen from the above analysis, when atomizer reaches optimum resonant frequency, the impedance of transduction piece is minimum, i.e., added measurement point
Voltage value it is minimum, therefore voltage value V2 when voltage value V1 and 111kHz when measurement frequency is 110kHz first, at this time：
If V1<V2, then 110kHz is closer to optimum resonance point, you can stepping 1kHz is measured every time downwards, voltage value Ying Ji
It is continuous to reduce, when the voltage value for measuring certain point starts to increase, former point be needed for optimum resonance dot frequency.
If V1>V2, then 111kHz is closer to optimum resonance point, you can stepping 1kHz is measured every time upwards, voltage value Ying Ji
It is continuous to reduce, when the voltage value for measuring certain point starts to increase, former point be needed for optimum resonance dot frequency.
If V1=V2, the frequency optimum traffic of transduction piece then both can be used as between 110kHz and 111kHz
Frequency optimum traffic point, to avoid register from malfunctioning, the unified smaller value chosen between the two is as most when there is such case
It is excellent.
It is that can determine the frequency (error 0.5kHz) of optimum resonance point by above step, by measured resonance point
Frequency values are stored in control module, directly invoke the frequency when booting powers on later, you can obtain good using effect.
Claims (1)
1. a kind of fast determination method of atomizer transduction piece resonance point, it is characterised in that include the following steps：
Step a)：By the data sheet of model transduction piece selected by access, the selected model transduction piece of simultaneous selection 200, and
The frequency optimum traffic point for measuring 200 transduction pieces obtains the number of one group of frequency optimum traffic comprising 200 transduction pieces
According to, and dot frequency value F centered on the mode of this group of data is chosen, if mode is more than or equal to two, then increase transduction piece one by one
And the frequency optimum traffic point of increased transduction piece is measured, until only there are one be the Frequency point mode of the transduction piece of all measurements
Only；
Step b)：Central point frequency value F measured in step a) is stored in the register of Logic control module, and passes through drive
Dynamic circuit sends switching signal, dot frequency value F centered on the frequency values of signal, while obtaining booster circuit feedback voltage level
Vfb0；
Step c)：Adjusting Logic control module working frequency is (F+1) kHz, obtains booster circuit feedback voltage level Vfb1, if this
When feedback voltage level Vfb1 be less than feedback voltage level Vfb0, then the optimum resonance point of transduction piece is on the contrary on center frequency value F
If feedback voltage level Vfb1 is more than feedback voltage level Vfb0, the resonance point of transduction piece is under center frequency value F；If measured
Vfb1 is equal with feedback voltage level Vfb0, chooses F as resonant frequency；
Step d)：From central point to corresponding orientation measurement on the direction that step c) is determined, i.e., such as the optimum resonance point of transduction piece
On center frequency value F, then working frequency is continued growing, increases 1kHz every time, if the resonance point of transduction piece is in centre frequency
Under value F, then continues to reduce working frequency, reduce 1kHz every time；
Step e)：Feedback voltage level Vfb constantly declines, and minimum occurs when Logic control module measures feedback voltage Vfb, then most
The working frequency of switching signal corresponding to low value is the best operating point of atomizing piece, i.e. resonant frequency；
Step f)：The resonant frequency of the step e) transduction pieces determined is stored in reservoir, is with the resonant frequency when hereafter powering on
The working frequency of switching signal, without carrying out reanalysing detection to transduction piece during circuit use.
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Cited By (3)
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| CN111438026A (en) * | 2020-03-25 | 2020-07-24 | 广州厚达电子科技有限公司 | Driving method and driving circuit of ultrasonic atomizer |
| CN111596581A (en) * | 2020-04-24 | 2020-08-28 | 深圳麦克韦尔科技有限公司 | Dry burning prevention method and device for atomizer, atomizer and storage medium |
| WO2024061166A1 (en) * | 2022-09-22 | 2024-03-28 | 深圳市合元科技有限公司 | Ultrasonic atomizer, and resonant-frequency determination method based on ultrasonic atomizer |
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Application publication date: 20181113 |