CN205731794U - A kind of ultrasonic atomization sheet frequency sweep circuit - Google Patents
A kind of ultrasonic atomization sheet frequency sweep circuit Download PDFInfo
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- CN205731794U CN205731794U CN201620405394.3U CN201620405394U CN205731794U CN 205731794 U CN205731794 U CN 205731794U CN 201620405394 U CN201620405394 U CN 201620405394U CN 205731794 U CN205731794 U CN 205731794U
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Abstract
The utility model discloses a kind of ultrasonic atomization sheet frequency sweep circuit, including input module, the outfan of input module connects bleeder circuit, bleeder circuit connects filter circuit, the two ends of bleeder circuit are provided with dividing potential drop detection terminal, and filter circuit connects coupling circuit, and the input of coupling circuit is additionally provided with switching signal input circuit, the outfan of coupling circuit is provided with output filter circuit, and output filter circuit connects output module.Circuit of the present utility model is simple, reduces cost, and owing to circuit is made without boosting, efficiency is improved, logical overcoupled circuits, it is possible to the scope making input voltage is more wide in range.
Description
Technical field
This utility model relates to atomizing piece technical field, particularly relates to a kind of ultrasonic atomization sheet frequency sweep circuit.
Background technology
Ultrasonic atomization sheet is to be made up of piezoelectric crystal material and sheet metal, utilize is the piezoelectric effect of crystalline material, applying level at crystalline material 2 end can make crystalline material produce deformation, the excursion of deformation is minimum, therefore the concussion of the physics of extremely high frequency can be produced, shown in the operation principle below figure 1 and Fig. 2 of piezoelectric crystal material.Fig. 1 is that direct piezoelectric effect external force makes crystal produce electric charge, and Fig. 2 is that inverse piezoelectric effect extra electric field makes crystal produce deformation.On any one electrode paste in upper figure, piece of metal thin slice i.e. may make up a ultrasonic atomization sheet, the above principle for ultrasonic atomization sheet.
Ultrasonic atomization sheet presents following characteristics on electrology characteristic:
(1) capacitance characteristic, uses apparatus measures with the presence of electric capacity between 2 electrodes of atomizing piece, and therefore unidirectional current cannot pass through ultrasonic atomization sheet.
(2), there is induction reactance between 2 electrodes of atomizing piece in inductance characteristic, owing to there being the existence of inductance that the alternating current in the range of certain frequency can be hindered to pass through.
The equivalent circuit diagram of ultrasonic atomization sheet is the electric capacity C and inductance L of series connection, and its frequency feature is:
(1) electric capacity C series connection the most therefore atomizing piece 2 end only has alternating current to pass through；
(2) power frequency of atomizing piece 2 end get over the capacitive reactance of high capacitance C can be more and more less；
(3) induction reactance of the power frequency the lowest inductance L of atomizing piece 2 end can be more and more less.
The most as shown in Figure 3, in figure, atomizing piece mid frequency is the intersection of 2 curves, because the electric capacity in equivalent circuit and inductance are series connection, so can be because the capacitive reactance of the induction reactance of inductance or electric capacity increases when frequency departure intersection in the case of voltage is constant when, causing the current reduction flowing through atomizing piece, after electric current drops to certain threshold value, the energy that obtains of atomizing piece is just not enough to produce atomizing effect.Note: above chart is only used as demonstrating use, does not represent actual test data.
Flow through the electric current of ultrasonic atomization sheet and the relation of frequency:
(1) atomizing piece can be made to shake as long as alternating current flows through atomizing piece；
(2) when in the case of voltage is constant the frequency of only alternating current closest to atomizing piece central point when flow through the electric current of atomizing piece and be only maximum, the energy that atomizing piece is obtained just be enough to produce atomizing effect；
(3) according to conclusion (1) if when power frequency not central point at atomizing piece when improve the voltage of electrode and atomizing piece can also be made to obtain enough energy produce water smoke, but can be because the increase of the induction reactance of atomizing piece or capacitive reactance causes atomizing piece own loss to increase, so that efficiency drastically declines, and atomizing piece can seriously generate heat or burn；
(4) can be by changing the frequency of alternating current in the case of voltage is constant, the size measuring alternating current determines the mid frequency of atomizing piece.
Analysis according to atomizing piece characteristic and the Chinese utility model patent of Publication No. CN105049024A, a kind of ultrasonic atomization sheet high accuracy frequency sweep circuit and frequency sweeping method disclosed in it, in place of still suffering from some shortcomings: circuit is more complicated, cost is the most higher, whole efficiency is on the low side, it is impossible to adapt to lower power voltage supply.
Utility model content
The utility model proposes a kind of ultrasonic atomization sheet frequency sweep circuit, solve circuit in prior art more complicated, cost is the most higher, whole efficiency is on the low side, it is impossible to adapt to lower power voltage supply problem.
The technical solution of the utility model is achieved in that
A kind of ultrasonic atomization sheet frequency sweep circuit, including input module, the outfan of input module connects bleeder circuit, bleeder circuit connects filter circuit, the two ends of bleeder circuit are provided with dividing potential drop detection terminal, and filter circuit connects coupling circuit, and the input of coupling circuit is additionally provided with switching signal input circuit, the outfan of coupling circuit is provided with output filter circuit, and output filter circuit connects output module.
Further, input filter capacitor it is provided with between input module and bleeder circuit.
Further, it is provided with isolation circuit between coupling circuit and output filter circuit.
Further, input module includes positive input terminal and negative input terminal, and bleeder circuit is divider resistance, and divider resistance is connected with positive input terminal or negative input terminal.
Further, coupling circuit is transformator or three foot I-shaped inductance.
Further, switching signal input circuit is that the input of audion or controllable silicon or MOSFET, audion or controllable silicon or MOSFET is provided with pwm signal input.
Further, isolation circuit is isolation capacitance.
Further, described output filter circuit is output filter capacitor.
The beneficial effects of the utility model are: circuit is simple, reduces cost, and owing to circuit is made without boosting, efficiency is improved, logical overcoupled circuits, it is possible to the scope making input voltage is more wide in range.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the fundamental diagram of atomizing piece direct piezoelectric effect；
Fig. 2 is the fundamental diagram of atomizing piece inverse piezoelectric effect；
Fig. 3 is the frequency-circuit variation curve chart of atomizing piece；
Fig. 4 is the circuit theory diagrams of this utility model a kind of ultrasonic atomization sheet frequency sweep circuit embodiment one；
Fig. 5 is the circuit theory diagrams of this utility model a kind of ultrasonic atomization sheet frequency sweep circuit embodiment two；
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
As shown in Figure 4, the utility model proposes a kind of ultrasonic atomization sheet frequency sweep circuit, including input module, the outfan of input module connects bleeder circuit, and bleeder circuit connects filter circuit, and the two ends of bleeder circuit are provided with dividing potential drop detection terminal, filter circuit connects coupling circuit, the input of coupling circuit is additionally provided with switching signal input circuit, and the outfan of coupling circuit is provided with output filter circuit, and output filter circuit connects output module.Input filter capacitor it is provided with between input module and bleeder circuit.It is provided with isolation circuit between coupling circuit and output filter circuit.Input module includes positive input terminal and negative input terminal, and bleeder circuit is divider resistance, and divider resistance is connected with positive input terminal or negative input terminal.Coupling circuit is transformator or three foot I-shaped inductance.Switching signal input circuit is that the input of audion or controllable silicon or MOSFET, audion or controllable silicon or MOSFET is provided with pwm signal input.
Specifically, title and the effect of each components and parts in Fig. 4 are as follows:
This point of VDD is the positive pole of input power
This point of VSS is the negative pole of input power
This point of OUT+ connects one of them electrode of ultrasonic atomization sheet
This point of OUT-connects the another one electrode of ultrasonic atomization sheet
This electric capacity of C1 is circuit input filter capacitor, in actual application according to power supply electric power thus supplied can select different capacity or without
This electric capacity of C2 is circuit filtering electric capacity, determines different capacity and pressure according to the difference of power supply electric power thus supplied in actual application, and this electric capacity is that circuit is necessary
This electric capacity of C3 plays the effect of isolated DC, and the capacity of electric capacity and voltage select according to practical situation, this electric capacity can select in certain applications without
This electric capacity of C4 plays the effect of filtering in circuit can significantly reduce high-frequency ac current interference to external world, simultaneously works as preventing the effect of open circuit, its capacity and voltage from selecting according to practical situation atomizing piece is not connected with when
These components and parts of Q1 are NPN type components and parts, can use the switching components such as audion, controllable silicon or MOSFET in actual application, and it act as main switching tube
These components and parts of RS are divider resistance components and parts, it plays the effect of dividing potential drop in circuit, dividing potential drop measurement by these components and parts flows through the electric current of primary lateral coil, the parameter of this resistance can be according to the size of no application regulation resistance, this resistance can also be serially connected in the VSS position of circuit simultaneously, but Q1 can be caused to produce floating ground owing to resistance being serially connected in VSS position, the most not recommend this connection, but this connection is also a kind of deformation of circuit；The method of the branch pressure voltage measuring RS resistance 2 end has multiple, such as, differential amplifier circuit can be used to measure after being amplified by signal, or use special current measurement amplification chip to measure, not enumerate.
These components and parts of T1 are a typical transformator, flow through alternating current by the coil between primary side 1-2 pin and make to produce between primary side 3-4 pin couple current, the height of primary side output voltage can be changed by changing the turn ratio of coil between primary side and primary side
This position of V1 is that dividing potential drop measures point 1
This position of V2 is that dividing potential drop measures point 2
This position input switch signal of PWM
The PWM position input of above circuit breaker in middle pipe is close to the switching signal of atomizing piece mid frequency, the primary side of transformator flows through electric current, the primary side of transformator has couple current and flows through, this electric current flows through atomizing piece makes atomizing piece produce concussion, then pressure reduction can be produced at 2 ends of resistance owing to electric current flows through sampling resistor RS, by measuring the pressure reduction of sampling resistor 2 end it is known that flow through the size of current of transformer coil primary side, simultaneously because the coupling of transformator is simultaneously it will also be appreciated that the size of current that flows through of transformer coil primary side.
As it is shown in figure 5, the above circuit of this utility model has multiple deformation occurs that the method carrying out for example with three foot I-shaped inductance coupling employs 3 foot I-shaped inductance in this application and instead of transformator, its principle is as good as with transformator.
Frequency sweep process of the present utility model comprises the following steps:
(1) switching signal input circuit drives according to original frequency incoming frequency；
(2) measure and record the pressure reduction between dividing potential drop detection terminal；
(3) incoming frequency of switching signal input circuit is changed, it may be judged whether reach the cut-off frequency set, if it is not, then repeat step (2), the most then enter next step；
(4) determine the maximum differential pressure between dividing potential drop detection terminal, the incoming frequency of the switching signal input circuit of its correspondence is designated as the mid frequency of atomizing piece.
Further, step (2) is
(2) measure and record the pressure reduction between dividing potential drop detection terminal or measurement and record flows through the electric current of divider resistance；
(3) incoming frequency of switching signal input circuit is changed, it may be judged whether reach the cut-off frequency set, if it is not, then repeat step (2), the most then enter next step；
(4) determine that the maximum differential pressure between dividing potential drop detection terminal or selection flow through the maximum current of divider resistance, the incoming frequency of the switching signal input circuit of its correspondence is designated as the mid frequency of atomizing piece.
Further, further comprising the steps of:
(5) operating current when monitoring atomizing piece works with mid frequency, if the difference between current of operating current and maximum current is 30%-50%, then judges that atomizing piece is in hydropenia duty.
Further, further comprising the steps of:
(6) switching signal input circuit stops input.
nullIn the case of the mid frequency of atomizing piece is 110Khz，Choose the 100Khz initial frequency as frequency sweep，120Khz is as the end frequency of frequency sweep，Or in the case of the mid frequency of atomizing piece is 1.7Mhz，Choose the 1.6Mhz initial frequency as frequency sweep，1.8Mhz is as the end frequency of frequency sweep，Then start to progressively increase from initial frequency，Such as increase 1Khz or 0.01Mhz，Increase by one grade of frequency every time and all can measure and record sampling resistor dividing potential drop data，Namely measure and the size of record current，Just all current data that recorded are contrasted when frequency increases end frequency when，The incoming frequency that the maximum current point that wherein screens is corresponding is exactly the mid frequency of ultrasonic atomization sheet，Or the mid frequency closest to ultrasonic atomization sheet.
Additionally, find above circuit is tested when: when atomizing piece atomizing piece its operating current in the case of contacting water and being not in contact with water working with mid frequency when differs greatly, the difference between current of about 30% to 50% away from, therefore according to this characteristic, hydropenia can be judged whether by the size of real-time monitor current normal work when, if curent change exceedes certain threshold value the most at work is it is believed that atomizing piece is in hydropenia duty, just the input of pwm signal can be stopped, realization has water i.e. to work, and anhydrous i.e. stops.
This frequency sweeping method has following advantage with frequency sweeping method before contrasts:
(1) circuit reduction cost has obtained further reduction；
(2) input voltage range is more wide in range, has only to when input voltage difference change coil primary and secondary turn ratio；
(3) it is greatly improved relative to 2 grades of booster circuit efficiency before owing to circuit is made without boosting, overall power have dropped 30%, and almost without power consumption in the case of circuit is idle, it is best suitable for needing the most standby mobile series products to apply；
(4) when of frequency sweep, the stability of circuit is higher, and the precision of frequency sweep can improve further.
The foregoing is only preferred embodiment of the present utility model; not in order to limit this utility model; all within spirit of the present utility model and principle, any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.
Claims (8)
1. a ultrasonic atomization sheet frequency sweep circuit, it is characterised in that: include input module, described input mould
The outfan of block connects bleeder circuit, and described bleeder circuit connects filter circuit, described bleeder circuit
Two ends are provided with dividing potential drop detection terminal, and described filter circuit connects coupling circuit, the input of described coupling circuit
End is additionally provided with switching signal input circuit, and the outfan of described coupling circuit is provided with output filter circuit, described
Output filter circuit connects output module.
A kind of ultrasonic atomization sheet frequency sweep circuit the most according to claim 1, it is characterised in that: described
It is provided with input filter capacitor between input module and described bleeder circuit.
A kind of ultrasonic atomization sheet frequency sweep circuit the most according to claim 1, it is characterised in that: described
It is provided with isolation circuit between coupling circuit and described output filter circuit.
A kind of ultrasonic atomization sheet frequency sweep circuit the most according to claim 2, it is characterised in that: described
Input module includes that positive input terminal and negative input terminal, described bleeder circuit are divider resistance, described
Divider resistance is connected with described positive input terminal or negative input terminal.
A kind of ultrasonic atomization sheet frequency sweep circuit the most according to claim 4, it is characterised in that: described
Coupling circuit is transformator or three foot I-shaped inductance.
A kind of ultrasonic atomization sheet frequency sweep circuit the most according to claim 5, it is characterised in that: described
Switching signal input circuit is audion or controllable silicon or MOSFET, described audion or controllable silicon or
The input of MOSFET is provided with pwm signal input.
A kind of ultrasonic atomization sheet frequency sweep circuit the most according to claim 3, it is characterised in that: described
Isolation circuit is isolation capacitance.
A kind of ultrasonic atomization sheet frequency sweep circuit the most according to claim 5, it is characterised in that: described
Output filter circuit is output filter capacitor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620405394.3U CN205731794U (en) | 2016-05-05 | 2016-05-05 | A kind of ultrasonic atomization sheet frequency sweep circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620405394.3U CN205731794U (en) | 2016-05-05 | 2016-05-05 | A kind of ultrasonic atomization sheet frequency sweep circuit |
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| CN205731794U true CN205731794U (en) | 2016-11-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105772312A (en) * | 2016-05-05 | 2016-07-20 | 深圳市尚进电子科技有限公司 | Ultrasonic aromatization sheet frequency sweep circuit and method |
| CN110657859A (en) * | 2019-09-29 | 2020-01-07 | 广东科高电器有限公司 | Waterless dry-burning detection circuit |
-
2016
- 2016-05-05 CN CN201620405394.3U patent/CN205731794U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105772312A (en) * | 2016-05-05 | 2016-07-20 | 深圳市尚进电子科技有限公司 | Ultrasonic aromatization sheet frequency sweep circuit and method |
| CN110657859A (en) * | 2019-09-29 | 2020-01-07 | 广东科高电器有限公司 | Waterless dry-burning detection circuit |
| CN110657859B (en) * | 2019-09-29 | 2021-12-10 | 广东科高电器有限公司 | Waterless dry-burning detection circuit |
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