CN204906355U - Ultrasonic atomization piece high accuracy frequency sweep circuit - Google Patents
Ultrasonic atomization piece high accuracy frequency sweep circuit Download PDFInfo
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- CN204906355U CN204906355U CN201520587095.1U CN201520587095U CN204906355U CN 204906355 U CN204906355 U CN 204906355U CN 201520587095 U CN201520587095 U CN 201520587095U CN 204906355 U CN204906355 U CN 204906355U
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Abstract
The utility model discloses an ultrasonic atomization piece high accuracy frequency sweep circuit, including boost circuit and frequency sweep circuit, boost circuit is connected with the frequency sweep circuit electricity, the utility model is suitable for a various ultrasonic atomization piece measurement of frequencies and drive, do not need to measure based on pulse signal's peak, consequently can carry out other ultrasonic atomization piece of megahertz level frequency scanning, need the compensation not be distinguished to the atomizing piece of different models, arbitrary ultrasonic atomization piece can be driven.
Description
Technical field
The utility model relates to atomizing piece field, refers to a kind of ultrasonic atomization sheet high accuracy frequency sweep circuit especially.
Background technology
Ultrasonic ultrasonic delay line memory utilizes electronics high frequency oscillation, and (frequency of oscillation is 1.7MHz or 2.4MHz, exceed the audibility range of people, this electronic absolutely not injures human body and animal), by the high-frequency resonant of ceramic atomizing piece, liquid water molecules structure broken up and produces the elegant water smoke of nature, then by small fan, mist being blowed to outlet from bottom, make with the humid air and that association is abundant negative oxygen ion, energy fresh air, improves health, builds comfortable environment.
Because existing manufacturing technology is uneven, cause producers different in the market with batch ultrasonic atomization sheet center resonant frequency different, if when driving its work driving frequency be not its center resonant frequency can cause atomizing piece conversion efficiency under and atomization quantity is minimum.
Utility model content
The utility model proposes a kind of ultrasonic atomization sheet high accuracy frequency sweep circuit and frequency sweeping method, the center resonant frequency of atomizing piece can be determined, thus determine the driving frequency driving atomizing piece work, and then improve conversion efficiency and the atomization quantity of atomizing piece.
The technical solution of the utility model is achieved in that a kind of ultrasonic atomization sheet high accuracy frequency sweep circuit, comprise booster circuit and frequency sweep circuit, booster circuit is electrically connected with frequency sweep circuit, and booster circuit comprises the 4th electric capacity, diode, the second inductance, the second triode, the first resistance and the second resistance; 4th electric capacity and diode all in parallel with DC power supply, the negative pole pin of diode is connected with the positive pole of DC power supply, and be connected with one end of the second inductance, the other end of the second inductance connects drain electrode and first resistance of the second triode, first resistance and the second resistance serial connection, the source electrode of the second triode is connected the negative pole of DC power supply with the second resistance.
Further, frequency sweep circuit comprises the first electric capacity, the second electric capacity, the 3rd electric capacity, the first inductance, the first triode and atomizing piece; Second electric capacity and the first resistance and the second resistor coupled in parallel, the positive pole of the second electric capacity connects the first inductance, and the other end of the first inductance connects drain electrode and first electric capacity of the first triode; First electric capacity, atomizing piece and the 3rd capacitance series, the 3rd electric capacity is connected with the source electrode of the second electric capacity and the first triode respectively.The grid of the first triode is frequency reception point, and its frequency duty ratio is more than or equal to 50%.
Further, the serial connection point of the first resistance and the second resistance is Voltage Feedback point, Voltage Feedback point is used for the change of recording voltage value when frequency sweep, Voltage Feedback point is when normal work for adjusting the incoming frequency of the grid of the second triode, and the duty ratio of incoming frequency is 20%-60%.
Further, the first triode and the second triode are N channel field-effect pipe.
The beneficial effects of the utility model are:
1, improve the precision of ultrasonic atomization sheet circuit frequency sweep, and measurement and the driving of various ultrasonic atomization sheet frequency can be applicable to widely;
2, because do not need the peak based on pulse signal to measure, the ultrasonic atomization sheet frequency scanning of megahertz rank can therefore be carried out;
3, do not need to carry out difference to the atomizing piece of different model compensate for, therefore can any ultrasonic atomization sheet of driving truly.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram of ultrasonic atomization sheet high accuracy frequency sweep circuit in prior art;
Fig. 2 is the flow chart of ultrasonic atomization sheet high accuracy frequency sweeping method in prior art;
Fig. 3 is the circuit diagram of a kind of ultrasonic atomization sheet of the utility model high accuracy frequency sweep circuit;
Fig. 4 is the flow chart of a kind of ultrasonic atomization sheet of the utility model high accuracy frequency sweeping method;
Fig. 5 is the voltage change curve figure of the Voltage Feedback point that the utility model is measured.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1; W1 in figure represents ultrasonic atomization sheet; because the characteristic of ultrasonic atomization sheet can adopt electric capacity to represent; ultrasonic atomization sheet is equivalent to the electric capacity under characteristic frequency; C1, C3 in figure are equal to a resistance when circuit is in PWM AC signal; there are 2 effects in this circuit; one is prevent direct voltage to be added in atomizing piece two ends; protection atomizing piece can not burn; two is in alternating current circuit, be equivalent to 2 resistance, can be adjusted the atomization quantity size of atomizing piece by adjustment amount of capacity.To the frequency of the grid input 90-130KHz of the triode in circuit, and increase progressively in units of 1KHz from 90KHz, its circuit working principle is as follows:
1, one-period, Q1MOS pipe is opened, and electric current is by L1, Q1, RS1, and now L1 starts energy storage;
2, second period, Q1MOS pipe is closed, the fault offset that L1 stores, and electric current flows into W1, W1 and starts energy storage;
3, the 3rd cycle, Q1MOS pipe is opened, electric current is by L1, Q1, RS1, and now L1 starts energy storage, the energy that W1 stores simultaneously starts back through Q1, RS1, carry out fault offset and now can produce a voltage peak higher than normal switch in the FB position of resistance RS1, utilize the voltage divider principle of resistance, the voltage peak now on FB position is that the electric current releasing energy common by L1 energy storage and W1 produces;
4, the 4th cycle, second period, Q1MOS pipe is closed, the fault offset that L1 stores, and electric current flows into W1, W1 and again starts energy storage.
Fig. 2 is the flow chart of ultrasonic atomization sheet high accuracy frequency sweeping method in prior art, complete work period is illustrated in figure, we constantly adjust the frequency of PWM in this process, it is also maximum that ultrasonic atomization sheet has a feature to be the energy that it stores when atomizing piece is in centre frequency, therefore FB goes out when the central point of atomizing piece voltage can be in peak when we adjust PWM frequency time, utilize this principle PWM frequency now when peak appears in FB to be exactly the centre frequency of atomizing piece.Then just atomizing piece is driven with this frequency.
But the frequency of the maximum point of the atomizing piece energy storage of some manufacturer production is not the centre frequency of atomizing piece, about deviation has about 2-5KHz, therefore the product for different manufacturers is needed to carry out frequency compensation, this results in and cannot carry out extensive trial assembly, speed reason simultaneously owing to gathering FB point voltage causes being merely able to scan within 200KHz, and the atomizing piece that cannot carry out 2MHz frequency carries out automatic frequency sweep.
For the shortcoming of prior art, the utility model improves circuit, as shown in Figure 3, driving voltage due to ultrasonic atomization sheet needs to reach more than 60V, actual supply power voltage generally all only has 5-12V, if " DRIVE " is although the circuit of part can form a booster circuit after directly using, driving voltage is far less than 60V.Therefore generally adopt high voltage drive, so the input voltage of " HIDC-VIN " part of original method is all about 24V usually, this voltage is all reached by boosting IC; D1, L2, Q2 in figure constitute a complete DC-DC booster circuit, only need can boost to the frequency of " DC-PWM " port one 00KHz, and constitute a feedback circuit by R1, R2 dividing potential drop feedback, realize voltage stabilization by feedback adjusting " DC-PWM ".
When input voltage is 5V time, the electrical voltage point that booster circuit obtains is 20V, now " DRIVE " circuit part starts to carry out frequency sweep, when the frequency of frequency sweep slowly starts the central point close to the frequency of atomizing piece time, the power consumption of " DRIVE " partial circuit starts to increase, duty ratio is increased gradually in order to keep DC-DC boosting stable " DC-PWM ", until maximum duty cycle 60% (DC-DC boosting maximum duty cycle generally only has 60%, and details can consult the data of domestic and international associated DC-DC boost control circuit), when the frequency of atomizing piece starts close to centre frequency time, the power of booster circuit part has been increased to maximum, that is booster circuit is in saturation condition, so when frequency further close to when atomizing piece central point because the power of booster circuit is inadequate, the voltage of " C2 " capacitance cathode starts to reduce, and the voltage signal that " DC-FB " feeds back also starts to reduce, until the frequency center point voltage that now " DC-FB " place feeds back that frequency arrives atomizing piece is in minimum point, subsequently along with the frequency of carrying out of frequency sweep departs from the centre frequency of atomizing piece again, now the voltage at " DC-FB " place also gos up again.
Based on above-mentioned discovery, as shown in Figure 3, the utility model proposes a kind of practicality and ultrasonic atomization sheet high accuracy frequency sweep circuit with low cost, comprise booster circuit and frequency sweep circuit, booster circuit is electrically connected with frequency sweep circuit, and booster circuit comprises the 4th electric capacity, diode, the second inductance, the second triode, the first resistance and the second resistance; 4th electric capacity and diode all in parallel with DC power supply, the negative pole pin of diode is connected with the positive pole of DC power supply, and be connected with one end of the second inductance, the other end of the second inductance connects drain electrode and first resistance of the second triode, first resistance and the second resistance serial connection, the source electrode of the second triode is connected the negative pole of DC power supply with the second resistance.Frequency sweep circuit comprises the first electric capacity, the second electric capacity, the 3rd electric capacity, the first inductance, the first triode and atomizing piece; Second electric capacity and the first resistance and the second resistor coupled in parallel, the positive pole of the second electric capacity connects the first inductance, and the other end of the first inductance connects drain electrode and first electric capacity of the first triode; First electric capacity, atomizing piece and the 3rd capacitance series, the 3rd electric capacity is connected with the source electrode of the second electric capacity and the first triode respectively.The grid of the first triode is frequency reception point, and its frequency duty ratio is more than or equal to 50%.The serial connection point of the first resistance and the second resistance is Voltage Feedback point, Voltage Feedback point is used for the change of recording voltage value when frequency sweep, Voltage Feedback point is when normal work for adjusting the incoming frequency of the grid of the second triode, and the duty ratio of incoming frequency is 20%-60%.First triode and the second triode are N channel field-effect pipe.When known input voltage is 5V, the power that booster circuit provides when the duty ratio of " DC-PWM " is constant and frequency is constant is constant, the voltage of power consumption larger " DC-FB " the place feedback of this time " DRIVE " circuit is lower, when " DRIVE " circuit starts frequency sweep time, we constantly monitor the voltage at " DC-FB " place, and when the voltage at " DC-FB " place is in minimum point time, corresponding frequency is exactly the centre frequency of atomizing piece.
As shown in Figure 4, carry out frequency sweeping method based on a kind of ultrasonic atomization sheet high accuracy frequency sweep circuit, frequency sweep process comprises the following steps:
(1) to the fixing direct voltage of booster circuit input and fixed frequency;
Being specially of step (1):
(101) DC power supply booster circuit is connected and fixed; The magnitude of voltage of DC power supply can be set as 5V in the present embodiment;
(102) to grid input fixed frequency, the such as 100KHz of the second triode, in step (1), the fixed duty cycle of the incoming frequency of booster circuit is 20%-60%.Duty ratio refers to the time ratio that high level is shared in one-period, and the duty ratio as square wave is 50%, and duty ratio is 0.5, and the time shared by positive level that illustrates is 0.5 cycle.
(2) to frequency sweep circuit input 90KHz frequency drives; Step (2) is specially the grid input 90KHz frequency drives to the first triode, and in various embodiments, the frequency of input is different, and concrete can set according to demand.The duty ratio of this frequency drives is more than or equal to 50%.
(3) magnitude of voltage of the Voltage Feedback point of booster circuit is recorded;
(4) increase to frequency sweep circuit incoming frequency; Step (4) specifically can be increases 1KHz by the incoming frequency of frequency sweep circuit; Added value is decided to be 1KHz, accuracy and precision can be ensured.
(5) magnitude of voltage of the Voltage Feedback point of booster circuit is recorded, and judge whether the frequency to frequency sweep circuit input reaches rated value, rated value is herein set to 130KHz in the present embodiment, and the frequency to frequency sweep circuit input corresponding when magnitude of voltage touches the bottom time is exactly the centre frequency of atomizing piece; If so, terminate scanning, otherwise enter step (4).
By integrated DC-DC boost function, and DC-DC boost mode is changed, make us can realize measuring the mode of power to measure the frequency of ultrasonic atomization sheet, and do not increase the cost of circuit, the circuit controlled with respect to outside boosting IC can also save departmental cost.
As shown in Figure 5, be the voltage change curve figure of Voltage Feedback point DC-FB measured; The unit of the curve chart longitudinal axis is V.
The resonance frequency of the ultrasonic atomization sheet adopted in above example is 115KHz, illustrating below for example:
In example, DC input voitage is 5.0 volts
In example, the voltage ratio of " R1 " " R2 " is 10:1
The frequency that in example, " DC-PWM " inputs is 100KHz, and duty ratio is 45%
In example, " PWM " incoming frequency is 90KHz and adds up with 1KHz, and duty ratio is 50%
In chart, Y-axis is the magnitude of voltage that " DC-FB " place collects, and unit is V;
In chart, X-axis is the respective frequencies to the input of " PWM " place.
According to the test of reality, we can show from chart that the overall power only having " DRIVE " circuit when the resonance frequency of " PWM " frequency near ultrasonic atomization sheet time is maximum, the power that " DC-DC " circuit provides in this example is constant, therefore along with the voltage at increase " DC-FB " place of " DRIVE " circuit power consumption can reduce.
The utility model improves the precision of ultrasonic atomization sheet circuit frequency sweep, and can be applicable to measurement and the driving of various ultrasonic atomization sheet frequency widely; Because do not need the peak based on pulse signal to measure, the ultrasonic atomization sheet frequency scanning of megahertz rank therefore can be carried out; Do not need to carry out difference to the atomizing piece of different model compensate for, therefore can any ultrasonic atomization sheet of driving truly.
These are only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (5)
1. a ultrasonic atomization sheet high accuracy frequency sweep circuit, comprise booster circuit and frequency sweep circuit, it is characterized in that: described booster circuit is electrically connected with described frequency sweep circuit, described booster circuit comprises the 4th electric capacity, diode, the second inductance, the second triode, the first resistance and the second resistance; Described 4th electric capacity and described diode all in parallel with DC power supply, the negative pole pin of described diode is connected with the positive pole of DC power supply, and be connected with one end of described second inductance, the other end of described second inductance connects drain electrode and first resistance of the second triode, described first resistance and the second resistance serial connection, the source electrode of described second triode is connected the negative pole of DC power supply with the second resistance.
2. a kind of ultrasonic atomization sheet high accuracy frequency sweep circuit according to claim 1, is characterized in that: described frequency sweep circuit comprises the first electric capacity, the second electric capacity, the 3rd electric capacity, the first inductance, the first triode and atomizing piece; Described second electric capacity and the first resistance and the second resistor coupled in parallel, the positive pole of described second electric capacity connects the first inductance, and the other end of described first inductance connects drain electrode and first electric capacity of the first triode; Described first electric capacity, atomizing piece and the 3rd capacitance series, described 3rd electric capacity is connected with the source electrode of described second electric capacity and the first triode respectively.
3. a kind of ultrasonic atomization sheet high accuracy frequency sweep circuit according to claim 1, it is characterized in that: the serial connection point of described first resistance and described second resistance is Voltage Feedback point, described Voltage Feedback point is used for the change of recording voltage value when frequency sweep, described Voltage Feedback point is when normal work for adjusting the incoming frequency of the grid of the second triode, and the duty ratio of described incoming frequency is 20%-60%.
4. a kind of ultrasonic atomization sheet high accuracy frequency sweep circuit according to claim 2, is characterized in that: the grid of described first triode is frequency reception point, and its frequency duty ratio is more than or equal to 50%.
5. a kind of ultrasonic atomization sheet high accuracy frequency sweep circuit according to any one of claim 1-4, is characterized in that: described first triode and described second triode are N channel field-effect pipe.
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| CN201520587095.1U CN204906355U (en) | 2015-08-06 | 2015-08-06 | Ultrasonic atomization piece high accuracy frequency sweep circuit |
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| CN201520587095.1U CN204906355U (en) | 2015-08-06 | 2015-08-06 | Ultrasonic atomization piece high accuracy frequency sweep circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105049024A (en) * | 2015-08-06 | 2015-11-11 | 深圳市尚进电子科技有限公司 | High-precision frequency sweeping circuit and frequency sweeping method of ultrasonic atomization piece |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105049024A (en) * | 2015-08-06 | 2015-11-11 | 深圳市尚进电子科技有限公司 | High-precision frequency sweeping circuit and frequency sweeping method of ultrasonic atomization piece |
| WO2017020563A1 (en) * | 2015-08-06 | 2017-02-09 | 深圳市尚进电子科技有限公司 | High-precision frequency sweeping circuit and frequency sweeping method for ultrasonic atomization piece |
| CN105049024B (en) * | 2015-08-06 | 2018-12-18 | 深圳市尚进电子科技有限公司 | A kind of ultrasonic atomization piece high-precision frequency sweep circuit and frequency sweeping method |
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