CN210159866U - Separately excited atomizer oscillation circuit - Google Patents
Separately excited atomizer oscillation circuit Download PDFInfo
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- CN210159866U CN210159866U CN201920951505.4U CN201920951505U CN210159866U CN 210159866 U CN210159866 U CN 210159866U CN 201920951505 U CN201920951505 U CN 201920951505U CN 210159866 U CN210159866 U CN 210159866U
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Abstract
The utility model relates to a separately excited atomizer oscillating circuit, including atomizing piece, oscillating circuit, power tube, minimum voltage detection circuit, starting circuit, and on-off control circuit: the minimum voltage detection circuit is used for detecting the minimum value of the oscillating voltage of the oscillating circuit and sending the detection result to the switch control circuit; the switch control circuit is used for receiving the detection result and driving the power tube to be switched on or switched off, and the power tube is switched on to drive the starting circuit; the starting circuit is used for driving the oscillating circuit to oscillate; the oscillating circuit is used for driving the atomization piece to resonate so as to atomize the liquid. The utility model discloses simple structure simplifies the oscillating circuit and has improved oscillating circuit's performance, reaches reduce cost and avoids the effect of distortion.
Description
Technical Field
The utility model relates to a separately swash formula atomizer oscillating circuit belongs to the electronic equipment field.
Background
Nebulizers have become an indispensable part of modern life, and since they can nebulize liquid, they play a great role in air humidification, medical drug solution atomization, and the like. The atomizing theory of operation of atomizing piece is through the high frequency resonance of atomizing piece, breaks up liquid hydrone structure and naturally diffuses to the air in, need not to heat liquid, the energy can be saved.
A conventional atomizer resonance and control circuit is shown in fig. 1, and mainly comprises a mist quantity control and bias circuit, an oscillation circuit, and a water quantity detection and fan control circuit. In the water amount detection and fan control circuit, K2 is a water level detection switch. When the water level is normal, K2 is closed, the light-emitting diode D3 emits light, the base electrode of the triode Q2 is biased, therefore, the light-emitting diode D2 is short-circuited, the base electrode of the triode Q3 is biased, and the fan M works; when the water level is low, the switch K2 is turned off, the light emitting diode D2 emits light, the light emitting diode D3 is turned off, and the fan M stops working. In the fog amount control and bias circuit, a switch K1 is a main switch, when a switch K1 is closed and the water level is normal, namely the switches K1 and K2 are closed, a power supply is connected in series through resistors R6 and R3 for voltage division, and then the voltage drop of an adjustable resistor R1 is adjusted, the base electrode of a power tube Q1 in the oscillating circuit is biased through resistors R4 and R5 and an inductor L1, the fog amount is adjusted by adjusting the resistance value of an adjustable resistor R1, namely the oscillation amplitude of an atomizing sheet is adjusted by adjusting the bias resistor; when the water level line is low, the switch K2 is switched off, the base electrode of the power tube is unbiased, and the oscillation circuit stops working. In the oscillating circuit, a power tube Q1 and a peripheral capacitor inductor form a three-point oscillating circuit, an atomizing sheet is bridged between a power supply and a base electrode of a power tube Q1 through a coupling capacitor C2, oscillating voltage of the oscillating circuit is applied to the atomizing sheet through the coupling capacitor C2 to excite the atomizing sheet to oscillate, the natural frequency of the atomizing sheet is usually 1.65MHz, an oscillating signal of the atomizing sheet is fed back to the oscillating circuit through the coupling capacitor C2 to enable the oscillating circuit to resonate at 1.65MHz, namely piezoelectric resonance is generated, the ultrasonic oscillating atomizing sheet converts electric energy into mechanical energy, and surface water is vibrated into water mist.
Although the traditional atomizer resonance and control circuit has good performance and small radiation, the circuit structure is complex, the energy conversion efficiency is low, and the cost is high, so the atomization plate oscillation circuit with simple circuit structure and low cost is produced, as shown in fig. 2. The circuit is controlled by a single chip microcomputer, a GATE end of the single chip microcomputer outputs a switching signal of a power tube Q1, when the power tube Q1 is turned on, an inductor L1 is charged, voltage of a VA side of an atomization sheet is reduced, the single chip microcomputer detects current flowing through the power tube Q1 through a CS end and controls the power tube Q1 to be turned off; after the power tube Q1 is turned off, the inductor L1 discharges, the voltage on the atomization sheet VA side rises until the power tube Q1 is turned on next time, and finally, oscillation is generated by the control of the single chip microcomputer, and the oscillation waveform on the atomization sheet VA side is as shown in fig. 3. Referring to fig. 4 again, since the voltage on the VB side of the atomizing plate is almost constant and the voltage larger than the voltage on the VB side is generated only by the VA side of the atomizing plate, the oscillating of the atomizing plate is difficult, and the circuit has poor operation performance, which easily causes resonance distortion and generates radiation. The EMI (electromagnetic interference) conducted test waveform is shown in fig. 4, and it can be seen from the figure that the conducted interference is large at both the eigenfrequency and the multiple frequency.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can solve above-mentioned current problem, and simple structure's separately swash formula atomizer oscillating circuit.
In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a separate excited atomizer oscillating circuit, includes atomizing piece, oscillating circuit, power tube, minimum voltage detection circuit, starting circuit, and on-off control circuit:
the minimum voltage detection circuit is used for detecting the minimum value of the oscillating voltage of the oscillating circuit and sending the detection result to the switch control circuit;
the switch control circuit is used for receiving the detection result and driving the power tube to be switched on or switched off, and the power tube is switched on to drive the starting circuit;
the starting circuit is used for driving the oscillating circuit to oscillate;
the oscillating circuit is used for driving the atomization piece to resonate so as to atomize the liquid.
Further, the oscillating circuit comprises an inductor, and the atomizing plate is connected with the inductor in parallel.
Further, the switch control circuit comprises an RS trigger and a driving circuit which are connected with the minimum voltage detection circuit, and the output end of the RS trigger is connected with the input end of the driving circuit.
Furthermore, the switch control circuit further comprises a resistor and a comparator which are connected into the oscillating circuit, the first end of the resistor is connected with the forward input end of the comparator and the source electrode of the power tube in parallel, the second end of the resistor is grounded, the reverse input end of the comparator is connected with a reference voltage, and when the voltage value of the resistor is equal to the reference voltage, the comparator drives the RS trigger to operate so as to close the power tube.
The beneficial effects of the utility model reside in that: by adding the minimum voltage detection circuit for detecting the voltage value of the oscillating circuit in the circuit, when the voltage value of the oscillating circuit reaches the minimum voltage value of the minimum voltage detection circuit, the switch control circuit is driven to operate to drive the power tube to be started, so that the oscillating quality of the voltage of the atomizing sheet is ensured, and the atomizing sheet is ensured not to be distorted; the power tube is started to drive the starting circuit to drive the oscillating circuit to oscillate, and finally the atomizing plate resonates to atomize the liquid, so that the working performance of the atomizing plate is improved; the utility model discloses simple structure, convenient operation.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of a conventional atomizer resonance and control circuit.
Fig. 2 is a schematic structural diagram of an oscillating circuit of the atomizing plate.
Fig. 3 is a diagram of the oscillation waveform of fig. 2.
FIG. 4 is a waveform diagram of the EMI conduction test of FIG. 2
Fig. 5 is a schematic structural diagram of the separately excited atomizer oscillator circuit according to the present invention.
Fig. 6 is a diagram of the oscillation waveform of fig. 5.
FIG. 7 is a waveform of the EMI conduction test of FIG. 5
Fig. 8 is a flowchart of a method for designing an oscillation circuit of a separately excited atomizer according to the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Referring to fig. 4 to 7, the oscillation circuit of the separately excited atomizer in a preferred embodiment of the present invention includes an atomizing plate, an oscillation circuit, a power tube Q1, a minimum voltage detection circuit, a start circuit, and a switch control circuit. In this embodiment, the oscillating circuit includes an inductor L1, and the atomizing plate is connected in parallel with the inductor L1. One end of the atomizing sheet is connected with a power supply, and the power supply is + 24V; and the other end of the atomizing sheet is connected with the minimum voltage detection circuit and the power tube. The one end of switching in the power is the VA side of atomizing piece, with the one end that power tube Q1 is connected is the VB side of atomizing piece. The minimum voltage detection circuit is connected with the switch control circuit, and the starting circuit is used for connecting the switch control circuit and a power tube Q1, specifically:
the minimum voltage detection circuit is used for detecting the voltage value of the atomization sheet, and when the voltage value of the atomization sheet reaches the minimum voltage value of the minimum voltage detection circuit, the minimum voltage detection circuit drives the switch control circuit to operate;
the switch control circuit is used for driving the power tube Q1 to be switched on or switched off, and the power tube is switched on to drive the starting circuit;
the starting circuit is used for driving the oscillating circuit to oscillate, and the oscillating circuit drives the atomizing sheet to resonate so as to atomize the liquid.
The switch control circuit comprises an RS trigger and a driving circuit, wherein the RS trigger is connected with the minimum voltage detection circuit, the output end of the RS trigger is connected with the input end of the driving circuit, and the RS trigger is used for driving the driving circuit to operate. The switch control circuit also comprises a resistor R1 and a comparator CMP which are connected into the oscillating circuit, wherein the first end of the resistor R1 is connected with the positive input end of the comparator CMP and the source electrode of the power tube Q1 in parallel, the second end of the resistor R1 is grounded, and the negative input end of the comparator CMP is connected with a reference voltage. When the voltage value of the resistor is equal to the reference voltage, the comparator drives the RS trigger to operate so as to close the power tube. In this embodiment, the reference voltage is VREF. Indeed, in other embodiments, the reference voltage may be other, and is not limited herein. When the voltage of the voltage on the VA side of the atomization sheet decreases to 0V, the current flowing through the inductor L1 rapidly increases, so that the voltage value of the resistor R1 also rapidly increases. When the voltage value of the resistor R1 is equal to VREF, the comparator CMP drives the RS trigger to operate to turn off the power tube Q1.
The utility model discloses a concrete working process of separately swashing formula atomizer oscillating circuit does: minimum voltage detection circuit is used for detecting atomizing piece VA side voltage, when the voltage of atomizing piece VA side reaches its oscillating voltage 'S minimum value, minimum voltage detection circuit output high level, the S input end of RS trigger is set, and the Q output of RS trigger exports high level signal to drive circuit' S input, and drive circuit opens power tube Q1 based on this high level signal, and start-up circuit drive oscillating circuit begins to shake this moment, the atomizing piece is with liquid atomization. When the power tube Q1 is turned on, the voltage on the VA side of the atomization sheet drops to 0V, the current flowing through the inductor L1 increases rapidly, the voltage value of the resistor R1 reaches the VREF voltage value, the comparator CMP outputs a high level, the R input terminal of the RS flip-flop is reset, the Q output terminal thereof outputs a low level signal to the input terminal of the driving circuit, the driving circuit turns off the power tube Q1 based on the low level signal, the voltage on the VA side of the atomization sheet rises, and finally the voltage is greater than or equal to twice the VB voltage.
Referring to fig. 8 again, the present invention further provides a design method of the separately excited oscillator circuit of the atomizer, which adopts the separately excited oscillator circuit of the atomizer, and the method includes the following steps:
step 603, the starting circuit drives the oscillation circuit to oscillate;
and step 804, the oscillating circuit drives the atomization piece to resonate so as to atomize the liquid.
The method further comprises the following steps:
the switch control circuit drives the power tube Q1 to be switched on, and the starting circuit drives the oscillating circuit to oscillate through the power tube Q1, so that the atomizing sheet atomizes liquid;
the switch control circuit drives the power tube Q1 to be closed, and the oscillating circuit does not work.
Specifically, the method comprises the following steps:
the step of driving the power tube to be turned on by the switch control circuit is specifically as follows:
the minimum voltage detection circuit sends a first high level signal to the RS trigger, the S end of the set end of the RS trigger sends a set signal, so that the Q output end outputs the high level signal and sends the high level signal to the driving circuit, and the driving circuit receives the high level signal to drive the power tube Q1 to be started.
The step of driving the power tube to be closed by the switch control circuit is specifically as follows:
after the power tube Q1 is turned on, the voltage value across the resistor R1 at the positive input end of the comparator CMP gradually rises, when the voltage value is equal to the reference voltage at the negative input end of the comparator CMP, the output end of the comparator CMP sends a reset signal to the reset end of the RS flip-flop so that the Q output end outputs a low level signal and sends the low level signal to the driving circuit, and the driving circuit receives the low level signal to drive the power tube Q1 to be turned off.
In summary, the following steps: by adding the minimum voltage detection circuit for detecting the voltage value of the oscillating circuit in the circuit, when the voltage value of the oscillating circuit reaches the minimum voltage value of the minimum voltage detection circuit, the driving switch control circuit operates to drive the power tube Q1 to be started, so that the oscillating quality of the voltage of the atomizing plate is ensured, and the voltage of the atomizing plate is ensured not to be distorted; the power tube Q1 is turned on to drive the starting circuit and further drive the oscillating circuit to oscillate, so that the atomizing plate is finally resonated to atomize the liquid, and the working performance of the atomizing plate is improved; the utility model discloses simple structure, convenient operation.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (4)
1. The utility model provides a separately swash formula atomizer oscillating circuit which characterized in that, includes atomizing piece, oscillating circuit, power tube, minimum voltage detection circuit, starting circuit, and on-off control circuit:
the minimum voltage detection circuit is used for detecting the minimum value of the oscillating voltage of the oscillating circuit and sending the detection result to the switch control circuit;
the switch control circuit is used for receiving the detection result and driving the power tube to be switched on or switched off, and the power tube is switched on to drive the starting circuit;
the starting circuit is used for driving the oscillating circuit to oscillate;
the oscillating circuit is used for driving the atomization piece to resonate so as to atomize the liquid.
2. The separately excited atomizer oscillator circuit of claim 1, wherein said oscillator circuit comprises an inductor, and said atomization plate is connected in parallel with said inductor.
3. The separately excited nebulizer oscillation circuit of claim 1, wherein the switching control circuit comprises an RS flip-flop and a driving circuit connected to the minimum voltage detection circuit, and an output terminal of the RS flip-flop is connected to an input terminal of the driving circuit.
4. The separately excited atomizer according to claim 3, wherein said switch control circuit further comprises a resistor and a comparator connected to said oscillation circuit, a first end of said resistor is connected in parallel to a forward input end of said comparator and a source electrode of said power transistor, a second end of said resistor is connected to ground, a reverse input end of said comparator is connected to a reference voltage, and when a voltage value of said resistor equals to said reference voltage, said comparator drives said RS flip-flop to operate to turn off said power transistor.
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| CN201920951505.4U CN210159866U (en) | 2019-06-24 | 2019-06-24 | Separately excited atomizer oscillation circuit |
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| CN201920951505.4U CN210159866U (en) | 2019-06-24 | 2019-06-24 | Separately excited atomizer oscillation circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110152932A (en) * | 2019-06-24 | 2019-08-23 | 苏州力生美半导体有限公司 | Separated exciting atomizer oscillating circuit and design method |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110152932A (en) * | 2019-06-24 | 2019-08-23 | 苏州力生美半导体有限公司 | Separated exciting atomizer oscillating circuit and design method |
| CN110152932B (en) * | 2019-06-24 | 2024-03-29 | 苏州力生美半导体有限公司 | Oscillating circuit of separate excitation type atomizer and control method |
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