CN109620990B - Ultrasonic aromatherapy device with constant spraying quantity - Google Patents
Ultrasonic aromatherapy device with constant spraying quantity Download PDFInfo
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- CN109620990B CN109620990B CN201811597077.6A CN201811597077A CN109620990B CN 109620990 B CN109620990 B CN 109620990B CN 201811597077 A CN201811597077 A CN 201811597077A CN 109620990 B CN109620990 B CN 109620990B
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- 238000005507 spraying Methods 0.000 title claims abstract description 46
- 238000000222 aromatherapy Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 91
- 238000001514 detection method Methods 0.000 claims abstract description 47
- 239000003990 capacitor Substances 0.000 claims description 61
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 29
- 239000011889 copper foil Substances 0.000 claims description 29
- 230000006698 induction Effects 0.000 claims description 26
- 238000005070 sampling Methods 0.000 claims description 21
- 238000000889 atomisation Methods 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 18
- 239000007921 spray Substances 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 101100272964 Arabidopsis thaliana CYP71B15 gene Proteins 0.000 description 3
- 101150030164 PADI3 gene Proteins 0.000 description 3
- 102100035734 Protein-arginine deiminase type-3 Human genes 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 101100123053 Arabidopsis thaliana GSH1 gene Proteins 0.000 description 2
- 101100298888 Arabidopsis thaliana PAD2 gene Proteins 0.000 description 2
- 101000590281 Homo sapiens 26S proteasome non-ATPase regulatory subunit 14 Proteins 0.000 description 2
- 101001114059 Homo sapiens Protein-arginine deiminase type-1 Proteins 0.000 description 2
- 101150092599 Padi2 gene Proteins 0.000 description 2
- 102100023222 Protein-arginine deiminase type-1 Human genes 0.000 description 2
- 102100035735 Protein-arginine deiminase type-2 Human genes 0.000 description 2
- XLYOFNOQVPJJNP-PWCQTSIFSA-N Tritiated water Chemical compound [3H]O[3H] XLYOFNOQVPJJNP-PWCQTSIFSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/14—Disinfection, sterilisation or deodorisation of air using sprayed or atomised substances including air-liquid contact processes
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Special Spraying Apparatus (AREA)
- Catching Or Destruction (AREA)
Abstract
The invention discloses an ultrasonic aromatherapy device with constant spraying quantity, which comprises a water tank, a main control module, an ultrasonic sweep frequency module and a water level detection module, wherein the main control module is respectively connected with the ultrasonic sweep frequency module and the water level detection module, and the water level detection module is used for detecting the height of the water level in the water tank. The invention relates to the technical field of ultrasonic aromatherapy, in particular to an ultrasonic aromatherapy device with constant spraying quantity.
Description
Technical Field
The invention relates to the technical field of ultrasonic aromatherapy, in particular to an ultrasonic aromatherapy device with constant spraying quantity.
Background
Because of individual difference of resonant frequency of the ultrasonic atomization sheet, the traditional separate excitation type ultrasonic aromatherapy machine driven by CPU frequency chasing is characterized in that a CPU outputs sweep frequency change signals with a certain frequency range, a MOS tube and a boost inductor are pushed to generate high-voltage alternating waveforms to drive the ultrasonic atomization sheet to work, and meanwhile, the working current of a circuit is converted into feedback voltage through a sampling resistor for the CPU frequency chasing detection. When the CPU detects that the feedback voltage corresponding to a certain frequency sweep signal is the maximum value, the feedback voltage is regarded as the optimal resonance point of the ultrasonic atomization sheet, and the optimal resonance point is written into an EEPROM in the CPU to be locked, so that the frequency tracking process is realized. Because the voltage-stabilizing power supply is adopted, when the CPU frequency reaches the optimal resonance frequency point, the working current is correspondingly constant, and the alternating voltage peak value at the two ends of the atomizing sheet does not change along with the water level in the water tank, if no gear shifting is carried out, the ultrasonic humidifier is always in an output working state of constant power, and therefore, one problem is that the spraying quantity can change greatly along with the change of the water level, namely, because the atomizing sheet is usually arranged at the bottom of the water tank, when the water level in the water tank is higher, the water pressure born by the atomizing sheet is high, the output power of the atomizing sheet is required to push more water to do work, and therefore, the spraying water column is lower and the spraying quantity is smaller. When the water level in the water tank is lower, the water pressure born by the atomizing sheet is correspondingly small, and the output power of the atomizing sheet is still as great as the original power, and the spraying amount is naturally and obviously increased as the water to be pushed is reduced; therefore, the mist is less when the water is more, the mist is larger when the water is less, the spraying speed is obviously accelerated, and the requirement of uniform spraying cannot be met.
Disclosure of Invention
The invention aims to provide an ultrasonic aromatherapy device with constant spraying quantity, which can adjust the spraying quantity by detecting the height of a water level, so as to realize a stable spraying speed.
The technical scheme adopted by the invention is as follows: the utility model provides an ultrasonic wave aromatherapy device of invariable spraying volume, includes water tank, main control module, ultrasonic wave sweep frequency module and water level detection module, main control module respectively with ultrasonic wave sweep frequency module water level detection module is connected, water level detection module is used for detecting the height of water level in the water tank.
As a further improvement of the scheme, the water level detection module comprises a rectifying and filtering circuit and a water level detector, wherein the output end of the water level detector is connected with the input end of the rectifying and filtering circuit, and the output end of the rectifying and filtering circuit is connected with the detection input end of the main control module.
As a further improvement of the scheme, the water level detector is arranged on the outer wall of the water tank and comprises a water level detection PCB and induction copper foils, the induction copper foils are arranged on the water level detection PCB, gaps are reserved between every two adjacent induction copper foils, and the rectification filter circuit is correspondingly connected with the induction copper foils.
As a further improvement of the scheme, the ultrasonic sweep frequency module comprises a drive spraying circuit, the drive spraying circuit comprises a first resistor, a second resistor, a first MOS tube, a boost inductor, a first capacitor and an ultrasonic atomization sheet, the main control module comprises a signal output end for outputting sweep frequency signals, the signal output end of the main control module is connected with a grid electrode of the first MOS tube through the connection of the first resistor, a first input end of the boost inductor is connected with a power supply voltage, a second input end of the boost inductor is connected with a drain electrode of the first MOS tube, an output end of the boost inductor is connected with one end of the ultrasonic atomization sheet through a series connection of the first capacitor, the other end of the ultrasonic atomization sheet is connected with a source electrode of the first MOS tube, and the grid electrode of the first MOS tube is connected with a source electrode of the first MOS tube through the second resistor.
As a further improvement of the scheme, the ultrasonic sweep frequency module further comprises a sampling circuit, the main control module comprises a sampling input end, the sampling circuit comprises a second capacitor, a third resistor and a fourth resistor, the source electrode of the first MOS tube is connected with the power ground through the third resistor in series, the second capacitor is connected with the third resistor in parallel, one end of the second capacitor is connected with the sampling input end of the main control module through the fourth resistor in series, and the sampling input end of the main control module is connected with the power ground through the third capacitor.
As a further improvement of the scheme, the ultrasonic sweep frequency module further comprises a direct-current voltage stabilizing circuit, wherein the direct-current voltage stabilizing circuit comprises a fourth capacitor and a fifth capacitor, and the fourth capacitor and the fifth capacitor are respectively connected between the power supply voltage and the power supply ground.
As a further improvement of the scheme, the rectifying and filtering circuit comprises a third rectifying diode, a fifth resistor, an eighth resistor, a sixth capacitor and a second triode, wherein the first input end of the third rectifying diode is connected with one end of the fifth resistor and the power supply ground, the second input end of the third rectifying diode is electrically connected with the induction copper foil, the output end of the third rectifying diode is connected with the other end of the fifth resistor, the output end of the third rectifying diode is connected with the base of the second triode through series connection of the eighth resistor, the emitter of the second triode is connected with the power supply ground, the collector of the second triode is connected with the detection input end of the main control module, one end of the sixth capacitor is connected with the base of the second triode, and the other end of the sixth capacitor is connected with the emitter of the second triode.
The beneficial effects of the invention are as follows:
The utility model provides an ultrasonic wave aromatherapy device of invariable spraying volume, detects the height of water level in the water tank through water level detection module, automatically regulated spraying's output, and then adjusts spraying volume, realizes more stable spraying speed to satisfy the user and to the requirement of aromatherapy device at uniform velocity spraying.
Drawings
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
FIG. 1 is a block diagram of an ultrasonic fragrance device with constant spraying amount according to the first embodiment of the invention;
FIG. 2 is a schematic circuit diagram of an ultrasonic sweep frequency module of an ultrasonic aromatherapy device with constant spray quantity according to the first embodiment of the invention;
fig. 3 is a schematic circuit diagram of a water level detection module of an ultrasonic aromatherapy device with constant spray amount according to the first embodiment of the invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
Example 1
Fig. 1 is a block diagram of an ultrasonic aromatherapy device with constant spraying amount according to an embodiment of the present invention, and referring to fig. 1, an ultrasonic aromatherapy device with constant spraying amount includes a water tank, a main control module, an ultrasonic sweep frequency module, and a water level detection module. The main control module is respectively connected with the ultrasonic sweep frequency module and the water level detection module, and the water level detection module is used for detecting the height of the water level in the water tank.
In this embodiment, the main control module may be a single chip microcomputer with an internal EEPROM, preferably, the main control module is a single chip microcomputer with an internal RC oscillation frequency of at least 8MHz and a ROM space of at least 2K, the ultrasonic sweep frequency module includes a driving spray circuit and a sampling circuit, a signal output end of the main control module is connected with an input end of the driving spray circuit, and a sampling input end of the main control module is connected with an output end of the sampling circuit.
Fig. 2 is a schematic diagram of an ultrasonic sweep frequency module circuit of an ultrasonic aromatherapy device with constant spraying quantity according to an embodiment of the invention, referring to fig. 2, a driving spraying circuit comprises a first resistor R1, a second resistor R2, a first MOS tube Q1, a boost inductor L1, a first capacitor C1 and an ultrasonic atomization sheet CY1, a signal output end PWM of a main control module is connected with a gate of the first MOS tube Q1 by connecting the first resistor R1, a first input end of the boost inductor L1 is connected with a power supply voltage +vdd, a second input end of the boost inductor L1 is connected with a drain of the first MOS tube, an output end of the boost inductor L1 is connected with one end of the ultrasonic atomization sheet CY1 by connecting the first capacitor C1 in series, the other end of the ultrasonic atomization sheet CY1 is connected with a source of the first MOS tube Q1, and a gate of the first MOS tube Q1 is connected with a source of the first MOS tube by connecting the second resistor R2. In this embodiment, the first MOS transistor is an N-channel MOSFET transistor with a withstand voltage of 100V, and the types of 16N10, 12N10, etc. are selected, without adding a heat sink. The first resistor R1 can take 10 to 22 omega so as to prevent the signal output end PWM of the main control module from being damaged due to overlarge charge-discharge current of the MOSFET junction capacitor of the first MOS tube Q1, and the first resistor R1 cannot take an overlarge value, otherwise, the overlarge MOSFET conduction internal resistance of the first MOS tube Q1 can be caused, and the spray output power is obviously reduced.
The second resistor R2 is a pull-down resistor of the first MOS transistor Q1, and may take 22kΩ to 47kΩ, so as to ensure that the gate of the first MOS transistor Q1 is at a low level during the shutdown or standby mode, so that the first MOS transistor Q1 is in a reliable off state. In this embodiment, the boost inductor L1 is a three-leg i-shaped winding inductor, the current resistance of the boost inductor is greater than 3A, the inductance is selected to be matched with the resonant frequency of the connected ultrasonic atomization sheet CY1 (i.e. the PWM driving frequency of the signal output end of the main control module), for the ultrasonic aromatherapy device with the power supply voltage DC5V to DC12V and the ultrasonic atomization sheet of 3MHz, the boost inductor L1 is recommended to use 5uH (inductance between the first input end and the second input end): 10uH (inductance between the second input end and the output end), and the first capacitor C1 is selected to be 10nF/250V.
In this embodiment, when the aromatherapy device is turned on and sprayed for the first time, the signal output end PWM of the main control module automatically outputs a set of square wave sweep signals (assuming that the working frequency of the ultrasonic atomization sheet is 1.7MHz or 3MHz, the frequency hopping interval can be 10kHz to 20kHz each time, the frequency range of the sweep signals can be the standard resonance point ±150khz of the ultrasonic atomization sheet), the sweep signals output by the signal output end PWM of the main control module push the first MOS tube to be turned on and turned off with the same frequency switch through the first resistor R1, when the first MOS tube is turned on, the first input end and the second input end of the boost inductor L1 are powered on for energy storage, the output end of the boost inductor L1 is boosted, and after the direct current is removed through the first capacitor C1, the ultrasonic atomization sheet CY1 is driven to push the liquid in the water tank to generate spray.
Referring to fig. 2, the sampling circuit includes a second capacitor C2, a third capacitor C3, a third resistor R3 and a fourth resistor R4, where the source of the first MOS transistor Q1 is connected to the power ground through the third resistor R3 in series, the second capacitor C2 is connected in parallel with the third resistor R3, one end of the second capacitor C2 is connected to the sampling input a/D of the main control module through the fourth resistor R4 in series, and the sampling input a/D of the main control module is connected to the power ground through the third capacitor C3. In this embodiment, the second capacitor C2 may be 47nF/50V to 100nF/50V, the third capacitor C3 may be 10nF/50V, and the fourth resistor R4 may be 1kΩ to 10kΩ.
The third resistor R3 converts working current of the ultrasonic sweep frequency module into voltage, and the voltage is used as feedback voltage to be sent to the sampling input end A/D of the main control module for detection after resistance-capacitance filtering of the second capacitor C2, the fourth resistor R4 and the third capacitor C3. The third resistor R3 should take the value of 0.1 omega to 0.25 omega and 1/2W, and the third resistor R3 cannot take the value too large, otherwise, the negative feedback of the sampling circuit is too strong, so that the spray output power and the spray quantity are obviously reduced; the third resistor R3 should not take too small value, otherwise, the feedback voltage will be too small to make the main control module generate erroneous judgment.
When the frequency of the sweep frequency signal output by the signal output end PWM of the main control module and the ultrasonic atomization piece CY1 reach resonance, the ultrasonic atomization piece CY1 is sprayed most strongly, and the working current and the feedback voltage of the ultrasonic sweep frequency module are both maximized. And comparing the maximum values of the feedback voltages corresponding to all the sweep frequency points by detecting the feedback voltages at two ends of the third resistor R3, taking the frequency point of the maximum value of the feedback voltage as the resonant frequency, and locking the EEPROM stored in the main control module to be used as the fixed output frequency of the main control module for subsequent spraying, thereby completing the automatic frequency tracking calibration process. It should be noted that, since the PWM frequency adjustment of the main control module uses program instructions to modify the main frequency of the PWM timer by adjusting the setting of the internal oscillation parameters of the RC, when the main control module adjusts the resonant frequency of the PWM output, the influence of the modified RC parameter setting on the timing accuracy of the original program must be aimed at, and the timing count is increased or decreased appropriately in the program to make corresponding timing compensation, so as to ensure the accuracy of the timing time.
In this embodiment, the ultrasonic frequency sweep module further includes a DC voltage stabilizing circuit, where the DC voltage stabilizing circuit includes a fourth capacitor C4 and a fifth capacitor C5, the fourth capacitor C4 and the fifth capacitor C5 are respectively connected between the power supply voltage +vdd and the power supply ground, the power supply voltage +vdd is a stable DC voltage, which may be DC5V to DC24V (the larger the power supply voltage is, the larger the maximum spraying power and the spraying amount is), the fourth capacitor C4 may be 100nF/50V, the fifth capacitor C5 may be 220uF to 470uF, the withstand voltage thereof may be 10V greater than the power supply voltage +vdd, so that the power supply stability of the power supply voltage +vdd during spraying operation can be improved, and the authenticity and accuracy of the corresponding relationship between the maximum value change of the feedback voltage and the frequency of the sampling input end a/D of the master control module is ensured (if the power supply voltage +vdd is unstable during operation, the feedback waveform of the feedback voltage inputted to the sampling input end a/D fluctuates along with the fluctuation, which causes the master control module to mislock the frequency, resulting in that the spraying cannot work at the optimum resonance frequency, and even cannot cause normal spraying effect.
The main control module adopts DC5V voltage stabilization power supply to ensure that the signal output end PWM has high enough voltage to drive the first MOS tube Q1, so as to reduce the conduction internal resistance of the MOSFET tube as much as possible and obtain larger power output and spraying effect.
Referring to fig. 1, in this embodiment, the water level detection module includes a rectifying and filtering circuit and a water level detector, where an output end of the water level detector is connected to an input end of the rectifying and filtering circuit, and an output end of the rectifying and filtering circuit is connected to a detection input end of the main control module. Wherein the water level detector is provided at an outer wall of the water tank (not shown in fig. 1).
Fig. 3 is a schematic circuit diagram of a water level detection module of an ultrasonic aromatherapy device with constant spraying amount according to the first embodiment of the invention, and referring to fig. 3, the water level detector comprises a water level detection PCB board 1 and induction copper foils PAD, the induction copper foils PAD are arranged on the water level detection PCB board 1, a gap is arranged between two adjacent induction copper foils PAD, preferably, the gap between two adjacent induction copper foils PAD is not less than 1.5mm, and the area of each induction copper foil is not less than 72 square millimeters. In this embodiment, three sensing copper foils PAD are provided (the number of sensing copper foils can be set according to actual requirements), and a single rectifying and filtering circuit is correspondingly connected with a single sensing copper foil PAD.
In this embodiment, the rectifying and filtering circuit includes a first rectifying and filtering circuit, a second rectifying and filtering circuit and a third rectifying and filtering circuit, where the first rectifying and filtering circuit includes a third rectifying diode D3, a fifth resistor R5, an eighth resistor R8, a sixth capacitor C6 and a second triode Q2, a first input end of the third rectifying diode D3 is connected with one end of the fifth resistor R5 and a power ground, a second input end of the third rectifying diode D3 is electrically connected with a first inductive copper foil PAD1, an output end of the third rectifying diode D3 is connected with a base of the second triode Q2 through a serial eighth resistor R8, an emitter of the second triode Q2 is connected with a power ground, a collector of the second triode Q2 is connected with a first detection input end WATER1 of the master control module, one end of the sixth capacitor C6 is connected with a base of the second triode Q2, and another end of the sixth capacitor C6 is connected with an emitter of the second triode Q2.
The second rectifying circuit comprises a fourth rectifying diode D4, a sixth resistor R6, a ninth resistor R9, a seventh capacitor C7 and a third triode Q3, wherein the first input end of the fourth rectifying diode D4 is connected with one end of the sixth resistor R6 and power ground, the second input end of the fourth rectifying diode D4 is electrically connected with a second induction copper foil PAD2, the output end of the fourth rectifying diode D4 is connected with the base electrode of the third triode Q3 through a ninth resistor R9 in series, the emitter electrode of the third triode Q3 is connected with power ground, the collector electrode of the third triode Q3 is connected with a second detection input end WATER2 of the main control module, one end of the seventh capacitor C7 is connected with the base electrode of the third triode Q3, and the other end of the seventh capacitor C7 is connected with the emitter electrode of the third triode Q3.
The third rectifying circuit comprises a fifth rectifying diode D5, a seventh resistor R7, a tenth resistor R10, an eighth capacitor C8 and a fourth triode Q4, wherein the first input end of the fifth rectifying diode D5 is connected with one end of the seventh resistor R7 and the power ground, the second input end of the fifth rectifying diode D5 is electrically connected with a third induction copper foil PAD3, the output end of the fifth rectifying diode D5 is connected with the base electrode of the fourth triode Q4 through a tenth resistor R10 connected in series, the emitter electrode of the fourth triode Q4 is connected with the power ground, the collector electrode of the fourth triode Q4 is connected with a third detection input end WATER3 of the main control module, one end of the eighth capacitor C8 is connected with the base electrode of the fourth triode Q4, and the other end of the eighth capacitor C8 is connected with the emitter electrode of the fourth triode Q4.
In this embodiment, the first detection input end WATER1, the second detection input end WATER2 and the third detection input end WATER3 of the main control module are all three I/O ports of the single-chip microcomputer, the three I/O ports of the single-chip microcomputer should be set to be pulled up internally, otherwise, high-low level changes cannot be generated for detection of the single-chip microcomputer.
In this embodiment, the first transistor Q1, the second transistor Q2, and the third transistor Q3 are NPN transistors, which may be 3904, 9014, 8050, etc. The third rectifying diode D3, the fourth rectifying diode D4 and the fifth rectifying diode D5 can be selected from series of double diodes such as BAV99, BAT54S and the like. The sixth capacitor C6, the seventh capacitor C7 and the eighth capacitor C8 are all 1uF/50V. The eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 are 150 Ω to obtain a dc voltage with a certain value and protect the first transistor Q1, the second transistor Q2 and the third transistor Q3 from being burnt out due to overcurrent.
When the ultrasonic aromatherapy device starts to spray, the oscillation alternating voltage on the surface of the ultrasonic atomization sheet can be transmitted to all around through the water-containing conductive medium in the water tank, and is transmitted to the induction copper foil PAD through the outer wall of the water tank to generate induction voltage. The induction copper foil PAD receives an oscillation alternating induction signal transmitted by water in the water tank and forms a capacitance induction effect with the water in the water tank inside and outside the wall of the water tank. When the first induction copper foil PAD1 induces oscillation alternating voltage, the oscillation alternating voltage is rectified through a third rectifying diode D3, filtered through a fifth resistor R5, an eighth resistor R8 and a sixth capacitor C6, and then converted into direct-current voltage to drive a second triode Q2 to be conducted, a low level is input to a first detection input end WATER1 of the main control module, when the first detection input end WATER1 of the main control module detects the low level, the first-grade WATER level is judged to have WATER, and when the first detection input end WATER1 of the main control module detects the high level, the first-grade WATER level is judged to have no WATER. When the second induction copper foil PAD2 induces oscillation alternating voltage, the oscillation alternating voltage is rectified through a fourth rectifying diode D4, filtered through a sixth resistor R6, a ninth resistor R9 and a seventh capacitor C7, and then converted into direct-current voltage to drive a third triode Q3 to be conducted, a low level is input to a second detection input end WATER2 of the main control module, when the second detection input end WATER2 of the main control module detects the low level, the WATER in the second WATER level is judged to exist, and when the second detection input end WATER2 of the main control module detects the high level, the WATER in the second WATER level is judged to exist. When the third sensing copper foil PAD3 senses oscillation alternating voltage, the third sensing copper foil PAD3 is rectified through a fifth rectifying diode D5, filtered through a seventh resistor R7, a tenth resistor R10 and an eighth capacitor C8, and then converted into direct-current voltage to drive a fourth triode Q4 to be conducted, a low level is input to a third detection input end WATER3 of the main control module, when the third detection input end WATER3 of the main control module detects the low level, the third WATER level is judged to have WATER, and when the third detection input end WATER3 of the main control module detects the high level, the third WATER level is judged to have no WATER.
The main control module automatically adjusts the waveform duty ratio of the sweep frequency signal at the PWM output end of the signal output end according to the detected water level, and adjusts the spraying amount of the ultrasonic aromatherapy device by adjusting the on-off number proportion of the PWM (the higher the water level is, the larger the PWM duty ratio is, the larger the power output by the atomizing sheet is, the larger the spraying amount is, the lower the water level is, the smaller the PWM duty ratio is, the smaller the power output by the atomizing sheet is, and the smaller the spraying amount is), thereby achieving constant spraying amount.
While the preferred embodiment of the present application has been described in detail, the application is not limited to the embodiment, and one skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the application, and the equivalent modifications or substitutions are included in the scope of the present application as defined in the appended claims.
Claims (3)
1. The ultrasonic aromatherapy device with the constant spraying quantity comprises a water tank and is characterized by comprising a main control module, an ultrasonic sweep frequency module and a water level detection module, wherein the main control module is respectively connected with the ultrasonic sweep frequency module and the water level detection module, and the water level detection module is used for detecting the height of the water level in the water tank; the water level detection module comprises a rectifying and filtering circuit and a water level detector, wherein the output end of the water level detector is connected with the input end of the rectifying and filtering circuit, and the output end of the rectifying and filtering circuit is connected with the detection input end of the main control module; the water level detector is arranged on the outer wall of the water tank and comprises a water level detection PCB and induction copper foils, the induction copper foils are arranged on the water level detection PCB, a gap is reserved between two adjacent induction copper foils, and each rectification filter circuit is correspondingly connected with a single induction copper foil so as to judge the water level of a gear corresponding to each induction copper foil according to a single rectification filter circuit corresponding to each induction copper foil; the ultrasonic sweep frequency module comprises a driving spraying circuit; the driving spray circuit comprises a first resistor, a second resistor, a first MOS tube, a boosting inductor, a first capacitor and an ultrasonic atomization sheet, wherein the signal output end of the main control module is connected with the grid electrode of the first MOS tube through the first resistor, the first input end of the boosting inductor is connected with a power supply voltage, the second input end of the boosting inductor is connected with the drain electrode of the first MOS tube, the output end of the boosting inductor is connected with one end of the ultrasonic atomization sheet through the first capacitor in series, the other end of the ultrasonic atomization sheet is connected with the source electrode of the first MOS tube, and the grid electrode of the first MOS tube is connected with the source electrode of the first MOS tube through the second resistor; the main control module comprises a signal output end for outputting a sweep frequency signal, and the signal output end of the main control module is connected with the driving spraying circuit; the main control module automatically adjusts the waveform duty ratio of the sweep frequency signal at the signal output end according to the detected water level, and adjusts the spraying quantity of the ultrasonic aromatherapy device by adjusting the number proportion of PWM on-off so as to achieve constant spraying quantity; the ultrasonic sweep frequency module further comprises a direct current voltage stabilizing circuit, wherein the direct current voltage stabilizing circuit comprises a fourth capacitor and a fifth capacitor, and the fourth capacitor and the fifth capacitor are respectively connected between the power supply voltage and the power supply ground.
2. The ultrasonic aromatherapy device with constant spraying quantity according to claim 1, wherein the ultrasonic sweep module further comprises a sampling circuit, the main control module comprises a sampling input end, the sampling circuit comprises a second capacitor, a third resistor and a fourth resistor, a source electrode of the first MOS tube is connected with a power supply ground through the third resistor in series, the second capacitor is connected with the third resistor in parallel, one end of the second capacitor is connected with the sampling input end of the main control module through the fourth resistor in series, and the sampling input end of the main control module is connected with the power supply ground through the third capacitor.
3. The ultrasonic aromatherapy device with constant spraying quantity according to claim 1, wherein the rectifying and filtering circuit comprises a third rectifying diode, a fifth resistor, an eighth resistor, a sixth capacitor and a second triode, a first input end of the third rectifying diode is connected with one end of the fifth resistor and a power supply ground, a second input end of the third rectifying diode is electrically connected with the induction copper foil, an output end of the third rectifying diode is connected with the other end of the fifth resistor, an output end of the third rectifying diode is connected with a base electrode of the second triode through series connection with the eighth resistor, an emitter electrode of the second triode is connected with a power supply ground, a collector electrode of the second triode is connected with a detection input end of the main control module, one end of the sixth capacitor is connected with a base electrode of the second triode, and the other end of the sixth capacitor is connected with an emitter electrode of the second triode.
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| CN110243433B (en) * | 2019-05-21 | 2021-03-30 | 广州畅呼医疗器械有限公司 | Water shortage detection system and method for atomizer and atomizer |
| US20220400747A1 (en) * | 2019-11-26 | 2022-12-22 | China Tobacco Hunan Industrial Co., Ltd. | Ultrasonic atomizing sheet full-wave drive circuit and ultrasonic electronic cigarette |
| CN115931985A (en) * | 2022-12-02 | 2023-04-07 | 成都目然健康科技有限公司 | Atomization amount measuring device based on capacitor, atomizer and atomization control method |
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