Microgrid atomizer control circuit with high atomization rate

Abstract

The invention discloses a micro-grid atomizer control circuit with high atomization rate, which comprises a power supply, a single-chip microcomputer, a three-pin inductor, an MOS tube and a micro-grid atomization sheet, and is characterized in that the single-chip microcomputer is electrically connected with the power supply, and a pulse width modulation (PWM) signal of the single-chip microcomputer is electrically connected with the micro-grid atomization sheet through the three-pin inductor and the MOS tube; wherein the pulse width modulation (PWM) signal generates a high-frequency signal with a preset frequency, the micro-grid atomization sheet is driven by the signal boosted by the three-pin inductor, the micro-grid atomization sheet generates high-frequency vibration, water is instantly decomposed into fine water drops, and then the water drops are sprayed out from a nozzle of the atomizer; the pulse width modulation (PWM) signal adopted by the invention has the advantages of high flexibility, energy conservation, low hardware requirement, easiness in programming and control, and enhanced noise resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of atomizers, and in particular relates to a microgrid atomizer control circuit with a high atomization rate. Background Art

[0002] With the development of industry, air pollution is serious, and the number of patients with respiratory diseases has greatly increased due to the sudden changes in temperature during the transition between seasons. At present, diseases such as bronchial asthma, respiratory viral infections and pneumonia are at a high incidence, and atomization inhalation is one of the most effective methods for treating these diseases. Because the drug directly enters the respiratory tract and lungs, the target organ, through inhalation, it is faster and more effective than oral drugs, and its dosage is only one-tenth of other drug administration methods at most, which significantly reduces the side effects of drugs, especially for children. In inhalation therapy, how to deliver drugs to the patient's respiratory tract and lungs, the inhalation device plays a key role.

[0003] Atomization rate refers to the amount of atomized liquid sprayed out by the atomizer per minute. For an atomizer, its atomization rate is a very important indicator because it directly determines the quality of the atomization effect. If the atomization rate is too low, the liquid cannot be completely atomized, resulting in waste and uneven spraying; if the atomization rate is too high, the liquid is easy to condense at the nozzle, blocking the atomization port, and also affecting the chemical reaction and absorption effect of the liquid.

[0004] The traditional oscillation part uses the NE555 typical astable circuit to oscillate. The NE555 oscillation generates a driving signal with a fixed operating frequency. Disadvantages of NE555: 1. The output current is small, which is not suitable for directly driving high-power loads. It needs to be driven by an output buffer or other driving circuits. In addition, due to the limitations of its working principle, NE555 is not very suitable for high-frequency and high-precision applications. 2. The power consumption is relatively high. The power consumption of NE555 exceeds that of an NMOS chip, which may become a limitation of its application in some occasions with strict power consumption requirements. 3. Sensitive to static electricity. Although NE555 has many advantages, it is sensitive to static electricity, so special care should be taken during handling and use to avoid damage caused by static electricity. Summary of the invention

[0005] The invention provides a microgrid atomizer control circuit with high atomization rate to solve the existing problems.

[0006] To solve the above problems, the technical solution provided by the present invention is as follows: The embodiment of the present invention provides a microgrid atomizer control circuit with a high atomization rate, comprising a power supply, a single-chip microcomputer, a three-pin inductor, a MOS tube and a microgrid atomizer sheet, wherein the single-chip microcomputer is electrically connected to the power supply, and a pulse width modulation (PWM) signal of the single-chip microcomputer is electrically connected to the microgrid atomizer sheet through the three-pin inductor and the MOS tube; wherein the pulse width modulation (PWM) signal generates a high-frequency signal of a preset frequency, and the microgrid atomizer sheet is driven by the signal after the three-pin inductor is boosted, and the microgrid atomizer sheet generates high-frequency vibration, instantly decomposing water into fine water droplets, which are then sprayed out from the nozzle of the atomizer.

[0007] In an optional embodiment of the present invention, the single-chip microcomputer outputs a pulse width modulation (PWM) signal resonant frequency and a duty cycle through a PWM pin; the pulse width modulation (PWM) signal resonant frequency = the clock frequency of the single-chip microcomputer / (frequency division coefficient+1)×(T+1), and the pulse width modulation (PWM) signal duty cycle = the high level time / T, where T is the pulse width modulation (PWM) signal period.

[0008] In an optional embodiment of the present invention, the operating frequency of the microgrid atomizer is 108Khz, and the clock frequency of the single-chip microcomputer is the same as the operating frequency of the atomizer.

[0009] In an optional embodiment of the present invention, the single chip microcomputer directly outputs a resonance frequency of 108Khz through software control. The software controls the output of different duty cycles and outputs different voltages, thereby controlling the atomization rate of the microgrid atomization sheet.

[0010] In an optional embodiment of the present invention, the micro-mesh atomizer sheet includes a sieve plate having 970 funnel-shaped micropores and a piezoelectric ceramic sheet surrounding the sieve plate, wherein the piezoelectric ceramic sheet has a piezoelectric effect.

[0011] In an optional embodiment of the present invention, the signal after the tripod inductor is boosted drives the micro-mesh atomizer to vibrate at a frequency of 108kHz, driving the vibration of the sieve plate, so that the sieve plate moves up and down in the range of 0 to 1 μm. The energy of this vibration causes the drug solution to overflow through the funnel-shaped micropores to form atomized particles, and the generated aerosol is output through the pipe of the atomizer.

[0012] In an optional embodiment of the present invention, the power supply is directly provided by a power adapter with a power supply of 5V / 1A.

[0013] Compared with the prior art, the embodiment of the present invention provides a microgrid atomizer control circuit with a high atomization rate, which has the following beneficial effects: (1) Medical clinical experiments show that the best atomization rate is 0.15-0.45 ml / min. The atomization volume of the microgrid atomizer of the present invention can reach more than 0.30 ml / min, which can achieve the best atomization effect. (2) The pulse width modulation PWM signal of the present invention has the following advantages: High flexibility: PWM technology allows the single-chip microcomputer to generate analog signals in a digital manner, thereby realizing precise control of various devices. By adjusting the pulse width, the output voltage or current can be flexibly controlled; Energy saving: PWM technology can effectively reduce power consumption. When a lower output voltage or current is required, the overall power consumption can be reduced by reducing the pulse width instead of reducing the power supply voltage; Low hardware requirements: Compared with using a dedicated analog circuit, the single-chip microcomputer system using PWM technology has lower hardware requirements, which reduces the system cost; Easy to program and control: The generation and control of PWM signals are relatively simple, and most single-chip microcomputer programming languages ​​provide direct support for PWM functions; Enhanced noise resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 A schematic diagram of a microgrid atomizer control circuit with a high atomization rate provided in an embodiment of the present application.

[0016] Figure 2 A schematic diagram of a microgrid atomizer control circuit with a high atomization rate providing an embodiment of the present application generating a pulse width modulation PWM signal and driving an atomizer sheet.

[0017] Figure 3 A schematic diagram of a pulse width modulation (PWM) signal output by a single-chip microcomputer in a microgrid atomizer control circuit with a high atomization rate provided in an embodiment of the present application.

[0018] Figure 4 A schematic diagram of a power supply in a microgrid atomizer control circuit with a high atomization rate provided in an embodiment of the present application.

[0019] Figure 5 A schematic diagram of a circuit board and a maximum atomization rate in a microgrid atomizer control method with a high atomization rate provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0021] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a microgrid atomizer control circuit with a high atomization rate, including a power supply, a single-chip microcomputer, a three-pin inductor, a MOS tube and a microgrid atomizer sheet, the single-chip microcomputer is electrically connected to the power supply, and the pulse width modulation PWM signal of the single-chip microcomputer is electrically connected to the microgrid atomizer sheet through the three-pin inductor and the MOS tube; wherein the pulse width modulation PWM signal generates a high-frequency signal of a preset frequency, and the microgrid atomizer sheet is driven by the signal after the three-pin inductor is boosted, and the microgrid atomizer sheet generates high-frequency vibration, instantly decomposing water into fine water droplets, which are then sprayed out from the nozzle of the atomizer.

[0022] The single-chip microcomputer outputs the pulse width modulation (PWM) signal resonant frequency and duty cycle through the PWM pin; the pulse width modulation (PWM) signal resonant frequency = the clock frequency of the single-chip microcomputer / (frequency division coefficient + 1) × (T+1), the pulse width modulation (PWM) signal duty cycle = the high level time / T, where T is the pulse width modulation (PWM) signal period. The operating frequency of the microgrid atomizer is 108Khz, and the clock frequency of the single-chip microcomputer is the same as the operating frequency of the atomizer. The single-chip microcomputer of this embodiment directly outputs a resonant frequency of 108Khz through software control. The software controls the output of different duty cycles, and the output voltage is different, thereby controlling the atomization rate of the microgrid atomizer. The duty cycle of the pulse width modulation (PWM) signal wave is controlled by the above algorithm to change the atomization rate. Multiple tests have shown that when the duty cycle is about 30% to 60%, the atomization rate is 0.2mL / min to 0.5mL / min.

[0023] The micro-grid atomizer includes a sieve plate with 970 funnel-shaped micropores and a piezoelectric ceramic sheet surrounding the sieve plate, which has a piezoelectric effect. The signal after the three-leg inductor boost drives the micro-grid atomizer to vibrate at a frequency of 108kHz, driving the vibration of the sieve plate, so that the sieve plate moves up and down within the range of 0 to 1μm. The energy of this vibration causes the liquid medicine to overflow through the funnel-shaped micropores to form atomized particles, and the generated aerosol is output through the pipeline of the atomizer.

[0024] like Figure 4 As shown, the power supply is directly provided by the power adapter with a power supply of 5V / 1A.

[0025] The present invention also provides a microgrid atomizer control method with a high atomization rate, comprising the following steps: Step 1: The circuit board is electrically connected to the microgrid atomizer, and the power adapter provides power to the circuit board. Step 2: Select a brand new microgrid atomizer, and test the circuit board and the atomizer one-on-one. Step 3: The circuit board selects the maximum atomization gear and starts atomization. Step 4: According to the balance weighing method, the maximum atomization rate can be calculated. Step 5: The test results are as follows: Figure 5 shown.

[0026] Nominal atomization rate test: connect the atomization cup assembly (microgrid) to the inhalation accessory, inject physiological saline into the atomization cup to the maximum scale, the water temperature is 20℃±5℃, use an electronic balance with an accuracy of not less than 0.01g to weigh the total mass m1 of the atomization cup assembly (microgrid), inhalation accessory and water before atomization, start the atomizer, adjust the atomization rate to the maximum atomization gear, and record the time with a stopwatch while starting the machine. After atomization for 5 minutes, stop the machine, measure the total mass m2 of the atomization cup assembly (microgrid), inhalation accessory and remaining water after atomization, and calculate the atomization rate according to formula (1).

[0027] (1), where: A-nebulization rate, unit: mL / min; m1-total mass of nebulizer cup assembly (micronet), inhalation accessories and water before nebulization, unit: g; m2-total mass of nebulizer cup assembly (micronet), inhalation accessories and remaining water after nebulization for 5 min, unit: g. ρ-density of saline, unit: g / mL.

[0028] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A microgrid atomizer control circuit with high atomization rate, characterized in that: It includes a power supply, a single-chip microcomputer, a three-pin inductor, a MOS tube and a microgrid atomizer. The single-chip microcomputer is electrically connected to the power supply, and the pulse width modulation PWM signal of the single-chip microcomputer is electrically connected to the microgrid atomizer through the three-pin inductor and the MOS tube; wherein the pulse width modulation PWM signal generates a high-frequency signal of a preset frequency, and the microgrid atomizer is driven by the signal after the three-pin inductor is boosted, and the microgrid atomizer generates high-frequency vibration, which instantly decomposes water into fine water droplets, and then sprays them out from the nozzle of the atomizer.

2. A microgrid atomizer control circuit with high atomization rate according to claim 1, characterized in that: The single-chip microcomputer outputs the pulse width modulation (PWM) signal resonant frequency and duty cycle through the PWM pin; the pulse width modulation (PWM) signal resonant frequency = the clock frequency of the single-chip microcomputer / (frequency division coefficient + 1) × (T + 1), the pulse width modulation (PWM) signal duty cycle = high level time / T, where T is the pulse width modulation (PWM) signal period.

3. A microgrid atomizer control circuit with high atomization rate according to claim 2, characterized in that: The operating frequency of the microgrid atomizer is 108Khz, and the clock frequency of the single-chip microcomputer is the same as the operating frequency of the atomizer.

4. A microgrid atomizer control circuit with high atomization rate according to claim 3, characterized in that: The single chip microcomputer directly outputs a resonance frequency of 108Khz through software control. The software controls the output of different duty cycles and outputs different voltages, thereby controlling the atomization rate of the microgrid atomization sheet.

5. A microgrid atomizer control circuit with high atomization rate according to claim 1, characterized in that: The micro-mesh atomizer sheet comprises a sieve plate with 970 funnel-shaped micropores and a piezoelectric ceramic sheet surrounding the sieve plate, wherein the piezoelectric ceramic sheet has a piezoelectric effect.

6. A microgrid atomizer control circuit with high atomization rate according to claim 5, characterized in that: The signal after the three-leg inductor boosts the voltage drives the micro-mesh atomizer to vibrate at a frequency of 108kHz, driving the vibration of the sieve plate, so that the sieve plate moves up and down within the range of 0 to 1 μm. The energy of this vibration causes the liquid medicine to overflow through the funnel-shaped micropores to form atomized particles, and the generated aerosol is output through the pipeline of the atomizer.

7. A microgrid atomizer control circuit with high atomization rate according to claim 1, characterized in that: The power supply is directly provided by a power adapter with a power supply of 5V / 1A.

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