CN114669436B - Frequency modulation drive circuit, frequency modulation drive method, and drive device - Google Patents

Abstract

The invention provides a frequency modulation driving circuit, a frequency modulation driving method and a driving device, wherein the frequency modulation driving circuit can be connected with an atomizer and comprises the following components: a processor; the frequency tracking module is used for acquiring the working parameters of the atomizer, and the processor determines the resonant frequency of the atomizer according to the working parameters; the processor controls the frequency synthesis module to synchronously generate a first excitation signal with the signal frequency of resonance frequency; and the processor controls the power amplification module to adjust the first excitation signal into a driving signal of a target level and output the driving signal. According to the frequency modulation driving circuit provided by the invention, the resonance frequency change condition of the atomizer caused by temperature rise in the atomization process is monitored in real time through the frequency tracking module, and the frequency and amplitude parameters of the output excitation signal are adjusted according to the monitoring information, so that the energy utilization rate is improved, and the service life of the atomizer is prolonged.

Description

Frequency modulation drive circuit, frequency modulation drive method, and drive device

Technical field

The present invention relates to the technical field of radio frequency circuit design, and specifically to a frequency modulation driving circuit, a frequency modulation driving method, and a driving device.

Background technique

In recent years, the atomizer industry has developed rapidly and is widely used in medicine, precision chemistry and other fields. Among them, surface acoustic wave atomizers have low atomization power, simple drive circuit structure, are easy to be miniaturized, are portable and efficient, and have broad development prospects.

However, in the related technologies of the surface acoustic wave atomizer drive circuit, the design is not optimized based on the characteristics of the surface acoustic wave atomizer itself, which ignores the noise generated by the surface acoustic wave atomizer during the atomization process. The thermal effect affects the atomizer itself, so the atomizer's atomizing ability cannot be fully utilized. Specifically, the thermal effect of the surface acoustic wave atomizer is caused by the viscosity of the atomized liquid itself. During the atomization process, part of the acoustic energy of the incident liquid is converted into heat energy due to the viscosity factor, causing the surface temperature of the atomizer to rise, and then It changes the resonant frequency of the atomizer and reduces the energy utilization rate. At the same time, the thermal expansion effect and thermal stress caused by excessive temperature rise and cooling will also reduce the service life of the atomizer.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

To this end, a first aspect of the present invention is to propose a frequency modulation driving circuit.

A second aspect of the present invention is to propose a frequency modulation driving method.

A third aspect of the invention is to provide a driving device.

In view of this, the first aspect of the present invention provides a frequency modulation drive circuit. The frequency modulation drive circuit can be connected to an atomizer, including: a processor; a frequency tracking module for obtaining the working parameters of the atomizer, frequency tracking The first end of the module is connected to the processor, and the processor determines the resonant frequency of the atomizer according to the working parameters; the frequency synthesis module, the first end of the frequency synthesis module is connected to the processor, and the processor controls the frequency synthesis module to synchronously generate a signal frequency of The first excitation signal at the resonant frequency; the power amplification module, the input end of the power amplification module is connected to the second end of the frequency synthesis module, the output end of the power amplification module is connected to the atomizer, and the power amplification module is used to convert the first excitation signal Adjust the drive signal to the target level and output the drive signal.

The frequency modulation driving circuit provided by the present invention can be connected to the atomizer to provide a driving signal to the atomizer to drive the atomizer to work. Among them, the above-mentioned atomizer is specifically a surface acoustic wave atomizer. The particle size produced by the surface acoustic wave atomizer is inversely related to its vibration frequency. However, during the atomization process of the surface acoustic wave atomizer, the atomization The generated thermal effect changes the resonant frequency of the atomizer, thereby reducing the energy utilization of the atomizer and even damaging the service life of the atomizer. Therefore, the frequency modulation drive circuit provided by the present invention synchronously adjusts the frequency and amplitude of the output drive signal by monitoring changes in the resonant frequency of the atomizer, thereby controlling the heating and cooling speed of the atomizer, improving energy utilization and extending the atomization time. the service life of the device.

Specifically, the frequency modulation drive circuit provided by the present invention includes four main modules: a processor, a frequency tracking module, a frequency synthesis module and a power amplification module. Among them, the first end of the frequency tracking module is connected to the atomizer, the second end of the frequency tracking module is connected to the processor, the first end of the frequency synthesis module is connected to the processor, and the second end of the frequency synthesis module is connected to the power amplifier module The input end of the power amplifier module is connected to the atomizer, and the processor controls the work of other modules to output drive signals of corresponding frequency and amplitude to the atomizer to control the heating and cooling speed of the atomizer. This reduces the impact of temperature changes on the atomizer's atomization ability.

Specifically, the above-mentioned frequency tracking module is used to obtain the working parameters of the atomizer, and the processor determines the resonant frequency of the atomizer when it is working through the above-mentioned working parameters obtained by the frequency tracking module. After determining the resonant frequency of the atomizer, the processor controls the frequency synthesis module to generate a first excitation signal with a signal frequency of the above-mentioned resonant frequency by sending a control signal to the frequency synthesis module, that is, the frequency synthesis module continues to output a signal with a frequency of the above-mentioned resonant frequency. sine wave signal. The generated first excitation signal is transmitted to the power amplification module, and the processor controls the power amplification module to adjust the signal amplitude of the first excitation signal according to the determined resonant frequency to adjust the first excitation signal to a drive signal of the target level, and The driving signal is output to the atomizer to drive the atomizer to perform atomization work. In this way, the frequency and amplitude of the output drive signal are synchronously adjusted according to the resonant frequency of the atomizer, so that the output drive signal adapts to the resonant frequency of the atomizer, thereby controlling the heating and cooling speed of the atomizer and reducing the impact of temperature changes on the atomizer. The influence of the atomizer's atomization ability improves the energy utilization and extends the service life of the atomizer.

Further, during the working process of the atomizer, the processor monitors the changes in the resonant frequency of the atomizer caused by the temperature rise during the atomization process through the frequency tracking module in real time, and adjusts the control signal according to the monitoring information fed back by the frequency tracking module. The frequency synthesis module is used to control the signal frequency of the output excitation signal, and the power amplification module is controlled to adjust the signal amplitude (or signal power) of the output driving signal. In this way, during the operation of the atomizer, the driving signal of the atomizer adapts synchronously to the resonant frequency of the atomizer, reducing the temperature rise and fall speed of the atomizer, thereby reducing the impact of temperature changes on the atomization ability of the atomizer. , improves energy utilization and extends the service life of the atomizer.

Wherein, the above-mentioned processor may be specifically composed of a single-chip microcomputer.

Further, the frequency synthesis module is composed of a PLL (Phase Locked Loop), a DDS (DirectDigital Synthesizer) or an FPGA (Field Programmable Gate Array) frequency synthesizer. The specific composition of the frequency synthesis module can be selected according to the working frequency of the atomizer and the design requirements of the frequency tracking module, and there are no specific requirements here.

Further, the power amplification module may be composed of one or more stages of radio frequency power amplifier and an adjustable radio frequency attenuator for adjusting the amplification factor. Specifically, the power amplification module may be composed of a preamplifier, an adjustable radio frequency attenuator, and an output stage radio frequency power amplifier. Among them, the preamplifier can use one or more stages according to the output power of the frequency synthesis module used; the adjustable RF attenuator can use any form of attenuator such as voltage control or numerical control; the bandwidth of the output stage RF power amplifier and The gain can be selected according to the usage scenario of the atomizer and the atomization volume requirements, and it can also adopt one to multiple levels.

In addition, it should be noted that impedance matching is required between each stage of the power amplifier module and between each module. Among them, the first stage needs to be impedance matched with the frequency synthesis module, and the last stage needs to be impedance matched with the atomizer. In actual use, the impedance between each module and between the levels of the power amplifier module can be matched to 50 ohms by connecting capacitors and inductors in series and parallel.

Furthermore, the above-mentioned frequency modulation drive circuit may also include a power module. Specifically, the power module may be composed of a linear voltage regulator or a switching power supply, and the power module supplies power to other modules in the frequency modulation drive circuit. It should be noted that the power module can be a power module installed inside the frequency modulation drive circuit, or it can be an external power module, which is not specifically limited here.

Therefore, the frequency modulation drive circuit provided by the present invention determines the resonant frequency of the atomizer when it is working by obtaining the working parameters of the atomizer, and then controls the work of other modules through the processor to synchronously control the output according to the above resonant frequency. The frequency and amplitude (power) of the drive signal make the drive signal of the atomizer adapt to the resonant frequency of the atomizer, reducing the heating and cooling speed of the atomizer, thereby reducing the thermal effect generated by atomization on the atomizer fog. It improves the energy utilization rate and extends the service life of the atomizer.

In addition, the frequency modulation drive circuit in the above technical solution provided by the present invention can also have the following additional technical features:

In the above technical solution, the frequency tracking module includes: a first frequency detection module, and/or a second frequency detection module; wherein the first frequency detection module includes: a circulator or a directional coupler, connected to the atomizer, for Provides directional transmission of drive signals and reflection signals of the atomizer; power detection circuit, the input end of the power detection circuit is connected to the circulator or directional coupler, the output end of the power detection circuit is connected to the processor, and the power detection circuit is used to detect reflections The echo power of the signal is sent to the processor; the second frequency detection module includes: a temperature detection element, connected to the atomizer, used to detect the working temperature of the atomizer; a temperature detection circuit, connected to the temperature detection The components are connected to obtain the detected temperature value of the temperature detection component and send the detected temperature value to the processor.

In this technical solution, the above-mentioned frequency tracking module may include a first frequency detection module. Wherein, the first frequency detection module includes a power detection circuit, and a circulator or directional coupler for directional transmission of the driving signal and the reflected signal of the atomizer.

Specifically, the circulator (or directional coupler) is connected to the power amplifier module, the power detection circuit and the external atomizer, and the driving signal output by the power amplifier module is transmitted to the atomizer in one direction through the circulator (or directional coupler) It works by driving the atomizer, and the reflected signal of the atomizer is transmitted to the power detection circuit in one direction through the circulator (or directional coupler). The power detection circuit is connected to the processor and is used to detect the echo power of the reflected signal and feed the detection result back to the processor so that the processor can determine the resonant frequency of the atomizer based on the detection result of the echo power. In this way, the resonant frequency of the atomizer is determined based on the echo power of the reflected signal from the atomizer, ensuring the timeliness and accuracy of the resonant frequency determination, thereby ensuring the effectiveness of the drive signal output to control the heating and cooling of the atomizer. speed, thereby reducing the impact of temperature changes on the atomizer's atomization ability, improving energy utilization and extending the service life of the atomizer.

In addition, in the actual application process, the driving signal output by the power amplifier module and the reflected signal of the atomizer can also be separated by a radio frequency switch.

In this technical solution, further, the above-mentioned frequency tracking module may further include a second frequency detection module. Wherein, the second frequency detection module includes a temperature detection element and a temperature detection circuit connected thereto.

Specifically, the temperature detection element is connected to the atomizer for detecting the working temperature of the atomizer, and sends the detection result to the temperature detection circuit. The temperature detection circuit obtains the detection temperature value of the temperature detection element and then sends the detection temperature value. Feedback to the processor for the processor to determine the resonant frequency of the atomizer based on the operating temperature of the atomizer. In this way, the resonant frequency of the atomizer is determined according to the working temperature of the atomizer. The structure is simple, ensuring the effectiveness of the driving signal, reducing the heating and cooling speed of the atomizer, thereby reducing the impact of temperature changes on the atomizer mist. It improves the energy utilization rate and extends the service life of the atomizer.

It should be noted that the above-mentioned temperature detection element can be a temperature detection element arranged inside the frequency modulation drive circuit, or it can be an external temperature detection element, and the signal is transmitted through wires or wireless connections. Specifically, the above-mentioned temperature detection elements can use thermocouples of K, E, J, N, B, S, R, T and other types, or thermal resistors of Pt1000, Pt100, Pt10, Cu50, Cu100 and other types. The installation position and specific type of the temperature detection element can be set according to the actual situation, and there are no specific restrictions here.

In this technical solution, further, the above-mentioned frequency tracking module may also include the above-mentioned first frequency detection module and the second frequency detection module at the same time. In this way, when the processor determines the resonant frequency of the atomizer according to the working parameters of the atomizer, , obtain the working temperature of the atomizer, the echo power of the reflected signal and other parameters through the frequency tracking module, and then determine the resonant frequency of the atomizer based on the factors of temperature and power, ensuring the timeliness and accuracy of the resonant frequency determination. Accuracy, thereby ensuring the accurate execution of the processor's control work and the effectiveness of the drive signal, thus reducing the heating and cooling speed of the atomizer, reducing the impact of temperature changes on the atomization ability of the atomizer, and increasing energy Utilization rate, extending the service life of the atomizer.

In any of the above technical solutions, when the frequency tracking module includes the first frequency detection module, the processor is specifically configured to: receive the echo power, determine the target frequency point when the echo power is minimum through frequency sweep processing; The frequency corresponding to the frequency point is determined as the resonant frequency.

In this technical solution, when the above-mentioned frequency tracking module only includes the first frequency detection module, when the processor determines the resonant frequency of the atomizer according to the working parameters of the atomizer, it can be specifically determined in the following manner: Receive the echo power of the reflected signal fed back by the power detection circuit, and then determine the target frequency point when the echo power is minimum through frequency sweep processing, and determine the frequency corresponding to the target frequency point as the above-mentioned resonant frequency. In this way, the resonant frequency of the atomizer is determined by detecting the echo power and frequency scanning, ensuring the timeliness and accuracy of the resonant frequency determination, thereby ensuring the effectiveness of the drive signal output to control the heating and cooling of the atomizer speed, thereby reducing the impact of temperature changes on the atomizer's atomization ability, improving energy utilization and extending the service life of the atomizer.

Among them, it should be noted that when performing frequency sweep processing, the scanning direction needs to be selected according to the temperature coefficient of the atomizer. Specifically, for an atomizer with a negative temperature coefficient, during the heating process, the current output frequency is used as the starting frequency to scan down a certain bandwidth for frequency sweep. During the cooling process, the current output frequency is used as the starting frequency. Sweep the frequency by scanning a certain bandwidth upward from the starting frequency. For an atomizer with a positive temperature coefficient, the frequency sweep method is opposite to that of an atomizer with a negative temperature coefficient.

For example, for a surface acoustic wave atomizer made of Y-cut 128 lithium niobate, during the heating process, the current output frequency is used as the starting frequency, and the downward sweep is 300KHz at intervals of 25KHz; during the cooling process, the current output frequency is used as the starting frequency. The frequency is the starting frequency and sweeps upward to 300KHz at intervals of 25KHz.

In any of the above technical solutions, when the frequency tracking module includes a second frequency detection module, the processor is specifically configured to: receive the detected temperature value; and determine the resonant frequency according to the detected temperature value and the preset frequency temperature curve.

In this technical solution, when the above-mentioned frequency tracking module only includes the second frequency detection module, when the processor determines the resonant frequency of the atomizer according to the working parameters of the atomizer, it can be specifically determined in the following manner: The detected temperature value fed back by the temperature detection circuit (that is, the working temperature of the atomizer) is received in real time, and the current resonant frequency of the atomizer is determined based on the detected temperature value and the pre-stored frequency temperature curve. In this way, the resonant frequency of the atomizer is determined through the real-time acquisition of the working temperature of the atomizer combined with the preset frequency temperature curve. The structure is simple, ensuring the effectiveness of the driving signal and reducing the temperature rise and fall speed of the atomizer. This reduces the impact of temperature changes on the atomizer's atomization ability, improves energy utilization, and extends the service life of the atomizer.

Among them, the above-mentioned preset frequency temperature curve is related to the type and performance of the atomizer. According to the type and performance of the atomizer, the obtained frequency temperature curve is also different. For example, for a Y-cut 128 lithium niobate base atomizer, the frequency and temperature characteristics of this type of atomizer can be found after testing: for every 10°C increase in the atomizer temperature, its resonant frequency decreases by approximately 7100Hz. According to this frequency temperature Characteristics can be used to obtain the frequency-temperature curve of this type of atomizer (Y-cut 128 lithium niobate base atomizer), and pre-store it in the local storage of the frequency modulation drive circuit for subsequent recall.

In any of the above technical solutions, in the case where the frequency tracking module includes a first frequency detection module and a second power detection module, the processor is specifically configured to: receive the echo power and detected temperature value; according to the detected temperature value and the preset The frequency temperature curve determines the target frequency range; through frequency sweep processing, the frequency corresponding to the frequency point with the smallest echo power in the target frequency range is determined to be the resonant frequency.

In this technical solution, when the above-mentioned frequency tracking module includes both a first frequency detection module and a second frequency detection module, when the processor determines the resonant frequency of the atomizer according to the working parameters of the atomizer, the specific method can be: Determination is made in the following way: the echo power of the reflected signal fed back by the received power detection circuit, and the detected temperature value fed back by the temperature detection circuit (that is, the operating temperature of the atomizer), based on the detected temperature value and the pre-stored The frequency-temperature curve determines a target frequency range, and then a frequency point with minimum echo power is determined within the above target frequency range through frequency sweep processing, and the frequency corresponding to this frequency point is determined as the resonant frequency of the atomizer. In this way, the approximate range of the resonant frequency is determined based on the working temperature of the atomizer and the preset frequency-temperature curve, and then the precise value of the resonant frequency is determined through frequency sweep processing, ensuring the timeliness and accuracy of the resonant frequency determination. It ensures the accuracy of the processor control work and the effectiveness of the drive signal, thereby reducing the temperature rise and fall speed of the atomizer, reducing the impact of temperature changes on the atomizer's atomization ability, improving energy utilization, and prolonging the extends the service life of the atomizer.

In any of the above technical solutions, the processor is also used to: during the atomization heating process, determine the heating rate of the atomizer according to the resonant frequency of the atomizer and the preset frequency temperature curve; based on the heating rate being greater than the first threshold, Reduce the drive signal output power.

In this technical solution, during the atomization and heating process, the above-mentioned processor can also determine the heating rate of the atomizer based on the determined resonant frequency of the atomizer and the pre-stored frequency temperature curve, and then during the heating of the atomizer When the rate is greater than the first threshold, the output power of the driving signal is reduced. In this way, the processor can also be used to determine the heating rate of the atomizer. If the heating rate of the atomizer is too fast, the output power of the driving signal is reduced to slow down the heating rate of the atomizer to prevent rapid temperature rise. Thermal expansion and thermal stress damage the atomizer, extending the service life of the atomizer and improving the overall performance of the atomizer.

Wherein, the above-mentioned first threshold value may specifically be 5°C/s. During the atomization and heating process of the atomizer, once the processor detects that the heating rate of the atomizer exceeds the above-mentioned threshold value, it will consider that the heating rate of the atomizer is If it is too fast, it will control the work of other modules to reduce the output power of the driving signal, thereby slowing down the heating rate of the atomizer.

In any of the above technical solutions, the power amplification module includes a radio frequency attenuator. The radio frequency attenuator is connected to the processor. The processor is specifically used to: control the radio frequency attenuator to reduce the signal power of the first excitation signal to reduce the output power of the driving signal. ; Or control the frequency synthesis module to adjust the output duty cycle of the first excitation signal to reduce the output power of the driving signal.

In this technical solution, the power amplification module includes a radio frequency attenuator, which is connected to the processor. When the output power of the driving signal is reduced to slow down the heating rate of the atomizer, the processor can control the radio frequency attenuator to The signal power of the first excitation signal is reduced, thereby reducing the output power of the driving signal. At the same time, the processor can also reduce the output power of the first excitation signal by controlling the frequency synthesis module to adjust the output duty cycle of the first excitation signal, thereby reducing the output power of the driving signal. In this way, when the heating rate of the atomizer is too fast, the output power of the driving signal is reduced by reducing the signal power of the first excitation signal or adjusting the output duty cycle of the first excitation signal, thereby slowing down the atomization. The heating speed of the atomizer is adjusted to prevent thermal expansion and thermal stress caused by rapid heating from damaging the atomizer, extending the service life of the atomizer and improving the overall performance of the atomizer.

In any of the above technical solutions, the processor is also used to: during the cooling process at the end of atomization, determine the cooling rate of the atomizer based on the resonant frequency of the atomizer and the preset frequency temperature curve; based on the cooling rate is greater than the second The threshold value controls the frequency synthesis module to generate a second excitation signal, wherein the power of the second excitation signal is smaller than the power of the first excitation signal.

In this technical solution, during the cooling process at the end of atomization, the above-mentioned processor can also determine the cooling rate of the atomizer based on the determined resonant frequency of the atomizer and the pre-stored frequency temperature curve, and then determine the cooling rate of the atomizer during the cooling process. When the cooling rate is greater than the second threshold, the frequency synthesis module is controlled to generate a second excitation signal, where the signal power of the second excitation signal is smaller than the signal power of the first excitation signal. In this way, the processor can also be used to determine the cooling situation of the atomizer. When the cooling rate of the atomizer is too fast, the atomizer can be appropriately stimulated through a low-power excitation signal (ie, the second excitation signal), so that the atomizer can A certain amount of heat is generated without atomization, thereby preventing the atomizer from cooling too quickly and damaging the atomizer, extending the service life of the atomizer, and improving the overall performance of the atomizer.

Wherein, the above-mentioned second threshold can be the same as the above-mentioned first threshold, that is, 5°C/s. During the cooling process of the atomizer, once the processor detects that the cooling rate of the atomizer exceeds the above-mentioned threshold, it will consider that The cooling rate of the atomizer is too fast, and the atomizer is appropriately stimulated by a low-power excitation signal to generate a certain amount of heat, thereby slowing down the cooling rate of the atomizer.

A second aspect of the present invention provides a frequency modulation driving method, which is used in the frequency modulation driving circuit in any technical solution of the first aspect. The frequency modulation driving method includes: obtaining the working parameters of the atomizer; determining the fog according to the working parameters. the resonant frequency of the converter; synchronously generates a first excitation signal whose signal frequency is the resonant frequency; adjusts the first excitation signal to a drive signal of a target level, and outputs the drive signal.

The frequency modulation driving method provided by the present invention is implemented by the frequency modulation driving circuit in any of the above technical solutions, wherein the above frequency modulation driving circuit can be connected to the atomizer to provide a driving signal to the atomizer to drive the atomizer to work. Specifically, the above-mentioned atomizer is a surface acoustic wave atomizer. The particle size produced by the surface acoustic wave atomizer is inversely related to its vibration frequency. However, during the atomization process of the surface acoustic wave atomizer, the atomization The generated thermal effect changes the resonant frequency of the atomizer, thereby reducing the energy utilization of the atomizer and even damaging the service life of the atomizer.

Therefore, in the frequency modulation driving method provided by the present invention, the working parameters of the atomizer are obtained in real time through the frequency tracking module, and then the current resonant frequency of the atomizer is determined by the processor according to the above working parameters, and a control signal is generated to control The frequency synthesis module synchronously generates a first excitation signal whose signal frequency is the above-mentioned resonant frequency, that is, the frequency synthesis module is controlled to continuously output a sine wave signal whose signal frequency is the above-mentioned resonant frequency. On this basis, the generated first excitation signal is transmitted to the power amplification module, and the processor controls the power amplification module to adjust the signal amplitude of the first excitation signal according to the determined resonant frequency to adjust the first excitation signal to the target level. drive signal, and output the drive signal to the atomizer to drive the atomizer to perform atomization work. In this way, the frequency and amplitude of the output drive signal are synchronously adjusted according to the resonant frequency of the atomizer, so that the output drive signal adapts to the resonant frequency of the atomizer, thereby controlling the heating and cooling speed of the atomizer and reducing the impact of temperature changes on the atomizer. The influence of the atomizer's atomization ability improves the energy utilization and extends the service life of the atomizer.

Further, during the working process of the atomizer, the processor monitors the changes in the resonant frequency of the atomizer caused by the temperature rise during the atomization process through the frequency tracking module in real time, and adjusts the control signal according to the monitoring information fed back by the frequency tracking module. The frequency synthesis module is used to control the signal frequency of the output excitation signal, and the power amplification module is controlled to adjust the signal amplitude (or signal power) of the output driving signal. In this way, during the operation of the atomizer, the driving signal of the atomizer adapts synchronously to the resonant frequency of the atomizer, reducing the temperature rise and fall speed of the atomizer, thereby reducing the impact of temperature changes on the atomization ability of the atomizer. , improves energy utilization and extends the service life of the atomizer.

Therefore, the frequency modulation driving method provided by the present invention determines the resonant frequency of the atomizer when it is working according to the working parameters of the atomizer, and then synchronously adjusts the frequency and amplitude (power) of the output driving signal according to the changes in the resonant frequency. The drive signal of the atomizer is adapted to the resonant frequency of the atomizer, which reduces the heating and cooling speed of the atomizer, thus reducing the impact of the thermal effect generated by atomization on the atomization ability of the atomizer and improving the energy utilization rate. , extending the service life of the atomizer.

In addition, the frequency modulation driving method provided by the present invention is realized by the frequency modulation driving circuit in any technical solution of the first aspect. Therefore, the frequency modulation driving method provided by the present invention has the frequency modulation driving circuit in any technical solution of the first aspect. All the beneficial effects will not be repeated here.

A third aspect of the present invention provides a driving device, including: a frequency modulation driving circuit as in any technical solution of the above-mentioned first aspect. Therefore, the driving device provided by the present invention has all the beneficial effects of the frequency modulation driving circuit in any technical solution of the first aspect, and will not be described again here.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of the drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

Figure 1 shows one of the structural schematic diagrams of a frequency modulation drive circuit according to an embodiment of the present invention;

Figure 2 shows the second structural schematic diagram of the frequency modulation drive circuit according to an embodiment of the present invention;

Figure 3 shows the third structural schematic diagram of the frequency modulation drive circuit according to an embodiment of the present invention;

Figure 4 shows a schematic flow chart of a frequency modulation driving method according to an embodiment of the present invention;

Figure 5 shows a structural block diagram of a driving device according to an embodiment of the present invention;

Figure 6 shows a frequency temperature graph according to an embodiment of the invention.

Among them, the corresponding relationship between the reference signs and component names in Figures 1 to 3 is:

100 FM drive circuit, 110 processor, 120 frequency tracking module, 122 circulator, 124 power detection circuit, 126 temperature detection component, 128 temperature detection circuit, 130 frequency integration module, 140 power amplifier module, 142 preamplifier, 144 radio frequency Attenuator, 146 output stage RF power amplifier.

Detailed ways

In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, as long as there is no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. Limitations of Examples.

The following describes the frequency modulation driving circuit, frequency modulation driving method, and driving device proposed according to some embodiments of the present invention with reference to FIGS. 1 to 6 . Among them, the dotted lines in Figures 1 to 3 represent the power supply lines of the power module, and the solid lines represent the connection relationships or signal transmission paths of each module of the frequency modulation drive circuit.

An embodiment of the first aspect of the present invention provides a frequency modulation driving circuit. In some embodiments of the present invention, as shown in Figure 1, a frequency modulation drive circuit 100 is provided. The frequency modulation drive circuit 100 can be connected to an atomizer to provide a drive signal to the atomizer to drive the atomizer to work. .

Among them, the above-mentioned atomizer is specifically a surface acoustic wave atomizer. The particle size produced by the surface acoustic wave atomizer is inversely related to its vibration frequency. However, during the atomization process of the surface acoustic wave atomizer, the atomization The generated thermal effect changes the resonant frequency of the atomizer, thereby reducing the energy utilization of the atomizer and even damaging the service life of the atomizer. Therefore, the frequency modulation drive circuit 100 provided by the present invention synchronously adjusts the frequency and amplitude of the output drive signal by monitoring changes in the resonant frequency of the atomizer, thereby controlling the heating and cooling speed of the atomizer, improving energy utilization and extending the duration of the atomizer. the service life of the vaporizer.

Therefore, in this embodiment, as shown in FIG. 1 , the frequency modulation driving circuit 100 includes four main modules: a processor 110 , a frequency tracking module 120 , a frequency synthesis module 130 and a power amplification module 140 . Among them, the first end of the frequency tracking module 120 is connected to the atomizer, the second end of the frequency tracking module 120 is connected to the processor 110, the first end of the frequency integration module 130 is connected to the processor 110, and the third end of the frequency integration module 130 is connected to the processor 110. The two ends are connected to the input end of the power amplification module 140, and the output end of the power amplification module 140 is connected to the atomizer. The processor 110 controls the work of other modules to output driving signals of corresponding frequency and amplitude to the atomizer, so as to Control the heating and cooling speed of the atomizer to reduce the impact of temperature changes on the atomizer's atomization ability.

Specifically, the frequency tracking module 120 is used to obtain the operating parameters of the atomizer, and the processor 110 uses the operating parameters obtained by the frequency tracking module 120 to determine the resonant frequency of the atomizer when it is operating. After determining the resonant frequency of the atomizer, the processor 110 controls the frequency synthesis module 130 to generate a first excitation signal whose signal frequency is the above-mentioned resonant frequency by sending a control signal to the frequency synthesis module 130, that is, the frequency synthesis module 130 is controlled to continuously output the signal frequency. is the sine wave signal at the above resonant frequency. The generated first excitation signal is transmitted to the power amplification module 140. The processor 110 controls the power amplification module 140 to adjust the signal amplitude of the first excitation signal according to the determined resonant frequency, so as to adjust the first excitation signal to a target level driving signal. , and output the driving signal to the atomizer to drive the atomizer to perform atomization work. In this way, the frequency and amplitude of the output drive signal are synchronously adjusted according to the resonant frequency of the atomizer, so that the output drive signal adapts to the resonant frequency of the atomizer, thereby controlling the heating and cooling speed of the atomizer and reducing the impact of temperature changes on the atomizer. The influence of the atomizer's atomization ability improves the energy utilization and extends the service life of the atomizer.

Further, during the operation of the atomizer, the processor 110 monitors the changes in the resonant frequency of the atomizer caused by the temperature rise in the atomization process through the frequency tracking module 120 in real time, and adjusts the frequency according to the monitoring information fed back by the frequency tracking module 120 The control signal is used to control the frequency synthesis module 130 to adjust the signal frequency of the output excitation signal, and to control the power amplification module 140 to adjust the signal amplitude (or signal power) of the output driving signal. In this way, during the operation of the atomizer, the driving signal of the atomizer adapts synchronously to the resonant frequency of the atomizer, reducing the temperature rise and fall speed of the atomizer, thereby reducing the impact of temperature changes on the atomization ability of the atomizer. , improves energy utilization and extends the service life of the atomizer.

Wherein, the above-mentioned processor 110 may be specifically composed of a single-chip microcomputer.

Further, the frequency synthesis module 130 is composed of a PLL, DDS or FPGA frequency synthesizer. The specific structure of the frequency synthesis module 130 can be selected according to the working frequency of the atomizer and the design requirements of the frequency tracking module 120, and no specific requirements are made here.

Further, the power amplification module 140 may be composed of one or more stages of radio frequency power amplifier, and an adjustable radio frequency attenuator 144 for adjusting the amplification factor. Specifically, as shown in FIGS. 2 and 3 , the power amplification module 140 may be composed of a preamplifier 142 , an adjustable radio frequency attenuator 144 and an output stage radio frequency power amplifier 146 . Among them, the preamplifier 142 can use one or more stages according to the output power of the frequency synthesis module 130 used; the adjustable radio frequency attenuator 144 can be any form of attenuator such as voltage control or numerical control; the output stage radio frequency power amplifier The bandwidth and gain of 146 can be selected according to the usage scenario of the atomizer and the atomization volume requirements. It can also use one to multiple levels.

In addition, it should be noted that impedance matching is required between all stages of the power amplification module 140 and between each module. Among them, the first stage needs to perform impedance matching with the frequency synthesis module 130, and the last stage needs to perform impedance matching with the atomizer. In actual use, the impedances between the modules and between the stages of the power amplification module 140 can be matched to 50 ohms by connecting capacitors and inductors in series and parallel.

Furthermore, the above-mentioned frequency modulation drive circuit 100 may also include a power module. Specifically, the power module may be composed of a linear voltage regulator or a switching power supply, and the power module supplies power to other modules in the frequency modulation drive circuit 100. It should be noted that the power module can be a power module installed inside the frequency modulation drive circuit 100 or an external power module, which is not specifically limited here.

Therefore, the frequency modulation drive circuit 100 provided by the present invention determines the resonant frequency when the atomizer is working by obtaining the working parameters of the atomizer, and then controls the work of other modules through the processor 110 to synchronously control according to the above resonant frequency. The frequency and amplitude (power) of the output drive signal make the drive signal of the atomizer adapt to the resonant frequency of the atomizer, reducing the heating and cooling speed of the atomizer, thereby reducing the thermal effect generated by atomization against atomization The effect of the atomizer's atomization ability is improved, the energy utilization rate is improved, and the service life of the atomizer is extended.

In some embodiments of the present invention, further, as shown in Figure 2, the above-mentioned frequency tracking module 120 includes a first frequency detection module. The first frequency detection module includes a power detection circuit 124 and a circulator 122 for directional transmission of the driving signal and the reflected signal of the atomizer.

Specifically, as shown in Figure 2, the circulator 122 is connected to the power amplification module 140, the power detection circuit 124 and the external atomizer. The driving signal output by the power amplification module 140 is transmitted to the atomizer in one direction through the circulator 122. The atomizer is driven to work, and the reflected signal of the atomizer is transmitted to the power detection circuit 124 through the circulator 122 in one direction. The power detection circuit 124 is connected to the processor 110 for detecting the echo power of the reflected signal, and feeding the detection result back to the processor 110 so that the processor 110 determines the resonant frequency of the atomizer based on the detection result of the echo power. In this way, the resonant frequency of the atomizer is determined based on the echo power of the reflected signal from the atomizer, ensuring the timeliness and accuracy of the resonant frequency determination, thereby ensuring the effectiveness of the drive signal output to control the heating and cooling of the atomizer. speed, thereby reducing the impact of temperature changes on the atomizer's atomization ability, improving energy utilization and extending the service life of the atomizer.

In addition, during actual application, the driving signal output by the power amplifier module 140 and the reflected signal of the atomizer can also be separated by a directional coupler or a radio frequency switch.

In some embodiments of the present invention, further, as shown in Figure 3, the above-mentioned frequency tracking module 120 includes a second frequency detection module. The second frequency detection module includes a temperature detection element 126 and a temperature detection circuit 128 connected thereto.

Specifically, as shown in Figure 3, the temperature detection element 126 is connected to the atomizer for detecting the working temperature of the atomizer, and sends the detection result to the temperature detection circuit 128. The temperature detection circuit 128 obtains the temperature detection element 126 The detected temperature value is then fed back to the processor 110 so that the processor 110 can determine the resonant frequency of the atomizer according to the operating temperature of the atomizer. In this way, the resonant frequency of the atomizer is determined according to the working temperature of the atomizer. The structure is simple, ensuring the effectiveness of the driving signal, reducing the temperature rise and fall speed of the atomizer, thereby reducing the impact of temperature changes on the atomizer mist. It improves the energy utilization rate and extends the service life of the atomizer.

It should be noted that the above-mentioned temperature detection element 126 can be a temperature detection element 126 disposed inside the frequency modulation drive circuit 100, or an external temperature detection element 126, which realizes signal transmission through wires or wireless connections. Specifically, the above-mentioned temperature detection element 126 may use thermocouples of K, E, J, N, B, S, R, T and other types, or thermal resistors of Pt1000, Pt100, Pt10, Cu50, Cu100 and other types. The installation position and specific type of the temperature detection element 126 can be set according to the actual situation, and are not specifically limited here.

In some embodiments of the present invention, further, the above-mentioned frequency tracking module 120 may include the above-mentioned first frequency detection module and the second frequency detection module at the same time. In this way, the processor 110 determines the atomizer according to the working parameters of the atomizer. When the resonant frequency is reached, parameters such as the operating temperature of the atomizer and the echo power of the reflected signal are obtained through the frequency tracking module 120, and then the resonant frequency of the atomizer is determined based on the factors of temperature and power to ensure the resonant frequency. The timeliness and accuracy of the determination ensure the accurate control work of the processor 110 and the effectiveness of the driving signal, thereby reducing the temperature rise and fall speed of the atomizer and reducing the impact of temperature changes on the atomization ability of the atomizer. influence, improve energy utilization and extend the service life of the atomizer.

In some embodiments of the present invention, further, when the frequency tracking module 120 includes a first frequency detection module, the processor 110 is specifically configured to: receive the echo power, and determine the time when the echo power is minimum through frequency sweep processing. Target frequency point; determine the frequency corresponding to the target frequency point as the resonant frequency.

In this embodiment, when the frequency tracking module 120 only includes the first frequency detection module, when the processor 110 determines the resonant frequency of the atomizer according to the working parameters of the atomizer, it may be performed in the following manner. Determine: receive the echo power of the reflected signal fed back by the power detection circuit 124, determine the target frequency point when the echo power is minimum through frequency sweep processing, and determine the frequency corresponding to the target frequency point as the above-mentioned resonant frequency. In this way, the resonant frequency of the atomizer is determined by detecting the echo power and frequency scanning, ensuring the timeliness and accuracy of the resonant frequency determination, thereby ensuring the effectiveness of the drive signal output to control the heating and cooling of the atomizer speed, thereby reducing the impact of temperature changes on the atomizer's atomization ability, improving energy utilization and extending the service life of the atomizer.

Among them, it should be noted that when performing frequency sweep processing, the scanning direction needs to be selected according to the temperature coefficient of the atomizer. Specifically, for an atomizer with a negative temperature coefficient, during the heating process, the current output frequency is used as the starting frequency to scan down a certain bandwidth for frequency sweep. During the cooling process, the current output frequency is used as the starting frequency. Sweep the frequency by scanning a certain bandwidth upward from the starting frequency. For an atomizer with a positive temperature coefficient, the frequency sweep method is opposite to that of an atomizer with a negative temperature coefficient.

For example, for a surface acoustic wave atomizer made of Y-cut 128 lithium niobate, during the heating process, the current output frequency is used as the starting frequency, and the downward sweep is 300KHz at intervals of 25KHz; during the cooling process, the current output frequency is used as the starting frequency. The frequency is the starting frequency and sweeps upward to 300KHz at intervals of 25KHz.

In some embodiments of the present invention, further, in the case where the frequency tracking module 120 includes a second frequency detection module, the processor 110 is specifically configured to: receive a detected temperature value; and determine based on the detected temperature value and the preset frequency temperature curve. Resonant frequency.

In this embodiment, when the frequency tracking module 120 only includes the second frequency detection module, when the processor 110 determines the resonant frequency of the atomizer according to the working parameters of the atomizer, it may be performed in the following manner. Determine: receive the detected temperature value (that is, the working temperature of the atomizer) fed back by the temperature detection circuit 128 in real time, and determine the current resonant frequency of the atomizer based on the detected temperature value and the pre-stored frequency temperature curve. In this way, the resonant frequency of the atomizer is determined through the real-time acquisition of the working temperature of the atomizer combined with the preset frequency temperature curve. The structure is simple, ensuring the effectiveness of the driving signal and reducing the temperature rise and fall speed of the atomizer. This reduces the impact of temperature changes on the atomizer's atomization ability, improves energy utilization, and extends the service life of the atomizer.

Among them, the above-mentioned preset frequency temperature curve is related to the type and performance of the atomizer. According to the type and performance of the atomizer, the obtained frequency temperature curve is also different. For example, as shown in Figure 6, for a Y-cut 128 lithium niobate base atomizer, after testing, the frequency and temperature characteristics of this type of atomizer are: for every 10°C increase in the atomizer temperature, its resonant frequency decreases by approximately 7100Hz. According to the frequency temperature characteristics, the frequency temperature curve of this type of atomizer (Y-cut 128 lithium niobate base atomizer) can be obtained, and it is pre-stored in the local storage of the frequency modulation drive circuit 100 for subsequent use. transfer. As shown in Figure 6, for the Y-cut 128 lithium niobate base atomizer, the correlation function between the temperature and the resonant frequency is: y=-708.9x+13775, where y represents the temperature of the atomizer and x represents The resonant frequency of the atomizer.

In some embodiments of the present invention, further, in the case where the frequency tracking module 120 includes a first frequency detection module and a second power detection module, the processor 110 is specifically configured to: receive the echo power and detect the temperature value; according to The temperature value and the preset frequency temperature curve are detected to determine the target frequency range; through frequency sweep processing, the frequency corresponding to the frequency point with the smallest echo power in the target frequency range is determined to be the resonant frequency.

In this embodiment, when the frequency tracking module 120 includes both a first frequency detection module and a second frequency detection module, when the processor 110 determines the resonant frequency of the atomizer according to the working parameters of the atomizer, specifically The determination can be made in the following manner: the echo power of the reflected signal fed back by the received power detection circuit 124, and the detected temperature value fed back by the temperature detection circuit 128 (that is, the operating temperature of the atomizer). According to the detected temperature value And the pre-stored frequency temperature curve determines a target frequency interval, and then determines a frequency point with the minimum echo power within the above target frequency interval through frequency sweep processing, and determines the frequency corresponding to this frequency point as the resonance of the atomizer frequency. In this way, the approximate range of the resonant frequency is determined based on the working temperature of the atomizer and the preset frequency-temperature curve, and then the precise value of the resonant frequency is determined through frequency sweep processing, ensuring the timeliness and accuracy of the resonant frequency determination. This ensures the accurate execution of the control work of the processor 110 and the effectiveness of the driving signal, thereby reducing the temperature rise and fall speed of the atomizer, reducing the impact of temperature changes on the atomization ability of the atomizer, and improving energy utilization. Extends the service life of the atomizer.

In some embodiments of the present invention, further, the above-mentioned processor 110 is also used to: during the atomization heating process, determine the heating rate of the atomizer according to the resonant frequency of the atomizer and the preset frequency temperature curve; If the rate is greater than the first threshold, the driving signal output power is reduced.

In this embodiment, during the atomization heating process, the above-mentioned processor 110 can also determine the heating rate of the atomizer based on the determined resonant frequency of the atomizer and the pre-stored frequency temperature curve, and then determine the heating rate of the atomizer. When the temperature rise rate is greater than the first threshold, the output power of the driving signal is reduced. In this way, the processor 110 can also be used to determine the temperature rise of the atomizer. If the temperature rise rate of the atomizer is too fast, reduce the output power of the drive signal to slow down the temperature rise of the atomizer to prevent rapid temperature rise. The generated thermal expansion and thermal stress damage the atomizer, extend the service life of the atomizer, and improve the overall performance of the atomizer.

The above-mentioned first threshold may specifically be 5°C/s. During the atomization and heating process of the atomizer, once the processor 110 detects that the atomizer's heating rate exceeds the above-mentioned threshold, it will consider that the atomizer's temperature rises. The rate is too fast, and then controls the work of other modules to reduce the output power of the driving signal, thereby slowing down the heating rate of the atomizer.

In some embodiments of the present invention, the power amplification module 140 further includes a radio frequency attenuator 144. The radio frequency attenuator 144 is connected to the processor 110. The processor 110 is specifically configured to: control the radio frequency attenuator 144 to reduce the intensity of the first excitation signal. signal power to reduce the output power of the driving signal; or control the frequency synthesis module 130 to adjust the output duty cycle of the first excitation signal to reduce the output power of the driving signal.

In this embodiment, the power amplification module 140 includes a radio frequency attenuator 144, which is connected to the processor 110. When the output power of the driving signal is reduced to slow down the heating rate of the atomizer, the processor 110 can The radio frequency attenuator 144 is controlled to reduce the signal power of the first excitation signal, thereby reducing the output power of the drive signal. At the same time, the processor 110 can also reduce the output power of the first excitation signal by controlling the frequency synthesis module 130 to adjust the output duty cycle of the first excitation signal, thereby reducing the output power of the driving signal. In this way, when the heating rate of the atomizer is too fast, the output power of the driving signal is reduced by reducing the signal power of the first excitation signal or adjusting the output duty cycle of the first excitation signal, thereby slowing down the atomization. The heating speed of the atomizer is adjusted to prevent thermal expansion and thermal stress caused by rapid heating from damaging the atomizer, extending the service life of the atomizer and improving the overall performance of the atomizer.

In some embodiments of the present invention, the processor 110 is further configured to: during the cooling process at the end of atomization, determine the cooling rate of the atomizer based on the resonant frequency of the atomizer and the preset frequency temperature curve; When the cooling rate is greater than the second threshold, the frequency synthesis module 130 is controlled to generate a second excitation signal, where the power of the second excitation signal is less than the power of the first excitation signal.

In this embodiment, during the cooling process at the end of atomization, the above-mentioned processor 110 can also determine the cooling rate of the atomizer based on the determined resonant frequency of the atomizer and the pre-stored frequency temperature curve, and then determine the cooling rate of the atomizer. When the cooling rate is greater than the second threshold, the control frequency synthesis module 130 generates a second excitation signal, where the signal power of the second excitation signal is smaller than the signal power of the first excitation signal. In this way, the processor 110 can also be used to determine the cooling condition of the atomizer. If the cooling rate of the atomizer is too fast, the atomizer can be appropriately stimulated through a low-power excitation signal (ie, the second excitation signal), so that the atomizer It generates a certain amount of heat without causing atomization, thereby preventing the atomizer from cooling down too quickly and damaging the atomizer, extending the service life of the atomizer, and improving the overall performance of the atomizer.

The above-mentioned second threshold may be the same as the above-mentioned first threshold, that is, 5°C/s. During the cooling process of the atomizer, once the processor 110 detects that the cooling rate of the atomizer exceeds the above-mentioned threshold, It is believed that the cooling rate of the atomizer is too fast, and the atomizer is appropriately stimulated through a low-power excitation signal to generate a certain amount of heat, thereby slowing down the cooling rate of the atomizer.

The frequency modulation driving circuit provided by the present invention is described below through a specific embodiment.

In this embodiment, a frequency modulation drive circuit for a surface acoustic wave atomizer is proposed, including: a frequency tracking module, a power amplification module, a frequency synthesis module, a processor and a power supply module. Among them, the frequency tracking module is composed of a temperature sensor PT1000 and a bridge temperature detection circuit; the power amplification module is composed of a two-stage RF amplifier HMC580ST89, an adjustable RF attenuator MVA-2000+ that adjusts the amplification factor, and a first-stage RF power amplifier MRFE6VS25N; frequency The comprehensive module is composed of DDS frequency synthesizer AD9954; the processor is composed of microcontroller STM32H750; the power module is composed of linear voltage regulator LT1763.

When the atomizer starts working, the temperature of the atomizer is first obtained through the temperature sensor PT1000, and then the current resonant frequency of the atomizer is determined based on the pre-measured atomizer frequency temperature curve, and then the frequency synthesizer AD9954 is used to generate the resonance frequency. frequency excitation signal. Finally, the amplifiers HMC580ST89 and MRFE6VS25N of the power amplifier module amplify the excitation signal to an appropriate level and output a driving signal to drive the atomizer.

During the operation of the atomizer, the frequency modulation drive circuit will continue to repeat the above process, determine the current resonant frequency of the atomizer at any time through the temperature sensor PT1000, and adjust the output drive signal frequency in time to ensure the effectiveness of the output drive signal.

In addition, the temperature sensor PT1000 is also used to detect the temperature rise and fall of the atomizer. When the temperature rises too fast, the microcontroller STM32H750 controls the adjustable RF attenuator MVA-2000+ to reduce the output power of the drive signal, thereby slowing down the heating process; when the temperature rises too fast, At fast speed, the microcontroller STM32H750 controls the frequency synthesizer AD9954 to generate a low-power excitation signal to generate a certain amount of heat without causing atomization, thereby slowing down the cooling process.

An embodiment of the second aspect of the present invention provides a frequency modulation driving method, which is used in the frequency modulation driving circuit in any embodiment of the first aspect. In some embodiments of the present invention, as shown in Figure 4, a frequency modulation driving method is proposed, including:

Step S402, obtain the working parameters of the atomizer;

Step S404, determine the resonant frequency of the atomizer according to the operating parameters;

Step S406, synchronously generate a first excitation signal whose signal frequency is the resonant frequency;

Step S408: Adjust the first excitation signal to a drive signal of a target level, and output the drive signal.

The frequency modulation driving method proposed in the embodiment of the present invention is implemented by the frequency modulation driving circuit in any of the above embodiments, wherein the above frequency modulation driving circuit can be connected to the atomizer to provide a driving signal to the atomizer to drive the atomizer Work. Specifically, the above-mentioned atomizer is a surface acoustic wave atomizer. The particle size produced by the surface acoustic wave atomizer is inversely related to its vibration frequency. However, during the atomization process of the surface acoustic wave atomizer, the atomization The generated thermal effect changes the resonant frequency of the atomizer, thereby reducing the energy utilization of the atomizer and even damaging the service life of the atomizer.

Therefore, in the frequency modulation driving method provided by the present invention, the working parameters of the atomizer are obtained in real time through the frequency tracking module, and then the current resonant frequency of the atomizer is determined by the processor according to the above working parameters, and a control signal is generated to control The frequency synthesis module synchronously generates a first excitation signal whose signal frequency is the above-mentioned resonant frequency, that is, the frequency synthesis module is controlled to continuously output a sine wave signal whose signal frequency is the above-mentioned resonant frequency. On this basis, the generated first excitation signal is transmitted to the power amplification module, and the processor controls the power amplification module to adjust the signal amplitude of the first excitation signal according to the determined resonant frequency to adjust the first excitation signal to the target level. drive signal, and output the drive signal to the atomizer to drive the atomizer to perform atomization work. In this way, the frequency and amplitude of the output drive signal are synchronously adjusted according to the resonant frequency of the atomizer, so that the output drive signal adapts to the resonant frequency of the atomizer, thereby controlling the heating and cooling speed of the atomizer and reducing the impact of temperature changes on the atomizer. The influence of the atomizer's atomization ability improves the energy utilization and extends the service life of the atomizer.

Further, during the working process of the atomizer, the processor monitors the changes in the resonant frequency of the atomizer caused by the temperature rise during the atomization process through the frequency tracking module in real time, and adjusts the control signal according to the monitoring information fed back by the frequency tracking module. The frequency synthesis module is used to control the signal frequency of the output excitation signal, and the power amplification module is controlled to adjust the signal amplitude (or signal power) of the output driving signal. In this way, during the operation of the atomizer, the driving signal of the atomizer adapts synchronously to the resonant frequency of the atomizer, reducing the temperature rise and fall speed of the atomizer, thereby reducing the impact of temperature changes on the atomization ability of the atomizer. , improves energy utilization and extends the service life of the atomizer.

Therefore, the frequency modulation driving method provided by the present invention determines the resonant frequency of the atomizer when it is working according to the working parameters of the atomizer, and then synchronously adjusts the frequency and amplitude (power) of the output driving signal according to the changes in the resonant frequency. The drive signal of the atomizer is adapted to the resonant frequency of the atomizer, which reduces the heating and cooling speed of the atomizer, thus reducing the impact of the thermal effect generated by atomization on the atomization ability of the atomizer and improving the energy utilization rate. , extending the service life of the atomizer.

In addition, the frequency modulation driving method provided by the present invention is realized by the frequency modulation driving circuit in any technical solution of the first aspect. Therefore, the frequency modulation driving method provided by the present invention has the frequency modulation driving circuit in any technical solution of the first aspect. All the beneficial effects will not be repeated here.

In this embodiment, preferably, the above-mentioned determination of the resonant frequency of the atomizer based on the working parameters may specifically include: detecting the echo power of the reflected signal of the atomizer; determining the target frequency when the echo power is minimum through frequency sweep processing. point; determine the frequency corresponding to the target frequency point as the resonant frequency.

In this embodiment, preferably, the above-mentioned determination of the resonant frequency of the atomizer based on the working parameters may also include: detecting the working temperature of the atomizer to obtain a detected temperature value; determining based on the detected temperature value and the preset frequency temperature curve Resonant frequency.

In this embodiment, preferably, the above-mentioned determination of the resonant frequency of the atomizer based on the operating parameters may further include: obtaining the echo power and detected temperature value; determining the target frequency interval based on the detected temperature value and the preset frequency temperature curve; Through frequency sweep processing, the frequency corresponding to the frequency point with the smallest echo power in the target frequency range is determined to be the resonant frequency.

In this embodiment, preferably, the frequency modulation driving method also includes: during the atomization heating process, determining the heating rate of the atomizer according to the resonant frequency of the atomizer and the preset frequency temperature curve; based on the heating rate being greater than the first threshold , reduce the driving signal output power.

In this embodiment, preferably, the above-mentioned reducing the output power of the driving signal specifically includes: reducing the signal power of the first excitation signal to reduce the output power of the driving signal; or adjusting the output duty cycle of the first excitation signal to reduce the output power of the driving signal. The output power of the drive signal.

In this embodiment, preferably, the frequency modulation driving method further includes: during the cooling process at the end of atomization, determining the cooling rate of the atomizer according to the resonant frequency of the atomizer and the preset frequency temperature curve; Two thresholds are used to generate a second excitation signal, where the power of the second excitation signal is smaller than the power of the first excitation signal.

An embodiment of a third aspect of the invention provides a driving device. In some embodiments of the present invention, as shown in FIG. 5 , a driving device 500 is provided, including the frequency modulation driving circuit 100 in any embodiment of the first aspect. Therefore, the driving device 500 provided by the embodiment of the present invention has all the beneficial effects of the frequency modulation driving circuit 100 in any embodiment of the first aspect, which will not be described again here.

In the description of the present invention, the term "plurality" refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on that shown in the drawings. The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention; The terms "connection", "installation", "fixing", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or through an intermediate connection. Media are indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the description of the present invention, the terms "one embodiment," "some embodiments," "specific embodiments," etc., mean that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in the present invention. in at least one embodiment or example. In the present invention, schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (6)

1. A frequency modulation drive circuit, wherein the frequency modulation drive circuit is connectable to an atomizer, the frequency modulation drive circuit comprising:

a processor;

the frequency tracking module is used for acquiring the working parameters of the atomizer, the first end of the frequency tracking module is connected with the processor, and the processor determines the resonant frequency of the atomizer according to the working parameters;

the first end of the frequency synthesis module is connected with the processor, and the processor controls the frequency synthesis module to synchronously generate a first excitation signal with the signal frequency of the resonance frequency;

the input end of the power amplification module is connected with the second end of the frequency synthesis module, the output end of the power amplification module is connected with the atomizer, and the power amplification module is used for adjusting the first excitation signal into a driving signal of a target level and outputting the driving signal;

The processor is further configured to:

in the atomization heating process, determining the heating rate of the atomizer according to the resonant frequency of the atomizer and a preset frequency temperature curve;

reducing the drive signal output power based on the ramp rate being greater than a first threshold;

in the cooling process of the atomization end, determining the cooling rate of the atomizer according to the resonant frequency of the atomizer and a preset frequency temperature curve;

controlling the frequency synthesis module to generate a second excitation signal based on the cooling rate being greater than a second threshold, wherein the power of the second excitation signal is less than the power of the first excitation signal, and the second threshold is the same as the first threshold;

the frequency tracking module comprises:

a first frequency detection module, and/or a second frequency detection module; wherein,

the first frequency detection module includes:

the circulator or the directional coupler is connected with the atomizer and used for directional transmission of the driving signal and the reflection signal of the atomizer;

the input end of the power detection circuit is connected with the circulator or the directional coupler, the output end of the power detection circuit is connected with the processor, and the power detection circuit is used for detecting the echo power of the reflected signal and sending the echo power to the processor;

The second frequency detection module includes:

the temperature detection element is connected with the atomizer and is used for detecting the working temperature of the atomizer;

the temperature detection circuit is connected with the temperature detection element and is used for acquiring a detection temperature value of the temperature detection element and sending the detection temperature value to the processor;

in case the frequency tracking module comprises a first frequency detection module, the processor is specifically configured to:

receiving the echo power, and determining a target frequency point when the echo power is minimum through sweep frequency processing;

and determining the frequency corresponding to the target frequency point as the resonant frequency.

2. The frequency modulation drive circuit according to claim 1, wherein, in case the frequency tracking module comprises a second frequency detection module, the processor is specifically configured to:

receiving the detected temperature value;

and determining the resonant frequency according to the detected temperature value and a preset frequency temperature curve.

3. The frequency modulation drive circuit of claim 1, wherein, in the case where the frequency tracking module comprises a first frequency detection module and a second power detection module, the processor is configured to:

Receiving the echo power and the detected temperature value;

determining a target frequency interval according to the detected temperature value and a preset frequency temperature curve;

and determining the frequency corresponding to the frequency point with the minimum echo power in the target frequency interval as the resonant frequency through frequency sweep processing.

4. The frequency modulation drive circuit according to claim 1, wherein,

the power amplification module comprises a radio frequency attenuator, the radio frequency attenuator is connected with the processor, and the processor is specifically used for:

controlling the radio frequency attenuator to reduce the signal power of the first excitation signal so as to reduce the output power of the driving signal; or alternatively

And controlling the frequency synthesis module to adjust the output duty ratio of the first excitation signal so as to reduce the output power of the driving signal.

5. A frequency modulation driving method is characterized in that, a frequency modulation driving circuit as claimed in any one of claims 1 to 4, the frequency modulation driving method comprising:

acquiring working parameters of an atomizer;

determining the resonant frequency of the atomizer according to the working parameters;

the frequency of the synchronous generation signal is the same as that of the synchronous generation signal a first excitation signal at a resonant frequency;

And adjusting the first excitation signal to a driving signal of a target level, and outputting the driving signal.

6. A driving device for a vehicle, which comprises a driving device, characterized by comprising the following steps:

a frequency modulation drive circuit as claimed in any one of claims 1 to 4.