Control system and control method of piezoelectric ceramic driving power supply and driving power supply

Abstract

The invention discloses a control system and a control method of a piezoelectric ceramic driving power supply and the driving power supply, and relates to the technical field of driving power supply control. Comprising the following steps: collecting characteristic data of an input driving signal, and representing an output voltage based on the data; then, operating characteristic parameters of the piezoelectric ceramic material are collected, and the output delay time is calculated by combining the rising time and the falling time of the driving voltage; the working resonant frequency is calculated based on the material parameters, and the input frequency is adjusted in real time to adapt to external load changes. And based on the adjustment frequency, the time advance and the working environment temperature, correcting the input phase to obtain a control phase, and replacing the phase of the original input driving signal with the control phase. And designing a filter transfer function based on frequency adjustment, and filtering the output voltage so as to obtain an accurate output voltage signal. And the control precision and the response speed of the piezoelectric ceramic driving power supply are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of driving power supply control, and in particular to a control system, a control method and a driving power supply of a piezoelectric ceramic driving power supply. Background Art

[0002] With the continuous advancement of science and technology, piezoelectric ceramic materials are widely used in acoustic wave sensors, actuators, micro-mechanical systems, medical devices, robots and other fields due to their unique electrical and mechanical properties. The working principle of piezoelectric ceramics is based on the conversion between stress and voltage, that is, generating electrical signals under the action of external forces, or generating mechanical deformation under the application of electric fields. Therefore, controlling the driving power supply of piezoelectric ceramics to achieve precise output voltage and response characteristics is crucial to the performance and reliability of its application.

[0003] However, most of the current control methods for piezoelectric ceramic drive power supplies have some technical problems, mainly manifested in slow dynamic response, insufficient frequency matching accuracy, and poor adaptability to changes in the external environment. For example, traditional control systems often rely on fixed input frequency and phase, which makes it impossible for the system to adapt in time once the load changes or the working environment changes in actual applications, resulting in increased output voltage fluctuations and even overload or failure. In addition, the characteristics of piezoelectric ceramic materials are affected by many factors, including dielectric constant, elastic modulus, external load mass and external force. Changes in these parameters will directly affect the resonant frequency, resulting in a response lag in the control system. This hysteresis effect is particularly significant in high-frequency applications, which may cause system instability and performance degradation.

[0004] Therefore, how to effectively collect and analyze the characteristic data of the driving signal and the operating characteristic parameters of the piezoelectric ceramic material to achieve precise control of the output voltage has become a difficult problem that needs to be solved in current technology. Traditional methods often fail to fully utilize the material parameters and input signal characteristics of piezoelectric ceramics, lack a real-time adjustment mechanism for the dynamic response of the system, and result in low control accuracy and efficiency.

[0005] In the prior art, publication number C118573047A discloses a high-power closed-loop piezoelectric ceramic driving power supply and a control method thereof, including a processor, the input end of the processor is connected to a signal input end and a power input end, the output end of the processor is connected to a plurality of parallel units, the plurality of parallel units are all connected to the power input end, the output end of the plurality of parallel units is connected to a filter, the output end of the filter is connected to a power output end, and the power output end is connected to the processor through a feedback circuit. However, in this scheme, in step S301, the scheme requires calibration of the delay time. However, the calibration of the delay time often depends on the dynamic characteristics and working conditions of the system. If the working environment changes (such as temperature, load changes, etc.), the original delay time calibration may no longer be applicable, thereby affecting the control accuracy. In addition, the power output end is connected to the processor through a feedback circuit. Although this feedback mechanism can improve the system stability in theory, in actual circuit design, the complexity of the feedback circuit may cause additional delays and noise, affecting the overall response speed and stability of the system, especially when the load changes.

[0006] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0007] The object of the present invention is to provide a control system, a control method and a driving power supply of a piezoelectric ceramic driving power supply to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The control system of the piezoelectric ceramic drive power supply includes:

[0010] A main control unit module, used to collect input drive signal characteristic data of the piezoelectric ceramic drive power supply, and characterize the output voltage of the piezoelectric ceramic drive power supply based on the collected input drive signal characteristic data, wherein the input drive signal characteristic data includes a peak voltage, an input frequency, and an input phase of the input drive signal;

[0011] A delay time correction module is used to collect the operating characteristic parameters of the piezoelectric ceramic material of the piezoelectric ceramic driving power supply, and calculate the time advance of the piezoelectric ceramic driving power supply in combination with the operating characteristic parameters and the rise and fall time of the driving voltage. The operating characteristic parameters of the piezoelectric ceramic material include dielectric constant, elastic modulus, external load mass and external force;

[0012] The working frequency correction module is used to calculate the resonant frequency of the piezoelectric ceramic driving power supply based on the material parameters, obtain the working resonant frequency of the piezoelectric ceramic driving power supply, and adjust the input frequency in real time based on the working resonant frequency and the external load change to obtain the adjusted frequency:

[0013] A phase modulation control module is used to correct the input phase based on the adjustment frequency and output delay time in combination with the working environment temperature of the piezoelectric ceramic drive power supply to obtain a control phase, and use the control phase to replace the input phase of the input drive signal to obtain an output voltage;

[0014] The electromagnetic interference filtering module is used to design the transfer function of the filter based on the adjustment frequency, and filter the output voltage through the designed filter to obtain an accurate output voltage signal.

[0015] Furthermore, based on the collected input drive signal characteristic data, the output voltage of the piezoelectric ceramic drive power supply is characterized, wherein the specific expression of the output voltage is:

[0016]

[0017] Where V out (t) is the output voltage at time t, A in is the peak voltage of the input drive signal, f in is the input frequency, is the input phase at time t.

[0018] Furthermore, based on the operating characteristic parameters and in combination with the rise and fall time of the driving signal, the output delay time of the piezoelectric ceramic driving power supply is calculated, wherein the formula for calculating the output delay time is:

[0019]

[0020] Where, T d is the output delay time, t start is the time for the driving voltage of the piezoelectric ceramic driving power supply to rise from 0 to the set voltage under the control of the input driving signal, t0 is the time required for the driving voltage of the piezoelectric ceramic driving power supply to drop from the set voltage to 0 under the control of the input driving signal, ∈ is the dielectric constant, E is the elastic modulus of the piezoelectric ceramic, m is the external load mass, and F is the external force;

[0021] Based on the output delay time, the required time advance is calculated, wherein the required time advance is calculated based on the formula:

[0022] T a =T d +ΔT

[0023] Where, T ais the time advance, and ΔT is the expected response time.

[0024] Furthermore, the working resonant frequency of the piezoelectric ceramic driving power supply is calculated based on the material parameters, wherein the formula for calculating the working resonant frequency is:

[0025]

[0026] In the formula, f r is the working resonant frequency, H is the thickness of the piezoelectric ceramic, E is the elastic modulus of the piezoelectric ceramic, and ρ is the density of the ceramic:

[0027] Based on the working resonant frequency combined with the real-time input frequency of the external load change, the adjustment frequency is obtained, wherein the formula for calculating the adjustment frequency is:

[0028] f adj =f r (1+Δf)

[0029] In the formula, f adj To adjust the frequency, Δf is the frequency offset based on the load change, wherein the frequency offset Δf based on the load change is calculated based on the formula:

[0030]

[0031] Where k1 is the proportional constant, m is the external load mass, and B is the effective area of ​​the piezoelectric ceramic.

[0032] Furthermore, based on the adjustment frequency and the output delay time, the input phase is corrected in combination with the working environment temperature of the piezoelectric ceramic driving power supply to obtain the control phase, wherein the formula for correcting the input phase is:

[0033]

[0034] In the formula, is the control phase at time t, T a is the time advance, y(W) is the temperature correction function, which is specifically expressed as:

[0035] y(W)=k2(W S -W0)

[0036] Where k2 is the temperature linear coefficient, W S is the real-time ambient temperature, and W0 is the reference temperature.

[0037] Furthermore, the logic for designing the transfer function of the filter based on the adjustment frequency is: the corresponding angular frequency is calculated based on the adjustment frequency, and the formula for calculating the angular frequency is:

[0038] ωd =2π*f adj

[0039] In the formula, ω d is the angular frequency;

[0040] Based on the obtained angular frequency ω d , design the transfer function of the filter, where the designed filter is a second-order low-pass filter, and the transfer function of the filter is specifically expressed as:

[0041]

[0042] Where G(s) is the filter transfer function, Q is the quality factor, and s is the Laplace transform variable, which represents the complex frequency in the frequency domain. The specific formula is:

[0043] s=σ+jω d

[0044] Where σ is the attenuation rate and j is the imaginary unit.

[0045] The present invention also provides a method for controlling a piezoelectric ceramic driving power supply, wherein the method for controlling a piezoelectric ceramic driving power supply is used to control the control system of the piezoelectric ceramic driving power supply, and the specific steps include:

[0046] Collecting input drive signal characteristic data of the piezoelectric ceramic drive power supply, and characterizing the output voltage of the piezoelectric ceramic drive power supply based on the collected input drive signal characteristic data, wherein the input drive signal characteristic data includes a peak voltage, an input frequency, and an input phase of the input drive signal;

[0047] Collecting the operating characteristic parameters of the piezoelectric ceramic material of the piezoelectric ceramic driving power supply, and calculating the time advance of the piezoelectric ceramic driving power supply in combination with the operating characteristic parameters and the rise and fall time of the driving voltage, wherein the operating characteristic parameters of the piezoelectric ceramic material include dielectric constant, elastic modulus, external load mass and external force;

[0048] The resonant frequency of the piezoelectric ceramic driving power supply is calculated based on the material parameters to obtain the working resonant frequency of the piezoelectric ceramic driving power supply. The input frequency is adjusted in real time based on the working resonant frequency and the change of the external load to obtain the adjustment frequency.

[0049] Based on the adjustment frequency and the time advance, the input phase is corrected in combination with the working environment temperature of the piezoelectric ceramic drive power supply to obtain the control phase, and the control phase is used to replace the input phase of the input drive signal to obtain the output voltage;

[0050] The transfer function of the filter is designed based on the adjustment frequency, and the output voltage is filtered through the designed filter to obtain an accurate output voltage signal.

[0051] The present invention also provides a driving power supply, comprising the above-mentioned piezoelectric ceramic driving power supply control system.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] First, by real-time acquisition of characteristic data such as the peak voltage, input frequency, and input phase of the input drive signal, as well as operating characteristic parameters such as the dielectric constant and elastic modulus of piezoelectric ceramics, the control system can fully understand the current working status and ensure the accuracy of control decisions.

[0054] Secondly, the resonant frequency is calculated based on the material parameters, so that the system can adjust the input frequency in real time when the external load changes, thereby effectively matching the resonant conditions, reducing energy loss and improving driving efficiency. By correcting the input phase and combining the influence of ambient temperature, the accuracy of the control phase is further improved, ensuring stability during high-frequency response. Finally, the designed filter transfer function optimizes the output voltage, effectively filters out unnecessary noise, and outputs a more accurate voltage signal, thereby improving the performance and reliability of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a schematic diagram of the overall system structure of the present invention;

[0056] Figure 2 It is a schematic diagram of the overall method flow of the present invention. DETAILED DESCRIPTION

[0057] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0058] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0059] Example:

[0060] See also Figure 1 , the present invention provides a system structure:

[0061] A control system for a piezoelectric ceramic driving power supply, specifically comprising:

[0062] A main control unit module, used to collect input drive signal characteristic data of the piezoelectric ceramic drive power supply, and characterize the output voltage of the piezoelectric ceramic drive power supply based on the collected input drive signal characteristic data, wherein the input drive signal characteristic data includes a peak voltage, an input frequency, and an input phase of the input drive signal;

[0063] In this architecture, the main control unit MCU uses a high-performance embedded processor that can quickly process sensor feedback information and adjust the output signal in real time.

[0064] Based on the collected input drive signal characteristic data, the output voltage of the piezoelectric ceramic drive power supply is characterized, where the specific expression of the output voltage is:

[0065]

[0066] Where V out (t) is the output voltage at time t, A in is the peak voltage of the input drive signal, f in is the input frequency, is the input phase at time t.

[0067] From the collected signal data, the maximum value (peak value) of the signal is identified, which is the peak voltage of the input drive signal. The collected data can be analyzed through data processing tools (such as MATLAB, Python, etc.) to calculate the maximum value.

[0068] By performing a fast Fourier transform (FFT) on the collected signal, the signal spectrum can be analyzed to find the main frequency components of the signal. The main frequency component extracted from the spectrum is the input frequency.

[0069] Using the acquired signal waveform, select a known reference point (for example, the zero crossing point or peak point of a sine wave). Record the position of this reference point at time t and compare it with the theoretical waveform to estimate the input phase by the time difference of the zero crossing point or peak point.

[0070] By collecting the peak voltage, input frequency and input phase of the driving signal, the characteristics of the input signal can be more accurately characterized. This precise data collection provides a reliable basis for the control of the output voltage, allowing the system to dynamically adjust according to the actual input signal conditions, thereby achieving precise control of the output voltage.

[0071] A delay time correction module is used to collect the operating characteristic parameters of the piezoelectric ceramic material of the piezoelectric ceramic driving power supply, and calculate the time advance of the piezoelectric ceramic driving power supply in combination with the operating characteristic parameters and the rise and fall time of the driving voltage. The operating characteristic parameters of the piezoelectric ceramic material include dielectric constant, elastic modulus, external load mass and external force;

[0072] Based on the operating characteristic parameters and combined with the rise and fall time of the drive signal, the output delay time of the piezoelectric ceramic drive power supply is calculated. The formula for calculating the output delay time is:

[0073]

[0074] Where, T d is the output delay time, t start is the time for the driving voltage of the piezoelectric ceramic driving power supply to rise from 0 to the set voltage under the control of the input driving signal, t0 is the time required for the driving voltage of the piezoelectric ceramic driving power supply to drop from the set voltage to 0 under the control of the input driving signal, ∈ is the dielectric constant, E is the elastic modulus of the piezoelectric ceramic, m is the external load mass, and F is the external force;

[0075] The set voltage is the standard voltage of the piezoelectric ceramic driving power supply, which is generally between 5V and 200V and can be obtained by referring to the material data manual.

[0076] m is the external load mass, specifically the load mass applied to the piezoelectric material. The larger the mass, the greater the inertia of the system, resulting in a delayed response time. F is the external force; it represents the force applied to the piezoelectric material. The larger the force, the faster the dynamic response of the material.

[0077] The external force F can usually come from the following sources: Mechanical load: This is the most direct external force, which may be applied by a mechanical system (such as an actuator, a robotic arm, or other load connected to the piezoelectric ceramic). Piezoelectric ceramics will produce displacement and strain under the action of mechanical load, which is also the basis of the piezoelectric effect. Electric field effect: When using piezoelectric materials, applying voltage will cause the electric field in the material to change, which in turn causes the polarization and deformation of the material. This deformation will induce a reaction force, especially when the piezoelectric ceramic is connected to an external structure, this force will affect the overall dynamic response.

[0078] The time t for the power supply output signal to rise from 0 to the set voltage is startThe specific acquisition method is as follows: First, make sure you have the right test equipment and tools, including an oscilloscope: used to observe the power supply output signal waveform in real time and measure the rise and fall time. Signal generator (if necessary): used to generate a standard input signal; power supply: piezoelectric ceramic drive power supply or other power supply to be tested. Load: connect an appropriate load to the power supply to simulate actual working conditions; on the oscilloscope, you can see the waveform of the input signal. Use cursors or measurement tools to mark the time points when the signal reaches 0 and the set voltage respectively. Calculate the time difference between the two time points, which is t start The method for obtaining the time t0 required for the set voltage to drop to 0 is similar.

[0079] These two delays together reflect the overall response time of the power supply during signal changes.

[0080] Dielectric constant ∈ The method for obtaining is: Static measurement method: Use a capacitance measuring instrument to directly measure the capacitance value of the piezoelectric ceramic, and then calculate the dielectric constant using the following formula:

[0081]

[0082] Where C is the equivalent capacitance, H is the thickness of the ceramic, and B is the effective area of ​​the piezoelectric ceramic.

[0083] In addition, the dielectric constant can be obtained by applying an AC voltage and measuring the current and voltage of the ceramic in combination with an impedance analyzer.

[0084] The elastic modulus of the material is obtained through compression / tensile testing, specifically: using a material testing machine to perform a tensile or compression test on the piezoelectric ceramic sample, and recording the stress-strain curve, from which the elastic modulus is calculated.

[0085] Based on the output delay time, the required time advance is calculated, wherein the required time advance is calculated based on the formula:

[0086] T a =T d +ΔT

[0087] Where, T a is the time advance, ΔT is the expected response time, which can be set according to actual needs.

[0088] By delaying the control of the power supply by t start and t0 and material properties This combined analysis helps to more accurately evaluate system performance during the design and optimization phases.

[0089] The working frequency correction module is used to calculate the resonant frequency of the piezoelectric ceramic driving power supply based on the material parameters, obtain the working resonant frequency of the piezoelectric ceramic driving power supply, and adjust the input frequency in real time based on the working resonant frequency and the external load change to obtain the adjusted frequency:

[0090] The working resonant frequency of the piezoelectric ceramic drive power supply is calculated based on the material parameters, where the formula for calculating the working resonant frequency is:

[0091]

[0092] In the formula, f r is the working resonant frequency, H is the thickness of the piezoelectric ceramic, E is the elastic modulus of the piezoelectric ceramic, and ρ is the density of the ceramic;

[0093] The thickness of the piezoelectric ceramic directly affects the resonant frequency. The greater the thickness, the lower the vibration mode of the material, resulting in a lower natural frequency. Therefore, there is a 2H term in the denominator, indicating that the thickness is inversely proportional to the resonant frequency.

[0094] The elastic modulus E reflects the material's ability to resist deformation. The larger the modulus, the less likely the material is to deform, resulting in an increase in the resonant frequency. Therefore, the elastic modulus is in the numerator and is proportional to the resonant frequency.

[0095] Density ρ affects the inertia of the material. The greater the density, the greater the mass of the material, resulting in a lower resonant frequency because more mass requires more energy to produce the same vibration frequency. Therefore, density is in the denominator, and there is an inverse relationship.

[0096] Based on the working resonant frequency combined with the real-time input frequency of the external load change, the adjustment frequency is obtained, wherein the formula for calculating the adjustment frequency is:

[0097] f adj =f r (1+Δf)

[0098] In the formula, f adj To adjust the frequency, Δf is the frequency offset based on the load change, wherein the frequency offset Δf based on the load change is calculated based on the formula:

[0099]

[0100] Where k1 is the proportional constant, m is the external load mass, and B is the effective area of ​​the piezoelectric ceramic.

[0101] Higher applied voltages enhance the piezoelectric effect, increasing the material's vibration frequency, so A inIt is in the numerator of the formula, indicating a positive correlation with the frequency shift. A larger load mass will result in a lower vibration frequency, so m is in the denominator of the formula, indicating an inverse correlation with the frequency shift. The elastic modulus E and effective area B are used to evaluate the stiffness characteristics of the material and reflect the overall response capability of the piezoelectric ceramic.

[0102] The proportional constant k1 is a set constant, generally 0.1 to 0.5, and the following factors need to be considered: Material properties: Different types of piezoelectric ceramics (such as PZT, PVDF, etc.) may have different proportional constants. Environmental conditions: Environmental factors such as temperature and humidity can affect the performance of materials. Device geometry: The geometry and connection method of the ceramic may affect its dynamic characteristics.

[0103] The phase modulation control module is used to correct the input phase based on the adjustment frequency and output delay time in combination with the working environment temperature of the piezoelectric ceramic driving power supply to obtain a control phase, and use the control phase to replace the input phase of the input driving signal to obtain the output voltage;

[0104] Based on the adjustment frequency and output delay time, the input phase is corrected in combination with the working environment temperature of the piezoelectric ceramic drive power supply to obtain the control phase, wherein the formula for correcting the input phase is:

[0105]

[0106] In the formula, is the control phase at time t, T a is the time advance, y(W) is the temperature correction function, which is specifically expressed as:

[0107] y(W)=k2(W S -W0)

[0108] Where k2 is the temperature linear coefficient, W S is the real-time ambient temperature, W0 is the reference temperature, which can be set according to the operating temperature range of the piezoelectric ceramic. The specific value can be 25 degrees Celsius and can be set according to actual conditions.

[0109] The temperature linear coefficient k2 usually involves experimental testing and material property analysis, and is generally between tens to hundreds of microradians per degree Celsius (μ rad / °C), depending on the composition and processing method of the piezoelectric ceramic material.

[0110] The change of frequency will lead to the change of phase. adj *T a To quantify this effect, subtract 2πf from the phase adjustment formula adj *T aIt is to compensate for the phase deviation caused by phase lag or time delay, and ensure that the phase can be adjusted in real time when the frequency changes to maintain the stability and response accuracy of the system. This item is combined with the dynamic characteristics of the system to reflect the direct impact of frequency changes on the phase. At different temperatures, the response time of piezoelectric materials may become faster or slower. This change will cause a deviation between the input phase and the desired phase of the control system, which in turn affects the stability and control accuracy of the system.

[0111] Phase modulation is a method of transmitting information and controlling output by changing the phase of a signal. In power electronics and drive power supplies, phase modulation usually involves adjusting the phase of the modulated signal to control the timing of application of the output voltage. In this way, the rise and fall times of the current, as well as the transient response, can be more flexibly controlled to optimize the performance of the system. Phase modulation can more accurately adjust the current waveform and reduce harmonic components, thereby reducing the pressure and loss on the power supply. Phase modulation allows more precise control of the timing of voltage application within each cycle. Compared with the fixed duty cycle of PWM, phase modulation can be dynamically adjusted according to system requirements. At the same time, phase modulation can automatically adjust the phase according to the real-time feedback of the system, so that the system can flexibly respond to different load characteristics and ensure stable output performance.

[0112] The properties of piezoelectric ceramics (such as elastic modulus, dielectric constant, etc.) are significantly affected by temperature, so changes in ambient temperature must be considered when controlling the phase.

[0113] The electromagnetic interference filtering module is used to design the transfer function of the filter based on the adjustment frequency, and filter the output voltage through the designed filter to obtain an accurate output voltage signal.

[0114] The logic for designing the transfer function of the filter based on the adjustment frequency is: calculate the corresponding angular frequency based on the adjustment frequency, and the formula for calculating the angular frequency is:

[0115] ω d =2π*f adj

[0116] In the formula, ω d is the angular frequency;

[0117] Based on the obtained angular frequency ω d , design the transfer function of the filter, where the designed filter is a second-order low-pass filter, and the transfer function of the filter is specifically expressed as:

[0118]

[0119] Where G(s) is the filter transfer function, Q is the quality factor, and s is the Laplace transform variable, which represents the complex frequency in the frequency domain. The specific formula is:

[0120] s=σ+jω d

[0121] Where σ is the attenuation rate and j is the imaginary unit.

[0122] In filter design, the quality factor Q is a very important parameter, which describes the frequency response characteristics of the filter. It is a dimensionless parameter, and its value is the ratio of the filter center frequency to the bandwidth.

[0123] Among them, a second-order low-pass filter is selected. The second-order filter can provide a smoother transition band and has a higher attenuation rate. Compared with the first-order filter, it can more effectively control high-frequency noise.

[0124] The numerator of the transfer function It means that the gain of the filter is related to the square of the cutoff frequency, which determines the gain of the filter in the low-frequency area. 2 represents the basic characteristics of a second-order system, ensuring that the filter is second-order, A term related to the quality factor Q that controls the bandwidth and peak gain of the filter. A large Q value means a narrow bandwidth and higher peak gain, which is suitable for applications with higher gain at lower frequencies. represents the term related to the cutoff frequency, ensuring that the system d The frequency of the

[0125] The piezoelectric ceramic driving power supply is controlled by controlling the phase and adjusting the frequency to output an ideal electrical signal.

[0126] See also Figure 2 The present invention also provides a method for controlling a piezoelectric ceramic driving power supply, wherein the method for controlling a piezoelectric ceramic driving power supply is used to control the control system of the piezoelectric ceramic driving power supply, and the specific steps include:

[0127] Step 1: Collecting input drive signal characteristic data of the piezoelectric ceramic drive power supply, and characterizing the output voltage of the piezoelectric ceramic drive power supply based on the collected input drive signal characteristic data, wherein the input drive signal characteristic data includes an input peak voltage, an input frequency, and an input phase of the drive signal;

[0128] Step 2: Collect the operating characteristic parameters of the piezoelectric ceramic material of the piezoelectric ceramic driving power supply, and calculate the time advance of the piezoelectric ceramic driving power supply by combining the operating characteristic parameters and the rise and fall time of the driving voltage. The operating characteristic parameters of the piezoelectric ceramic material include dielectric constant, elastic modulus, external load mass and external force;

[0129] Step 3: Calculate the resonant frequency of the piezoelectric ceramic driving power supply based on the material parameters to obtain the working resonant frequency of the piezoelectric ceramic driving power supply, and adjust the input frequency in real time based on the working resonant frequency and the external load change to obtain the adjustment frequency;

[0130] Step 4: Based on the adjustment frequency and time advance, the input phase is corrected in combination with the working environment temperature of the piezoelectric ceramic drive power supply to obtain the control phase, and the control phase is used to replace the input phase of the input drive signal to obtain the output voltage:

[0131] Step 5: Design a transfer function of the filter based on the adjustment frequency, filter the output voltage through the designed filter, and obtain an accurate output voltage signal.

[0132] The present invention also provides a driving power supply, comprising the above-mentioned piezoelectric ceramic driving power supply control system.

[0133] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0134] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented by software, the above embodiments may be implemented in whole or in part in the form of a computer program product. Those skilled in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software methods depends on the specific application and design constraints of the technical solution.

[0135] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0136] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A control system for a piezoelectric ceramic driving power supply, characterized in that: Specifically include: A main control unit module, used to collect input drive signal characteristic data of the piezoelectric ceramic drive power supply, and characterize the output voltage of the piezoelectric ceramic drive power supply based on the collected input drive signal characteristic data, wherein the input drive signal characteristic data includes a peak voltage, an input frequency, and an input phase of the input drive signal; A delay time correction module is used to collect the operating characteristic parameters of the piezoelectric ceramic material of the piezoelectric ceramic driving power supply, and calculate the time advance of the piezoelectric ceramic driving power supply in combination with the operating characteristic parameters and the rise and fall time of the driving voltage. The operating characteristic parameters of the piezoelectric ceramic material include dielectric constant, elastic modulus, external load mass and external force; The working frequency correction module is used to calculate the resonant frequency of the piezoelectric ceramic driving power supply based on the material parameters, obtain the working resonant frequency of the piezoelectric ceramic driving power supply, and adjust the input frequency in real time by combining the working resonant frequency with the external load change to obtain the adjusted frequency; The phase modulation control module is used to correct the input phase based on the adjustment frequency and the time advance amount in combination with the working environment temperature of the piezoelectric ceramic drive power supply to obtain a control phase, and use the control phase to replace the input phase of the input drive signal to obtain an output voltage; The electromagnetic interference filtering module is used to design the transfer function of the filter based on the adjustment frequency, and filter the output voltage through the designed filter to obtain an accurate output voltage signal.

2. The control system of a piezoelectric ceramic driving power supply according to claim 1, characterized in that: Based on the collected input drive signal characteristic data, the output voltage of the piezoelectric ceramic drive power supply is characterized, where the specific expression of the output voltage is: Where V iut (t) is the output voltage at time t, A in is the peak voltage of the input drive signal, f in is the input frequency, is the input phase at time t.

3. The control system of a piezoelectric ceramic driving power supply according to claim 2, characterized in that: Based on the operating characteristic parameters and combined with the rise and fall time of the drive signal, the output delay time of the piezoelectric ceramic drive power supply is calculated. The formula for calculating the output delay time is: Where, T d is the output delay time, t start is the time for the driving voltage of the piezoelectric ceramic driving power supply to rise from 0 to the set voltage under the control of the input driving signal, t0 is the time required for the driving voltage of the piezoelectric ceramic driving power supply to drop from the set voltage to 0 under the control of the input driving signal, ∈ is the dielectric constant, E is the elastic modulus of the piezoelectric ceramic, m is the external load mass, and F is the external force; Based on the output delay time, the required time advance is calculated, wherein the required time advance is calculated based on the formula: T a =T d +ΔT Where, T a is the time advance, and ΔT is the expected response time.

4. The control system of a piezoelectric ceramic driving power supply according to claim 2, characterized in that: The working resonant frequency of the piezoelectric ceramic drive power supply is calculated based on the material parameters, where the formula for calculating the working resonant frequency is: In the formula, f r is the working resonant frequency, H is the thickness of the piezoelectric ceramic, E is the elastic modulus of the piezoelectric ceramic, and ρ is the density of the ceramic; Based on the working resonant frequency combined with the real-time input frequency of the external load change, the adjustment frequency is obtained, wherein the formula for calculating the adjustment frequency is: f adj =f r (1+Δf) In the formula, f adj To adjust the frequency, Δf is the frequency offset based on the load change, wherein the frequency offset Δf based on the load change is calculated based on the formula: Where k1 is the proportional constant, m is the external load mass, and B is the effective area of ​​the piezoelectric ceramic.

5. A control system for a piezoelectric ceramic driving power supply according to claim 4, characterized in that: Based on the adjustment frequency and time advance, the input phase is corrected in combination with the working environment temperature of the piezoelectric ceramic drive power supply to obtain the control phase, wherein the formula for correcting the input phase is: In the formula, is the control phase at time t, T a is the time advance, y(W) is the temperature correction function, which is specifically expressed as: y(W)=k2(W S -W0) Where k2 is the temperature linear coefficient, W S is the real-time ambient temperature, and W0 is the reference temperature.

6. The control system of a piezoelectric ceramic driving power supply according to claim 1, characterized in that: The logic for designing the transfer function of the filter based on the adjustment frequency is: calculate the corresponding angular frequency based on the adjustment frequency, and the formula for calculating the angular frequency is: oh d =2π*f adj In the formula, ω d is the angular frequency; Based on the obtained angular frequency ω d , design the transfer function of the filter, where the designed filter is a second-order low-pass filter, and the transfer function of the filter is specifically expressed as: Where G(s) is the filter transfer function, Q is the quality factor, and s is the Laplace transform variable, which represents the complex frequency in the frequency domain. The specific formula is: s=σ+jω d Where σ is the attenuation rate and j is the imaginary unit.

7. A method for controlling a piezoelectric ceramic driving power supply, characterized in that: The control method of the piezoelectric ceramic driving power supply is used to control the control system of the piezoelectric ceramic driving power supply according to any one of claims 1 to 6, and the specific steps include: Collecting input drive signal characteristic data of the piezoelectric ceramic drive power supply, and characterizing the output voltage of the piezoelectric ceramic drive power supply based on the collected input drive signal characteristic data, wherein the input drive signal characteristic data includes a peak voltage, an input frequency, and an input phase of the input drive signal; Collecting the operating characteristic parameters of the piezoelectric ceramic material of the piezoelectric ceramic driving power supply, and calculating the time advance of the piezoelectric ceramic driving power supply in combination with the operating characteristic parameters and the rise and fall time of the driving voltage, wherein the operating characteristic parameters of the piezoelectric ceramic material include dielectric constant, elastic modulus, external load mass and external force; The resonant frequency of the piezoelectric ceramic driving power supply is calculated based on the material parameters to obtain the working resonant frequency of the piezoelectric ceramic driving power supply. The input frequency is adjusted in real time based on the working resonant frequency and the change of the external load to obtain the adjustment frequency. Based on the adjustment frequency and the time advance, the input phase is corrected in combination with the working environment temperature of the piezoelectric ceramic drive power supply to obtain the control phase, and the control phase is used to replace the input phase of the input drive signal to obtain the output voltage; The transfer function of the filter is designed based on the adjustment frequency, and the output voltage is filtered through the designed filter to obtain an accurate output voltage signal.

8. A driving power supply, characterized in that: Comprising the control module according to any one of claims 1 to 6.

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