Resonator control system based on digital phase-locked amplification and control method thereof

Abstract

The invention discloses a resonator control system based on digital phase-locked amplification and a control method thereof. The system comprises a resonator, a front-end conditioning module, a signal processing module, a driving signal generation module, a communication interface and a control software module. The method comprises the following steps: performing resonance processing according to an excitation signal to obtain an output response signal of a resonator; performing data preprocessing on the output response signal of the resonator to obtain a digital signal of the output response; generating a phase error value and an amplitude error value, and carrying out dynamic adjustment processing on the digital signal of the output response to obtain a corrected output digital signal; and performing signal preprocessing on the corrected output digital signal, and outputting a sine and cosine analog signal to control the resonator to be in a resonant state. According to the embodiment of the invention, accurate frequency locking and gain adjustment can be realized at the same time, the control coefficient can be correspondingly adjusted according to the input target response speed, and the flexibility of the system is improved. The method can be widely applied to the technical field of micro electro mechanical systems.

Description

Technical Field

[0001] The present application relates to the field of micro-electromechanical technology, and in particular to a resonator control system based on digital phase-locked amplification and a control method thereof. Background Art

[0002] A resonator is a typical structure in MEMS devices, capable of stable vibration at a specific frequency. It features high sensitivity, low energy loss, and excellent frequency selectivity. Resonators play a significant role in our daily lives and are widely used in wearable devices and other fields.

[0003] The resonator has multiple resonant frequencies. According to the resonance principle, an excitation signal with the same frequency as the resonant frequency needs to be applied to the resonator to ensure the normal operation of the resonator. Ideally, the resonant frequency of the resonator should be fixed. However, due to the influence of external non-ideal factors, the resonant frequency of the resonator will drift to a certain extent. If the driving signal frequency cannot be synchronized with the change of the natural resonant frequency of the resonator, the system accuracy will be affected. Therefore, the feedback control link is indispensable in the resonator. However, the analog open-loop control method of the related art is not only of low accuracy, but also cannot guarantee the stability of the system. For example, a dual-mode MEMS resonator drive circuit in the related art uses closed-loop feedback to control the amplitude and lock the frequency of the resonator, thereby ensuring the working stability of the resonator in the resonant state. Its drive circuit uses an analog loop, but the performance of the analog loop is easily affected by external interference, and the system accuracy will still be affected by non-ideal factors.

[0004] In summary, the technical problems existing in the relevant technologies need to be improved. Summary of the Invention

[0005] The main purpose of the embodiments of the present application is to propose a resonator control system based on digital phase-locked amplification and a control method thereof, which can achieve precise frequency locking and gain adjustment while ensuring fast response, and can make corresponding adjustments to the control coefficient according to the input target response speed, thereby improving the flexibility of the system.

[0006] To achieve the above-mentioned purpose, one aspect of an embodiment of the present application proposes a resonator control system based on digital phase-locked amplification, the system comprising a resonator, a front-end conditioning module, a signal processing module, a drive signal generation module, a communication interface and a control software module, wherein the output end of the front-end conditioning module is connected to the input end of the signal processing module, the first output end of the signal processing module is connected to the input end of the drive signal generation module, the output end of the drive signal generation module is connected to the input end of the resonator, the output end of the resonator is connected to the input end of the front-end conditioning module, the second output end of the signal processing module is connected to the input end of the communication interface, and the communication interface is connected to the control software module, wherein:

[0007] The resonator is used to perform resonance processing according to the excitation signal to obtain an output response signal of the resonator;

[0008] The front-end conditioning module is used to perform data preprocessing on the output response signal of the resonator to obtain an output response digital signal;

[0009] The signal processing module is used to generate a phase error value and an amplitude error value to dynamically adjust the output response digital signal to obtain a corrected output digital signal;

[0010] The driving signal generating module is used to perform signal preprocessing on the corrected output digital signal and output a sine and cosine analog signal to control the resonator to be in a resonant state;

[0011] The communication interface is used to control signal transmission between the signal processing module and the control software module;

[0012] The control software module is used to display characteristic information and waveform of the output signal of the resonator.

[0013] In some embodiments, the front-end conditioning module includes a first amplifier, a first filter, and an analog-to-digital converter, wherein the output of the first amplifier is connected to the input of the first filter, and the output of the first filter is connected to the input of the analog-to-digital converter, wherein:

[0014] The first amplifier is used to amplify the output response signal of the resonator to obtain an amplified output response signal;

[0015] The first filter is used to filter the amplified output response signal to obtain a filtered output response signal;

[0016] The analog-to-digital converter is used to perform analog-to-digital conversion processing on the filtered output response signal to obtain a digital signal of the output response.

[0017] In some embodiments, the signal processing module includes a demodulator, a phase-locked loop, and a direct digital frequency synthesis signal generator, wherein the output of the demodulator and the output of the phase-locked loop are respectively connected to the input of the direct digital frequency synthesis signal generator, and the output of the direct digital frequency synthesis signal generator is feedback-connected to the input of the demodulator, wherein:

[0018] The demodulator is used to demodulate the output response digital signal to obtain the actual amplitude and actual phase of the output response digital signal;

[0019] Calculating the difference between the actual amplitude and the actual phase and the target value respectively to obtain a phase error value and an amplitude error value;

[0020] The phase-locked loop is used to perform frequency locking processing on the output response digital signal to obtain the actual frequency of the output response digital signal;

[0021] The direct digital frequency synthesis signal generator is used to generate a sine signal and a cosine signal of the same frequency according to the actual frequency of the output response digital signal, and is used for the demodulator to calculate the actual amplitude and actual phase of the output response digital signal, and dynamically adjust the output response digital signal according to the phase error value and the amplitude error value to obtain a corrected output digital signal.

[0022] In some embodiments, the direct digital frequency synthesis signal generator includes a first DDS module, a second DDS module, and a third DDS module, wherein:

[0023] The first DDS module is used to generate a cosine reference signal with the same frequency according to the actual frequency of the output response digital signal to control the demodulation operation of the demodulator;

[0024] The second DDS module is used to generate a sinusoidal reference signal with the same frequency as the actual frequency of the output response digital signal to control the demodulation operation of the demodulator;

[0025] The third DDS module is used to dynamically adjust the output response digital signal according to the phase error value and the amplitude error value to obtain a corrected output digital signal.

[0026] In some embodiments, the drive signal generation module includes a digital-to-analog converter, a second amplifier, and a second filter, wherein the output of the digital-to-analog converter is connected to the input of the second amplifier, and the output of the second amplifier is connected to the input of the second filter, wherein:

[0027] The digital-to-analog converter is used to perform digital-to-analog conversion on the corrected output digital signal to obtain a converted output analog signal;

[0028] The second amplifier is used to amplify the converted output analog signal to obtain an amplified output analog signal;

[0029] The second filter is used to filter the amplified output analog signal and output a sine and cosine analog signal to control the resonator to be in a resonant state.

[0030] To achieve the above object, another aspect of the present invention provides a resonator control method based on digital phase-locked amplification, the method comprising the following steps:

[0031] Perform resonance processing according to the excitation signal to obtain an output response signal of the resonator;

[0032] performing data preprocessing on the output response signal of the resonator to obtain an output response digital signal;

[0033] Generating a phase error value and an amplitude error value to dynamically adjust the output response digital signal to obtain a corrected output digital signal;

[0034] The corrected output digital signal is subjected to signal preprocessing, and a sine-cosine analog signal is output to control the resonator to be in a resonant state.

[0035] In some embodiments, performing data preprocessing on the output response signal of the resonator to obtain a digital signal of the output response includes:

[0036] amplifying the output response signal of the resonator to obtain an amplified output response signal;

[0037] performing filtering processing on the amplified output response signal to obtain a filtered output response signal;

[0038] Performing analog-to-digital conversion on the filtered output response signal to obtain a digital signal of the output response.

[0039] In some embodiments, generating a phase error value and an amplitude error value to dynamically adjust the output response digital signal to obtain a corrected output digital signal includes:

[0040] determining an actual frequency of the digital signal of the output response;

[0041] generating a sine reference signal having the same frequency and a cosine reference signal having the same frequency according to the actual frequency;

[0042] Demodulating the digital signal of the output response according to the sine reference signal and the cosine reference signal to obtain an actual amplitude and an actual phase;

[0043] Calculating the difference between the actual amplitude and the actual phase and the target amplitude and the target phase respectively to obtain an error value;

[0044] Dynamically adjust the output response digital signal according to the error value to obtain the corrected output digital signal.

[0045] In some embodiments, the expression of the feedback control signal is specifically as follows:

[0046]

[0047] In the above formula, u θ (t) represents the phase feedback control signal, u G (t) represents the amplitude feedback control signal, θ represents the phase value of the output response signal, e θ (t) represents the phase error value, e G (t) represents the amplitude error value, F p Indicates the proportional gain, F i Indicates the integral gain, F d Denotes the differential gain, F f represents the feedforward gain, f θ (t) represents the feedforward signal, G p Represents the proportional gain, G i Indicates the integral gain, G d Denotes the differential gain, G f represents the feedforward gain, f G (t) represents the feedforward signal.

[0048] In some embodiments, the performing signal preprocessing on the corrected output digital signal and outputting a sine and cosine analog signal to control the resonator to be in a resonant state includes:

[0049] Performing digital-to-analog conversion on the corrected output digital signal to obtain a converted output analog signal;

[0050] amplifying the converted output analog signal to obtain an amplified output analog signal;

[0051] The amplified output analog signal is filtered and output as a sine and cosine analog signal to control the resonator to be in a resonant state.

[0052] The embodiments of the present application include at least the following beneficial effects: The present application provides a resonator control system based on digital phase-locked amplification and a control method thereof, which performs data preprocessing on the output response signal of the resonator to obtain an output response digital signal, further generates a phase error value and an amplitude error value to dynamically adjust the output response digital signal to obtain a corrected output digital signal, and achieves accurate frequency locking and gain adjustment while ensuring fast response through a numerically controlled phase-locked loop. The sampling digitalization system of the present invention has a much stronger ability to resist external interference than traditional analog drive circuits. At the same time, the closed-loop negative feedback loop of the system increases the response bandwidth of the system. Finally, the corrected output digital signal is preprocessed, and a sine and cosine analog signal is output to control the resonator to be in a resonant state. The control coefficient can be adjusted accordingly according to the input target response speed, which greatly improves the flexibility of the system, and the closed-loop control effect can be displayed in real time through the control software module. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 1 is a schematic structural diagram of a resonator control system based on digital phase-locked amplification provided in an embodiment of the present application;

[0054] Figure 2 1 is a schematic flow chart of the steps of a resonator control method based on digital phase-locked amplification provided in an embodiment of the present application;

[0055] Figure 3 is a schematic diagram of a resonant state frequency locking structure provided in an embodiment of the present application;

[0056] Figure 4 This is a schematic diagram of the amplitude and phase structure calculation of the signal processing module provided in an embodiment of the present application based on digital phase-locked amplification technology.

[0057] Figure numerals: 101, front-end conditioning module; 102, first amplifier; 103, first filter; 104, analog-to-digital converter; 105, signal processing module; 106, demodulator; 107, phase-locked loop; 108, communication interface; 109, control software module; 110, resonator; 111, first DDS module; 112, second DDS module; 113, third DDS module; 114, drive signal generation module; 115, second filter; 116, second amplifier; 117, digital-to-analog converter. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application. They are merely examples of systems and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0059] It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various concepts, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0060] The terms "at least one", "plurality", "each", "any", etc. used in this application include "at least one", "two" or more, "plurality" or "each", "any" or "any one", "each" or "any one" as used herein.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0062] Reference Figure 1 , Figure 1 A schematic diagram of a resonator control system based on digital phase-locked amplification provided by an embodiment of the present invention, referring to Figure 1 The system includes a resonator 110, a front-end conditioning module 101, a signal processing module 105, a drive signal generation module 114, a communication interface 108, and a control software module 109. The output end of the front-end conditioning module is connected to the input end of the signal processing module, the first output end of the signal processing module is connected to the input end of the drive signal generation module, the output end of the drive signal generation module is connected to the input end of the resonator, the output end of the resonator is connected to the input end of the front-end conditioning module, the second output end of the signal processing module is connected to the input end of the communication interface, and the communication interface is connected to the control software module.

[0063] The resonator is used to perform resonance processing according to the excitation signal to obtain an output response signal of the resonator;

[0064] The front-end conditioning module is used to perform data preprocessing on the output response signal of the resonator to obtain a digital signal of the output response;

[0065] Specifically, the front-end conditioning module includes a first amplifier 102, a first filter 103 and an analog-to-digital converter 104. The output end of the first amplifier is connected to the input end of the first filter, and the output end of the first filter is connected to the input end of the analog-to-digital converter. The first amplifier is used to amplify the output response signal of the resonator to obtain an amplified output response signal; the first filter is used to filter the amplified output response signal to obtain a filtered output response signal; and the analog-to-digital converter is used to perform analog-to-digital conversion on the filtered output response signal to obtain an output response digital signal.

[0066] In some specific embodiments, the front-end conditioning module includes an amplifier, a filter, and an analog-to-digital converter, which respectively amplify, filter, and convert the input signal into a digital signal.

[0067] The signal processing module is used to generate a phase error value and an amplitude error value to dynamically adjust the output response digital signal to obtain a corrected output digital signal;

[0068] Specifically, the signal processing module includes a demodulator 106, a phase-locked loop 107 and a direct digital frequency synthesis signal generator. The output end of the demodulator and the output end of the phase-locked loop are respectively connected to the input end of the direct digital frequency synthesis signal generator, and the output end of the direct digital frequency synthesis signal generator is feedback-connected to the input end of the demodulator. The demodulator is used to demodulate the output response digital signal to obtain the actual amplitude and actual phase of the output response digital signal; perform difference calculation between the actual amplitude and the actual phase and the target value respectively to obtain the phase error value and the amplitude error value; the phase-locked loop is used to perform frequency locking processing on the output response digital signal to obtain the actual frequency of the output response digital signal; the direct digital frequency synthesis signal generator generates a sine signal and a cosine signal of the same frequency according to the actual frequency of the output response digital signal, which are used for the demodulator to calculate the actual amplitude and actual phase of the output response digital signal, and dynamically adjust the output response digital signal according to the phase error value and the amplitude error value to obtain a corrected output digital signal.

[0069] Furthermore, it should be noted that the direct digital frequency synthesis signal generator includes a first DDS module 111, a second DDS module 112 and a third DDS module 113, wherein the first DDS module is used to generate a cosine reference signal of the same frequency as the actual frequency of the output response digital signal to control the demodulation work of the demodulator; the second DDS module is used to generate a sine reference signal of the same frequency as the actual frequency of the output response digital signal to control the demodulation work of the demodulator; the third DDS module is used to dynamically adjust the output response digital signal according to the phase error value and the amplitude error value to obtain a corrected output digital signal.

[0070] In some specific embodiments, the signal processing module includes a demodulator, a phase-locked loop (PLL), and a direct digital synthesizer (DDS). This module is used to generate discrete sine / cosine signals, wherein the first and second DDS modules are used to generate reference signals for the demodulator, and the third DDS module is used to control the output of the drive signal generation module. The frequency of the signal can be controlled directly by the control software module through a communication interface or adjusted based on the frequency locked by the phase-locked loop (PLL). The amplitude and phase information of the signal can be controlled directly by the control software module through the communication interface or adjusted based on the error between the amplitude and phase information demodulated by the demodulator and the target value.

[0071] The driving signal generation module is used to perform signal preprocessing on the corrected output digital signal and output sine and cosine analog signals to control the resonator to be in a resonant state;

[0072] Specifically, the drive signal generating module includes a digital-to-analog converter 117, a second amplifier 116 and a second filter 115, the output end of the digital-to-analog converter is connected to the input end of the second amplifier, and the output end of the second amplifier is connected to the input end of the second filter, wherein the digital-to-analog converter is used to perform digital-to-analog conversion on the corrected output digital signal to obtain a converted output analog signal; the second amplifier is used to amplify the converted output analog signal to obtain an amplified output analog signal; the second filter is used to filter the amplified output analog signal and output a sine and cosine analog signal to control the resonator to be in a resonant state.

[0073] In some specific embodiments, the driving signal generating module includes a filter, an amplifier, and a digital-to-analog converter, which is responsible for converting the digital signal generated by direct digital frequency synthesis (DDS) into an analog signal for exciting the resonator to operate in a resonant state.

[0074] The communication interface is used to control signal transmission between the signal processing module and the control software module;

[0075] The control software module is used to display the characteristic information and waveform of the output signal of the resonator.

[0076] In summary, the resonator control system according to the embodiment of the present invention includes a front-end conditioning module, a signal processing module, a driving signal generating module, a communication interface, and a control software module. Among them, the front-end conditioning module includes three parts: an amplifier, a filter, and an analog-to-digital converter. This module is used to process the output signal of the resonator in the resonant state. After the signal is input into the front-end conditioning module, it is amplified and filtered, and then converted into a digital signal by the analog-to-digital converter to facilitate the operation of the signal processing module. The signal processing module includes three parts: a demodulator, a phase-locked loop (PLL), and a direct digital frequency synthesis (DDS) signal generator. The demodulator is used to calculate the actual amplitude of the resonator's output signal. The phase-locked loop is used to lock the actual frequency of the resonator's output signal. The direct digital frequency synthesis (DDS) signal generator can adjust the output of the signal generation module based on the amplitude and frequency information obtained by the demodulator and the phase-locked loop, and is also used to provide an orthogonal reference signal to the demodulator. The drive signal generation module includes three parts: a digital-to-analog converter, an amplifier, and a filter. This module generates sine and cosine analog signals of different frequencies or amplitudes based on the output of the direct digital frequency synthesis (DDS) signal generator to drive the resonator to operate in the resonant state. The communication interface is used for data transmission and communication. The control software can be used to adjust the output of the direct digital frequency synthesis (DDS) signal generator and display the characteristic information or waveform of the resonator's output signal.

[0077] See also Figure 2 The present application also provides a method for controlling a resonator based on digital phase-locked amplification, which can implement the above-mentioned resonator control system based on digital phase-locked amplification. The method includes the following steps:

[0078] S100, performing resonance processing according to the excitation signal to obtain an output response signal of the resonator;

[0079] S200, performing data preprocessing on the output response signal of the resonator to obtain an output response digital signal;

[0080] It should be noted that, in some embodiments, step S200 may include: S210, amplifying the output response signal of the resonator to obtain an amplified output response signal; S220, filtering the amplified output response signal to obtain a filtered output response signal; S230, performing analog-to-digital conversion on the filtered output response signal to obtain an output response digital signal.

[0081] S300, generating a phase error value and an amplitude error value to dynamically adjust the output response digital signal to obtain a corrected output digital signal;

[0082] It should be noted that, in some embodiments, step S300 may include: S310, determining the actual frequency of the output response digital signal; S320, generating a sine reference signal with the same frequency and a cosine reference signal with the same frequency according to the actual frequency; S330, demodulating the output response digital signal according to the sine reference signal and the cosine reference signal to obtain the actual amplitude and the actual phase; S340, performing difference calculation on the actual amplitude and the actual phase with the target amplitude and the target phase respectively to obtain an error value; S350, dynamically adjusting the output response digital signal according to the error value to obtain a corrected output digital signal.

[0083] S400, performing signal preprocessing on the corrected output digital signal, and outputting a sine and cosine analog signal to control the resonator to be in a resonant state;

[0084] It should be noted that, in some embodiments, step S400 may include: S410, performing digital-to-analog conversion on the corrected output digital signal to obtain a converted output analog signal; S420, amplifying the converted output analog signal to obtain an amplified output analog signal; S430, filtering the amplified output analog signal, and outputting a sine and cosine analog signal to control the resonator to be in a resonant state.

[0085] In some specific embodiments, if the excitation signal applied to the resonator is:

[0086] F(t)=A(t)sin(ω c t)

[0087] Among them, ω c is any frequency.

[0088] Then the output response of the resonator can be expressed as:

[0089] x(t)=G(A,ω c )·A(t)sin(ω c t+φ)

[0090] Among them, G(A,ω c ) is the gain of the system, which depends on the excitation amplitude A and the frequency ω c φ is the phase of the output signal, which depends on the frequency of the excitation signal ω c , in order to make the resonator work in the resonant state, then ω c It needs to be synchronized with the change of the natural resonant frequency of the resonator, and at the same time it needs to be based on the actual amplitude G(A,ω) of the resonator output signal. c )·A(t) is used to adjust the amplitude of the excitation signal A(t).

[0091] Further, if Figure 4As shown, in order to obtain the amplitude, frequency, phase and other information of the resonator output response, the embodiment of the present invention adopts digital phase-locked amplification technology. For the above output response, its expression is:

[0092] x(t)=G(A,ω c )·A(t)sin(ω c t+φ)

[0093] The signal processing module generates two reference signals, namely the in-phase reference signal R I (t) = cos(ω c t) and the orthogonal reference signal R Q (t) = sin(ω c t), the input signal x(t) is compared with the reference signal R I (t) and R Q (t) and then integrated to obtain the in-phase components, which are expressed as follows:

[0094]

[0095] The orthogonal components are expressed as:

[0096]

[0097] Since the digital system is a discrete-time system, summation is used instead of integration in the actual operation process, and the calculation expression is:

[0098]

[0099] Furthermore, using the orthogonality relationship, its expression is:

[0100]

[0101] Combined with X I With X Q ,get:

[0102]

[0103] For the current frequency ω c The excitation signal, the actual resonant frequency of the resonator is ω d , and ω d The drift will occur due to the influence of non-ideal factors. The resonant frequency of the resonator is ω m (t). Then the frequency error signal is:

[0104] e ω (t) = ω c -ω m (t)

[0105] And ωm The change of (t) is random, so it is impossible to get an accurate e ω (t), that is, the frequency error signal cannot be used as the input of feedback regulation.

[0106] Since the amplitude and phase of the resonator output response are both dependent on the frequency, the frequency of the excitation signal can be adjusted based on the amplitude or phase information of the output response, and the amplitude, phase and other information are obtained by the above-mentioned digital phase-locked amplification technology.

[0107] Therefore, the embodiment of the present invention also provides a resonator control method based on digital phase-locked amplification technology. If the excitation signal currently applied to the resonator is F(t)=A(t)sin(ω c t), the output response of the resonator can be expressed as x(t) = G(A,ω c )·A(t)sin(ω c t+θ), the phase value of the output response obtained by the signal processing module is θ, and the phase error value is e θ (t); the amplitude error value is e G (t). Then the feedback control signals are:

[0108]

[0109]

[0110] The direct digital frequency synthesis (DDS) signal generator in the signal processing module is based on the e θ (t) and e G (t) Real-time adjustment of the output of the driving signal generation module is Then we get the new phase error value and amplitude error value Then, the output signal of the driving signal generating module is adjusted according to the new error value.

[0111] Throughout the closed-loop system, signal adjustment speed is proportional to signal noise. Therefore, the system adjustment speed in the present invention is adjustable, providing greater operational flexibility compared to traditional resonator control systems. System adjustment speed can be measured using a time constant, a parameter that requires a compromise between desired response time and signal-to-noise ratio.

[0112] In summary, for a controlled resonator, the embodiment of the present invention first performs a frequency sweep analysis to determine the approximate range of its resonant state frequency. Based on the frequency sweep results, the system's excitation signal generation module generates an excitation signal with a frequency approximately equal to the resonant state frequency to drive the resonator. The resonator responds to the excitation signal. This response is processed by the system's front-end conditioning module, and the phase-locked loop (PLL) locks the signal frequency. The demodulator calculates the amplitude and phase information of the resonator's output response based on the frequency. Based on the resonator's own frequency characteristics, the error between the resonator's output response under the current excitation signal and its output response in the resonant state can be determined. The system adjusts the output of the excitation signal generation module based on this error value and recalculates the amplitude and phase information of the resonator. A new error value is obtained, and the above adjustment is repeated until the error value approaches 0. At this point, the system has locked the resonator's resonant state. The digital phase-locked amplification technology can achieve precise amplitude control and frequency tracking, and the frequency can be arbitrarily adjusted, which has higher universality. At the same time, the digital loop is basically unaffected by external factors and can achieve higher linearity and stability.

[0113] Since the system of the present invention adopts digital signal processing, it can be expanded to any number of channels, such as Figure 3 A dual-channel resonator control system was demonstrated. The cost increase associated with expanding the number of channels is significantly less than that associated with traditional analog loop control methods. Therefore, the system can be expanded to multi-modal resonators.

[0114] Therefore, compared with the prior art, the embodiments of the present invention have the following improvements:

[0115] 1) The resonator control system of the present invention utilizes a digitally controlled phase-locked loop (PLL) to achieve precise frequency locking and gain adjustment while ensuring rapid response. The digital sampling system of the present invention offers far greater resistance to external interference than traditional analog drive circuits. Furthermore, the system's closed-loop negative feedback loop increases the system's response bandwidth. Furthermore, the control coefficient can be adjusted based on the input target response speed, significantly enhancing system flexibility. The closed-loop control effect can be displayed in real time via the control software module.

[0116] 2) The embodiment of the present invention is composed of a front-end conditioning module, a signal processing module, a drive signal generation module, a communication interface, and a control software module. The system has a high degree of integration and the number of control channels can be freely expanded, which greatly improves the versatility of the present invention.

[0117] 3) In the resonator control system of the embodiment of the present invention, the resonant state frequency locking and the system gain adjustment act on the same output, but are controlled by different closed-loop feedback loops, effectively avoiding interference between different adjustment parameters.

[0118] It can be understood that the contents of the above method embodiments are all applicable to the present system embodiments, the functions specifically implemented by the present system embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0119] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention should be within the scope of the present invention.

Claims

1. A resonator control system based on digital phase-locked amplification, characterized in that: The system includes a resonator, a front-end conditioning module, a signal processing module, a drive signal generation module, a communication interface and a control software module, wherein the output end of the front-end conditioning module is connected to the input end of the signal processing module, the first output end of the signal processing module is connected to the input end of the drive signal generation module, the output end of the drive signal generation module is connected to the input end of the resonator, the output end of the resonator is connected to the input end of the front-end conditioning module, the second output end of the signal processing module is connected to the input end of the communication interface, and the communication interface is connected to the control software module, wherein: The resonator is used to perform resonance processing according to the excitation signal to obtain an output response signal of the resonator; The front-end conditioning module is used to perform data preprocessing on the output response signal of the resonator to obtain an output response digital signal; The signal processing module is used to generate a phase error value and an amplitude error value to dynamically adjust the output response digital signal to obtain a corrected output digital signal; The driving signal generating module is used to perform signal preprocessing on the corrected output digital signal and output a sine and cosine analog signal to control the resonator to be in a resonant state; The communication interface is used to control signal transmission between the signal processing module and the control software module; The control software module is used to display characteristic information and waveform of the output signal of the resonator.

2. The system according to claim 1, wherein: The front-end conditioning module includes a first amplifier, a first filter, and an analog-to-digital converter, wherein the output of the first amplifier is connected to the input of the first filter, and the output of the first filter is connected to the input of the analog-to-digital converter, wherein: The first amplifier is used to amplify the output response signal of the resonator to obtain an amplified output response signal; The first filter is used to filter the amplified output response signal to obtain a filtered output response signal; The analog-to-digital converter is used to perform analog-to-digital conversion processing on the filtered output response signal to obtain a digital signal of the output response.

3. The system according to claim 1, wherein: The signal processing module includes a demodulator, a phase-locked loop, and a direct digital frequency synthesis signal generator. The output end of the demodulator and the output end of the phase-locked loop are respectively connected to the input end of the direct digital frequency synthesis signal generator, and the output end of the direct digital frequency synthesis signal generator is feedback-connected to the input end of the demodulator, wherein: The demodulator is used to demodulate the output response digital signal to obtain the actual amplitude and actual phase of the output response digital signal; Calculating the difference between the actual amplitude and the actual phase and the target value respectively to obtain a phase error value and an amplitude error value; The phase-locked loop is used to perform frequency locking processing on the output response digital signal to obtain the actual frequency of the output response digital signal; The direct digital frequency synthesis signal generator is used to generate a sine signal and a cosine signal of the same frequency according to the actual frequency of the output response digital signal, and is used for the demodulator to calculate the actual amplitude and actual phase of the output response digital signal, and dynamically adjust the output response digital signal according to the phase error value and the amplitude error value to obtain a corrected output digital signal.

4. The system according to claim 3, characterized in that The direct digital frequency synthesis signal generator includes a first DDS module, a second DDS module and a third DDS module, wherein: The first DDS module is used to generate a cosine reference signal with the same frequency as the actual frequency of the output response digital signal to control the demodulation operation of the demodulator; The second DDS module is used to generate a sinusoidal reference signal with the same frequency as the actual frequency of the output response digital signal to control the demodulation operation of the demodulator; The third DDS module is used to dynamically adjust the output response digital signal according to the phase error value and the amplitude error value to obtain a corrected output digital signal.

5. The system according to claim 1, wherein: The driving signal generating module includes a digital-to-analog converter, a second amplifier and a second filter, wherein the output of the digital-to-analog converter is connected to the input of the second amplifier, and the output of the second amplifier is connected to the input of the second filter, wherein: The digital-to-analog converter is used to perform digital-to-analog conversion on the corrected output digital signal to obtain a converted output analog signal; The second amplifier is used to amplify the converted output analog signal to obtain an amplified output analog signal; The second filter is used to filter the amplified output analog signal and output a sine and cosine analog signal to control the resonator to be in a resonant state.

6. A resonator control method based on digital phase-locked amplification, characterized in that: The method comprises the following steps: Perform resonance processing according to the excitation signal to obtain an output response signal of the resonator; performing data preprocessing on the output response signal of the resonator to obtain an output response digital signal; Generating a phase error value and an amplitude error value to dynamically adjust the output response digital signal to obtain a corrected output digital signal; The corrected output digital signal is subjected to signal preprocessing, and a sine-cosine analog signal is output to control the resonator to be in a resonant state.

7. The method according to claim 6, characterized in that The performing data preprocessing on the output response signal of the resonator to obtain an output response digital signal includes: amplifying the output response signal of the resonator to obtain an amplified output response signal; performing filtering processing on the amplified output response signal to obtain a filtered output response signal; Performing analog-to-digital conversion on the filtered output response signal to obtain a digital signal of the output response.

8. The method according to claim 6, characterized in that The generating of the phase error value and the amplitude error value to dynamically adjust the output response digital signal to obtain a corrected output digital signal includes: determining an actual frequency of the digital signal of the output response; generating a sine reference signal having the same frequency and a cosine reference signal having the same frequency according to the actual frequency; Demodulating the digital signal of the output response according to the sine reference signal and the cosine reference signal to obtain an actual amplitude and an actual phase; Calculating the difference between the actual amplitude and the actual phase and the target amplitude and the target phase respectively to obtain an error value; Dynamically adjust the output response digital signal according to the error value to obtain the corrected output digital signal.

9. The method according to claim 8, characterized in that The expression of the feedback control signal is specifically as follows: In the above formula, u θ (t) represents the phase feedback control signal, u G (t) represents the amplitude feedback control signal, θ represents the phase value of the output response signal, E θ (T) represents the phase error value, e G (t) represents the amplitude error value, F p Indicates the proportional gain, F i Indicates the integral gain, F d Denotes the differential gain, F f represents the feedforward gain, f θ (t) represents the feedforward signal, G p Represents the proportional gain, G i Indicates the integral gain, G d Denotes the differential gain, G f represents the feedforward gain, f G (t) represents the feedforward signal.

10. The method according to claim 6, characterized in that The performing signal preprocessing on the corrected output digital signal and outputting a sine and cosine analog signal to control the resonator to be in a resonant state includes: Performing digital-to-analog conversion on the corrected output digital signal to obtain a converted output analog signal; amplifying the converted output analog signal to obtain an amplified output analog signal; The amplified output analog signal is filtered and output as a sine and cosine analog signal to control the resonator to be in a resonant state.

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