CN117691995A

CN117691995A - Phase-locked loop control method, apparatus, device and computer readable storage medium

Info

Publication number: CN117691995A
Application number: CN202410155379.7A
Authority: CN
Inventors: 吴能峰; 任磊
Original assignee: Invt Power Sytem Shenzhen Co ltd
Current assignee: Invt Power Sytem Shenzhen Co ltd
Priority date: 2024-02-04
Filing date: 2024-02-04
Publication date: 2024-03-12

Abstract

The application discloses a control method, a device, equipment and a computer readable storage medium of a phase-locked loop, which belong to the technical field of power electronics, and the method comprises the following steps: when the phase-locked loop is required to track the frequency of the target signal of the current running beat, delaying the target signal to obtain a target delay signal; extracting the transient center frequency of a target signal through an orthogonal signal generator to obtain a first frequency; extracting the transient center frequency of the target delay signal through the orthogonal signal generator to obtain a second frequency; and estimating the actual center frequency of the target signal in the current running beat according to the first frequency and the second frequency, and feeding the actual center frequency of the target signal in the current running beat forward to the phase-locked loop. In the method, when the phase-locked loop carries out frequency tracking on the target signal, the process of calculating the actual center frequency of the target signal by using the PI control loop in the phase-locked loop can be omitted, so that the phase-locked loop can track the target signal more accurately and rapidly.

Description

Phase-locked loop control method, apparatus, device and computer readable storage medium

Technical Field

The present invention relates to the field of power electronics, and in particular, to a method, an apparatus, a device, and a computer readable storage medium for controlling a phase locked loop.

Background

In a UPS (Uninterruptible Power Supply ), a phase locked loop is required on both the input and output sides to ensure safe operation of the UPS. For the input side of the UPS, the input current of the UPS needs to track the input voltage signal with a phase locked loop, so as to implement correction of the power factor. For the output side of the UPS, a phase locked loop is required to track the bypass voltage signal in the UPS, and if the phase locked loop cannot accurately track the bypass voltage signal, an inversion shutdown bypass will occur, thereby creating a risk of power loss. Thus, phase locked loops play a very important role in UPS.

In the existing pll control method, the feedforward frequency value of the pll is usually set to a fixed frequency value. When the phase-locked loop is used for tracking the target signal, besides the feedforward fixed frequency value, the PI (Proportional Integral ) control loop in the phase-locked loop is used for calculating the actual center frequency of the target signal at the current running beat to track the target signal.

In the setting mode, when the target signal fluctuates in a large range, the PI control loop in the phase-locked loop needs to calculate the frequency change of the target signal according to the feedforward fixed frequency value, so that the actual center frequency of the target signal under the current running beat can be determined, the PI control loop in the phase-locked loop cannot calculate the actual center frequency of the target signal quickly, the output loop of the phase-locked loop can reach saturation or exceed the bandwidth of the output loop, and the phase-locked loop cannot track the target signal accurately and quickly. When the target signal to be tracked by the phase-locked loop frequently fluctuates in a small range, the phase-locked loop basically does not consider the fixed frequency value fed forward to the phase-locked loop, but the PI control loop in the phase-locked loop is completely relied on to calculate the actual center frequency of the target signal under the current running beat, so that the time required to be adjusted when the phase-locked loop performs frequency tracking on the target signal is long, and the target signal cannot be tracked rapidly.

Therefore, how to make the phase-locked loop accurately and rapidly track the target signal is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

Accordingly, an objective of the present invention is to provide a method, apparatus, device and computer readable storage medium for controlling a phase-locked loop, so as to solve the technical problem that the phase-locked loop in the prior art cannot accurately and rapidly track a target signal. The specific scheme is as follows:

in order to solve the above technical problems, the present invention provides a control method of a phase-locked loop, including:

when the phase-locked loop is required to track the frequency of a target signal in the current running beat, delaying the target signal to obtain a target delay signal;

extracting the transient center frequency of the target signal through an orthogonal signal generator to obtain a first frequency;

extracting the transient center frequency of the target delay signal through the orthogonal signal generator to obtain a second frequency;

and estimating the actual center frequency of the target signal under the current running beat according to the first frequency and the second frequency, and feeding the actual center frequency of the target signal under the current running beat forward to the phase-locked loop.

Preferably, the process of extracting the transient center frequency of the target signal by the orthogonal signal generator to obtain the first frequency includes:

Extracting mutually orthogonal signals in the target signal through the orthogonal signal generator to obtain a first signal and a second signal;

estimating the transient center frequency of the target signal under the current running beat according to the first difference value, the first signal and the second signal to obtain the first frequency; wherein the first difference is a difference between the target signal and the first signal;

correspondingly, the process of extracting the transient center frequency of the target delay signal by the orthogonal signal generator to obtain the second frequency includes:

extracting mutually orthogonal signals in the target delay signal through the orthogonal signal generator to obtain a third signal and a fourth signal;

estimating the transient center frequency of the target signal under the current running beat according to the second difference value, the third signal and the fourth signal to obtain the second frequency; wherein the second difference is a difference between the target delay signal and the third signal.

Preferably, the method further comprises:

measuring a time interval of two zero crossings of the target signal;

estimating the transient center frequency of the target signal under the current running beat according to the time interval to obtain a third frequency;

The estimating the actual center frequency of the target signal at the current running beat according to the first frequency and the second frequency comprises the following steps:

and estimating the actual center frequency of the target signal under the current running beat according to the first frequency, the second frequency and the third frequency.

Preferably, said estimating an actual center frequency of the target signal at the current running beat according to the first frequency, the second frequency and the third frequency includes:

correcting the first frequency according to the amplitude of the target signal to obtain a first corrected frequency;

correcting the second frequency according to the amplitude of the target delay signal to obtain a second correction frequency;

and estimating the actual center frequency of the target signal under the current running beat according to the first correction frequency, the second correction frequency and the third frequency.

Preferably, the method further comprises:

performing low-pass filtering processing on the target transmission value to obtain a low-pass filtering value; wherein the target transfer value is a product of the second difference value and the second signal;

determining a frequency compensation value of the target signal under the current running beat according to the low-pass filtering value;

Accordingly, the process of estimating the actual center frequency of the target signal at the current running beat according to the first correction frequency, the second correction frequency and the third frequency includes:

and estimating the actual center frequency of the target signal under the current running beat according to the first correction frequency, the second correction frequency, the third frequency and the frequency compensation value.

Preferably, the process of determining the frequency compensation value of the target signal at the current running beat according to the low-pass filtering value includes:

if the low-pass filtering value is larger than a preset value, determining the difference value between the actual center frequency of the target signal in the last operation beat and the preset step length as a frequency compensation value of the target signal in the current operation beat.

if the low-pass filtering value is smaller than or equal to a preset value, determining the sum of the actual center frequency of the target signal under the previous running beat and a preset step length as a frequency compensation value of the target signal under the current running beat.

In order to solve the above technical problem, the present invention further provides a control device of a phase-locked loop, including:

the delay module is used for delaying the target signal to obtain a target delay signal when the phase-locked loop is required to carry out frequency tracking on the target signal under the current running beat;

the first extraction module is used for extracting the transient center frequency of the target signal through the orthogonal signal generator to obtain a first frequency;

the second extraction module is used for extracting the transient center frequency of the target delay signal through the orthogonal signal generator to obtain a second frequency;

and the estimation module is used for estimating the actual center frequency of the target signal under the current running beat according to the first frequency and the second frequency and feeding the actual center frequency of the target signal under the current running beat forward to the phase-locked loop.

a memory for storing a computer program;

a processor for implementing the steps of the control method of the phase locked loop as described above when executing the computer program.

In order to solve the above technical problem, the present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the control method of a phase locked loop as disclosed above.

The beneficial effects are that: in the invention, when the phase-locked loop is to track the frequency of the target signal in the current running beat, the target signal is delayed to obtain a target delay signal. After the target signal is delayed, the center frequency of the target delayed signal is not changed under each running beat relative to the target signal, so that after the target signal is delayed, the target delayed signal is obtained, which is equivalent to obtaining a signal with two center frequencies which can be kept consistent. Then, the transient center frequency of the target signal is extracted through the orthogonal signal generator to obtain a first frequency, and the transient center frequency of the target signal under the current running beat can be calculated through the step. Then, the transient center frequency of the target delay signal is extracted through the orthogonal signal generator to obtain a second frequency, and the transient center frequency of the target signal under the current running beat can be calculated through the step. Because the first frequency and the second frequency can both represent the transient center frequency of the target signal under the current running beat, when the actual center frequency of the target signal under the current running beat is calculated according to the first frequency and the second frequency, the deviation existing in the calculation result can be reduced, and therefore the actual center frequency of the target signal under the current running beat can be estimated more accurately. And finally, feeding the actual center frequency of the target signal under the current running beat to a phase-locked loop to track the frequency of the target signal.

Compared with the prior art, in the method, when the phase-locked loop performs frequency tracking on the target signal, the actual center frequency of the target signal is estimated in real time by using the orthogonal signal generator instead of being calculated by relying on the PI control loop in the phase-locked loop, so that the process of calculating the actual center frequency of the target signal by using the PI control loop in the phase-locked loop is omitted when the phase-locked loop performs frequency tracking on the target signal. In the method, the phase-locked loop not only can acquire the actual center frequency of the target signal under the current running beat through the feedforward frequency value, but also can introduce the actual center frequency of the target signal under the current running beat into the whole control loop of the phase-locked loop more quickly, so that the phase-locked loop can accurately and quickly track the target signal.

In the setting mode, when the target signal fluctuates in a large range, if the PI control loop in the phase-locked loop is used to calculate the actual center frequency of the target signal in the current running beat, the frequency change of the target signal needs to be calculated according to the feedforward fixed frequency value, one running beat and one running beat, so that a great amount of time can be spent. When the target signal fluctuates in a small range, the method of the invention feeds forward the actual center frequency of the target signal estimated in real time by the orthogonal signal generator to the phase-locked loop under the current running beat, so that the process of calculating the actual center frequency of the target signal by utilizing the feedforward fixed frequency value by utilizing the PI control loop in the phase-locked loop can be avoided, and compared with the calculation process of the PI control loop, the calculation process of the orthogonal signal generator has a faster calculation speed, so that the target signal can be tracked more quickly by the method. In addition, the advantages of the method of the present invention are more apparent when the target signal fluctuates widely. In summary, the method of the present invention can make the phase-locked loop track the target signal more accurately and rapidly. Correspondingly, the control device, the device and the medium of the phase-locked loop provided by the invention have the beneficial effects.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flowchart of a control method of a phase-locked loop according to an embodiment of the present invention;

fig. 2 is a block diagram of a phase-locked loop based on an orthogonal signal generator according to an embodiment of the present invention;

FIG. 3 is a block diagram of a quadrature signal generator according to an embodiment of the present invention;

FIG. 4 is a block diagram of another quadrature signal generator according to an embodiment of the present invention;

fig. 5 is a block diagram of another phase-locked loop based on a quadrature signal generator according to an embodiment of the present invention;

FIG. 6 is a block diagram of a phase locked loop based on a quadrature signal generator according to an embodiment of the present invention;

fig. 7 is a block diagram of a control device of a phase-locked loop according to an embodiment of the present invention;

fig. 8 is a block diagram of a control device of a phase-locked loop according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, fig. 1 is a flowchart of a control method of a phase-locked loop according to an embodiment of the present invention, where the method includes:

step S11: when the phase-locked loop is required to track the frequency of the target signal in the current running beat, the target signal is delayed to obtain a target delay signal.

Step S12: and extracting the transient center frequency of the target signal by the orthogonal signal generator to obtain a first frequency.

Step S13: and extracting the transient center frequency of the target delay signal by the orthogonal signal generator to obtain a second frequency.

Step S14: and estimating the actual center frequency of the target signal at the current running beat according to the first frequency and the second frequency, and feeding the actual center frequency of the target signal at the current running beat forward to the phase-locked loop.

Optionally, estimating the actual center frequency of the target signal at the current running beat according to the first frequency and the second frequency includes: and estimating the actual center frequency of the target signal under the current running beat according to the first frequency, the second frequency and the amplitude of the target signal.

Optionally, estimating the actual center frequency of the target signal at the current running beat according to the first frequency and the second frequency includes: and estimating the actual center frequency of the target signal under the current running beat according to the first frequency, the second frequency and the amplitude of the target delay signal.

Optionally, estimating the actual center frequency of the target signal at the current running beat according to the first frequency and the second frequency includes: and estimating the actual center frequency of the target signal under the current running beat according to the first frequency, the second frequency, the amplitude of the target signal and the amplitude of the target delay signal.

Referring to fig. 2, fig. 2 is a block diagram of a phase locked loop based on an orthogonal signal generator according to an embodiment of the present invention. In fig. 2, the transient center frequency of the target signal at the current running beat may be extracted by using the quadrature signal generator. The transient center frequency of the target signal in the current running beat refers to the center frequency of the target signal in the current running beat when the phase-locked loop does not reach a stable state in the running process, and the center frequency of the target signal in the current running beat refers to the average frequency of the target signal in the current running beat. In this application, the running clock refers to the time occupied by each control period in the real-time control system. For example: the current running beat of the program running is the time T1, then the last running beat is the time T0, and the next running beat is the time T2.

Specifically, the target signalAfter passing through the quadrature signal generator, the quadrature signal generator will be from the target signal +>Extracting a group of mutually orthogonal signals to obtain a first signal->And a second signal->Mutually orthogonal signals->And->After input to Park converter, it is converted into +.>Component of the coordinate system->And->。

In the course of this process, the process is carried out,is equation 1: />；

Is equation 2: />；

Is equation 3: />；

In the above-mentioned method, the step of,for the target signal +.>For the first signal, ++>For the second signal, ++>Is->And->The difference between the two,for angular frequency +.>Is->Representing a plurality.

Since equation 1 shows resonance characteristics, the target signal has a gain of 1 at the resonance frequency point, and the phase is substantially free from delay. Equation 2 has a gain of 1 at the resonance frequency point of the target signal, and the phase angle lags by 90 ° compared to equation 1.

From the above analysis, if the resonant frequency of the formulas 1 and 2 is the center frequency of the target signal, the quadrature signal generator generates the same signal as the target signal and a signal orthogonal to the target signal.

Obviously, if the center frequency of the orthogonal signal generator is set to be the same as the center frequency of the target signal, the orthogonal signal generator generates the same signal as the target signal and a signal orthogonal to the target signal. The quadrature signal generated by the quadrature signal generator is converted into a Park conversion Component of the coordinate system->And->. At this time by controlling +.>At zero, the transient center frequency of the target signal can be obtained. At this time, the transient center frequency of the target signal is fed forward into the phase-locked loopThe phase locked loop can be tracked in real time.

When the target signalAfter passing through the quadrature signal generator, the quadrature signal generator will be from the target signal +>Extracting a group of mutually orthogonal signals +.>And->. It is known from theoretical analysis that when the target signal +.>Signals orthogonal to each other->And->At the moment, it is possible to rely on the signal +.>And->Estimating the target signal +.>The transient center frequency at the current operating clock, which yields the first frequency +.>。

In the present application, in order to estimate the transient center frequency of the target signal more accurately at the current running clock, the target signal may be also calculatedDelay is carried out to obtain a target delay signal +.>And uses the target delay signal +.>To estimate the target signal +.>Transient center frequency at the current running beat. It will be appreciated that when the target signal is +.>After a delay, the target signal +.>The transient center frequency at the current operating clock is not changed, so the target delay signal is used>With this property feature it is possible to estimate the target signal +. >Transient center frequency at the current running beat.

In particular, the quadrature signal generator may delay the signal from the targetExtracting a group of mutually orthogonal signals +.>And->By signal->And->The transient center frequency of the target signal under the current running beat can be estimatedObtaining a second frequency->。

Optionally, when the first frequency is acquiredAnd a second frequency->And the two transient center frequencies of the target signal under the current running beat are obtained by estimation. At this time, by finding the first frequency +.>And a second frequency->Can estimate the target signal +.>The actual center frequency at the current operating clock +.>At this time, the target signal +.>The actual center frequency at the current operating clock +.>Feed forward to the phase locked loop, frequency tracking can be performed on the target signal.

In addition, since the amplitude of the target signal is an important parameter in the real operation state of the target signal, the amplitude of the target signal inevitably affects the actual center frequency of the target signal at the current operation beat in estimating the actual center frequency of the target signal at the current operation beat based on the first frequency and the second frequency. Based on this factor, when estimating the actual center frequency of the target signal at the current running beat from the first frequency and the second frequency, the actual center frequency of the target signal at the current running beat may also be estimated from the first frequency, the second frequency, and the amplitude of the target signal. Similarly, since the target delay signal and the target signal have the same attribute characteristics, when the actual center frequency of the target signal at the current running beat is estimated according to the first frequency and the second frequency, the actual center frequency of the target signal at the current running beat may be estimated according to the first frequency, the second frequency and the amplitude of the target delay signal, or the actual center frequency of the target signal at the current running beat may be estimated according to the first frequency, the second frequency, the amplitude of the target signal and the amplitude of the target delay signal.

It can be understood that in the method, when the phase-locked loop performs frequency tracking on the target signal, the actual center frequency of the target signal is estimated in real time by using the orthogonal signal generator instead of being calculated by relying on the PI control loop in the phase-locked loop, so that the phase-locked loop omits the process of calculating the actual center frequency of the target signal by using the PI control loop in the phase-locked loop when the phase-locked loop performs frequency tracking on the target signal. Through the arrangement mode, the phase-locked loop can accurately acquire the actual center frequency of the target signal under the current running beat through the feedforward frequency value, and the phase-locked loop can also more rapidly introduce the actual center frequency of the target signal under the current running beat into the whole control loop of the phase-locked loop, so that the phase-locked loop can more accurately and rapidly track the target signal.

It should be noted that, in the prior art, for the inverter side of the UPS, the phase-locked loop is required to track the bypass voltage signal in the UPS, if the inverter fails, the phase-locked loop cannot track the bypass voltage signal quickly, and the UPS cannot be switched to the bypass quickly, so that the load side of the UPS may be powered down. If the method provided by the application is applied to the scene, the bypass voltage signal in the UPS is equivalent to the target signal, and the discussion shows that the bypass voltage signal in the UPS can be tracked more accurately and rapidly by using the phase-locked loop control method provided by the application, so that the UPS can be directly switched to the bypass even if the inverter at the inversion side of the UPS fails, and the power failure of the load end of the UPS can be avoided or the power failure time of the load end of the UPS can be shortened. Moreover, the method can further improve the power supply safety of the UPS load end precision instrument.

When the power grid voltage at the input side of the UPS is short-circuited or broken to cause unbalance or distortion of the three-phase voltage, the method can feed forward the actual center frequency of the real-time estimated target signal under the current operation beat to the phase-locked loop to track the frequency of the target signal, and avoid the situation that the phase-locked loop fails, so that the adaptability of the phase-locked loop to severe working conditions can be improved.

In this embodiment, the orthogonal signal generator is used to process the target signal and the target delay signal to obtain the transient center frequency of the target signal under the current running beat, so as to obtain the first frequency and the second frequency, and the actual center frequency of the target signal under the current running beat is estimated according to the first frequency and the second frequency; and finally, feeding the actual center frequency of the target signal under the current running beat to a phase-locked loop to track the frequency of the target signal.

In this setting mode, when the target signal fluctuates in a large range, in this embodiment, the actual center frequency of the target signal under the current running beat estimated in real time by the orthogonal signal generator is fed forward to the phase-locked loop, so that the PI control loop in the phase-locked loop can avoid the process of calculating the actual center frequency of the target signal under the current running beat by using the fed-forward fixed frequency value, so that the output parameters of the whole control loop in the phase-locked loop can be adjusted more quickly when the frequency tracking is performed on the target signal, thereby avoiding the problem that the output loop is saturated or exceeds the bandwidth when the frequency tracking is performed on the target signal in the phase-locked loop in the prior art, and enabling the phase-locked loop to track the frequency of the target signal more accurately and quickly. When the target signal fluctuates in a small range, the method in this embodiment is to feed forward the actual center frequency of the target signal estimated in real time by the orthogonal signal generator to the phase-locked loop at the current running beat, so that the process of calculating the actual center frequency of the target signal by using the PI control loop in the phase-locked loop by using the fed-forward fixed frequency value can be avoided, and compared with the calculation process of the PI control loop, the calculation process of the orthogonal signal generator is faster, so that the target signal can be tracked more quickly by the method. In summary, the method described in this embodiment can make the phase-locked loop track the target signal more accurately and quickly.

Based on the above embodiment, this embodiment further describes and optimizes the technical solution, as a preferred implementation manner, the steps are as follows: the process of extracting the transient center frequency of the target signal by the orthogonal signal generator to obtain the first frequency comprises the following steps:

extracting mutually orthogonal signals in the target signal through an orthogonal signal generator to obtain a first signal and a second signal;

estimating the transient center frequency of the target signal under the current running beat according to the first difference value, the first signal and the second signal to obtain a first frequency; the first difference value is a difference value between the target signal and the first signal;

correspondingly, the process of extracting the transient center frequency of the target delay signal through the orthogonal signal generator to obtain the second frequency comprises the following steps:

extracting mutually orthogonal signals in the target delay signals through an orthogonal signal generator to obtain a third signal and a fourth signal;

estimating the transient center frequency of the target signal under the current running beat according to the second difference value, the third signal and the fourth signal to obtain a second frequency; the second difference value is a difference value between the target delay signal and the third signal.

In this embodiment, a process of determining the transient center frequency of the target signal at the current running beat using the quadrature signal generator is specifically described. Referring to FIG. 3, FIG. 3 shows the embodiment of the present invention The embodiment provides a structure diagram of a quadrature signal generator. From the target signal using a quadrature signal generatorExtracting a group of mutually orthogonal signals to obtain a first signal->And a second signal->. Wherein the first difference is->，/>. At this time, from the structural diagram shown in fig. 3, the following formula can be derived:

equation 101:；

equation 102:，/>is the first frequency.

Equation 103:，/>is->Is a derivative of (a).

Equation 104:，/>is->Is a derivative of (a).

It should be noted that becauseAnd->Are mutually orthogonal signals, so equation 104 can be derived.

Equation 105:。

equation 106:，/>is->Is a derivative of (a).

Equation 107:。

equation 108:。

equation 109:。

equation 110:。

equation 111:。

from equation 108, it can be seen that:

when the system reaches steady state，At this point, equation 112 is obtained: />

Substituting equation 112 into equation 109 yields equation 113.

Equation 113:

equation 114 can be derived from equation 111:。

ignoring the 2-fold sinusoidal ac component of equation 114 and substituting equation 114 into equation 113 yields equation 115:。

it will be appreciated that, when the system reaches steady state,at this time +.>Can be ignored. Then, it can be known from formula 115 that the target signal +.>Is defined by the transient center frequency (i.e., first frequency +. >) With the target signalIs related to the magnitude of (2) and its corresponding center frequency, and is therefore dependent on the first difference +.>First signal->A second signalThe target signal can be estimated>The transient center frequency at the current operating clock, i.e. the first frequency +.>。

Similarly, when the target delays the signalAfter passing through the quadrature signal generator, the quadrature signal generator delays the signal from the target>Extracting a group of mutually orthogonal signals to obtain a third signal->And a fourth signal->The method comprises the steps of carrying out a first treatment on the surface of the At this time, according to the second difference +>Third signal->And a fourth signal->It can be estimated that the target signal is +.>The transient center frequency at the current running clock, a second frequency +.>. Wherein,/>，/>。

obviously, by the technical scheme provided by the embodiment, the transient center frequency of the target signal under the current running beat can be accurately estimated.

As a preferred embodiment, the above method further comprises:

measuring a time interval of two zero crossings of the target signal;

estimating an actual center frequency of the target signal at the current running beat according to the first frequency and the second frequency, including:

It will be appreciated that due to the target signalIs a sine wave, so, by measuring the target signal +.>The zero crossing of (2) can also be roughly estimated as the target signal +.>Is set in the above-mentioned range). Specifically, the target signal +.>A time interval of two consecutive zero crossings; then, according to the target signal->The target signal can be estimated at the time interval of two consecutive zero crossings>The frequency at the current operating beat gives a third frequency +.>。

Assume thatFor the sampling value of the target signal at the previous operating cycle,/-, is given>For the sampling value of the target signal at the current operating clock,/, -, is given>To detect a zero crossing. In practical applications, it is possible to use a counter to clock the target signal first, if detected +.>And (2) a->At the time, the target signal +.>A zero crossing is passed. When two zero crossing points are detected, the count number of the counter can be latched by the latch to obtain +.>The method comprises the steps of carrying out a first treatment on the surface of the If +.>、/>At the time, the target signal +.>The counter can be used to continue to time the target signal without zero crossing 。

Since the time counted by the timer is known, the count number of the counter is obtained when the latch is used for latchingThe count number of the timer when the target signal passes through the two zero crossing points can be determined. At this time, the transient center frequency of the target signal under the current running clock can be estimated according to the count number of the latch counter and the time required by the timer to count once, and a third frequency +.>。

Optionally, estimating the actual center frequency of the target signal at the current running beat according to the first frequency, the second frequency and the third frequency includes: averaging the first frequency, the second frequency and the third frequency; and estimating the actual center frequency of the target signal under the current running beat according to the average processing result.

Optionally, estimating the actual center frequency of the target signal at the current running beat according to the first frequency, the second frequency and the third frequency includes: and estimating the actual center frequency of the target signal under the current running beat according to the first frequency, the second frequency, the amplitude of the target signal, the amplitude of the target delay signal and the third frequency.

Due to the first frequencySecond frequency- >And a third frequency->Are all estimated to be the target signal +.>The transient center frequency at the current operating clock, therefore, when the first frequency +.>Second frequency->And a third frequency->In this case, it is equivalent to obtaining a plurality of related target signals calculated by different technical means>The actual center frequency at the current operating clock is thus at the first frequency +.>Second frequency->And a third frequency->Calculating the target signal +.>In the case of the actual center frequency at the current operating clock, the use of a technical measure for the target signal can be reduced>Deviations present in the calculation result are calculated in the calculation of the transient center frequency at the current operating clock, whereby the target signal +.>The calculation result of the actual center frequency under the current running beat is more accurate and reliable.

Obviously, by the technical scheme provided by the embodiment, the actual center frequency of the target signal under the current running beat can be estimated more accurately.

As a preferred embodiment, the steps are as follows: a process for estimating an actual center frequency of a target signal at a current running beat based on a first frequency, a second frequency, and a third frequency, comprising:

As can be seen from the equation 115 of the above embodiment, the target signalIs set at the current operating beat (i.e., first frequency +.>) And (2) target signal->In this embodiment, in order to make the method provided in this application more universal, a control loop may be further added to the structure diagram shown in fig. 3 to eliminate the target signal +.>Is the magnitude of (and its corresponding center frequency for the target signal->Transient center frequency at the current operating clock>Is a function of (a) and (b).

Referring specifically to fig. 4, fig. 4 is a block diagram of another quadrature signal generator according to an embodiment of the present invention. The block diagram of fig. 4 is a control loop with a broken line block diagram portion added thereto as compared with the block diagram of fig. 3.

It can be appreciated that, due to equation 106: Can be written as formula 116: />

；

Due toAnd->For a set of mutually orthogonal signals, then equation 117 can be derived: />；

Equation 118 can be derived from equations 116 and 117:；

if it isFor the target signal->Then equation 119 can be derived: />；

Substituting formula 115 into formula 119 yields formula 120:

；

from equation 120, the target signal is knownThe transient center frequency (i.e., first frequency +.>) OnlyParameter->And->In this case, the target signal +_can be obtained by integrating the formula 120>Transient center frequency at the current running beat.

In other words, the control loop of the dashed block diagram part of FIG. 4 is used to control the target signal obtained from FIG. 3Transient center frequency at the current operating clock +.>Correcting to obtain a first correction frequency +.>. That is, after the control loop of the broken line block diagram part of FIG. 4 is introduced into the quadrature signal generator, the quadrature signal generator outputs the target signalAt the transient center frequency at the current operating clock, the target signal +.>The signal size and the center frequency thereof for the target signal +.>The influence of the calculated value of the transient center frequency at the current operating cycle makes it possible to make the target signal +. >The calculated value of the transient center frequency is more accurate under the current running beat.

Similarly, based on the broken line of FIG. 4The control loop of the block diagram portion may also utilize the target delay signalAmplitude versus second frequency->Correcting to obtain a second correction frequency +.>. In using the target delay signal->Amplitude versus second frequency of (2)In the course of the correction, the target delay signal can also be eliminated +.>Is the signal size and center frequency of (a) for the target delay signal +.>The influence of the calculated value of the transient center frequency at the current operating clock makes it possible to make the target delay signal +.>The calculated value of the transient center frequency is more accurate under the current running beat.

It is conceivable that when the first correction frequency is obtainedSecond correction frequency->After that, it is equivalent to obtaining the target signal +.>More accurate transient center frequency at the current running beat. At this time according to the first correction frequency +.>Second correction frequency->Third frequency->For target signal->When the transient center frequency is calculated at the current operating clock, not only the target signal +.>The influence of the signal size and the center frequency of the (input signal) on the calculation result can be avoided, and misjudgment on the calculation result by using a technical means can be avoided, so that the accuracy, reliability and credibility of the calculation result can be further improved.

In the case of the first frequencySecond frequency->Target signal->Amplitude +.>Target delay signal->Amplitude +.>And a third frequency->To estimate the target signal +.>At the actual center frequency at the current operating clock, this corresponds to the first correction frequency +.>Second correction frequency->Third frequency->To estimate the target signal +.>The transient center frequency at the current operating beat is not explained here.

And, as can be seen from equation 120, the target signalThe transient center frequency at the current operating clock is only related to the parameter +.>And->Related to the following. The target signal can be eliminated by means of the control loop of the dashed block part of fig. 4>The signal size and the center frequency thereof for the target signal +.>The influence of the calculated value of the transient center frequency at the current running clock, therefore, in practical application, the target signal is calculated using the quadrature signal generator>The transient center frequency value under the current running beat only needs to be focused on the parameters +.>And->The design and parameter adjustment are carried out without considering whether the target signal changes, so that the convenience of people in frequency tracking of the target signal by using the phase-locked loop can be further improved.

Fig. 5 is a block diagram of another phase locked loop based on a quadrature signal generator according to an embodiment of the present invention. As a preferred embodiment, the above method further comprises:

performing low-pass filtering processing on the target transmission value to obtain a low-pass filtering value; wherein the target transfer value is the product of the second difference value and the second signal;

accordingly, a process of estimating an actual center frequency of the target signal at the current operation beat based on the first correction frequency, the second correction frequency, and the third frequency includes:

In the present embodiment, in order to more rapidly estimate the actual center frequency of the target signal at the current running beatThe target transfer value can also be used>To correct the actual center frequency of the target signal at the current running beat.

Specifically, the target value may be transferred firstPerforming low-pass filtering treatment to obtain a low-pass filtering value; wherein,. It will be appreciated that due to the target transfer value +.>The transient center frequency +.>Is greater than the target signal->The actual center frequency at the current operating clock +.>Whether or not it is smaller than the target signal +.>The actual center frequency at the current operating clock +.>. Therefore, in practical application, the low-pass filtered value can also be used to determine the target signal +.>Frequency compensation value +.>And uses the frequency compensation value +.>To>The actual center frequency at the current operating clock +.>Make corrections toSo that the estimated target signal +.>The actual center frequency at the current operating clock +.>The real center frequency of the target signal at the current running beat can be more quickly approached.

It is conceivable that when the target signal is determinedFrequency compensation value +.>In this case, the frequency compensation value can be used>To>The actual center frequency at the current operating clock +.>Correction is performed so that the estimated target signal +. >The actual center frequency at the current operating clock +.>The real center frequency of the target signal at the current running beat can be more quickly approached.

In this arrangement, the quadrature signal generator can more accurately and rapidly calculate the first correction frequencyAnd a second correction frequency->. Obviously, when the first correction frequency +.>And a second correction frequency->When the calculation speed of (2) is faster, the first correction frequency can be calculated>Second correction frequency->And a third frequency->The average value is faster, whereby the target signal +.>The actual center frequency at the current operating clock +.>。

Obviously, by the technical scheme provided by the embodiment, the actual center frequency of the estimated target signal under the current running beat can be adjusted more quickly.

As a preferred embodiment, the steps are as follows: a process for determining a frequency compensation value for a target signal at a current operating beat based on the low pass filtered value, comprising:

if the low-pass filtering value is larger than the preset value, determining the difference value between the actual center frequency of the target signal in the last operation beat and the preset step length as a frequency compensation value of the target signal in the current operation beat.

In the present embodiment, it is assumed that the actual center frequency of the target signal at the last operation beat isThe preset step length is +.>Preset value of->. If the low-pass filtered value is greater than the preset value +.>Description of estimation of target Signal +.>Transient center frequency at the current operating clock +.>In this case, the actual center frequency of the target signal at the previous operating clock is increased>And a preset step length->Is determined as the frequency compensation value of the target signal at the current operating clock>. That is, when the low-pass filtered value is greater than the preset value +.>When (I)>。

if the low-pass filtering value is smaller than or equal to the preset value, determining the sum of the actual center frequency of the target signal in the last running beat and the preset step length as a frequency compensation value of the target signal in the current running beat.

If the low pass filtered value is less than or equal toEqual to a preset valueDescription of estimation of target Signal +.>Transient center frequency at the current operating clock +.>Smaller, in this case, the actual center frequency of the target signal at the last operating beat +. >And a preset step length->And is determined as the frequency compensation value of the target signal at the current operating clock>. That is, when the low-pass filtered value is less than or equal to the preset value +.>When (I)>。

In practical application, it is noted thatThe value is zero. Moreover, experimental results show that after the phase-locked loop is controlled by using the method provided by the application, compared with the traditional phase-locked loop control method, the phase-locked speed of the phase-locked loop can be improved by about 1.2 times.

Obviously, by the technical scheme provided by the embodiment, the estimated actual center frequency of the target signal under the current running beat can be used for more rapidly regulating and controlling the center frequency of the orthogonal signal generator, and the phase-locked loop can more accurately and rapidly track the target signal.

Based on the technical disclosure of the foregoing embodiments, a detailed description will be given here of the control method of the phase-locked loop disclosed above by means of a specific control loop. Referring to fig. 6, fig. 6 is a block diagram of a phase locked loop based on a quadrature signal generator according to an embodiment of the present invention.

In the present embodiment, when the phase-locked loop is to track the frequency of the target signal at the current running clock, the target signal is first tracked Delay is carried out to obtain a target delay signal +.>Then, the target signal +.>Amplitude +.>Introduced into the target Signal->In a quadrature signal generator of the transmission path, and extracting a target signal +.>The transient center frequency at the current running beat, get +.>

When the target signal is to be transmittedAmplitude +.>Introduced into the target Signal->Orthogonal signal generator when signal generator with transmission pathAt the output transient center frequency->At this time, the target signal can be eliminated +.>The signal size and the center frequency thereof for the target signal +.>The influence of the calculated value of the transient center frequency at the current operating cycle can thus be used to make the calculated +.>More accurate and reliable.

Similarly, the target delay signal is further generatedAmplitude +.>Is introduced into the target delay signal->In the quadrature signal generator of the transmission path, and the quadrature signal generator is used to extract the target delay signal +.>The transient center frequency at the current running beat, get +.>。

Then, by measuring the target signalTime intervals of two zero crossings in succession, and estimating the transient center frequency of the target signal at the current running beat according to the time intervals of the two zero crossings in succession >。

When obtaining、/>And->In this case, the +.>、/>And->To estimate the target signal +.>The actual center frequency at the current operating clock +.>. Obviously, the use of a technical means in the target signal can be reduced by such a calculation mode>The actual center frequency under the current running beat is calculated by the deviation, so that the calculation result is more accurate and reliable.

Furthermore, according to、/>And->To estimate the target signal +.>Actual center frequency at current running clockThe transfer value +.>And transfer value->To>Actual center frequency at current running clockCorrection is performed so that the estimated target signal +.>The actual center frequency at the current operating clock +.>The real center frequency of the target signal at the current running beat can be more quickly approached.

In particular, the transmission value canLow-pass filtering is performed if the transfer value +.>The low-pass filtered value of (2) is greater than zero, the target signal is +.>The actual center frequency at the last operating cycle +.>And a preset step length->Is determined as the difference of the target signal at the present timeFrequency compensation value in the operating clock >The method comprises the steps of carrying out a first treatment on the surface of the If the transfer value +.>Is less than or equal to zero, the target signal +.>The actual center frequency at the last operating cycle +.>And a preset step length->And, is determined as the target signal +>Frequency compensation value +.>. Similarly, the transmission value +.>Low-pass filtering is performed if the transfer value +.>The low-pass filtered value of (2) is greater than zero, the target signal is +.>The actual center frequency at the last operating cycle +.>The difference from the preset step is determined as the frequency compensation value +.>The method comprises the steps of carrying out a first treatment on the surface of the If the transfer value +.>Is less than or equal to zero, the target signal +.>The actual center frequency at the last operating cycle +.>And a preset step length->And, is determined as the target signal +>Frequency compensation value +.>。

To sum up, in the present application, the phase-locked loop is used to align the target signalDuring frequency tracking, the target signal +.>Is +.>Is made use of quadrature signal generator and target signal +.>Is obtained by real-time estimation of the actual zero crossing point of the target signal by means of a quadrature signal generator>Is +.>At the same time, the target signal is +>Is the actual center frequency of (2) Feed forward to a phase locked loop for frequency tracking of the target signal. In this process, not only the amplitude of the target signal is +.>(alternatively, the amplitude of the target delay signal +.>) Introduced into quadrature signal generator to eliminate target signal +.>Signal size and center frequency pair +.>And->Calculating the effect of the result and, in the case of +.>Is +.>In the course of the estimation, the preset step size +.>For target signal->The actual center frequency at the current operating clock +.>Is modified so that the estimated target signal +.>The actual center frequency at the current operating clock +.>The real center frequency of the target signal at the current running beat can be more quickly approached. Compared with the prior art, the method relies on the PI control loop in the phase-locked loop to calculate the target signal +.>Is +.>In other words, the method provided by the application can not only omit the actual center frequency of the target signal by using the PI control loop in the phase-locked loop>The calculation is performed and the phase-locked loop can also accurately acquire the target signal by the feedforward frequency value>Is +.>And +. >Is +.>More quickly introduced into the entire control loop of the phase-locked loop, thereby enabling the phase-locked loop to +.>And more accurate and rapid tracking is performed. />

Referring to fig. 7, fig. 7 is a block diagram of a control device of a phase-locked loop according to an embodiment of the present invention, where the device includes:

a delay module 21, configured to delay the target signal to obtain a target delay signal when the phase-locked loop is to perform frequency tracking on the target signal in the current operation beat;

a first extraction module 22, configured to extract a transient center frequency of the target signal by using the orthogonal signal generator, so as to obtain a first frequency;

a second extracting module 23, configured to extract a transient center frequency of the target delay signal by using the orthogonal signal generator, so as to obtain a second frequency;

the estimating module 24 is configured to estimate an actual center frequency of the target signal at the current running clock according to the first frequency and the second frequency, and feed forward the actual center frequency of the target signal at the current running clock to the phase-locked loop.

Preferably, the first extraction module 22 comprises:

a first signal extraction unit for extracting mutually orthogonal signals in the target signal through an orthogonal signal generator to obtain a first signal and a second signal;

The first frequency estimation unit is used for estimating the transient center frequency of the target signal under the current running beat according to the first difference value, the first signal and the second signal to obtain a first frequency; the first difference value is a difference value between the target signal and the first signal;

accordingly, the second extraction module 23 comprises:

the second signal extraction unit is used for extracting mutually orthogonal signals in the target delay signals through the orthogonal signal generator to obtain a third signal and a fourth signal;

the second frequency estimation unit is used for estimating the transient center frequency of the target signal under the current running beat according to the second difference value, the third signal and the fourth signal to obtain a second frequency; the second difference value is a difference value between the target delay signal and the third signal.

Preferably, the apparatus further comprises:

the zero crossing point measurement submodule is used for measuring the time interval of the zero crossing point of the target signal twice in succession;

a third frequency estimation sub-module, configured to estimate a transient center frequency of the target signal at a current running beat according to the time interval, to obtain a third frequency;

accordingly, the estimation module 24 includes:

and the first estimation submodule is used for estimating the actual center frequency of the target signal under the current running beat according to the first frequency, the second frequency and the third frequency.

Preferably, the first estimation submodule includes:

the first correction unit is used for correcting the first frequency according to the amplitude of the target signal to obtain a first correction frequency;

the second correction unit is used for correcting the second frequency according to the amplitude of the target delay signal to obtain a second correction frequency;

and a second estimating unit for estimating an actual center frequency of the target signal at the current running beat based on the first correction frequency, the second correction frequency, and the third frequency.

Preferably, the first estimation submodule further includes:

the filtering unit is used for performing low-pass filtering processing on the target transmission value to obtain a low-pass filtering value; wherein the target transfer value is the product of the second difference value and the second signal;

the compensation value determining unit is used for determining a frequency compensation value of the target signal under the current running beat according to the low-pass filtering value;

correspondingly, the second estimation unit comprises:

and the second estimation subunit is used for estimating the actual center frequency of the target signal under the current running beat according to the first correction frequency, the second correction frequency, the third frequency and the frequency compensation value.

Preferably, the compensation value determining unit includes:

and the first determination subunit is used for determining the difference value between the actual center frequency of the target signal under the previous running beat and the preset step length as the frequency compensation value of the target signal under the current running beat if the low-pass filtering value is larger than the preset value.

Preferably, the compensation value determining unit includes:

and the second determining subunit is used for determining the sum of the actual center frequency of the target signal under the last running beat and the preset step length as the frequency compensation value of the target signal under the current running beat if the low-pass filtering value is smaller than or equal to the preset value.

The control device of the phase-locked loop has the beneficial effects of the control method of the phase-locked loop.

Referring to fig. 8, fig. 8 is a block diagram of a control device of a phase-locked loop according to an embodiment of the present invention, where the device includes:

a memory 31 for storing a computer program;

a processor 32 for implementing the steps of the control method of the phase locked loop as disclosed above when executing a computer program.

The control device of the phase-locked loop provided by the embodiment of the invention has the beneficial effects of the control method of the phase-locked loop disclosed by the embodiment of the invention.

Correspondingly, the embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program realizes the steps of the control method of the phase-locked loop as disclosed in the previous description when being executed by a processor.

The computer readable storage medium provided by the embodiment of the invention has the beneficial effects of the control method of the phase-locked loop disclosed by the embodiment of the invention.

In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above detailed description of the method, apparatus, device and computer readable storage medium for controlling a phase locked loop provided by the present invention applies specific examples to illustrate the principles and embodiments of the present invention, and the above description of the examples is only used to help understand the method and core idea of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.

Claims

1. A method of controlling a phase locked loop, comprising:

2. The control method of a phase locked loop according to claim 1, further comprising:

measuring a time interval of two zero crossings of the target signal;

3. The method of controlling a phase locked loop according to claim 2, wherein estimating an actual center frequency of the target signal at a current operation beat from the first frequency, the second frequency, and the third frequency comprises:

4. A method of controlling a phase locked loop as claimed in claim 3, wherein said extracting the transient center frequency of the target signal by the quadrature signal generator to obtain the first frequency comprises:

5. The method of controlling a phase locked loop of claim 4, further comprising:

6. The method according to claim 5, wherein the determining the frequency compensation value of the target signal at the current running clock according to the low-pass filtered value comprises:

7. The method according to claim 5, wherein the determining the frequency compensation value of the target signal at the current running clock according to the low-pass filtered value comprises:

8. A control device of a phase locked loop, comprising:

9. A control apparatus of a phase locked loop, comprising:

a memory for storing a computer program;

processor for implementing the steps of the control method of a phase locked loop as claimed in any one of claims 1 to 7 when executing said computer program.

10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the method of controlling a phase locked loop according to any of claims 1 to 7.