A carrier synchronization method, device, system, terminal equipment and storage medium

Abstract

The application provides a carrier synchronization method, device, system, terminal equipment and storage medium, the method comprises the following steps: monitoring the parallel loop current amplitude of the target loop; when the preset amplitude threshold is exceeded, the slave unit is controlled to change the frequency, so that the beat frequency is generated; the time information of the beat frequency is obtained and the carrier clock signal is set; the frequency of the slave unit is controlled to be the same as that of the master unit, so that the synchronization of the carrier between the master unit and the slave unit is realized. The application monitors the parallel loop current amplitude of the target loop, when the parallel loop current amplitude exceeds the preset amplitude threshold, it is determined that the generated loop current is over standard, at this time, the frequency of the slave unit is controlled to change, so that the loop current of the target loop generates the beat frequency, the carrier clock signal is set according to the time information of the beat frequency, so that the carrier clock signal is aligned; the frequency of the slave unit is restored, and the effective suppression of the loop current is realized on the basis of the carrier synchronization.

Description

Technical Field

[0001] This invention relates to the field of carrier signal processing, and more particularly to a carrier synchronization method, apparatus, system, terminal device, and storage medium. Background Technology

[0002] Pulse width modulation (PWM) is a classic modulation technique widely used in applications such as LED brightness adjustment and AC / DC power conversion in power electronics. A classic PWM pulse waveform is generated by comparing a carrier wave and a modulating wave. The carrier wave is typically a triangular wave with a frequency of fs, primarily generated internally by the microprocessor; the modulating wave is a waveform equivalent to the desired output signal, usually an external input. A series of pulses of varying widths are filtered to obtain the desired smooth output signal. In some applications, there is a need to synchronize the carrier wave to achieve global synchronization control of parallel systems.

[0003] Currently, existing carrier synchronization methods connect two or more terminals to a host computer, which then sends a carrier clock signal to the terminals. However, this carrier synchronization scheme introduces circulating current between the terminals, affecting loop performance. Summary of the Invention

[0004] This invention application provides a carrier synchronization method, apparatus, system, terminal equipment, and storage medium to solve the technical problem of how to suppress commutation, thereby improving the performance of the loop.

[0005] To address the aforementioned technical problems, this invention provides a carrier synchronization method applied to a host unit, the carrier synchronization method comprising:

[0006] Monitor the amplitude of the parallel circulating current in the target loop;

[0007] When the amplitude of the parallel circulating current exceeds a preset amplitude threshold, the slave unit is controlled to change its frequency so that the circulating current of the target circuit generates a beat frequency;

[0008] The timing information of the beat frequency is acquired; and the carrier clock signal is set according to the timing information of the beat frequency; the slave unit is controlled to change its frequency so that the frequency of the slave unit is the same as the frequency of the master unit, thereby realizing the synchronization of the carrier between the master unit and the slave unit.

[0009] As a preferred embodiment, the step of acquiring the beat frequency time information and setting the carrier clock signal according to the beat frequency time information includes:

[0010] Obtain the envelope of the beat frequency;

[0011] Based on the envelope of the beat frequency, the time of the maximum value of the envelope is obtained;

[0012] The carrier clock signal is set using the time of the maximum point as the reference time.

[0013] As a preferred embodiment, obtaining the envelope of the beat frequency includes:

[0014] The frequency of the host unit and the frequency of the slave unit when the beat frequency is generated are obtained;

[0015] The beat frequency is obtained by the absolute value of the difference between the frequency of the host unit and the frequency of the slave unit when the beat frequency is generated;

[0016] The envelope of the beat frequency is obtained from the beat frequency.

[0017] As a preferred embodiment, the step of analyzing the envelope of the beat frequency to obtain the time of the maximum value of the envelope amplitude includes:

[0018] When the signals of the master unit and the slave unit are in phase, the time at which the maximum value of the envelope amplitude is obtained is determined.

[0019] As a preferred embodiment, the monitoring of the parallel circulating current amplitude in the target circuit includes:

[0020] In the target circuit, a first current on the equivalent line impedance of the slave unit and a second current on the equivalent line impedance of the master unit are sampled.

[0021] Obtain the difference between the first current and the second current, and obtain the absolute value of the difference;

[0022] Half of the absolute value is determined as the amplitude of the parallel circulation.

[0023] As a preferred embodiment, the host unit includes a pulse width modulation signal generator and a circuit to be controlled; the pulse width modulation signal generator is used to generate a pulse width modulation signal based on a comparison between a carrier wave and a modulated wave.

[0024] Accordingly, this invention application also provides a carrier synchronization device, including a monitoring module, a frequency adjustment module, and a synchronization module; wherein,

[0025] The monitoring module is used to monitor the amplitude of the parallel circulating current in the target circuit;

[0026] The frequency adjustment module is used to control the slave unit to change the frequency when the amplitude of the parallel circulating current exceeds a preset amplitude threshold, so that the circulating current of the target circuit generates a beat frequency.

[0027] The synchronization module is used to acquire the beat frequency time information; and set the carrier clock signal according to the beat frequency time information; control the slave unit to change the frequency so that the frequency of the slave unit is the same as the frequency of the master unit, thereby realizing the synchronization of the carrier between the master unit and the slave unit.

[0028] As a preferred embodiment, the synchronization module acquires the beat frequency time information; and sets the carrier clock signal according to the beat frequency time information, including:

[0029] The synchronization module acquires the envelope of the beat frequency;

[0030] Based on the envelope of the beat frequency, the time of the maximum value of the envelope is obtained;

[0031] The carrier clock signal is set using the time of the maximum point as the reference time.

[0032] As a preferred embodiment, the synchronization module acquires the envelope of the beat frequency, including:

[0033] The synchronization module acquires the frequency of the host unit and the frequency of the slave unit when the beat frequency is generated;

[0034] The beat frequency is obtained by the absolute value of the difference between the frequency of the host unit and the frequency of the slave unit when the beat frequency is generated;

[0035] The envelope of the beat frequency is obtained from the beat frequency.

[0036] As a preferred embodiment, the synchronization module analyzes the envelope of the beat frequency to obtain the time of the maximum value of the envelope amplitude, including:

[0037] The synchronization module obtains the time when the signal of the master unit and the signal of the slave unit are in phase.

[0038] As a preferred embodiment, the monitoring module monitors the amplitude of the parallel circulating current in the target circuit, including:

[0039] In the target circuit, the monitoring module samples a first current on the equivalent line impedance of the slave unit and a second current on the equivalent line impedance of the master unit.

[0040] Obtain the difference between the first current and the second current, and obtain the absolute value of the difference;

[0041] Half of the absolute value is determined as the amplitude of the parallel circulation.

[0042] As a preferred embodiment, the host unit includes a pulse width modulation signal generator and a circuit to be controlled; the pulse width modulation signal generator is used to generate a pulse width modulation signal based on a comparison between a carrier wave and a modulated wave.

[0043] Accordingly, this application also provides a carrier synchronization system, including a master unit and at least one slave unit, wherein the master unit is used to execute the carrier synchronization method described above, thereby realizing carrier synchronization between the master unit and the slave unit.

[0044] Accordingly, this application also provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the aforementioned carrier synchronization method.

[0045] Accordingly, this application also provides a computer-readable storage medium, the computer-readable storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to execute the carrier synchronization method.

[0046] Compared with the prior art, this invention application has the following beneficial effects:

[0047] This invention provides a carrier synchronization method, apparatus, system, terminal device, and storage medium. The carrier synchronization method includes: monitoring the amplitude of a parallel circulating current in a target circuit; when the amplitude of the parallel circulating current exceeds a preset amplitude threshold, controlling a slave unit to change its frequency to generate a beat frequency in the circulating current of the target circuit; acquiring the time information of the beat frequency; setting a carrier clock signal based on the time information of the beat frequency; and controlling the slave unit to change its frequency so that the frequency of the slave unit is the same as the frequency of the master unit, thereby achieving carrier synchronization between the master unit and the slave unit. This invention monitors the amplitude of the parallel circulating current in the target circuit. When the amplitude of the parallel circulating current exceeds a preset amplitude threshold, it determines that the generated circulating current exceeds the limit. At this time, it controls the slave unit to change its frequency to generate a beat frequency in the circulating current of the target circuit, sets the carrier clock signal based on the time information of the beat frequency to align the carrier clock signal, and restores the frequency of the slave unit to be the same as the frequency of the master unit, thus achieving effective suppression of the circulating current based on carrier synchronization. Attached Figure Description

[0048] Figure 1 : A schematic flowchart of an embodiment of the carrier synchronization method provided in this application.

[0049] Figure 2: A schematic diagram of an embodiment of the carrier synchronization system provided in this application.

[0050] Figure 3 : A schematic diagram of another embodiment of the carrier synchronization system provided in this application.

[0051] Figure 4 This is a schematic diagram of two power electronic circuit units connected in parallel, as provided in this invention application.

[0052] Figure 5 : This is a schematic diagram of the equivalent structure of the circulation generated by the present invention.

[0053] Figure 6 : A schematic diagram of the envelope of an embodiment of the beat frequency provided in this application.

[0054] Figure 7 : A schematic diagram of an embodiment of the carrier synchronization device provided in this application. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] Example 1

[0057] Please refer to Figure 1 , Figure 1 This is a flowchart illustrating an embodiment of the carrier synchronization method provided in this application.

[0058] like Figure 2 and 3 As shown, the carrier synchronization method described in this embodiment can be applied to a carrier synchronization system. Figure 2 A schematic diagram of an embodiment of the carrier synchronization system provided in this application is shown.

[0059] It is understood that a carrier synchronization system can have multiple terminals to be synchronized, such as A1, A2, ..., An. In some embodiments, A1 can be the master unit, and the rest can be slave units; in other embodiments, A3 can be the master unit, and the rest can be slave units. The selection of the master unit is determined according to the requirements of the application scenario. The difference between the master unit and the slave unit is that the master unit is the initiator of carrier synchronization.

[0060] like Figure 3As shown, in some preferred embodiments, the terminal may include a pulse width modulation signal generator (PWM generator shown in the figure) and a circuit to be controlled (main circuit shown in the figure); the pulse width modulation signal generator is used to generate a pulse width modulation signal based on a comparison between the carrier wave and the modulated wave.

[0061] The circuit to be controlled can be a light-emitting diode, a power electronic circuit, etc.

[0062] It is understandable that the pulse width modulation signal generator is used to control the circuit under control and to sample the physical quantities in the circuit under control in real time.

[0063] As described above, each terminal (master unit or slave unit) includes a pulse width modulation signal generator (PWM generator shown in the figure) and a circuit to be controlled (master circuit shown in the figure). Therefore, the carrier frequency (the triangular wave represented by the solid line in the figure, and the modulation wave represented by the dashed line) of each terminal is f... s1 f s2 , ..., f sn The frequencies fs mentioned above are generally triangular waves, which can be generated by a microprocessor in a pulse width modulation signal generator.

[0064] It is understood that the operating frequency of a microprocessor is generally on the order of megahertz, which is much higher than the kilohertz of the carrier frequency. Therefore, in this embodiment, the carrier synchronization is performed by a microprocessor, which can adjust the carrier phase more precisely and accurately, thereby optimizing the carrier synchronization effect.

[0065] Figure 1 The carrier synchronization method shown includes steps S101 to S103. Each step is described in detail below:

[0066] Step S101: Monitor the amplitude of the parallel circulating current in the target loop.

[0067] This embodiment provides an example of the circulating current generated in the target loop, such as... Figure 4 As shown in the figure, V1 and V2 can be two power electronic voltage sources, R S1 and R S2 These are the equivalent line impedances of the two voltage sources, R. L For load.

[0068] When the two power electronic voltage sources V1 and V2 are not perfectly synchronized, it is equivalent to the existence of an equivalent voltage source ΔV in the line, and the corresponding impedance is the line impedance R. S ,like Figure 5 As shown. At this time, in addition to the current flowing through the load, there will also be a circulating current I = ΔV / R between the two power electronic voltage sources V1 and V2. S .

[0069] Due to the line impedance R S Typically much smaller than the load R L Therefore, even a small difference between V1 and V2 can generate a large circulating current I. The synchronicity of V1 and V2 is determined by the carrier wave, so in addition to synchronizing the carrier wave, it is also necessary to eliminate the circulating current.

[0070] In some preferred embodiments, the magnitude of the parallel circulating current can be determined based on a first current on the equivalent line impedance of the slave unit and a second current on the equivalent line impedance of the master unit.

[0071] The monitoring of the parallel circulating current amplitude in the target circuit specifically includes: sampling a first current on the equivalent line impedance of the slave unit and a second current on the equivalent line impedance of the master unit in the target circuit; obtaining the difference between the first current and the second current, and obtaining the absolute value of the difference; and determining half of the absolute value as the parallel circulating current amplitude.

[0072] In this preferred embodiment, a current sensor can be used to obtain a first current on the equivalent line impedance of the slave unit and a second current on the equivalent line impedance of the master unit, for example, R corresponding to the example above. s1 and R s2 We get 1 / 2 × |R s1 -R s2 |As the amplitude of the parallel circulation.

[0073] By comparing the amplitude of the parallel circulating current with the preset amplitude threshold, it can be determined whether the circulating current in the loop exceeds the tolerable range, thereby determining whether to execute step S102 and perform subsequent steps of carrier synchronization.

[0074] Step S102: When the amplitude of the parallel circulating current exceeds a preset amplitude threshold, the slave unit is controlled to change its frequency so that the circulating current of the target circuit generates a beat frequency.

[0075] In this step, when it is determined that the amplitude of the parallel circulating current exceeds the tolerable range, the frequency of the slave unit is changed by n Hz (n is a real number), thereby causing the circulating current of the target circuit to generate a beat frequency.

[0076] In this embodiment, the so-called beat frequency phenomenon refers to the superposition of two excitation sources with similar frequencies (e.g., the master unit and the slave unit in this embodiment), which causes periodic fluctuations in the total amplitude of the waveform due to the similar frequencies.

[0077] Assuming the frequency of the excitation source, the master unit, is f1 and the frequency of the excitation source, the slave unit, is f2, then the beat frequency is the difference between the two frequencies, f1 and f2. beat =|f1-f2|.

[0078] It should be noted that this embodiment primarily addresses beat frequency generation for electrical signals (current), which is caused by frequency differences. This differs from the concept of beat frequency in optical signal processing. Due to the differences in the properties of optical signals, their beat frequency is caused by phase differences, not frequency differences. In fact, the technical solution based on electrical signals in this embodiment does not exhibit beat frequency phenomena when the frequency is the same but the phase is different.

[0079] Step S103: Obtain the beat frequency time information; and set the carrier clock signal according to the beat frequency time information; control the slave unit to change the frequency so that the frequency of the slave unit is the same as the frequency of the master unit, thereby realizing the carrier synchronization between the master unit and the slave unit.

[0080] In a preferred embodiment, such as Figure 6 As shown, the step of acquiring the beat frequency time information and setting the carrier clock signal according to the beat frequency time information includes: acquiring the envelope of the beat frequency; analyzing the envelope of the beat frequency to obtain the time of the maximum value of the envelope amplitude (e.g., ...). Figure 6 (The time marked by the dashed line shown); the time of the maximum point is used as the reference time to set the carrier clock signal.

[0081] Preferably, obtaining the envelope of the beat frequency includes: obtaining the frequency of the host unit and the frequency of the slave unit when the beat frequency is generated; obtaining the beat frequency based on the absolute value of the difference between the frequency of the host unit and the frequency of the slave unit when the beat frequency is generated; and obtaining the envelope of the beat frequency based on the beat frequency.

[0082] From the above, the beat frequency can be expressed as f beat =|f1-f2|, therefore, according to the beat frequency f beat The envelope that can form the beat frequency is as follows: Figure 6 As shown.

[0083] The amplitude threshold in this implementation can be represented as ΔI, which can be a preset value, specifically determined through testing and empirical values. When the amplitude of the parallel circulating current exceeds the preset amplitude threshold ΔI, a notification of circulating current exceeding the limit can be displayed, and the above step S103 can be executed.

[0084] Furthermore, the step of analyzing the envelope of the beat frequency to obtain the time of the maximum value of the envelope amplitude includes: obtaining the time of the maximum value of the envelope amplitude when the phase of the signal of the master unit and the signal of the slave unit are the same.

[0085] As can be seen from the above definition of the beat frequency of electrical signals, when the signals of the master unit and the slave unit are in phase, the two signals are superimposed, and the amplitude of the beat frequency envelope reaches its maximum value.

[0086] This embodiment can repeat the above steps multiple times. When the alignment time interval error is less than the preset time threshold Δt each time, the alignment time accuracy is considered to be up to standard, and the carrier signal synchronization is judged to be completed. The slave frequency is restored to be equal to the master frequency. At this time, the circulating current is effectively suppressed and is less than the preset amplitude threshold ΔI.

[0087] Then, carrier synchronization between the master unit and other slave units can be achieved by executing the carrier synchronization method of this embodiment multiple times (the multiple executions can be simultaneous or sequential). In some preferred embodiments, the terminals in the carrier synchronization system can be switched between master and slave units, and the switching conditions are set according to the specific requirements of the application scenario.

[0088] Correspondingly, such as Figure 7 As shown, this invention application also provides a carrier synchronization device 700, including a monitoring module 701, a frequency adjustment module 702, and a synchronization module 703; wherein,

[0089] The monitoring module 701 is used to monitor the amplitude of the parallel circulating current in the target circuit;

[0090] The frequency adjustment module 702 is used to control the slave unit to change the frequency when the amplitude of the parallel circulating current exceeds a preset amplitude threshold, so that the circulating current of the target circuit generates a beat frequency.

[0091] The synchronization module 703 is used to acquire the beat frequency time information; and set the carrier clock signal according to the beat frequency time information; and control the slave unit to change the frequency so that the frequency of the slave unit is the same as the frequency of the master unit, thereby realizing the synchronization of the carrier between the master unit and the slave unit.

[0092] As a preferred embodiment, the synchronization module 703 acquires the beat frequency time information; and sets the carrier clock signal according to the beat frequency time information, including:

[0093] The synchronization module 703 acquires the envelope of the beat frequency;

[0094] Based on the envelope of the beat frequency, the time of the maximum value of the envelope is obtained;

[0095] The carrier clock signal is set using the time of the maximum point as the reference time.

[0096] As a preferred embodiment, the synchronization module 703 acquires the envelope of the beat frequency, including:

[0097] The synchronization module 703 acquires the frequency of the host unit and the frequency of the slave unit when the beat frequency is generated;

[0098] The beat frequency is obtained by the absolute value of the difference between the frequency of the host unit and the frequency of the slave unit when the beat frequency is generated;

[0099] The envelope of the beat frequency is obtained from the beat frequency.

[0100] As a preferred embodiment, the synchronization module 703 analyzes the envelope of the beat frequency to obtain the time of the maximum value of the envelope amplitude, including:

[0101] The synchronization module 703 obtains the time when the signal of the master unit and the signal of the slave unit are in phase.

[0102] As a preferred embodiment, the monitoring module 701 monitors the amplitude of the parallel circulating current in the target circuit, including:

[0103] In the target circuit, the monitoring module 701 samples the first current on the equivalent line impedance of the slave unit and the second current on the equivalent line impedance of the master unit.

[0104] Obtain the difference between the first current and the second current, and obtain the absolute value of the difference;

[0105] Half of the absolute value is determined as the amplitude of the parallel circulation.

[0106] As a preferred embodiment, the host unit includes a pulse width modulation signal generator and a circuit to be controlled; the pulse width modulation signal generator is used to generate a pulse width modulation signal based on a comparison between a carrier wave and a modulated wave.

[0107] Accordingly, this application also provides a carrier synchronization system, including a master unit and at least one slave unit, wherein the master unit is used to execute the carrier synchronization method described above, thereby realizing carrier synchronization between the master unit and the slave unit.

[0108] Accordingly, this application also provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the aforementioned carrier synchronization method.

[0109] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal, connecting various parts of the terminal via various interfaces and lines.

[0110] The memory can be used to store the computer program. The processor implements various functions of the terminal by running or executing the computer program stored in the memory and calling data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the mobile phone (such as audio data, phonebook, etc.). In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0111] Accordingly, this application also provides a computer-readable storage medium, the computer-readable storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to execute the carrier synchronization method.

[0112] Wherein, if the module integrated into the carrier synchronization device / terminal equipment is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, it can implement the steps of the various method embodiments described above. Wherein, the computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0113] Compared with the prior art, this invention application has the following beneficial effects:

[0114] This invention provides a carrier synchronization method, apparatus, system, terminal device, and storage medium. The carrier synchronization method includes: monitoring the amplitude of a parallel circulating current in a target circuit; when the amplitude of the parallel circulating current exceeds a preset amplitude threshold, controlling a slave unit to change its frequency to generate a beat frequency in the circulating current of the target circuit; acquiring the time information of the beat frequency; setting a carrier clock signal based on the time information of the beat frequency; and controlling the slave unit to change its frequency so that the frequency of the slave unit is the same as the frequency of the master unit, thereby achieving carrier synchronization between the master unit and the slave unit. This invention monitors the amplitude of the parallel circulating current in the target circuit. When the amplitude of the parallel circulating current exceeds a preset amplitude threshold, it determines that the generated circulating current exceeds the limit. At this time, it controls the slave unit to change its frequency to generate a beat frequency in the circulating current of the target circuit, sets the carrier clock signal based on the time information of the beat frequency to align the carrier clock signal, and restores the frequency of the slave unit to be the same as the frequency of the master unit, thus achieving effective suppression of the circulating current based on carrier synchronization.

[0115] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A carrier synchronization method, characterized in that, Applied to a host unit, the carrier synchronization method includes: Monitor the amplitude of the parallel circulating current in the target loop; When the amplitude of the parallel circulating current exceeds a preset amplitude threshold, the slave unit is controlled to change its frequency so that the circulating current of the target circuit generates a beat frequency. The timing information of the beat frequency is obtained; and the carrier clock signal is set according to the timing information of the beat frequency; the slave unit is controlled to change its frequency so that the frequency of the slave unit is the same as the frequency of the master unit, thereby realizing the synchronization of the carrier between the master unit and the slave unit; The step of acquiring the beat frequency time information and setting the carrier clock signal according to the beat frequency time information includes: Obtain the envelope of the beat frequency; Based on the envelope of the beat frequency, the time of the maximum value of the envelope is obtained; The carrier clock signal is set using the time of the maximum point as the reference time. The step of analyzing the envelope of the beat frequency to obtain the time of the maximum value of the envelope amplitude includes: When the signals of the master unit and the slave unit are in phase, the time at which the maximum value of the envelope amplitude is obtained is determined.

2. The carrier synchronization method as described in claim 1, characterized in that, The step of obtaining the envelope of the beat frequency includes: The frequency of the host unit and the frequency of the slave unit when the beat frequency is generated are obtained; The beat frequency is obtained by the absolute value of the difference between the frequency of the host unit and the frequency of the slave unit when the beat frequency is generated; The envelope of the beat frequency is obtained from the beat frequency.

3. The carrier synchronization method as described in claim 1, characterized in that, The monitoring of the parallel circulating current amplitude in the target circuit includes: In the target circuit, a first current on the equivalent line impedance of the slave unit and a second current on the equivalent line impedance of the master unit are sampled. Obtain the difference between the first current and the second current, and obtain the absolute value of the difference; Half of the absolute value is determined as the amplitude of the parallel circulation.

4. A carrier synchronization method as described in any one of claims 1 to 3, characterized in that, The host unit includes a pulse width modulation signal generator and a circuit to be controlled; the pulse width modulation signal generator is used to generate a pulse width modulation signal based on a comparison between the carrier wave and the modulated wave.

5. A carrier synchronization device, characterized in that, The carrier synchronization method described in any one of claims 1 to 4 is adopted; The carrier synchronization device includes a monitoring module, a frequency adjustment module, and a synchronization module; wherein... The monitoring module is used to monitor the amplitude of the parallel circulating current in the target circuit; The frequency adjustment module is used to control the slave unit to change the frequency when the amplitude of the parallel circulating current exceeds a preset amplitude threshold, so that the circulating current of the target circuit generates a beat frequency. The synchronization module is used to acquire the beat frequency time information; and set the carrier clock signal according to the beat frequency time information; control the slave unit to change the frequency so that the frequency of the slave unit is the same as the frequency of the master unit, thereby realizing the synchronization of the carrier between the master unit and the slave unit.

6. A carrier synchronization system, characterized in that, It includes a master unit and at least one slave unit, wherein the master unit is used to perform the carrier synchronization method as described in any one of claims 1 to 4, thereby achieving carrier synchronization between the master unit and the slave unit.

7. A terminal device, characterized in that, It includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements a carrier synchronization method as described in any one of claims 1 to 4.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device on which the computer-readable storage medium is located to perform a carrier synchronization method as described in any one of claims 1 to 4.

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