Pulse discharge jet plasma stability control method and device and storage medium

Abstract

The embodiment of the application provides a pulse discharge jet plasma stability control method, device and storage medium, and belongs to the technical field of jet plasma control. The method comprises the following steps: in response to a control instruction, obtaining a discharge starting voltage and / or extinguishing voltage of a plasma generator corresponding to the control instruction through a pulse signal duty cycle and discharge voltage correlation curve; determining at least one pulse signal duty cycle corresponding to the control instruction according to the obtained discharge starting voltage and / or extinguishing voltage of the plasma generator; generating a corresponding first driving signal according to the obtained pulse signal duty cycle to drive the plasma generator; and the pulse signal duty cycle and discharge voltage correlation curve at least comprises different pulse signal duty cycles and corresponding discharge starting voltages and extinguishing voltages of the plasma generator. The application can maintain the discharge stability of the plasma generator without reducing the processing flux, increasing the cost and limiting the pulse discharge.

Description

Technical Field

[0001] This invention relates to the field of jet plasma control technology, specifically to a pulsed discharge jet plasma stability control method, a pulsed discharge jet plasma stability control device, and a computer-readable storage medium. Background Technology

[0002] Pulsed discharge jet plasma, due to its richer abundance of charged particles and higher reactivity, along with a macroscopic discharge region temperature close to room temperature, holds broad application prospects in fields such as material surface treatment, biomedicine, environmental remediation, energy and chemical engineering, sterilization and disinfection, and assisted combustion. In practical applications of pulsed discharge jet plasma, discharge stability is crucial, serving as a significant factor influencing the effectiveness of pulsed discharge and a fundamental condition for the development of related equipment. Currently, the main approaches to improving pulsed discharge stability involve reducing the discharge gap, lowering the discharge space pressure, or using inert gas atmospheres such as helium or argon. However, this significantly limits the practical application effects and scenarios of pulsed discharge. For example, while reducing the discharge gap improves discharge uniformity and stability, it hinders throughput and limits the size of processed items; lowering the discharge space pressure not only increases the cost of additional vacuum systems but also greatly restricts the application scenarios of pulsed discharge plasma. Summary of the Invention

[0003] The purpose of this invention is to provide a method for controlling the stability of pulsed discharge jet plasma, a device for controlling the stability of pulsed discharge jet plasma, and a computer-readable storage medium, so as to solve the problem that the prior art cannot improve discharge stability.

[0004] To achieve the above objectives, in a first aspect of the present invention, a method for controlling the stability of pulsed discharge jet plasma is provided, comprising:

[0005] In response to a control command, the discharge initiation voltage and / or extinction voltage of the plasma generator corresponding to the control command are obtained through a predetermined correlation curve between the pulse signal duty cycle and the discharge voltage. Based on the obtained discharge initiation voltage and / or extinction voltage of the plasma generator, at least one pulse signal duty cycle corresponding to the control command is determined.

[0006] The first driving signal is generated based on the duty cycle of the obtained pulse signal to drive the plasma generator.

[0007] The correlation curve between the pulse signal duty cycle and the discharge voltage includes at least different pulse signal duty cycles and their corresponding discharge initiation voltage and extinction voltage of the plasma generator.

[0008] Optionally, the method further includes: determining the correlation curve between the duty cycle of the pulse signal and the discharge voltage, including:

[0009] Determine the duty cycle of the initial pulse signal and the duty cycle of the final pulse signal;

[0010] The second driving signal is generated based on the duty cycle of the initial driving signal;

[0011] The plasma generator is driven by the second driving signal to obtain the discharge start voltage and extinction voltage of the plasma generator under the second driving signal;

[0012] The duty cycle of the initial pulse signal is adjusted according to a preset step size, and the above process is repeated until the current pulse signal duty cycle reaches the end pulse signal duty cycle. Based on all the obtained pulse signal duty cycles and their corresponding discharge start voltage and extinction voltage of the plasma generator, a correlation curve between pulse signal duty cycle and discharge voltage is generated.

[0013] Optionally, driving the plasma generator with the second driving signal and obtaining the discharge initiation voltage and extinction voltage of the plasma generator under the second driving signal includes:

[0014] The voltage peak value of the second driving signal is controlled to increase from the initial voltage peak value according to a preset growth curve until the plasma generator generates plasma, and the current voltage is used as the discharge start voltage of the plasma generator.

[0015] The peak voltage of the second driving signal is controlled to decrease according to a preset decrease curve until the plasma generator is extinguished, and the current voltage is used as the extinguishing voltage of the plasma generator.

[0016] Optionally, driving the plasma generator with the second driving signal and obtaining the discharge initiation voltage and extinction voltage of the plasma generator under the second driving signal includes:

[0017] The voltage peak value of the second driving signal is controlled to increase from the initial voltage peak value according to a preset growth curve until the plasma generator generates plasma, and the current voltage is used as the discharge start voltage of the plasma generator.

[0018] The peak voltage of the second driving signal is controlled to decrease according to a preset decrease curve until the plasma generator is extinguished, and the current voltage is used as the extinguishing voltage of the plasma generator.

[0019] The above process is repeated n times, and the average value of all obtained discharge initiation voltages is taken as the discharge initiation voltage of the plasma generator under the second driving signal, and the average value of all obtained extinction voltages is taken as the extinction voltage of the plasma generator under the second driving signal, where n≥2.

[0020] Optionally, the control command includes a start control command; obtaining the discharge initiation voltage and / or extinction voltage of the plasma generator corresponding to the control command through a predetermined pulse signal duty cycle and discharge voltage correlation curve, and determining at least one pulse signal duty cycle corresponding to the control command based on the obtained discharge initiation voltage and / or extinction voltage of the plasma generator, including:

[0021] The discharge initiation voltage with the smallest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is obtained by using a predetermined pulse signal duty cycle and discharge voltage correlation curve. The pulse signal duty cycle corresponding to the discharge initiation voltage with the smallest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is determined as the pulse signal duty cycle corresponding to the control command.

[0022] Optionally, the control command includes a shutdown control command; obtaining the discharge initiation voltage and / or shutdown voltage of the plasma generator corresponding to the control command through a predetermined pulse signal duty cycle versus discharge voltage correlation curve, and determining at least one pulse signal duty cycle corresponding to the control command based on the obtained discharge initiation voltage and / or shutdown voltage of the plasma generator, including:

[0023] The extinguishing voltage with the largest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is obtained by using a predetermined pulse signal duty cycle and discharge voltage correlation curve. The pulse signal duty cycle corresponding to the extinguishing voltage with the largest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is determined as the pulse signal duty cycle corresponding to the control command.

[0024] Optionally, the control commands include a start control command, a hold control command, and a shut-off control command; the discharge initiation voltage and / or shut-off voltage of the plasma generator corresponding to the control command are obtained through a predetermined pulse signal duty cycle and discharge voltage correlation curve; and at least one pulse signal duty cycle corresponding to the control command is determined based on the obtained discharge initiation voltage and / or shut-off voltage of the plasma generator, including:

[0025] The discharge initiation voltage with the smallest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is obtained by using a predetermined pulse signal duty cycle and discharge voltage correlation curve. The pulse signal duty cycle corresponding to the discharge initiation voltage with the smallest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is determined as the pulse signal duty cycle corresponding to the start control command.

[0026] The pulse signal duty cycle and discharge voltage correlation curve are obtained by obtaining all discharge initiation voltages and extinction voltages on the curve. Based on all discharge initiation voltages and extinction voltages, the pulse signal duty cycle range that can maintain the stable operation of the plasma generator is determined. One of the pulse signal duty cycle ranges that can maintain the stable operation of the plasma generator is taken as the pulse signal duty cycle corresponding to the holding control command.

[0027] The extinguishing voltage with the largest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is obtained by using a predetermined pulse signal duty cycle and discharge voltage correlation curve. The pulse signal duty cycle corresponding to the extinguishing voltage with the largest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is determined as the pulse signal duty cycle corresponding to the extinguishing control command.

[0028] Optionally, the pulse signal duty cycle range that can maintain stable operation of the plasma generator is determined based on all discharge initiation voltages and extinction voltages, including:

[0029] Calculate the voltage difference between the discharge initiation voltage and the extinction voltage corresponding to each pulse signal duty cycle. The interval formed by the pulse signal duty cycles corresponding to m consecutive voltage differences greater than the voltage difference threshold is taken as the pulse signal duty cycle interval that enables the plasma generator to operate stably.

[0030] In a second aspect of the present invention, a pulsed discharge jet plasma stability control device is provided, comprising:

[0031] The pulse signal duty cycle determination module is configured to, in response to a control command, obtain the discharge start voltage and / or extinction voltage of the plasma generator corresponding to the control command through a pre-determined correlation curve between the pulse signal duty cycle and the discharge voltage, and determine at least one pulse signal duty cycle corresponding to the control command based on the obtained discharge start voltage and / or extinction voltage of the plasma generator.

[0032] The control module is configured to generate a corresponding first drive signal based on the duty cycle of the obtained pulse signal to drive the plasma generator;

[0033] The correlation curve between the pulse signal duty cycle and the discharge voltage includes at least different pulse signal duty cycles and their corresponding discharge initiation voltage and extinction voltage of the plasma generator.

[0034] In a third aspect of the invention, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described pulsed discharge jet plasma stability control method.

[0035] In a fourth aspect of the invention, a terminal device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described pulsed discharge jet plasma stability control method.

[0036] The above-mentioned technical solution of the present invention constructs a correlation curve between the duty cycle of the pulse signal and the discharge voltage for different pulse signal duty cycles and the corresponding discharge start voltage and extinction voltage. This allows the corresponding pulse signal duty cycle to be automatically selected according to the control command to generate a drive signal to drive the plasma generator to produce plasma. This enables the plasma generator to dynamically adjust the duty cycle of the drive signal, thereby maintaining the discharge stability of the plasma generator without reducing the processing throughput, increasing costs, or limiting the application of pulsed discharge plasma.

[0037] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0038] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0039] Figure 1 This is a flowchart of a pulsed discharge jet plasma stability control method provided by a preferred embodiment of the present invention;

[0040] Figure 2 This is a curve showing the correlation between the pulse signal duty cycle and the discharge voltage, provided by a preferred embodiment of the present invention.

[0041] Figure 3 This is a schematic block diagram of a pulsed discharge jet plasma stability control device provided by a preferred embodiment of the present invention;

[0042] Figure 4 This is a schematic block diagram of a terminal device provided by a preferred embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures

[0044] 10 - Terminal device, 100 - Processor, 101 - Memory, 102 - Computer program. Detailed Implementation

[0045] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0046] like Figure 1 As shown, the first aspect of this embodiment provides a method for controlling the stability of pulsed discharge jet plasma, comprising:

[0047] In response to a control command, the discharge initiation voltage and / or extinction voltage of the plasma generator corresponding to the control command are obtained through a predetermined correlation curve between the pulse signal duty cycle and the discharge voltage. Based on the obtained discharge initiation voltage and / or extinction voltage of the plasma generator, at least one pulse signal duty cycle corresponding to the control command is determined.

[0048] The obtained pulse signal duty cycle is used to generate a corresponding first driving signal to drive the plasma generator; the correlation curve between the pulse signal duty cycle and the discharge voltage includes at least different pulse signal duty cycles and their corresponding discharge start voltage and extinction voltage of the plasma generator.

[0049] Thus, this embodiment constructs a correlation curve between the pulse signal duty cycle and the discharge voltage for different pulse signal duty cycles and corresponding discharge start voltages and extinction voltages. This allows the system to automatically select the corresponding pulse signal duty cycle according to control commands to generate a drive signal to drive the plasma generator to produce plasma. This enables the plasma generator to dynamically adjust the duty cycle of the drive signal, thereby maintaining the discharge stability of the plasma generator without reducing throughput, increasing costs, or limiting the application of pulsed discharge plasma.

[0050] Specifically, in the practical application of pulsed discharge jet plasma, discharge stability is crucial. Due to the complexity of discharge, many factors affect the stability of pulsed discharge jet plasma. To effectively control plasma stability under complex operating conditions, such as... Figure 2As shown, this embodiment pre-constructs a correlation curve between pulse signal duty cycle and discharge voltage, including different pulse signal duty cycles and their corresponding discharge initiation and extinction voltages of the plasma generator. In the correlation curve, the horizontal axis represents the pulse signal duty cycle, and the vertical axis represents the voltage. The pulse signal duty cycle is pre-divided into arbitrary values ​​within the range of 0 to 1. For each pulse signal duty cycle, there is a discharge initiation voltage and a extinction voltage. The discharge initiation voltage is the voltage at which the plasma generator begins to produce plasma, and the extinction voltage is the voltage at which the plasma generator stops producing plasma. The voltage region between the discharge initiation voltage and the extinction voltage corresponding to the same pulse signal duty cycle represents the driving signal voltage that can maintain stable discharge. Through the pre-constructed correlation curve between pulse signal duty cycle and discharge voltage, after receiving the control command, the stable discharge range of the plasma generator under different pulse signal duty cycles can be determined based on the discharge initiation voltage and the extinction voltage, thereby ensuring the discharge stability of the plasma generator. For example, if the control command requires the plasma generator to start quickly, it means that the discharge initiation voltage of the plasma generator should be as low as possible. Then, the discharge initiation voltage with the lowest voltage value is found from the correlation curve between the pulse signal duty cycle and the discharge voltage. The drive signal is generated using the pulse signal duty cycle corresponding to the discharge initiation voltage to drive the plasma generator to start.

[0051] The methods for determining the correlation curve between the pulse signal duty cycle and the discharge voltage include:

[0052] Determine the duty cycle of the initial pulse signal and the duty cycle of the final pulse signal;

[0053] The corresponding second drive signal is generated based on the duty cycle of the initial pulse signal;

[0054] The plasma generator is driven by the second driving signal, and the discharge start voltage and extinction voltage of the plasma generator under the second driving signal are obtained.

[0055] Adjust the duty cycle of the initial pulse signal according to the preset step size, and repeat the above process until the current pulse signal duty cycle reaches the end pulse signal duty cycle. Based on all the obtained pulse signal duty cycles and their corresponding discharge start voltage and extinction voltage of the plasma generator, generate a correlation curve between the pulse signal duty cycle and the discharge voltage.

[0056] This embodiment employs a pulse power supply with adjustable pulse signal duty cycle to drive a plasma generator, thereby obtaining discharge initiation and extinction voltages under different pulse signal duty cycle conditions. In a specific example of this embodiment, the initial pulse signal duty cycle is set to 5%, and the ending pulse signal duty cycle is set to 85%. With a preset adjustment step size of 5%, the adjustment is performed in 5% increments until the pulse signal duty cycle increases to 85%. This yields the discharge initiation and extinction voltages corresponding to each pulse signal duty cycle, generating a pulse signal duty cycle versus discharge voltage correlation curve that includes the pulse signal duty cycle versus initiation voltage curve and the extinction voltage correlation curve. The region between the initiation voltage and the extinction voltage is the stable discharge range.

[0057] In a specific example of this embodiment, the plasma generator is driven by a second driving signal, and the discharge initiation voltage and extinction voltage of the plasma generator under the second driving signal are obtained, including:

[0058] The voltage peak value of the second drive signal is controlled to start from the initial voltage peak value and increase the voltage peak value of the second drive signal according to the preset growth curve until the plasma generator generates plasma. The current voltage is used as the discharge start voltage of the plasma generator.

[0059] The peak voltage of the second drive signal is controlled to decrease according to a preset decrease curve until the plasma generator is extinguished, and the current voltage is used as the extinguishing voltage of the plasma generator.

[0060] Under each pulse signal duty cycle, the peak value of the control drive signal pulse voltage is gradually increased from 0 until the plasma generator starts to discharge and generate plasma, thus obtaining the discharge initiation voltage value under that pulse signal duty cycle. Then, the voltage is gradually decreased until the plasma generator is extinguished, thus obtaining the extinguishing voltage value under that pulse signal duty cycle. The above process is repeated to obtain the discharge initiation voltage and extinguishing voltage under each pulse signal duty cycle.

[0061] In another specific example of this embodiment, the plasma generator is driven by a second driving signal, and the discharge initiation voltage and extinction voltage of the plasma generator under the second driving signal are obtained, including:

[0062] The voltage peak value of the second drive signal is controlled to start from the initial voltage peak value and increase the voltage peak value of the second drive signal according to the preset growth curve until the plasma generator generates plasma. The current voltage is used as the discharge start voltage of the plasma generator.

[0063] The peak voltage of the second driving signal is controlled to decrease according to a preset decrease curve until the plasma generator is extinguished, and the current voltage is used as the extinguishing voltage of the plasma generator.

[0064] Repeat the above process n times, and take the average of all obtained discharge initiation voltages as the discharge initiation voltage of the plasma generator under the second drive signal, and take the average of all obtained extinction voltages as the extinction voltage of the plasma generator under the second drive signal.

[0065] For example, n can be 10, and the process is repeated 10 times to obtain 10 discharge initiation voltages and 10 extinction voltages under the duty cycle condition of the pulse signal. The average values ​​of the discharge initiation voltage and extinction voltage are calculated and used as the discharge initiation voltage and extinction voltage corresponding to the duty cycle of the pulse signal. After changing the duty cycle of the pulse signal by a step size of 5%, the process is repeated to obtain the discharge initiation voltage and extinction voltage curves corresponding to the duty cycle of the pulse signal from 5% to 85%.

[0066] In a specific example of this embodiment, the control command includes a start control command; obtaining the discharge initiation voltage and / or extinction voltage of the plasma generator corresponding to the control command through a predetermined pulse signal duty cycle and discharge voltage correlation curve; and determining at least one pulse signal duty cycle corresponding to the control command based on the obtained discharge initiation voltage and / or extinction voltage of the plasma generator, including:

[0067] The discharge initiation voltage with the minimum voltage value on the correlation curve between the pulse signal duty cycle and the discharge voltage is obtained by pre-determined correlation curve. The pulse signal duty cycle corresponding to the discharge initiation voltage with the minimum voltage value on the correlation curve is then determined as the pulse signal duty cycle corresponding to the control command.

[0068] Understandably, control commands can be combinations of multiple commands. For example, if the control commands include a start control command, and parsing the start control command yields a command that requires the plasma generator to start quickly, then the duty cycle of the pulse signal corresponding to the lowest discharge initiation voltage needs to be used as the duty cycle of the drive signal. Figure 2 As shown, the duty cycle of the pulse signal at around 70% can be selected as the duty cycle of the drive signal.

[0069] In another specific example of this embodiment, the control command includes an extinction control command; the discharge initiation voltage and / or extinction voltage of the plasma generator corresponding to the control command are obtained through a predetermined pulse signal duty cycle and discharge voltage correlation curve; and at least one pulse signal duty cycle corresponding to the control command is determined based on the obtained discharge initiation voltage and / or extinction voltage of the plasma generator, including:

[0070] The extinguishing voltage with the largest voltage value on the correlation curve between the pulse signal duty cycle and the discharge voltage is obtained by pre-determined correlation curve. The pulse signal duty cycle corresponding to the extinguishing voltage with the largest voltage value on the correlation curve is determined as the pulse signal duty cycle corresponding to the control command.

[0071] For example, when the control command includes a shutdown control command, if the analysis of the shutdown control command indicates that the plasma generator needs to be shut down quickly, then the duty cycle of the pulse signal corresponding to the maximum shutdown voltage needs to be used as the duty cycle of the drive signal. Figure 2 As shown, the duty cycle of the pulse signal at approximately 5% or 85% can be selected as the duty cycle of the drive signal.

[0072] In another specific example of this embodiment, the control commands include a start control command, a hold control command, and a shut-off control command; the discharge initiation voltage and / or shut-off voltage of the plasma generator corresponding to the control commands are obtained through a predetermined pulse signal duty cycle and discharge voltage correlation curve; at least one pulse signal duty cycle corresponding to the control commands is determined based on the obtained discharge initiation voltage and / or shut-off voltage of the plasma generator, including:

[0073] The discharge initiation voltage with the minimum voltage value on the pulse signal duty cycle and discharge voltage correlation curve is obtained by using a predetermined pulse signal duty cycle and discharge voltage correlation curve. The pulse signal duty cycle corresponding to the discharge initiation voltage with the minimum voltage value on the pulse signal duty cycle and discharge voltage correlation curve is determined as the pulse signal duty cycle corresponding to the start control command.

[0074] The pulse signal duty cycle and discharge voltage correlation curve are obtained by obtaining all discharge initiation voltage and extinction voltage on the curve. Based on all discharge initiation voltage and extinction voltage, the pulse signal duty cycle range that can maintain the stable operation of the plasma generator is determined. One of the pulse signal duty cycle ranges that can maintain the stable operation of the plasma generator is taken as the pulse signal duty cycle corresponding to the control command.

[0075] The extinguishing voltage with the largest voltage value on the correlation curve between the pulse signal duty cycle and the discharge voltage is obtained by pre-determined correlation curve between pulse signal duty cycle and discharge voltage. The pulse signal duty cycle corresponding to the extinguishing voltage with the largest voltage value on the correlation curve is determined as the pulse signal duty cycle corresponding to the extinguishing control command.

[0076] The process of determining the pulse signal duty cycle interval that can maintain stable operation of the plasma generator based on all discharge initiation voltages and extinction voltages includes: calculating the voltage difference between the discharge initiation voltage and extinction voltage corresponding to each pulse signal duty cycle, and using the interval formed by the pulse signal duty cycles corresponding to m consecutive voltage difference values ​​greater than a voltage difference threshold as the pulse signal duty cycle interval that can ensure stable operation of the plasma generator. For example, as... Figure 2 As shown, if the voltage difference threshold is 0.2KV and m is 5, then the pulse signal duty cycle range that enables the plasma generator to operate stably is between 25% and 70%. In this embodiment, the pulse signal duty cycle corresponding to the lowest extinction voltage in the pulse signal duty cycle range that enables the plasma generator to operate stably can be used as the pulse signal duty cycle corresponding to the control command, such as a pulse signal duty cycle of 55%. In this embodiment, the pulse signal duty cycle corresponding to any extinction voltage in the pulse signal duty cycle range that enables the plasma generator to operate stably can also be used as the pulse signal duty cycle corresponding to the control command, for example, the pulse signal duty cycle can also be 50%.

[0077] When the control command includes start control command, hold control command, and shut-down control command simultaneously, if parsing the control command reveals that it indicates the need for the plasma generator to start up quickly, shut down quickly, and maintain stable operation without shutting down, then the duty cycle of the pulse signal corresponding to the lowest discharge initiation voltage should be used as the duty cycle of the drive signal. Figure 2 As shown, the duty cycle of the pulse signal at approximately 70% can be selected as the duty cycle of the drive signal; simultaneously, the duty cycle of the pulse signal corresponding to the maximum value of the extinction voltage should be used as the duty cycle of the drive signal, as shown below. Figure 2As shown, the duty cycle of the pulse signal at approximately 5% or 85% can be selected as the duty cycle of the drive signal. In addition, to maintain the stable operation of the plasma generator, it is necessary to obtain the pulse signal duty cycle range that enables the plasma generator to operate stably, and determine the pulse signal duty cycle corresponding to the lowest extinction voltage in this range as the pulse signal duty cycle corresponding to the control command, such as 55%. Alternatively, the pulse signal duty cycle corresponding to any extinction voltage in this range can be used as the pulse signal duty cycle corresponding to the control command, such as 50%. This is not limited here. Upon receiving the control command, a drive signal is first generated with a pulse signal duty cycle of 70% to drive the plasma generator to start quickly. After the plasma generator starts, the pulse signal duty cycle of the drive signal is adjusted to 50% to maintain the stable operation of the plasma generator. When the running time is reached or the shutdown conditions are met, the pulse signal duty cycle of the drive signal is adjusted to 85% to control the plasma generator to shut down quickly. This achieves dynamic drive control of the plasma generator, maintaining the discharge stability of the plasma generator without reducing the processing throughput, increasing costs, or limiting the application of pulsed discharge plasma.

[0078] like Figure 3 As shown, in a second aspect of the present invention, a pulsed discharge jet plasma stability control device is provided, comprising:

[0079] The pulse signal duty cycle determination module is configured to, in response to a control command, obtain the discharge initiation voltage and / or extinction voltage of the plasma generator corresponding to the control command through a pre-determined correlation curve between the pulse signal duty cycle and the discharge voltage, and determine at least one pulse signal duty cycle corresponding to the control command based on the obtained discharge initiation voltage and / or extinction voltage of the plasma generator.

[0080] The control module is configured to generate a corresponding first drive signal based on the duty cycle of the obtained pulse signal to drive the plasma generator;

[0081] The correlation curve between pulse signal duty cycle and discharge voltage includes at least different pulse signal duty cycles and their corresponding discharge initiation voltage and extinction voltage of the plasma generator.

[0082] In a third aspect of the invention, a computer-readable storage medium is provided, which stores a computer program that, when executed by a processor, implements the above-described pulsed discharge jet plasma stability control method.

[0083] In a fourth aspect of the invention, a terminal device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described pulsed discharge jet plasma stability control method.

[0084] like Figure 4 The diagram shown is a schematic representation of a terminal device provided in an embodiment of the present invention. Figure 4 As shown, the terminal device 10 of this embodiment includes a processor 100, a memory 101, and a computer program 102 stored in the memory 101 and executable on the processor 100. When the processor 100 executes the computer program 102, it implements the steps in the above method embodiments. Alternatively, when the processor 100 executes the computer program 102, it implements the functions of each module / unit in the above device embodiments.

[0085] For example, computer program 102 can be divided into one or more modules / units, one or more of which are stored in memory 101 and executed by processor 100 to complete the present invention. One or more modules / units can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of computer program 102 in terminal device 10. For example, computer program 102 can be divided into a data acquisition module, a prediction module, and a control module.

[0086] Terminal device 10 may be a computing device such as a desktop computer, laptop, handheld computer, or cloud server. Terminal device 10 may include, but is not limited to, a processor 100 and a memory 101. Those skilled in the art will understand that... Figure 4 This is merely an example of terminal device 10 and does not constitute a limitation on terminal device 10. It may include more or fewer components than shown, or combine certain components, or different components. For example, terminal device may also include input / output devices, network access devices, buses, etc.

[0087] The processor 100 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. The general-purpose processor can be a microprocessor or any conventional processor.

[0088] The memory 101 can be an internal storage unit of the terminal device 10, such as a hard disk or RAM of the terminal device 10. The memory 101 can also be an external storage device of the terminal device 10, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the terminal device 10. Furthermore, the memory 101 can include both internal and external storage units of the terminal device 10. The memory 101 is used to store computer programs and other programs and data required by the terminal device 10. The memory 101 can also be used to temporarily store data that has been output or will be output.

[0089] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0090] In summary, this embodiment uses a pulse power supply with adjustable pulse duty cycle to drive the plasma generator to obtain discharge initiation voltage and extinction voltage under different duty cycle conditions. Based on the difference between the initiation voltage and the extinction voltage, the stable discharge holding range of the plasma generator under different pulse voltage ratios is determined. Thus, the pulse duty cycle for starting the initial discharge of the plasma generator, the pulse duty cycle for stable operation of the plasma generator, and the pulse duty cycle for shutting down the plasma generator can be adjusted according to the distribution of discharge initiation voltage, extinction voltage, and stable discharge holding range, thereby achieving the control of the stability of the pulsed discharge jet plasma.

[0091] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0092] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0093] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, portable hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0094] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, and should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A method for controlling the stability of pulsed discharge jet plasma, characterized in that, include: In response to a control command, the discharge initiation voltage and / or extinction voltage of the plasma generator corresponding to the control command are obtained through a predetermined correlation curve between the pulse signal duty cycle and the discharge voltage. Based on the obtained discharge initiation voltage and / or extinction voltage of the plasma generator, at least one pulse signal duty cycle corresponding to the control command is determined. The first driving signal is generated based on the duty cycle of the obtained pulse signal to drive the plasma generator. The correlation curve between the pulse signal duty cycle and the discharge voltage includes at least different pulse signal duty cycles and their corresponding discharge initiation voltage and extinction voltage of the plasma generator.

2. The pulsed discharge jet plasma stability control method according to claim 1, characterized in that, The method further includes: determining the correlation curve between the duty cycle of the pulse signal and the discharge voltage, including: Determine the duty cycle of the initial pulse signal and the duty cycle of the final pulse signal; The second driving signal is generated based on the duty cycle of the initial pulse signal; The plasma generator is driven by the second driving signal to obtain the discharge start voltage and extinction voltage of the plasma generator under the second driving signal; The duty cycle of the initial pulse signal is adjusted according to a preset step size, and the above process is repeated until the current pulse signal duty cycle reaches the end pulse signal duty cycle. Based on all the obtained pulse signal duty cycles and their corresponding discharge start voltage and extinction voltage of the plasma generator, a correlation curve between pulse signal duty cycle and discharge voltage is generated.

3. The pulsed discharge jet plasma stability control method according to claim 2, characterized in that, The plasma generator is driven by the second driving signal, and the discharge initiation voltage and extinction voltage of the plasma generator under the second driving signal are obtained, including: The voltage peak value of the second driving signal is controlled to increase from the initial voltage peak value according to a preset growth curve until the plasma generator generates plasma, and the current voltage is used as the discharge start voltage of the plasma generator. The peak voltage of the second driving signal is controlled to decrease according to a preset decrease curve until the plasma generator is extinguished, and the current voltage is used as the extinguishing voltage of the plasma generator.

4. The method for controlling the stability of pulsed discharge jet plasma according to claim 2, characterized in that, The plasma generator is driven by the second driving signal, and the discharge initiation voltage and extinction voltage of the plasma generator under the second driving signal are obtained, including: The voltage peak value of the second driving signal is controlled to increase from the initial voltage peak value according to a preset growth curve until the plasma generator generates plasma, and the current voltage is used as the discharge start voltage of the plasma generator. The peak voltage of the second driving signal is controlled to decrease according to a preset decrease curve until the plasma generator is extinguished, and the current voltage is used as the extinguishing voltage of the plasma generator. The above process is repeated n times, and the average value of all obtained discharge initiation voltages is taken as the discharge initiation voltage of the plasma generator under the second driving signal, and the average value of all obtained extinction voltages is taken as the extinction voltage of the plasma generator under the second driving signal, where n≥2.

5. The pulsed discharge jet plasma stability control method according to claim 1, characterized in that, The control commands include a start control command; obtaining the discharge initiation voltage and / or extinction voltage of the plasma generator corresponding to the control command through a predetermined pulse signal duty cycle and discharge voltage correlation curve, and determining at least one pulse signal duty cycle corresponding to the control command based on the obtained discharge initiation voltage and / or extinction voltage of the plasma generator, including: The discharge initiation voltage with the smallest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is obtained by using a predetermined pulse signal duty cycle and discharge voltage correlation curve. The pulse signal duty cycle corresponding to the discharge initiation voltage with the smallest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is determined as the pulse signal duty cycle corresponding to the control command.

6. The method for controlling the stability of pulsed discharge jet plasma according to claim 1, characterized in that, The control command includes an extinction control command; the discharge initiation voltage and / or extinction voltage of the plasma generator corresponding to the control command are obtained through a predetermined pulse signal duty cycle and discharge voltage correlation curve; and at least one pulse signal duty cycle corresponding to the control command is determined based on the obtained discharge initiation voltage and / or extinction voltage of the plasma generator, including: The extinguishing voltage with the largest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is obtained by using a predetermined pulse signal duty cycle and discharge voltage correlation curve. The pulse signal duty cycle corresponding to the extinguishing voltage with the largest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is determined as the pulse signal duty cycle corresponding to the control command.

7. The method for controlling the stability of pulsed discharge jet plasma according to claim 1, characterized in that, The control commands include start control commands, hold control commands, and extinguish control commands; the discharge initiation voltage and / or extinguishing voltage of the plasma generator corresponding to the control commands are obtained through a predetermined pulse signal duty cycle and discharge voltage correlation curve; at least one pulse signal duty cycle corresponding to the control commands is determined based on the obtained discharge initiation voltage and / or extinguishing voltage of the plasma generator, including: The discharge initiation voltage with the smallest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is obtained by using a predetermined pulse signal duty cycle and discharge voltage correlation curve. The pulse signal duty cycle corresponding to the discharge initiation voltage with the smallest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is determined as the pulse signal duty cycle corresponding to the start control command. The pulse signal duty cycle and discharge voltage correlation curve are obtained by obtaining all discharge initiation voltages and extinction voltages on the curve. Based on all discharge initiation voltages and extinction voltages, the pulse signal duty cycle range that can maintain the stable operation of the plasma generator is determined. One of the pulse signal duty cycle ranges that can maintain the stable operation of the plasma generator is taken as the pulse signal duty cycle corresponding to the holding control command. The extinguishing voltage with the largest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is obtained by using a predetermined pulse signal duty cycle and discharge voltage correlation curve. The pulse signal duty cycle corresponding to the extinguishing voltage with the largest voltage value on the pulse signal duty cycle and discharge voltage correlation curve is determined as the pulse signal duty cycle corresponding to the extinguishing control command.

8. The pulsed discharge jet plasma stability control method according to claim 7, characterized in that, Based on all discharge initiation and extinction voltages, the pulse signal duty cycle range that can maintain stable operation of the plasma generator is determined, including: Calculate the voltage difference between the discharge initiation voltage and the extinction voltage corresponding to each pulse signal duty cycle. The interval formed by the pulse signal duty cycles corresponding to m consecutive voltage differences greater than the voltage difference threshold is taken as the pulse signal duty cycle interval that enables the plasma generator to operate stably.

9. A pulsed discharge jet plasma stability control device, characterized in that, include: The pulse signal duty cycle determination module is configured to, in response to a control command, obtain the discharge start voltage and / or extinction voltage of the plasma generator corresponding to the control command through a pre-determined correlation curve between the pulse signal duty cycle and the discharge voltage, and determine at least one pulse signal duty cycle corresponding to the control command based on the obtained discharge start voltage and / or extinction voltage of the plasma generator. The control module is configured to generate a corresponding first drive signal based on the duty cycle of the obtained pulse signal to drive the plasma generator; The correlation curve between the pulse signal duty cycle and the discharge voltage includes at least different pulse signal duty cycles and their corresponding discharge initiation voltage and extinction voltage of the plasma generator.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the pulsed discharge jet plasma stability control method according to any one of claims 1 to 8.

11. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the pulsed discharge jet plasma stability control method according to any one of claims 1 to 8.

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