Method and apparatus for controlling glow discharge device, glow discharge device, and medium

Abstract

The present application relates to the technical field of glow discharge, and discloses a glow discharge equipment control method and device, a glow discharge equipment and a medium. The initial duty ratio and the basic frequency of the pulse width modulation driving signal of the glow discharge component are determined. During the working process of the pulse width modulation driving signal driving the glow discharge component, in response to detecting that the discharge intensity of the glow discharge component changes, the dynamic adjustment mode of the initial duty ratio is determined based on the change of the discharge intensity. In the current working period of the glow discharge component, the initial duty ratio is adjusted according to the dynamic adjustment mode. Thus, the interference signals are dispersed, the working ability of the equipment in the electromagnetic interference environment is improved, the anti-interference ability is improved, the uniformity and efficiency of the glow discharge can be adaptively maintained, and the service life of the equipment is further prolonged.

Description

Technical Field

[0001] This invention relates to the field of glow discharge technology, specifically to glow discharge equipment control methods, devices, glow discharge equipment, and media. Background Technology

[0002] Due to its advantages such as not requiring vacuum equipment, high chemical activity, and low gas temperature, atmospheric pressure low-temperature plasma has been increasingly widely used in industrial production in recent years, such as ozone preparation, material surface modification, thin film deposition, disinfection and sterilization, waste gas treatment, and high-power laser development. However, due to the difference in equivalent capacitance of glow discharge modules under different operating conditions, electromagnetic interference, and noise interference during the operation of glow discharge modules, abnormal operation or even damage to glow discharge modules may occur. Summary of the Invention

[0003] This invention provides a method, apparatus, device, and medium for controlling glow discharge equipment, in order to solve the problem of interference in glow discharge causing abnormal operation or even damage.

[0004] In a first aspect, the present invention provides a control method for a glow discharge device, applied to a glow discharge device comprising: a glow discharge component, the method comprising: Determine the fundamental frequency and initial duty cycle of the pulse width modulation drive signal for the glow discharge component; During the operation of the glow discharge component driven by the pulse width modulation drive signal, in response to the detection of a change in the discharge intensity of the glow discharge component, the dynamic adjustment mode of the initial duty cycle is determined based on the change in discharge intensity. During the current operating cycle of the glow discharge module, the initial duty cycle is adjusted dynamically.

[0005] This invention uses the fundamental frequency and initial duty cycle of the pulse width modulation drive signal of the glow discharge component as reference parameters. During equipment operation, it continuously monitors the actual changes in discharge intensity. When a change in discharge intensity is detected, the initial duty cycle is adjusted according to the specific changes in discharge intensity, thereby determining a dynamic adjustment method for the initial duty cycle. This adjustment is immediately executed within the current working cycle, ensuring that the duty cycle matches the changes in discharge intensity in real time. By dynamically adjusting and compensating for interference during glow discharge, the discharge state is quickly restored to a stable range, effectively dispersing interference signals. This improves the equipment's working ability in environments with electromagnetic interference and enhances its anti-interference capability. It can adaptively maintain the uniformity and efficiency of glow discharge, thereby further extending the equipment's lifespan.

[0006] In one optional implementation, the dynamic adjustment method for the initial duty cycle is determined based on changes in discharge intensity, including: When the discharge intensity increases, the dynamic adjustment method is determined to be to execute the first adjustment stage in the first half of the current working cycle and the second adjustment stage in the second half of the current working cycle. In the first adjustment stage, the duty cycle is first decreased and then increased to restore the initial duty cycle. In the second adjustment stage, the duty cycle is first increased and then decreased to restore the initial duty cycle. When the discharge intensity decreases, the dynamic adjustment method is determined to be to execute the second adjustment stage in the first half of the current working cycle and the first adjustment stage in the second half of the current working cycle.

[0007] This invention employs different adjustment methods to dynamically adjust the initial duty cycle when the discharge intensity increases and decreases, which can actively suppress discharge fluctuations caused by interference signals and avoid new changes brought about by sudden changes in the duty cycle. By alternating positive and negative adjustments within the cycle, it avoids over-adjustment or under-adjustment caused by unilateral adjustment, thereby reducing interference and balancing the discharge quantity, thus improving the anti-interference capability and discharge stability of the glow discharge equipment in a strong electromagnetic interference environment.

[0008] In one optional implementation, determining the dynamic adjustment method of the initial duty cycle based on changes in discharge intensity further includes: Obtain the current operating voltage of the glow discharge component; The single duty cycle adjustment amount for the first and second adjustment stages is determined based on the current operating voltage. The duty cycle adjustment methods for the first and second adjustment stages are determined based on the single duty cycle adjustment amount and the preset total duty cycle adjustment amount.

[0009] This invention first acquires the current operating voltage of the glow discharge component, which reflects the real-time load status of the glow discharge device and signal fluctuations caused by external interference signal coupling. Based on the amplitude of the current operating voltage, it determines the single adjustment amount of the duty cycle in the first and second adjustment stages. Combined with the pre-set duty cycle adjustment amount, it determines the duty cycle adjustment method for each stage. Based on the current operating voltage, it adaptively adjusts the single duty cycle adjustment amount, so that the rate of change of the duty cycle is dynamically matched with the intensity of the interference signal. This avoids the introduction of new high-frequency interference due to excessively fast adjustment or the inability to suppress the original interference in time due to excessively slow adjustment. At the same time, combined with the preset total adjustment amount, it ensures that the duty cycle recovers to the initial value within each half-cycle. Thus, without generating stable deviations, it effectively controls the voltage peaks and drops caused by interference signals of different intensities, significantly improving the anti-interference capability and discharge stability of the glow discharge device in complex electromagnetic interference environments.

[0010] In one optional implementation, determining the single duty cycle adjustment amount for the first and second adjustment stages based on the current operating voltage includes: Calculate the voltage difference between the current operating voltage and the preset standard operating voltage; The single duty cycle adjustment amount is determined based on the voltage difference, and the single duty cycle adjustment amount is positively correlated with the voltage difference.

[0011] This invention determines the degree of voltage deviation caused by external interference signals by calculating the voltage difference, and determines the single duty cycle adjustment amount based on the magnitude of the voltage difference, making the single duty cycle adjustment amount positively correlated with the voltage. Thus, it adaptively adjusts the amplitude of each step of duty cycle adjustment according to the strength of the interference signal. A larger single adjustment amount can quickly compensate for the voltage deviation caused by interference and improve discharge stability, while a smaller single adjustment amount can avoid over-adjustment and the introduction of new high-frequency disturbances. This enables adaptive control of interference signals of different intensities, improves the anti-interference response of the glow discharge equipment, and achieves smooth and stable control of the adjustment process.

[0012] In one optional implementation, the duty cycle adjustment method for the first adjustment stage and the second adjustment stage is determined based on the single duty cycle adjustment amount and the preset total duty cycle adjustment amount, including: In the first adjustment phase, starting from the initial duty cycle, the duty cycle is gradually reduced by the single duty cycle adjustment amount until the total reduction of the duty cycle reaches the preset total duty cycle adjustment amount. Then, the duty cycle is gradually increased by the single duty cycle adjustment amount until the initial duty cycle is restored. In the second adjustment phase, starting from the initial duty cycle, the duty cycle is gradually increased according to the single duty cycle adjustment amount until the total increase in duty cycle reaches the preset total duty cycle adjustment amount. Then, the duty cycle is gradually decreased according to the single duty cycle adjustment amount until the initial duty cycle is restored.

[0013] When the discharge intensity increases, this invention first adjusts the duty cycle by gradually decreasing it from the initial duty cycle in the first adjustment stage until the cumulative decrease reaches the preset duty cycle adjustment amount. Then, it gradually increases the duty cycle back to the initial value by the same single adjustment amount. In the second adjustment stage, the duty cycle is first gradually increased to the preset adjustment amount, and then gradually decreased back to the initial value. This makes each step of the change smooth and controllable, giving the entire adjustment process a smooth control capability over the peak value of the interference signal, and significantly enhancing the working stability of the glow discharge equipment in complex electromagnetic interference environments.

[0014] In one alternative implementation, determining the fundamental frequency of the pulse width modulation drive signal for the glow discharge component includes: A pulse width modulation drive signal is applied to the glow discharge component, and the first and second voltage zero-crossing points of the glow discharge component are collected within a preset time. The discharge half-cycle of the glow discharge module is determined based on the first and second voltage zero-crossing points. The fundamental frequency is determined based on the discharge half-cycle.

[0015] This invention first applies a pulse width modulation drive signal to the glow discharge component, then collects two consecutive zero-crossing points of the voltage of the glow discharge component within a preset time. The time interval between the zero-crossing points is the discharge half-cycle. Based on this discharge half-cycle, the fundamental frequency of the pulse width modulation drive signal is determined. By actually collecting two consecutive zero-crossing points and calculating the discharge half-cycle, the fundamental frequency can be determined, providing a basis for duty cycle adjustment and improving the working stability of the glow discharge equipment in an electromagnetic interference environment.

[0016] In one optional implementation, determining the initial duty cycle of the pulse width modulation drive signal for the glow discharge component includes: The initial duty cycle is determined based on the base frequency.

[0017] This invention improves the fixed-time characteristics of the fundamental frequency. Determining the initial duty cycle based on the fundamental frequency can better match the drive signal with the discharge load, thereby reducing additional interference caused by frequency deviation and improving the overall anti-interference capability and discharge consistency.

[0018] In a second aspect, the present invention provides a glow discharge device control apparatus, applied to a glow discharge device, the glow discharge device comprising: a glow discharge component, the apparatus comprising: The first determining module is used to determine the fundamental frequency and initial duty cycle of the pulse width modulation drive signal of the glow discharge component; The second determining module is used to determine the dynamic adjustment mode of the initial duty cycle based on the change in discharge intensity of the glow discharge component when the glow discharge component is driven by the pulse width modulation driving signal. The adjustment module is used to adjust the initial duty cycle of the glow discharge component in a dynamic manner during the current working cycle.

[0019] Thirdly, the present invention provides a glow discharge device, which includes a glow discharge component and a controller. The controller includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the method described in the first aspect or any of its corresponding embodiments.

[0020] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to perform the method described in the first aspect or any corresponding embodiment thereof. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a glow discharge device according to an embodiment of the present invention; Figure 2 This is a schematic flowchart of a first embodiment of a glow discharge device control method according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a second process for controlling a glow discharge device according to an embodiment of the present invention; Figure 4 This is a basic schematic diagram of a glow discharge high-voltage AC power supply according to an embodiment of the present invention; Figure 5 This is a frequency schematic diagram of a glow discharge component according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the first frequency adjustment of a glow discharge assembly according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a second frequency adjustment of a glow discharge assembly according to an embodiment of the present invention; Figure 8 This is a structural block diagram of a glow discharge device control apparatus according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the controller of the glow discharge device according to an embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0024] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] Figure 1 This is a schematic diagram of the structure of a glow discharge device. The glow discharge device includes a controller 101 and a glow discharge component 102. The controller 101 is used to execute the glow discharge device control method so that the glow discharge device can deodorize. For details of the overall process of the controller 101 executing the glow discharge device control method, please refer to the relevant description of the method embodiment below, which will not be repeated here.

[0027] In one alternative implementation, the glow discharge device is an air purifier.

[0028] Atmospheric pressure low-temperature plasma has been increasingly widely used in industrial production in recent years due to its advantages such as not requiring vacuum equipment, high chemical reactivity, and low gas temperature. Applications include ozone preparation, material surface modification, thin film deposition, disinfection, waste gas treatment, and the development of high-power lasers. Glow discharge is a type of atmospheric pressure low-temperature plasma, and it is characterized by its uniform discharge, lack of damage to material surfaces, and high efficiency.

[0029] The equivalent capacitance of the glow discharge module varies under different humidity, temperature and discharge intensity, which has a great impact on the frequency of the oscillation circuit of the high voltage AC power supply of the glow discharge module. The change of the resonant frequency will cause the electromagnetic interference frequency and noise frequency to change, which may lead to electromagnetic interference and noise interference, possibly causing abnormal operation or even damage to the glow discharge module.

[0030] Therefore, in order to solve the above technical problems, a glow discharge control scheme and logic for the discharge electrode were designed, and a basic frequency setting scheme for the high-voltage AC power supply was determined to ensure the normal operation of the high-voltage AC power supply. In addition, a frequency adjustment scheme at the basic frequency was designed to disperse the energy accumulation of the basic frequency, thereby reducing electromagnetic interference and noise interference.

[0031] According to an embodiment of the present invention, a method for controlling a glow discharge device is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0032] This embodiment provides a control method for a glow discharge device, which can be used in the controller of the aforementioned glow discharge device, such as the controller of an air purifier. Figure 2 This is a schematic flowchart of a first embodiment of a glow discharge device control method according to an embodiment of the present invention, as shown below. Figure 2 As shown, the process includes the following steps: Step S201: Determine the fundamental frequency and initial duty cycle of the pulse width modulation drive signal for the glow discharge component.

[0033] It should be noted that the pulse width modulation (PWM) drive signal is an electrical signal that controls the output voltage or power by changing the pulse width, i.e., the proportion of the high-level duration to the entire cycle. In glow discharge equipment, this signal is used to drive the glow discharge component, and the discharge intensity is controlled by adjusting the duty cycle to change the electrical energy applied to the discharge electrodes. This is beneficial for suppressing the influence of external interference on discharge stability by adjusting the timing and shape of the pulses.

[0034] The fundamental frequency is the number of cycles in which high and low levels repeat, and the duty cycle is the proportion of the high-level duration to the total cycle time within a complete signal cycle. The interference energy applied to the glow discharge component per unit time is controlled by the duty cycle, thereby adjusting the discharge intensity.

[0035] Step S202: During the operation of the glow discharge component driven by the pulse width modulation drive signal, in response to the detection of a change in the discharge intensity of the glow discharge component, the dynamic adjustment mode of the initial duty cycle is determined based on the change in discharge intensity.

[0036] Among them, the pulse width modulation drive signal is the pulse width modulation drive signal determined by the aforementioned fundamental frequency and initial duty cycle.

[0037] It should be noted that glow discharge is a self-sustaining discharge phenomenon generated by low-pressure gas under a high-voltage electric field. The core of it is that electrons collide with gas atoms to ionize them, while positive ions bombard the cathode to replenish electrons and maintain the discharge.

[0038] For example, the discharge intensity of a glow discharge component is usually manifested by changes in current magnitude, light intensity, or plasma density. If the high-voltage power supply provided to the electrodes is unstable, or is affected by changes in grid voltage or electromagnetic interference, the actual voltage amplitude or waveform applied between the electrodes will change, thus causing changes in discharge intensity. In this embodiment, taking the change in discharge intensity caused by electromagnetic interference and high-voltage interference as an example, the high-voltage interference and electromagnetic interference are reduced by dynamically adjusting the duty cycle.

[0039] Step S203: During the current working cycle of the glow discharge component, the initial duty cycle is adjusted according to the dynamic adjustment method.

[0040] The dynamic adjustment method can be to adjust the duty cycle within the current work cycle according to different adjustment ratios, or it can be to adjust it by gradually increasing and / or gradually decreasing.

[0041] The glow discharge device control method provided in this embodiment uses the fundamental frequency and initial duty cycle of the pulse width modulation drive signal of the glow discharge component as reference parameters. During device operation, it continuously monitors the actual changes in discharge intensity. When a change in discharge intensity is detected, the initial duty cycle is adjusted according to the specific changes in discharge intensity, thereby determining the dynamic adjustment mode for the initial duty cycle. This adjustment is immediately executed within the current working cycle, so that the duty cycle matches the changes in discharge intensity in real time. By dynamically adjusting and compensating for interference during glow discharge, the discharge state is quickly restored to a stable range, thereby dispersing interference signals, improving the device's working ability in environments with electromagnetic interference, and enhancing its anti-interference ability. It can adaptively maintain the uniformity and efficiency of glow discharge, thereby further extending the device's lifespan.

[0042] This embodiment provides a control method for a glow discharge device, which can be used in the controller of the aforementioned glow discharge device, such as the controller of an air purifier. Figure 3 This is a flowchart of a glow discharge device control method according to an embodiment of the present invention, such as... Figure 3 As shown, the process includes the following steps: Step S301: Determine the fundamental frequency and initial duty cycle of the pulse width modulation drive signal for the glow discharge component.

[0043] Specifically, step S301 includes: Step S3011: Apply a pulse width modulation drive signal to the glow discharge component and collect the first and second voltage zero crossing points of the glow discharge component within a preset time.

[0044] For example, at the first moment, the drive signal changes from low level to high level, and its waveform will rise step by step, then gradually decrease after reaching the peak, and drop to 0 at the second moment. At this time, the zero-crossing points at the first and second moments are collected by the zero-crossing sampling circuit. Step S3012: Determine the discharge half-cycle of the glow discharge component based on the first voltage zero-crossing point and the second voltage zero-crossing point.

[0045] For example, the time difference between the first moment and the second moment is calculated to determine the time of the oscillation half-cycle. Then the period T is: T=2(t2-t1), where t1 is the first moment and t2 is the second moment.

[0046] Step S3013: Determine the fundamental frequency based on the discharge half-cycle.

[0047] The fundamental frequency f0 is: f0 = 1 / (2(t2-t1)).

[0048] The glow discharge device control method provided in this embodiment first loads a pulse width modulation drive signal onto the glow discharge component, and then collects two consecutive voltage zero-crossing points of the glow discharge component within a preset time. The time interval between the voltage zero-crossing points is the discharge half-cycle. Based on this discharge half-cycle, the fundamental frequency of the pulse width modulation drive signal is determined. The fundamental frequency can be determined by actually collecting two consecutive zero-crossing points and calculating the discharge half-cycle, which provides a basis for duty cycle adjustment and improves the working stability of the glow discharge device in an electromagnetic interference environment.

[0049] Step S3014: Determine the initial duty cycle based on the base frequency.

[0050] In this embodiment, the initial duty cycle can be determined by the duration of the high level corresponding to the glow discharge component maintaining the fundamental frequency.

[0051] The adjustment amount for regulating the high-level duration was determined experimentally. When the adjustment starts from 10% of the period, the initial duty cycle is 10%T, where T = 1 / f0. The 10% adjustment is related to the accuracy of the duty cycle adjustment, and its accuracy is higher than that of a 20% adjustment.

[0052] The glow discharge device control method provided in this embodiment improves the fixed-time characteristics of the fundamental frequency. Determining the initial duty cycle based on the fundamental frequency can better match the drive signal with the discharge load, thereby reducing additional interference caused by frequency deviation and improving the overall anti-interference capability and discharge consistency.

[0053] Step S302: During the operation of the glow discharge component driven by the pulse width modulation drive signal, in response to the detection of a change in the discharge intensity of the glow discharge component, the dynamic adjustment mode of the initial duty cycle is determined based on the change in discharge intensity.

[0054] Specifically, step S302 includes: Step S3021: When the discharge intensity changes and the discharge intensity increases, the dynamic adjustment method is determined to be to execute the first adjustment stage in the first half of the current working cycle and the second adjustment stage in the second half of the current working cycle; the first adjustment stage is to first decrease the duty cycle and then increase it to restore the initial duty cycle, and the second adjustment stage is to first increase the duty cycle and then decrease it to restore the initial duty cycle.

[0055] It's important to note that the duty cycle is the proportion of the high-level duration to the total cycle. The duty cycle determines the length of the high-level signal within one cycle; a decreased duty cycle means a shorter high-level duration, while an increased duty cycle means a longer high-level duration. When the discharge intensity increases, the high-level duration is first reduced to suppress the increase, and then increased until the high-level duration corresponding to the initial duty cycle is restored. Therefore, the amount of decrease or increase in the duty cycle is related to the operating voltage, and the direction of duty cycle adjustment is related to the change in discharge intensity. The duty cycle corresponding to the current change in discharge intensity is determined by the operating voltage. In the second half of the cycle, the duty cycle is first increased and then decreased to restore it to the initial duty cycle. This is to compensate for the insufficient energy caused by the reduced duty cycle in the first half of the cycle, and to form a symmetrical adjustment to counteract the interference signal. The reduction of the duty cycle in the first half of the cycle is equivalent to temporarily reducing the discharge intensity to counteract the enhanced interference signal. However, this will reduce the average energy within half a cycle. Therefore, the duty cycle is increased in the second half of the cycle to compensate for the energy missing in the first half of the cycle, so that the total energy of the whole cycle is consistent with the initial duty cycle. Then, the duty cycle is reduced to restore it to the initial state to avoid energy offset. The order of increasing and then decreasing can produce an adjustment waveform opposite to that of the first half of the cycle, thereby suppressing the oscillation caused by the interference signal. This significantly improves the ability of glow discharge to suppress interference signals and the long-term operational stability of the equipment.

[0056] Step S3022: When the discharge intensity decreases, determine the dynamic adjustment method as follows: execute the second adjustment stage in the first half of the current working cycle and execute the first adjustment stage in the second half of the current working cycle.

[0057] It should be noted that a decrease in discharge intensity indicates the presence of interference signals that may cause a reduction in the discharge intensity of the glow discharge component. In this case, a second adjustment phase needs to be executed in the first half of the current working cycle. This involves first increasing the duty cycle and then decreasing it back to the initial value. This is to compensate for the lost energy by increasing the duration of the high-level signal when the discharge intensity decreases, thus offsetting the discharge loss caused by interference. The duty cycle is then decreased again to avoid overcompensation. Meanwhile, the first adjustment phase is executed in the second half of the cycle to suppress any energy overshoot that may exist in the first half of the cycle and to actively adapt to the dynamic fluctuations of the interference signal. This symmetrical adjustment method in the first and second halves of the cycle can quickly compensate for and restore energy balance in response to interference signals that reduce the discharge intensity. It effectively suppresses voltage drops caused by electromagnetic interference and avoids overcompensation or oscillation caused by unidirectional adjustment, thereby improving the responsiveness and operational stability of the glow discharge equipment when subjected to negative interference.

[0058] The glow discharge device control method provided in this embodiment dynamically adjusts the initial duty cycle using different adjustment methods when the discharge intensity increases and decreases. This actively suppresses discharge fluctuations caused by interference signals and avoids new changes caused by sudden changes in the duty cycle. By alternating positive and negative adjustments within the cycle, it avoids over-adjustment or under-adjustment caused by unilateral adjustment, thereby reducing interference and balancing the discharge quantity, thus improving the anti-interference capability and discharge stability of the glow discharge device in a strong electromagnetic interference environment.

[0059] Step S3023: Obtain the current operating voltage of the glow discharge component.

[0060] For example, a decrease in discharge intensity may mean that the current operating voltage is lower than the standard voltage value, while an increase in discharge intensity may mean that the current operating voltage is higher than the standard voltage value. That is, by obtaining the current operating voltage, the duty cycle adjustment amount can be determined based on the difference between the current operating voltage and the standard operating voltage. Step S3024: Determine the single duty cycle adjustment amount for the first and second adjustment stages based on the current operating voltage.

[0061] In some optional embodiments of this example, step S3024 includes: Step a1: Calculate the voltage difference between the current operating voltage and the preset standard operating voltage.

[0062] For example, when the discharge intensity decreases and causes the current operating voltage of the glow discharge component to be lower than the preset standard operating voltage, the voltage difference is negative; when the discharge intensity increases and causes the current operating voltage of the glow discharge component to be higher than the preset standard operating voltage, the voltage difference is positive.

[0063] Step a2: Determine the single duty cycle adjustment amount based on the voltage difference. The single duty cycle adjustment amount is positively correlated with the voltage difference.

[0064] The duty cycle adjustment amount is determined based on the absolute value of the voltage difference between the working voltage and the preset standard working voltage. That is, the larger the voltage difference, the larger the adjustment amount, and the smaller the voltage difference, the smaller the adjustment amount. The specific adjustment direction of the duty cycle is determined according to the change in discharge intensity.

[0065] The glow discharge device control method provided in this embodiment determines the degree of voltage deviation caused by external interference signals by calculating the voltage difference, and determines the single duty cycle adjustment amount based on the magnitude of the voltage difference, so that the single duty cycle adjustment amount is positively correlated with the voltage. Thus, the amplitude of each step of duty cycle adjustment is adaptively adjusted according to the strength of the interference signal. A larger single adjustment amount can quickly compensate for the voltage deviation caused by interference and improve discharge stability, while a smaller single adjustment amount can avoid over-adjustment and the introduction of new high-frequency disturbances. This achieves adaptive control of interference signals of different intensities, improves the anti-interference response of the glow discharge device, and achieves smooth and stable control of the adjustment process.

[0066] Step S3025: Determine the duty cycle adjustment method for the first adjustment stage and the second adjustment stage based on the single duty cycle adjustment amount and the preset total duty cycle adjustment amount.

[0067] In some optional embodiments of this example, step S3025 includes: Step b1: In the first adjustment phase, starting from the initial duty cycle, the duty cycle is gradually reduced by the single duty cycle adjustment amount until the total reduction of the duty cycle reaches the preset total duty cycle adjustment amount. Then, the duty cycle is gradually increased by the single duty cycle adjustment amount until the initial duty cycle is restored.

[0068] For example, a preset adjustment time difference value Δt is used. Generally, to ensure the normal operation of the system, Δt should not exceed 10% of the period T. That is, this 10% is determined based on the voltage difference. In this embodiment, 10% is used as an example. The first PWM drive cycle is T, and the high-level time is Ton. The next drive cycle is T, and the high-level time is reduced by 1, which is Ton-1. The next cycle is T, and the high-level time is Ton-2. ..., until the PWM high-level time is Ton-Δt. That is, the first adjustment stage starts from the initial duty cycle and gradually reduces the duty cycle according to the single duty cycle adjustment amount until the total reduction of the duty cycle reaches the preset total duty cycle adjustment amount.

[0069] Then, the next PWM cycle is T, and the high-level time is Ton-Δt+1; the next PWM cycle is T, and the high-level time is Ton-Δt+2; ... until the PWM high-level time is Ton; that is, the duty cycle is gradually increased according to the single duty cycle adjustment amount until the initial duty cycle is restored.

[0070] Step b2: In the second adjustment phase, starting from the initial duty cycle, the duty cycle is gradually increased by the single duty cycle adjustment amount until the total increase in duty cycle reaches the preset total duty cycle adjustment amount. Then, the duty cycle is gradually decreased by the single duty cycle adjustment amount until the initial duty cycle is restored.

[0071] For example, a preset adjustment time difference Δt is used. Generally, to ensure the normal operation of the system, Δt should not exceed 10% of the period T. The first PWM drive cycle is T, and the high-level time is Ton. The next drive cycle is T, and the high-level time is increased by 1, which is Ton+1. The next cycle is T, and the high-level time is Ton+2. ..., until the PWM high-level time is Ton+Δt. That is, starting from the initial duty cycle, the duty cycle is gradually increased according to the single duty cycle adjustment amount until the total increase in duty cycle reaches the preset total duty cycle adjustment amount.

[0072] Then, the next PWM cycle is T, and the high-level time is Ton + Δt - 1; the next PWM cycle is T, and the high-level time is Ton + Δt - 2; ... until the PWM high-level time is Ton; that is, the duty cycle is gradually reduced according to the single duty cycle adjustment amount until the initial duty cycle is restored.

[0073] The glow discharge device control method provided in this embodiment, when the discharge intensity increases, firstly, in the first adjustment stage, starts from the initial duty cycle and gradually decreases the duty cycle according to the single duty cycle adjustment amount until the cumulative decrease reaches the preset duty cycle adjustment amount. Then, the duty cycle is gradually increased back to the initial value with the same single adjustment amount. At the same time, in the second adjustment stage, the duty cycle is first gradually increased to reach the preset adjustment amount, and then gradually decreased back to the initial value. This makes each step of change smooth and controllable, and the entire adjustment process has the ability to smoothly control the peak value of the interference signal, significantly enhancing the working stability of the glow discharge device in complex electromagnetic interference environments.

[0074] The glow discharge device control method provided in this embodiment first obtains the current operating voltage of the glow discharge component, which reflects the real-time load status of the glow discharge device and the signal fluctuations caused by external interference signal coupling. Based on the amplitude of the current operating voltage, the single adjustment amount of the duty cycle in the first and second adjustment stages is determined. Combined with the preset duty cycle adjustment amount, the duty cycle adjustment mode of each stage is determined. The single duty cycle adjustment amount is adaptively adjusted based on the current operating voltage, so that the rate of change of the duty cycle is dynamically matched with the intensity of the interference signal. This avoids the introduction of new high-frequency interference due to excessively fast adjustment or the inability to suppress the original interference in time due to excessively slow adjustment. At the same time, combined with the preset total adjustment amount, the duty cycle is ensured to recover to the initial value within each half cycle. Thus, without generating stable deviations, the voltage peaks and drops caused by interference signals of different intensities are effectively controlled, significantly improving the anti-interference capability and discharge stability of the glow discharge device in complex electromagnetic interference environments.

[0075] Step S303: During the current duty cycle of the glow discharge module, the initial duty cycle is adjusted using a dynamic adjustment method. For details, please refer to [link to relevant documentation]. Figure 2 Step S203 of the illustrated embodiment will not be described again here.

[0076] The glow discharge device control method provided in this embodiment uses the fundamental frequency and initial duty cycle of the pulse width modulation drive signal of the glow discharge component as reference parameters. During device operation, it continuously monitors the actual changes in discharge intensity. When a change in discharge intensity is detected, the initial duty cycle is adjusted according to the specific changes in discharge intensity, thereby determining the dynamic adjustment mode for the initial duty cycle. This adjustment is immediately executed within the current working cycle, so that the duty cycle matches the changes in discharge intensity in real time. By dynamically adjusting and compensating for interference during glow discharge, the discharge state is quickly restored to a stable range, thereby effectively dispersing interference signals, improving the device's working ability in environments with electromagnetic interference, and enhancing its anti-interference capability. It can adaptively maintain the uniformity and efficiency of glow discharge, thereby further extending the device's lifespan.

[0077] Combination Figures 4 to 7 This describes an application embodiment of a glow discharge device control method, exemplarily. Figure 4 This is a basic schematic diagram of the high-voltage AC power supply for the glow discharge module. VDC is the supply voltage of the high-voltage AC power supply, T1 is a high-frequency step-up transformer, Q1 is a switching transistor, and R1 is a sampling resistor for the drain or source current of the switching transistor, which also provides a signal for the zero-crossing sampling circuit. R2 and C1 are the equivalent resistance and capacitance of the glow discharge module. The MCU controls the conduction or shutdown of Q1 through PWM.

[0078] The equivalent capacitance C1 of the glow module varies under different humidity, temperature and discharge intensity, which has a great impact on the frequency of the oscillation circuit of the high voltage AC power supply of the glow module. If the PWM drive frequency is not set properly, it will cause changes in the frequency of electromagnetic interference and noise, which may lead to electromagnetic interference and noise interference, possibly causing abnormal operation or even damage to the glow module.

[0079] For example, Figure 5 This is a frequency diagram of a glow discharge module. The steps for setting the base frequency are as follows: The reference waveform is shown on R1. At time t1, the PWM changes from low to high, turning on Q1. The waveform on R1 gradually rises, reaches its peak, and then gradually declines, reaching 0 at time t2. The MCU uses a zero-crossing sampling circuit to collect the zero-crossing points of t1 and t2, calculates the time difference between t1 and t2 as (t2-t1), and determines the time of the oscillation half-cycle. Therefore, the PWM period T is 2(t2-t1), and the fundamental frequency f0 = 1 / (2(t2-t1)). This configuration adapts to the oscillation frequency changes caused by the external environment, reduces electromagnetic interference and noise interference, and ensures the reliability of the glow discharge high-voltage AC power supply.

[0080] For example, when the same circuit is used to drive two types of glow modules, one potted and one unpotted, the equivalent capacitance values ​​of the two glow modules are very different. This is due to the change in oscillation frequency caused by the external environment.

[0081] For example, Figure 6 This is a schematic diagram of the first frequency adjustment method for a glow discharge module. Figure 7 This is a schematic diagram of the second frequency adjustment method for a glow discharge assembly.

[0082] High-voltage AC power is a major source of interference in EMC terminal disturbance voltage and power testing. Especially when operating at a fixed frequency f0, the interference energy concentrates at frequency f0 and its harmonics, which is extremely detrimental to national standard EMC testing. Therefore, this solution improves the PWM drive frequency. Details are as follows: Frequency adjustment first stage: Preset adjustment time difference Δt. Generally, to ensure normal system operation, Δt should not exceed 10% of the period T. The first PWM drive cycle is T, and the high-level time is Ton; the next drive cycle is T, and the high-level time is increased by 1, to Ton+1; the next cycle is T, and the high-level time is Ton+2; ..., until the PWM high-level time is Ton+Δt; Then, the next PWM cycle is T, and the high-level time is Ton + Δt - 1; the next PWM cycle is T, and the high-level time is Ton + Δt - 2; ... until the PWM high-level time is Ton.

[0083] For example, the first stage of frequency adjustment is initiated when the high-voltage circuit board is powered on. According to the PWM adjustment above, it has reached Ton+Δt. At this point, the high level of the previous adjustment cycle has been completed. The subsequent adjustment needs to reduce the high level time of the PWM wave, so the starting point is Ton+Δt-1, and it is decreased by 1 time point in sequence.

[0084] The second stage of frequency adjustment: a preset adjustment time difference Δt is used. Generally, to ensure the normal operation of the system, Δt should not exceed 10% of the period T. The first PWM drive cycle is T, and the high-level time is Ton; the next drive cycle is T, and the high-level time is reduced by 1, to Ton-1; the next cycle is T, and the high-level time is Ton-2; ..., until the PWM high-level time is Ton-Δt; Then, the next PWM cycle is T, and the high-level time is Ton-Δt+1; the next PWM cycle is T, and the high-level time is Ton-Δt+2; ... until the PWM high-level time is Ton; For example, when the first stage of adjustment is completely finished, the second stage of adjustment will begin. The end of the first stage of adjustment is marked by the high-level time of the PWM returning to Ton from Ton through sequential increments and decrements.

[0085] By employing the frequency adjustment scheme based on the fundamental frequency f0, interference energy is dispersed across different frequency points, significantly reducing electromagnetic interference and noise interference. Interference energy refers to the instability in output voltage caused by changes in the external environment, such as temperature and humidity variations, which lead to differences in the equivalent capacitance of the glow discharge module.

[0086] By adjusting the PWM drive frequency, the optimal high-level time of the PWM is found to best suit the current load conditions. The optimal high-level time allows the load to output the maximum voltage within a safe and reliable range to drive the glow module for high-voltage decomposition and sterilization, resulting in a very good deodorization effect.

[0087] This embodiment also provides a glow discharge device control apparatus for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0088] This embodiment provides a glow discharge equipment control device, such as... Figure 8 As shown, it includes: The first determining module 801 is used to determine the fundamental frequency and initial duty cycle of the pulse width modulation drive signal of the glow discharge component; The second determining module 802 is used to determine the dynamic adjustment mode of the initial duty cycle based on the change in discharge intensity of the glow discharge component when the glow discharge component is driven to work by the pulse width modulation driving signal. The adjustment module 803 is used to adjust the initial duty cycle of the glow discharge component in a dynamic adjustment manner during the current working cycle.

[0089] In some alternative implementations, the first determining module 801 includes: The acquisition unit is used to load a pulse width modulation drive signal onto the glow discharge component and acquire the first and second voltage zero-crossing points of the glow discharge component within a preset time.

[0090] The determining unit is used to determine the discharge half-cycle of the glow discharge component based on the first voltage zero-crossing point and the second voltage zero-crossing point.

[0091] The frequency determination unit is used to determine the fundamental frequency based on the discharge half-cycle.

[0092] The duty cycle determination unit is used to determine the initial duty cycle based on the base frequency.

[0093] In some alternative implementations, the second determining module 802 includes: The first adjustment mode determination unit is used to determine the dynamic adjustment mode when the discharge intensity changes and the discharge intensity increases. The first adjustment stage is executed in the first half of the current working cycle, and the second adjustment stage is executed in the second half of the current working cycle. The first adjustment stage is to first decrease the duty cycle and then increase it to restore the initial duty cycle. The second adjustment stage is to first increase the duty cycle and then decrease it to restore the initial duty cycle.

[0094] The second adjustment mode determination unit is used to determine the dynamic adjustment mode when the discharge intensity decreases, that is, to execute the second adjustment stage in the first half of the current working cycle and the first adjustment stage in the second half of the current working cycle.

[0095] The operating voltage acquisition unit is used to acquire the current operating voltage of the glow discharge component.

[0096] The adjustment amount determination unit is used to determine the single duty cycle adjustment amount of the first adjustment stage and the second adjustment stage based on the current operating voltage.

[0097] In some optional implementations, the adjustment amount determination unit includes: The calculation subunit is used to calculate the voltage difference between the current operating voltage and the preset standard operating voltage.

[0098] The adjustment amount determination subunit is used to determine the single duty cycle adjustment amount based on the voltage difference, and the single duty cycle adjustment amount is positively correlated with the voltage difference.

[0099] The adjustment mode determination unit is used to determine the duty cycle adjustment mode of the first adjustment stage and the second adjustment stage based on the single duty cycle adjustment amount and the preset total duty cycle adjustment amount.

[0100] In some optional implementations, the adjustment method determination unit includes: The first adjustment mode determination sub-unit is used in the first adjustment stage to gradually reduce the duty cycle from the initial duty cycle according to the single duty cycle adjustment amount until the total reduction of the duty cycle reaches the preset total duty cycle adjustment amount, and then gradually increase the duty cycle according to the single duty cycle adjustment amount until the initial duty cycle is restored.

[0101] The second adjustment method determination sub-unit is used in the second adjustment stage to gradually increase the duty cycle from the initial duty cycle according to the single duty cycle adjustment amount until the total increase in duty cycle reaches the preset total duty cycle adjustment amount, and then gradually decrease the duty cycle according to the single duty cycle adjustment amount until the initial duty cycle is restored.

[0102] The glow discharge device control apparatus provided in this embodiment of the invention can execute the glow discharge device control method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the method. Further functional descriptions of the various modules and units described above are the same as in the corresponding embodiments described above, and will not be repeated here.

[0103] Figure 9 This is a schematic diagram of the structure of a controller provided in an embodiment of the present invention.

[0104] The following is a detailed reference. Figure 9 The diagram illustrates a structural schematic suitable for implementing a controller in an embodiment of the present invention. The controller may include a processor (e.g., a central processing unit, graphics processing unit, etc.) 901, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 902 or a program loaded from memory 908 into random access memory (RAM) 903. The RAM 903 also stores various programs and data required for controller operation. The processor 901, ROM 902, and RAM 903 are interconnected via a bus 904. An input / output (I / O) interface 905 is also connected to the bus 904.

[0105] Typically, the following devices can be connected to I / O interface 905: input devices 906 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 907 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 908 including, for example, magnetic tapes, hard disks, etc.; and communication devices 909. Communication device 909 allows the controller to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 9 A controller with various devices is shown, but it should be understood that it is not required to implement or have all of the devices shown, and may alternatively implement or have more or fewer devices.

[0106] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 909, or installed from a memory 908, or installed from a ROM 902. When the computer program is executed by the processor 901, it performs the functions defined in the glow discharge device control method of the embodiments of the present invention.

[0107] Figure 9 The controller shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0108] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the glow discharge device control method shown in the above embodiments is implemented.

[0109] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0110] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A control method for a glow discharge device, characterized in that, Applied to a glow discharge device, the glow discharge device comprising: a glow discharge assembly, the method comprising: Determine the fundamental frequency and initial duty cycle of the pulse width modulation drive signal for the glow discharge component; During the operation of the glow discharge component driven by the pulse width modulation drive signal, in response to the detection of a change in the discharge intensity of the glow discharge component, the dynamic adjustment mode of the initial duty cycle is determined based on the change in discharge intensity. During the current operating cycle of the glow discharge component, the initial duty cycle is adjusted according to the dynamic adjustment method.

2. The method according to claim 1, characterized in that, The dynamic adjustment method for determining the initial duty cycle based on changes in discharge intensity includes: When the discharge intensity increases, the dynamic adjustment method is determined to be to execute the first adjustment stage in the first half of the current working cycle and the second adjustment stage in the second half of the current working cycle; the first adjustment stage is to first decrease the duty cycle and then increase it to restore the initial duty cycle, and the second adjustment stage is to first increase the duty cycle and then decrease it to restore the initial duty cycle; When the discharge intensity decreases, the dynamic adjustment method is determined to be to execute the second adjustment stage in the first half of the current working cycle and the first adjustment stage in the second half of the current working cycle.

3. The method according to claim 1, characterized in that, The dynamic adjustment method for determining the initial duty cycle based on changes in discharge intensity further includes: Obtain the current operating voltage of the glow discharge component; The single duty cycle adjustment amount for the first and second adjustment stages is determined based on the current operating voltage. The duty cycle adjustment methods for the first adjustment stage and the second adjustment stage are determined based on the single duty cycle adjustment amount and the preset total duty cycle adjustment amount.

4. The method according to claim 3, characterized in that, The step of determining the single duty cycle adjustment amount for the first adjustment stage and the second adjustment stage based on the current operating voltage includes: Calculate the voltage difference between the current operating voltage and the preset standard operating voltage; The single duty cycle adjustment amount is determined based on the voltage difference, and the single duty cycle adjustment amount is positively correlated with the voltage difference.

5. The method according to claim 3, characterized in that, The method of determining the duty cycle adjustment mode for the first adjustment stage and the second adjustment stage based on the single duty cycle adjustment amount and the preset total duty cycle adjustment amount includes: In the first adjustment phase, starting from the initial duty cycle, the duty cycle is gradually reduced according to the single duty cycle adjustment amount until the total reduction of the duty cycle reaches the preset total duty cycle adjustment amount. Then, the duty cycle is gradually increased according to the single duty cycle adjustment amount until the initial duty cycle is restored. In the second adjustment phase, starting from the initial duty cycle, the duty cycle is gradually increased according to the single duty cycle adjustment amount until the total increase in duty cycle reaches the preset total duty cycle adjustment amount. Then, the duty cycle is gradually decreased according to the single duty cycle adjustment amount until the initial duty cycle is restored.

6. The method according to claim 1, characterized in that, Determining the fundamental frequency of the pulse width modulation drive signal for the glow discharge component includes: A pulse width modulation drive signal is applied to the glow discharge component, and the first and second voltage zero crossing points of the glow discharge component are collected within a preset time. The discharge half-cycle of the glow discharge component is determined based on the first voltage zero-crossing point and the second voltage zero-crossing point. The fundamental frequency is determined based on the discharge half-cycle.

7. The method according to claim 1, characterized in that, Determining the initial duty cycle of the pulse width modulation drive signal for the glow discharge component includes: The initial duty cycle is determined based on the base frequency.

8. A control device for a glow discharge equipment, characterized in that, Applied to glow discharge equipment, the glow discharge equipment includes: a glow discharge component, the device includes: The first determining module is used to determine the fundamental frequency and initial duty cycle of the pulse width modulation drive signal of the glow discharge component; The second determining module is used to determine the dynamic adjustment mode of the initial duty cycle based on the change in discharge intensity of the glow discharge component when the pulse width modulation driving signal drives the glow discharge component to work. An adjustment module is used to adjust the initial duty cycle of the glow discharge assembly according to the dynamic adjustment method during the current working cycle.

9. A glow discharge device, characterized in that, The glow discharge device includes: a glow discharge component and a controller, the controller including: A memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, the processor executing the computer instructions to perform the method of any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the method of any one of claims 1 to 7.

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