Plasma generation device abnormity judgment method, air outlet equipment and control method of air outlet equipment

Abstract

The invention discloses a plasma generation device abnormity judgment method, air outlet equipment and a control method of the air outlet equipment, and belongs to the field of air sterilization. The plasma generating device abnormity judgment method comprises the steps that sampling current of a plasma generating device is obtained, target parameters are obtained based on the sampling current, the target parameters comprise any one of a current peak value, a current mean value and a current effective value, and whether ignition of plasma is abnormal or not is determined based on the target parameters. According to the scheme of the invention, when the ignition of the plasma generating device is abnormal, judgment can be carried out through the target parameter obtained by sampling the current, and the abnormal ignition of the plasma generating device can be found in time. At the moment, when the plasma is applied to the air outlet equipment, dust can be removed for the plasma through outlet air of the air outlet equipment when the plasma is abnormally ignited, so that the plasma is prevented from being abnormally ignited again.

Description

Technical Field

[0001] The present application relates to the technical field of air sterilization, and in particular, to a method for determining abnormality of a plasma generating device, an air outlet device and a control method thereof. Background Art

[0002] Plasma is a fundamental form of matter, a collection of charged particles (including positive ions, negative ions, and electrons) and various neutral particles (atoms, molecules, free radicals, and reactive groups). Macroscopically, it is electrically neutral. Plasma generated by high-pressure devices at room temperature is a type of atmospheric-pressure, non-thermal equilibrium plasma, commonly known as cold plasma. Its advantages lie in the low temperature of the plasma gas, typically near room temperature, but the presence of very high-temperature electrons. Furthermore, it is rich in free radicals and reactive groups. These electrons, free radicals, and reactive groups play a crucial role in effectively killing bacteria in the air. When ambient air passes through the plasma discharge zone, it rapidly kills airborne bacteria.

[0003] Due to the recent outbreaks of COVID-19 and influenza, people are paying more and more attention to the demand for indoor sterilization and virus removal, which has led to the emergence of a series of plasma sterilization and virus removal air purifiers and air conditioners. That is, the air purifier or air conditioner is equipped with a plasma generator, which generates plasma and releases it into the air. The plasma generator generally consists of two high-voltage electrodes with high-density corona discharge. However, after the plasma generator has been working for a long time, dust will be absorbed by the high-voltage electrodes (or condensation will produce water droplets), resulting in a smaller distance between the high-voltage electrodes, which makes it easy for the two poles to ignite. Continuous ignition may intensify the production of ozone, and the high temperature of the ignition arc will form an ignition source, affecting the electrical safety of the product. Therefore, the above problems need to be solved. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the present application provides a method for determining abnormalities in a plasma generator, an air outlet device, and a control method thereof, so as to solve the problem that after the plasma generator has been working for a long time, the high-voltage electrodes will absorb dust, resulting in a decrease in the distance between the high-voltage electrodes, which makes it easy for the two electrodes to ignite. Continuous ignition may aggravate the production of ozone, and the high temperature of the ignition arc will form an ignition source, affecting the electrical safety of the product.

[0005] The technical solution adopted by this application to solve its technical problems is:

[0006] In a first aspect, a method for determining abnormality of a plasma generating device is provided, comprising:

[0007] obtaining a sampled current of the plasma generating device;

[0008] Acquire a target parameter based on the sampled current, wherein the target parameter includes any one of the following: a current peak value, a current average value, and a current effective value;

[0009] It is determined whether the plasma generating device has ignition abnormality based on the target parameter.

[0010] As an optional implementation of the present application, when the target parameter is a current peak value, obtaining the target parameter based on the sampled current includes:

[0011] Get all sampled currents within a preset period;

[0012] The maximum value of the sampled currents within the preset period is taken as the current peak value.

[0013] As an optional implementation of the present application, when the target parameter is a current peak value, determining whether the plasma generating device has an ignition abnormality based on the target parameter includes:

[0014] Obtain the current average value within a preset period;

[0015] Calculating a peak change rate based on the current average value and the current peak value, wherein the peak change rate=current peak value / current average value;

[0016] If the peak value change rate is greater than the preset change rate, it is determined that the plasma generating device has an ignition abnormality; if the peak value change rate is less than or equal to the preset change rate, it is determined that the plasma generating device has an ignition abnormality.

[0017] As an optional implementation of the present application, when the target parameter is a current mean value, determining whether the plasma generating device has an ignition abnormality based on the target parameter includes:

[0018] If the current average is greater than a preset current average, it is determined that the plasma generating device has ignited abnormally; if the current average is less than or equal to the preset current average, it is determined that the plasma generating device has not ignited abnormally.

[0019] As an optional implementation of the present application, when the target parameter is the effective value of current, determining whether the plasma generating device has ignition abnormality based on the target parameter includes:

[0020] If the effective current value is greater than the preset effective current value, it is determined that the plasma generating device has ignited abnormally; if the effective current value is less than or equal to the effective current value, it is determined that the plasma generating device has not ignited abnormally.

[0021] As an optional implementation of this application, the following is also included:

[0022] When it is determined that the plasma generating device has ignition abnormality, power supply to the plasma generating device is disconnected.

[0023] In a second aspect, an air outlet device is provided, the air outlet device including a plasma generator, and the plasma generator uses any of the above-mentioned plasma generator abnormality judgment methods to judge whether ignition is abnormal.

[0024] In a third aspect, a method for controlling an air outlet device is provided, which is applied to the air outlet device provided by the above solution, and the method includes:

[0025] When it is determined that the plasma generating device has ignition abnormality, the ignition abnormality protection is turned on;

[0026] The ignition abnormality protection includes:

[0027] The plasma generating device is powered off; the fan is controlled to open the maximum wind speed, and the wind sweeping plate and / or the wind guide plate are controlled to rotate to a specific angle so that the air outlet of the air outlet device can blow toward the plasma generating device.

[0028] As an optional implementation of this application, the following is also included:

[0029] Get the number of times the ignition abnormality protection is enabled;

[0030] When the number of activations of the ignition abnormality protection is less than a preset number, after the fan is turned on for a preset time, the ignition abnormality protection is exited, the power supply to the plasma generating device is restored, and it is determined whether the plasma generating device has an ignition abnormality, and the ignition abnormality protection is activated in the plasma generating device;

[0031] The abnormal exit protection includes:

[0032] The fan damper, the wind sweeping plate and / or the wind guide plate are controlled to return to the settings before the plasma generating device ignites abnormally.

[0033] As an optional implementation of this application, the following is also included:

[0034] When the number of times the ignition abnormality protection is turned on is greater than a preset number, the number of times the ignition abnormality protection is turned on is reset to zero, the power supply to the plasma generating device remains disconnected, and a fault message is sent to remind the user that there is an ignition abnormality in the plasma.

[0035] Beneficial effects:

[0036] The technical solution of the present application provides a method for determining abnormalities in a plasma generator, an air outlet device, and a control method thereof. The method for determining abnormalities in a plasma generator includes obtaining a sampled current of the plasma generator, obtaining a target parameter based on the sampled current, the target parameter including any one of the following: current peak value, current mean value, and current effective value, and determining whether the plasma ignites abnormally based on the target parameter. The present application solution can determine abnormal ignition of the plasma generator by using the target parameter obtained by the sampled current, and can promptly detect abnormal ignition of the plasma generator. At this time, when the air outlet device applies plasma, the air outlet device can also be used to remove dust from the plasma when the plasma ignites abnormally, so as to avoid abnormal ignition of the plasma again. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 This is a flow chart of a method for determining abnormality of a plasma generating device provided in an embodiment of the present application;

[0039] Figure 2 This is a flow chart of a method for controlling an air outlet device provided in an embodiment of the present application;

[0040] Figure 3 This is a circuit diagram of a plasma generating device provided in an embodiment of the present application;

[0041] Figure 4 This is a flow chart for determining ignition abnormality in a plasma generating device provided in an embodiment of the present application;

[0042] Figure 5 This is a flow chart of an air conditioning abnormality protection processing method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application are described in detail below with reference to the accompanying drawings and examples. Obviously, the described embodiments are only some of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other implementation methods obtained by ordinary technicians in this field without making any creative work are within the scope of protection of this application.

[0044] Reference Figure 1, an embodiment of the present application provides a method for determining abnormality of a plasma generating device, comprising:

[0045] S11: obtaining a sampled current of the plasma generating device;

[0046] It should be noted that the sampling current is obtained through the current sampling circuit of the plasma generating device.

[0047] S12: Acquire a target parameter based on the sampled current, where the target parameter includes any one of the following: a current peak value, a current average value, and a current effective value.

[0048] In one embodiment, when the target parameter is a current peak value, obtaining the target parameter based on the sampled current includes:

[0049] Get all sampled currents within a preset period;

[0050] The maximum value of the sampled currents within the preset period is taken as the current peak value.

[0051] S13: Determine whether the plasma generating device has ignition abnormality based on the target parameter.

[0052] In one embodiment, when the target parameter is a current peak value, determining whether the plasma generating device has ignition abnormality based on the target parameter includes:

[0053] Obtain the current average value within a preset period;

[0054] Calculating a peak change rate based on the current average value and the current peak value, wherein the peak change rate=current peak value / current average value;

[0055] If the peak value change rate is greater than the preset change rate, it is determined that the plasma generating device has an ignition abnormality; if the peak value change rate is less than or equal to the preset change rate, it is determined that the plasma generating device has an ignition abnormality.

[0056] In another embodiment, if the current peak value is greater than a preset current peak value, it is determined that the plasma generating device has ignited abnormally; if the current peak value is less than or equal to the preset current peak value, it is determined that the plasma generating device has not ignited abnormally.

[0057] Optionally, when the target parameter is a current mean value, determining whether the plasma generating device has an ignition abnormality based on the target parameter includes:

[0058] If the current average is greater than a preset current average, it is determined that the plasma generating device has ignited abnormally; if the current average is less than or equal to the preset current average, it is determined that the plasma generating device has not ignited abnormally.

[0059] Alternatively, when the target parameter is the effective value of current, determining whether the plasma generating device has ignition abnormality based on the target parameter includes:

[0060] If the effective current value is greater than the preset effective current value, it is determined that the plasma generating device has ignited abnormally; if the effective current value is less than or equal to the effective current value, it is determined that the plasma generating device has not ignited abnormally.

[0061] It should be noted that when it is determined that the plasma generating device has ignition abnormality, the power supply to the plasma generating device is disconnected.

[0062] The method for determining abnormality in a plasma generator provided in an embodiment of the present application includes obtaining a sampled current of the plasma generator, obtaining a target parameter based on the sampled current, wherein the target parameter includes any one of the following: current peak value, current mean value, and current effective value; and determining whether the plasma ignition is abnormal based on the target parameter. The present application solution can determine when the plasma generator ignites abnormally by using the target parameter obtained by the sampled current, and can promptly detect when the plasma generator ignites abnormally.

[0063] Based on the same inventive concept, an embodiment of the present application provides an air outlet device, which includes a plasma generator. The plasma generator uses the plasma generator abnormality judgment method provided in the above embodiment to judge whether the ignition is abnormal.

[0064] Exemplarily, the air outlet device includes an air conditioner or an air purifier.

[0065] The air outlet device provided in the embodiment of the present application includes a plasma generator. The plasma generator uses the plasma generator abnormality judgment method provided in the above embodiment to determine whether there is an ignition abnormality. When the plasma generator has an ignition abnormality, it can be discovered in time to ensure the safe operation of the air outlet device.

[0066] Based on the same inventive concept, Figure 2 As shown, an embodiment of the present application provides a method for controlling an air outlet device, which is applied to the air outlet device provided by the above solution, and the method includes:

[0067] When it is determined that the plasma generating device has ignition abnormality, the ignition abnormality protection is turned on;

[0068] The ignition abnormality protection includes:

[0069] The plasma generating device is powered off; the fan is controlled to open the maximum wind speed, and the wind sweeping plate and / or the wind guide plate are controlled to rotate to a specific angle so that the air outlet of the air outlet device can blow toward the plasma generating device.

[0070] Among them, disconnecting the power supply of the plasma generator can prevent the plasma generator from continuing to ignite, avoid generating ozone, and ensure the electrical safety of the product.

[0071] By controlling the fan to open the maximum wind speed and controlling the wind sweep plate and / or wind guide plate to rotate to a specific angle, the air outlet of the air outlet device can be blown toward the plasma generator to blow away the dust at the high-voltage electrode of the plasma generator, thereby preventing the plasma generator from igniting after it is restarted.

[0072] As a preferred implementation of this application, it also includes:

[0073] Get the number of times the ignition abnormality protection is enabled.

[0074] When the number of activations of the ignition abnormality protection is less than a preset number, after the fan is turned on for a preset time, the ignition abnormality protection is exited, the power supply to the plasma generating device is restored, and it is determined whether the plasma generating device has an ignition abnormality, and the ignition abnormality protection is activated in the plasma generating device;

[0075] The abnormal exit protection includes:

[0076] The fan damper, the wind sweeping plate and / or the wind guide plate are controlled to return to the settings before the plasma generating device ignites abnormally.

[0077] When the number of times the ignition abnormality protection is turned on is greater than a preset number, the number of times the ignition abnormality protection is turned on is reset to zero, the power supply to the plasma generating device remains disconnected, and a fault message is sent to remind the user that there is an ignition abnormality in the plasma.

[0078] Generally, dust on the high-voltage electrode of a plasma generator can be blown away by the air outlet of the air outlet device. Therefore, after an ignition anomaly occurs, it is sufficient to control the air outlet of the air outlet device. There is no need to immediately report a plasma generator failure. In practice, the dust on the high-voltage electrode of a plasma generator is relatively stubborn and may not be completely removed with one blow. Therefore, the ignition anomaly protection can be activated several times. However, in some special cases, the dust may not be removed, or the plasma electrode may be faulty. In this case, the ignition anomaly protection cannot resolve the ignition anomaly, so the number of activations of the ignition anomaly protection is reset to zero, and the power supply to the plasma generator is permanently disconnected until the repair is completed.

[0079] It should be noted that after exiting the ignition abnormality protection, if the power supply of the plasma generating device is restored and the ignition abnormality is detected again, the ignition abnormality protection is turned on, and the number of times the ignition abnormality protection is turned on is +1. If no ignition abnormality is detected, the number of times the ignition abnormality protection is turned on is reset to zero.

[0080] The air outlet device control method provided in the embodiment of the present application turns on the ignition abnormality protection when it is determined that the plasma generator has an ignition abnormality. That is, the power supply to the plasma generator is disconnected; the fan is controlled to open the maximum wind speed, and the wind sweeping plate and / or the wind guide plate are controlled to rotate to a specific angle so that the air outlet of the air outlet device can blow towards the plasma generator to remove dust. After the fan is turned on for a preset period of time, the ignition abnormality protection is exited and the power supply to the plasma generator is restored to determine whether the dust has been cleared. If it has been cleared, the ignition abnormality will not be detected again. The solution of the present application can use the air outlet of the air outlet device to remove dust from the plasma generator. In some cases, there is no need to manually remove the dust, thereby ensuring the operation of the air outlet device.

[0081] In order to more clearly illustrate the present application solution, a specific implementation method is provided below.

[0082] 1. Hardware circuit

[0083] If a plasma generator is used in an air conditioner, it is generally installed at the air outlet of the air conditioner to generate a large amount of plasma and release it into the air to achieve a sterilization effect.

[0084] like Figure 3 As shown, the circuit of the plasma generator consists of the following two parts: plasma generation circuit and protection circuit:

[0085] The plasma generating circuit includes:

[0086] 12V DC input, self-excited oscillation circuit, boost circuit, voltage doubler circuit and high voltage output part.

[0087] The 12V DC input is the device's power supply, typically including basic voltage regulation and filtering. A self-oscillating circuit converts the 12V DC to AC, which is then fed through a step-up transformer to output a high voltage (typically 1500V to 3000V). This high voltage is then doubled by a voltage-doubling circuit, generating a higher voltage output (typically 4000V to 8000V), which serves as the power supply for the plasma electrodes.

[0088] The protection circuit includes:

[0089] Current sampling circuit, signal amplification circuit, MCU control unit and switching circuit.

[0090] The current sampling circuit collects the current value of the 12V power supply, amplifies the signal through the operational amplifier circuit, and inputs it into the MCU control unit for information analysis and processing. When an abnormal current signal is identified, the control switch circuit disconnects the 12V input, so that no high voltage is generated.

[0091] The above circuits are all existing solutions in the industry, so the specific circuit structure and operating principle will not be described in detail.

[0092] 2. Ignition abnormality judgment method

[0093] When sparks or arcs occur on the high-voltage side of the plasma, the rapid release of energy will cause a sharp increase in the input current peak, and this feature can be used for judgment.

[0094] The main control unit obtains the real-time sampled current value and processes it according to the following steps to determine whether the plasma generator has ignited:

[0095] Step 1: Define a single processing window. A processing window is 0.01ms to 1ms. Within each window, collect at least m current values ​​(m can be 100 to 1000) at an average interval. The current value is recorded as [I1, Im].

[0096] Step 2: Obtain the peak value (maximum value) of the data array of a single processing window data [I1,Im], recorded as I_peak.

[0097] Step 3: Get the average value of the data array of a single processing window data [I1,Im], that is, the average value

[0098] I_avg=(I1+I2+I3+...+Im) / m.

[0099] Step 4: Calculate the peak rate of change: k = I_peak / I_avg;

[0100] Step 5: If the peak change rate k is greater than the preset value (e.g. >5), it indicates that the current peak value has suddenly changed, and an abnormal spark condition exists at this moment. (Under normal circumstances, the change rate of the DC peak and average values ​​is close to 1);

[0101] Step 6: Control the switch circuit to disconnect the 12V input.

[0102] 3. Abnormal protection restart method

[0103] If the plasma device is installed in an air conditioner, when it detects that the plasma device has ignited, on the one hand, the plasma device will actively disconnect the 12V input. On the other hand, the plasma device will inform the air conditioner main control unit of the abnormal state, and control the air conditioner to open the fan to the maximum wind speed, and the sweep wind or wind guide plate to blow towards the plasma device, that is, the dust from the plasma device is blown away by the air conditioner. (Because the air can pass through the plasma device after the air conditioner is turned on, but the air volume is not concentrated, the amount of air passing through will be small. It is necessary to control the angle of the sweep wind or wind guide plate. For example, if the device is installed on the left side of the air conditioner, then the left and right sweep winds will be blown in a directional manner to the left; this can achieve the maximum air volume blowing the ion device)

[0104] After the fan has been running for a certain period of time, the air conditioner's windage, wind guide, and air sweep settings return to their original settings. Restart the switch to supply power to the 12V input and further determine whether there is ignition anomaly protection. If the anomaly protection occurs multiple times (e.g., 3-5 times), it will not be activated again. The air conditioner will then issue a fault reminder, alerting the user through a fault code or push notification message that the function is abnormal and cannot work, thus avoiding ignition and other problems.

[0105] This solution utilizes the current sampling circuit in the plasma generator's main circuit to detect changes in the effective current value and increase in peak value during the ignition discharge process. If these characteristics are met, it is determined to be an ignition, and the input power is disconnected. If an ignition is detected, the air conditioner is set at high speed and blows air in a directional manner to remove dust from the ion generator, restarting operation. This ensures stable and reliable operation of the plasma generator and provides proactive protection in the event of an anomaly.

[0106] It should be noted that, in the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0107] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

Claims

1. A method for determining abnormality of a plasma generator, characterized in that: include: obtaining a sampled current of the plasma generating device; Acquire a target parameter based on the sampled current, wherein the target parameter includes any one of the following: a current peak value, a current average value, and a current effective value; It is determined whether the plasma generating device has ignition abnormality based on the target parameter.

2. The method according to claim 1, wherein: When the target parameter is a current peak value, obtaining the target parameter based on the sampled current includes: Get all sampled currents within a preset period; The maximum value of the sampled currents within the preset period is taken as the current peak value.

3. The method according to claim 1, wherein: When the target parameter is a current peak value, determining whether the plasma generating device has an ignition abnormality based on the target parameter includes: Obtain the current average value within a preset period; Calculating a peak change rate based on the current average value and the current peak value, wherein the peak change rate=current peak value / current average value; If the peak value change rate is greater than the preset change rate, it is determined that the plasma generating device has an ignition abnormality; if the peak value change rate is less than or equal to the preset change rate, it is determined that the plasma generating device has an ignition abnormality.

4. The method according to claim 1, wherein: When the target parameter is the current mean value, determining whether the plasma generating device has ignition abnormality based on the target parameter includes: If the current average is greater than a preset current average, it is determined that the plasma generating device has ignited abnormally; if the current average is less than or equal to the preset current average, it is determined that the plasma generating device has not ignited abnormally.

5. The method according to claim 1, wherein: When the target parameter is the effective value of current, determining whether the plasma generating device has ignition abnormality based on the target parameter includes: If the effective current value is greater than the preset effective current value, it is determined that the plasma generating device has ignited abnormally; if the effective current value is less than or equal to the effective current value, it is determined that the plasma generating device has not ignited abnormally.

6. The method according to claim 1, characterized in that Also includes: When it is determined that the plasma generating device has ignition abnormality, power supply to the plasma generating device is disconnected.

7. An air outlet device, characterized in that: The air outlet device includes a plasma generating device, and the plasma generating device uses the method according to any one of claims 1 to 6 to determine whether ignition is abnormal.

8. A method for controlling an air outlet device, characterized in that: Applied to the air outlet device according to claim 7, the method comprises: When it is determined that the plasma generating device has ignition abnormality, the ignition abnormality protection is turned on; The ignition abnormality protection includes: The plasma generating device is powered off; the fan is controlled to open the maximum wind speed, and the wind sweeping plate and / or the wind guide plate are controlled to rotate to a specific angle so that the air outlet of the air outlet device can blow toward the plasma generating device.

9. The method according to claim 8, characterized in that Also includes: Get the number of times the ignition abnormality protection is enabled; When the number of activations of the ignition abnormality protection is less than a preset number, after the fan is turned on for a preset time, the ignition abnormality protection is exited, the power supply to the plasma generating device is restored, and it is determined whether the plasma generating device has an ignition abnormality, and the ignition abnormality protection is activated in the plasma generating device; The abnormal exit protection includes: The fan damper, the wind sweeping plate and / or the wind guide plate are controlled to return to the settings before the plasma generating device ignites abnormally.

10. The method according to claim 9, characterized in that Also includes: When the number of times the ignition abnormality protection is turned on is greater than a preset number, the number of times the ignition abnormality protection is turned on is reset to zero, the power supply to the plasma generating device remains disconnected, and a fault message is sent to remind the user that there is an ignition abnormality in the plasma.

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