Streaming sterilization device, control method thereof, electronic equipment and storage medium

Abstract

The invention discloses a streamer sterilization device and a control method thereof, electronic equipment and a storage medium. The streamer sterilization device comprises a power supply driving circuit for boosting, a plasma generator working based on a driving power supply output by the power supply driving circuit, and an environment detection circuit for detecting environment parameters, the power supply driving circuit comprises a booster circuit and a microcontroller. The low-voltage side power supply is boosted by the boosted circuit and then supplies power to the positive electrode of the plasma generator; wherein the microcontroller is provided with a first port for outputting a first pulse width modulation (PWM) signal, and the input side of the booster circuit is provided with a first switch tube for conducting control based on the first PWM signal; the microcontroller also receives a parameter value of at least one environmental parameter of the current environment detected by the environment detection circuit.

Description

Technical Field

[0001] The present application relates to the field of circuits, and in particular to a streamer sterilization device and a control method thereof, an electronic device and a storage medium. Background Art

[0002] In the related technology, there is a streamer sterilization device based on dielectric barrier discharge (DBD). The streamer sterilization device applies a certain mode voltage between electrodes to generate a streamer discharge phenomenon. During the streamer discharge process, the local air is ionized, and active substances with super strong oxidation properties can be produced. It has a significant inactivation effect on bacteria and viruses and can be used for purification and sterilization. When the external environment changes, the discharge starting voltage of the streamer sterilization device changes accordingly, which can easily cause the air gap between the electrodes to be broken down, causing sparks, resulting in unstable operation of the streamer sterilization device. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a streamer sterilization device and a control method thereof, an electronic device and a storage medium, aiming to improve the operating stability of the streamer sterilization device.

[0004] The technical solution of the embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a streamer sterilization device, comprising: a power drive circuit for boosting, a plasma generator operating based on a drive power output by the power drive circuit, and an environment detection circuit for detecting environmental parameters;

[0006] The power drive circuit comprises: a boost circuit and a microcontroller; the low-voltage side power supply is boosted by the boost circuit and supplies power to the positive electrode of the plasma generator;

[0007] Among them, the microcontroller has a first port for outputting a first pulse width modulation (PWM) signal, and the input side of the boost circuit is provided with a first switch tube for conduction control based on the first PWM signal; the microcontroller also receives a parameter value of at least one environmental parameter of the current environment detected by the environmental detection circuit.

[0008] In some embodiments, the device further comprises:

[0009] The voltage doubler circuit is arranged between the output side of the voltage booster circuit and the positive electrode of the plasma generator.

[0010] In some embodiments, the boost circuit includes: a transformer, the first switch tube is arranged on the primary winding side of the transformer, and the voltage doubling circuit is arranged between the secondary winding of the transformer and the positive electrode of the plasma generator.

[0011] In some embodiments, the microcontroller further has a second port for outputting a second PWM signal, and the input side of the boost circuit is further provided with a second switch tube for conducting control based on the second PWM signal;

[0012] The primary winding of the transformer includes a first primary winding and a second primary winding, the first primary winding is connected to the first switch tube, the second primary winding is connected to the second switch tube, and the number of coil turns of the first primary winding is less than the number of coil turns of the second primary winding.

[0013] In some embodiments, the plasma generator includes a positive electrode, a first negative electrode, and a second negative electrode, the positive electrode is located between the first negative electrode and the second negative electrode, and the distance between the first negative electrode and the positive electrode is smaller than the distance between the second negative electrode and the positive electrode;

[0014] The microcontroller further comprises a third port for outputting a first electrical signal, and the first negative electrode is connected to a first relay for conducting control based on the first electrical signal;

[0015] The microcontroller further includes a fourth port for outputting a second electrical signal, and the second negative electrode is connected to a second relay that performs conduction control based on the second electrical signal.

[0016] In a second aspect, the embodiment of the present application provides a control method of the streamer sterilization device as described in the first aspect of the embodiment of the present application, comprising:

[0017] Based on the parameter value of the at least one environmental parameter, the output voltage of the power driving circuit is adjusted.

[0018] In some embodiments, adjusting the output voltage of the power driver circuit based on the parameter value of the at least one environmental parameter includes:

[0019] If a parameter value of at least one environmental parameter is greater than or equal to a first set value, the output voltage of the power driving circuit is reduced based on the duty cycle of the first PWM signal and / or the second PWM signal.

[0020] In some embodiments, reducing the output voltage of the power driving circuit based on the duty cycle of the first PWM signal and / or the second PWM signal includes:

[0021] When the first switch tube is turned on and the second switch tube is turned off, the duty cycle of the first PWM signal is controlled to decrease at a set rate until the output voltage of the power drive circuit decreases to a second set value;

[0022] When the second switch tube is turned on and the first switch tube is turned off, the duty cycle of the second PWM signal is controlled to decrease at a set rate until the output voltage of the power drive circuit decreases to the second set value.

[0023] In some embodiments, reducing the output voltage of the power driving circuit based on the duty cycle of the first PWM signal and / or the second PWM signal includes:

[0024] When the first switch tube is turned on and the second switch tube is turned off, the first switch tube is controlled to be turned off based on the first PWM signal, and the second switch tube is controlled to be turned on based on the second PWM signal, so as to reduce the step-up ratio of the transformer.

[0025] In some embodiments, the method further comprises:

[0026] When the first relay is closed and the second relay is open, if the parameter value of at least one environmental parameter is greater than or equal to a first set value, the first relay is controlled to be open based on the first electrical signal, and the second relay is controlled to be closed based on the second electrical signal, so that the inter-pole distance of the plasma generator is increased.

[0027] In a third aspect, an embodiment of the present application provides a streamer sterilization device as described in the first aspect of the embodiment of the present application, wherein the microcontroller is configured to execute the method as described in the second aspect of the embodiment of the present application.

[0028] In a fourth aspect, an embodiment of the present application provides an electronic device, including: the streamer sterilization device described in the third aspect of the embodiment of the present application.

[0029] In some embodiments, the electronic device is an air conditioner.

[0030] In a fifth aspect, an embodiment of the present application provides a storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the second aspect of the embodiment of the present application are implemented.

[0031] In the embodiment of the present application, since the microcontroller outputs the first PWM signal, the input side of the boost circuit is provided with a first switch tube for conduction control based on the first PWM signal. The microcontroller also receives the parameter value of at least one environmental parameter of the current environment detected by the environment detection circuit. Therefore, the microcontroller can adjust the duty cycle of the first PWM signal according to the parameter value of at least one environmental parameter of the current environment, so as to adjust the magnitude of the output voltage of the boost circuit, and realize the stable operation of the streamer sterilization device under different environments. For example, when an environmental parameter is too high, the duty cycle of the first PWM signal can be reduced, so as to reduce the output voltage of the boost circuit, thereby suppressing the occurrence of ignition of the ion generator and extending the service life of the electrode pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a circuit diagram of a streamer sterilization device provided by an embodiment of the present invention;

[0033] Figure 2 is a circuit diagram of another streamer sterilization device provided by an embodiment of the present invention;

[0034] Figure 3 A circuit diagram of another streamer sterilization device provided in an embodiment of the present application;

[0035] Figure 4 is a schematic block diagram of a transformer winding switching solution provided by an embodiment of the present invention;

[0036] Figure 5 is a schematic diagram of a transformer winding switching circuit provided by an embodiment of the present invention;

[0037] Figure 6 is a schematic flow chart of a transformer winding switching method provided by an embodiment of the present invention;

[0038] Figure 7 It is a schematic block diagram of a pulse width modulation (PWM) signal conversion solution provided by an embodiment of the present invention;

[0039] Figure 8 is a schematic diagram of a PWM signal conversion circuit provided by an embodiment of the present invention;

[0040] Fig. 9 It is a flow chart of a PWM signal conversion method provided by an embodiment of the present invention;

[0041] Fig.10 is a schematic block diagram of a switching solution for the inter-electrode distance of an electrode pair provided by an embodiment of the present invention;

[0042] Fig.11It is a flow chart of a method for switching the inter-electrode distance of an electrode pair provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0045] In electronic equipment such as air conditioners and fresh air systems, streamer sterilization devices are often used for purification and sterilization. In the related art, there is a streamer sterilization device based on dielectric barrier discharge (DBD). The principle of the dielectric barrier discharge is a non-equilibrium gas discharge in which an insulating medium is inserted into the discharge space, that is, a gas discharge phenomenon of low-temperature discharge plasma is generated in the air gap by inserting an insulating medium into the air gap between two metal electrodes. Dielectric barrier discharge, also known as dielectric barrier corona discharge or silent discharge, ionizes the air during the discharge process to generate plasma; it can be widely used in the production of ozone, modification, grafting, surface tension improvement, cleaning and hydrophilic modification of polymer and metal films and plates. The DBD-based streamer sterilization device can realize the function of air purification and / or sterilization. For example, integrating a streamer sterilization device on an air conditioner can efficiently kill bacteria in the air duct of the air conditioner and in the room, and purify the air well.

[0046] When the external environment changes (such as humidity, temperature, wind speed), the discharge starting voltage of the streamer sterilization device changes accordingly. At this time, it is easy to cause the air gap between the electrodes to be broken down, and sparking occurs, resulting in unstable operation of the streamer sterilization device. Moreover, frequent sparking occurs, the electrodes are easily damaged, and the electrode life is not long. At the same time, the yield of the target product is reduced, and the by-product (ozone) is relatively large.

[0047] Specifically, an increase in air humidity, temperature, air pressure, or suspended particulate matter concentration will cause the air to become less difficult to ionize, and the breakdown voltage of the electrode pair will decrease, making it easier for ignition to occur. Secondly, the higher the input voltage of the electrode pair, the easier it is for the electrode pair to ignite.

[0048] In view of the shortcomings of the above-mentioned related technologies, the embodiments of the present invention provide a streamer sterilization device and a control method thereof, which can improve the operation stability of the streamer sterilization device. In order to illustrate the technical solution of the present invention, a specific embodiment is used for description below.

[0049] The present application embodiment provides a streamer sterilization device, such as Figure 1 As shown, the streamer sterilization device includes: a power drive circuit for boosting, a plasma generator that works based on the drive power output by the power drive circuit, and an environment detection circuit for detecting environmental parameters;

[0050] The power drive circuit comprises: a boost circuit and a microcontroller; the low-voltage side power supply is boosted by the boost circuit and supplies power to the positive electrode of the plasma generator;

[0051] Among them, the microcontroller has a first port for outputting a first pulse width modulation (PWM) signal, and the input side of the boost circuit is provided with a first switch tube for conduction control based on the first PWM signal; the microcontroller also receives a parameter value of at least one environmental parameter of the current environment detected by the environmental detection circuit.

[0052] The low-voltage side power supply is boosted by the boost circuit and then supplies power to the positive electrode of the plasma generator.

[0053] The power drive circuit can convert low-voltage input power into high-voltage square wave output, so that the plasma generator discharges under the drive of the high-voltage square wave. During the discharge process, the air will be ionized to produce free radicals and highly oxidizing molecules, thereby achieving sterilization, deodorization and other effects, and achieving the purpose of streamer sterilization.

[0054] It can be understood that the plasma generator includes a positive electrode and a negative electrode arranged at intervals, and the air between the positive electrode and the negative electrode can be broken down under the action of the high voltage electricity output by the power drive circuit, so that the current flows from the positive electrode to the negative electrode.

[0055] The environment detection circuit may include sensors for detecting various environmental parameters, such as a humidity sensor, a temperature sensor, an air pressure sensor, and a particle concentration sensor.

[0056] Exemplarily, the at least one environmental parameter includes at least one of the following:

[0057] humidity;

[0058] temperature;

[0059] Air pressure;

[0060] Suspended particle concentration.

[0061] The microcontroller receives a parameter value of at least one environmental parameter of the current environment detected by the environment detection circuit. The current environment may refer to indoors. In an indoor scene, an air conditioner with a streamer sterilization device is installed indoors.

[0062] Wherein, based on the duty cycle adjustment of the first PWM signal, the output voltage of the boost circuit can be adjusted.

[0063] The microcontroller can adjust the duty cycle of the first PWM signal according to the parameter value of at least one environmental parameter of the current environment, so as to adjust the output voltage of the boost circuit.

[0064] For example, when the parameter value of at least one environmental parameter is greater than or equal to the first set value, the microcontroller controls the duty cycle of the first PWM signal to decrease at a set rate until the output voltage of the power drive circuit decreases to a second set value.

[0065] The switch tube is controlled based on the PWM control signal. The PWM control signal period is recorded as T, T on is the on time of the PWM control signal, T off is the off time of the PWM control signal, and the PWM control signal cycle T = T on +T off , the duty cycle of the PWM control signal is duty = T on / T, by changing the duty cycle of the PWM control signal, the transformer's step-up ratio can be changed. on , the duty cycle of the PWM control signal can be reduced, thereby reducing the output voltage of the boost circuit.

[0066] Exemplarily, the plasma generator may be a dielectric barrier discharge generator for dielectric barrier discharge.

[0067] In the embodiment of the present application, since the microcontroller outputs the first PWM signal, the input side of the boost circuit is provided with a first switch tube for conduction control based on the first PWM signal. The microcontroller also receives the parameter value of at least one environmental parameter of the current environment detected by the environment detection circuit. Therefore, the microcontroller can adjust the duty cycle of the first PWM signal according to the parameter value of at least one environmental parameter of the current environment, so as to adjust the magnitude of the output voltage of the boost circuit, and realize the stable operation of the streamer sterilization device under different environments. For example, when an environmental parameter is too high, the duty cycle of the first PWM signal can be reduced, so as to reduce the output voltage of the boost circuit, thereby suppressing the occurrence of ignition of the ion generator and extending the service life of the electrode pair.

[0068] For example, Figure 1 As shown, the streamer sterilization device also includes:

[0069] The voltage doubler circuit is arranged between the output side of the voltage booster circuit and the positive electrode of the plasma generator.

[0070] It can be understood that in order to further increase the voltage value of the driving power supply of the plasma generator, a voltage doubler circuit can be set between the output side of the boost circuit and the positive electrode. The voltage doubler circuit can increase the voltage V1 output by the boost circuit. For example, assuming that the boost multiple of the voltage doubler circuit is N, the voltage signal output by the voltage doubler circuit is N*V1.

[0071] Here, the voltage doubling circuit can be constructed based on fast recovery diodes and capacitors, and the voltage is gradually increased by utilizing the unidirectional conductivity of the diode (the characteristics of the switch) and the energy storage characteristics of the capacitor, thereby generating double voltage, triple voltage, and multiple voltage rectifier circuits.

[0072] For example, Figure 1 As shown, the boost circuit includes a transformer, the first switch tube is arranged on the primary winding side of the transformer, and the voltage doubling circuit is arranged between the secondary winding of the transformer and the positive electrode of the plasma generator. In this way, the transformer can be used for voltage boost conversion, and the voltage can be further boosted by the voltage doubling circuit to supply power to the positive electrode of the plasma generator.

[0073] For example, Figure 2 As shown, the microcontroller further has a second port for outputting a second PWM signal, and the input side of the boost circuit is further provided with a second switch tube for conducting control based on the second PWM signal;

[0074] The primary winding of the transformer includes a first primary winding and a second primary winding, the first primary winding is connected to the first switch tube, the second primary winding is connected to the second switch tube, and the number of coil turns of the first primary winding is less than the number of coil turns of the second primary winding.

[0075] In the embodiment of the present application, the transformer has two primary windings, the coil turns of the two primary windings are different, only one primary winding works at a time, and the microcontroller controls the working primary winding through the first PWM signal and the second PWM signal. When different primary windings work, the voltage amplitude after the transformer is stepped up is different.

[0076] For example, the voltage step-up ratio of the transformer is N2 / N1, where N2 is the number of turns of the secondary winding and N1 is the number of turns of the primary winding. N2 / N1=V2 / V1, where V2 is the output voltage of the secondary winding of the transformer and V1 is the primary voltage. It should be understood that N2 is greater than N1. When N2 / N1 is greater than 1, the transformer can achieve the voltage step-up function.

[0077] Among them, by increasing the number of turns of the primary winding, the step-up ratio of the transformer can be reduced, thereby reducing the output voltage of the secondary winding.

[0078] For example, when the first switch tube is turned on and the second switch tube is turned off, if the parameter value of at least one environmental parameter is greater than or equal to the first set value, the microcontroller controls the first switch tube to be turned off based on the first PWM signal, and controls the second switch tube to be turned on based on the second PWM signal, so that the working primary winding of the transformer is switched from the first primary winding to the second primary winding. Since the second primary winding has more turns, the step-up ratio of the transformer can be reduced, thereby reducing the output voltage of the step-up circuit.

[0079] For example, Figure 3 As shown, the plasma generator includes a positive electrode, a first negative electrode and a second negative electrode, the positive electrode is located between the first negative electrode and the second negative electrode, and the distance between the first negative electrode and the positive electrode is smaller than the distance between the second negative electrode and the positive electrode;

[0080] The microcontroller further has a third port for outputting a first electrical signal, and the first negative electrode is connected to a first relay RY1 that performs conduction control based on the first electrical signal;

[0081] The microcontroller further includes a fourth port for outputting a second electrical signal, and the second negative electrode is connected to a second relay RY2 that is controlled to be turned on based on the second electrical signal.

[0082] The distance between the first negative electrode and the positive electrode is L1, the distance between the second negative electrode and the positive electrode is L2, and L2 is greater than L1.

[0083] In the embodiment of the present application, only one of the first relay RY1 and the second relay RY2 can be energized at the same time to form an electrode pair with the positive electrode.

[0084] When the first relay RY1 is energized and the second relay RY2 is disconnected, if at least one environmental parameter has a value greater than or equal to a first set value, the first relay RY1 is controlled to be disconnected based on the first electrical signal, and the second relay RY2 is controlled to be energized based on the second electrical signal, thereby increasing the inter-pole distance between the electrode pairs of the plasma generator, improving the threshold value of the breakdown voltage of the electrode pairs of the plasma generator, reducing the occurrence of sparking, and improving the stability of the electrode pairs.

[0085] The embodiment of the present application further provides a control method of the streamer sterilization device described in the above embodiment, the execution subject of the method is a microcontroller, and the method includes:

[0086] Based on the parameter value of the at least one environmental parameter, the output voltage of the power driving circuit is adjusted.

[0087] Exemplarily, adjusting the output voltage of the power drive circuit based on the parameter value of the at least one environmental parameter includes:

[0088] If a parameter value of at least one environmental parameter is greater than or equal to a first set value, the output voltage of the power driving circuit is reduced based on the duty cycle of the first PWM signal and / or the second PWM signal.

[0089] For example, when the streamer sterilization device has only the first switch tube, the output voltage of the power drive circuit can be reduced by reducing the duty cycle of the first PWM signal, and the output voltage of the power drive circuit can be increased by increasing the duty cycle of the first PWM signal.

[0090] Exemplarily, reducing the output voltage of the power driving circuit based on the duty cycle of the first PWM signal and / or the second PWM signal includes:

[0091] When the first switch tube is turned on and the second switch tube is turned off, the duty cycle of the first PWM signal is controlled to decrease at a set rate until the output voltage of the power drive circuit decreases to a second set value;

[0092] When the second switch tube is turned on and the first switch tube is turned off, the duty cycle of the second PWM signal is controlled to decrease at a set rate until the output voltage of the power drive circuit decreases to the second set value.

[0093] If the streamer sterilization device includes a first switch tube and a second switch tube, only one of the two switch tubes can be in the on state at the same time. When the first switch tube is turned on, the duty cycle of the first PWM signal is controlled to decrease along the set rate, so that the output voltage of the power drive circuit can be reduced; when the second switch tube is turned on, the duty cycle of the second PWM signal is controlled to decrease along the set rate, so that the output voltage of the power drive circuit can be reduced.

[0094] Exemplarily, reducing the output voltage of the power driving circuit based on the duty cycle of the first PWM signal and / or the second PWM signal includes:

[0095] When the first switch tube is turned on and the second switch tube is turned off, the first switch tube is controlled to be turned off based on the first PWM signal, and the second switch tube is controlled to be turned on based on the second PWM signal, so as to reduce the step-up ratio of the transformer.

[0096] In this embodiment, since the first primary winding and the second primary winding have different numbers of turns, when different primary windings are working, the voltage step-up ratio of the transformer is different.

[0097] For example, when the first switch tube is turned on and the second switch tube is turned off, if the parameter value of at least one environmental parameter is greater than or equal to the first set value, the microcontroller controls the first switch tube to be turned off based on the first PWM signal, and controls the second switch tube to be turned on based on the second PWM signal, so that the working primary winding of the transformer is switched from the first primary winding to the second primary winding. Since the second primary winding has more turns, the step-up ratio of the transformer can be reduced, thereby reducing the output voltage of the step-up circuit.

[0098] Exemplarily, the method further includes:

[0099] When the first relay is closed and the second relay is open, if the parameter value of at least one environmental parameter is greater than or equal to a first set value, the first relay is controlled to be open based on the first electrical signal, and the second relay is controlled to be closed based on the second electrical signal, so that the inter-pole distance of the plasma generator is increased.

[0100] like Figure 3 As shown, when the first relay RY1 is energized and the second relay RY1 is disconnected, if the parameter value of at least one environmental parameter is greater than or equal to the first set value, the first relay RY1 is controlled to be disconnected based on the first electrical signal, and the second relay RY2 is controlled to be energized based on the second electrical signal, so that the inter-pole distance of the electrode pair of the plasma generator is increased from L1 to L2. The increase in the inter-pole distance can increase the threshold value of the breakdown voltage of the electrode pair, reduce the occurrence of sparking, and improve the stability of the electrode pair.

[0101] The frequent occurrence of sparking will shorten the service life of the electrode pair. By reducing the occurrence of sparking, the service life of the electrode pair can be extended. In addition, the yield of the target product can be increased, and the generation of ozone can be suppressed.

[0102] In addition, after adjusting the output voltage amplitude of the transformer and / or the threshold value of the breakdown voltage of the electrode pair according to the parameter value of the environmental parameter, if the environmental parameter restores the original parameter value, the output voltage amplitude of the transformer and / or the threshold value of the breakdown voltage of the electrode pair needs to be restored to the initial value to ensure the stable operation of the streamer sterilization device.

[0103] like Figure 4 As shown, Figure 4 The schematic block diagram of a transformer winding switching solution provided by an embodiment of the present invention is shown in FIG.

[0104] For example, two primary windings with one large and one small number of coil turns can be set, and the two primary windings can be flexibly switched for use. When the transformer step-up ratio needs to be reduced, the winding switching part switches to the primary winding with more coil turns.

[0105] Figure 5 Schematic diagram of a transformer winding switching circuit provided by an embodiment of the present invention. Figure 5 In the figure, A is the first primary winding, B is the second primary winding, the first primary winding is connected to the first switch tube Q1, the second primary winding is connected to the second switch tube Q2, Q1 and Q2 are both connected to the microcontroller, the microcontroller controls the conduction state of Q1 through the first PWM signal PWM1, and the microcontroller controls the conduction state of Q2 through the second PWM signal PWM2.

[0106] ① The transformer step-up part: It is mainly composed of VCC power supply and bus capacitor Cin, transformer T1 (two primary windings A and B with different turns, one secondary winding C) and two switch tubes (Q1 and Q2). The microcontroller can select the working primary winding by controlling the switch state of Q1 and Q2. When the PWM signal controls Q1 to turn on and Q2 to be continuously disconnected, the primary winding A works; when the PWM signal controls Q2 to turn on and Q1 to be continuously disconnected, the primary winding B works. When different primary windings work, the transformer has different step-up ratios and different voltage amplitudes after step-up.

[0107] For example, the ratio of the number of turns of the primary winding A to the secondary winding C is 1 / 150 to 200, and the ratio of the number of turns of the primary winding B to the secondary winding C is 1 / 80 to 150. The duty cycle range of the PWM signal controlling Q1 and Q2 is 0.38 to 0.50. When the primary winding A is working, the output voltage range is 7.5kV to 10kV; when the primary winding B is working, the output voltage range is 4kV to 7.5kV.

[0108] ② is the voltage doubler rectifier part: the boosted electrical signal is further increased through the voltage doubler rectifier topology (the example topology here is 3 times the voltage rectifier) ​​to obtain the final DC high voltage V o .

[0109] ③ is a microcontroller, which switches the transformer A / B windings by controlling the conduction state of different switch tubes, adjusts the boost ratio, and ultimately controls the amplitude of the output voltage. The switching logic is as follows Figure 6 As shown in the figure, when the humidity, temperature, air pressure or concentration of suspended particles in the environment reaches the set threshold, the primary winding is switched to a winding with a lower boost ratio to reduce V o amplitude to avoid sparking and ensure stable operation of the system.

[0110] ④ Plasma generator: It ionizes the air locally through high voltage and produces strong oxidizing substances to achieve purification function. Increased air humidity, temperature, air pressure, and suspended particulate matter concentration will all lead to a decrease in the difficulty of air ionization, a decrease in breakdown voltage, and an easy ignition of the system.

[0111] In this embodiment, when the environmental parameter value reaches the set threshold, the voltage between electrodes is reduced to avoid system ignition and maintain stable operation of the system. At the same time, the voltage drop can effectively increase the yield of the target product and reduce the ozone concentration.

[0112] like Figure 6 As shown, Figure 6 It is a flow chart of a transformer winding switching method provided by an embodiment of the present invention.

[0113] S601, obtaining environmental parameters.

[0114] Including detection of humidity, temperature, air pressure and suspended particulate matter concentration.

[0115] The concentration of suspended particulate matter can be PM10, PM2.5, etc.

[0116] S602, determining whether the humidity H is ≥ a set threshold value H1;

[0117] S603, determining whether the temperature T is ≥ a set threshold value T1;

[0118] S604, determining whether the air pressure P is ≥ a set threshold value P1;

[0119] S605, determining whether the suspended particulate matter concentration C is greater than or equal to a set threshold value C1.

[0120] If any of the above S602-S605 is greater than or equal to the set threshold, S606 to S609 are executed. Otherwise, S610 to S613 are executed.

[0121] S606, Q1 is disconnected and Q2 is closed.

[0122] When the PWM signal controls Q2 to close and Q1 to remain open, the B winding works.

[0123] S607, A winding is cut off and B winding is working.

[0124] S608, output voltage V o reduce.

[0125] S609, determining whether the running time t is less than the set time t1.

[0126] If the running time t is greater than or equal to the set time t, the process returns to S601 , otherwise the process continues to S606 .

[0127] S610, Q1 is closed and Q2 is open.

[0128] S611, A winding is working and B winding is cut off.

[0129] S612, output voltage V oIncrease.

[0130] S613, determining whether the running time t is less than the set time t1.

[0131] If the running time t is greater than or equal to the set time t, the process returns to S601 , otherwise the process continues to S610 .

[0132] like Figure 7 As shown, Figure 7 The PWM signal conversion scheme provided by the embodiment of the present invention is a schematic block diagram. Through the PWM signal conversion part, the switching time of the switch tube is adjusted to control the secondary output voltage of the transformer and control the final DC high voltage V o .

[0133] The switch tube is controlled by a PWM control signal. The PWM control signal period is denoted as T, T on is the on time of the PWM control signal, T off is the off time of the PWM control signal, and the PWM control signal cycle T = T on +T off , the duty cycle of the PWM control signal is duty = T on / T, by changing the duty cycle of the PWM control signal, the transformer's step-up ratio can be changed. on , the duty cycle of the PWM control signal can be reduced, thereby reducing the output voltage amplitude of the transformer.

[0134] like Figure 8 As shown, Figure 8 : is a schematic diagram of a PWM signal conversion circuit provided by an embodiment of the present invention. Among them, the primary winding A of the transformer is connected to a switch tube Q1, and the microcontroller can adjust the switching time of the switch tube Q1 by changing the duty cycle of the PWM control signal, thereby controlling the secondary output voltage of the transformer and controlling the final DC high voltage V o .

[0135] For example, the duty cycle range of the PWM signal of Q1 may be 0.3 to 0.50, and the output voltage range of the transformer may be 6 kV to 10 kV.

[0136] like Fig. 9 As shown, Fig. 9 It is a flow chart of a PWM signal conversion method provided by an embodiment of the present invention.

[0137] S901, detecting environmental parameters.

[0138] Including detection of humidity, temperature, air pressure and suspended particulate matter concentration.

[0139] The concentration of suspended particulate matter can be PM10, PM2.5, etc.

[0140] S902, determining whether the humidity H is ≥ a set threshold value H1;

[0141] S903, determining whether the temperature T is ≥ a set threshold value T1;

[0142] S904, determining whether the air pressure P is ≥ a set threshold value P1;

[0143] S905, determining whether the suspended particulate matter concentration C is greater than or equal to a set threshold value C1.

[0144] If any of the above S902-S905 is greater than or equal to the set threshold, S906 to S908 are executed. Otherwise, S909 to S911 are executed.

[0145] S906, reduce the duty cycle of the Q1 PWM signal.

[0146] S907, output voltage V o reduce.

[0147] S908, determining whether the running time t is less than the set time t1.

[0148] If the running time t is greater than or equal to the set time t, the process returns to S901 , otherwise the process continues to S906 .

[0149] S909, increase the duty cycle of the Q1PWM signal.

[0150] S910, output voltage V o Increase.

[0151] S911, determine whether the running time t is less than the set time t1.

[0152] If the running time t is greater than or equal to the set time t, the process returns to S901 , otherwise the process continues to S909 .

[0153] like Fig.10 As shown, Fig.10 This is a schematic diagram of a switching scheme for the inter-electrode spacing of an electrode pair provided by an embodiment of the present invention. This embodiment can flexibly adjust the inter-electrode spacing of the electrode pair, thereby increasing the limit range of the breakdown voltage, greatly reducing the phenomenon of sparking, and improving stability.

[0154] like Figure 3As shown, the first negative electrode is connected to the first relay RY1, and the second negative electrode is connected to the second relay RY2. When the microcontroller controls RY1 to be energized and RY2 is disconnected, the positive electrode and the first negative electrode form an electrode pair, and the inter-electrode distance is L1. When the microcontroller controls RY2 to be energized and RY1 is disconnected, the positive electrode and the second negative electrode form an electrode pair, and the inter-electrode distance is L2. L2 is greater than L1. As the inter-electrode distance increases, the threshold value of the breakdown voltage increases, which can avoid sparking and ensure the stable operation of the streamer sterilization device.

[0155] For example, L1 may range from 12-20 mm, and L2 may range from 20-25 mm.

[0156] The specific control logic is as follows Fig.11 As shown, when it is detected that the humidity, temperature, air pressure, and concentration of air-suspended particles in the environment reach the set threshold, RY2 is energized and RY1 is disconnected, increasing the load pole spacing, suppressing sparking, and ensuring stable operation of the streamer sterilization device.

[0157] like Fig.11 As shown, Fig.11 It is a flow chart of a method for switching the inter-electrode distance of an electrode pair provided in an embodiment of the present invention.

[0158] S1101, detecting environmental parameters.

[0159] Including detection of humidity, temperature, air pressure and suspended particulate matter concentration.

[0160] The concentration of suspended particulate matter can be PM10, PM2.5, etc.

[0161] S1102, determining whether the humidity H is ≥ a set threshold value H1;

[0162] S1103, determining whether the temperature T is ≥ a set threshold value T1;

[0163] S1104, determining whether the air pressure P is ≥ a set threshold value P1;

[0164] S1105, determine whether the suspended particulate matter concentration C is ≥ the set threshold C1.

[0165] As long as any of the above S1102-S1105 is greater than or equal to the set threshold, S1106 to S1108 are executed. Otherwise, S1109 to S1111 are executed.

[0166] S1106, RY2 is energized and RY1 is disconnected.

[0167] S1107, the positive electrode and the second negative electrode work, and the inter-electrode distance is L2.

[0168] S1108, determining whether the running time t is less than the set time t1.

[0169] If the running time t is greater than or equal to the set time t, the process returns to S1101 , otherwise the process continues to S1106 .

[0170] S1109, RY1 is energized and RY2 is disconnected.

[0171] S1110, the positive electrode and the first negative electrode work, and the inter-electrode distance is L1.

[0172] S1111, determine whether the running time t is less than the set time t1.

[0173] If the running time t is greater than or equal to the set time t, the process returns to S1101 , otherwise the process continues to S1109 .

[0174] Exemplarily, after adjusting at least one of the following parameters of the streamer sterilization device, the method further includes:

[0175] After the set time period, parameter values ​​of at least two environmental parameters of the current environment are determined again.

[0176] like Fig.10 In S1108 and S1111, after running for a preset time, the environmental parameters are resampled and judged, and the parameters are adjusted repeatedly.

[0177] Through the above method, the streamer sterilization device can be stably operated under different environments, the problem of streamer stability can be solved, and the risk of ignition can be reduced. In addition, the yield of the target product can be increased, and the generation of ozone can be reduced. The reliability of the electrode can also be extended, and the service life of the streamer sterilization device can be extended.

[0178] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0179] It can be understood that the control method of the streamer sterilization device of the embodiment of the present application can be implemented by a microcontroller configuration program of the streamer sterilization device.

[0180] The embodiment of the present application also provides an electronic device, which includes the streamer sterilization device described above in the embodiment of the present application. In this way, based on the dielectric barrier discharge of the streamer sterilization device, sterilization, deodorization and other effects can be achieved, and the streamer sterilization device can effectively reduce working noise without reducing the sterilization ability, and achieve electrical isolation to improve work safety.

[0181] Exemplarily, the electronic device may be an air conditioner. The air conditioner is used to adjust the temperature, humidity, etc. of the environment. The air conditioner may be a cooling-only air conditioner or a cooling-heating dual-purpose air conditioner. The air conditioner may be a wall-mounted air conditioner, a cabinet-type air conditioner, a window-type air conditioner, or a ceiling-mounted air conditioner, etc., which is not specifically limited in the embodiments of the present application.

[0182] Exemplarily, the streamer sterilization device can be arranged in the air duct of the air conditioner, and can utilize the free radicals and highly oxidizing molecules generated by dielectric barrier discharge to eliminate bacteria in the air duct and indoor environment, thereby purifying the air well.

[0183] It is understandable that, in other embodiments, the electronic device may also be an electronic device with air purification function such as a fresh air blower.

[0184] In an exemplary embodiment, the present application embodiment further provides a storage medium, namely a computer storage medium, which can be a computer-readable storage medium, for example, a memory storing a computer program, and the computer program can be executed by a microprocessor of the streamer sterilization device to complete the steps described in the method of the present application embodiment. The computer-readable storage medium can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disc, or a read-only optical disc (CD-ROM); the magnetic surface memory can be a disk memory or a tape memory.

[0185] It should be noted that: "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0186] In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0187] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A streamer sterilization device, characterized in that: include: A power drive circuit for boosting voltage, a plasma generator operating based on a drive power output by the power drive circuit, and an environment detection circuit for detecting environmental parameters; The power drive circuit comprises: a boost circuit and a microcontroller; the low-voltage side power supply is boosted by the boost circuit and supplies power to the positive electrode of the plasma generator; Among them, the microcontroller has a first port for outputting a first pulse width modulation (PWM) signal, and the input side of the boost circuit is provided with a first switch tube for conduction control based on the first PWM signal; the microcontroller also receives a parameter value of at least one environmental parameter of the current environment detected by the environmental detection circuit.

2. The device according to claim 1, characterized in that The device also includes: The voltage doubler circuit is arranged between the output side of the voltage booster circuit and the positive electrode of the plasma generator.

3. The device according to claim 2, characterized in that The boost circuit includes: a transformer, the first switch tube is arranged on the primary winding side of the transformer, and the voltage doubling circuit is arranged between the secondary winding of the transformer and the positive electrode of the plasma generator.

4. The device according to claim 3, characterized in that The microcontroller further has a second port for outputting a second PWM signal, and the input side of the boost circuit is further provided with a second switch tube for conducting control based on the second PWM signal; The primary winding of the transformer includes a first primary winding and a second primary winding, the first primary winding is connected to the first switch tube, the second primary winding is connected to the second switch tube, and the number of coil turns of the first primary winding is less than the number of coil turns of the second primary winding.

5. The device according to claim 1, characterized in that The plasma generator comprises a positive electrode, a first negative electrode and a second negative electrode, the positive electrode is located between the first negative electrode and the second negative electrode, and the distance between the first negative electrode and the positive electrode is smaller than the distance between the second negative electrode and the positive electrode; The microcontroller further comprises a third port for outputting a first electrical signal, and the first negative electrode is connected to a first relay for conducting control based on the first electrical signal; The microcontroller further includes a fourth port for outputting a second electrical signal, and the second negative electrode is connected to a second relay that performs conduction control based on the second electrical signal.

6. A control method for the streamer sterilization device according to any one of claims 1 to 5, characterized in that: include: Based on the parameter value of the at least one environmental parameter, the output voltage of the power driving circuit is adjusted.

7. The control method according to claim 6, characterized in that: The adjusting the output voltage of the power drive circuit based on the parameter value of the at least one environmental parameter comprises: If a parameter value of at least one environmental parameter is greater than or equal to a first set value, the output voltage of the power driving circuit is reduced based on the duty cycle of the first PWM signal and / or the second PWM signal.

8. The control method according to claim 7, characterized in that: The step of reducing the output voltage of the power driving circuit based on the duty cycle of the first PWM signal and / or the second PWM signal includes: When the first switch tube is turned on and the second switch tube is turned off, the duty cycle of the first PWM signal is controlled to decrease at a set rate until the output voltage of the power drive circuit decreases to a second set value; When the second switch tube is turned on and the first switch tube is turned off, the duty cycle of the second PWM signal is controlled to decrease at a set rate until the output voltage of the power drive circuit decreases to the second set value.

9. The control method according to claim 7, characterized in that: The step of reducing the output voltage of the power driving circuit based on the duty cycle of the first PWM signal and / or the second PWM signal includes: When the first switch tube is turned on and the second switch tube is turned off, the first switch tube is controlled to be turned off based on the first PWM signal, and the second switch tube is controlled to be turned on based on the second PWM signal, so as to reduce the step-up ratio of the transformer.

10. The control method according to claim 6, characterized in that: The method further comprises: When the first relay is closed and the second relay is open, if the parameter value of at least one environmental parameter is greater than or equal to a first set value, the first relay is controlled to be open based on the first electrical signal, and the second relay is controlled to be closed based on the second electrical signal, so that the inter-pole distance of the plasma generator is increased.

11. A streamer sterilization device as claimed in any one of claims 1 to 5, characterized in that: The microcontroller is configured to perform the method according to any one of claims 6 to 10.

12. An electronic device, characterized in that: include: The streamer sterilization device as claimed in claim 11.

13. The electronic device according to claim 12, characterized in that: The electronic device is an air conditioner.

14. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 6 to 10 are implemented.

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