Driving circuit, air purification device, air treatment equipment and method

Abstract

The embodiment of the invention provides a driving circuit, an air purification device, air treatment equipment and a method, and relates to the technical field of plasmas, and the driving circuit comprises a booster circuit which comprises an input end used for being electrically connected with a power supply; the first switching device is configured to connect and disconnect the input end with a power supply; the output end is used for being electrically connected with the plasma module and is configured to send a driving voltage signal to drive the plasma module to generate plasma when the input end is connected with a power supply, and the driving voltage signal is formed by boosting the input voltage received by the input end; and the control circuit is electrically connected to the first switching device and is configured to control the first switching device to alternately connect and disconnect the input end and the power supply so as to enable the output end to intermittently send the driving voltage signal. Therefore, the plasma module is driven to intermittently generate plasmas, and ozone accumulation caused by long-time continuous ionization of the plasma module can be effectively relieved.

Description

Technical Field

[0001] The present invention relates to plasma technology, and more particularly to a driving circuit, an air purification device, an air treatment device and a method. Background Art

[0002] Plasma is the fourth state of matter besides gas, liquid and solid. Gaseous matter is ionized by acquiring energy and thus converted into plasma. Plasma is a system composed of charged particles (including ions, electrons, and ion clusters) and neutral particles. It is a state of matter with rich species and high activity.

[0003] Thanks to the characteristics of plasma, plasma technology has been widely used in various fields. For example, plasma technology can be used in the field of household appliances for air purification and sterilization; in the industrial field, plasma technology can be used for disinfection, wastewater treatment, waste gas treatment, etc.; in the logistics field, plasma technology can be applied to the preservation of cold chain transportation, etc. In order to generate plasma, the relevant equipment needs to be equipped with a plasma module.

[0004] Since the plasma module produces ozone in the process of generating plasma, when the equipment equipped with the plasma module runs for a long time, the plasma module will continue to generate plasma and ozone, resulting in ozone accumulation. Excessive ozone concentration may have adverse effects on human health. Summary of the invention

[0005] The embodiments of the present disclosure provide a driving circuit, an air purification device, an air treatment device, and a method for a plasma module, which can effectively alleviate the ozone accumulation caused by the plasma module without affecting the normal operation of the equipment.

[0006] In a first aspect, an embodiment of the present disclosure provides a driving circuit of a plasma module, comprising:

[0007] A boost circuit comprises: an input end for electrically connecting to a power supply; a first switch device configured to connect and disconnect the input end to the power supply; an output end for electrically connecting to the plasma module, configured to send a driving voltage signal to drive the plasma module to generate plasma when the input end is connected to the power supply, wherein the driving voltage signal is boosted by an input voltage received by the input end; and a control circuit electrically connected to the first switch device, configured to control the first switch device to alternately connect and disconnect the input end to the power supply so that the output end intermittently sends the driving voltage signal.

[0008] In a second aspect, an embodiment of the present disclosure provides an air purification device, comprising the driving circuit in the above embodiment and a plasma module electrically connected to the output end.

[0009] In a third aspect, an embodiment of the present disclosure provides an air treatment device, including the air purification device in the above embodiment.

[0010] In a third aspect, an embodiment of the present disclosure provides a control method for a plasma module, comprising: using a boost circuit to boost an input voltage to a driving voltage signal for driving the plasma module to generate plasma; processing the boost process of the input voltage based on a pre-generated control signal, so that the boost circuit is alternately started and stopped and intermittently sends a driving voltage signal to the plasma module, so as to achieve intermittent generation of plasma by the plasma module.

[0011] Compared with the related art, the driving circuit and control method of the plasma module provided in the embodiment of the present disclosure control the first switching device through the control circuit to alternately connect and disconnect the input end of the boost circuit to the power supply, so that the output end of the boost circuit can intermittently send the driving voltage signal to the plasma module, thereby driving the plasma module to intermittently generate plasma, which can effectively alleviate the ozone accumulation caused by the continuous ionization of the plasma module and reduce the ozone concentration in the environment. Other features and advantages of the present disclosure will be described in the subsequent description, and partly become apparent from the description, or be understood by implementing the present disclosure. Other advantages of the present disclosure can be achieved and obtained through the schemes described in the description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure.

[0013] Figure 1 is a schematic diagram of an embodiment of a driving circuit of a plasma module disclosed in the present invention;

[0014] Figure 2 is a schematic diagram of another embodiment of a driving circuit of a plasma module disclosed in the present invention;

[0015] Figure 3 A control logic diagram of a plasma module in the related art;

[0016] Figure 4 A control logic diagram of a control method for a plasma module disclosed in the present invention;

[0017] Figure 5 A schematic flow chart of an embodiment of a method for controlling a plasma module disclosed herein;

[0018] Figure 6A waveform diagram of a method for controlling a plasma module disclosed in the present invention when a pulse signal is used to process a voltage boosting process;

[0019] Figure 7 This is a waveform diagram of a method for controlling a plasma module disclosed herein when a half-sine wave signal is used to process a voltage boost process;

[0020] Figure 8 A waveform diagram of a control method for a plasma module disclosed in one embodiment of the present invention when a trapezoidal wave signal is used to process a voltage boost process;

[0021] Fig. 9 This is a waveform diagram of a voltage boost process using a modified sine wave signal in an embodiment of a plasma module control method disclosed herein.

[0022] Description of reference numerals:

[0023] 110 - boost circuit; 111 - oscillation circuit; 120 - control circuit. DETAILED DESCRIPTION

[0024] The present disclosure describes multiple embodiments, but the description is exemplary rather than restrictive, and it is apparent to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present disclosure. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0025] The present disclosure includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features, and elements disclosed in the present disclosure may also be combined with any conventional features or elements to form a unique invention scheme defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present disclosure may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other limitations. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0026] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps in the specific order described. As will be appreciated by those of ordinary skill in the art, other orders of steps are also possible. Therefore, the specific order of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps performed in the order written, and those skilled in the art can easily understand that these orders can be changed and still remain within the spirit and scope of the disclosed embodiments.

[0027] At present, there are two ways for plasma modules to generate plasma: high-voltage pulse corona discharge (CD) and dielectric barrier discharge (DBD). Among them, high-voltage pulse corona discharge uses DC high voltage to generate intense high-frequency corona discharge, and the gas in the space will quickly become a high-concentration plasma. In this process, the air is broken down by high voltage, and ozone will be produced while sterilizing.

[0028] Dielectric barrier discharge is the process of applying an AC voltage between two electrodes separated by an insulating dielectric barrier layer, which causes the gas in the space to be ionized. This ionization process can kill bacteria and disinfect, and also produces ozone.

[0029] In the related art, a boost circuit is usually set in the driving circuit of the plasma module, and the input voltage is boosted to generate a high-voltage signal for driving the plasma module, thereby driving the plasma module to generate plasma. Since the voltage input to the driving circuit is usually supplied by the device where the plasma module is located, the operation and stop of the plasma module are usually synchronized with the opening and closing of the device. When the device is running for a long time, the plasma module also continues to generate plasma, which leads to the continuous accumulation of ozone generated by ionization, thereby causing safety hazards.

[0030] In view of this, the inventors of the present disclosure have improved the driving circuit of the plasma module.

[0031] The present embodiment proposes an air purification device, which includes a plasma module and a driving circuit. The plasma module includes a first electrode and a second electrode, and the first electrode and the second electrode are arranged at intervals. An insulating medium can also be arranged between the first electrode and the second electrode. The driving circuit is electrically connected to the plasma module. The driving circuit sends a driving voltage signal to the plasma module, and the driving voltage signal is a voltage signal, which can load a voltage difference between the first electrode and the second electrode so that the first electrode and the second electrode ionize the air to generate plasma. When the plasma module generates plasma, a large amount of electrons, hydroxyl radicals, reactive oxygen species (Reactive Oxygen Species, ROS), reactive nitrogen (Reactive Nitrogen Species, RNS) and other high-energy particles are released, and high-energy particles can have a good killing effect on bacteria and viruses, and can also play a good role in decomposing and purifying odors in the air.

[0032] Figure 1 A schematic diagram of an embodiment of a driving circuit of a plasma module of the present disclosure is shown. Figure 1 As shown, the driving circuit includes a power source E, a boost circuit 110 and a control circuit 120 .

[0033] The boost circuit 110 is used to convert the input voltage into a driving voltage signal. The boost circuit 110 includes an input terminal A, a first switching device Q1 and an output terminal B. The input terminal A is electrically connected to a power source E. The input terminal A is electrically connected to the power source E, and the power source E provides an input voltage for the boost circuit 110. The first switching device Q1 is arranged at the input terminal A, and can connect and disconnect the input terminal A with the power source E. The output terminal B is electrically connected to the plasma module. The boost circuit 110 can convert the input voltage input from the power source E into a driving voltage signal. The output terminal B is configured to send a driving voltage signal to drive the plasma module to generate plasma when the input terminal A is connected to the power source E.

[0034] The power source E can be an AC power source or a DC power source. When the power source E is an AC power source, the input voltage of the boost circuit 110 is an AC voltage, and the boost circuit 110 can directly boost the input voltage and convert it into a driving voltage signal. When the power source E is a DC power source, the input voltage of the boost circuit 110 is a DC voltage, and the boost circuit 110 can convert the input voltage into an AC voltage, and then boost the AC voltage and convert it into a driving voltage signal. The control circuit 120 is electrically connected to the first switching device Q1. The control circuit 120 controls the first switching device Q1 to alternately connect and disconnect the input terminal A and the power source E, so that the output terminal B intermittently sends a driving voltage signal.

[0035] The first switch device Q1 may be a triode or a field effect transistor (Metal-Oxide-SemiconductorField-Effect Transistor, MOS). The control circuit 120 may input a control signal into the first switch device Q1, thereby controlling the first switch device Q1 to alternately connect and disconnect the input terminal A and the power source E. The control signal may be a current signal or a voltage signal.

[0036] The driving circuit of the plasma module provided in this embodiment controls the first switching device Q1 through the control circuit 120 to alternately connect and disconnect the input end of the boost circuit 110 to the power supply E, and the boost circuit 110 is intermittently powered on and off, so that the output end B of the boost circuit 110 can intermittently send a driving voltage signal to the plasma module, thereby driving the plasma module to intermittently generate plasma, which can effectively suppress the accumulation of ozone caused by long-term continuous ionization of the plasma module, reduce the ozone concentration in the environment, and will not affect the air purification effect of the plasma module.

[0037] In an illustrative embodiment, the boost circuit 110 further includes a boost transformer T. The boost transformer T includes a primary coil L1 and a secondary coil L2. The primary coil L1 and the secondary coil L2 are mutually inductive. The number of turns of the primary coil L1 is less than the number of turns of the pole coil L2. The primary coil L1 is electrically connected to the input terminal A. The output terminal B is the two ends of the secondary coil L2, and the two ends of the secondary coil L2 are electrically connected to the first electrode and the second electrode of the plasma module respectively.

[0038] The primary coil L1 is used to load an alternating current. When the power source E is an AC power source, the alternating current loaded on the primary coil L1 can be directly provided by the power source E; when the power source E is a DC power source, the alternating current loaded on the primary coil L1 can be an alternating current obtained by inverting the DC power provided by the power source E.

[0039] When the alternating current is loaded on the primary coil L1, the secondary coil L2 will also generate an electromotive force due to electromagnetic induction, so that the output terminal B can output an alternating driving voltage signal, and the voltage of the driving voltage signal is greater than the voltage across the primary coil L1. When the alternating current on the primary coil L1 is cut off, the output terminal B stops outputting the alternating driving voltage signal.

[0040] The first switch device Q1 can control the on and off of the alternating current on the primary coil L1 by controlling the on and off of the input terminal and the power supply, and further control whether the output terminal B sends a driving voltage signal.

[0041] In an illustrative embodiment, the boost circuit 110 implements the input voltage boost processing through the boost transformer T, and alternately connects and disconnects the input terminal A and the power supply E through the first switching device Q1, so that the alternating current on the primary coil L1 can be alternately turned on and off, thereby enabling the output terminal B to intermittently send out a driving voltage signal.

[0042] In an illustrative embodiment, the control circuit 120 is configured to send a control signal to the first switching device Q1. The control signal is a fluctuating signal, and the amplitude of the control signal changes over time. The amplitude of the control signal alternates between being greater than or equal to a preset threshold and being less than a preset threshold, that is, the amplitude of the control signal fluctuates above and below the preset threshold. The control signal may be a voltage signal, and the preset threshold may be a turn-on voltage of the first switching device Q1. The preset threshold may be zero.

[0043] The first switch device Q1 can indirectly control the magnitude of the alternating current on the primary coil L1 by controlling the magnitude of the current flowing through the input terminal, and the current value of the input terminal is positively correlated with the current value of the alternating current on the primary coil L1. The first switch device Q1 is configured to make the maximum current value of the alternating current on the primary coil L1 positively correlated with the amplitude when the amplitude of the received control signal is greater than or equal to the preset threshold, and cut off the alternating current when the amplitude of the control signal is less than the preset threshold.

[0044] In this embodiment, the first switch device Q1 can control the alternating current according to the waveform of the control signal. When the amplitude of the control signal is greater than or equal to the preset threshold, the first switch device Q1 connects the boost circuit 110 and the power supply E, and controls the maximum current of the alternating current in the primary coil L1 according to the amplitude of the control signal. Controlling the maximum current of the alternating current can further control the electromotive force at both ends of the secondary coil L2, that is, the voltage of the driving voltage signal, and the voltage of the driving voltage signal is positively correlated with the maximum current of the alternating current in the primary coil L1. Thus, the driving voltage signal output by the output terminal B of the boost circuit 110 has a waveform feature corresponding to the part of the control signal that is greater than or equal to the preset threshold, for example, the operating power of the plasma module is positively correlated with the amplitude of the control signal, and the operating cycle of the plasma module is consistent with the cycle of the control signal. When the amplitude of the control signal is less than the preset threshold, the output terminal B of the boost circuit 110 will not output the driving voltage signal, and at this time, the plasma module will no longer generate plasma. It is achieved to control the operating state of the plasma module according to the waveform feature of the control signal. In this way, the operating state of the plasma module can be adjusted by simply adjusting the parameters of the control signal according to demand.

[0045] At the same time, the amplitude of the control signal alternates between being greater than or equal to a preset threshold and being less than a preset threshold. When the control signal is transmitted to the first switching device Q1, the alternating current on the primary coil L1 can be alternately turned on and off, so that the output terminal B of the boost circuit 110 intermittently outputs a driving voltage signal, thereby controlling the plasma module to intermittently generate plasma.

[0046] In an illustrative embodiment, the control signal may be a voltage signal, the first switch device Q1 may be a transistor or a MOS transistor, and the preset threshold is the turn-on voltage of the first switch device Q1. When the voltage amplitude of the control signal reaches the turn-on voltage of the first switch device Q1, the first switch device Q1 is turned on, and the boost circuit 110 can receive the input voltage from the power supply E; when the voltage amplitude of the control signal is less than the turn-on voltage, the first switch device Q1 cannot be turned on, and the boost circuit 110 is disconnected from the power supply E. The on-off control of the boost circuit and the power supply can be realized by utilizing the inherent characteristics of the transistor, which can simplify the circuit and reduce the manufacturing cost of the drive circuit.

[0047] In an illustrative embodiment, the control signal may be a pulse signal. In a pulse cycle, when the voltage amplitude of the control signal reaches the turn-on voltage of the first switch device Q1, the output terminal B of the boost circuit 110 outputs a driving voltage signal to the plasma module to drive the plasma module to generate plasma, and gradually increases the operating power of the plasma module as the voltage amplitude increases, until the voltage amplitude of the control signal is less than the turn-on voltage of the first switch device, the output terminal B of the boost circuit 110 no longer outputs a driving voltage signal to the plasma module, and the plasma module no longer generates plasma. In this way, the operating state of the plasma module can be adjusted by simply adjusting the parameters of the pulse signal. For example, reducing the frequency of the pulse signal can reduce the operating frequency of the plasma module; increasing the pulse width of the pulse signal can increase the operating time and stop time of the plasma module in an operating cycle, and so on.

[0048] In an illustrative embodiment, the pulse signal may be a rectangular wave signal. When the pulse signal is at a high level, the output terminal B of the boost circuit 110 may continuously output a driving voltage signal to drive the plasma module to continuously generate plasma; when the pulse signal is at a low level, the output terminal of the boost circuit 110 no longer outputs a driving voltage signal or the output voltage is less than the operating voltage of the plasma module, and the plasma module no longer generates plasma at this stage. It can be seen that the plasma module can be controlled to continue to operate periodically by a rectangular wave, and in practice, the operating state of the plasma module can be adjusted by changing the parameters of the rectangular wave (such as duty cycle, pulse width, etc.), and the plasma module can be controlled more flexibly.

[0049] In an illustrative embodiment, the rising edge of the pulse signal gradually increases with time. When the amplitude of the pulse signal gradually increases with time, the voltage outputted by the output terminal B of the boost circuit 110 (i.e., the driving voltage signal) also gradually increases with time, thereby avoiding the adverse effect of instantaneous high voltage on the service life of the plasma module.

[0050] As an example, the pulse signal can be a half-sine wave signal, a trapezoidal wave signal, a sawtooth wave signal or a half-modified sine wave signal. Among them, the half-modified sine wave can control the rising trend of the driving voltage signal by adjusting the rising edge, which can improve the control flexibility of the plasma module.

[0051] Reference below Figure 2 , Figure 2 A schematic diagram showing another embodiment of a driving circuit of a plasma module of the present disclosure is shown. Figure 2 As shown, the input end of the boost circuit 110 includes a positive input terminal A1 and a negative input terminal A2. The power supply E is a DC power supply, which can be a DC power supply provided by the mainboard of the air handling device. The positive pole of the voltage E is electrically connected to the positive input terminal A1, and the negative pole of the voltage E is electrically connected to the negative input terminal A2. The negative pole of the voltage E and the negative input terminal A2 of the boost circuit 110 can be electrically connected to each other by being connected to a reference ground. The first switching device Q1 includes a first collector c1, a first emitter e1 and a first base b1. The first emitter e1 is electrically connected to the negative input terminal A2. The first base b1 is electrically connected to the control circuit 120.

[0052] The boost circuit 110 further includes an oscillating circuit 111. The oscillating circuit 111 includes a second switching device Q2, an inductor L3, a capacitor C, and a first resistor R1. The oscillating circuit 111 includes a second collector c2, a second emitter e2, and a second base b2. The second emitter e2 is electrically connected to the first collector c1. One end of the inductor L3 is electrically connected to the second collector c2, and the other end of the inductor L3 is electrically connected to one end of the capacitor C. One end of the first resistor R1 is electrically connected to the other end of the capacitor C, and the other end of the first resistor R1 is electrically connected to the second base b2.

[0053] Both ends of the primary coil L1 are electrically connected to the second collector c2 and the positive input terminal A1, respectively.

[0054] In this embodiment, the power source E is a DC power source, and a DC voltage is applied between the positive input terminal A1 and the negative input terminal A2. The oscillation circuit 111 is a self-excited oscillation circuit, and the alternating charge and discharge of the capacitor C and the inductor L3 can cause the current in the primary coil L1 to oscillate and generate an alternating current, and then an induced current can be generated in the secondary coil L2 through mutual inductance, thereby generating a high voltage driving voltage signal at the output terminal B.

[0055] The driving circuit of the plasma module in this embodiment can be directly applied to various air treatment equipment. By connecting the DC power supply provided by the mainboard of the air treatment equipment to the driving circuit, the plasma module can be controlled, which helps to expand the application field of the driving circuit of the plasma module.

[0056] In some optional implementations of this embodiment, the control circuit 120 includes a signal generator M and a second resistor R2. The signal generator M is provided with a signal output terminal. One end of the second resistor R2 is electrically connected to the signal output terminal, and the other end of the second resistor R2 is electrically connected to the first base b1.

[0057] In this embodiment, the signal generator M can directly generate the control signal, for example, the signal generator M can also include a microcontroller unit (MCU), which generates the corresponding control signal by executing a preset code. The second resistor R2 can be used as a current limiting resistor to reduce the current between the first base b1 and the first emitter e1 in the first switching device Q1 to prevent the first switching device Q1 from being damaged.

[0058] In some other optional implementations, the control circuit 120 further includes a third resistor R3. Two ends of the third resistor are electrically connected to the first base b1 and the negative input terminal A2 respectively.

[0059] In this embodiment, the third resistor R3 is a pull-down resistor. By changing the resistance values ​​of the second resistor R2 and the third resistor R3, the waveform of the control signal output by the signal generator M can be adjusted, so that the waveform of the control signal received by the first base b1 is different from the waveform of the control signal output by the signal generator M, thereby changing the waveform of the driving voltage signal. For example, the control signal waveform output by the signal generator M is a half-sine wave. By adjusting the resistance values ​​of the second resistor and the third resistor, the voltage rise time and fall time of the half-sine wave of the control signal can be shortened and the peak part can be widened to change the shape of the control signal waveform so that the control signal waveform received by the first base b1 is a half-modified sine wave.

[0060] The driving circuit of the plasma module in this embodiment can be in the form of an independent package, and is electrically connected to the plasma module and the power supply (external power supply or mainboard power supply of the air treatment device where the plasma module is located). Alternatively, the driving circuit of the plasma module can also be a part of the mainboard of the air treatment device where the plasma module is located or the mainboard of the plasma module. This disclosure is not limited to this.

[0061] Based on the driving circuit of the plasma module in any of the above embodiments, the inventors of the present disclosure have also improved the control method of the plasma module. Figure 3The control logic of the plasma module in the related art is shown. Figure 4 The control logic of the plasma module control method disclosed in the present invention is shown.

[0062] like Figure 3 As shown, the 12V DC voltage provided by the DC power supply (usually the mainboard power supply of the air handling equipment where the plasma module is located) can obtain a high voltage of 3000V to 6000V after being boosted by the boost circuit, and then the high voltage is provided to the plasma module so that the plasma module can use the high voltage to ionize the air and generate plasma.

[0063] like Figure 4 As shown, the control method of the plasma module provided in the embodiment of the present disclosure can process the boosting process of the DC voltage through the control signal to obtain a driving voltage signal with a waveform characteristic corresponding to the control signal, and then use the driving voltage signal to drive the plasma module to operate, so that the plasma module can periodically generate plasma according to the waveform characteristics of the control signal. In this way, when the air treatment equipment where the plasma is located is operating normally, the operation and stop of the plasma module can be independently controlled, thereby effectively alleviating ozone accumulation and reducing the ozone concentration in the environment.

[0064] Reference below Figure 5 , Figure 5 FIG. 1 is a flow chart of an embodiment of a method for controlling a plasma module disclosed in the present invention. Figure 5 As shown, the process includes the following steps.

[0065] Step 510: Use the boost circuit 110 to boost the input voltage to a driving voltage signal for driving the plasma module to generate plasma.

[0066] In this embodiment, the input end of the boost circuit 110 can be connected to an input voltage, and after the boost process, a high voltage of 3000V to 6000V can be obtained at the output end of the boost circuit 110 .

[0067] Generally, the boost circuit 110 can be packaged in the form of a high voltage package. As an example, the boost circuit 110 adopts Figure 1 or Figure 2 The circuit shown may also be an inverter power supply circuit, a self-excited oscillation circuit or other circuits with a voltage-boosting function.

[0068] Step 520: Process the boosting process of the input voltage based on the pre-generated control signal, so that the boosting circuit 110 is alternately started and stopped to intermittently send a driving voltage signal to the plasma module, so that the plasma module intermittently generates plasma.

[0069] In this embodiment, the control signal refers to a voltage or current signal that can act on the boost circuit 110. For example, the control signal can be a voltage signal to control the start or stop of the boost circuit 110. When the voltage amplitude in the control signal reaches the start voltage of the boost circuit 110, the boost circuit 110 performs a boost process on the input voltage; when the voltage amplitude of the control signal is lower than the start voltage of the boost circuit 110, the boost circuit 110 no longer performs a boost process. In this way, the boost circuit 110 can be controlled to intermittently output a high voltage.

[0070] As an example, the control signal can be a periodic signal, for example, a signal pre-modulated according to demand, a function signal generated by a microcontroller unit, or other periodic signals. The control signal is used to process the boost process, and the waveform characteristics of the control signal can be coupled to the drive voltage signal, so that the drive voltage signal can have a waveform characteristic corresponding to the control signal. For example, the control signal can be used as a fundamental wave, and the high-voltage signal output by the boost circuit 110 can be used as a carrier wave, so that the waveform characteristics of the fundamental wave in the drive voltage signal obtained are consistent with the control signal. When the drive voltage signal is subsequently used to drive the plasma module, the operating state of the plasma module can be controlled according to the waveform characteristics of the control signal.

[0071] In some examples, the high voltage signal output by the boost circuit 110 may be an AC voltage, the frequency of which is greater than the frequency of the periodic control signal, or the period of which is less than the period of the periodic control signal. In one period of the control signal, the time period in which the boost circuit 110 is started once may contain multiple periods of the AC voltage.

[0072] For another example, the control signal may also be a current signal, which controls the boost effect of the boost circuit 110 by changing the current in the boost circuit 110, so that the voltage output by the boost circuit 110 can change within a preset range along with the waveform of the control signal, thereby obtaining a driving voltage signal having a waveform characteristic corresponding to the control signal.

[0073] Taking air conditioners as an example, a plasma module can be installed at the air outlet of the indoor unit of the air conditioner, and a plasma module can be installed inside the air conditioner. Figure 1 or Figure 2The driving circuit shown in one example provides a 12V DC voltage to the driving circuit through the air conditioner mainboard. The plasma module can generate plasma by dielectric barrier discharge. For example, a 0.254mm alumina ceramic sheet can be used as a dielectric material layer. The first electrode and the second electrode are respectively provided on opposite sides of the dielectric material layer. The first electrode and the second electrode can be constructed as a metal layer. The material for making the first electrode and the second electrode can be a mixture of metal nickel oxides. The thickness of the first electrode and the second electrode can be 0.02mm. The first electrode and / or the second electrode can be set to a pattern, text or a combination of the two as required, for example, it can be set to the name of the manufacturer. A protective layer can also be covered on the first electrode and / or the second electrode. The protective layer can be a transparent glass glaze with a thickness of 50um, and the length and width of the plasma module are approximately 80mm*20mm.

[0074] When the air conditioner is turned on, the 12V DC voltage provided by the air conditioner mainboard can generate an alternating current using an oscillation circuit and input the boost circuit 110, so that the input end of the boost circuit 110 obtains the input voltage. At the same time, the control circuit can be used to access a control signal with a frequency of 0.1Hz at the control end of the boost circuit 110 (for example, a manually modulated signal or a function signal such as a sine wave or a triangular wave), and the boost process is processed by the control signal, so that the fundamental frequency of the driving voltage signal obtained at the output end of the boost circuit 110 is also 0.1Hz. After that, the driving voltage signal is used to drive the plasma module to run, so that the plasma module can be shut down for a second and start for b seconds with a cycle of 10 seconds, where a+b=10. After measurement and comparison, the air conditioner continues to work for the same time, and the ozone generation of the plasma module in this example is only 30% to 40% of the plasma module in the related art.

[0075] Of course, in this example, the voltage value provided to the driving circuit, the material and size of the plasma module, the frequency and cycle of the control circuit, the start and stop time, etc. are not limited to the above specific values, and the above parameters are only examples.

[0076] The control method of the plasma module in this embodiment can utilize a pre-generated control signal to process the boost process, so that the boost circuit 110 can intermittently output a driving voltage signal, thereby controlling the intermittent operation of the plasma module, which can effectively alleviate the ozone accumulation phenomenon and will not affect the normal operation of the air treatment equipment where the plasma module is located.

[0077] In addition, the plasma module will emit light itself during discharge, and the intensity of the light can change with the size of the driving voltage. By controlling the start or stop of the boost circuit 110 through a control signal and designing the waveform of the control signal, a breathing light visual effect can be produced, thereby realizing the visualization of the working status of the plasma module.

[0078] In some optional implementations of this embodiment, the control signal may be a pulse signal. In this case, the above step 520 may include: connecting the pulse signal to the control end of the boost circuit 110; and using the pulse signal to control the opening and closing of the input end.

[0079] Combination Figure 1 For example, the control circuit can be connected to the boost circuit 110 through the first switch element Q1 . In this case, the first base b1 of the first switch element Q1 is the control terminal of the boost circuit 110 .

[0080] For example, in Figure 2 In the example shown, the first base b1 is the control terminal of the boost circuit 110 .

[0081] Figure 6 The waveform diagram and circuit diagram of the boosting process using a pulse signal in this embodiment are shown, wherein the power source E can be the mainboard power source of the air treatment device where the plasma module is located, and the oscillating circuit can provide an alternating current to the input end of the boosting circuit 110. The boosting circuit 110 can be used Figure 1 or Figure 2 The structure shown will not be described in detail here.

[0082] The signal generator M can generate a pulse signal 621, and the pulse signal 621 is connected to the first switch circuit Q1. The first switch circuit Q1 can be a triode or a MOS tube (positive channel Metal Oxide Semiconductor, metal oxide semiconductor field effect transistor). The first switch circuit Q1 controls the opening and closing of the boost circuit 110, so that the output end of the boost circuit 110 can obtain a driving voltage signal 631. It can be seen from the figure that the fundamental wave of the driving voltage signal 631 is in the same frequency and phase as the pulse signal 621. It can be understood that when the plasma module is driven by the driving voltage signal 631, when the pulse signal 621 is in a high level stage, the plasma module can generate plasma; when the pulse signal 621 is in a low level stage, the plasma module no longer generates plasma.

[0083] In the process of implementing the present disclosure, the inventors also found that the instantaneous high voltage when the plasma module starts ionization will cause a large impact on the electrode material and the dielectric material, thereby causing adverse effects on the service life of the plasma module.

[0084] In response to the above problem, in some embodiments of the present disclosure, the rising edge of the control signal gradually increases over time.

[0085] When the boosting process is processed by the control signal, the voltage output by the boosting circuit 110 can be gradually increased over time to drive the plasma module, thereby avoiding the impact of instantaneous high voltage on the plasma module and helping to increase the service life of the plasma module.

[0086] At this time, the above step 520 may include: connecting the control signal to the control end of the boost circuit 110; and controlling the current in the input end by using the control signal.

[0087] As an example, the control signal can be connected to the boost circuit 110 through the first switching device Q1 to control the current in the input end of the boost circuit 110, thereby obtaining a driving voltage signal corresponding to the rising edge of the control signal, so that the voltage output by the boost circuit 110 gradually increases over time to avoid generating instantaneous high voltage.

[0088] As an example, the control signal may be a half-sine wave signal or a trapezoidal wave signal.

[0089] Figure 7 The waveform diagram and circuit diagram of using a half-sine wave signal to process the boost process in some embodiments of the present disclosure are shown, such as Figure 7 As shown, the power source E may be the mainboard power source of the air handling device where the plasma module is located. The signal generator M may generate a half-sine wave signal 721, and then connect the half-sine wave signal 721 to the control end of the boost circuit 110 through the first switch device Q1. By controlling the current in the oscillation circuit of the boost circuit 110, the output voltage of the boost circuit 110 may be controlled, thereby obtaining a driving voltage signal 741. In subsequent steps, when the driving voltage signal 741 is used to drive the plasma module, the voltage may be gradually increased to a voltage threshold required for ionization (for example, it may be a breakdown voltage of the plasma module), at which point the plasma module begins to generate plasma until the voltage is gradually reduced to below the voltage threshold, and the plasma module stops generating plasma.

[0090] Figure 8 The waveform diagram and circuit diagram of using a trapezoidal wave signal to process the boost process in some embodiments of the present disclosure are shown, such as Figure 8 As shown, the power source E can be the mainboard power source of the air treatment device where the plasma module is located. The signal generator M can generate a trapezoidal wave signal 821, and then connect the trapezoidal wave signal 821 to the control end of the boost circuit 110 through the first switch device Q1, and control the output voltage of the boost circuit 110 by controlling the current in the induction coil of the boost circuit 110, thereby obtaining a driving voltage signal 841. Figure 7Compared with the half-sine wave signal shown in FIG. 8 , when the trapezoidal wave signal 821 is used as the control signal, the output voltage of the boost circuit 110 can be controlled to increase linearly from a low voltage to a high voltage and maintain the high voltage for a specific time.

[0091] In this embodiment, a half-sine wave signal or a trapezoidal wave signal is used as a control signal to control the output voltage of the boost circuit 110 to gradually increase to a peak value and then gradually decrease, so as to drive the plasma module to operate. This can not only avoid the adverse effects of instantaneous high voltage on the life of the plasma module, but also because the transition of the half-sine wave signal and the trapezoidal wave signal at the peak is smoother, the plasma module can run more smoothly, which helps to further improve the service life of the plasma module.

[0092] In some embodiments, the control signal may also be a semi-modified sine wave signal.

[0093] Reference below Fig. 9 , Fig. 9 The waveform diagram and circuit diagram of the boost process using the semi-modified sine wave signal in this embodiment are shown. Fig. 9 As shown, the power source E can input an alternating current to the boost circuit 110. The control circuit 120 can generate a semi-corrected sine wave signal, and connect the semi-corrected sine wave signal to the control terminal of the boost circuit 110 through the first switch device Q1 to control the output voltage of the boost circuit 110, thereby obtaining a driving voltage signal 941.

[0094] In this embodiment, a semi-modified sinusoidal wave signal is used to process the boost process, which can not only avoid the adverse effects of instantaneous high voltage on the service life of the plasma module, but also utilize the adjustable characteristics of the semi-modified sinusoidal wave signal waveform to adjust the operating state of the plasma module as needed, thereby helping to improve the flexibility of controlling the plasma module.

[0095] exist Fig. 9 In some optional implementations of the illustrated embodiment, the control method of the plasma module of the present disclosure may further include:

[0096] Generate a control signal with a half-sine wave waveform, and adjust the waveform of the control signal to a half-modified sine wave by adjusting at least one of the following waveform characteristics:

[0097] Rising edge slope, falling edge slope and peak waveform.

[0098] Continue to combine Fig. 9For example, the signal generator M generates a control signal 921 with a half-sine wave waveform. The waveform characteristics of the control signal 921 can be changed by adjusting the resistance value of the second resistor R2 and / or the second resistor R3, so that the waveform of the control signal input to the first base of the first switching device Q1 is adjusted to a half-modified sine wave. At least one of the rising edge slope, the falling edge slope and / or the peak waveform of the waveform characteristics of the control signal 921 with a half-sine wave waveform is changed so that the control signal 921 with a half-sine wave waveform is transformed into a control signal with a half-modified sine wave waveform.

[0099] As an example, the waveform characteristics of the control signal 921 may be adjusted according to equation (1).

[0100]

[0101] In the formula, Vout represents the output voltage of the boost circuit 110; Vin represents the output voltage of the signal generator M; Vb represents the on-voltage of the first switch device Q1; Qhef represents the gain of the first switch device Q1; Rload represents the load impedance at the output end of the boost circuit 110; and n represents the gain of the boost circuit 110.

[0102] In this embodiment, the waveform characteristics of the control signal 921 can be adjusted by adjusting the resistance value, thereby adjusting the waveform of the driving voltage signal 941, thereby changing the operating state of the plasma module, which helps to more flexibly control the operating state of the plasma module.

[0103] In some optional implementations of the above embodiments, the method may further include: adjusting the waveform characteristics of the control signal to change the operating state of the plasma module, and the parameters of the control signal include at least one of the following: period, pulse width, and frequency.

[0104] As an example, when the efficiency of plasma generation by the plasma module needs to be improved, the period of the control signal can be reduced, or the frequency of the control signal can be increased. When it is detected that the accumulated ozone concentration of the plasma module is high, the period of the control signal can be increased, or the frequency of the control signal can be reduced. When it is necessary to increase the operating time of the plasma module in each cycle, the pulse width of the control signal can be increased.

[0105] This embodiment also proposes an air treatment device, which can take in and out air, and has unlimited air treatment functions, for example, it can perform at least one of the air temperature adjustment, humidification, purification, circulation and other treatment functions. The air treatment device includes but is not limited to an air conditioner, and the air treatment device can also be a purifier, a humidifier, a fan, etc. After the specific type of the air treatment device is determined, those skilled in the art can know the composition of the air treatment function of the air treatment device, which will not be described in detail here.

[0106] The air treatment equipment includes a housing, a fan and the above-mentioned air purification device. The housing is provided with an air inlet, an air outlet and an air duct. The two ends of the air duct are respectively connected to the air inlet and the air outlet. The fan is arranged in the air duct. The fan can be a cross-flow fan or a centrifugal fan. After the fan is started, it can drive the air in the air duct to move from the air inlet to the air outlet, so that the air inlet sucks the air in the surrounding environment into the air duct, and the air flows through the air duct and then is discharged from the air outlet to the surrounding environment. The air purification device is arranged in the air inlet or the air duct.

[0107] In addition, an embodiment of the present disclosure further provides a computer storage medium for storing computer instructions, which, when executed, implement the control method of the plasma module in any of the aforementioned embodiments.

[0108] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

Claims

1. A driving circuit for a plasma module, characterized in that: include: A boost circuit, comprising: an input terminal for electrically connecting to a power source; a first switch device configured to connect and disconnect the input terminal to the power source; an output terminal for electrically connecting to the plasma module, configured to send a driving voltage signal to drive the plasma module to generate plasma when the input terminal is connected to the power source, wherein the driving voltage signal is boosted by an input voltage received by the input terminal; The control circuit is electrically connected to the first switch device and is configured to control the first switch device to alternately connect and disconnect the input terminal and the power supply so that the output terminal intermittently sends the driving voltage signal.

2. The driving circuit according to claim 1, characterized in that: The boost circuit also includes a boost transformer; The step-up transformer comprises a primary coil electrically connected to the input end and used for loading an alternating current, and a secondary coil having mutual inductance with the primary coil, and the output end is two ends of the secondary coil.

3. The driving circuit according to claim 2, characterized in that: The control circuit is configured to send a control signal to the first switching device, wherein the amplitude of the control signal alternately changes between being greater than or equal to the preset threshold and being less than the preset threshold; The first switching device is electrically connected to the primary coil and is configured to, based on the amplitude of the control signal being greater than or equal to a preset threshold, have the maximum current of the alternating current loaded to the primary coil be positively correlated with the amplitude of the control signal, and to cut off the alternating current based on the amplitude of the control signal being less than the preset threshold.

4. The driving circuit according to claim 3, characterized in that: The control signal is a voltage signal, and the preset threshold is a turn-on voltage of the first switch device.

5. The driving circuit according to claim 3, characterized in that: The control signal is a pulse signal.

6. The driving circuit according to claim 5, characterized in that: The rising edge of the pulse signal gradually increases with time.

7. The driving circuit according to claim 6, characterized in that: The pulse signal is a half-sine wave signal, a trapezoidal wave signal, a sawtooth wave signal or a half-modified sine wave signal.

8. The driving circuit according to claim 5, characterized in that: The pulse signal is a rectangular wave signal.

9. The driving circuit according to any one of claims 2 to 8, characterized in that: The input end includes a positive input terminal and a negative input terminal; The first switching device includes a first collector, a first emitter electrically connected to the negative input terminal, and a first base electrically connected to the control circuit; The boost circuit also includes an oscillation circuit, which includes: a second switching device, including a second collector, a second emitter electrically connected to the first collector, and a second base; an inductor, one end of which is electrically connected to the second collector; a capacitor, one end of which is electrically connected to the other end of the inductor; and a first resistor, one end of which is electrically connected to the other end of the capacitor and the other end of which is electrically connected to the second base; wherein the two ends of the primary coil are electrically connected to the second collector and the positive input terminal, respectively.

10. The driving circuit according to claim 9, characterized in that: The control circuit comprises: a signal generator provided with a signal output terminal; and A second resistor has one end electrically connected to the signal output terminal and the other end electrically connected to the first base.

11. The driving circuit according to claim 10, characterized in that: The control circuit further includes a third resistor, and two ends of the third resistor are electrically connected to the first base and the negative input terminal respectively.

12. The driving circuit according to claim 11, characterized in that: The signal output terminal outputs a control signal with a half-sine wave waveform. By adjusting the resistance value of the second resistor and / or the third resistor, at least one of the following waveform characteristics is adjusted to adjust the waveform of the control signal to a half-modified sine wave and input it to the first switching device: rising edge slope, falling edge slope and peak waveform.

13. An air purification device, characterized in that: The method comprises the driving circuit according to any one of claims 1 to 12 and a plasma module electrically connected to the output terminal.

14. An air treatment device, characterized in that: Comprising the air purification device as claimed in claim 13.

15. A method for controlling a plasma module, characterized in that: include: Using a boost circuit to boost the input voltage to a driving voltage signal for driving the plasma module to generate plasma; The boosting process of the input voltage is processed based on a pre-generated control signal, so that the boosting circuit is alternately started and stopped to intermittently send a driving voltage signal to the plasma module, so that the plasma module intermittently generates plasma.

16. The control method according to claim 15, characterized in that: The control signal is a pulse signal; The step of processing the input voltage boost process based on the pre-generated control signal includes: Connecting the control signal to the control end of the boost circuit; The control signal is used to control the opening and closing of the input terminal.

17. The method according to claim 16, characterized in that The step of processing the input voltage boost process based on the pre-generated control signal includes: Connecting the control signal to the control end of the boost circuit; The control signal is used to control the current in the input terminal, and the maximum current value of the current is positively correlated with the amplitude of the control signal.

18. The control method according to claim 17, characterized in that: The rising edge of the control signal gradually increases with time.

19. The control method according to claim 18, characterized in that: The control signal is a half-sine wave signal or a trapezoidal wave signal.

20. The control method according to claim 18, characterized in that: The control signal is a semi-modified sine wave signal.

21. The control method according to claim 20, characterized in that: The control method further includes: generating a control signal with a half-sine wave waveform, and adjusting the waveform of the control signal to a half-modified sine wave by adjusting at least one of the following waveform features: rising edge slope, falling edge slope, and peak waveform.

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