Plasma generation device, air conditioner, electronic equipment and circuit control method

Abstract

The embodiment of the invention discloses a plasma generating device, an air conditioner, electronic equipment and a circuit control method. The device comprises a signal generating circuit, an oscillating circuit, a voltage signal processing circuit and a plasma generator, wherein the signal generating circuit is used for outputting a driving signal; the oscillating circuit is used for receiving a direct-current voltage signal, converting the direct-current voltage signal into an alternating-current voltage signal based on the driving signal, and outputting the alternating-current voltage signal to the voltage signal processing circuit; and the voltage signal processing circuit is at least used for carrying out boosting processing on the alternating current voltage signal to obtain a first square wave pulse signal and outputting the first square wave pulse signal to the plasma generator.

Description

Technical Field

[0001] The present application relates to plasma technology, and in particular to a plasma generating device, an air conditioner, an electronic device and a circuit control method. Background Art

[0002] In the related art, a plasma generator can be used to purify the air, and can achieve powerful sterilization, purification, deodorization and other functions in the air. However, while the plasma generator ionizes the air and kills bacteria, it will produce ozone as a byproduct. Usually, the driving voltage of the plasma generator is a constant voltage. The higher the voltage of the plasma generator, the better the air ionization effect and the better the air purification effect, but the ozone concentration will also be higher. Summary of the invention

[0003] Embodiments of the present application provide a plasma generating device, an air conditioner, an electronic device, and a circuit control method.

[0004] The plasma generating device provided in the embodiment of the present application comprises: a signal generating circuit, an oscillation circuit, a voltage signal processing circuit and a plasma generator;

[0005] The signal generating circuit is used to output a driving signal; the oscillation circuit is used to receive a DC voltage signal, convert the DC voltage signal into an AC voltage signal based on the driving signal, and output the AC voltage signal to the voltage signal processing circuit; the voltage signal processing circuit is at least used to boost the AC voltage signal to obtain a first square wave pulse signal, and output the first square wave pulse signal to the plasma generator.

[0006] In some embodiments, the device also includes: a first sampling circuit, a sampling end of the first sampling circuit is connected to the oscillation circuit; the signal generating circuit includes a control signal generating circuit and a drive signal generating circuit; the output end of the control signal generating circuit is connected to the first input end of the drive signal generating circuit, and the output end of the first sampling circuit is connected to the second input end of the drive signal generating circuit; the output end of the drive signal generating circuit is connected to the input end of the oscillation circuit.

[0007] It can be seen that the drive signal generating circuit can control the voltage value of the drive signal output by itself according to the signal output by the control signal generating circuit and the signal output by the first sampling circuit. Therefore, the embodiment of the present application can adjust the voltage value of the output signal of the oscillation circuit, thereby adjusting the voltage value of the signal received by the plasma generator. Furthermore, compared with the scheme of sampling the output signal of the boost rectifier circuit, the first sampling circuit can convert the AC voltage signal before the transformer amplifies into a DC square wave pulse signal. Therefore, the use of high-voltage components and isolation components can be reduced, which is conducive to reducing costs.

[0008] In some embodiments, the device also includes: a second sampling circuit, a sampling end of the second sampling circuit is connected to the voltage signal processing circuit; the signal generating circuit includes a control signal generating circuit and a drive signal generating circuit; the output end of the control signal generating circuit is connected to the first input end of the drive signal generating circuit, and the output end of the second sampling circuit is connected to the second input end of the drive signal generating circuit; the output end of the drive signal generating circuit is connected to the input end of the oscillation circuit.

[0009] It can be seen that the driving signal generating circuit can control the voltage value of the driving signal output by itself according to the signal output by the control signal generating circuit and the signal output by the second sampling circuit. Therefore, the embodiment of the present application can realize the adjustment of the voltage value of the output signal of the oscillation circuit, thereby realizing the adjustment of the voltage value of the signal received by the plasma generator.

[0010] In some embodiments, the amplitude of the high-level signal of the pulse signal output by the control signal generating circuit is between 0 and 20 V, and the amplitude of the low-level signal of the pulse signal output by the control signal generating circuit is between 0 and 20 V.

[0011] In some embodiments, the frequency of the pulse signal output by the control signal generating circuit is less than 20 Hz.

[0012] In some embodiments, the duty cycle of the pulse signal output by the control signal generating circuit is between 5% and 95%.

[0013] In some embodiments, the voltage signal processing circuit includes a boost circuit for boosting the AC voltage signal and a rectifier circuit; the rectifier circuit is used to rectify the boosted AC voltage signal to obtain a first square wave pulse signal, and output the first square wave pulse signal to the plasma generator.

[0014] In some embodiments, the amplitude of the high level signal of the first square wave pulse signal is between 10 kV and 20 kV; the amplitude of the low level signal of the first square wave pulse signal is greater than 0 v and less than 7 kV.

[0015] In some embodiments, the frequency of the first square wave pulse signal is less than 20 Hz.

[0016] In some embodiments, a duty cycle of the first square wave pulse signal is between 5% and 95%.

[0017] In some embodiments, the low level signal and the high level signal in the first square wave pulse signal are both positive voltage signals; or, the low level signal and the high level signal in the first square wave pulse signal are both negative voltage signals. It can be seen that the first square wave pulse signal is a voltage signal that does not cross zero, therefore, the low level signal and the high level signal in the first square wave pulse signal can both drive the plasma generator to work, which is conducive to maintaining the effect of the plasma generator in purifying the air.

[0018] An air conditioner provided in an embodiment of the present application comprises any one of the above-mentioned plasma generating devices.

[0019] The present application provides an electronic equipment air conditioner, comprising any one of the above-mentioned plasma generating devices.

[0020] A circuit control method provided in an embodiment of the present application is applied to the plasma generating device described above, and the method includes: generating a driving signal; converting a DC voltage signal into an AC voltage signal based on the driving signal; boosting the AC voltage signal, rectifying the boosted AC voltage signal to obtain a first square wave pulse signal; and outputting the first square wave pulse signal to a plasma generator.

[0021] In some embodiments, after generating the drive signal, the method also includes: stepping down the AC voltage signal into a second square wave pulse signal; generating a basic square wave pulse signal; comparing the voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal to obtain a first comparison result, and adjusting the voltage value of the drive signal according to the first comparison result so that the voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal are equal.

[0022] In some embodiments, the amplitude of the target type signal in the first square wave pulse signal is positively correlated with the voltage value of the target type signal in the second square wave pulse signal, and the target type signal is a high level signal or a low level signal;

[0023] The step of adjusting the voltage value of the driving signal according to the first comparison result so that the voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal are equal includes: when the first voltage value is greater than the second voltage value, increasing the voltage value of the driving signal, and when the first voltage value is less than the second voltage value, decreasing the voltage value of the driving signal so that the first voltage value is equal to the second voltage value; the first voltage value represents the voltage value of the target type signal of the basic square wave pulse signal, and the second voltage value represents the voltage value of the target type signal of the second square wave pulse signal.

[0024] In some embodiments, after generating the driving signal, the method also includes: reducing the voltage of the first square wave pulse signal and converting it into a third wave pulse signal; generating a basic square wave pulse signal; comparing the voltage values ​​of the basic square wave pulse signal and the third wave pulse signal to obtain a second comparison result, and adjusting the voltage value of the driving signal according to the second comparison result so that the voltage values ​​of the basic square wave pulse signal and the third wave pulse signal are equal.

[0025] In some embodiments, the low level signal and the high level signal in the first square wave pulse signal are both positive voltage signals, the voltage value of the target type signal in the first square wave pulse signal is positively correlated with the voltage value of the target type signal in the third square wave pulse signal, and the target type signal is a high level signal or a low level signal;

[0026] The step of adjusting the voltage value of the driving signal according to the second comparison result so that the voltage values ​​of the basic square wave pulse signal and the third square wave pulse signal are equal includes: when the first voltage value is greater than the third voltage value, increasing the voltage value of the driving signal; when the first voltage value is less than the third voltage value, decreasing the voltage value of the driving signal so that the first voltage value is equal to the third voltage value; the first voltage value represents the voltage value of the target type signal of the basic square wave pulse signal, and the third voltage value represents the voltage value of the target type signal of the third square wave pulse signal.

[0027] In some embodiments, the low level signal and the high level signal in the first square wave pulse signal are both negative voltage signals, the absolute value of the voltage value of the target type signal in the first square wave pulse signal is negatively correlated with the voltage value of the target type signal of the third square wave pulse signal, and the target type signal is a high level signal or a low level signal;

[0028] The step of adjusting the voltage value of the driving signal according to the second comparison result so that the voltage values ​​of the basic square wave pulse signal and the third square wave pulse signal are equal includes: when the first voltage value is less than the third voltage value, increasing the voltage value of the driving signal, and when the first voltage value is greater than the third voltage value, decreasing the voltage value of the driving signal so that the first voltage value is equal to the third voltage value; the first voltage value represents the voltage value of the target type signal of the basic square wave pulse signal, and the third voltage value represents the voltage value of the target type signal of the third square wave pulse signal.

[0029] In some embodiments, generating the driving signal includes: determining the frequency of the basic square wave pulse signal as the frequency of the driving signal; and generating the driving signal according to the frequency of the driving signal.

[0030] In some embodiments, generating the driving signal includes: determining the duty cycle of the basic square wave pulse signal as the duty cycle of the driving signal; and generating the driving signal according to the duty cycle of the driving signal.

[0031] It can be seen that the embodiment of the present application can utilize a signal generating circuit, an oscillation circuit, and a voltage signal processing circuit to generate a first square wave pulse signal for driving the plasma generator to operate. Therefore, the plasma generator can achieve efficient air purification based on the high-level signal of the first square wave pulse signal, and can also achieve air purification based on the low-level signal of the first square wave pulse signal. Compared with the scheme of using a constant voltage to drive the plasma generator to operate in the related art, the embodiment of the present application uses the low-level signal of the first square wave pulse signal as the driving signal of the plasma generator, which is beneficial to reducing the driving voltage of the plasma generator, thereby helping to reduce the ozone concentration in the environment surrounding the plasma generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the relationship between the ozone concentration in the indoor space and the working time of the plasma generator and the driving voltage of the plasma generator in the related art;

[0033] Figure 2 A schematic structural diagram of a plasma generating device according to an embodiment of the present application;

[0034] Figure 3 A schematic structural diagram of another plasma generating device according to an embodiment of the present application;

[0035] Figure 4 This is a schematic structural diagram of another plasma generating device according to an embodiment of the present application;

[0036] Figure 5Schematic diagram of a basic square wave pulse signal in an embodiment of the present application;

[0037] Figure 6 This is a schematic diagram of the structure of the oscillation circuit in the embodiment of the present application;

[0038] Figure 7 This is a schematic diagram of the structure of a voltage doubler rectifier circuit in an embodiment of the present application;

[0039] Figure 8 Schematic diagram of the circuit structure of the plasma generator in the embodiment of the present application;

[0040] Fig. 9 This is a schematic diagram of the relationship between the ozone concentration in the surrounding environment of the plasma generator and the duration of the high-level signal when the plasma generator is driven to work by a high-level signal of 8kV in an embodiment of the present application;

[0041] Fig.10 Schematic diagram of the relationship between the ozone concentration in the surrounding environment of the plasma generator and the voltage value of the high-level signal when the duration of the high-level signal is 2.5s in the embodiment of the present application;

[0042] Fig.11 This is a schematic diagram of the structure of the second sampling circuit in an embodiment of the present application;

[0043] Fig.12 This is a schematic diagram of the structure of the driving signal generating circuit in an embodiment of the present application;

[0044] Fig.13 A flow chart for controlling the voltage value, frequency and duty cycle of the first square wave pulse signal received by the plasma generator in an embodiment of the present application;

[0045] Fig.14 A schematic diagram of a first square wave pulse signal in an embodiment of the present application;

[0046] Fig.15 Another schematic diagram of the first square wave pulse signal in the embodiment of the present application;

[0047] Fig.16 Another flow chart for controlling the voltage value, frequency and duty cycle of the first square wave pulse signal received by the plasma generator in the embodiment of the present application;

[0048] Fig.17 Flow chart of a circuit control method according to an embodiment of the present application. DETAILED DESCRIPTION

[0049] In the relevant technology, for air-conditioning users, the demand for air management and purification when using air-conditioning is getting higher and higher. Among them, low-temperature plasma purification technology can effectively kill bacteria, viruses, etc. in the air. In actual scenarios, a plasma generator can be used to purify the air. Here, a plasma generator is a device that generates plasma. Plasma is the fourth state of matter, that is, ionized "gas", which presents a highly excited unstable state, including ions (with different signs and charges), electrons, atoms and molecules.

[0050] In the related art, the driving voltage of the plasma generator is a constant voltage; the higher the voltage of the plasma generator, the better the air purification effect, but the ozone concentration will also be higher; ozone is an allotrope of oxygen, which is a light blue gas at normal temperature and pressure, liquid ozone is dark blue, and solid ozone is purple-black. The smell of ozone is similar to fish, but when the ozone concentration is too high, the smell is similar to chlorine.

[0051] like Figure 1 As shown, when the driving voltage of the plasma generator remains unchanged, as the working time of the plasma generator increases, the ozone concentration and sterilization rate of the indoor space will increase; for example, when the driving voltage of the ion generator is 6kV, if the working time of the plasma generator increases from 30 minutes (min) to 1 hour (h), the ozone concentration and sterilization rate will gradually increase. When the working time of the plasma generator remains unchanged, as the driving voltage of the plasma generator increases, the ozone concentration and sterilization rate of the indoor space will increase; for example, when the working time of the plasma generator is 1 hour, if the working voltage of the plasma generator is increased from 6kV to 7kV, the ozone concentration at 5cm from the air outlet of the air conditioner will increase to 20ppb, and the ozone concentration in other indoor spaces will increase to 75ppb.

[0052] In summary, in an indoor environment, when the plasma generator continues to work, as time goes by, the ozone production rate will be greater than the dissipation rate, and the ozone concentration will become higher and higher. When the ozone concentration reaches 20ppb, users can smell the ozone; when the ozone concentration reaches 50ppb, it means that the plasma generator does not meet the standards and cannot be put on the market.

[0053] In order to solve the above technical problems, a technical solution of the embodiment of the present application is proposed.

[0054] The following is a further detailed description of the embodiments of the present application in conjunction with the accompanying drawings and examples. It should be understood that the embodiments provided herein are only used to explain the embodiments of the present application and are not intended to limit the embodiments of the present application. In addition, the embodiments provided below are partial embodiments for implementing the present application, rather than providing all embodiments for implementing the present application. In the absence of conflict, the technical solutions recorded in the embodiments of the present application can be implemented in any combination.

[0055] It should be noted that, in the embodiments of the present application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a method or device including a series of elements includes not only the elements explicitly recorded, but also includes other elements not explicitly listed, or also includes elements inherent to the implementation of the method or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other related elements (such as steps in a method or units in a device, for example, a unit may be a part of a circuit, a part of a processor, a part of a program or software, etc.) in the method or device including the element.

[0056] For example, the circuit control method provided in the embodiment of the present application includes a series of steps, but the circuit control method provided in the embodiment of the present application is not limited to the recorded steps. Similarly, the plasma generating device provided in the embodiment of the present application includes a series of modules, but the device provided in the embodiment of the present application is not limited to including the modules explicitly recorded, and may also include modules required to obtain relevant information or perform processing based on information.

[0057] Figure 2 Schematic diagram of the structure of a plasma generating device according to an embodiment of the present application. Figure 2 As shown, the device may include a signal generating circuit 10, an oscillating circuit 20, a voltage signal processing circuit 30 and a plasma generator 40 connected in sequence; wherein,

[0058] The signal generating circuit 10 is powered by a direct current power supply DC, and is used to generate a driving signal and output the driving signal to the oscillation circuit 20. For example, the driving signal may be a square wave pulse signal.

[0059] The oscillation circuit 20 is used to receive a DC voltage signal, convert the DC voltage signal into an AC voltage signal based on the driving signal, and output the AC voltage signal to the voltage signal processing circuit 30. For example, the DC voltage signal received by the oscillation circuit 20 may be a voltage signal of a DC power supply.

[0060] The voltage signal processing circuit 30 is at least used for performing voltage boost processing on the AC voltage signal to obtain a first square wave pulse signal, and outputting the first square wave pulse signal to the plasma generator 40 .

[0061] In some embodiments, reference Figure 3 and Figure 4 The signal generating circuit 10 includes a control signal generating circuit 101 and a driving signal generating circuit 102 .

[0062] Exemplarily, the control signal generating circuit 101 can output the control signal through the air conditioner indoor unit electronic control, or crystal oscillator chip, or digital chip, or operational amplifier RC resonance mode, where the control signal is a basic square wave pulse signal with a small voltage.

[0063] In the embodiment of the present application, the amplitude of the high level signal of the pulse signal output by the control signal generating circuit 101 is between 0 and 20v, and the amplitude of the low level signal of the pulse signal output by the control signal generating circuit 101 is between 0 and 20v; in some embodiments, the amplitude of the high level signal of the pulse signal output by the control signal generating circuit 101 is between 0 and 10v, and the amplitude of the low level signal of the pulse signal output by the control signal generating circuit 101 is between 0 and 10v. The frequency of the pulse signal output by the control signal generating circuit 101 is less than 20Hz, and in some embodiments, the frequency of the pulse signal output by the control signal generating circuit 101 is less than 10Hz. The duty cycle of the pulse signal output by the control signal generating circuit 101 is between 5% and 95%, and in some embodiments, the duty cycle of the pulse signal output by the control signal generating circuit 101 is between 10% and 90%.

[0064] In actual scenarios, the voltage amplitude of the basic square wave pulse signal can be adjusted according to actual needs. Figure 5 , the voltage of the high-level signal of the basic square wave pulse signal is V1, and the duration of the high-level signal of the basic square wave pulse signal in one signal cycle is t1; the voltage of the high-level signal of the basic square wave pulse signal is V2, and the duration of the low-level signal of the basic square wave pulse signal in one signal cycle is t2; the value range of V1 and V2 can be 0 to 10V, V1>V2, it can be seen that the frequency f of the basic square wave pulse signal is 1 / (t1+t2), and the duty cycle d of the basic square wave pulse signal is t1 / (t1+t2).

[0065] Exemplarily, the driving signal generating circuit 102 is used to adjust at least one of the voltage value, frequency and duty cycle of the basic square wave pulse signal, and output the adjusted driving signal to the oscillation circuit 20 .

[0066] Exemplarily, the oscillation circuit 20 can oscillate the DC voltage signal into an AC voltage signal according to the driving signal and in the form of a transistor switch, and the oscillation frequency of the oscillation circuit 20 can be between 20 kHz and 100 kHz. The oscillation amplitude of the oscillation circuit 20 is determined by the voltage value of the driving signal.

[0067] Reference Figure 6The oscillation circuit 20 receives a DC voltage signal through a first input terminal and a second input terminal, and a control terminal AMP-V of the oscillation circuit 20 is used to receive a driving signal; the oscillation circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first inductor L1, a first transistor Q1 and a second transistor Q2. For example, the model of the first capacitor C1 is C-0805-104K100-X7R, the inductance value of the first inductor L1 is 40μH, and the current of the first inductor L1 is 1A; the models of the first transistor Q1 and the second transistor Q2 are both TIP31B-B; the second resistor R2 and the third resistor R3 are both chip resistors.

[0068] In one example, the voltage signal processing circuit 30 may include a boost circuit for boosting the AC voltage signal, and a rectifier circuit; the rectifier circuit is used to rectify the boosted AC voltage signal to obtain a first square wave pulse signal, and output the first square wave pulse signal to the plasma generator.

[0069] In another example, the voltage signal processing circuit 30 may include a transformer and a voltage doubling rectifier circuit. The transformer can boost the voltage signal, the voltage amplification factor of the transformer is the turns ratio n of the transformer, and the calculation formula of the voltage value b of the voltage signal output by the secondary coil of the transformer is:

[0070] b=a*n (1)

[0071] Where a represents the voltage value of the primary coil of the transformer.

[0072] After the driving signal is amplified by the transistor of the oscillation circuit 20 , it can be output to the transformer of the voltage signal processing circuit 30 ; the first output terminal, the second output terminal, the third output terminal and the fourth output terminal of the oscillation circuit 20 are connected to the transformer of the voltage signal processing circuit 30 .

[0073] Reference Figure 7 The voltage doubler rectifier circuit may include 2m capacitors, 2m diodes and a sixth resistor R L , where the 2m capacitors are denoted as C1 to C 2m , 2m diodes are denoted as D1 to D 2m m is an integer greater than or equal to 1. The AC end of the voltage doubler rectifier circuit receives the voltage signal output by the transformer. The output signal of the voltage doubler rectifier circuit is a first square wave pulse signal. The voltage value of the first square wave pulse signal is V outIn the embodiment of the present application, the voltage doubler rectifier circuit utilizes the unidirectional conduction of the diode and the charging, discharging and storing principle of the capacitor to rectify the AC voltage signal into a DC voltage signal through the m-level voltage doubler rectifier circuit. In the voltage doubler rectifier circuit, the combination of a capacitor and a diode can achieve a first-level voltage doubler, and the combination of m capacitors and m diodes can achieve an m-level voltage doubler. Then the voltage value V of the first square wave pulse signal is out The calculation formula is:

[0074] V out =2*m*bI out / f0 / C*(2*(m 3 ) / 3+(m 2 ) / 2-m / 6) (2)

[0075] Among them, f0 is the oscillation frequency of the oscillation circuit, C is the capacitance value of the voltage doubler rectifier circuit, I out is the output current of the boost rectifier circuit.

[0076] In the embodiment of the present application, the amplitude of the high level signal of the first square wave pulse signal is between 10kV and 20kV; in some embodiments, the amplitude of the high level signal of the first square wave pulse signal is 15kV. The amplitude of the low level signal of the first square wave pulse signal is greater than 0V and less than 7kV, and in some embodiments, the amplitude of the low level signal of the first square wave pulse signal is greater than 0V and less than 5kV.

[0077] In an embodiment of the present application, the frequency of the first square wave pulse signal is less than 20 Hz, and in some embodiments, the frequency of the first square wave pulse signal is less than 10 Hz. The duty cycle of the first square wave pulse signal is between 5% and 95%, and in some embodiments, the duty cycle of the first square wave pulse signal is between 10% and 90%.

[0078] Reference Figure 8The HV end of the plasma generator 40 is connected to the output end of the voltage doubling rectifier circuit, the LV end of the plasma generator 40 can be grounded, and the plasma generator 40 may include an anode, a cathode, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and a fourteenth resistor R14, wherein the anode of the plasma generator 40 is respectively connected to the eleventh resistor R11, the twelfth resistor R12 and the high voltage direct current (HVDC) interface, and the cathode of the plasma generator 40 is connected to the thirteenth resistor R13. Exemplarily, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the thirteenth resistor R13 and the fourteenth resistor R14 are all models 2010-246-F-1 / 2W-T, and the eleventh resistor R11 and the twelfth resistor R12 are all models 2010-105-F-1 / 2W-T.

[0079] In the embodiment of the present application, after the first square wave pulse signal is output to the plasma generator 40, the plasma generator 40 can be driven to work by the first square wave pulse signal. When the voltage value of the low level signal of the first square wave pulse signal is low, if the plasma generator 40 is driven to work based on the low level signal of the first square wave pulse signal, the ozone concentration in the surrounding environment of the plasma generator 40 can be reduced.

[0080] Fig. 9 Schematic diagram of the relationship between the ozone concentration in the surrounding environment of the plasma generator 40 and the duration of the high-level signal when the plasma generator 40 is driven to work by a high-level signal of 8 kV in the embodiment of the present application, Fig. 9 In the graph, the horizontal axis is time in seconds, and the vertical axis is ozone concentration in ppb. Fig.10 Schematic diagram of the relationship between the ozone concentration in the surrounding environment of the plasma generator 40 and the voltage value of the high-level signal when the duration of the high-level signal is 2.5s in the embodiment of the present application, Fig.10 In the graph, the horizontal axis is the voltage value in kV, and the vertical axis is the ozone concentration in ppb. Fig. 9 and Fig.10 The surrounding environment of the plasma generator 40 is 30m 3 The ozone concentration in the space is the average ozone concentration per hour. Fig. 9 and Fig.10 It can be seen that when the duration of the high-level signal is low, the ozone concentration in the environment around the ion generator 40 is low. When the voltage value of the high-level signal is less than or equal to 5 kV, the ozone concentration in the environment around the plasma generator 40 is very low. Therefore, the ozone concentration in the environment around the plasma generator 40 can be controlled by controlling the voltage value and duration of the high-level signal.

[0081] It can be seen that the embodiment of the present application can utilize a signal generating circuit, an oscillation circuit, and a voltage signal processing circuit to generate a first square wave pulse signal for driving the plasma generator to operate. Therefore, the plasma generator can achieve efficient air purification based on the high-level signal of the first square wave pulse signal, and can also achieve air purification based on the low-level signal of the first square wave pulse signal. Compared with the scheme of using a constant voltage to drive the plasma generator to operate in the related art, the embodiment of the present application uses the low-level signal of the first square wave pulse signal as the driving signal of the plasma generator, which is beneficial to reducing the driving voltage of the plasma generator, thereby helping to reduce the ozone concentration in the environment surrounding the plasma generator.

[0082] In some embodiments of the present application, reference Figure 3 The plasma generating device further includes a first sampling circuit 50 , and a sampling end of the first sampling circuit 50 is connected to the oscillation circuit 20 .

[0083] The signal generating circuit 10 may include a control signal generating circuit 101 and a drive signal generating circuit 102; the output end of the control signal generating circuit 101 is connected to the first input end of the drive signal generating circuit 102, the output end of the first sampling circuit 50 is connected to the second input end of the drive signal generating circuit 102; the output end of the drive signal generating circuit 102 is connected to the input end of the oscillation circuit 20.

[0084] It can be seen that the drive signal generating circuit can control the voltage value of the drive signal output by itself according to the signal output by the control signal generating circuit and the signal output by the first sampling circuit. Therefore, the embodiment of the present application can adjust the voltage value of the output signal of the oscillation circuit, thereby adjusting the voltage value of the signal received by the plasma generator. Furthermore, compared with the scheme of sampling the output signal of the voltage signal processing circuit, the first sampling circuit can convert the AC voltage signal into a DC square wave pulse signal before the transformer is amplified. Therefore, the use of high-voltage components and isolation components can be reduced, which is conducive to reducing costs.

[0085] In some embodiments, the first sampling circuit 50 is used to step down the output signal of the oscillation circuit 20 into a second square wave pulse signal, and output the second square wave pulse signal to the drive signal generating circuit 102; the low level signal and the high level signal in the second square wave pulse signal are both positive voltage signals.

[0086] The control signal generating circuit 101 is used to generate a basic square wave pulse signal, and output the basic square wave pulse signal to the driving signal generating circuit 102; the low level signal and the high level signal in the basic square wave pulse signal are both positive voltage signals.

[0087] The drive signal generating circuit 102 is used to compare the voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal to obtain a first comparison result, and adjust the voltage value of the drive signal output by the drive signal generating circuit 102 according to the first comparison result so that the voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal are equal.

[0088] Here, the first sampling circuit 50 can convert the AC voltage signal before transformer amplification into a DC square wave pulse signal, so that the driving signal generation circuit compares the square wave pulse signal fed back by the first sampling circuit 50 with the basic square wave pulse signal. For example, the voltage value of the DC square wave pulse signal is between 0 and 5V.

[0089] It can be seen that the drive signal generating circuit can control the voltage value of the drive signal output by itself according to the voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal, so that the voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal are equal. In this way, the embodiment of the present application can control the voltage value of the second square wave pulse signal through the drive signal generating circuit; since the second square wave pulse signal is a voltage signal obtained after the output signal of the oscillation circuit is stepped down, the embodiment of the present application can adjust the voltage value of the output signal of the oscillation circuit, thereby adjusting the voltage value of the signal received by the plasma generator. Furthermore, compared with the scheme of sampling the output signal of the voltage signal processing circuit, the first sampling circuit can convert the AC voltage signal before the transformer amplification into a DC square wave pulse signal, thereby reducing the use of high-voltage components and isolation components, which is conducive to reducing costs.

[0090] In some embodiments of the present application, reference Figure 4 The plasma generating device further includes a second sampling circuit 60 , which is connected to the voltage signal processing circuit 30 .

[0091] The sampling end of the second sampling circuit 60 is connected to the voltage signal processing circuit 30; the output end of the control signal generating circuit 101 is connected to the first input end of the drive signal generating circuit 102, and the output end of the second sampling circuit 60 is connected to the second input end of the drive signal generating circuit 102; the output end of the drive signal generating circuit 102 is connected to the input end of the oscillation circuit 20.

[0092] It can be seen that the driving signal generating circuit can control the voltage value of the driving signal output by itself according to the signal output by the control signal generating circuit and the signal output by the second sampling circuit. Therefore, the embodiment of the present application can realize the adjustment of the voltage value of the output signal of the oscillation circuit, thereby realizing the adjustment of the voltage value of the signal received by the plasma generator.

[0093] In some embodiments, the second sampling circuit 60 is used to step down the output signal of the voltage signal processing circuit 30 into a third square wave pulse signal, and output the third square wave pulse signal to the drive signal generating circuit; the low level signal and the high level signal in the fourth square wave pulse signal are both positive voltage signals.

[0094] The control signal generating circuit 102 is used to generate a basic square wave pulse signal and output the basic square wave pulse signal to the driving signal generating circuit 102; the low level signal and the high level signal in the basic square wave pulse signal are both positive voltage signals.

[0095] The driving signal generating circuit 102 is used to compare the voltage values ​​of the basic square wave pulse signal and the third-party wave pulse signal to obtain a second comparison result, and adjust the voltage value of the driving signal according to the second comparison result to make the voltage values ​​of the basic square wave pulse signal and the third-party wave pulse signal equal.

[0096] Here, the second sampling circuit 60 can convert the high-voltage square wave pulse signal output by the voltage signal processing circuit into a low-voltage third-wave pulse signal, so that the driving signal generating circuit compares the square wave pulse signal fed back by the second sampling circuit 60 with the basic square wave pulse signal. For example, the second sampling circuit 60 can convert the high-voltage square wave pulse signal output by the voltage signal processing circuit into a low-voltage third-wave pulse signal according to a voltage reduction factor of 2000 times.

[0097] For example, refer to Fig.11 , the second sampling circuit 60 includes a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7 and a first operational amplifier IC3A. The first sampling end of the second sampling circuit 60 is connected to the HV end of the plasma generator 40, the second sampling end of the second sampling circuit 60 is connected to the LV end of the plasma generator 40, and the output end of the second sampling circuit 60 is connected to the drive signal generating circuit 102. The voltage value range of the third wave pulse signal output by the output end of the second sampling circuit 60 is 3V to 1.27V. The fourth capacitor C4 is connected between the 12V DC power supply and the ground.

[0098] For example, the model of the fifteenth resistor R15 is 0805-2702-F-1 / 8W-T, the model of the sixteenth resistor R16 is 0805-2002-F-1 / 8W-LS-T, the model of the seventeenth resistor R17 and the eighteenth resistor R18 are both 0603-102-F-1 / 10W-T, the model of the nineteenth resistor R19 is 0603-103-F-1 / 10W-T, and the model of the twentieth resistor R20 is 0603-682-F-1 / 10W-LS-T. The model of the fourth capacitor C4 is C-0603-104K50-X7k-01, and the models of the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7 are all C-0603-103K50-X7R. The model of the first operational amplifier IC3A is LM258.

[0099] It can be seen that the driving signal generating circuit can control the voltage value of the driving signal outputted by itself according to the voltage values ​​of the basic square wave pulse signal and the third wave pulse signal, so that the voltage values ​​of the basic square wave pulse signal and the third wave pulse signal are equal. In this way, the embodiment of the present application can control the voltage value of the third wave pulse signal through the driving signal generating circuit; since the third wave pulse signal is a voltage signal obtained after the output signal of the voltage signal processing circuit is buck-converted, the embodiment of the present application can adjust the voltage value of the output signal of the oscillation circuit, thereby adjusting the voltage value of the signal received by the plasma generator. Further, compared with the scheme of sampling the output signal of the oscillation circuit, the second sampling circuit can directly sample the voltage signal received by the plasma generator, that is, the voltage signal obtained by sampling can more accurately reflect the voltage value of the voltage signal received by the plasma generator, and the driving signal generating circuit can more accurately adjust the voltage value of the voltage signal received by the plasma generator based on the voltage signal sampled by the second sampling circuit.

[0100] For example, refer to Fig.12The drive signal generating circuit 102 includes a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a second operational amplifier IC1A and a rectifier diode D1. The first input terminal AMP-Vref of the drive signal generating circuit 102 is connected to the output terminal of the control signal generating circuit 101. For example, the voltage value range of the basic square wave pulse signal received by the first input terminal AMP-Vref of the drive signal generating circuit 102 is 3V to 1.27V; the second input terminal V-FB of the drive signal generating circuit 102 is connected to the output terminal of the first sampling circuit 50 or the output terminal of the second sampling circuit 60; the output terminal of the drive signal generating circuit 102 is connected to the control terminal AMP-V of the oscillation circuit 20; the eighth capacitor C8 is connected between the 12V DC power supply and the ground.

[0101] Exemplarily, the twenty-first resistor R21 and the twenty-second resistor R22 are both chip resistors, and the models of the twenty-first resistor R21 and the twenty-second resistor R22 are both RoHS 0603-103-F-1 / 10W-LS-T; the model of the twenty-third resistor R23 is 104-F-1 / 10W-LS-T, and the model of the twenty-fourth resistor R24 ​​is 0603-104-F-1 / 10W-LS-T. The model of the eighth capacitor C8 is C-0603-104K50-X7R-01, the model of the ninth capacitor C9 is C-0805-104K100-X7R, the model of the tenth capacitor C10 is C-0603-102J50COG-01, and the model of the eleventh capacitor C11 is C-0603-105K16-X5R. The model of the second operational amplifier IC1A is LM258, the model of the rectifier diode D1 is DN-RB715WTL-SOT416-T, the maximum forward voltage drop of the rectifier diode D1 is 0.37V, and the average rectifier current of the rectifier diode D1 is 30mA.

[0102] In summary, the drive signal generating circuit 102 adopts a negative feedback control mode to compare the output signal of the first sampling circuit with the basic square wave pulse signal, or adopts a negative feedback control mode to compare the output signal of the second sampling circuit with the basic square wave pulse signal, and controls the voltage value of the drive signal so that the voltage value of the second square wave pulse signal or the voltage value of the third square wave pulse signal is equal to the voltage value of the basic square wave pulse signal.

[0103] In some embodiments of the present application, the driving signal generating circuit 102 is also used to determine the frequency of the basic square wave pulse signal as the frequency of the driving signal. It can be seen that since the oscillation circuit converts the DC voltage signal into an AC voltage signal according to the driving signal, and the voltage signal processing circuit can convert the input AC voltage signal into the first square wave pulse signal received by the plasma generator, therefore, by determining the frequency of the basic square wave pulse signal as the frequency of the driving signal, the frequency of the first square wave pulse signal can be made equal to the frequency of the basic square wave pulse signal; further, since the frequency of the basic square wave pulse signal can be determined by the control signal generating circuit according to actual needs, therefore, the embodiment of the present application can flexibly control the frequency of the first square wave pulse signal received by the plasma generator according to actual needs.

[0104] In some embodiments of the present application, the driving signal generating circuit 102 is also used to determine the duty cycle of the basic square wave pulse signal as the duty cycle of the driving signal. It can be seen that since the oscillation circuit converts the DC voltage signal into the AC voltage signal according to the driving signal, and the voltage signal processing circuit can convert the input AC voltage signal into the first square wave pulse signal received by the plasma generator, therefore, by determining the duty cycle of the basic square wave pulse signal as the duty cycle of the driving signal, the duty cycle of the first square wave pulse signal can be made equal to the duty cycle of the basic square wave pulse signal; further, since the duty cycle of the basic square wave pulse signal can be determined by the control signal generating circuit according to actual needs, therefore, the embodiment of the present application can flexibly control the duty cycle of the first square wave pulse signal received by the plasma generator according to actual needs.

[0105] In some embodiments of the present application, a high-level signal or a low-level signal is recorded as a target type signal; the absolute value of the voltage value of the target type signal in the first square wave pulse signal is positively correlated with the voltage value of the target type signal of the second square wave pulse signal; that is, when the first square wave pulse signal output by the voltage signal processing circuit 30 is a positive voltage signal, the higher the voltage value of the target type signal in the first square wave pulse signal, the higher the voltage value of the target type signal of the second square wave pulse signal; when the first square wave pulse signal output by the voltage signal processing circuit 30 is a negative voltage signal, the higher the absolute value of the voltage value of the target type signal in the first square wave pulse signal, the higher the voltage value of the target type signal of the second square wave pulse signal.

[0106] In the embodiment of the present application, the voltage value of the target type signal of the basic square wave pulse signal is recorded as the first voltage value, and the voltage value of the target type signal of the second square wave pulse signal is recorded as the second voltage value. The drive signal generating circuit 102 is used to increase the voltage value of the drive signal when the first voltage value is greater than the second voltage value, and to reduce the voltage value of the drive signal when the first voltage value is less than the second voltage value, so that the first voltage value is equal to the second voltage value.

[0107] In some embodiments, since V1 represents the voltage value of the high-level signal of the basic square wave pulse signal, and V2 represents the voltage value of the low-level signal of the basic square wave pulse signal, V1 and V2 are both first voltage values. The voltage value of the high-level signal of the square wave pulse signal received by the second input terminal of the drive signal generating circuit is recorded as V3, and the voltage value of the low-level signal of the square wave pulse signal received by the second input terminal of the drive signal generating circuit is recorded as V4. When the square wave pulse signal received by the second input terminal of the drive signal generating circuit is a second square wave pulse signal, V3 and V4 are both second voltage values. The voltage value of the high-level signal of the first square wave pulse signal received by the plasma generator is recorded as U1, and the voltage value of the low-level signal of the first square wave pulse signal received by the plasma generator is recorded as U2.

[0108] Reference Fig.13 The process of controlling the voltage value, frequency and duty cycle of the first square wave pulse signal received by the plasma generator may include:

[0109] Step 1300: Turn on the DC power supply, and then, step 1301 and step 1307 may be performed.

[0110] Here, the DC power supply is the power supply for the plasma generating device; after the DC power supply is turned on, the control signal generating circuit, the drive signal generating circuit, the oscillation circuit, the voltage signal processing circuit, the plasma generator and the first sampling circuit can operate normally.

[0111] Step 1301: Determine the voltage value V1 of the high-level signal of the basic square wave pulse signal.

[0112] Step 1302: Determine whether V1 is greater than V3, if yes, execute step 1303, if no, execute step 1304.

[0113] Step 1303 : Increase the voltage value of the driving signal, and then execute step 1305 .

[0114] Step 1304 : reduce the voltage value of the driving signal, and then execute step 1305 .

[0115] Step 1305: Determine whether V1 is equal to V3, if yes, execute step 1306, if no, return to step 1302.

[0116] Step 1306 : Determine the voltage value U1 of the high-level signal of the first square wave pulse signal, and then execute step 1313 .

[0117] Here, U1=V1*X, X represents the voltage amplification factor of the signal amplification part, and the signal amplification part includes an oscillation circuit and a voltage signal processing circuit.

[0118] Step 1307: Determine the voltage value V2 of the low-level signal of the basic square wave pulse signal.

[0119] Step 1308: Determine whether V2 is greater than V4, if yes, execute step 1309, if no, execute step 1310.

[0120] Step 1309 : Increase the voltage value of the driving signal, and then execute step 1311 .

[0121] Step 1310 : reduce the voltage value of the driving signal, and then execute step 1311 .

[0122] Step 1311: Determine whether V2 is equal to V4, if yes, execute step 1312, if no, return to step 1308.

[0123] Step 1312: Determine the voltage value U2 of the low-level signal of the first square wave pulse signal.

[0124] Here, U1=V2*X.

[0125] In the embodiment of the present application, steps 1302 to 1312 can be implemented based on a driving signal generating circuit.

[0126] Step 1313: Determine the frequency and duty cycle of the first square wave pulse signal, and then the process can be ended.

[0127] In an embodiment of the present application, the drive signal generating circuit can control the frequency and duty cycle of the drive signal according to the frequency and duty cycle of the basic square wave pulse signal, thereby controlling the frequency and duty cycle of the first square wave pulse signal; here, the frequency of the first square wave pulse signal and the frequency of the basic square wave pulse signal are both f, and the duty cycle of the first square wave pulse signal and the duty cycle of the basic square wave pulse signal are both d. It can be seen that the duration of the high-level signal in the first square wave pulse signal within a signal cycle is t1, and the duration of the low-level signal in the first square wave pulse signal within a signal cycle is t2.

[0128] It can be seen that the drive signal generating circuit can control the voltage value of the drive signal output by itself by comparing the voltage value of the target type signal of the basic square wave pulse signal with the voltage value of the target type signal of the second square wave pulse signal. When the voltage value of the target type signal of the basic square wave pulse signal and the voltage value of the target type signal of the second square wave pulse signal are not equal, the voltage value of the basic square wave pulse signal and the voltage value of the second square wave pulse signal are made equal by adjusting the voltage value of the drive signal output by itself. In this way, the embodiment of the present application can control the voltage value of the second square wave pulse signal through the drive signal generating circuit; since the second square wave pulse signal is a voltage signal obtained after the output signal of the oscillation circuit is stepped down, the embodiment of the present application can realize the adjustment of the voltage value of the output signal of the oscillation circuit, thereby realizing the adjustment of the voltage value of the signal received by the plasma generator.

[0129] In some embodiments of the present application, the low level signal and the high level signal in the first square wave pulse signal are both positive voltage signals; or, the low level signal and the high level signal in the first square wave pulse signal are both negative voltage signals.

[0130] Reference Fig.14 , when the low level signal and the high level signal in the first square wave pulse signal are both positive voltage signals, U1>U2, and the value range of U1 and U2 is generally 0 to 100 kV. Fig.15 When the low-level signal and the high-level signal in the first square wave pulse signal are both negative voltage signals, the value range of U1 and U2 is generally 0 to -100 kV, and the absolute value of U1 is greater than the absolute value of U2.

[0131] It can be seen that the first square wave pulse signal is a voltage signal that does not cross zero. Therefore, both the low level signal and the high level signal in the first square wave pulse signal can drive the plasma generator to work, which is beneficial to maintaining the air purification effect of the plasma generator.

[0132] In some embodiments of the present application, when the low-level signal and the high-level signal in the first square wave pulse signal are both positive voltage signals, the voltage value of the target type signal in the first square wave pulse signal is positively correlated with the voltage value of the target type signal of the third square wave pulse signal; that is, when the first square wave pulse signal output by the voltage signal processing circuit 30 is a positive voltage signal, the higher the voltage value of the target type signal in the first square wave pulse signal, the higher the voltage value of the target type signal of the third square wave pulse signal.

[0133] In an embodiment of the present application, the voltage value of the target type signal of the third square wave pulse signal is recorded as the third voltage value, and the working mode adopted by the driving signal generating circuit when the low level signal and the high level signal in the first square wave pulse signal are both positive voltage signals is recorded as the first working mode.

[0134] The drive signal generating circuit 102 is used to increase the voltage value of the drive signal when operating in the first operating mode and the first voltage value is greater than the third voltage value, and to reduce the voltage value of the drive signal when the first voltage value is less than the third voltage value, so that the first voltage value is equal to the third voltage value.

[0135] In some embodiments, the voltage value of the high-level signal of the square wave pulse signal received at the second input terminal of the drive signal generating circuit is recorded as V3, and the voltage value of the low-level signal of the square wave pulse signal received at the second input terminal of the drive signal generating circuit is recorded as V4. When the square wave pulse signal received at the second input terminal of the drive signal generating circuit is a third square wave pulse signal, V3 and V4 are both third voltage values.

[0136] Here, when the driving signal generating circuit operates in the first operating mode, the process of controlling the voltage value, frequency and duty cycle of the first square wave pulse signal received by the plasma generator is similar to the process of controlling the voltage value, frequency and duty cycle of the first square wave pulse signal received by the plasma generator. Fig.13 When the drive signal generating circuit operates in the first operating mode, if the DC power supply is turned on, the control signal generating circuit, the drive signal generating circuit, the oscillation circuit, the voltage signal processing circuit, the plasma generator and the second sampling circuit can operate normally.

[0137] It can be seen that the drive signal generating circuit can control the voltage value of the drive signal output by itself by comparing the voltage value of the target type signal of the basic square wave pulse signal with the voltage value of the target type signal of the third wave pulse signal. When the voltage value of the target type signal of the basic square wave pulse signal and the voltage value of the target type signal of the third wave pulse signal are not equal, the voltage value of the basic square wave pulse signal and the voltage value of the third wave pulse signal are made equal by adjusting the voltage value of the drive signal output by itself. In this way, the embodiment of the present application can control the voltage value of the third wave pulse signal through the drive signal generating circuit; since the third wave pulse signal is a voltage signal obtained after the output signal of the oscillation circuit is stepped down, the embodiment of the present application can realize the adjustment of the voltage value of the output signal of the oscillation circuit, thereby realizing the adjustment of the voltage value of the signal received by the plasma generator.

[0138] In some embodiments of the present application, when the low-level signal and the high-level signal in the first square wave pulse signal are both negative voltage signals, the absolute value of the voltage value of the target type signal in the first square wave pulse signal is negatively correlated with the voltage value of the target type signal of the third square wave pulse signal; that is, when the first square wave pulse signal output by the voltage signal processing circuit 30 is a negative voltage signal, the higher the absolute value of the voltage value of the target type signal in the first square wave pulse signal, the lower the voltage value of the target type signal of the third square wave pulse signal.

[0139] In the embodiment of the present application, the working mode adopted by the driving signal generating circuit when the low-level signal and the high-level signal in the first square wave pulse signal are both negative voltage signals is recorded as the second working mode.

[0140] The drive signal generating circuit 102 is used to increase the voltage value of the drive signal when operating in the second operating mode and the first voltage value is less than the third voltage value, and to reduce the voltage value of the drive signal when the first voltage value is greater than the third voltage value, so that the first voltage value is equal to the third voltage value.

[0141] In some embodiments, the voltage value of the high-level signal of the square wave pulse signal received at the second input terminal of the drive signal generating circuit is recorded as V3, and the voltage value of the low-level signal of the square wave pulse signal received at the second input terminal of the drive signal generating circuit is recorded as V4. When the square wave pulse signal received at the second input terminal of the drive signal generating circuit is a third square wave pulse signal, V3 and V4 are both third voltage values.

[0142] Reference Fig.16 When the driving signal generating circuit 102 operates in the second operating mode, the process of controlling the voltage value, frequency and duty cycle of the first square wave pulse signal received by the plasma generator may include:

[0143] Step 1600: Turn on the DC power supply, and then, step 1601 and step 1607 may be performed.

[0144] Here, the DC power supply is the power supply for the plasma generating device; after the DC power supply is turned on, the control signal generating circuit, the drive signal generating circuit, the oscillation circuit, the voltage signal processing circuit, the plasma generator and the second sampling circuit can work normally.

[0145] Step 1601: Determine the voltage value V1 of the high level signal of the basic square wave pulse signal.

[0146] Step 1602: Determine whether V1 is less than V3, if yes, execute step 1603, if no, execute step 1604.

[0147] Step 1603 : Increase the voltage value of the driving signal, and then execute step 1605 .

[0148] Step 1604 : reduce the voltage value of the driving signal, and then execute step 1605 .

[0149] Step 1605: Determine whether V1 is equal to V3, if yes, execute step 1606, if no, return to step 1602.

[0150] Step 1606 : Determine the voltage value U1 of the high level signal of the first square wave pulse signal, and then execute step 1613 .

[0151] Here, U1=V1*X, X represents the voltage amplification factor of the signal amplification part, and the signal amplification part includes an oscillation circuit and a voltage signal processing circuit.

[0152] Step 1607: Determine the voltage value V2 of the low-level signal of the basic square wave pulse signal.

[0153] Step 1608: Determine whether V2 is less than V4, if yes, execute step 1609, if no, execute step 1610.

[0154] Step 1609 : Increase the voltage value of the driving signal, and then execute step 1611 .

[0155] Step 1610 : reduce the voltage value of the driving signal, and then execute step 1611 .

[0156] Step 1611: Determine whether V2 is equal to V4, if yes, execute step 1612, if no, return to step 1608.

[0157] Step 1612: Determine the voltage value U2 of the low level signal of the first square wave pulse signal.

[0158] Here, U1=V2*X, and since V1>V2, U1>U2.

[0159] In the embodiment of the present application, steps 1602 to 1612 can be implemented based on a driving signal generating circuit.

[0160] Step 1613: Determine the frequency and duty cycle of the first square wave pulse signal, and then the process can be ended.

[0161] In an embodiment of the present application, the drive signal generating circuit can control the frequency and duty cycle of the drive signal according to the frequency and duty cycle of the basic square wave pulse signal, thereby controlling the frequency and duty cycle of the first square wave pulse signal; here, the frequency of the first square wave pulse signal and the frequency of the basic square wave pulse signal are both f, and the duty cycle of the first square wave pulse signal and the duty cycle of the basic square wave pulse signal are both d. It can be seen that the duration of the high-level signal in the first square wave pulse signal within a signal cycle is t1, and the duration of the low-level signal in the first square wave pulse signal within a signal cycle is t2.

[0162] It can be seen that the drive signal generating circuit can control the voltage value of the drive signal output by itself by comparing the voltage value of the target type signal of the basic square wave pulse signal with the voltage value of the target type signal of the third wave pulse signal. When the voltage value of the target type signal of the basic square wave pulse signal and the voltage value of the target type signal of the third wave pulse signal are not equal, the voltage value of the basic square wave pulse signal and the voltage value of the third wave pulse signal are made equal by adjusting the voltage value of the drive signal output by itself. In this way, the embodiment of the present application can control the voltage value of the third wave pulse signal through the drive signal generating circuit; since the third wave pulse signal is a voltage signal obtained after the output signal of the oscillation circuit is stepped down, the embodiment of the present application can realize the adjustment of the voltage value of the output signal of the oscillation circuit, thereby realizing the adjustment of the voltage value of the signal received by the plasma generator.

[0163] The embodiment of the present application proposes a plasma generating device, which can be applied to indoor air conditioning sterilization, deodorization and other scenarios. The embodiment of the present application can use a square wave pulse signal to drive the plasma generator to work. When the high-level signal of the square wave pulse signal is used to drive the plasma generator to work, the effect of ionizing the air can be improved, and the air purification effect can be improved; by switching the high and low levels of the square wave pulse signal, the plasma generator can generate a changing electric field, thereby enhancing the air purification effect. At the same time, the low-level signal of the square wave pulse signal is used to drive the plasma generator to work, which can reduce the ozone concentration to a certain extent. The embodiment of the present application can solve the problem that the higher the voltage of the plasma generator, the better the air purification effect, but the voltage increase causes the ozone to exceed the standard and cannot be used in the indoor environment. It can realize the combined application of a plasma generator driven by a high-voltage square wave pulse signal and air conditioning to purify the air.

[0164] Furthermore, the embodiment of the present application can adjust the voltage amplitude, frequency and duty cycle of the first square wave pulse signal received by the plasma generator through the driving signal generating circuit, that is, the voltage amplitude, frequency and duty cycle of the first square wave pulse signal received by the plasma generator can be adjusted according to actual needs. Therefore, the plasma generator in the embodiment of the present application can be any type of plasma generator, and the embodiment of the present application can adapt to different plasma generators and make them work in the best state.

[0165] An embodiment of the present application also provides an air conditioner, comprising any one of the above-mentioned plasma generating devices.

[0166] An embodiment of the present application also provides an electronic device, comprising any one of the above-mentioned plasma generating devices.

[0167] Based on the plasma generating device proposed in the above-mentioned embodiment, the embodiment of the present application further proposes a circuit control method.

[0168] Fig.17 is a flow chart of a circuit control method according to an embodiment of the present application, and the circuit control method is applied to the plasma generating device described above, referring to Fig.17 , the method may include:

[0169] Step 1701: Generate a driving signal.

[0170] Step 1702: Convert the DC voltage signal into an AC voltage signal based on the driving signal.

[0171] Step 1703: Boost the AC voltage signal, and rectify the boosted AC voltage signal to obtain a first square wave pulse signal.

[0172] Step 1704: Output the first square wave pulse signal to the plasma generator.

[0173] In some embodiments, after generating the drive signal, the method also includes: stepping down the AC voltage signal into a second square wave pulse signal; generating a basic square wave pulse signal; comparing the voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal to obtain a first comparison result, and adjusting the voltage value of the drive signal according to the first comparison result so that the voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal are equal.

[0174] In some embodiments, the amplitude of the target type signal in the first square wave pulse signal is positively correlated with the voltage value of the target type signal of the second square wave pulse signal, and the target type signal is a high level signal or a low level signal; adjusting the voltage value of the drive signal according to the first comparison result so that the voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal are equal includes: when the first voltage value is greater than the second voltage value, increasing the voltage value of the drive signal, and when the first voltage value is less than the second voltage value, decreasing the voltage value of the drive signal so that the first voltage value is equal to the second voltage value; the first voltage value represents the voltage value of the target type signal of the basic square wave pulse signal, and the second voltage value represents the voltage value of the target type signal of the second square wave pulse signal.

[0175] In some embodiments, after generating the driving signal, the method also includes: reducing the voltage of the first square wave pulse signal and converting it into a third wave pulse signal; generating a basic square wave pulse signal; comparing the voltage values ​​of the basic square wave pulse signal and the third wave pulse signal to obtain a second comparison result, and adjusting the voltage value of the driving signal according to the second comparison result so that the voltage values ​​of the basic square wave pulse signal and the third wave pulse signal are equal.

[0176] In some embodiments, the low level signal and the high level signal in the first square wave pulse signal are both positive voltage signals, the voltage value of the target type signal in the first square wave pulse signal is positively correlated with the voltage value of the target type signal in the third square wave pulse signal, and the target type signal is a high level signal or a low level signal;

[0177] The step of adjusting the voltage value of the driving signal according to the second comparison result so that the voltage values ​​of the basic square wave pulse signal and the third square wave pulse signal are equal includes: when the first voltage value is greater than the third voltage value, increasing the voltage value of the driving signal; when the first voltage value is less than the third voltage value, decreasing the voltage value of the driving signal so that the first voltage value is equal to the third voltage value; the first voltage value represents the voltage value of the target type signal of the basic square wave pulse signal, and the third voltage value represents the voltage value of the target type signal of the third square wave pulse signal.

[0178] In some embodiments, the low level signal and the high level signal in the first square wave pulse signal are both negative voltage signals, the absolute value of the voltage value of the target type signal in the first square wave pulse signal is negatively correlated with the voltage value of the target type signal of the third square wave pulse signal, and the target type signal is a high level signal or a low level signal;

[0179] The step of adjusting the voltage value of the driving signal according to the second comparison result so that the voltage values ​​of the basic square wave pulse signal and the third square wave pulse signal are equal includes: when the first voltage value is less than the third voltage value, increasing the voltage value of the driving signal, and when the first voltage value is greater than the third voltage value, decreasing the voltage value of the driving signal so that the first voltage value is equal to the third voltage value; the first voltage value represents the voltage value of the target type signal of the basic square wave pulse signal, and the third voltage value represents the voltage value of the target type signal of the third square wave pulse signal.

[0180] In some embodiments, generating the driving signal includes: determining the frequency of the basic square wave pulse signal as the frequency of the driving signal; and generating the driving signal according to the frequency of the driving signal.

[0181] In some embodiments, generating the driving signal includes: determining the duty cycle of the basic square wave pulse signal as the duty cycle of the driving signal; and generating the driving signal according to the duty cycle of the driving signal.

[0182] Those skilled in the art will appreciate that, in the above method of specific implementation, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0183] It should be noted that the description of the above method embodiment is similar to the description of the above device embodiment, and has similar beneficial effects as the device embodiment. For technical details not disclosed in the device embodiment of the present application, please refer to the description of the device embodiment of the present application for understanding.

[0184] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0185] The methods disclosed in the various method embodiments provided in this application can be arbitrarily combined without conflict to obtain new method embodiments.

[0186] The features disclosed in the various product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0187] The features disclosed in the various method or device embodiments provided in this application can be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0188] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0189] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A plasma generating device, characterized in that: It includes a signal generating circuit, an oscillating circuit, a voltage signal processing circuit and a plasma generator; The signal generating circuit is used to output a driving signal; the oscillation circuit is used to receive a DC voltage signal, convert the DC voltage signal into an AC voltage signal based on the driving signal, and output the AC voltage signal to the voltage signal processing circuit; the voltage signal processing circuit is at least used to boost the AC voltage signal to obtain a first square wave pulse signal, and output the first square wave pulse signal to the plasma generator.

2. The device according to claim 1, characterized in that The device also includes: a first sampling circuit, wherein a sampling end of the first sampling circuit is connected to the oscillation circuit; the signal generating circuit includes a control signal generating circuit and a drive signal generating circuit; the output end of the control signal generating circuit is connected to the first input end of the drive signal generating circuit, and the output end of the first sampling circuit is connected to the second input end of the drive signal generating circuit; the output end of the drive signal generating circuit is connected to the input end of the oscillation circuit.

3. The device according to claim 1, characterized in that The device also includes: a second sampling circuit, a sampling end of the second sampling circuit is connected to the voltage signal processing circuit; the signal generating circuit includes a control signal generating circuit and a drive signal generating circuit; the output end of the control signal generating circuit is connected to the first input end of the drive signal generating circuit, and the output end of the second sampling circuit is connected to the second input end of the drive signal generating circuit; the output end of the drive signal generating circuit is connected to the input end of the oscillation circuit.

4. The device according to claim 2 or 3, characterized in that The amplitude of the high-level signal of the pulse signal output by the control signal generating circuit is between 0 and 20 V, and the amplitude of the low-level signal of the pulse signal output by the control signal generating circuit is between 0 and 20 V.

5. The device according to claim 2 or 3, characterized in that: The frequency of the pulse signal output by the control signal generating circuit is less than 20 Hz.

6. The device according to claim 2 or 3, characterized in that: The duty cycle of the pulse signal output by the control signal generating circuit is between 5% and 95%.

7. The device according to any one of claims 1 to 3, characterized in that: The voltage signal processing circuit includes a boost circuit for boosting the AC voltage signal and a rectifier circuit; the rectifier circuit is used to rectify the boosted AC voltage signal to obtain a first square wave pulse signal, and output the first square wave pulse signal to the plasma generator.

8. The device according to any one of claims 1 to 3, characterized in that The amplitude of the high level signal of the first square wave pulse signal is between 10kv and 20kv; the amplitude of the low level signal of the first square wave pulse signal is greater than 0v and less than 7kv.

9. The device according to any one of claims 1 to 3, characterized in that: The frequency of the first square wave pulse signal is less than 20 Hz.

10. The device according to any one of claims 1 to 3, characterized in that The duty cycle of the first square wave pulse signal is between 5% and 95%.

11. The device according to any one of claims 1 to 3, characterized in that The low level signal and the high level signal in the first square wave pulse signal are both positive voltage signals; or, the low level signal and the high level signal in the first square wave pulse signal are both negative voltage signals.

12. An air conditioner, characterized in that: A plasma generating device comprising the plasma generating device according to any one of claims 1 to 11.

13. An electronic device, characterized in that: A plasma generating device comprising the plasma generating device according to any one of claims 1 to 11.

14. A circuit control method, characterized in that: Applied to the plasma generating device according to any one of claims 1 to 11, the method comprises: generating a driving signal; converting a DC voltage signal into an AC voltage signal based on the driving signal; Boosting the AC voltage signal, and rectifying the boosted AC voltage signal to obtain a first square wave pulse signal; The first square wave pulse signal is output to the plasma generator.

15. The method according to claim 14, characterized in that After generating the driving signal, the method further includes: Stepping down the AC voltage signal and converting it into a second square wave pulse signal; Generate a basic square wave pulse signal; The voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal are compared to obtain a first comparison result, and the voltage value of the drive signal is adjusted according to the first comparison result so that the voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal are equal.

16. The method according to claim 15, characterized in that The amplitude of the target type signal in the first square wave pulse signal is positively correlated with the voltage value of the target type signal in the second square wave pulse signal, and the target type signal is a high level signal or a low level signal; The step of adjusting the voltage value of the driving signal according to the first comparison result so that the voltage values ​​of the basic square wave pulse signal and the second square wave pulse signal are equal includes: When the first voltage value is greater than the second voltage value, the voltage value of the driving signal is increased, and when the first voltage value is less than the second voltage value, the voltage value of the driving signal is decreased so that the first voltage value is equal to the second voltage value; The first voltage value represents a voltage value of a target type signal of the basic square wave pulse signal, and the second voltage value represents a voltage value of a target type signal of the second square wave pulse signal.

17. The method according to claim 14, characterized in that After generating the driving signal, the method further includes: Converting the first square wave pulse signal into a third square wave pulse signal by reducing the voltage thereof; Generate a basic square wave pulse signal; The voltage values ​​of the basic square wave pulse signal and the third wave pulse signal are compared to obtain a second comparison result, and the voltage value of the drive signal is adjusted according to the second comparison result so that the voltage values ​​of the basic square wave pulse signal and the third wave pulse signal are equal.

18. The method according to claim 17, characterized in that The low level signal and the high level signal in the first square wave pulse signal are both positive voltage signals, the voltage value of the target type signal in the first square wave pulse signal is positively correlated with the voltage value of the target type signal in the third square wave pulse signal, and the target type signal is a high level signal or a low level signal; The step of adjusting the voltage value of the driving signal according to the second comparison result so that the voltage values ​​of the basic square wave pulse signal and the third wave pulse signal are equal includes: When the first voltage value is greater than the third voltage value, the voltage value of the drive signal is increased; when the first voltage value is less than the third voltage value, the voltage value of the drive signal is reduced so that the first voltage value is equal to the third voltage value; the first voltage value represents the voltage value of the target type signal of the basic square wave pulse signal, and the third voltage value represents the voltage value of the target type signal of the third square wave pulse signal.

19. The method according to claim 17, characterized in that The low level signal and the high level signal in the first square wave pulse signal are both negative voltage signals, the absolute value of the voltage value of the target type signal in the first square wave pulse signal is negatively correlated with the voltage value of the target type signal of the third square wave pulse signal, and the target type signal is a high level signal or a low level signal; The step of adjusting the voltage value of the driving signal according to the second comparison result so that the voltage values ​​of the basic square wave pulse signal and the third wave pulse signal are equal includes: When the first voltage value is less than the third voltage value, the voltage value of the driving signal is increased, and when the first voltage value is greater than the third voltage value, the voltage value of the driving signal is decreased so that the first voltage value is equal to the third voltage value; The first voltage value represents a voltage value of a target type signal of the basic square wave pulse signal, and the third voltage value represents a voltage value of a target type signal of the third square wave pulse signal.

20. The method according to any one of claims 15 to 19, characterized in that The generating of the driving signal comprises: Determining the frequency of the basic square wave pulse signal as the frequency of the driving signal; The driving signal is generated according to the frequency of the driving signal.

21. The method according to any one of claims 15 to 19, characterized in that The generating of the driving signal comprises: Determining the duty cycle of the basic square wave pulse signal as the duty cycle of the driving signal; The driving signal is generated according to the duty cycle of the driving signal.

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