A filter circuit and a filter circuit control method

Abstract

The application provides a filter circuit and a filter circuit control method, and relates to the technical field of filtering. The filter circuit control method is applied to a controller of a filter circuit. The filter circuit further comprises a plurality of filter modules, and the filter bands of each filter module are different. When a device to be filtered is connected, the power of the device to be filtered is acquired, then the type of the device to be filtered is determined according to the power of the device to be filtered, the filter band is selected, and the corresponding filter module is controlled to be turned on according to the filter band. The filter circuit and the filter circuit control method have the advantages that the filtering can be customized, and the use is more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filtering, in particular to a filtering circuit and a filtering circuit control method. BACKGROUND

[0002] Wave filtering is an operation of filtering out specific waveband frequencies in a signal, and is an important measure to suppress and prevent interference.

[0003] The filtering socket in the industry does not have targeted protection for electrical appliances, and the protection for specific electrical appliances is not enough, or only targets a specific type of electrical appliance, and does not have broad-spectrum, resulting in the need to select a socket with a corresponding filtering frequency band for different types of electrical appliances, and high use limitations.

[0004] In summary, the prior art has the problem of high use limitations of filtering sockets. SUMMARY

[0005] The present application aims to provide a filtering circuit and a filtering circuit control method to solve the problem of high use limitations of filtering sockets in the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0007] In a first aspect, the embodiments of the present application provide a filtering circuit control method applied to a controller of a filtering circuit, the filtering circuit further comprising a plurality of filtering modules, and each filtering module has a different filtering frequency band, the filtering circuit control method comprising:

[0008] When a device to be filtered is connected, the power of the device to be filtered is obtained;

[0009] The type of the device to be filtered is determined according to the power of the device to be filtered, so as to select a filtering frequency band;

[0010] The corresponding filtering module is controlled to be turned on according to the filtering frequency band.

[0011] Optionally, the step of determining the type of the device to be filtered according to the power of the device to be filtered comprises:

[0012] When the type of the device to be filtered is not matched according to the power of the device to be filtered, type request information is sent to a target intelligent terminal;

[0013] When the selected type fed back by the target intelligent terminal is received, the type of the device to be filtered is determined as the selected type, so as to determine the filtering frequency band;

[0014] The power of the device to be filtered is bound to the selected type and stored.

[0015] Optionally, the filter circuit further comprises an information interaction board, the information interaction board is electrically connected with the controller, and the step of determining the device type according to the power of the device to be filtered comprises:

[0016] When the device type is not matched according to the power of the device to be filtered, type request information is output to the information interaction board;

[0017] When receiving the selected type transmitted by the information interaction board, the device type of the device to be filtered is determined as the selected type to determine the filtering frequency band;

[0018] The power of the device to be filtered is bound with the selected type and stored.

[0019] Optionally, after the step of determining the device type according to the power of the device to be filtered, the method further comprises:

[0020] Type confirmation information is sent to the target intelligent terminal;

[0021] When receiving the locking information fed back by the target intelligent terminal, the filtering frequency band is selected according to the device type;

[0022] When receiving the change information fed back by the target intelligent terminal, the filtering frequency band is selected according to the changed device type.

[0023] Optionally, the step of acquiring the power of the device to be filtered when accessing the device to be filtered comprises:

[0024] When accessing a plurality of devices to be filtered, the power of each device to be filtered is acquired;

[0025] The step of determining the device type according to the power of the device to be filtered to select the filtering frequency band comprises:

[0026] The device type of each device to be filtered is determined according to the power of each device to be filtered to select at least one filtering frequency band.

[0027] In another aspect, the embodiments of the present application also provide a filter circuit, the filter circuit comprises a plurality of filter modules and a controller, and the filtering frequency bands of each filter module are different, and the controller is electrically connected with each filter module; wherein,

[0028] When accessing the device to be filtered, the controller is used to determine the corresponding filtering frequency band of the device to be filtered, and control the corresponding filter module to be turned on.

[0029] Optionally, the plurality of filter modules are connected in parallel, each of the filter modules comprises a driving unit and a filter unit, the driving unit is electrically connected with the filter unit, and the driving unit is electrically connected with the controller; wherein,

[0030] The controller is configured to control the corresponding driving unit to be turned on to drive the filter unit to be turned on.

[0031] Optionally, the driving unit comprises a relay and a switch tube, a first end of the relay is connected with a power supply, a second end of the relay is electrically connected with a first end of the switch tube, a third end of the relay is electrically connected with the filter unit, a control end of the switch tube is electrically connected with the controller, and a second end of the switch tube is grounded.

[0032] Optionally, the filter unit comprises a capacitor and an inductor, the capacitor and the inductor are connected, and the value of the capacitor and the value of the inductor in each of the filter modules are different.

[0033] Optionally, the filter circuit further comprises a first metering module and a second metering module, the first metering module and the second metering module are electrically connected with the controller, the first metering module is electrically connected with an input end of each of the filter modules, and the second metering module is electrically connected with an output end of each of the filter modules; wherein,

[0034] The first metering module and the second metering module are both configured to detect at least a voltage parameter.

[0035] Compared with the prior art, the present application has the following beneficial effects:

[0036] The present application provides a filter circuit and a filter circuit control method. The filter circuit control method is applied to a controller of a filter circuit. The filter circuit further comprises a plurality of filter modules, and the filter frequency bands of each filter module are different. When a device to be filtered is connected, the power of the device to be filtered is obtained. Then, the type of the device to be filtered is determined according to the power of the device to be filtered, so as to select a filter frequency band. The corresponding filter module is controlled to be turned on according to the filter frequency band. Since the type of the device to be filtered can be determined according to the power of the device to be filtered, and the filter frequency band to be selected is determined, the filter circuit provided by the present application can filter different devices, and is more convenient to use.

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0039] Figure 1 A flowchart of a filter circuit control method provided by the embodiments of the present application.

[0040] Figure 2 A flowchart of a filter circuit control method provided by the embodiments of the present application. Figure 1 A flowchart of a sub-step of S104 in the method.

[0041] Figure 3 An interaction diagram of a filter socket and a target intelligent terminal provided by the embodiments of the present application.

[0042] Figure 4 A flowchart of a sub-step of S104 in the method. Figure 1 Another flowchart of a sub-step of S104 in the method.

[0043] Figure 5 Another flowchart of a filter circuit control method provided by the embodiments of the present application.

[0044] Figure 6 A first module diagram of a filter circuit provided by the embodiments of the present application.

[0045] Figure 7 A second module diagram of a filter circuit provided by the embodiments of the present application.

[0046] Figure 8 A circuit diagram of a driving unit provided by the embodiments of the present application.

[0047] Figure 9 A third module diagram of a filter circuit provided by the embodiments of the present application.

[0048] Figure 10 A circuit diagram of a first metering module and a second metering module provided by the embodiments of the present application.

[0049] In the figure: 100-filter circuit; 110-controller; 120-filter module; 121-driving unit; 122-filter unit. DETAILED DESCRIPTION

[0050] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0052] It should be noted that similar reference numerals and letters refer to similar items throughout the following drawings, and therefore, once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings. Meanwhile, in the description of the present application, the terms "first", "second", and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0053] It should be noted that, in this document, the terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0054] The following will describe some embodiments of the present application in detail with reference to the drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0055] As described in the background, the filter socket in the current industry does not have targeted protection for electrical appliance protection, and the protection for specific electrical appliances is not enough, or only targets a specific type of electrical appliance, and does not have broad spectrum.

[0056] For example, if the electrical equipment is a computer, and it is found through research that the sensitive frequency spectrum range of the computer to harmonic and conducted interference is A, a corresponding socket needs to be set, and the frequency range that can be filtered out in the filter module in the socket is A; when the electrical equipment is a rice cooker, the sensitive frequency spectrum range of the rice cooker to harmonic and conducted interference is B, a corresponding socket needs to be set, and the frequency range that can be filtered out in the filter module in the socket is B, and so on. Since there are many electrical equipment in a home for a user, for example, in addition to a computer and a rice cooker, there can be a TV, a sound box, an air conditioner and a series of devices, and different devices have different sensitive frequency spectrum ranges to harmonic and conducted interference, if a filter socket needs to be installed for each device, a large number of filter sockets need to be installed, and each filter socket can only filter a specific frequency range, so the use is limited.

[0057] Therefore, the application provides a filter circuit control method, which realizes targeted filtering of multiple devices through one filter socket by selecting filter modules with different filter frequency bands for different devices.

[0058] The filter circuit control method provided by the application is exemplarily described below.

[0059] As an optional implementation, the filter circuit control method is applied to a controller of a filter circuit, the filter circuit further includes a plurality of filter modules, and each filter module has a different filter frequency band, please refer to Figure 1 , the filter circuit control method includes:

[0060] S102, when a device to be filtered is connected, the power of the device to be filtered is acquired.

[0061] S104, the type of the device to be filtered is determined according to the power of the device to be filtered, so as to select a filter frequency band.

[0062] S108, the corresponding filter module is controlled to be turned on according to the filter frequency band.

[0063] When the electrical equipment is inserted into the socket, a power acquisition module is arranged in the socket, the power acquisition module is electrically connected with the controller, and the power acquisition module can acquire the power of the electrical equipment when the electrical equipment is working.

[0064] Since the power of each type of electrical equipment is different, when the controller acquires the power of the currently inserted electrical equipment, the type of the electrical equipment can be determined from the stored information. For example, the power of a TV is generally 100W, if it is detected that the power of the currently inserted electrical equipment is 100W, it is determined that the electrical equipment is a TV. The power of a rice cooker is 800W, if it is detected that the power of the currently inserted electrical equipment is 100W, it is determined that the electrical equipment is a rice cooker, and so on.

[0065] Of course, when storing data, the type of each electronic device defines a number, for example, the number "01" represents a television, the number "02" represents a rice cooker, the number "03" represents an air conditioner, etc.

[0066] And the number corresponds to the filter frequency band, for example, the filter frequency band corresponding to the number "01" is 100W, and the filter frequency band corresponding to the number "02" is 800W.

[0067] After determining the filter frequency band, the controller can control the corresponding filter module to be turned on, and the filter frequency bands of different filter modules are different.

[0068] For example, the number of filter modules is 4, filter module a is used to filter out A frequency band noise, filter module b is used to filter out B frequency band noise, filter module c is used to filter out C frequency band noise, and filter module d is used to filter out D frequency band noise. The controller can control the corresponding filter module to work according to actual needs.

[0069] It should be noted that the controller described in the present application can be an MCU, and generally speaking, each filter module can filter out noise in a certain frequency band range, for example, filter module a is used to filter out noise in the frequency range of 1000Hz-2000Hz, and filter module b is used to filter out noise in the frequency range of 5000Hz-10000Hz, which is not limited herein. In one implementation, the plurality of filter modules are connected in parallel, so that the filter modules can combine filtering, for example, when filter module a and filter module b are turned on at the same time, the noise they filter out can be noise in the frequency range of 15000Hz-20000Hz, which is not limited herein.

[0070] By the filter circuit control method provided in the present application, the filtering of multiple electronic devices can be realized by one plugboard, the application scenario is more extensive, and the practicality is stronger.

[0071] Since when the electronic device is initially inserted into the socket, although the controller can recognize the power of the electronic device, the corresponding device type cannot be found from the stored data. Therefore, as an implementation, please refer to Figure 2 , S104 includes:

[0072] S1041, when the device type is not matched according to the power of the device to be filtered, type request information is sent to the target intelligent terminal.

[0073] S1042, when receiving the selected type feedback from the target intelligent terminal, the device type of the device to be filtered is determined as the selected type to determine the filter frequency band.

[0074] S1043, the power of the device to be filtered is bound to the selected type and stored.

[0075] That is, in the present application, the socket can be in communication with the intelligent terminal in combination with the application of the Internet of Things. Please refer to Figure 3 , the filter socket can be in communication with the server, and the server is also in communication with the target intelligent terminal. Among them, the filter socket can include a WIFI module, thereby realizing networking, or the filter socket includes a Bluetooth module.

[0076] It should be noted that the target intelligent terminal described in the present application can be a mobile phone, a bracelet, etc. portable terminal.

[0077] Taking the target intelligent terminal as a mobile phone as an example, when the electronic device is first inserted into the filter socket, the filter socket obtains the power of the electronic device, and then sends the same power module to the cloud through the WIFI module, so that the user's mobile phone APP page jumps out and the user selects the type of electrical appliance (such as computer, TV, sound), and the cloud transmits data back to the filter socket according to the user's selection of the type of electrical appliance, and then the controller in the filter socket controls the corresponding filter module to be turned on to customize the protection of the electrical appliance.

[0078] Of course, since the socket has multiple sockets, when multiple devices to be filtered are accessed, the power of each device to be filtered is obtained, and then the type of each device to be filtered is determined according to the power of each device to be filtered, so as to select at least one filter frequency band, and then control the corresponding hole type to be allocated with a matching filter module. For example, the filter module a is used for filtering in the socket 1, the filter module b is used for filtering in the socket 2, or the filter module a is used for filtering in the socket 1 and the socket 2, which is not limited here.

[0079] As another implementation manner, the filter socket can also not be based on the application of the Internet of Things environment, but the type determination when the electronic device is first inserted can be realized by setting an information interaction board on the filter socket. On this basis, please refer to Figure 4 , S104 includes:

[0080] S1044, when the type of the device to be filtered is not matched according to the power of the device to be filtered, outputting a type request information to the information interaction board.

[0081] S1045, when receiving the selected type transmitted by the information interaction board, determining the type of the device to be filtered as the selected type to determine the filter frequency band.

[0082] S1046, binding and storing the power of the device to be filtered with the selected type.

[0083] Among them, the information interaction board can be a touch board such as a liquid crystal screen, or the information interaction board can be provided with a plurality of physical keys, and the user can select the type of the device through the liquid crystal screen or the keys.

[0084] Therefore, when the electronic device is firstly inserted into the filter socket, the filter socket cannot identify the type of the device, at this time, the user needs to be prompted to select the corresponding type on the information interaction board, and then the user selects the type of the device through the touch screen or the key, and the controller can control the corresponding filter module to be turned on to customize the filter.

[0085] It should be noted that, whether the Internet of Things mode or the information interaction board mode is adopted, when the user first inputs the type of the device, the controller will store the data, so that when the electronic device is inserted into the filter socket, the filter socket can directly identify the type thereof, which is more convenient.

[0086] In actual application, the power of two electronic devices may be similar, for example, if the working power of the rice cooker and the air conditioner is 800W, the filter socket cannot effectively identify the category of the two devices after being inserted into the filter socket, and the frequency band of the rice cooker and the air conditioner that needs to be filtered out is also different, so the controller cannot effectively select the corresponding filter module.

[0087] Therefore, as an implementation mode, please refer to Figure 5 After S104, the method further includes:

[0088] S1051, type confirmation information is sent to the target intelligent terminal.

[0089] S1052, when receiving the locking information fed back by the intelligent terminal, the filter frequency band is selected according to the type of the device.

[0090] S1053, when receiving the change information fed back by the intelligent terminal, the filter frequency band is selected according to the changed type of the device.

[0091] When the controller selects the closest type, the user also needs to perform secondary verification, if the user locks the type selected by the controller, the controller selects the filter frequency band according to the type of the device and controls the corresponding filter module to work. If the user does not agree with the type selected by the controller, for example, the controller determines that the electronic device inserted at present is a rice cooker, but the electronic device inserted at present is actually a refrigerator, the user can change the information. Understandably, the priority of the information changed by the user is the highest, therefore, the controller directly selects the filter frequency band according to the changed type of the device and controls the corresponding filter module to work.

[0092] The above example takes the Internet of Things scene as an example, of course, in actual application, the information interaction board mode can also be used for data interaction, which is not limited here.

[0093] Based on the above implementation mode, please refer to Figure 6The embodiment of the present application further provides a filter circuit 100, which comprises a plurality of filter modules 120 and a controller 110, the filter bands of the filter modules 120 are different, and the controller 110 is electrically connected with each filter module 120; when a device to be filtered is connected, the controller 110 is used for determining the filter band corresponding to the device to be filtered, and controlling the corresponding filter module 120 to be turned on.

[0094] As an implementation manner, the plurality of filter modules 120 are connected in parallel, please refer to Figure 7 each filter module 120 comprises a driving unit 121 and a filter unit 122, the driving unit 121 is electrically connected with the filter unit 122, and the driving unit 121 is electrically connected with the controller 110; wherein the controller 110 is used for controlling the corresponding driving unit 121 to be turned on, so as to drive the filter unit 122 to be turned on.

[0095] In an implementation manner, the driving unit 121 is as shown in Figure 8 The driving unit 121 comprises a relay and a switch tube, the first end of the relay is connected with a power supply, the second end is electrically connected with the first end of the switch tube, the third end is electrically connected with the filter unit 122, the control end of the switch tube is electrically connected with the controller 110, and the second end of the switch tube is grounded. Figure 8 In the implementation manner, the switch tube is a triode, the base of the triode is connected with the controller 110 through a resistor R23, and the resistor R23 and a resistor R24 form a voltage dividing circuit to provide a driving voltage for the base of the triode. When the switch tube is turned on, the relay is closed, so that the switch is closed, when the triode is turned off, no current flows through the relay, so that the switch is turned off, and the port ACL of the relay can be connected with the filter unit 122, so that the filter unit 122 works when the relay is turned on.

[0096] Optionally, the filter unit 122 comprises a capacitor and an inductor, the capacitor is connected with the inductor, and the capacitance value and the inductance value in each filter module 120 are different, for example, the capacitance value and the inductance value of each filter unit 122 are different, or the inductance values of part of the filter units 122 are the same, and the capacitance values are different, which is not limited herein.

[0097] Of course, the filter circuit 100 further comprises other modules, for example, please refer to Figure 9 The filter circuit 100 further comprises a first metering module, a second metering module and a surge protection module, the first metering module and the second metering module are electrically connected with the controller 110, the first metering module is electrically connected with the input end of each filter module 120, and the second metering module is electrically connected with the output end of each filter module 120; wherein the first metering module and the second metering module are used for detecting at least a voltage parameter.

[0098] The first metering module and the second metering module are arranged to obtain the voltage parameters before and after filtering, and thus the feedback filtering effect can be determined.

[0099] As an implementation manner, refer to Figure 10 The first metering module and the second metering module each include the third resistor R3 to the eleventh resistor R11, the fifth capacitor C5 to the eighth capacitor C8, and the electric quantity metering chip U1, and the connection relationship is as shown in Figure 10 .

[0100] To sum up, the application provides a filtering circuit and a filtering circuit control method. The filtering circuit control method is applied to a controller of the filtering circuit. The filtering circuit further includes a plurality of filtering modules, and the filtering frequency bands of the filtering modules are different. When a device to be filtered is connected, the power of the device to be filtered is obtained, and then the type of the device to be filtered is determined according to the power of the device to be filtered, so as to select a filtering frequency band, and the corresponding filtering module is controlled to be turned on according to the filtering frequency band. Since the type of the device to be filtered can be determined according to the power of the device to be filtered, and then the filtering frequency band to be filtered is selected, the filtering circuit provided by the application can filter different devices, and is more convenient to use.

[0101] The above only describes the preferred embodiments of the application and is not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

[0102] It is obvious for those skilled in the art that the application is not limited to the details of the above exemplary embodiments, and the application can be implemented in other specific forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the application. Any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A filter circuit control method characterized by, The application relates to a controller applied to a filter circuit in a filter socket, wherein the filter circuit further comprises a plurality of filter modules, the filter bands of the filter modules are different, and the filter circuit control method comprises the following steps: When a device to be filtered is connected, the power of the device to be filtered is acquired; The device type of the device to be filtered is determined according to the power, so as to select a filter band; The corresponding filter module is controlled to be turned on according to the filter band. When a plurality of devices to be filtered are connected, the power of each device to be filtered is acquired, and the device type of each device to be filtered is determined according to the power, so as to select at least one filter band.

2. The filter circuit control method according to claim 1, wherein The step of determining the device type according to the power of the device to be filtered comprises the following steps: When the device type is not matched according to the power of the device to be filtered, type request information is sent to a target intelligent terminal; When the selected type fed back by the target intelligent terminal is received, the device type of the device to be filtered is determined as the selected type, so as to determine the filter band; The power of the device to be filtered is bound to the selected type and stored.

3. The filter circuit control method according to claim 1, wherein The filter circuit further comprises an information interaction board, the information interaction board is electrically connected with the controller, and the step of determining the device type according to the power of the device to be filtered comprises the following steps: When the device type is not matched according to the power of the device to be filtered, type request information is output to the information interaction board; When the selected type transmitted by the information interaction board is received, the device type of the device to be filtered is determined as the selected type, so as to determine the filter band; The power of the device to be filtered is bound to the selected type and stored.

4. The filter circuit control method of claim 1, wherein After the step of determining the device type according to the power of the device to be filtered, the method further comprises the following steps: Type confirmation information is sent to a target intelligent terminal; When the locking information fed back by the target intelligent terminal is received, the filter band is selected according to the device type; When the change information fed back by the target intelligent terminal is received, the filter band is selected according to the changed device type.

5. A filter circuit, characterized by The filter circuit comprises a plurality of filter modules and a controller, the controller is used for executing the filter circuit control method according to any one of claims 1 to 4, the filter bands of the filter modules are different, the controller is electrically connected with each filter module; wherein, When a device to be filtered is connected, the controller is used for determining the filter band corresponding to the device to be filtered and controlling the corresponding filter module to be turned on.

6. The filter circuit of claim 5, wherein, The plurality of filter modules are connected in parallel, each filter module comprises a driving unit and a filter unit, the driving unit is electrically connected with the filter unit, and the driving unit is electrically connected with the controller; wherein, The controller is used for controlling the corresponding driving unit to be turned on, so as to drive the filter unit to be turned on.

7. The filter circuit of claim 6, wherein, The driving unit comprises a relay and a switch tube, the first end of the relay is connected with a power supply, the second end of the relay is electrically connected with the first end of the switch tube, the third end of the relay is electrically connected with the filter unit, the control end of the switch tube is electrically connected with the controller, and the second end of the switch tube is grounded.

8. The filter circuit of claim 6, wherein, The filter units comprise capacitors and inductors connected together, and the capacitor value and the inductor value in each filter module are different.

9. The filter circuit of claim 5, wherein, The filter circuit further comprises a first metering module and a second metering module, the first metering module and the second metering module are electrically connected with the controller, the first metering module is electrically connected with the input end of each filter module, and the second metering module is electrically connected with the output end of each filter module; wherein, The first metering module and the second metering module are both used for detecting at least a voltage parameter.

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