CN114584091B - Multilayer EMI filter and filtering control system thereof - Google Patents
Multilayer EMI filter and filtering control system thereof Download PDFInfo
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- CN114584091B CN114584091B CN202210274600.1A CN202210274600A CN114584091B CN 114584091 B CN114584091 B CN 114584091B CN 202210274600 A CN202210274600 A CN 202210274600A CN 114584091 B CN114584091 B CN 114584091B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention provides a multilayer EMI filter and a filtering control system thereof, wherein the filter comprises a multilayer acquisition module and a filtering control module, the multilayer acquisition module is used for acquiring a plurality of groups of power signals, the filtering control module comprises a filtering unit and a corresponding connection unit, the filtering unit is used for filtering interference signals of the plurality of groups of power signals, the corresponding connection unit is used for independently connecting the plurality of groups of power signals, the multilayer acquisition module comprises a plurality of groups of independent acquisition units, the multilayer acquisition module is configured with independent acquisition strategies, and the independent acquisition strategies comprise: the invention can improve the filtering accuracy of the multi-layer interference signals so as to solve the problems of lower pertinence and accuracy of the filtering of the existing filter.
Description
Technical Field
The invention relates to the technical field of filtering control, in particular to a multilayer EMI filter and a filtering control system thereof.
Background
Electromagnetic interference (Electromagnetic Interference, EMI for short), the transliteration is electromagnetic interference. The interference phenomenon generated after the electromagnetic wave acts on the electronic element is two kinds of conduction interference and radiation interference. Conductive interference refers to coupling (interfering) signals on one electrical network to another electrical network through a conductive medium. The filter is a filter circuit composed of a capacitor, an inductor and a resistor. The filter can effectively filter the frequency points of the specific frequency or the frequencies outside the frequency points in the power line to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency.
In the prior art, the applicability of the existing filter to the filtering of each group of signals is lower in the filtering process of the plurality of groups of signals, and when the signals change, the existing filtering control system is difficult to deal with the changes of the signals, so that the original normal signals passing through the existing filter are likely to be filtered, and the equipment cannot normally operate.
Disclosure of Invention
Aiming at the defects of the prior art, the multi-layer EMI filter and the filtering control system thereof can improve the filtering accuracy of multi-layer interference signals so as to solve the problems of lower pertinence and accuracy of the filtering of the prior filter.
In order to achieve the above object, the present invention is realized by the following technical scheme: a multilayer EMI filter, the filter comprising a multilayer acquisition module and a filtering control module, the multilayer acquisition module being used for acquiring a plurality of groups of power supply signals;
the filtering control module comprises a filtering unit and a corresponding connection unit, wherein the filtering unit is used for filtering interference signals of multiple groups of power signals, and the corresponding connection unit is used for conducting independent circuit connection on the multiple groups of power signals.
Further, the multi-layer acquisition module comprises a plurality of groups of independent acquisition units, the multi-layer acquisition module is configured with an independent acquisition strategy, and the independent acquisition strategy comprises: and setting a signal acquisition frequency band with a certain range for each group of independent acquisition units, and controlling each group of independent acquisition units to acquire independent signals.
Further, the filtering unit comprises a plurality of groups of low-pass filtering subunits, a plurality of groups of high-pass filtering subunits, a plurality of groups of band-stop filtering subunits and a plurality of groups of all-pass filtering subunits, wherein the low-pass filtering subunits are used for filtering high-frequency signals; the high-pass filtering subunit is used for filtering low-frequency signals; the band-pass filtering subunit is used for filtering signals lower than or higher than a set frequency band; the band-reject filter subunit is used for filtering signals in a set frequency band; the all-pass filtering subunit is used for carrying out delay output on signals of the set frequency band.
Further, the low-pass filtering subunit is configured with a low-pass filtering strategy, where the low-pass filtering strategy includes: obtaining a low-pass filtering frequency band according to a low-pass filtering formula, and filtering signals in the corresponding low-pass filtering frequency band;
the high-pass filtering subunit is configured with a high-pass filtering strategy, and the high-pass filtering strategy comprises: obtaining a high-pass filtering frequency band according to a high-pass filtering formula, and filtering signals in the corresponding high-pass filtering frequency band;
the band-pass filtering subunit is configured with a band-pass filtering strategy, and the band-pass filtering strategy comprises: obtaining a bandpass set frequency band according to a bandpass filtering formula, and filtering a signal frequency band which is larger than or smaller than a first bandpass threshold of the bandpass set frequency band;
the bandstop filtering subunit is configured with a bandstop filtering strategy, and the bandstop filtering strategy comprises: obtaining a band-stop filtering frequency band according to a band-stop filtering formula, adding and subtracting a first band-stop filtering threshold value according to the band-stop filtering frequency band to obtain a band-stop filtering range, and filtering a signal frequency band in the band-stop filtering range;
the all-pass filtering subunit is configured with an all-pass filtering strategy, and the all-pass filtering strategy comprises: and obtaining the all-pass delay time according to an all-pass filtering formula, and outputting signals of the set frequency band according to the all-pass delay time.
Further, the low pass filtering formula is configured to:the method comprises the steps of carrying out a first treatment on the surface of the The high-pass filtering formula is configured to: />The method comprises the steps of carrying out a first treatment on the surface of the The band-pass filtering formula is configured as follows: />The method comprises the steps of carrying out a first treatment on the surface of the The band-reject filter formula is configured to: />The method comprises the steps of carrying out a first treatment on the surface of the The all-pass filtering formula is configured as follows: />The method comprises the steps of carrying out a first treatment on the surface of the Wherein Pdtl is a low-pass filtered frequency band, pdsd is a low-pass acquired value, pdc is a low-pass reference value, k1 is a low-pass conversion coefficient, pgtl is a high-pass filtered frequency band, pgsd is a high-pass acquired value, pgc is a high-pass reference value, k2 is a high-pass conversion coefficient, pdts is a band-pass set frequency band, pdtc is a band-pass reference value, k3 is a band-pass conversion coefficient, pdzs is a band-stop filtered frequency band, pdzc is a band-stop referenceThe value k4 is the band-stop conversion coefficient, tys is the all-pass delay time length, pqtc is the all-pass reference value, and T1 is the all-pass delay conversion coefficient.
Further, the corresponding connection unit is configured with a corresponding connection policy, which includes: numbering signals passing through a plurality of groups of low-pass filtering subunits, and sequentially setting the signals as Xd1 to Xda, wherein Xd1 is the signal number passing through a first group of low-pass filtering subunits, xda is the signal number passing through an a-th group of low-pass filtering subunits, a represents the number of the low-pass filtering subunits, and the signals passing through the numbered low-pass filtering subunits are respectively connected with corresponding circuits;
numbering signals passing through a plurality of groups of high-pass filtering subunits, and sequentially setting the signals as Xg1 to Xgb, wherein Xg1 is the signal number passing through a first group of high-pass filtering subunits, xgb is the signal number passing through a b group of high-pass filtering subunits, b represents the number of the high-pass filtering subunits, and the signals passing through the numbered high-pass filtering subunits are respectively connected with corresponding circuits;
numbering signals passing through a plurality of groups of band-pass filtering subunits, and sequentially setting the signals as Xdt to Xdtc, wherein Xdt is the number of the signals passing through the first group of band-pass filtering subunits, xdtc is the number of the signals passing through the c-th group of band-pass filtering subunits, c represents the number of the band-pass filtering subunits, and the signals passing through the numbered band-pass filtering subunits are respectively connected with corresponding circuits;
numbering signals passing through a plurality of groups of band-stop filtering subunits, and sequentially setting the signals as Xdz to Xdzd, wherein Xdz is the signal number passing through a first group of low-band-stop filtering subunits, xdzd is the signal number passing through a d group of band-stop filtering subunits, d represents the number of low-pass filtering subunits, and the signals passing through the numbered low-pass filtering subunits are respectively connected with corresponding circuits;
and numbering signals passing through a plurality of groups of all-pass filtering subunits, and sequentially setting the signals as Xq1 to Xqe, wherein Xq1 is the signal number passing through a first group of all-pass filtering subunits, xqe is the signal number passing through an e-th group of all-pass filtering subunits, e represents the number of all-pass filtering subunits, and the signals passing through the numbered all-pass filtering subunits are respectively connected with corresponding circuits.
The filtering control system of the multilayer EMI filter comprises a filtering unit and a corresponding connection unit, wherein the filtering unit is used for filtering interference signals of a plurality of groups of power supply signals;
the corresponding connection units are used for performing independent circuit connection on the multiple groups of power supply signals.
Further, the filtering unit comprises a plurality of groups of low-pass filtering subunits, a plurality of groups of high-pass filtering subunits, a plurality of groups of band-stop filtering subunits and a plurality of groups of all-pass filtering subunits, wherein the low-pass filtering subunits are used for filtering high-frequency signals; the high-pass filtering subunit is used for filtering low-frequency signals; the band-pass filtering subunit is used for filtering signals lower than or higher than a set frequency band; the band-reject filter subunit is used for filtering signals in a set frequency band; the all-pass filtering subunit is used for carrying out delay output on signals of the set frequency band.
The invention has the beneficial effects that: the filter comprises a multi-layer acquisition module and a filtering control module, wherein the multi-layer acquisition module can acquire a plurality of groups of power signals, the filtering control module comprises a filtering unit and a corresponding connection unit, the filtering unit can filter the interference signals of the plurality of groups of power signals, the corresponding connection unit can carry out independent circuit connection on the plurality of groups of power signals, and in the independent filtering process of each group of interference signals, independent identification processing can be carried out according to the interference signals needing to be filtered of each group, so that when the corresponding signal frequency band changes, the interference signals needing to be filtered can be accurately filtered, and the filtering pertinence of the multi-layer interference signals is improved.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic block diagram of a system of the present invention;
FIG. 2 is a schematic block diagram of a multi-layer acquisition module of the present invention;
fig. 3 is a schematic block diagram of a filtering unit of the present invention.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Referring to fig. 1-3, a multi-layer EMI filter includes a multi-layer acquisition module and a filtering control module.
Referring to fig. 2, the multi-layer acquisition module is configured to acquire multiple sets of power signals; the multi-layer acquisition module comprises a plurality of groups of independent acquisition units, the multi-layer acquisition module is configured with independent acquisition strategies, and the independent acquisition strategies comprise: each group of independent acquisition units is provided with a signal acquisition frequency band with a certain range, each group of independent acquisition units is controlled to acquire independent signals, and signals with different frequency bands can be acquired through multi-layer acquisition.
The filtering control module comprises a filtering unit and a corresponding connection unit, wherein the filtering unit is used for filtering interference signals of multiple groups of power signals, the corresponding connection unit is used for conducting independent circuit connection on the multiple groups of power signals, and accuracy and rapidness of the circuit connection can be improved through the arrangement of the corresponding connection unit.
Referring to fig. 3, the filtering unit includes a plurality of low-pass filtering sub-units, a plurality of high-pass filtering sub-units, a plurality of band-stop filtering sub-units, and a plurality of all-pass filtering sub-units.
The low-pass filtering subunit is used for filtering high-frequency signals; the low-pass filtering subunit is configured with a low-pass filtering strategy, and the low-pass filtering strategy comprises: and obtaining a low-pass filtering frequency band according to a low-pass filtering formula, and filtering signals in the corresponding low-pass filtering frequency band. The low pass filtering formula is configured as follows:the method comprises the steps of carrying out a first treatment on the surface of the Pdtl is the low-pass filtered band, and Pdsd is the low-pass obtainedAnd taking a value Pdc as a low-pass reference value, and k1 as a low-pass conversion coefficient, wherein the low-pass acquisition value is acquired through a multi-layer acquisition module, and the value of k1 is larger than zero.
The high-pass filtering subunit is used for filtering low-frequency signals; the high-pass filtering subunit is configured with a high-pass filtering strategy, and the high-pass filtering strategy comprises: and obtaining a high-pass filtering frequency band according to a high-pass filtering formula, and filtering signals in the corresponding high-pass filtering frequency band. The high-pass filtering formula is configured to:the method comprises the steps of carrying out a first treatment on the surface of the Pgtl is a high-pass filtering frequency band, pgsd is a high-pass acquired value, pgc is a high-pass reference value, and k2 is a high-pass conversion coefficient, wherein the high-pass acquired value is acquired through a multi-layer acquisition module, and the value of k2 is larger than zero.
The band-pass filtering subunit is used for filtering signals lower than or higher than a set frequency band; the band-pass filtering subunit is configured with a band-pass filtering strategy, and the band-pass filtering strategy comprises: and obtaining a bandpass set frequency band according to a bandpass filtering formula, and filtering a signal frequency band which is larger or smaller than a first bandpass threshold of the bandpass set frequency band. The band-pass filtering formula is configured as follows:the method comprises the steps of carrying out a first treatment on the surface of the Pdts is a band-pass set frequency band, pdtc is a band-pass reference value, and k3 is a band-pass conversion coefficient, wherein the set frequency band is driven to be acquired through a multi-layer acquisition module, and the value of k3 is larger than zero.
The band-reject filter subunit is used for filtering signals in a set frequency band; the bandstop filtering subunit is configured with a bandstop filtering strategy, and the bandstop filtering strategy comprises: and obtaining a band-stop filtering frequency band according to a band-stop filtering formula, adding and subtracting a first band-stop filtering threshold value according to the band-stop filtering frequency band to obtain a band-stop filtering range, and filtering a signal frequency band in the band-stop filtering range. The band-reject filter formula is configured to:the method comprises the steps of carrying out a first treatment on the surface of the Pdzs is the band reject band, pdzc is the band reject reference, and k4 is the band reject conversion factor. Wherein the method comprises the steps ofThe band-stop reference value is obtained through a multi-layer acquisition module, and the value of k4 is larger than zero.
The all-pass filtering subunit is used for carrying out delay output on signals of the set frequency band; the all-pass filtering subunit is configured with an all-pass filtering strategy, and the all-pass filtering strategy comprises: and obtaining the all-pass delay time according to an all-pass filtering formula, and outputting signals of the set frequency band according to the all-pass delay time. The all-pass filtering formula is configured as follows:the method comprises the steps of carrying out a first treatment on the surface of the Tys is the all-pass delay time, pqtc is the all-pass reference value, and T1 is the all-pass delay conversion coefficient. Wherein the all-pass reference value is obtained through a multi-layer acquisition module, and the value of T1 is larger than zero.
The corresponding connection unit is configured with a corresponding connection policy, the corresponding connection policy comprising: numbering signals passing through a plurality of groups of low-pass filtering subunits, and sequentially setting the signals as Xd1 to Xda, wherein Xd1 is the signal number passing through a first group of low-pass filtering subunits, xda is the signal number passing through an a-th group of low-pass filtering subunits, a represents the number of the low-pass filtering subunits, and the signals passing through the numbered low-pass filtering subunits are respectively connected with corresponding circuits; through setting up different serial numbers, can be convenient for the signal after the low pass filtering to carry out corresponding connection.
Numbering signals passing through a plurality of groups of high-pass filtering subunits, and sequentially setting the signals as Xg1 to Xgb, wherein Xg1 is the signal number passing through a first group of high-pass filtering subunits, xgb is the signal number passing through a b group of high-pass filtering subunits, b represents the number of the high-pass filtering subunits, and the signals passing through the numbered high-pass filtering subunits are respectively connected with corresponding circuits; different numbers are set, so that signals subjected to high-pass filtering can be connected correspondingly.
Numbering signals passing through a plurality of groups of band-pass filtering subunits, and sequentially setting the signals as Xdt to Xdtc, wherein Xdt is the number of the signals passing through the first group of band-pass filtering subunits, xdtc is the number of the signals passing through the c-th group of band-pass filtering subunits, c represents the number of the band-pass filtering subunits, and the signals passing through the numbered band-pass filtering subunits are respectively connected with corresponding circuits; different numbers are arranged, so that signals subjected to band-pass filtering can be connected correspondingly.
Numbering signals passing through a plurality of groups of band-stop filtering subunits, and sequentially setting the signals as Xdz to Xdzd, wherein Xdz is the signal number passing through a first group of low-band-stop filtering subunits, xdzd is the signal number passing through a d group of band-stop filtering subunits, d represents the number of low-pass filtering subunits, and the signals passing through the numbered low-pass filtering subunits are respectively connected with corresponding circuits; different numbers are arranged, so that signals subjected to band elimination filtering can be connected correspondingly.
And numbering signals passing through a plurality of groups of all-pass filtering subunits, and sequentially setting the signals as Xq1 to Xqe, wherein Xq1 is the signal number passing through a first group of all-pass filtering subunits, xqe is the signal number passing through an e-th group of all-pass filtering subunits, e represents the number of all-pass filtering subunits, and the signals passing through the numbered all-pass filtering subunits are respectively connected with corresponding circuits. Different numbers are arranged, so that signals subjected to band elimination filtering can be connected correspondingly.
The filtering control system of the multilayer EMI filter comprises a filtering unit and a corresponding connection unit, wherein the filtering unit is used for filtering interference signals of a plurality of groups of power supply signals; the filtering unit comprises a plurality of groups of low-pass filtering subunits, a plurality of groups of high-pass filtering subunits, a plurality of groups of band-stop filtering subunits and a plurality of groups of all-pass filtering subunits, wherein the low-pass filtering subunits are used for filtering high-frequency signals; low-pass filtering allows low-frequency or direct-current components in the signal to pass through, and suppresses high-frequency components or interference and noise; the high-pass filtering subunit is used for filtering low-frequency signals; the band-pass filtering subunit is used for filtering signals lower than or higher than a set frequency band; the band-pass filtering sub-unit is used for filtering signals in a set frequency band; the band reject filter suppresses signals within a certain frequency band and allows signals outside the frequency band to pass. The all-pass filtering subunit is used for carrying out delay output on signals of the set frequency band. All-pass filtering means that the amplitude of the signal does not change in the full frequency band range, i.e. the amplitude gain is constantly equal to 1 in the full frequency band. The phase shift, i.e. the change in phase of the input signal, is typically proportional to the frequency, which corresponds to a time delay system. The corresponding connection units are used for performing independent circuit connection on the multiple groups of power supply signals.
Working principle: in the specific operation process, the multi-group power supply signals can be collected simultaneously through the multi-layer collection module, the multi-group power supply signals can be filtered through the filtering unit, the multi-group power supply signals can be independently connected through the corresponding connection unit, in-process of independent filtering is conducted on each group of interference signals, independent identification processing can be conducted according to the interference signals needing to be filtered, and therefore when the corresponding signal frequency band changes, the interference signals needing to be filtered can be accurately filtered.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. The multilayer EMI filter is characterized by comprising a multilayer acquisition module and a filtering control module, wherein the multilayer acquisition module is used for acquiring a plurality of groups of power supply signals; the multi-layer acquisition module comprises a plurality of groups of independent acquisition units, the multi-layer acquisition module is configured with independent acquisition strategies, and the independent acquisition strategies comprise: setting a signal acquisition frequency band with a certain range for each group of independent acquisition units, and controlling each group of independent acquisition units to acquire independent signals;
the filtering control module comprises a filtering unit and a corresponding connection unit, wherein the filtering unit is used for filtering interference signals of a plurality of groups of power signals and comprises a plurality of groups of low-pass filtering subunits, a plurality of groups of high-pass filtering subunits, a plurality of groups of band-stop filtering subunits and a plurality of groups of all-pass filtering subunits, and the low-pass filtering subunits are used for filtering high-frequency signals; the high-pass filtering subunit is used for filtering low-frequency signals; the band-pass filtering subunit is used for filtering signals lower than or higher than a set frequency band; the band-reject filter subunit is used for filtering signals in a set frequency band; the all-pass filtering subunit is used for carrying out delay output on signals of the set frequency band; the low-pass filtering subunit is configured with a low-pass filtering strategy, and the low-pass filtering strategy comprises: obtaining a low-pass filtering frequency band according to a low-pass filtering formula, and filtering signals in the corresponding low-pass filtering frequency band; the high-pass filtering subunit is configured with a high-pass filtering strategy, and the high-pass filtering strategy comprises: obtaining a high-pass filtering frequency band according to a high-pass filtering formula, and filtering signals in the corresponding high-pass filtering frequency band; the band-pass filtering subunit is configured with a band-pass filtering strategy, and the band-pass filtering strategy comprises: obtaining a bandpass set frequency band according to a bandpass filtering formula, and filtering a signal frequency band which is larger than or smaller than a first bandpass threshold of the bandpass set frequency band; the bandstop filtering subunit is configured with a bandstop filtering strategy, and the bandstop filtering strategy comprises: obtaining a band-stop filtering frequency band according to a band-stop filtering formula, adding and subtracting a first band-stop filtering threshold value according to the band-stop filtering frequency band to obtain a band-stop filtering range, and filtering a signal frequency band in the band-stop filtering range; the all-pass filtering subunit is configured with an all-pass filtering strategy, and the all-pass filtering strategy comprises: obtaining an all-pass delay time according to an all-pass filtering formula, and outputting a signal of a set frequency band according to the all-pass delay time;
the corresponding connection units are used for performing independent circuit connection on a plurality of groups of power supply signals; the corresponding connection unit is configured with a corresponding connection policy, the corresponding connection policy comprising: numbering signals passing through a plurality of groups of low-pass filtering subunits, and sequentially setting the signals as Xd1 to Xda, wherein Xd1 is the signal number passing through a first group of low-pass filtering subunits, xda is the signal number passing through an a-th group of low-pass filtering subunits, a represents the number of the low-pass filtering subunits, and the signals passing through the numbered low-pass filtering subunits are respectively connected with corresponding circuits; numbering signals passing through a plurality of groups of high-pass filtering subunits, and sequentially setting the signals as Xg1 to Xgb, wherein Xg1 is the signal number passing through a first group of high-pass filtering subunits, xgb is the signal number passing through a b group of high-pass filtering subunits, b represents the number of the high-pass filtering subunits, and the signals passing through the numbered high-pass filtering subunits are respectively connected with corresponding circuits;
numbering signals passing through a plurality of groups of band-pass filtering subunits, and sequentially setting the signals as Xdt to Xdtc, wherein Xdt is the number of the signals passing through the first group of band-pass filtering subunits, xdtc is the number of the signals passing through the c-th group of band-pass filtering subunits, c represents the number of the band-pass filtering subunits, and the signals passing through the numbered band-pass filtering subunits are respectively connected with corresponding circuits;
numbering signals passing through a plurality of groups of band-stop filtering subunits, and sequentially setting the signals as Xdz to Xdzd, wherein Xdz is the number of the signals passing through the band-stop filtering subunits of the first group, xdzd is the number of the signals passing through the band-stop filtering subunits of the d group, d represents the number of the band-stop filtering subunits, and the signals passing through the band-stop filtering subunits after numbering are respectively connected with corresponding circuits;
and numbering signals passing through a plurality of groups of all-pass filtering subunits, and sequentially setting the signals as Xq1 to Xqe, wherein Xq1 is the signal number passing through a first group of all-pass filtering subunits, xqe is the signal number passing through an e-th group of all-pass filtering subunits, e represents the number of all-pass filtering subunits, and the signals passing through the numbered all-pass filtering subunits are respectively connected with corresponding circuits.
2. The multilayer EMI filter of claim 1, wherein the low-pass filtering formula is configured to: pdtl= (Pdsd-Pdc) k1; the high-pass filtering formula is configured to: pgtl= (Pgsd-Pgc) k2; the band-pass filtering formula is configured as follows: pdts=pdtc×k3; the band-reject filter formula is configured to: pdzs=pdzc×k4; the all-pass filtering formula is configured as follows: tys =pqtc T1; wherein Pdtl is a low-pass filtered frequency band, pdsd is a low-pass acquired value, pdc is a low-pass reference value, k1 is a low-pass conversion coefficient, pgtl is a high-pass filtered frequency band, pgsd is a high-pass acquired value, pgc is a high-pass reference value, k2 is a high-pass conversion coefficient, pdts is a band-pass set frequency band, pdtc is a band-pass reference value, k3 is a band-pass conversion coefficient, pdzs is a band-stop filtered frequency band, pdzc is a band-stop reference value, k4 is a band-stop conversion coefficient, tys is an all-pass delay time, pqtc is an all-pass reference value, and T1 is an all-pass delay conversion coefficient.
3. A filter control system comprising a multilayer EMI filter as set forth in any one of claims 1-2.
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