CN114584091A - Multilayer EMI filter and filtering control system thereof - Google Patents
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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 multiple 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 multiple groups of power signals, the corresponding connection unit is used for carrying out independent circuit connection on the multiple groups of power signals, the multilayer acquisition module comprises a plurality of groups of independent acquisition units, the multilayer acquisition module is configured with an independent acquisition strategy, and the independent acquisition strategy comprises: the invention can improve the filtering accuracy of multilayer interference signals so as to solve the problem of lower filtering pertinence and accuracy 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 (EMI) is an interpretation of Electromagnetic Interference. The interference phenomenon generated after the electromagnetic wave and the electronic component act is conducted interference and radiation interference. Conducted interference refers to coupling (interfering) of a signal on one electrical network to another electrical network through a conductive medium. The filter is a filter circuit consisting of a capacitor, an inductor and a resistor. The filter can effectively filter the frequency point of the specific frequency in the power line or the frequencies except the frequency point to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency.
In the prior art, the existing filter is low in applicability to the filtering of each group of signals in the process of filtering out a plurality of groups of signals, when the signals change, the existing filtering control system is difficult to deal with the change of the signals, so that the original normal signals which pass through the existing filtering control system can be filtered out possibly, and the equipment cannot operate normally.
Disclosure of Invention
Aiming at the defects in 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 problem that the existing filter is low in filtering pertinence and accuracy.
In order to realize the purpose, the invention is realized by the following technical scheme: a multilayer EMI filter comprises a multilayer acquisition module and a filtering control module, wherein the multilayer acquisition module is used for acquiring multiple groups of power signals;
the filtering control module comprises a filtering unit and a corresponding connecting unit, the filtering unit is used for filtering interference signals of multiple groups of power signals, and the corresponding connecting unit is used for carrying out independent circuit connection on the multiple groups of power signals.
Further, the multilayer collection module includes a plurality of groups of independent collection units, the multilayer collection module is configured with an independent collection strategy, the independent collection strategy includes: and setting a signal acquisition frequency band in a certain range for each group of independent acquisition units, and controlling each group of independent acquisition units to acquire independent signals.
Furthermore, 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, 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 elimination filtering subunit is used for filtering signals in a set frequency band; the all-pass filtering subunit is used for delaying and outputting the signal of the set frequency band.
Further, the low-pass filtering subunit is configured with a low-pass filtering strategy, and 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, which includes: 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 band pass setting frequency band according to a band pass filtering formula, and filtering a signal frequency band which is greater than or less than a first band pass threshold value of the band pass setting frequency band;
the band elimination filtering subunit is configured with a band elimination filtering strategy, and the band elimination filtering strategy comprises: obtaining a band elimination filtering frequency band according to a band elimination filtering formula, adding and subtracting a first band elimination filtering threshold value according to the band elimination filtering frequency band to obtain a band elimination filtering range, and filtering a signal frequency band in the band elimination 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 the signal of the set frequency band according to the all-pass delay time.
Further, the low-pass filtering formula is configured to:
(ii) a The high-pass filteringThe division formula is configured as:
(ii) a The band-pass filtering formula is configured as:
(ii) a The band-stop filtering formula is configured as:
(ii) a The all-pass filtering formula is configured as:
(ii) a Pdtl is a low-pass filtering frequency band, Pdsd is a low-pass obtaining value, Pdc is a low-pass reference value, k1 is a low-pass conversion coefficient, Pgtl is a high-pass filtering frequency band, Pgsd is a high-pass obtaining value, Pgc is a high-pass reference value, k2 is a high-pass conversion coefficient, Pdts is a band-pass setting frequency band, pdcc is a band-pass reference value, k3 is a band-pass conversion coefficient, Pdzs is a band-stop filtering frequency band, pdcc is a band-stop reference value, k4 is a band-stop conversion coefficient, Tys is an all-pass delay duration, Pqtc is an all-pass reference value, and T1 is an all-pass delay conversion coefficient.
Further, the corresponding connection unit is configured with a corresponding connection policy, where the corresponding connection policy includes: numbering the signals passed by the groups of low-pass filtering subunits, and sequentially setting the signals to Xd 1-Xda, wherein Xd1 is the signal number passed by the first group of low-pass filtering subunits, Xda is the signal number passed by the a-th group of low-pass filtering subunits, a represents the number of the low-pass filtering subunits, and the signals passed by the numbered low-pass filtering subunits are respectively connected with corresponding circuits;
numbering signals passed by a plurality of groups of high-pass filtering subunits, sequentially setting the signals to Xg 1-Xgb, wherein Xg1 is the number of the signals passed by the first group of high-pass filtering subunits, Xgb is the number of the signals passed by the b-th group of high-pass filtering subunits, b represents the number of the high-pass filtering subunits, and the signals passed by 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, sequentially setting the signals to be Xdt 1-Xdtc, wherein Xdt1 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 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 the signals passed by the band elimination subunits, sequentially setting the signals to be Xdz 1-Xdzd, wherein Xdz1 is the number of the signals passed by the first group of low band elimination subunits, Xdzd is the number of the signals passed by the d group of band elimination subunits, d represents the number of the low-pass filtration subunits, and the signals passed by the low-pass filtration subunits after numbering are respectively connected with corresponding circuits;
the signals passed by the groups of all-pass filtering subunits are numbered and are sequentially set to be Xq 1-Xqe, wherein Xq1 is the signal number passed by the first group of all-pass filtering subunits, Xqe is the signal number passed by the e-th group of all-pass filtering subunits, e represents the number of all-pass filtering subunits, and the signals passed by the numbered all-pass filtering subunits are respectively connected with corresponding circuits.
A filtering control system of a 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 signals;
the corresponding connection unit is used for carrying out independent circuit connection on a plurality of groups of power supply signals.
Furthermore, 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, 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 elimination filtering subunit is used for filtering signals in a set frequency band; the all-pass filtering subunit is used for delaying and outputting the signal of the set frequency band.
The invention has the beneficial effects that: the filter comprises a multilayer acquisition module and a filtering control module, wherein the multilayer acquisition module can acquire a plurality of groups of power signals, the filtering control module comprises a filtering unit and a corresponding connecting unit, the filtering unit can filter interference signals of the plurality of groups of power signals, the corresponding connecting unit can carry out independent circuit connection on the plurality of groups of power signals, and in the process of independently filtering each group of interference signals, the interference signals to be filtered can be independently identified and processed according to each group of interference signals, so that when the corresponding signal frequency band changes, the interference signals to be filtered can be accurately filtered, and the filtering pertinence of the multilayer interference signals is improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic block diagram of the system of the present invention;
FIG. 2 is a functional 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
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Referring to fig. 1-3, a multi-layer EMI filter includes a multi-layer acquisition module and a filter control module.
Referring to fig. 2, the multilayer acquisition module is configured to acquire a plurality of groups of power signals; the multilayer collection module includes a plurality of groups of independent collection units, the multilayer collection module is configured with an independent collection strategy, the independent collection strategy includes: the signal acquisition frequency band of a certain range is set for each group of independent acquisition units, each group of independent acquisition units is controlled to acquire independent signals, and signals of different frequency bands can be acquired through multilayer acquisition.
The filtering control module comprises a filtering unit and a corresponding connecting unit, the filtering unit is used for filtering interference signals of multiple groups of power signals, the corresponding connecting unit is used for carrying out independent circuit connection on the multiple groups of power signals, and the corresponding connecting unit is arranged, so that the accuracy and the rapidness of the circuit connection can be improved.
Referring to fig. 3, the filtering unit includes a plurality of sets of low-pass filtering subunits, a plurality of sets of high-pass filtering subunits, a plurality of sets of band-stop filtering subunits, and a plurality of sets of all-pass filtering subunits.
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, which includes: 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 to:
(ii) a Pdtl is a low-pass filtering frequency band, Pdsd is a low-pass acquisition value, Pdc is a low-pass reference value, k1 is a low-pass conversion coefficient, wherein the low-pass acquisition value is acquired by the multilayer acquisition module, and the value of k1 is greater 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 comprising: 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:
(ii) a Pgtl is a high-pass filtering frequency band, Pgsd is a high-pass acquisition value, Pgc is a high-pass reference value, k2 is a high-pass conversion coefficient, wherein the high-pass acquisition value is acquired through the multilayer 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: obtaining a band-pass set frequency band according to a band-pass filtering formula, wherein the filtering is greater than or less than a first band-pass set frequency bandSignal frequency band of band-pass threshold. The band-pass filtering formula is configured as:
(ii) a Pdts is a band-pass set frequency band, Pdtc is a band-pass reference value, k3 is a band-pass conversion coefficient, the set frequency band is driven to be acquired through the multilayer acquisition modules, and the value of k3 is larger than zero.
The band elimination filtering subunit is used for filtering signals in a set frequency band; the band elimination filtering subunit is configured with a band elimination filtering strategy, and the band elimination filtering strategy comprises: and calculating a band elimination filtering frequency band according to a band elimination filtering formula, adding and subtracting a first band elimination filtering threshold value according to the band elimination filtering frequency band to obtain a band elimination filtering range, and filtering a signal frequency band in the band elimination filtering range. The band-stop filtering formula is configured as:
(ii) a Pdzs is a band-stop filtering frequency band, Pdzc is a band-stop reference value, and k4 is a band-stop conversion coefficient. The band stop reference value is obtained through the multilayer acquisition module, and the value of k4 is larger than zero.
The all-pass filtering subunit is used for delaying and outputting the signal 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 the signal of the set frequency band according to the all-pass delay time. The all-pass filtering formula is configured as:
(ii) a Tys is the all-pass delay duration, Pqtc is the all-pass reference value, and T1 is the all-pass delay conversion coefficient. Wherein the all-pass reference value is obtained by a multilayer acquisition module, and the value of T1 is greater than zero.
The corresponding connection unit is configured with a corresponding connection policy, and the corresponding connection policy includes: numbering signals passed by a plurality of groups of low-pass filtering subunits, and sequentially setting the signals to be Xd 1-Xda, wherein Xd1 is the number of the signals passed by the first group of low-pass filtering subunits, Xda is the number of the signals passed by the a-th group of low-pass filtering subunits, a represents the number of the low-pass filtering subunits, and the signals passed by the numbered low-pass filtering subunits are respectively connected with corresponding circuits; through setting up different serial numbers, the signal after the low pass filtering of can being convenient for corresponds the connection.
Numbering signals passed by a plurality of groups of high-pass filtering subunits, sequentially setting the signals to Xg 1-Xgb, wherein Xg1 is the number of the signals passed by the first group of high-pass filtering subunits, Xgb is the number of the signals passed by the b-th group of high-pass filtering subunits, b represents the number of the high-pass filtering subunits, and the signals passed by the numbered high-pass filtering subunits are respectively connected with corresponding circuits; through setting up different serial numbers, the signal after the high pass filtering of being convenient for corresponds the connection.
Numbering signals passing through a plurality of groups of band-pass filtering subunits, sequentially setting the signals to be Xdt 1-Xdtc, wherein Xdt1 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 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; through setting up different serial numbers, the signal after the band-pass filtering of can being convenient for corresponds the connection.
Numbering the signals passed by the band elimination subunits, sequentially setting the signals to be Xdz 1-Xdzd, wherein Xdz1 is the number of the signals passed by the first group of low band elimination subunits, Xdzd is the number of the signals passed by the d group of band elimination subunits, d represents the number of the low-pass filtration subunits, and the signals passed by the low-pass filtration subunits after numbering are respectively connected with corresponding circuits; different numbers are set, so that signals after band elimination and filtering can be conveniently correspondingly connected.
The signals passed by the groups of all-pass filtering subunits are numbered and are sequentially set to be Xq 1-Xqe, wherein Xq1 is the signal number passed by the first group of all-pass filtering subunits, Xqe is the signal number passed by the e-th group of all-pass filtering subunits, e represents the number of all-pass filtering subunits, and the signals passed by the numbered all-pass filtering subunits are respectively connected with corresponding circuits. Different numbers are set, so that signals after band elimination and filtering can be conveniently correspondingly connected.
A filtering control system of a 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 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, and the low-pass filtering subunits are used for filtering high-frequency signals; the low-pass filtering allows low-frequency or direct-current components in the signals 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 high-pass filtering allows high-frequency components in the signals to pass through and inhibits low-frequency or direct-current components, and the band-pass filtering subunit is used for filtering signals lower than or higher than a set frequency band; the band-pass filtering allows signals in a certain frequency band to pass through, and inhibits signals, interference and noise lower than or higher than the frequency band, and the band-stop filtering subunit is used for filtering signals in a set frequency band; the band elimination filter suppresses signals in a certain frequency band and allows signals outside the frequency band to pass through. The all-pass filtering subunit is used for delaying and outputting the signal of the set frequency band. All-pass filtering means that the amplitude of the signal does not change in the full-band range, that is, the gain of the amplitude is constantly equal to 1 in the full-band. Generally, an all-pass filter is used to shift the phase, i.e. to change the phase of the input signal, ideally the phase shift is proportional to the frequency, corresponding to a time delay system. The corresponding connection unit is used for carrying out independent circuit connection on a plurality of groups of power supply signals.
The working principle is as follows: in the concrete operation process, can gather multiunit signal through multilayer collection module simultaneously, can carry out interfering signal's filtering to multiunit signal through the filtering unit, the rethread corresponds the coupling unit and can carry out independent circuit connection to multiunit signal, and carry out the in-process of independent filtering to every interfering signal of group, can carry out independent identification according to the interfering signal of every group needs filtering and handle, thereby when the signal frequency channel that corresponds appears changing, can be accurate carry out the filtering to the interfering signal of needs filtering.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
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 multiple groups of power signals;
the filtering control module comprises a filtering unit and a corresponding connecting unit, the filtering unit is used for filtering interference signals of multiple groups of power signals, and the corresponding connecting unit is used for carrying out independent circuit connection on the multiple groups of power signals.
2. The multilayer EMI filter according to claim 1, wherein said multilayer acquisition module comprises groups of independent acquisition units, said multilayer acquisition module being configured with independent acquisition strategies comprising: and setting a signal acquisition frequency band in a certain range for each group of independent acquisition units, and controlling each group of independent acquisition units to acquire independent signals.
3. The multilayer EMI filter according to claim 2, wherein said filtering units comprise a plurality of sets of low-pass filtering sub-units, a plurality of sets of high-pass filtering sub-units, a plurality of sets of band-stop filtering sub-units, and a plurality of sets of all-pass filtering sub-units, said low-pass filtering sub-units being configured to filter out 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 elimination filtering subunit is used for filtering signals in a set frequency band; the all-pass filtering subunit is used for delaying and outputting the signal of the set frequency band.
4. The multilayer EMI filter of claim 3, wherein said low-pass filtering sub-unit is configured with a low-pass filtering strategy comprising: 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, which includes: 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 band pass setting frequency band according to a band pass filtering formula, and filtering a signal frequency band which is greater than or less than a first band pass threshold value of the band pass setting frequency band;
the band elimination filtering subunit is configured with a band elimination filtering strategy, and the band elimination filtering strategy comprises: obtaining a band elimination filtering frequency band according to a band elimination filtering formula, adding and subtracting a first band elimination filtering threshold value according to the band elimination filtering frequency band to obtain a band elimination filtering range, and filtering a signal frequency band in the band elimination 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 the signal of the set frequency band according to the all-pass delay time.
5. The multilayer EMI filter and filter control system thereof of claim 4, wherein said low pass filtering formula is configured to:
(ii) a The high-pass filtering formula is configured to:
(ii) a The band-pass filtering formula is configured as:
(ii) a The band-stop filtering formula is configured as:
(ii) a The all-pass filtering formula is configured as:
(ii) a Pdtl is a low-pass filtering frequency band, Pdsd is a low-pass obtaining value, Pdc is a low-pass reference value, k1 is a low-pass conversion coefficient, Pgtl is a high-pass filtering frequency band, Pgsd is a high-pass obtaining value, Pgc is a high-pass reference value, k2 is a high-pass conversion coefficient, Pdts is a band-pass setting frequency band, pdcc is a band-pass reference value, k3 is a band-pass conversion coefficient, Pdzs is a band-stop filtering frequency band, pdcc is a band-stop reference value, k4 is a band-stop conversion coefficient, Tys is an all-pass delay duration, Pqtc is an all-pass reference value, and T1 is an all-pass delay conversion coefficient.
6. The multilayer EMI filter of claim 5, wherein said corresponding connection units are configured with corresponding connection strategies comprising: numbering the signals passed by the groups of low-pass filtering subunits, and sequentially setting the signals to Xd 1-Xda, wherein Xd1 is the signal number passed by the first group of low-pass filtering subunits, Xda is the signal number passed by the a-th group of low-pass filtering subunits, a represents the number of the low-pass filtering subunits, and the signals passed by the numbered low-pass filtering subunits are respectively connected with corresponding circuits;
numbering signals passed by a plurality of groups of high-pass filtering subunits, sequentially setting the signals to Xg 1-Xgb, wherein Xg1 is the number of the signals passed by the first group of high-pass filtering subunits, Xgb is the number of the signals passed by the b-th group of high-pass filtering subunits, b represents the number of the high-pass filtering subunits, and the signals passed by 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, sequentially setting the signals to be Xdt 1-Xdtc, wherein Xdt1 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 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 the signals passed by the band elimination subunits, sequentially setting the signals to be Xdz 1-Xdzd, wherein Xdz1 is the number of the signals passed by the first group of low band elimination subunits, Xdzd is the number of the signals passed by the d group of band elimination subunits, d represents the number of the low-pass filtration subunits, and the signals passed by the low-pass filtration subunits after numbering are respectively connected with corresponding circuits;
the signals passed by the groups of all-pass filtering subunits are numbered and are sequentially set to be Xq 1-Xqe, wherein Xq1 is the signal number passed by the first group of all-pass filtering subunits, Xqe is the signal number passed by the e-th group of all-pass filtering subunits, e represents the number of all-pass filtering subunits, and the signals passed by the numbered all-pass filtering subunits are respectively connected with corresponding circuits.
7. The filtering control system of the multilayer EMI filter according to any one of claims 1 to 6, wherein the filtering control system comprises a filtering unit and a corresponding connection unit, the filtering unit is used for filtering interference signals from multiple groups of power signals;
the corresponding connection unit is used for carrying out independent circuit connection on a plurality of groups of power supply signals.
8. The multi-layer EMI filter and its filtering control system of claim 7, wherein the filtering units comprise several sets of low-pass filtering subunits, several sets of high-pass filtering subunits, several sets of band-stop filtering subunits and several sets of all-pass filtering subunits, 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 elimination filtering subunit is used for filtering signals in a set frequency band; the all-pass filtering subunit is used for delaying and outputting the signal of the set frequency band.
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| WO2021249652A1 (en) * | 2020-06-12 | 2021-12-16 | Huawei Technologies Co., Ltd. | Receiver unit, device with receiver unit, and method for suppressing interference |
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| CN114584091B (en) | 2023-07-25 |
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