CN104917477A - Filter - Google Patents
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- CN104917477A CN104917477A CN201510296150.6A CN201510296150A CN104917477A CN 104917477 A CN104917477 A CN 104917477A CN 201510296150 A CN201510296150 A CN 201510296150A CN 104917477 A CN104917477 A CN 104917477A
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Abstract
The invention discloses a filter and relates to the electronic information field. When an EMC filter in the prior art performs filtering, the EMC filter can only filter electromagnetic waves in a narrow frequency range because the bandwidth of the EMC filter is small, and as a result, the problem of low work efficiency can be brought about, while, with the filter of the invention adopted, the above problem can be solved. The filter comprises at least one filtering module; when the number of the at least one filtering module is larger than or equal to 2, the filtering modules are connected in series with each other; the filtering module comprise a first filtering unit and a second filtering unit; the first filtering unit and the second filtering unit are connected in series; the resonant frequency of the first filtering unit is first resonant frequency; the resonant frequency of the second filtering unit is second resonant frequency; and the first resonant frequency is not equal to the second resonant frequency. The filter of the invention is used for filtering.
Description
Technical field
The present invention relates to electronic information field, particularly relate to a kind of filter.
Background technology
The filter circuit that filter is made up of electric capacity, inductance and resistance.Filter can carry out effective filtering to the frequency beyond the frequency of characteristic frequency in power line or this frequency, obtains the power supply signal of a characteristic frequency, or eliminates the power supply signal after a characteristic frequency.
But, filter in the course of the work, inevitably produces electromagnetic interference, for reducing the electromagnetic interference that filter produces, EMC (English full name: ElectromagneticCompatibility, Chinese full name: Electro Magnetic Compatibility) filter arises at the historic moment.EMC refers to that equipment or system meet the requirements in its electromagnetic environment and runs and any equipment in its environment do not produced to the ability of intolerable electromagnetic disturbance.The noise that EMC filter is applicable to suppress electric network noise and higher harmonics and Switching Power Supply to produce and high-frequency harmonic.
But EMC filter is when carrying out filtering, and its bandwidth is narrower, can only filter the electromagnetic wave of narrow frequency separation, operating efficiency is lower.
Summary of the invention
Embodiments of the invention provide a kind of filter, can solve in prior art that EMC filter is when carrying out filtering, and its bandwidth is narrower, can only filter, the problem that operating efficiency is lower to the electromagnetic wave of narrow frequency separation.
For achieving the above object, embodiments of the invention adopt following technical scheme:
First aspect, the embodiment of the present invention provides a kind of filter, comprise: at least one filtration module, when the number of at least one filtration module described is more than or equal to 2, connect between at least one filtration module described, described filtration module comprises the first filter unit and the second filter unit, described first filter unit and described second filter unit series connection;
Wherein, the resonance frequency of described first filter unit is the first resonance frequency, when the power frequency in described filter is less than described first resonance frequency, the impedance operator of described first filter unit is perception, when the power frequency in described first filter is greater than described first resonance frequency, the impedance operator of described first filter unit is capacitive;
The resonance frequency of described second filter unit is the second resonance frequency, when the power frequency in described filter is less than described second resonance frequency, the impedance operator of described second filter unit is perception, when the power frequency in described second filter is greater than described second resonance frequency, the impedance operator of described second filter unit is capacitive;
Described first resonance frequency and described second resonance frequency unequal.
The filter that the embodiment of the present invention provides, comprises at least one filtration module, and filtration module comprises the first filter unit and the second filter unit, the first filter unit and the series connection of the second filter unit.Because two filter units have two different resonance frequencys, first resonance frequency and the second resonance frequency, the bandwidth of filtration module is added, the frequency separation that ripple suppresses can be added, enhancing the operating efficiency of filter, solving in prior art that EMC filter is when carrying out filtering, its bandwidth is narrower, can only filter the electromagnetic wave of narrow frequency separation, the problem that operating efficiency is lower.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of filter construction schematic diagram that Fig. 1 provides for the embodiment of the present invention;
A kind of filter equivalent circuit structure schematic diagram that Fig. 2 provides for the embodiment of the present invention;
A kind of filter impedance characteristic schematic diagram that Fig. 3 provides for the embodiment of the present invention;
A kind of disturbing wave amplitude size test design sketch that Fig. 4 provides for the embodiment of the present invention;
A kind of filtering modular structure schematic diagram that Fig. 5 provides for the embodiment of the present invention;
A kind of coil winding mode effect schematic diagram that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of filter, preferably, this filter can be EMC filter, with reference to shown in Fig. 1, this filter 10 comprises at least one filtration module 101, when the number of at least one filtration module is more than or equal to 2, mutually connects between at least one filtration module, filtration module 101 comprises the first filter unit 1011 and the second filter unit 1012, first filter unit 1011 and the second filter unit 1012 and connects.Certainly, two filtration modules have been shown in Fig. 1, have just illustrated, do not represented the present invention and be confined to this.
Wherein, the resonance frequency of the first filter unit is the first resonance frequency, when the power frequency in filter is less than the first resonance frequency, the impedance operator of the first filter unit is perception, when the power frequency in the first filter is greater than the first resonance frequency, the impedance operator of the first filter unit is capacitive.
The resonance frequency of the second filter unit is the second resonance frequency, when the power frequency in filter is less than the second resonance frequency, the impedance operator of the second filter unit is perception, and when the power frequency in the second filter is greater than the second resonance frequency, the impedance operator of the second filter unit is capacitive.
First resonance frequency and the second resonance frequency unequal.
Optionally, in filtration module 101, the equivalent circuit diagram of the first filter unit 1011 and the second filter unit 1012 as shown in Figure 2, comprise resistance 201, electric capacity 202 and inductance 203, first filter unit 1011 and the second filter unit 1012 all can present emotional resistance when power frequency is less than own resonance frequency, present capacitive reactances when power frequency is greater than own resonance frequency.
Herein, be less than the second resonance frequency be described for the first resonance frequency, with reference to shown in Fig. 3, Fig. 3 shows the impedance characteristic of the first filter unit 1011 and the second filter unit 1012.First resonance frequency is f
1, the second resonance frequency is f
2, for filtration module 101, be less than f at power frequency
1time, filtration module 101 presents the impedance operator of the first filter unit 1011, presents perception, along with the increase impedance of power frequency increases; When power frequency is greater than f
1time, filtration module 101 presents the impedance operator of the first filter unit 1011, presents capacitive, and its impedance reduces along with the increase of power frequency; When the frequency f corresponding to the intersection point that power frequency arrives two impedance characteristics
3time, filtration module 101 presents the impedance operator of the second filter unit 1012, become perception, and its impedance increases along with the increase of power frequency; When power frequency is greater than f
2time, filtration module 101 presents the impedance operator of the second filter unit 1012, becomes capacitive, and its impedance reduces along with the increase of power frequency.Like this, compared to prior art, filter only has single resonance frequency, its bandwidth is comparatively limited to, and the present invention's two filter units have different resonance frequencys, the bandwidth of filtration module 101 is added, the frequency separation that ripple suppresses can be added, enhance the operating efficiency of filter.
With reference to shown in Fig. 4, the filter 10 that Fig. 4 shows the embodiment of the present invention to be provided tests Contrast on effect schematic diagram with the filter disturbing wave amplitude size that prior art provides, transverse axis is power frequency, the longitudinal axis is disturbing wave amplitude size, can find out by Fig. 5, in the process that the filter 10 that the embodiment of the present invention provides increases gradually at power frequency, have lasting inhibitory action for disturbing wave, and in prior art after power frequency is more than 2MHz the inhibitory action of disturbing wave just very little.
Optionally, with reference to shown in Fig. 5, the first filter unit 1011 comprises the first coil 10111, second filter unit 1012, and to comprise the second coil 10121, second coil 10121 be enamelled wire, and the first coil 10111 is wrapped in the second coil 10121 skin.Preferably, filtration module 101 also comprises magnetic core 1013, and the second coil 10121 is wrapped on magnetic core 1013.Optionally, the first coil 10121 can be flat wire.
Further alternative, the first resonance frequency is less than the second resonance frequency, and the number of turn of the first coil is greater than the number of turn of the second coil.
Further alternative, as shown in Figure 6, the first coil according to by magnetic core first end to magnetic core second end clockwise direction be wound around.Second coil is counterclockwise wound around to the first end of magnetic core according to the second end by magnetic core.
Because the first coil and the second coil one are at skin, one is wrapped on same magnetic core at internal layer, saves the space of PCB (English full name: Printed Circuit Board, Chinese full name: printed circuit board) plate to a certain extent.And in the first coil and the second coil, the magnetic field that operating current produces and the magnetic field that disturbance current produces cancel each other, magnetic core can not be saturated, and the cross section of the second coil is little, around the number of turn few, inductance value is less, can the interference of filtering high frequency, the first coil section is large, around the number of turn many, inductance value is larger, can the interference of filtering low frequency, both combinations increase with regard to making the filtering bandwidth of filter, improve filtration efficiency.
The filter that the embodiment of the present invention provides, comprises at least one filtration module, and filtration module comprises the first filter unit and the second filter unit, the first filter unit and the series connection of the second filter unit.Because two filter units have two different resonance frequencys, first resonance frequency and the second resonance frequency, the bandwidth of filtration module is added, the frequency separation that ripple suppresses can be added, enhancing the operating efficiency of filter, solving in prior art that EMC filter is when carrying out filtering, its bandwidth is narrower, can only filter the electromagnetic wave of narrow frequency separation, the problem that operating efficiency is lower.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a filter, it is characterized in that, comprise: at least one filtration module, when the number of at least one filtration module described is more than or equal to 2, connect between at least one filtration module described, described filtration module comprises the first filter unit and the second filter unit, described first filter unit and described second filter unit series connection;
Wherein, the resonance frequency of described first filter unit is the first resonance frequency, when the power frequency in described filter is less than described first resonance frequency, the impedance operator of described first filter unit is perception, when the power frequency in described first filter is greater than described first resonance frequency, the impedance operator of described first filter unit is capacitive;
The resonance frequency of described second filter unit is the second resonance frequency, when the power frequency in described filter is less than described second resonance frequency, the impedance operator of described second filter unit is perception, when the power frequency in described second filter is greater than described second resonance frequency, the impedance operator of described second filter unit is capacitive;
Described first resonance frequency and described second resonance frequency unequal.
2. filter according to claim 1, is characterized in that,
Described first filter unit comprises the first coil, and described second filter unit comprises the second coil, and described second coil is enamelled wire, and it is outer that described first coil is wrapped in described second coil.
3. filter according to claim 2, is characterized in that,
Described first resonance frequency is less than described second resonance frequency, and the number of turn of described first coil is greater than the number of turn of described second coil.
4. filter according to claim 2, is characterized in that, described filtration module also comprises magnetic core, and described first coil is wrapped on described magnetic core;
Described first coil according to by described magnetic core first end to described magnetic core second end clockwise direction be wound around;
Described second coil is counterclockwise wound around to the first end of described magnetic core according to the second end by described magnetic core.
5. filter according to claim 2, is characterized in that,
Described filtration module also comprises magnetic core, and described second coil winding is on described magnetic core.
6. the filter according to any one of claim 1-5, is characterized in that,
Described filter is Electro Magnetic Compatibility EMC filter.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810751771.2A CN108923764A (en) | 2015-06-02 | 2015-06-02 | A kind of filter |
| CN201510296150.6A CN104917477A (en) | 2015-06-02 | 2015-06-02 | Filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510296150.6A CN104917477A (en) | 2015-06-02 | 2015-06-02 | Filter |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810751771.2A Division CN108923764A (en) | 2015-06-02 | 2015-06-02 | A kind of filter |
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| CN104917477A true CN104917477A (en) | 2015-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810751771.2A Pending CN108923764A (en) | 2015-06-02 | 2015-06-02 | A kind of filter |
| CN201510296150.6A Pending CN104917477A (en) | 2015-06-02 | 2015-06-02 | Filter |
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| CN201810751771.2A Pending CN108923764A (en) | 2015-06-02 | 2015-06-02 | A kind of filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107359866A (en) * | 2017-07-11 | 2017-11-17 | 西安交通大学 | A kind of integral type low-pass filtering module |
| CN107395153A (en) * | 2017-07-11 | 2017-11-24 | 西安交通大学 | A kind of self-shielding type low-pass filtering module |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113225037B (en) * | 2021-03-26 | 2024-03-29 | 洛坦电子科技(上海)有限公司 | Filter for silicon carbide high-frequency controller |
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| US20060132257A1 (en) * | 2004-12-17 | 2006-06-22 | Shuo Wang | EMI filter and frequency filters having capacitor with inductance cancellation loop |
| CN101661827A (en) * | 2008-08-29 | 2010-03-03 | 艾默生网络能源系统北美公司 | EMC inductor and manufacturing method thereof, EMI filter and switching power supply |
| CN101202496B (en) * | 2006-10-06 | 2011-12-14 | 施耐德东芝换流器欧洲公司 | Common-mode filtering device and speed variator comprising such a device |
| CN103543310A (en) * | 2012-07-10 | 2014-01-29 | 北京普源精电科技有限公司 | Oscillograph with frequency response compensation circuit |
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| JPS6258608A (en) * | 1985-09-06 | 1987-03-14 | Murata Mfg Co Ltd | Inductor for removal of noise |
| JP3231837B2 (en) * | 1992-05-21 | 2001-11-26 | 東京電力株式会社 | Superconducting current limiting device |
| CN201112037Y (en) * | 2007-09-10 | 2008-09-10 | 李正雄 | Electric-sensing structure used in wide frequency |
| JP6024418B2 (en) * | 2012-11-28 | 2016-11-16 | Tdk株式会社 | Common mode filter |
| KR101468821B1 (en) * | 2012-12-19 | 2014-12-03 | 티디케이가부시기가이샤 | Common mode filter |
| US9276547B2 (en) * | 2013-06-28 | 2016-03-01 | Peregrine Semiconductor Corporation | Systems and methods of stacking LC tanks for wide tuning range and high voltage swing |
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- 2015-06-02 CN CN201510296150.6A patent/CN104917477A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060132257A1 (en) * | 2004-12-17 | 2006-06-22 | Shuo Wang | EMI filter and frequency filters having capacitor with inductance cancellation loop |
| CN101202496B (en) * | 2006-10-06 | 2011-12-14 | 施耐德东芝换流器欧洲公司 | Common-mode filtering device and speed variator comprising such a device |
| CN101661827A (en) * | 2008-08-29 | 2010-03-03 | 艾默生网络能源系统北美公司 | EMC inductor and manufacturing method thereof, EMI filter and switching power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107359866A (en) * | 2017-07-11 | 2017-11-17 | 西安交通大学 | A kind of integral type low-pass filtering module |
| CN107395153A (en) * | 2017-07-11 | 2017-11-24 | 西安交通大学 | A kind of self-shielding type low-pass filtering module |
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| Publication number | Publication date |
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| CN108923764A (en) | 2018-11-30 |
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