CN108923764A - A kind of filter - Google Patents
A kind of filter Download PDFInfo
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- CN108923764A CN108923764A CN201810751771.2A CN201810751771A CN108923764A CN 108923764 A CN108923764 A CN 108923764A CN 201810751771 A CN201810751771 A CN 201810751771A CN 108923764 A CN108923764 A CN 108923764A
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- filter
- resonance frequency
- filter unit
- coil
- frequency
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Abstract
The invention discloses a kind of filters, are related to electronic information field, are able to solve in the prior art that EMC filter is when being filtered, and narrower bandwidth can only be filtered the electromagnetic wave of narrow frequency separation, the lower problem of working efficiency.The filter includes at least one filter module, when the number of at least one filter module is greater than or equal to 2, it connects between at least one filter module, filter module includes the first filter unit and the second filter unit, first filter unit and the series connection of the second filter unit, the resonance frequency of first filter unit is the first resonance frequency, and the resonance frequency of the second filter unit is the second resonance frequency, and the first resonance frequency and the second resonance frequency are unequal.The present invention is for filtering.
Description
The application is a kind of Chinese invention patent application of on 06 02nd, 2015 entitled " filter " proposed
201510296150.6 divisional application.
Technical field
The present invention relates to electronic information field more particularly to a kind of filters.
Background technique
The filter circuit that filter is made of capacitor, inductance and resistance.Filter can be to specific frequency in power supply line
Frequency point or the frequency point other than frequency effectively filtered out, obtain the power supply signal of a specific frequency, or eliminate a spy
Power supply signal after determining frequency.
But filter is during the work time, inevitably generates electromagnetic interference, to reduce the electricity that filter generates
Magnetic disturbance, EMC（Full name in English：Electromagnetic Compatibility, Chinese name：Electro Magnetic Compatibility）Filter
It comes into being.EMC refers to that equipment or system meet the requirements in its electromagnetic environment and operation and does not set to any in its environment
The standby ability for generating intolerable electromagnetic disturbance.EMC filter is suitable for inhibiting electric network noise and higher harmonics and Switching Power Supply
Generated noise and high-frequency harmonic.
But EMC filter, when being filtered, narrower bandwidth can only be to the electricity of narrow frequency separation
Magnetic wave is filtered, and working efficiency is lower.
Summary of the invention
The embodiment of the present invention provides a kind of filter, is able to solve EMC filter in the prior art and is being filtered
When, narrower bandwidth can only be filtered the electromagnetic wave of narrow frequency separation, the lower problem of working efficiency.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that：
In a first aspect, the embodiment of the present invention provides a kind of filter, including：At least one filter module, when it is described at least one
It when the number of filter module is greater than or equal to 2, connects between at least one described filter module, the filter module includes first
Filter unit and the second filter unit, first filter unit and second filter unit series connection；
Wherein, the resonance frequency of first filter unit is the first resonance frequency, when the power frequency in the filter is small
When first resonance frequency, the impedance operator of first filter unit is perception, the electricity in the first filter
When flowing frequency greater than first resonance frequency, the impedance operator of first filter unit is capacitive；
The resonance frequency of second filter unit is the second resonance frequency, when the power frequency in the filter is less than described
When the second resonance frequency, the impedance operator of second filter unit is perception, the power frequency in the second filter
When greater than second resonance frequency, the impedance operator of second filter unit is capacitive；
First resonance frequency and second resonance frequency are unequal.
Filter provided in an embodiment of the present invention, including at least one filter module, filter module include that the first filtering is single
Member and the second filter unit, the first filter unit and the series connection of the second filter unit.Because there are two different for two filter units
Resonance frequency, the first resonance frequency and the second resonance frequency can inhibit wave so that the bandwidth of filter module increases
Frequency separation increase, enhance the working efficiency of filter, solve EMC filter in the prior art and be filtered
When, narrower bandwidth can only be filtered the electromagnetic wave of narrow frequency separation, the lower problem of working efficiency.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art
Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the invention
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of filter construction schematic diagram provided in an embodiment of the present invention；
Fig. 2 is a kind of filter equivalent circuit structure schematic diagram provided in an embodiment of the present invention；
Fig. 3 is a kind of filter impedance characteristic schematic diagram provided in an embodiment of the present invention；
Fig. 4 is a kind of interference wave amplitude size test effect figure provided in an embodiment of the present invention；
Fig. 5 is a kind of filtering modular structure schematic diagram provided in an embodiment of the present invention；
Fig. 6 is a kind of coil canoe effect diagram provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of filter, it is preferred that the filter can be EMC filter, referring to Fig.1 institute
Show, which includes at least one filter module 101, when the number of at least one filter module is greater than or equal to 2, until
It being serially connected between a few filter module, filter module 101 includes the first filter unit 1011 and the second filter unit 1012,
First filter unit 1011 and the series connection of the second filter unit 1012.Certainly, two filter modules are shown in Fig. 1, are only illustrated
Illustrate, does not represent that the present invention is limited 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
When one resonance frequency, the impedance operator of the first filter unit is perception, when the power frequency in first filter is humorous greater than first
When vibration frequency, the impedance operator of the first filter unit is capacitive.
The resonance frequency of second filter unit is the second resonance frequency, when the power frequency in filter is less than the second resonance
When frequency, the impedance operator of the second filter unit is perception, when the power frequency in second filter is greater than the second resonance frequency
When, the impedance operator of the second filter unit is capacitive.
First resonance frequency and the second resonance frequency are unequal.
Optionally, the equivalent circuit diagram of first filter unit 1011 and the second filter unit 1012 is such as in filter module 101
Shown in Fig. 2, including resistance 201, capacitor 202 and inductance 203, the first filter unit 1011 and the second filter unit 1012 all can be
Emotional resistance is presented when being less than own resonance frequency in power frequency, and capacitive resistance is presented when power frequency is greater than own resonance frequency
It is anti-.
Herein, it is illustrated so that the first resonance frequency is less than the second resonance frequency as an example, referring to shown in Fig. 3, Fig. 3 is shown
The impedance characteristic of first filter unit 1011 and the second filter unit 1012.First resonance frequency is f1, the second resonance frequency
Rate is f2, for filter module 101, it is less than f in power frequency1When, the resistance of the first filter unit 1011 is presented in filter module 101
Perception is presented in anti-characteristic, as the increase impedance of power frequency increases；When power frequency is greater than f1When, filter module 101 is presented
The impedance operator of first filter unit 1011, is presented capacitive, and impedance is reduced with the increase of power frequency；Work as power frequency
Reach frequency f corresponding to the intersection point of two impedance characteristics3When, the second filter unit 1012 is presented in filter module 101
Impedance operator becomes perception, and its impedance increases with the increase of power frequency；When power frequency is greater than f2When, filtering
The impedance operator of the second filter unit 1012 is presented in module 101, becomes capacitive, impedance subtracts with the increase of power frequency
It is few.In this way, compared with the prior art, filter only has single resonance frequency, bandwidth is comparatively limited to, and the present invention two
A filter unit has different resonance frequencies, so that the bandwidth of filter module 101 increases, it can be to the frequency that wave is inhibited
Rate section increases, and enhances the working efficiency of filter.
Referring to shown in Fig. 4, Fig. 4 shows the filter that filter 10 provided in an embodiment of the present invention is provided with the prior art
Wave amplitude size test effect contrast schematic diagram is interfered, horizontal axis is power frequency, and the longitudinal axis is interference wave amplitude size, by Fig. 5
It can be seen that, filter 10 provided in an embodiment of the present invention holds interference wave during power frequency is gradually increased
Continuous inhibiting effect, and interfere the inhibiting effect of wave with regard to very little after power frequency is more than 2MHz in the prior art.
Optionally, referring to Figure 5, the first filter unit 1011 includes first coil 10111, the second filter unit 1012
Including the second coil 10121, the second coil 10121 is enameled wire, and first coil 10111 is wrapped in 10121 outer layer of the second coil.
Preferably, filter module 101 further includes magnetic core 1013, and the second coil 10121 is wrapped on magnetic core 1013.Optionally, First Line
Circle 10121 can be flat wire.
Further alternative, the first resonance frequency is greater than the second resonance frequency, and the number of turns of first coil is less than the second coil
The number of turns.
It is further alternative, as shown in fig. 6, first coil is clockwise according to the second end from the first end of magnetic core to magnetic core
Direction winding.Second coil is counterclockwise wound according to the first end from the second end of magnetic core to magnetic core.
Because first coil and the second coil one, in outer layer, one, in internal layer, is wrapped on the same magnetic core, certain journey
PCB is saved on degree（Full name in English：Printed Circuit Board, Chinese name：Printed circuit board）The space of plate.And
And in first coil and the second coil, the magnetic field that the magnetic field and interference electric current that operating current generates generate offsets each other, magnetic core
Will not be saturated, the cross section of the second coil is small, around the number of turns it is more, inductance is larger, can filter out the interference of low frequency, first coil
Cross section is big, around the number of turns it is few, inductance is smaller, can filter out the interference of high frequency, and the two combines the filtering for allowing for filter
Bandwidth increases, and improves filtration efficiency.
Filter provided in an embodiment of the present invention, including at least one filter module, filter module include that the first filtering is single
Member and the second filter unit, the first filter unit and the series connection of the second filter unit.Because there are two different for two filter units
Resonance frequency, the first resonance frequency and the second resonance frequency can inhibit wave so that the bandwidth of filter module increases
Frequency separation increase, enhance the working efficiency of filter, solve EMC filter in the prior art and be filtered
When, narrower bandwidth can only be filtered the electromagnetic wave of narrow frequency separation, the lower problem of working efficiency.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that：It still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (4)
1. a kind of filter, which is characterized in that including：At least one filter module, as of at least one filter module
It connects when number is greater than or equal to 2, between at least one described filter module, the filter module includes the first filter unit and the
Two filter units, first filter unit and second filter unit series connection；
Wherein, the resonance frequency of first filter unit is the first resonance frequency, when the power frequency in the filter is small
When first resonance frequency, the impedance operator of first filter unit is perception, when the electric current frequency in the filter
When rate is greater than first resonance frequency, the impedance operator of first filter unit is capacitive；
The resonance frequency of second filter unit is the second resonance frequency, when the power frequency in the filter is less than described
When the second resonance frequency, the impedance operator of second filter unit is perception, when the power frequency in the filter is greater than
When second resonance frequency, the impedance operator of second filter unit is capacitive；
First resonance frequency and second resonance frequency are unequal；
First filter unit includes first coil, and second filter unit includes the second coil, and second coil is
Enameled wire, the first coil are wrapped in the second coil outer layer；
First resonance frequency is greater than second resonance frequency, and the number of turns of the first coil is less than second coil
The number of turns.
2. filter according to claim 1 to 2, which is characterized in that the filter module further includes magnetic core, and described first
Coil is wrapped on the magnetic core；
The first coil is wound clockwise according to the second end from the first end of the magnetic core to the magnetic core；
Second coil is counterclockwise wound according to the first end from the second end of the magnetic core to the magnetic core.
3. rate wave device according to claim 1, which is characterized in that
The filter module further includes magnetic core, and second coil is wrapped on the magnetic core.
4. filter described in -3 according to claim 1, which is characterized in that
The filter is Electro Magnetic Compatibility EMC filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810751771.2A CN108923764A (en) | 2015-06-02 | 2015-06-02 | A kind of filter |
Applications Claiming Priority (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 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510296150.6A Division CN104917477A (en) | 2015-06-02 | 2015-06-02 | Filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108923764A true CN108923764A (en) | 2018-11-30 |
Family
ID=54086244
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510296150.6A Pending CN104917477A (en) | 2015-06-02 | 2015-06-02 | Filter |
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| CN (2) | CN108923764A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113225037A (en) * | 2021-03-26 | 2021-08-06 | 洛坦电子科技(上海)有限公司 | Filter for silicon carbide high-frequency controller |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107395153A (en) * | 2017-07-11 | 2017-11-24 | 西安交通大学 | A kind of self-shielding type low-pass filtering module |
| CN107359866A (en) * | 2017-07-11 | 2017-11-17 | 西安交通大学 | A kind of integral type low-pass filtering module |
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| US4779068A (en) * | 1985-09-06 | 1988-10-18 | Murata Manufacturing Co., Ltd. | Noise suppression inductor |
| JPH05327039A (en) * | 1992-05-21 | 1993-12-10 | Tokyo Electric Power Co Inc:The | Superconducting current limiter |
| CN201112037Y (en) * | 2007-09-10 | 2008-09-10 | 李正雄 | Electric-sensing structure used in wide frequency |
| 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 |
| JP2014107435A (en) * | 2012-11-28 | 2014-06-09 | Tdk Corp | Common mode filter |
| US20140167903A1 (en) * | 2012-12-19 | 2014-06-19 | Tdk Corporation | Common mode filter |
| US20150002236A1 (en) * | 2013-06-28 | 2015-01-01 | Peregrine Semiconductor Corporation | Systems and Methods of Stacking LC Tanks for Wide Tuning Range and High Voltage Swing |
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| US7180389B2 (en) * | 2004-12-17 | 2007-02-20 | Virginia Tech Intellectual Properties, Inc. | EMI filter and frequency filters having capacitor with inductance cancellation loop |
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- 2015-06-02 CN CN201510296150.6A patent/CN104917477A/en active Pending
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| US4779068A (en) * | 1985-09-06 | 1988-10-18 | Murata Manufacturing Co., Ltd. | Noise suppression inductor |
| JPH05327039A (en) * | 1992-05-21 | 1993-12-10 | Tokyo Electric Power Co Inc:The | Superconducting current limiter |
| CN201112037Y (en) * | 2007-09-10 | 2008-09-10 | 李正雄 | Electric-sensing structure used in wide frequency |
| 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 |
|---|---|---|---|---|
| CN113225037A (en) * | 2021-03-26 | 2021-08-06 | 洛坦电子科技(上海)有限公司 | Filter for silicon carbide high-frequency controller |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104917477A (en) | 2015-09-16 |
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181130 |
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| RJ01 | Rejection of invention patent application after publication |