CN104901645A - Novel network filter circuit - Google Patents
Novel network filter circuit Download PDFInfo
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- CN104901645A CN104901645A CN201510260893.8A CN201510260893A CN104901645A CN 104901645 A CN104901645 A CN 104901645A CN 201510260893 A CN201510260893 A CN 201510260893A CN 104901645 A CN104901645 A CN 104901645A
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Abstract
The invention discloses a novel network filter circuit, comprising a common mode rejection unit, a high frequency common mode noise and differential mode noise filtering unit, a signal coupling and electric isolation unit, and a low frequency common mode noise filtering unit. And output end of the common mode rejection unit is connected with an input end of the high frequency common mode noise and differential mode noise filtering unit. An output end of the high frequency common mode noise and differential mode noise filtering unit is connected with an input end of the signal coupling and electric isolation unit. An output end of the signal coupling and electric isolation unit is connected with an input end of the low frequency common mode noise filtering unit. The novel network filter circuit has the advantages of low manufacturing cost, little manufacture variation, stable quality and so on.
Description
Technical field
The invention belongs to network filter technical field, be specifically related to a kind of new network filter circuit.
Background technology
Network filter is a kind of magnet assembly connected between Ethernet transceiving chip and terminal device interface, mainly plays the effects such as Signal transmissions, impedance matching, waveform reparation, noise suppression and electrical isolation.The quality characteristic of network filter directly affects the performance of whole network transmission system.
Traditional network filter circuit forms primarily of multiple magnetic ring coil, and its production technology is difficult, and processing cost is high, makes the defects such as variation is large, and quality is unstable.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of new network filter circuit, has processing cost low, make variation little, the advantages such as stay in grade.
The technical solution adopted in the present invention is: a kind of new network filter circuit, comprise common mode inhibition unit, high frequency common mode noise and differential mode noise filtering unit, signal coupling and electrical isolation unit, low frequency common noise filtering unit, the output of described common mode inhibition unit is connected with the input of high frequency common mode noise and differential mode noise filtering unit, the output of described high frequency common mode noise and differential mode noise filtering unit is connected with the input of signal coupling and electrical isolation unit, the output of described signal coupling and electrical isolation unit is connected with the input of low frequency common noise filtering unit, described high frequency common mode noise and differential mode noise filtering unit and low frequency common noise filtering unit include CT line, ground connection after the input of the CT line in described high frequency common mode noise and differential mode noise filtering unit and high frequency common mode noise and differential mode noise filtering unit is connected, ground connection after CT line in described low frequency common noise filtering unit is connected with the input of low frequency common noise filtering unit, described common mode inhibition unit is made up of the co-mode coil be wound on same magnetic material, described high frequency common mode noise and differential mode noise filtering unit are made up of the filtering electric capacity be connected in parallel between circuit, described filtering electric capacity is two, described signal coupling and electrical isolation unit are made up of the isolation capacitance be series between circuit, described low frequency common noise filtering unit is made up of the inductance be wound on same magnetic material, described common mode inhibition unit, high frequency common mode noise and differential mode noise filtering unit, signal coupling and electrical isolation unit, low frequency common noise filtering unit is array.
As preferably, when the representative value of the coil of described array common mode inhibition unit is 30MHz-1GHz, Impedance Peak is 100 ohm-5000 ohm.
As preferably, the capacitance representative of described array high frequency common mode noise and differential mode noise filtering unit is 1pF-1nF.
As preferably, the capacitance representative of described array signal coupling and electrical isolation unit is 1nF-1uF.
As preferably, the inductance representative value of described array low frequency common noise filtering unit is 100uH-2mH.
Beneficial effect of the present invention is: common mode inhibition unit, high frequency common mode noise and differential mode noise filtering unit, signal coupling and electrical isolation unit and low frequency common noise filtering unit composition filter circuit, can effective filtering noise information.And filter circuit can all use SMD surface mount elements, having can the feature of automated production, and stay in grade does not limit by human factor, has processing cost low, and it is little to make variation, the advantages such as stay in grade.Meanwhile, owing to being provided with CT line, the better effects if of filtering noise information is made.
Accompanying drawing explanation
Fig. 1 is line map of the present invention.
In figure: 1, common mode inhibition unit; 2, high frequency common mode noise and differential mode noise filtering unit; 3, signal coupling and electrical isolation unit; 4, low frequency common noise filtering unit.
Embodiment
Below in conjunction with the accompanying drawings and the specific embodiments the present invention is described in further detail.
As shown in Figure 1, a kind of new network filter circuit, comprise common mode inhibition unit 1, high frequency common mode noise and differential mode noise filtering unit 2, signal coupling and electrical isolation unit 3, low frequency common noise filtering unit 4, the output of described common mode inhibition unit 1 is connected with the input of high frequency common mode noise and differential mode noise filtering unit 2, the output of described high frequency common mode noise and differential mode noise filtering unit 2 is connected with the input of signal coupling and electrical isolation unit 3, the output of described signal coupling and electrical isolation unit 3 is connected with the input of low frequency common noise filtering unit 4, described high frequency common mode noise and differential mode noise filtering unit 2 and low frequency common noise filtering unit 4 include CT line, ground connection after the input of the CT line in described high frequency common mode noise and differential mode noise filtering unit 2 and high frequency common mode noise and differential mode noise filtering unit 2 is connected, ground connection after CT line in described low frequency common noise filtering unit 4 is connected with the input of low frequency common noise filtering unit 4, described common mode inhibition unit 1 is made up of the co-mode coil be wound on same magnetic material, described high frequency common mode noise and differential mode noise filtering unit 2 are made up of the filtering electric capacity be connected in parallel between circuit, described filtering electric capacity is two, described signal coupling and electrical isolation unit 3 are made up of the isolation capacitance be series between circuit, described low frequency common noise filtering unit 4 is made up of the inductance be wound on same magnetic material, described common mode inhibition unit 1, high frequency common mode noise and differential mode noise filtering unit 2, signal coupling and electrical isolation unit 3, low frequency common noise filtering unit 4 is array.
In the present embodiment, when the representative value of the coil of described array common mode inhibition unit 1 is 30MHz-1GHz, Impedance Peak is 100 ohm-5000 ohm.
In the present embodiment, the capacitance representative of described array high frequency common mode noise and differential mode noise filtering unit 2 is 1pF-1nF.
In the present embodiment, the capacitance representative of described array signal coupling and electrical isolation unit 3 is 1nF-1uF.
In the present embodiment, the inductance representative value of described array low frequency common noise filtering unit 4 is 100uH-2mH.
In this circuit, the work strip bandpass filter of array high frequency common mode noise and differential mode noise filtering unit 2 and array low frequency common noise filtering unit 4 common formation network filter.And the electronic devices and components said in this circuit can all use SMD surface mount elements, having can the feature of automated production, and stay in grade does not limit by human factor, has processing cost low, and it is little to make variation, the advantages such as stay in grade.CT line is two, and a CT line is connected rear ground connection, ground connection after another CT line is connected with the input of low frequency common noise filtering unit 4 with the input of high frequency common mode noise and differential mode noise filtering unit 2.The setting of CT line, the filtering for noise provides a low-impedance passage, can more effective filtering noise information.
The foregoing is only the preferred embodiment of the present invention, and be not used to limit practical range of the present invention, therefore anyly do not depart from equivalence change that structure of the present invention, feature and principle do or modify, all belong within protection scope of the present invention.
Claims (5)
1. a new network filter circuit, it is characterized in that: comprise common mode inhibition unit (1), high frequency common mode noise and differential mode noise filtering unit (2), signal coupling and electrical isolation unit (3), low frequency common noise filtering unit (4), the output of described common mode inhibition unit (1) is connected with the input of high frequency common mode noise and differential mode noise filtering unit (2), the output of described high frequency common mode noise and differential mode noise filtering unit (2) is connected with the input of signal coupling and electrical isolation unit (3), the output of described signal coupling and electrical isolation unit (3) is connected with the input of low frequency common noise filtering unit (4), described high frequency common mode noise and differential mode noise filtering unit (2) and low frequency common noise filtering unit (4) include CT line, ground connection after the input of the CT line in described high frequency common mode noise and differential mode noise filtering unit (2) and high frequency common mode noise and differential mode noise filtering unit (2) is connected, ground connection after CT line in described low frequency common noise filtering unit (4) is connected with the input of low frequency common noise filtering unit (4), described common mode inhibition unit (1) is made up of the co-mode coil be wound on same magnetic material, described high frequency common mode noise and differential mode noise filtering unit (2) are made up of the filtering electric capacity be connected in parallel between circuit, described filtering electric capacity is two, described signal coupling and electrical isolation unit (3) are made up of the isolation capacitance be series between circuit, described low frequency common noise filtering unit (4) is made up of the inductance be wound on same magnetic material, described common mode inhibition unit (1), high frequency common mode noise and differential mode noise filtering unit (2), signal coupling and electrical isolation unit (3), low frequency common noise filtering unit (4) is array.
2. a kind of new network filter circuit according to claim 1, is characterized in that: when the representative value of the coil of described array common mode inhibition unit (1) is 30MHz-1GHz, Impedance Peak is 100 ohm-5000 ohm.
3. a kind of new network filter circuit according to claim 1 and 2, is characterized in that: the capacitance representative of described array high frequency common mode noise and differential mode noise filtering unit (2) is 1pF-1nF.
4. a kind of new network filter circuit according to claim 1 and 2, is characterized in that: the capacitance representative of described array signal coupling and electrical isolation unit (3) is 1nF-1uF.
5. a kind of new network filter circuit according to claim 1 and 2, is characterized in that: the inductance representative value of described array low frequency common noise filtering unit (4) is 100uH-2mH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510260893.8A CN104901645A (en) | 2015-05-20 | 2015-05-20 | Novel network filter circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510260893.8A CN104901645A (en) | 2015-05-20 | 2015-05-20 | Novel network filter circuit |
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| CN104901645A true CN104901645A (en) | 2015-09-09 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106330129A (en) * | 2016-08-31 | 2017-01-11 | 安徽赛福电子有限公司 | High and low frequency combined network filter |
| CN107579719A (en) * | 2017-08-23 | 2018-01-12 | 成都天奥技术发展有限公司 | Fast parameter matches power-supply filter assembly |
| WO2020199148A1 (en) * | 2019-04-03 | 2020-10-08 | 杭州涂鸦信息技术有限公司 | Network port filter and network device |
| CN113412044A (en) * | 2021-06-22 | 2021-09-17 | 厦门翔澧工业设计有限公司 | Equipment shell for filtering clutter and equipment with equipment shell |
| CN113471647A (en) * | 2021-06-22 | 2021-10-01 | 厦门翔澧工业设计有限公司 | Clutter filtering device, preparation method, use method and equipment thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106330129A (en) * | 2016-08-31 | 2017-01-11 | 安徽赛福电子有限公司 | High and low frequency combined network filter |
| CN107579719A (en) * | 2017-08-23 | 2018-01-12 | 成都天奥技术发展有限公司 | Fast parameter matches power-supply filter assembly |
| CN107579719B (en) * | 2017-08-23 | 2020-08-11 | 成都天奥技术发展有限公司 | Fast parameter matching power filter assembly |
| WO2020199148A1 (en) * | 2019-04-03 | 2020-10-08 | 杭州涂鸦信息技术有限公司 | Network port filter and network device |
| CN113412044A (en) * | 2021-06-22 | 2021-09-17 | 厦门翔澧工业设计有限公司 | Equipment shell for filtering clutter and equipment with equipment shell |
| CN113471647A (en) * | 2021-06-22 | 2021-10-01 | 厦门翔澧工业设计有限公司 | Clutter filtering device, preparation method, use method and equipment thereof |
| CN113471647B (en) * | 2021-06-22 | 2022-03-08 | 厦门翔澧工业设计有限公司 | Clutter filtering device, preparation method, use method and equipment thereof |
| CN113412044B (en) * | 2021-06-22 | 2024-01-19 | 厦门翔澧工业设计有限公司 | Clutter filtering equipment shell and equipment with equipment shell |
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Application publication date: 20150909 |
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