CN102957148B - Filter circuit - Google Patents
Filter circuit Download PDFInfo
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- CN102957148B CN102957148B CN201110241265.7A CN201110241265A CN102957148B CN 102957148 B CN102957148 B CN 102957148B CN 201110241265 A CN201110241265 A CN 201110241265A CN 102957148 B CN102957148 B CN 102957148B
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- coil
- signal transmission
- filter circuit
- inductance
- inductance coil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
A filter circuit is applied to a connector. The filter circuit comprises a physical side, a cable side and signal transmission channels. The physical side and the cable side respectively serve as input and output, the signal transmission channels are connected between the two sides, the signal transmission channels are the same in structure, each signal transmission channel comprises a transformer and a common mode choke, the transformer comprises a first coil and a second coil mutually coupled, the first coil comprises two first connection ends and a first center tap positioned between the two first connection ends, the second coil comprises two second connection ends and a second center tap positioned between the two second connection ends, the common mode choke comprises a first inductance coil and a second inductance coil, the filter circuit further comprises a capacity cell and an earth point, each signal transmission channel further comprises an inductance element, one end of each inductance element of each signal transmission channel is short-circuited and then is connected to the earth point through the capacity cell, and accordingly electromagnetic interference of the filter circuit can be effectively reduced.
Description
[technical field]
The present invention relates to a kind of filter circuit, refer in particular to a kind of filter circuit with interconnective transformer and common mode choke being applied to connector.
[background technology]
The notification number announced October 21 calendar year 2001 is the TaiWan, China patent of 461599, its the 5th figure discloses a kind of filter circuit, the signal transmission passage that this filter circuit has input side and outlet side and is connected between these both sides, each signal transmission passage comprises transformer and common mode choke, each signal transmission passage includes centre cap, centre cap is connected to short circuit after resistance, and then connects earth point by electric capacity, and this filter circuit easily produces electromagnetic interference.
In view of above disappearance, a kind of filter circuit overcoming above defect of ad hoc meter.
[summary of the invention]
The technical problem to be solved in the present invention is a kind of filter circuit effectively reducing circuit electromagnetic interference provided.
For solving above-mentioned technical problem, the present invention adopts following technical scheme: a kind of filter circuit, it signal transmission passage comprising the physical side of input and output each other and cable-side and be connected between these both sides, the structure of each signal transmission passage is identical, each signal transmission passage comprises transformer and common mode choke, described transformer comprises intercouple first, second coil, first coil comprises two first links and the first centre cap between two first links, second coil comprises two second links and the second centre cap between two second links, common mode choke comprises first, second inductance coil, described filter circuit also includes capacity cell and earth point, wherein each signal transmission passage comprises inductance element further, after the inductance element shorted on one end of each signal transmission passage, earth point is connected to by capacity cell.
Compared with prior art, the present invention has the following advantages: in filter circuit of the present invention, each signal transmission passage is connected to inductance element, be connected to earth point by capacity cell again after each inductance element shorted on one end, effectively can reduce the electromagnetic interference of filter circuit.
[accompanying drawing explanation]
Fig. 1 is the circuit diagram of the filter circuit of first embodiment of the invention;
Fig. 2 is the circuit diagram of the filter circuit of second embodiment of the invention;
Fig. 3 is the circuit diagram of the filter circuit of third embodiment of the invention;
Fig. 4 is the circuit diagram of the filter circuit of fourth embodiment of the invention.
[embodiment]
The embodiment of filter circuit of the present invention is described in detail below in conjunction with accompanying drawing.
Refer to shown in Fig. 1, the filter circuit 1A of first embodiment of the invention is applied to connector, four signal transmission passages that described filter circuit 1A comprises the physical side 100A of input and output each other and cable-side 200A and is connected between these both sides.The structure of each signal transmission passage is identical, and each signal transmission passage comprises transformer 10A and common mode choke 20A.Transformer 10A comprises the first coil 11A and the second coil 12A that intercouple.First coil 11A is provided with and is connected to two first link 111A of physical side 100A and the first centre cap 112A between two first link 111A.Physical side 100A is connected to after first centre cap 112A short circuit of each signalling channel.Second coil 12A is provided with and is connected to two second link 121A of common mode choke 20A and the second centre cap 122A between two second link 121A.Common mode choke 20 is three-wire type, comprises the first inductance coil 21A, the second inductance coil 22A and the 3rd inductance coil 23A between first and second inductance coil.First, second inductance coil 21A, 22A respectively one end are connected to the first link 121A of the second coil 12A, and the other end is connected to cable-side 200A.Each signal transmission passage of described filter circuit 1A also includes inductance element 30 respectively.3rd inductance coil 23A one end is connected to the second centre cap 122A, and the other end is connected to inductance element 30.Inductance element 30 short circuit of inductance element 30 other end and other signal transmission passages, the node A that short circuit is formed is connected to electric capacity 40, and the other end of electric capacity 40 is connected to earth point 50.3rd inductance coil 23A is connected to the rear short circuit of inductance element 30, then connects electric capacity 40, finally connects earth point 50, effectively can reduce the electromagnetic interference of filter circuit.
Refer to shown in Fig. 2, in the filter circuit 1B of second embodiment of the invention, the first inductance coil 21B, the second inductance coil 22B are connected to physical side 100B in one end respectively, the other end is connected to the two first link 111B of the first coil 11B, be connected to physical side 100B after 3rd inductance coil 23B one end and other the 3rd inductance coil short circuits, the other end connects and the first centre cap 112B.The second link 121B of the second coil 12B is connected to cable end 200B, and the second centre cap 122B is connected to inductance element 30 one end.Inductance element 30 short circuit of inductance element 30 other end and other signal transmission passages, the node A that short circuit is formed is connected to electric capacity 40, and the other end of electric capacity 40 is connected to earth point 50.3rd inductance coil 23A is connected to the rear short circuit of inductance element 30, then connects electric capacity 40, finally connects earth point 50, effectively can reduce the electromagnetic interference of filter circuit.
Refer to shown in Fig. 3, in the filter circuit 1C of the third embodiment of the present invention, common mode choke 20C is twin wire, comprises the first inductance coil 21C and the second inductance coil 22C.First inductance coil 21C, the second inductance coil 22C are connected to physical side 100C in one end respectively, and the other end is connected to the first link 111C of the first coil 11C.Physical side is connected to after the first centre cap 11B short circuit of each signal transmission passage first coil 11C.Second coil 12C two second link 121C is connected to cable-side 200C, and the second centre cap 122C is connected to inductance element 30 one end.Inductance element 30 short circuit of inductance element 30 other end and other signal transmission passages, the node A that short circuit is formed is connected to electric capacity 40, and the other end of electric capacity 40 is connected to earth point 50.3rd inductance coil 23A is connected to the rear short circuit of inductance element 30, then connects electric capacity 40, finally connects earth point 50, effectively can reduce the electromagnetic interference of filter circuit.
Refer to shown in Fig. 4, in the filter circuit 1D of the fourth embodiment of the present invention, common mode choke 20D is twin wire, comprises the first inductance coil 21D and the second inductance coil 22D.First coil 11D two first link 112D is connected to physical side 100D, is connected to physical side 100D after the first centre cap 111D short circuit of the first centre cap 111D and other signal transmission passages.The two second link 121D of the second coil 12D are connected to one end of first, second inductance coil 21D, 22D, and the second centre cap 122D is connected to one end of inductance element 30.Inductance element 30 short circuit of inductance element 30 other end and other signal transmission passages, the node A that short circuit is formed is connected to electric capacity 40, and the other end of electric capacity 40 is connected to earth point 50.3rd inductance coil 23A is connected to the rear short circuit of inductance element 30, then connects electric capacity 40, finally connects earth point 50, effectively can reduce the electromagnetic interference of filter circuit.First, second inductance coil 21D, 22D one end is connected to the second link 121D of the second coil 12D, and the other end is connected to cable-side 200D.
The foregoing is only execution mode provided by the invention, it not whole or unique execution mode, the change of those of ordinary skill in the art by reading specification of the present invention to any equivalence that technical solution of the present invention is taked, is claim of the present invention and contains.
Claims (10)
1. a filter circuit, it signal transmission passage comprising the physical side of input and output each other and cable-side and be connected between these both sides, the structure of each signal transmission passage is identical, each signal transmission passage comprises transformer and common mode choke, described transformer comprises intercouple first, second coil, first coil comprises two first links and the first centre cap between two first links, second coil comprises two second links and the second centre cap between two second links, common mode choke comprises first, second inductance coil, described filter circuit also includes capacity cell and earth point, it is characterized in that: each signal transmission passage comprises inductance element further, after the inductance element shorted on one end of each signal transmission passage, earth point is connected to by capacity cell.
2. filter circuit as claimed in claim 1, is characterized in that: described second coil second centre cap is connected to inductance element one end, is connected to capacity cell after the inductance element short circuit of the inductance element other end and other signal transmission passages.
3. filter circuit as claimed in claim 2, it is characterized in that: two second links of described second coil are connected to cable-side, two first links of the first coil connect one end of first, second inductance coil respectively.
4. filter circuit as claimed in claim 3, it is characterized in that: described common mode choke is three-wire type, there is between first, second inductance coil the 3rd inductance coil, be connected to physical side after the 3rd mutual short circuit in inductance coil one end of each signal transmission passage, one end of first, second inductance coil is connected to physical side.
5. filter circuit as claimed in claim 3, is characterized in that: described common mode choke is TW two wire, and one end of the first inductance coil is connected to physical side, is connected to physical side after the first centre cap short circuit of each signal transmission passage first coil.
6. filter circuit as claimed in claim 2, it is characterized in that: two second links of described second coil are connected to one end of first, second inductance coil, first, second inductance coil other end is connected to cable-side, two first links of the first coil are connected to physical side, are connected to physical side after the first centre cap short circuit of each signal transmission passage.
7. filter circuit as claimed in claim 1, it is characterized in that: described common mode choke is three-wire type, comprise the 3rd inductance coil between first, second inductance coil further, first, second inductance coil is connected to cable-side, and the 3rd inductance coil is connected to the other end of inductance element.
8. filter circuit as claimed in claim 7, is characterized in that: described first coil two first link is connected to physical side, is connected to physical side after the first centre cap short circuit of each signal transmission passage.
9. filter circuit as claimed in claim 8, is characterized in that: described second coil two second link is connected to first, second inductance coil, and the second centre cap is connected to one end of the 3rd inductance coil.
10. filter circuit as claimed in claim 1, it is characterized in that: described first coil two first link is connected to physical side, be connected to physical side after first centre cap short circuit of each signal transmission passage, two second links of the second coil are connected to first, second inductance coil one end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110241265.7A CN102957148B (en) | 2011-08-22 | 2011-08-22 | Filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110241265.7A CN102957148B (en) | 2011-08-22 | 2011-08-22 | Filter circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102957148A CN102957148A (en) | 2013-03-06 |
| CN102957148B true CN102957148B (en) | 2015-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110241265.7A Active CN102957148B (en) | 2011-08-22 | 2011-08-22 | Filter circuit |
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| CN (1) | CN102957148B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104733363B (en) * | 2013-12-19 | 2017-07-14 | 中微半导体设备(上海)有限公司 | A kind of radio frequency filter circuit and electrostatic chuck |
| CN103731114B (en) * | 2014-01-03 | 2017-01-25 | 李建尧 | Filtering circuit |
| TWI528742B (en) * | 2014-01-13 | 2016-04-01 | 瑞昱半導體股份有限公司 | Emi suppression device and method for network transmission |
| US9780572B2 (en) * | 2014-10-27 | 2017-10-03 | Qualcomm Incorporated | Wireless power multi-coil mutual induction cancellation methods and apparatus |
| CN106340761B (en) * | 2015-07-10 | 2018-08-31 | 富士康(昆山)电脑接插件有限公司 | Network interface circuit and apply its network interface connector |
| CN108010694A (en) * | 2017-12-27 | 2018-05-08 | 深圳市共进电子股份有限公司 | Transformer and potential device for PHY chip |
| CN111049661B (en) * | 2019-11-26 | 2022-08-30 | 深圳欧陆通电子股份有限公司 | Digital network interface circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359994A (en) * | 2008-08-30 | 2009-02-04 | 深圳华为通信技术有限公司 | Method lowering network port radiation, port impedance matching circuit and apparatus |
| CN201266911Y (en) * | 2008-04-02 | 2009-07-01 | 富士康(昆山)电脑接插件有限公司 | Filtering circuit and electric connector with the circuit |
| CN201725997U (en) * | 2010-07-07 | 2011-01-26 | 宣德科技股份有限公司 | Improved module electric connector |
| CN201774246U (en) * | 2010-07-08 | 2011-03-23 | 富士康(昆山)电脑接插件有限公司 | Network connection common mode signal protection circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000315930A (en) * | 1999-04-30 | 2000-11-14 | Matsushita Electric Ind Co Ltd | Filter |
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- 2011-08-22 CN CN201110241265.7A patent/CN102957148B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201266911Y (en) * | 2008-04-02 | 2009-07-01 | 富士康(昆山)电脑接插件有限公司 | Filtering circuit and electric connector with the circuit |
| CN101359994A (en) * | 2008-08-30 | 2009-02-04 | 深圳华为通信技术有限公司 | Method lowering network port radiation, port impedance matching circuit and apparatus |
| CN201725997U (en) * | 2010-07-07 | 2011-01-26 | 宣德科技股份有限公司 | Improved module electric connector |
| CN201774246U (en) * | 2010-07-08 | 2011-03-23 | 富士康(昆山)电脑接插件有限公司 | Network connection common mode signal protection circuit |
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| CN102957148A (en) | 2013-03-06 |
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