CN102916669B - Filter circuit - Google Patents
Filter circuit Download PDFInfo
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- CN102916669B CN102916669B CN201110217459.3A CN201110217459A CN102916669B CN 102916669 B CN102916669 B CN 102916669B CN 201110217459 A CN201110217459 A CN 201110217459A CN 102916669 B CN102916669 B CN 102916669B
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Abstract
The present invention discloses a kind of filter circuit, some transmission channels of the physics end relative with cable end including cable end and connecting line cable-end and physics end, each transmission channel transmits a pair differential signal, one transmission channel is connected to transformator, described transformator is provided with the first end and the second end that are connected with cable end, described transformator is from isolating a common-mode signal between the first end and the second end, this common-mode signal is by the control circuit of a capacitances to physics end, so can reduce common mold noise interference, it is ensured that stable signal transmission.
Description
[technical field]
The present invention relates to a kind of filter circuit, particularly relate to a kind of filter circuit for electric connector.
[background technology]
Existing filter circuit, one end is cable end, in order to be electrically connected with butt connector, the other end is physics end, in order to, on externally connected circuit board, to be provided with some transmission channels between cable end and physics end, transmission channel is provided with the transformator near cable end, this transformator is provided with the coil near cable end, and the centre cap of described coil passes through series resistance and electric capacity to be grounded. But when high frequency common mode noise occurs in cable end, physics end output voltage can be made to uprise, affect signal normal transmission.
Therefore, it is necessary to improve to solve aforementioned drawback of the prior art to aforementioned filter circuit in fact.
[summary of the invention]
A kind of filter circuit reducing common mold noise interference of offer is provided.
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that a kind of filter circuit, some transmission channels of the physics end relative with cable end including cable end and connecting line cable-end and physics end, each transmission channel transmits a pair differential signal, one transmission channel is connected to transformator, described transformator is provided with the first end and the second end that are connected with cable end, described transformator is from isolating a common-mode signal between the first end and the second end, and this common-mode signal is by the control circuit of a capacitances to physics end.
Compared with prior art, it is an advantage of the current invention that: common-mode signal is by the control circuit of capacitances to physics end, it is possible to decrease common mold noise interference, it is ensured that stable signal transmission.
[accompanying drawing explanation]
Fig. 1 is filter circuit of the present invention first embodiment circuit diagram;
Fig. 2 is filter circuit of the present invention second embodiment circuit diagram;
Fig. 3 is filter circuit the 3rd embodiment circuit diagram of the present invention;
Fig. 4 is filter circuit the 4th embodiment circuit diagram of the present invention;
Fig. 5 is filter circuit the 5th embodiment circuit diagram of the present invention;
Fig. 6 is filter circuit the 6th embodiment circuit diagram of the present invention.
[detailed description of the invention]
As it is shown in figure 1, be filter circuit of the present invention first embodiment circuit diagram. Filter circuit 1 includes some transmission channels of the cable end 11 physics end 12 relative with cable end 11 and connecting line cable-end 11 and physics end 12. Each transmission channel transmits a pair differential signal, and transmission channel includes the first transmission channel the 13, second transmission channel the 14, the 3rd transmission channel 15 and the 4th transmission channel 16 being arranged in order. Each transmission channel is connected to electronic component, for the second transmission channel 14, is connected to transformator 17 and two-wire common mode choke 18. Two-wire common mode choke 18 is between transformator 17 and cable end 11. Transformator 17 includes the first winding 171 near cable end 11 and the second winding 172 near physics end 12, and the first winding 171 includes first end the 1710, second end 1711. Two-wire common mode choke 18 includes the tertiary winding 181 and the 4th winding 182, and the first end 1710 is connected with the tertiary winding 181 and is connected to cable end 11; Second end 1711 is connected with the 4th winding 182 and is connected to cable end 11. Isolating a centre cap 173 in order to transmit a common-mode signal between first end 1710 and the second end 1711, this centre cap 173 is connected an electric capacity 174 be connected to the control circuit 175 of physics end 12 thus forming a circuit pathways. When cable end 11 exists high frequency common mode noise, by the feedback of foregoing circuit path, reducing physics end 12 output voltage thus reducing common mold noise interference, making signal transmission steadily.
As in figure 2 it is shown, be filter circuit of the present invention second embodiment circuit diagram. Filter circuit 2 includes some transmission channels of the cable end 21 physics end 22 relative with cable end 21 and connecting line cable-end 21 and physics end 22. Each transmission channel transmits a pair differential signal, and transmission channel includes the first transmission channel the 23, second transmission channel the 24, the 3rd transmission channel 25 and the 4th transmission channel 26 being arranged in order. Each transmission channel is connected to electronic component, equally for the second transmission channel 24, is connected to transformator 27, two-wire common mode choke 28 and three line common mode chokes 29. Transformator 27 is between two-wire common mode choke 28 and three line common mode chokes 29, and two-wire common mode choke 28 is near cable end 21 side, and three line common mode chokes 29 are near physics end 22 side. Transformator 27 includes the first winding 271 near cable end 21 and the second winding 272 near physics end 22, and the first winding 271 includes first end the 2710, second end 2711. Two-wire common mode choke 28 includes the tertiary winding 281 and the 4th winding 282, and the first end 2710 is connected with the tertiary winding 281 and is connected to cable end 21; Second end 2711 is connected with the 4th winding 282 and is connected to cable end 21. Three line common mode chokes 29 include the 5th winding the 291, the 6th winding 292 and the 7th winding 293, and second winding 272 one end is connected with the 5th winding 291, and the other end and the 7th winding 293 connect. Isolating a centre cap 273 in order to transmit a common-mode signal between first end 2710 and the second end 2711, this centre cap 273 is connected an electric capacity 274 be connected to the control circuit 275 of physics end 22 thus forming a circuit pathways. When cable end 21 exists high frequency common mode noise, by the feedback of foregoing circuit path, reducing physics end 22 output voltage thus reducing common mold noise interference, making signal transmission steadily. Second winding 272 is isolated the second centre cap 276 and is connected with the 6th winding. Compared with the first embodiment, the second embodiment filter circuit 2 increases by one or three line common mode chokes 29, it is possible to reach better filter effect.
As it is shown on figure 3, be filter circuit the 3rd embodiment circuit diagram of the present invention. Filter circuit 3 includes some transmission channels of the cable end 31 physics end 32 relative with cable end 31 and connecting line cable-end 31 and physics end 32. Each transmission channel transmits a pair differential signal, and transmission channel includes the first transmission channel the 33, second transmission channel the 34, the 3rd transmission channel 35 and the 4th transmission channel 36 being arranged in order. Each transmission channel is connected to electronic component, equally for the second transmission channel 34, is connected to transformator 37, two-wire common mode choke 38 and the second double line common mode choke 39. Transformator 37 is between two-wire common mode choke 38 and the second double line common mode choke 39, and two-wire common mode choke 38 is near cable end 31 side, and the second double line common mode choke 39 is near physics end 32 side. Transformator 37 includes the first winding 371 near cable end 31 and the second winding 372 near physics end 32, and the first winding 371 includes first end the 3710, second end 3711. Two-wire common mode choke 38 includes the tertiary winding 381 and the 4th winding 382, and the first end 3710 is connected with the tertiary winding 381 and is connected to cable end 31; Second end 3711 is connected with the 4th winding 382 and is connected to cable end 31. The second double line common mode choke 39 includes the 5th winding 391 and the 6th winding 392, and second winding 372 one end is connected with the 5th winding 391, and the other end and the 6th winding 392 connect. Isolating a centre cap 373 in order to transmit a common-mode signal between first end 3710 and the second end 3711, this centre cap 373 is connected an electric capacity 374 be connected to the control circuit 375 of physics end 32 thus forming a circuit pathways. When cable end 31 exists high frequency common mode noise, by the feedback of foregoing circuit path, reducing physics end 32 output voltage thus reducing common mold noise interference, making signal transmission steadily. Compared with the first embodiment, the 3rd embodiment filter circuit 3 increases a second double line common mode choke 39, it is possible to reach better filter effect.
As shown in Figure 4, for filter circuit the 4th embodiment circuit diagram of the present invention. Filter circuit 4 includes some transmission channels of the cable end 41 physics end 42 relative with cable end 41 and connecting line cable-end 41 and physics end 42. Each transmission channel transmits a pair differential signal, and transmission channel includes the first transmission channel the 43, second transmission channel the 44, the 3rd transmission channel 45 and the 4th transmission channel 46 being arranged in order. Each transmission channel is connected to electronic component, equally for the second transmission channel 44, is connected to transformator 47 and three line common mode chokes 48. Transformator 47 is near cable end 41, and three line common mode chokes 48 are near physics end 42. Transformator 47 includes the first winding 471 near cable end 41 and the second winding 472 near physics end 42, and the first winding 471 includes first end the 4710, second end 4711. Three line common mode chokes 48 include the tertiary winding the 481, the 4th winding 482 and the 5th winding 483, and first end the 4710, second end 4711 is connected directly to cable end 41 by wire. Second winding 472 one end is connected with the tertiary winding 481, and the other end and the 5th winding 483 connect. Isolating a centre cap 473 in order to transmit a common-mode signal between first end 4710 and the second end 4711, this centre cap 473 is connected an electric capacity 474 be connected to the control circuit 475 of physics end 42 thus forming a circuit pathways. When cable end 41 exists high frequency common mode noise, by the feedback of foregoing circuit path, reducing physics end 42 output voltage thus reducing common mold noise interference, making signal transmission steadily. Second winding 472 is isolated the second centre cap 476 and is connected with the 4th winding 482. Compared with the second embodiment, the 4th embodiment filter circuit 4 reduces a two-wire common mode choke, it is possible to when ensureing filter effect, reduce cost.
As it is shown in figure 5, be filter circuit the 5th embodiment circuit diagram of the present invention. Filter circuit 5 includes some transmission channels of the cable end 51 physics end 52 relative with cable end 51 and connecting line cable-end 51 and physics end 52. Each transmission channel transmits a pair differential signal, and transmission channel includes the first transmission channel the 53, second transmission channel the 54, the 3rd transmission channel 55 and the 4th transmission channel 56 being arranged in order. Each transmission channel is connected to electronic component, equally for the second transmission channel 54, is connected to transformator 57, two-wire common mode choke 58 and the second transformator 59. In present embodiment, transformator 57 is autotransformer close cable end 51, and the second transformator 59 is near physics end 52, and two-wire common mode choke 58 is between autotransformer 57 and the second transformator 59. Autotransformer 57 includes coil 571, coil 571 includes the first end 5710 and the second end 5711 and first end the 5710, second end 5711 is connected directly to cable end 51 respectively, isolating a centre cap 572 in order to transmit a common-mode signal between first end 5710 and the second end 5711, this centre cap 572 is connected an electric capacity 573 be connected to the control circuit 574 of physics end 52 thus forming a circuit pathways. When cable end 51 exists high frequency common mode noise, by the feedback of foregoing circuit path, reducing physics end 52 output voltage thus reducing common mold noise interference, making signal transmission steadily. The connected mode of autotransformer 57 and two-wire common mode choke the 58, second transformator 59 belongs to the customary means of those skilled in the art, does not repeat them here.
As shown in Figure 6, for filter circuit the 6th embodiment circuit diagram of the present invention. Filter circuit 6 includes some transmission channels of the cable end 61 physics end 62 relative with cable end 61 and connecting line cable-end 61 and physics end 62. Each transmission channel transmits a pair differential signal, and transmission channel includes the first transmission channel the 63, second transmission channel the 64, the 3rd transmission channel 65 and the 4th transmission channel 66 being arranged in order. Each transmission channel is connected to electronic component, equally for the second transmission channel 64, is connected to transformator 67, two-wire common mode choke the 68, second transformator 69 and three line common mode chokes 70. In present embodiment, transformator 67 is autotransformer near cable end 61, with the 5th embodiment the difference is that, between the second transformator 69 and physics end 62, be connected one or three line common mode chokes 70, so can reach better filter effect. Autotransformer 67 includes coil 671, coil 671 includes the first end 6710 and the second end 6711 and first end the 6710, second end 6711 is connected directly to cable end 61 respectively, isolating a centre cap 672 in order to transmit a common-mode signal between first end 6710 and the second end 6711, this centre cap 672 is connected an electric capacity 673 be connected to the control circuit 674 of physics end 62 thus forming a circuit pathways. When cable end 61 exists high frequency common mode noise, by the feedback of foregoing circuit path, reducing physics end 62 output voltage thus reducing common mold noise interference, making signal transmission steadily. Connected mode between autotransformer 67, two-wire common mode choke the 68, second transformator 69, three line common mode choke 70 belongs to the customary means of those skilled in the art, does not repeat them here.
The circuit pathways of filter circuit of the present invention is preferably provided in the second transmission channel, certainly may also be arranged on other transmission channels. Transformator is from isolating a common-mode signal between the first end and the second end, and this common-mode signal passes through the capacitances control circuit to physics end thus forming a circuit pathways. When cable end exists high frequency common mode noise, by the feedback of foregoing circuit path, reducing physics end output voltage thus reducing common mold noise interference, making signal transmission steadily.
Claims (9)
1. a filter circuit, including cable end, some transmission channels of the physics end relative with cable end and connecting line cable-end and physics end, each transmission channel transmits a pair differential signal, one transmission channel is connected to transformator, described transformator is provided with the first end and the second end that are connected with cable end, it is characterized in that: described transformator is from isolating a centre cap between the first end and the second end in order to transmit a common-mode signal, described centre cap is connected an electric capacity be connected to the control circuit of physics end thus forming a circuit pathways, when there is high frequency common mode noise in cable end, feedback by foregoing circuit path, reduce physics end output voltage thus reducing common mold noise interference, so that signal transmission is steadily.
2. filter circuit as claimed in claim 1, it is characterised in that: described transmission channel includes the first transmission channel, the second transmission channel, the 3rd transmission channel and the 4th transmission channel that are arranged in order, and described transformator is arranged at the second transmission channel.
3. filter circuit as claimed in claim 1, it is characterized in that: between described transformator and cable end, be connected to two-wire common mode choke, described transformator includes the first winding and the second winding, two-wire common mode choke includes the tertiary winding and the 4th winding, first end of described transformator, the second end are located on the first winding, first end is connected with the tertiary winding and is ultimately connected to cable end, and the second end and the 4th winding connect and be ultimately connected to cable end.
4. filter circuit as claimed in claim 3, it is characterized in that: between described transformator and physics end, be connected to three line common mode chokes, described three line common mode chokes include the 5th winding, the 6th winding and the 7th winding, second winding one end is connected with the 5th winding, the other end and the 7th winding connect, and the second winding is further provided with the second centre cap and the 6th winding connects.
5. filter circuit as claimed in claim 3, it is characterized in that: between described transformator and physics end, be connected to the second double line common mode choke, described the second double line common mode choke includes the 5th winding and the 6th winding, second winding one end is connected with the 5th winding, and the other end and the 6th winding connect.
6. filter circuit as claimed in claim 1, it is characterized in that: between described transformator and physics end, be connected to three line common mode chokes, transformator includes the first winding and the second winding, three line common mode chokes include the tertiary winding, the 4th winding and the 5th winding, first end of described transformator, the second end are located on the first winding, first end, the second end are connected directly to cable end, second winding one end is connected with the tertiary winding, the other end and the 5th winding connect, and the second winding is further provided with the second centre cap and the 4th winding connects.
7. filter circuit as claimed in claim 1, it is characterised in that: described transformator is autotransformer.
8. filter circuit as claimed in claim 7, it is characterised in that: it is connected with two-wire common mode choke and the second transformator between described autotransformer and physics end in turn.
9. filter circuit as claimed in claim 8, it is characterised in that: it is connected to three line common mode chokes between described second transformator and physics end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110217459.3A CN102916669B (en) | 2011-08-01 | 2011-08-01 | Filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110217459.3A CN102916669B (en) | 2011-08-01 | 2011-08-01 | Filter circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102916669A CN102916669A (en) | 2013-02-06 |
| CN102916669B true CN102916669B (en) | 2016-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110217459.3A Active CN102916669B (en) | 2011-08-01 | 2011-08-01 | Filter circuit |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105655759B (en) * | 2014-11-21 | 2019-02-12 | 富士康(昆山)电脑接插件有限公司 | Electric connector and electric connector system |
| CN106073733A (en) * | 2016-05-12 | 2016-11-09 | 华北电力大学（保定） | A kind of portable physiological stress Monitoring Indexes bracelet device |
| 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 |
| CN108737117A (en) * | 2018-04-13 | 2018-11-02 | 四川斐讯信息技术有限公司 | A kind of system that Ethernet is transmitted based on custom interface |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201266942Y (en) * | 2008-07-24 | 2009-07-01 | 富士康(昆山)电脑接插件有限公司 | Network interface circuit |
| CN201302914Y (en) * | 2008-10-15 | 2009-09-02 | 富士康(昆山)电脑接插件有限公司 | Electrical connector system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7808751B2 (en) * | 2004-04-28 | 2010-10-05 | Bel Fuse Inc. | Differential electrical surge protection within a LAN magnetics interface circuit |
| CN201430260Y (en) * | 2009-03-27 | 2010-03-24 | 富士康(昆山)电脑接插件有限公司 | Electric connector |
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2011
- 2011-08-01 CN CN201110217459.3A patent/CN102916669B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201266942Y (en) * | 2008-07-24 | 2009-07-01 | 富士康(昆山)电脑接插件有限公司 | Network interface circuit |
| CN201302914Y (en) * | 2008-10-15 | 2009-09-02 | 富士康(昆山)电脑接插件有限公司 | Electrical connector system |
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| CN102916669A (en) | 2013-02-06 |
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