CN204290901U - Signal filter circuit - Google Patents
Signal filter circuit Download PDFInfo
- Publication number
- CN204290901U CN204290901U CN201420705087.8U CN201420705087U CN204290901U CN 204290901 U CN204290901 U CN 204290901U CN 201420705087 U CN201420705087 U CN 201420705087U CN 204290901 U CN204290901 U CN 204290901U
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- Prior art keywords
- inductance
- electric capacity
- loop
- input
- filter circuit
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- 239000003990 capacitor Substances 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000002159 nanocrystal Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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- Filters And Equalizers (AREA)
Abstract
The utility model is a kind of signal filter circuit, comprise the first common mode inductance of inductance L 1 and inductance L 2 composition, the second common mode inductance that inductance L 3 and inductance L 4 form, described inductance L 1 accesses in N loop after connecting with inductance L 3, feedthrough capacitor C2 is in series with between this N loop input and described inductance L 1, described inductance L 2 accesses in P loop after connecting with inductance L 4, is in series with feedthrough capacitor C1 between the input in this P loop and described inductance L 2; Between described inductance L 1 and the input of inductance L 2, cross-over connection has electric capacity C3, between output, cross-over connection has electric capacity C4, the two ends of described electric capacity C4 are respectively through electric capacity C5, electric capacity C6 ground connection, electric capacity C9 is had in described inductance L 3 and the cross-over connection of inductance L 4 output, the two ends of this electric capacity C9 respectively all can effective filtering to the high, medium and low frequency electromagnetic interference of power supply and input signal through electric capacity C7 and C8 ground connection, have wide range of applications, overall structure is simple, with low cost, be conducive to the realization that filter is integrated, miniaturized.
Description
Technical field
The utility model relates to filter circuit field, is specifically related to a kind of signal filter circuit.
Background technology
Filter circuit, as a kind of conventional circuit, is widely used in electronic equipment of various, especially in the fields such as communication equipment, Aero-Space, on-board equipment, electromagnetic environment bandwidth, field intensity is large, higher to the requirement of filter circuit, will directly affect the safe and reliable operation of relevant device.The common mode disturbances of the conventional many employings of filter circuit multistage common mode inductance filtering frequency electromagnetic waves, poor to the filtration result of differential mode interference, simultaneously conventional filter circuit is also undesirable to the filtration result of low-frequency electromagnetic wave.
Utility model content
The utility model, for the deficiencies in the prior art, proposes a kind ofly have good common mode, Differential Mode insertion loss feature, high, medium and low frequency interference electromagnetic signal is all had to the signal filter circuit of better filtering effect.Concrete technical scheme is as follows:
A kind of signal filter circuit, it is characterized in that: the first common mode inductance comprising inductance L 1 and inductance L 2 composition, the second common mode inductance that inductance L 3 and inductance L 4 form, described inductance L 1 accesses in N loop after connecting with inductance L 3, feedthrough capacitor C2 is in series with between this N loop input and described inductance L 1, described inductance L 2 accesses in P loop after connecting with inductance L 4, is in series with feedthrough capacitor C1 between the input in this P loop and described inductance L 2; Between described inductance L 1 and the input of inductance L 2, cross-over connection has electric capacity C3, between the output of inductance L 1 and inductance L 2, cross-over connection has electric capacity C4, the two ends of described electric capacity C4 are respectively through electric capacity C5, electric capacity C6 ground connection, have electric capacity C9 in described inductance L 3 and the cross-over connection of inductance L 4 output, the two ends of this electric capacity C9 are respectively through electric capacity C7 and C8 ground connection; The output of described inductance L 3 and inductance L 4 is respectively as two outputs of filter circuit.
In the utility model, on the basis of two-stage common mode inductance, electric capacity C1 and C2 is utilized to form High frequency filter unit, can effective filtering high-frequency interferencing signal, electric capacity C3, C4 and C9 form intermediate frequency filtering unit, and electric capacity C5, C6, C7, C8 form low-frequency filter circuit, and whole circuit effectively achieves and carries out filtering to high, normal, basic frequency electromagnetic waves signal, structure is simple, has wide range of applications.
For better realizing the utility model, may further be:
Input in described N loop and P loop is respectively through TVS pipe D2 and TVS pipe D1 ground connection; the output of described inductance L 1 and inductance L 2 is gone back and is connected to resistance R1; TVS pipe D2, D1 and resistance R1 form protective circuit; wherein resistance R1 is metalfilmresistor; possess the effect absorbing instantaneous pressure, can power-supply fluctuation be prevented.
The magnet ring of described first common mode inductance and the second common mode inductance adopts iron based nano crystal material to make, and volume is little, is suitable for frequency wide in range, has good common mode, Differential Mode insertion loss characteristic.
The beneficial effects of the utility model are: all can effective filtering to the high, medium and low frequency electromagnetic interference of power supply and input signal, and have wide range of applications, protected effect is good; Overall structure is simple, with low cost, is conducive to the realization that filter is integrated, miniaturized.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in Figure 1: a kind of signal filter circuit, comprise the first common mode inductance of inductance L 1 and inductance L 2 composition, the second common mode inductance that inductance L 3 and inductance L 4 form, described inductance L 1 accesses in N loop after connecting with inductance L 3, described inductance L 2 accesses in P loop after connecting with inductance L 4, input in described N loop and P loop is respectively through TVS pipe D2 and D1 ground connection, feedthrough capacitor C2 is in series with between N loop input and described inductance L 1, feedthrough capacitor C1 is in series with between the input in this P loop and described inductance L 2, electric capacity C3 is parallel with at the input of described inductance L 1 and inductance L 2, output is also connected to electric capacity C4, the output of described inductance L 1 and inductance L 2 is gone back and is connected to resistance R1, at the input of described inductance L 3 and inductance L 4 respectively through electric capacity C6 and electric capacity C5 ground connection, output is also connected to electric capacity C9, at the output of loop P and N respectively through electric capacity C8 and electric capacity C7 ground connection.
Wherein the capacity of electric capacity C3 and C4 is 1uF, and electric capacity C5, C6, C7 and C8 capacity is 0.01uF, and electric capacity C9 capacity is 0.22uF, and the magnet ring of the first common mode inductance and the second common mode inductance adopts iron based nano crystal material to make.
Claims (3)
1. a signal filter circuit, it is characterized in that: the first common mode inductance comprising inductance L 1 and inductance L 2 composition, the second common mode inductance that inductance L 3 and inductance L 4 form, described inductance L 1 accesses in N loop after connecting with inductance L 3, feedthrough capacitor C2 is in series with between this N loop input and described inductance L 1, described inductance L 2 accesses in P loop after connecting with inductance L 4, is in series with feedthrough capacitor C1 between the input in this P loop and described inductance L 2;
Between described inductance L 1 and the input of inductance L 2, cross-over connection has electric capacity C3, between the output of inductance L 1 and inductance L 2, cross-over connection has electric capacity C4, the two ends of described electric capacity C4 are respectively through electric capacity C5, electric capacity C6 ground connection, have electric capacity C9 in described inductance L 3 and the cross-over connection of inductance L 4 output, the two ends of this electric capacity C9 are respectively through electric capacity C7 and C8 ground connection;
The output of described inductance L 3 and inductance L 4 is respectively as two outputs of filter circuit.
2. signal filter circuit according to claim 1, is characterized in that: the input in described N loop and P loop is respectively through TVS pipe D2 and TVS pipe D1 ground connection, and on the output of described inductance L 1 and inductance L 2, also cross-over connection has resistance R1.
3. signal filter circuit according to claim 1, is characterized in that: the magnet ring of described first common mode inductance and the second common mode inductance adopts iron based nano crystal material to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420705087.8U CN204290901U (en) | 2014-11-20 | 2014-11-20 | Signal filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420705087.8U CN204290901U (en) | 2014-11-20 | 2014-11-20 | Signal filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204290901U true CN204290901U (en) | 2015-04-22 |
Family
ID=52874027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420705087.8U Expired - Fee Related CN204290901U (en) | 2014-11-20 | 2014-11-20 | Signal filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204290901U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406736A (en) * | 2015-12-24 | 2016-03-16 | 益阳橡胶塑料机械集团有限公司 | Power supply circuit of PLC (Programmable Logic Controller) of internal mixer and anti-interference method thereof |
| CN110350532A (en) * | 2019-07-04 | 2019-10-18 | 深圳振华富电子有限公司 | Three-phase four-wire power filter |
| CN113937999A (en) * | 2021-10-13 | 2022-01-14 | 中国电子科技集团公司第五十四研究所 | Handheld multimode radio station and filter circuit for suppressing electromagnetic interference thereof |
-
2014
- 2014-11-20 CN CN201420705087.8U patent/CN204290901U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406736A (en) * | 2015-12-24 | 2016-03-16 | 益阳橡胶塑料机械集团有限公司 | Power supply circuit of PLC (Programmable Logic Controller) of internal mixer and anti-interference method thereof |
| CN105406736B (en) * | 2015-12-24 | 2018-11-09 | 益阳橡胶塑料机械集团有限公司 | The power circuit and anti-interference method of mixer PLC |
| CN110350532A (en) * | 2019-07-04 | 2019-10-18 | 深圳振华富电子有限公司 | Three-phase four-wire power filter |
| CN113937999A (en) * | 2021-10-13 | 2022-01-14 | 中国电子科技集团公司第五十四研究所 | Handheld multimode radio station and filter circuit for suppressing electromagnetic interference thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 |