CN204539097U - A kind of noise reduction filtering circuit for pi type filter and a kind of pi type filter - Google Patents
A kind of noise reduction filtering circuit for pi type filter and a kind of pi type filter Download PDFInfo
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- CN204539097U CN204539097U CN201520103863.1U CN201520103863U CN204539097U CN 204539097 U CN204539097 U CN 204539097U CN 201520103863 U CN201520103863 U CN 201520103863U CN 204539097 U CN204539097 U CN 204539097U
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- 230000009467 reduction Effects 0.000 title claims abstract description 19
- 238000001914 filtration Methods 0.000 title claims abstract description 18
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model provides a kind of noise reduction filtering circuit for pi type filter, comprise the first inductance and the second inductance that are connected in parallel, the first end of described first inductance and the first end of described second inductance form the first circuit connecting end, second end of described first inductance and the second end of described second inductance form second circuit link, also comprise the first electric capacity and the second electric capacity, the two ends of described first electric capacity are attempted by the first end of the first inductance and the first end of described second inductance respectively, the two ends of described second electric capacity are attempted by the second end of the first inductance and the second end of described second inductance respectively.The utility model additionally provides a kind of pi type filter comprising technique scheme.The beneficial effect of noise reduction filtering circuit of the present utility model is the coefficient of mutual inductance reducing input and output electric capacity, greatly improves the performance of whole noise reduction filtering circuit during high frequency.
Description
Technical field
The utility model relates to filter field, particularly a kind of noise reduction filtering circuit for pi type filter and a kind of pi type filter.
Background technology
At present, the filter circuit of common pi type filter comprises CRC filter circuit (as shown in Figure 1) and CLC filter circuit (as shown in Figure 2) two kinds.And CRC filter circuit is made up of two electric capacity C1, C2 and a resistance R1, its resistance R1 in the course of the work will consume some energy, and therefore effect is not as CLC filter circuit.CLC filter circuit is made up of two electric capacity C1, C2 and an inductance L 1, is a kind of low pass filter, and it can allow low frequency signal pass through, and has inhibitory action to High-frequency Interference.But along with noise frequency is increased to a certain degree, filter circuit will be deteriorated to the inhibition of noise, and noise also can increase thereupon.In addition, when experimental result shows that the coefficient of mutual inductance when between input and output electric capacity reduces, the performance of filter can improve, but the coefficient of mutual inductance between the input and output electric capacity of current filter circuit is bigger than normal.
Utility model content
One of the purpose of this utility model is deficiency for existing pi type filter filter circuit and defect, and provide a kind of noise reduction filtering circuit for pi type filter, two of the purpose of this utility model is to provide a kind of pi type filter, to solve the problem.
The technical problem that the utility model solves can realize by the following technical solutions:
A kind of noise reduction filtering circuit for pi type filter, it is characterized in that, comprise the first inductance and the second inductance that are connected in parallel, the first end of described first inductance and the first end of described second inductance form the first circuit connecting end, second end of described first inductance and the second end of described second inductance form second circuit link, also comprise the first electric capacity and the second electric capacity, the two ends of described first electric capacity are attempted by the first end of the first inductance and the first end of described second inductance respectively, the two ends of described second electric capacity are attempted by the second end of the first inductance and the second end of described second inductance respectively.
A kind of pi type filter, it is characterized in that, this pi type filter comprises a kind of noise reduction filtering circuit for pi type filter of as above technical scheme.
Owing to have employed technical scheme as above, the beneficial effect of noise reduction filtering circuit of the present utility model is the coefficient of mutual inductance reducing input and output electric capacity, greatly improves the performance of whole noise reduction filtering circuit during high frequency.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of the CRC filter circuit of current pi type filter.
Fig. 2 is the circuit theory diagrams of the CLC filter circuit of current pi type filter.
Fig. 3 is the circuit theory diagrams of a kind of noise reduction filtering circuit for pi type filter of the utility model.
Fig. 4 is the performance curve schematic diagram between the frequency of a kind of noise reduction filtering circuit for pi type filter of the utility model and noise reduction, wherein, Original M3 in this figure is the performance curve of the filter circuit of common pi type filter, and Smaller M3 is the performance curve of filter circuit of the present utility model.
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect is easy to understand, setting forth the utility model further below.
A kind of noise reduction filtering circuit for pi type filter shown in Figure 3, comprise the first inductance L 1 and the second inductance L 2 be connected in parallel, the first end L1-1 of the first inductance L 1 and first end L2-1 of the second inductance L 2 forms the first circuit connecting end, second end L1-2 of the first inductance L 1 and the second end L2-2 of the second inductance L 2 forms second circuit link, the two ends of the first electric capacity C1 are attempted by the first end L1-1 of the first inductance L 1 and first end L2-1 of described second inductance L 2 respectively, the two ends of the second electric capacity C2 are attempted by the second end L1-2 of the first inductance L 1 and the second end L2-2 of the second inductance L 2 respectively.
Operation principle of the present utility model is as follows:
When have in an electric capacity noise current by time will produce the capacity coupled magnetic flux with another one and carry out restraint speckle.Although this coupling is very faint, after being through certain number of times, it just can be equal to the difference current between two electric capacity.The effect that the equivalent inductance of this coupling ratio capacitance inside when high frequency produces is more important.The induced noise voltage of electric capacity is added directly in the output loop of filter in addition, and this just makes noise when high frequency by inductive branch.So the utility model reduces the coefficient of mutual inductance of input and output electric capacity, during high frequency, greatly improve the performance of whole noise reduction filtering circuit.Shown in Figure 4, allow identical noise by the filter circuit of common pi type filter and filter circuit of the present utility model, obviously can find out that filter circuit of the present utility model is better to noise suppression effect when same frequency.
Comprise the pi type filter of above-mentioned a kind of noise reduction filtering circuit for pi type filter, it can imitate suppression electric network noise, improves antijamming capability and the reliability of electronic instrument, computer and TT&C system.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (2)
1. the noise reduction filtering circuit for pi type filter, it is characterized in that, comprise the first inductance and the second inductance that are connected in parallel, the first end of described first inductance and the first end of described second inductance form the first circuit connecting end, second end of described first inductance and the second end of described second inductance form second circuit link, also comprise the first electric capacity and the second electric capacity, the two ends of described first electric capacity are attempted by the first end of the first inductance and the first end of described second inductance respectively, the two ends of described second electric capacity are attempted by the second end of the first inductance and the second end of described second inductance respectively.
2. a pi type filter, is characterized in that, this pi type filter comprises a kind of noise reduction filtering circuit for pi type filter as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520103863.1U CN204539097U (en) | 2015-02-12 | 2015-02-12 | A kind of noise reduction filtering circuit for pi type filter and a kind of pi type filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520103863.1U CN204539097U (en) | 2015-02-12 | 2015-02-12 | A kind of noise reduction filtering circuit for pi type filter and a kind of pi type filter |
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| Publication Number | Publication Date |
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| CN204539097U true CN204539097U (en) | 2015-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520103863.1U Expired - Fee Related CN204539097U (en) | 2015-02-12 | 2015-02-12 | A kind of noise reduction filtering circuit for pi type filter and a kind of pi type filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106961256A (en) * | 2017-03-29 | 2017-07-18 | 中国电力科学研究院 | A kind of equipment and carrier wave platform for being filtered is separated from test system |
| CN106981974A (en) * | 2017-04-05 | 2017-07-25 | 延锋伟世通电子科技（上海）有限公司 | A kind of vehicle power interface circuit for suppressing engine noise |
| EP3764748A1 (en) * | 2019-07-12 | 2021-01-13 | Goodrich Corporation | Pulse phase modulation based dc-dc converter with adjustable current control drive |
-
2015
- 2015-02-12 CN CN201520103863.1U patent/CN204539097U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106961256A (en) * | 2017-03-29 | 2017-07-18 | 中国电力科学研究院 | A kind of equipment and carrier wave platform for being filtered is separated from test system |
| CN106981974A (en) * | 2017-04-05 | 2017-07-25 | 延锋伟世通电子科技（上海）有限公司 | A kind of vehicle power interface circuit for suppressing engine noise |
| EP3764748A1 (en) * | 2019-07-12 | 2021-01-13 | Goodrich Corporation | Pulse phase modulation based dc-dc converter with adjustable current control drive |
| US10999910B2 (en) | 2019-07-12 | 2021-05-04 | Goodrich Corporation | Pulse phase modulation based DC-DC converter with adjustable current control drive |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150805 |