CN214154465U - Pi-type filter - Google Patents
Pi-type filter Download PDFInfo
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- CN214154465U CN214154465U CN202120172688.7U CN202120172688U CN214154465U CN 214154465 U CN214154465 U CN 214154465U CN 202120172688 U CN202120172688 U CN 202120172688U CN 214154465 U CN214154465 U CN 214154465U
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- film capacitor
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- filter
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Abstract
The utility model discloses a pi-type filter, which comprises a shell, a filter body arranged in the shell and pins arranged on the shell, wherein the filter body comprises a magnetic core, and a first magnetic column and a second magnetic column are arranged on the magnetic core at intervals; the first coil is wound on the first magnetic column, and two ends of the first coil are respectively connected with a pin; the second coil is wound on the second magnetic column, and two ends of the second coil are respectively connected with a pin; the first thin film capacitor is sleeved on the outer ring of the first coil, and one end of the first thin film capacitor is connected with one end of the first coil and one end of the second coil respectively; the second thin film capacitor is sleeved on the outer ring of the second coil, and the other end of the second thin film capacitor is connected with the other end of the first coil and the other end of the second coil respectively; through being provided with the magnetic core and reducing magnetic field stack interference, can solve EMC conduction problem, original six connect and reduce into four and connect, improved the integrated level, make the volume of wave filter littleer.
Description
Technical Field
The utility model relates to a wave filter field, in particular to pi type wave filter.
Background
The passive filter is a filter circuit formed by resistors, reactors and capacitor components, and the passive filter is a pi-type filter wired in a pi-type mode.
The filter circuit of the existing pi-type filter comprises two X capacitors and a common-mode inductor to form an independent circuit, 3 devices are required to be connected to a circuit board, 6 interfaces are required, the installation is inconvenient, the space is occupied, the integration level is low, the circuit board is difficult to wire, the noise reduction effect is general, meanwhile, each component of the circuit can generate performance fluctuation and further generate common-mode interference when the component runs for a long time, the normal operation of the filter circuit is influenced, in addition, because an independent electronic component cannot be formed, the protection of the electronic component cannot be guaranteed, and the electronic component is easy to damage.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a pi type filter.
The utility model discloses a technical scheme that its technical problem was solved to an embodiment adopted is: the utility model provides a pi type filter, includes the shell, sets up the filter body in the shell and sets up the pin on the shell, the filter body includes:
the magnetic core is provided with a first magnetic column and a second magnetic column at intervals;
the first coil is wound on the first magnetic column, and two ends of the first coil are respectively connected with a pin;
the second coil is wound on the second magnetic column, and two ends of the second coil are respectively connected with a pin;
the first thin film capacitor is sleeved on the outer ring of the first coil, one end of the first thin film capacitor is respectively connected with one end of the first coil and one end of the second coil, and a first insulating layer is arranged between the first thin film capacitor and the first coil;
the second film capacitor is sleeved on the outer ring of the second coil, the other end of the second film capacitor is connected with the other end of the first coil and the other end of the second coil respectively, and a second insulating layer is arranged between the second film capacitor and the second coil.
Further, the number of turns and winding direction of the first coil are the same.
Furthermore, the first coil and the second coil are respectively wound on the first magnetic column and the second magnetic column in a single layer.
Further, the inductance values of the first coil and the second coil were set to 5-20 MH.
The utility model has the advantages that: a pi-type filter comprises a shell, a filter body arranged in the shell and pins arranged on the shell, wherein the filter body comprises a magnetic core, and a first magnetic column and a second magnetic column are arranged on the magnetic core at intervals; the first coil is wound on the first magnetic column, and two ends of the first coil are respectively connected with a pin; the second coil is wound on the second magnetic column, and two ends of the second coil are respectively connected with a pin; the first thin film capacitor is sleeved on the outer ring of the first coil, and one end of the first thin film capacitor is connected with one end of the first coil and one end of the second coil respectively; the second thin film capacitor is sleeved on the outer ring of the second coil, and the other end of the second thin film capacitor is connected with the other end of the first coil and the other end of the second coil respectively; through being provided with the magnetic core and reducing magnetic field stack interference, can solve EMC conduction problem, original six connect and reduce into four and connect, improved the integrated level, make the volume of wave filter littleer.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a pi filter;
FIG. 2 is a schematic circuit diagram of a pi filter;
fig. 3 is a top view of a pi filter.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
In the description of the present invention, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as excluding the number, and the terms greater than, less than, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly defined, the terms "set," "mounted," "connected," and the like are to be understood in a broad sense, and may be directly connected or indirectly connected through an intermediate medium, for example; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be a mechanical connection; either as communication within the two elements or as an interactive relationship of the two elements. The technical skill in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.
Referring to fig. 1 to 3, a pi-type filter includes a housing 10, a filter body disposed in the housing 10, and a pin 20 disposed on the housing 10, the filter body including:
a magnetic core 30 on which a first magnetic pillar 31 and a second magnetic pillar 32 are arranged at an interval;
a first coil 41 wound around the first magnetic pillar 31, wherein two ends of the first coil are respectively connected with a pin 20;
a second coil 42 wound on the second magnetic pillar 32, and two ends of the second coil are respectively connected with one pin 20;
a first thin film capacitor 51 sleeved on the outer ring of the first coil 41, wherein one end of the first thin film capacitor 51 is connected to one end of the first coil 41 and one end of the second coil 42, respectively, and a first insulating layer 61 is arranged between the first thin film capacitor 51 and the first coil 41;
a second thin film capacitor 52 sleeved on the outer ring of the second coil 42, wherein the other end of the second thin film capacitor 52 is connected with the other end of the first coil 41 and the other end of the second coil 42 respectively, and a second insulating layer 62 is arranged between the second thin film capacitor 52 and the second coil 42; referring to fig. 2, which is a schematic circuit diagram of the present application, the coil, the thin film capacitor and the pins are wired in a solid body according to the circuit diagram shown in fig. 2.
The utility model integrates the first coil 41, the second coil 42, the first film capacitor 51 and the second film capacitor 52 by the magnetic core 30 to achieve the purpose of good noise reduction effect, high integration level and convenient production, reduces magnetic field superposition interference by the magnetic core 30 to solve the problem of EMC conduction, reduces original six pins 20 to four pins 20 by the addition of the magnetic core 30, has the advantages of convenient installation, space occupation reduction, high integration level, easy circuit board wiring and good noise reduction effect, simultaneously, each component of the circuit can not generate performance fluctuation and further generate common mode interference when operating for a long time, thereby influencing the normal operation of the filter circuit, being convenient for factory standardized operation, improving the production efficiency, reducing the production cost, when in electrification, two inductance coils form common mode inductance through the magnetic core, and effectively filtering common mode electromagnetic interference signals, the electromagnetic conversion is strengthened, the thin film capacitor which is packaged in advance forms a series circuit with a coil through two polar plates on the outer surface of the thin film capacitor, the use space is further reduced, and the integration level is improved.
The utility model discloses a set up shell 10 and reach the purpose of carrying out buffering protection to magnetic core 30, coil and film capacitor, wrap up around the wave filter body closely through the shell that rubber was made for the wave filter body can effectively be protected when dropping the ground, has also protected the safety that is located the inside filter circuit of shell simultaneously, and please itself have the strong advantage of protectiveness for prior art.
The first coil 41 has the same number of turns and winding direction.
The first coil 41 and the second coil 42 are respectively wound on the first magnetic pillar 31 and the second magnetic pillar 32 in a single layer.
The inductance values of the first coil 41 and the second coil 42 are set to 5-20 MH.
Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications and substitutions are included in the scope defined by the claims of the present application.
Claims (4)
1. A pi-type filter comprising a housing (10), a filter body disposed within the housing (10), and a pin (20) disposed on the housing (10), characterized in that the filter body comprises:
a magnetic core (30) on which a first magnetic column (31) and a second magnetic column (32) are arranged at intervals;
the first coil (41) is wound on the first magnetic column (31), and two ends of the first coil are respectively connected with one pin (20);
the second coil (42) is wound on the second magnetic column (32), and two ends of the second coil are respectively connected with one pin (20);
the first thin film capacitor (51) is sleeved on the outer ring of the first coil (41), one end of the first thin film capacitor (51) is respectively connected with one end of the first coil (41) and one end of the second coil (42), and a first insulating layer (61) is arranged between the first thin film capacitor (51) and the first coil (41);
the second thin film capacitor (52) is sleeved on the outer ring of the second coil (42), the other end of the second thin film capacitor (52) is connected with the other end of the first coil (41) and the other end of the second coil (42) respectively, and a second insulating layer (62) is arranged between the second thin film capacitor (52) and the second coil (42).
2. A pi filter as claimed in claim 1, wherein: the number of turns and winding direction of the first coil (41) are the same.
3. A pi filter as claimed in claim 1, wherein: the first coil (41) and the second coil (42) are respectively wound on the first magnetic column (31) and the second magnetic column (32) in a single layer.
4. A pi filter as claimed in claim 1, wherein: the inductance values of the first coil (41) and the second coil (42) are set to 5-20 MH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120172688.7U CN214154465U (en) | 2021-01-21 | 2021-01-21 | Pi-type filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120172688.7U CN214154465U (en) | 2021-01-21 | 2021-01-21 | Pi-type filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214154465U true CN214154465U (en) | 2021-09-07 |
Family
ID=77548633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120172688.7U Active CN214154465U (en) | 2021-01-21 | 2021-01-21 | Pi-type filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214154465U (en) |
-
2021
- 2021-01-21 CN CN202120172688.7U patent/CN214154465U/en active Active
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