CN212992293U - Wide frequency band power filter - Google Patents
Wide frequency band power filter Download PDFInfo
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- CN212992293U CN212992293U CN202022309124.1U CN202022309124U CN212992293U CN 212992293 U CN212992293 U CN 212992293U CN 202022309124 U CN202022309124 U CN 202022309124U CN 212992293 U CN212992293 U CN 212992293U
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Abstract
The utility model discloses a broadband power filter, including shell and cap, the cap forms with the shell and seals the appearance chamber together, seals to hold the intracavity and is equipped with one and will seal the intermediate bottom that holds the chamber and divide into two, is equipped with two wall-penetrating bolts in the intermediate bottom. The front stage filter circuit and the middle filter circuit are sequentially connected in the left cavity of the middle partition plate, and the rear stage filter circuit is arranged in the right cavity of the middle partition plate and is connected with the middle filter circuit through two wall-penetrating bolts. The front-stage filter circuit and the middle filter circuit are low-pass filter circuits, and the rear-stage filter circuit is a high-pass filter circuit. The utility model provides a broadband power filter's the filtering mode of adopting first high frequency filtering low frequency filtering again can effectively avoid high frequency interference to pass through radiation and coupling and bypass filter circuit, improves the filtering performance of wave filter greatly, reaches the effect of broadband effective filtering.
Description
Technical Field
The utility model relates to a power filter's technical field, in particular to broadband power filter.
Background
The power supply filter consists of an inductor, a capacitor and a resistor and is used for filtering signals in unwanted frequency bands in the power line and preventing the signals in the unwanted frequency bands from generating interference on equipment.
Most of the existing power filters on the market only have single-stage common mode or differential mode filtering, are simple in structure and single in material, do not carry out segmented filtering from a low-frequency band of dozens of KHz to a very high-frequency band of dozens of GHz, can only play a role in a certain narrow frequency band, and cannot be used in occasions requiring broadband interference suppression, such as an electromagnetic compatibility darkroom, a shielding room for a machine room, a secret room and the like.
SUMMERY OF THE UTILITY MODEL
The problem that exists to prior art, the utility model aims at providing a broadband power filter aims at solving power filter and can not have the occasion of high-efficient filtering in order to satisfy the needs broadband on the market, like the occasion that needs broadband interference suppression such as electromagnetic compatibility darkroom, computer lab with shielded room, secret room.
In order to achieve the above object, the present invention provides a broadband power filter, which includes a housing and a housing cover, wherein the housing cover covers the housing and forms a closed cavity together with the housing. The sealed cavity is internally provided with a middle partition plate which divides the sealed cavity into two parts, and the middle partition plate is internally provided with two wall-penetrating bolts.
Preceding stage filter circuit and intermediate filter circuit that connect gradually in intermediate bottom's the left side cavity, preceding stage filter circuit's two input end connectors are followed the left side of shell is worn out, and its output is connected with intermediate filter circuit's input.
And a rear-stage filter circuit is arranged in a right cavity of the middle partition plate, two input ends of the rear-stage filter circuit are connected with two output ends of the middle filter circuit through two wall-penetrating bolts, and two output end connectors of the rear-stage filter circuit penetrate out of the right side of the shell.
The front-stage filter circuit and the middle-stage filter circuit are low-pass filter circuits, and the rear-stage filter circuit is a high-pass filter circuit.
Optionally, the pre-filter circuit includes: feedthrough capacitors (C1, C2), an X capacitor Cx1, a resistor R1, and a common mode inductor LC 1.
The body of the feedthrough capacitor (C1, C2) is fixed on the shell through respective nuts, the first end of the feedthrough capacitor (C1, C2) penetrates out of the left side of the shell, the second end of the feedthrough capacitor (C1, C2) is connected with the first pin and the third pin of the common-mode inductor LC1, and the second end of the feedthrough capacitor (C1, C2) is connected with each other and grounded.
Two ends of the X capacitor Cx1 are respectively connected with the first pin and the third pin of the common-mode inductor LC1, and the resistor R1 is connected in parallel with two ends of the X capacitor Cx 1.
And a second pin and a fourth pin of the common mode inductor LC1 are used as output ends of the pre-filter circuit and are connected with the input end of the intermediate filter circuit.
Optionally, the core of the common mode inductor LC1 is a nickel-zinc-ferrite core, and the inductance thereof is 500 uH.
Optionally, the intermediate filter circuit comprises a Y capacitance (Cy 1, Cy2, Cy3, Cy 4), an X capacitance (Cx 2, Cx 3) and a common mode inductance LC 2.
The first pin and the third pin of the common-mode inductor LC2 are used as input ends of an intermediate filter and are connected with the output end of the pre-filter circuit, the first pin of the common-mode inductor LC2 is connected with the first end of a Y capacitor Cy1 and the first end of an X capacitor Cx2, the third pin of the common-mode inductor LC2 is connected with the first end of a Y capacitor Cy2 and the second end of the X capacitor Cx2, and the second end of the Y capacitor Cy1 and the second end of the Y capacitor Cy1 are connected and grounded.
The second pin and the fourth pin of the common-mode inductor LC2 are respectively connected with the input end of the pre-stage filter circuit through respective corresponding grounding screws, the second pin of the common-mode inductor LC2 is connected with the first end of a Y capacitor Cy3 and the first end of an X capacitor Cx3, the fourth pin of the common-mode inductor LC2 is connected with the first end of a Y capacitor Cy4 and the second end of the X capacitor Cx3, and the second end of the Y capacitor Cy3 is connected with the second end of the Y capacitor Cy4 and grounded.
Optionally, the magnetic core of the common mode inductor LC2 is made of an ultra-crystalline material, and the inductance of the common mode inductor LC2 is 10 mH.
Optionally, the post-stage filter circuit comprises differential mode inductors (LD 1, LD 2), an X capacitor Cx4, a resistor R2, and a feedthrough capacitor (C3, C4).
First pins of the differential mode inductors (LD 1 and LD 2) are respectively connected with the intermediate filter circuit through respective corresponding grounding screws, a second pin of the differential mode inductor LD1 is connected with a first end of an X capacitor Cx4 and a first end of a feedthrough capacitor C3, a second pin of the differential mode inductor LD2 is connected with a second end of the X capacitor Cx4 and a first end of the feedthrough capacitor C4, and a resistor R2 is connected in parallel at two ends of the X capacitor Cx 4.
The body of the feedthrough capacitor (C3, C4) is fixed on the shell through respective nuts, the second end of the feedthrough capacitor (C1, C2) penetrates out of the right side of the shell, and the second end of the feedthrough capacitor (C3, C4) is connected with each other and grounded.
Optionally, the magnetic core of the differential mode inductor (LD 1, LD 2) is a sendust magnetic core, and the inductance is 80 uH.
Optionally, a grounding bolt is fixed on the housing.
The utility model discloses a sub-band chooses for use corresponding device and specific circuit form to make up to reach the effect of broadband effective filtering, satisfy the occasion that needs the broadband to have high-efficient filtering on the market, need the occasion that broadband interference suppressed such as electromagnetic compatibility darkroom, computer lab with shielding room, secret room.
The utility model provides a filter circuit's of wave filter arrange according to earlier high frequency filtering, low frequency filtering's principle again, can effectively avoid high frequency interference through radiation and coupling and bypass filter circuit directly reachs the drawback of back level, improves the filtering performance of wave filter greatly.
And the intermediate partition board is arranged in the filter, so that high-frequency common-mode interference and low-frequency differential-mode interference can be effectively blocked, the high-frequency common-mode interference is prevented from reaching a post-stage filter circuit in a coupling mode, and the filtering effect of the filter on differential modes is improved.
Drawings
Fig. 1 is a schematic structural diagram of a wide band power filter according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of an embodiment of the broadband power filter of the present invention;
fig. 3 is a schematic block diagram of an embodiment of the broadband power filter of the present invention;
fig. 4 is a schematic circuit diagram of an embodiment of the broadband power filter of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to the attached drawings 1-3 in the specification, the embodiment of the present invention provides a broadband power filter, which includes a housing 1 and a housing cover 2, wherein the housing cover 2 covers the housing 1 and forms a closed cavity together with the housing 1. A middle partition plate 3 which divides the closed cavity into two parts is arranged in the closed cavity, the middle partition plate 3 divides the closed cavity into a left cavity and a right cavity, and two wall penetrating type bolts 31 are arranged in the middle partition plate 3.
Preceding stage filter circuit 4 and middle filter circuit 5 that connect gradually in the left side cavity of intermediate diaphragm 3, the two input end connectors of preceding stage filter circuit 4 wear out from the left side of shell 1, and its output is connected with the input of middle filter circuit 5.
The right cavity of the middle partition plate 3 is provided with a rear-stage filter circuit, two input ends of the rear-stage filter circuit are connected with two output ends of the middle filter circuit 5 through two wall-penetrating bolts 31, and two output end joints of the rear-stage filter circuit penetrate out of the right side of the shell 1.
The front-stage filter circuit 4 and the middle-stage filter circuit 5 are low-pass filter circuits, and the rear-stage filter circuit is a high-pass filter circuit.
The utility model discloses a sub-band chooses for use corresponding device and specific circuit form to make up to reach the effect of broadband effective filtering, satisfy the occasion that needs the broadband to have high-efficient filtering on the market, need the occasion that broadband interference suppressed such as electromagnetic compatibility darkroom, computer lab with shielding room, secret room.
The utility model provides a filter circuit's of wave filter arrange according to earlier high frequency filtering, low frequency filtering's principle again, can effectively avoid high frequency interference through radiation and coupling and bypass filter circuit directly reachs the drawback of back level, improves the filtering performance of wave filter greatly.
And the intermediate partition plate 3 is arranged in the filter, so that high-frequency common-mode interference and low-frequency differential-mode interference can be effectively blocked, the high-frequency common-mode interference is prevented from reaching a post-stage filter circuit in a coupling mode, and the filtering effect of the filter on differential modes is improved.
Alternatively, as shown in fig. 4, in the present embodiment, the pre-filter circuit 4 is an L-type common mode filter circuit formed by feedthrough capacitors (C1, C2), an X capacitor Cx1, a resistor R1, and a common mode inductor LC 1.
The body of the feedthrough capacitor (C1, C2) is fixed on the shell 1 through respective nuts, and the first end of the feedthrough capacitor (C1, C2) penetrates out of the left side of the shell 1 to be used as the unidirectional alternating current input end of the power filter. Second ends of the feedthrough capacitors (C1, C2) are respectively connected with the first pin and the third pin of the common-mode inductor LC1, and second ends of the feedthrough capacitors (C1, C2) are mutually connected and grounded.
Two ends of the X capacitor Cx1 are respectively connected with the first pin and the third pin of the common-mode inductor LC1, and the resistor R1 is connected in parallel with two ends of the X capacitor Cx 1.
The second pin and the fourth pin of the common mode inductor LC1 are used as the output end of the pre-filter circuit 4 and are connected with the input end of the intermediate filter circuit 5.
The magnetic core of the common mode inductor LC1 is a nickel-zinc ferrite magnetic core, the inductance value of the common mode inductor LC1 is 500uH, and the common mode inductor LC1 is used for restraining common mode interference of a high frequency band of 30 MHz-40 GHz.
Alternatively, as shown in fig. 4, in the present embodiment, the intermediate filter circuit 5 is a pi-type common mode filter circuit configured by Y capacitors (Cy 1, Cy2, Cy3, and Cy 4), X capacitors (Cx 2, and Cx 3), and a common mode inductor LC 2.
The first pin and the third pin of the common-mode inductor LC2 are used as input ends of the intermediate filter and are connected with the output end of the pre-filter circuit 4, the first pin of the common-mode inductor LC2 is connected with the first end of the Y capacitor Cy1 and the first end of the X capacitor Cx2, the third pin of the common-mode inductor LC2 is connected with the first end of the Y capacitor Cy2 and the second end of the X capacitor Cx2, and the second end of the Y capacitor Cy1 and the second end of the Y capacitor Cy1 are connected and grounded.
The second pin and the fourth pin of the common-mode inductor LC2 are respectively connected with the input end of the pre-stage filter circuit 4 through respective corresponding grounding screws, the second pin of the common-mode inductor LC2 is connected with the first end of the Y capacitor Cy3 and the first end of the X capacitor Cx3, the fourth pin of the common-mode inductor LC2 is connected with the first end of the Y capacitor Cy4 and the second end of the X capacitor Cx3, and the second end of the Y capacitor Cy3 and the second end of the Y capacitor Cy4 are connected and grounded.
Specifically, a magnetic core of the common mode inductor LC2 is made of an ultracrystalline material, the inductance value of the common mode inductor LC2 is 10mH, and the common mode inductor LC2 is used for inhibiting common mode interference of a middle frequency band of 10 MHz-100 MHz.
Optionally, as shown in fig. 4, in this embodiment, the post-stage filter circuit is an inverse L-type differential mode filter circuit formed by differential mode inductors (LD 1, LD 2), an X capacitor Cx4, a resistor R2, and feedthrough capacitors (C3, C4).
First pins of differential mode inductors (LD 1 and LD 2) are respectively connected with the intermediate filter circuit 5 through respective corresponding grounding screws, a second pin of the differential mode inductor LD1 is connected with a first end of an X capacitor Cx4 and a first end of a feedthrough capacitor C3, a second pin of the differential mode inductor LD2 is connected with a second end of the X capacitor Cx4 and a first end of the feedthrough capacitor C4, and a resistor R2 is connected in parallel with two ends of the X capacitor Cx 4.
The body of the feedthrough capacitor (C3, C4) is fixed on the shell 1 through respective nuts, and the second end of the feedthrough capacitor (C1, C2) penetrates out of the right side of the shell 1 to be used as the unidirectional alternating current input end of the power filter. The second ends of the feedthrough capacitors (C3, C4) are connected to each other and to ground.
Specifically, the magnetic cores of the differential mode inductors (LD 1 and LD 2) are iron-silicon-aluminum magnetic cores, the inductance value of the iron-silicon-aluminum magnetic cores is 80uH, and the iron-silicon-aluminum magnetic cores are used for inhibiting the differential mode interference of the low frequency band of 10 KHz-30 MHz.
In addition, in the present embodiment, a grounding bolt 7 is further fixed to the left side of the housing 1 for safe grounding.
When the filter works, single-phase alternating current is input from the first end of the feedthrough capacitors (C1, C2) on the left side of the shell 1, common mode interference of 30 MHz-40 GHz of a high frequency band entering the filter is filtered by the pre-filter circuit 4, common mode interference of 10 MHz-100 MHz of a middle frequency band is filtered by the middle filter, and common mode and differential mode interference of 10 KHz-30 MHz of the middle and low frequency bands are filtered by the post-filter. The filtering mode of firstly high frequency and then low frequency can well avoid high frequency interference to bypass the filter circuit through radiation and coupling, thereby greatly improving the filtering performance of the filter, effectively filtering interference signals in a wide frequency band, and further ensuring that the filter can meet the occasion that the wide frequency band is required to have high-efficiency filtering in the market.
The above is only the preferred embodiment of the present invention, not used in the present invention, and any slight modifications, equivalent replacements and improvements made by the technical entity of the present invention to the above embodiments should be included in the protection scope of the technical solution of the present invention.
Claims (8)
1. A broadband power filter comprises a shell and a shell cover, wherein the shell cover is covered on the shell in a sealing mode and forms a sealed cavity together with the shell;
the front-stage filter circuit and the middle filter circuit are sequentially connected in the left cavity of the middle partition plate, two input end connectors of the front-stage filter circuit penetrate out of the left side of the shell, and the output end of the front-stage filter circuit is connected with the input end of the middle filter circuit;
a cavity on the right side of the middle partition plate is provided with a rear-stage filter circuit, two input ends of the rear-stage filter circuit are connected with two output ends of the middle filter circuit through two wall-penetrating bolts, and two output end connectors of the rear-stage filter circuit penetrate out of the right side of the shell;
the front-stage filter circuit and the middle-stage filter circuit are low-pass filter circuits, and the rear-stage filter circuit is a high-pass filter circuit.
2. The wideband power filter according to claim 1, wherein said pre-filter circuit comprises: feedthrough capacitors (C1, C2), an X capacitor Cx1, a resistor R1, and a common mode inductor LC 1;
the body of the feedthrough capacitor (C1, C2) is fixed on the shell through respective nuts, the first end of the feedthrough capacitor (C1, C2) penetrates out of the left side of the shell, the second end of the feedthrough capacitor (C1, C2) is connected with the first pin and the third pin of the common-mode inductor LC1, and the second end of the feedthrough capacitor (C1, C2) is connected with each other and grounded;
two ends of the X capacitor Cx1 are respectively connected with a first pin and a third pin of the common-mode inductor LC1, and the resistor R1 is connected in parallel with two ends of the X capacitor Cx 1;
and a second pin and a fourth pin of the common mode inductor LC1 are used as output ends of the pre-filter circuit and are connected with the input end of the intermediate filter circuit.
3. The broadband power filter according to claim 2, wherein the core of the common mode inductor LC1 is a nickel-zinc-ferrite core with an inductance of 500 uH.
4. The broadband power filter according to claim 1, wherein the intermediate filter circuit comprises a Y capacitance (Cy 1, Cy2, Cy3, Cy 4), an X capacitance (Cx 2, Cx 3), and a common mode inductance LC 2;
the first pin and the third pin of the common-mode inductor LC2 are used as input ends of an intermediate filter and are connected with the output end of the pre-filter circuit, the first pin of the common-mode inductor LC2 is connected with the first end of a Y capacitor Cy1 and the first end of an X capacitor Cx2, the third pin of the common-mode inductor LC2 is connected with the first end of a Y capacitor Cy2 and the second end of the X capacitor Cx2, and the second end of the Y capacitor Cy1 and the second end of the Y capacitor Cy1 are connected and grounded;
the second pin and the fourth pin of the common-mode inductor LC2 are respectively connected with the input end of the pre-stage filter circuit through respective corresponding grounding screws, the second pin of the common-mode inductor LC2 is connected with the first end of a Y capacitor Cy3 and the first end of an X capacitor Cx3, the fourth pin of the common-mode inductor LC2 is connected with the first end of a Y capacitor Cy4 and the second end of the X capacitor Cx3, and the second end of the Y capacitor Cy3 is connected with the second end of the Y capacitor Cy4 and grounded.
5. The broadband power filter according to claim 4, wherein the core of the common mode inductor LC2 is made of an ultra-crystalline material and has an inductance of 10 mH.
6. The broadband power filter according to claim 1, wherein the post-stage filter circuit comprises a differential mode inductor (LD 1, LD 2), an X capacitor Cx4, a resistor R2, and a feedthrough capacitor (C3, C4);
first pins of the differential mode inductors (LD 1 and LD 2) are respectively connected with the intermediate filter circuit through respective corresponding grounding screws, a second pin of the differential mode inductor LD1 is connected with a first end of an X capacitor Cx4 and a first end of a feedthrough capacitor C3, a second pin of the differential mode inductor LD2 is connected with a second end of an X capacitor Cx4 and a first end of a feedthrough capacitor C4, and a resistor R2 is connected in parallel with two ends of the X capacitor Cx 4;
the body of the feedthrough capacitor (C3, C4) is fixed on the shell through respective nuts, the second end of the feedthrough capacitor (C1, C2) penetrates out of the right side of the shell, and the second end of the feedthrough capacitor (C3, C4) is connected with each other and grounded.
7. The broadband power filter according to claim 6, wherein the core of the differential mode inductor (LD 1, LD 2) is a sendust core, and the inductance thereof is 80 uH.
8. The broadband power filter according to any one of claims 1 to 7, wherein a ground bolt is fixed to the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022309124.1U CN212992293U (en) | 2020-10-16 | 2020-10-16 | Wide frequency band power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022309124.1U CN212992293U (en) | 2020-10-16 | 2020-10-16 | Wide frequency band power filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212992293U true CN212992293U (en) | 2021-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022309124.1U Active CN212992293U (en) | 2020-10-16 | 2020-10-16 | Wide frequency band power filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212992293U (en) |
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2020
- 2020-10-16 CN CN202022309124.1U patent/CN212992293U/en active Active
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