CN113904537A

CN113904537A - Mixed signal aviation EMC wave filter

Info

Publication number: CN113904537A
Application number: CN202111258615.0A
Authority: CN
Inventors: 史飞鹏; 黄光炎; 谢双星
Original assignee: Guiyang Aviation Electrical Machinery Co Ltd
Current assignee: Guiyang Aviation Electrical Machinery Co Ltd
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-01-07

Abstract

The invention discloses a road mixed signal aviation EMC filter which comprises a shell, wherein the shell consists of a first cavity, a second cavity and a third cavity, the first cavity, the second cavity and the third cavity are sequentially arranged side by side, a lightning protection device is arranged on one side of the first cavity, and a magnetic ring assembly is embedded in the outer wall of the first cavity. According to the aerial EMC filter for the mixed signals of the circuit, the shell is designed by adopting a cavity-splitting structure through the first cavity, the second cavity and the third cavity, so that internal crosstalk of the EMC filter is reduced to the maximum extent; through 3 way 28V DC power supply, 115V 400Hz three-phase AC power supply, communication signal and a plurality of filter assembly common operation in magnetic ring subassembly and the casing, can effectively filtering low frequency interference, adopt impulse current suppression circuit, effectively protect back level circuit, do not influence 115V 400Hz three-phase AC power supply normal work, through common mode capacitance filtering high frequency interference, do not influence communication signal normal work simultaneously.

Description

Mixed signal aviation EMC wave filter

Technical Field

The invention relates to the technical field of filters, in particular to a mixed signal aviation EMC filter.

Background

The filter is a filter circuit consisting of a capacitor, an inductor and a resistor. The filter can effectively filter the frequency point of the specific frequency in the power line or the frequencies except the frequency point to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency. The EMC filter is specifically an EMC filter with 39 paths of mixed signals of 115V/400Hz three-phase alternating-current power supply, 28V direct-current power supply, communication signals, discrete signals, ground/open signals and the like.

The aviation control protector is required to pass the electromagnetic compatibility test, and the inside many interference that exist of control protector influences other products, and other products also have many interference influence control protector, so need an EMC wave filter to absorb the interference, guarantee control protector and other products normal work.

Disclosure of Invention

In order to solve the technical problems, the invention provides the following technical scheme:

the invention discloses a mixed signal aviation EMC filter which comprises a shell, wherein the shell consists of a first cavity, a second cavity and a third cavity, the first cavity, the second cavity and the third cavity are sequentially arranged side by side, a lightning protection device is arranged on one side of the first cavity, and a magnetic ring assembly is embedded in the outer wall of the first cavity.

As a preferred technical scheme of the invention, the shell body of the shell is manufactured by integral milling, the corners of the shell body are designed to be in a circular arc structure, and the opening of the shell body is protected by a sealing cover plate.

As a preferred technical scheme of the present invention, the first chamber is smaller than the second chamber and the third chamber, the first chamber, the second chamber and the third chamber adopt a cavity-divided structural design, and the lightning protection device is provided with a bolt and is fixed with the outer wall of the first chamber through a thread.

As a preferable technical scheme of the invention, the magnetic ring assemblies comprise three groups of nanocrystalline magnetic rings, manganese-zinc magnetic rings and magnetic beads, and the magnetic ring assemblies are respectively arranged on the outer walls of the first chamber, the second chamber and the third chamber in a penetrating manner.

As a preferred technical scheme of the invention, a 3-path 28V direct-current power supply, a 115V/400Hz three-phase alternating-current power supply, a communication signal and a plurality of filtering components are arranged in the shell.

As a preferred technical scheme of the invention, the 3-path 28V direct-current power supply adopts a 2-stage filter circuit, the common-mode inductance magnetic ring selects a nanocrystalline magnetic ring with initial magnetic conductivity of 60000-120000 mu 0, the leakage inductance of the nanocrystalline magnetic ring is differential-mode inductance, and an impulse current suppression circuit is arranged.

As a preferred technical scheme of the invention, the 115V/400Hz three-phase alternating current power supply adopts a 1-stage filter circuit, the common mode inductance magnetic ring adopts a manganese-zinc magnetic ring with the initial magnetic conductivity of 10000 mu 0, and the leakage inductance of the common mode inductance magnetic ring is differential mode inductance.

As a preferred technical scheme of the invention, the communication signal adopts a 1-stage filter circuit, the magnetic ring of the common mode inductor adopts a manganese-zinc magnetic ring with the initial magnetic conductivity of 10000 mu 0, the leakage inductance of the manganese-zinc magnetic ring is a differential mode inductor, and the rest signals are connected with a common mode capacitor and magnetic beads.

The invention has the beneficial effects that:

1. according to the mixed signal aviation EMC filter, the shell is designed by adopting a cavity-splitting structure through the first cavity, the second cavity and the third cavity, so that internal crosstalk of the EMC filter is reduced to the maximum extent;

2. this kind of mixed signal aviation EMC wave filter, through 3 way 28V DC power supply in magnetic ring subassembly and the casing, 115V 400Hz three-phase AC power supply, communication signal and a plurality of filtering component function jointly, can effectively filter low frequency interference, adopt impulse current suppression circuit, effectively protect back stage circuit, do not influence 115V 400Hz three-phase AC power supply normal work, through common mode capacitance filtering high frequency interference, do not influence communication signal normal work simultaneously.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic block diagram of a mixed signal airborne EMC filter of the present invention;

FIG. 2 is a block diagram of a mixed signal aircraft EMC filter according to the present invention;

FIG. 3 is an enlarged view of the upper half of the schematic block diagram of a mixed signal avionic EMC filter of the present invention;

FIG. 4 is an enlarged view of the middle portion of the schematic block diagram of a mixed signal aviation EMC filter of the present invention;

fig. 5 is an enlarged view of the lower half of the schematic block diagram of a mixed signal avionic EMC filter according to the invention.

In the figure: 1. a housing; 2. a first chamber; 3. a second chamber; 4. a third chamber; 5. a lightning protection device; 6. a magnetic ring assembly.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Example (b): as shown in fig. 1-5, the aviation EMC filter for mixed signals of the invention includes a housing 1, the housing 1 is composed of a first chamber 2, a second chamber 3 and a third chamber 4, the first chamber 2, the second chamber 3 and the third chamber 4 are sequentially arranged side by side, a lightning protection device 5 is installed on one side of the first chamber 2, and a magnetic ring assembly 6 is embedded on the outer wall of the first chamber 2.

Wherein, 1 casing of casing adopts whole milling process to make, and 1 corner of casing is the circular arc structural design, and 1 opening part of casing is equipped with sealed apron protection, improves EMC wave filter shielding performance.

Wherein, first cavity 2 is less than second cavity 3 and third cavity 4, and first cavity 2, second cavity 3 and third cavity 4 adopt and divide the cavity structural design, and lightning protection device 5 is equipped with bolt and 2 outer wall thread tightening of first cavity, adopts and divides the cavity structural design, furthest's reduction EMC wave filter internal crosstalk.

The magnetic ring assembly 6 comprises a nanocrystalline magnetic ring, a manganese-zinc magnetic ring and magnetic beads, the magnetic ring assembly 6 is provided with three groups, the magnetic ring assembly 6 is respectively installed on the outer walls of the first chamber 2, the second chamber 3 and the third chamber 4 in a penetrating mode, and the magnetic ring assembly 6 is used for effectively filtering low-frequency interference.

Wherein, the inside of the shell 1 is provided with a 3-path 28V direct current power supply, a 115V/400Hz three-phase alternating current power supply, a communication signal and a plurality of filter components.

The 3-path 28V direct-current power supply adopts a 2-stage filter circuit, the common-mode inductance magnetic ring selects a nanocrystalline magnetic ring with initial permeability of 60000-120000 mu 0, the leakage inductance of the nanocrystalline magnetic ring is differential-mode inductance, an impact current suppression circuit is arranged, low-frequency interference can be effectively filtered, and the impact current suppression circuit is adopted to effectively protect a rear-stage circuit.

The 115V/400Hz three-phase alternating current power supply adopts a 1-level filter circuit, the common mode inductance magnetic ring adopts a manganese-zinc magnetic ring with the initial magnetic conductivity of 10000 mu 0, and the leakage inductance of the common mode inductance magnetic ring is differential mode inductance, so that low-frequency interference can be effectively filtered, and the normal work of the 115V/400Hz three-phase alternating current power supply is not influenced.

Wherein, the communication signal adopts a 1-level filter circuit, and the magnetic ring of the common mode inductor adopts the initial magnetic conductivity of 10000 mu₀The leakage inductance of the manganese-zinc magnetic ring is a differential mode inductance, and other signals are connected with a common mode capacitor and magnetic beads, so that low-frequency interference can be effectively filtered, high-frequency interference can be filtered through the common mode capacitor, and meanwhile, the normal work of communication signals is not influenced.

The working principle is as follows: the shell 1 is designed by adopting a cavity-splitting structure through the first cavity 2, the second cavity 3 and the third cavity 4, so that the internal crosstalk of the EMC filter is reduced to the maximum extent; through 3 way 28V DC power supply in magnetic ring subassembly 6 and casing 1, 115V 400Hz three-phase AC power supply, communication signal and a plurality of filter subassembly work jointly, can effectively filter low frequency interference, adopt impulse current suppression circuit, effectively protect the back stage circuit, do not influence 115V 400Hz three-phase AC power supply normal work, filter high frequency interference through common mode capacitance, do not influence communication signal normal work simultaneously, adopt the design of dividing the chamber structure, multistage filter design, impulse current suppression design, lightning protection design etc. during the concrete implementation, design concrete circuit according to the principle block diagram shown in figure 1, carry out parameter adjustment according to actual requirement.

Finally, it should be noted that: in the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a mixed signal aviation EMC wave filter, includes casing (1), its characterized in that, casing (1) comprises first cavity (2), second cavity (3) and third cavity (4), first cavity (2), second cavity (3) and third cavity (4) set up side by side in proper order, lightning protection device (5) are installed to first cavity (2) one side, first cavity (2) outer wall inlays and is equipped with magnetic ring subassembly (6).

2. The mixed signal aviation EMC filter of claim 1, wherein the shell (1) is manufactured by integral milling, corners of the shell (1) are designed to be in a circular arc structure, and a sealing cover plate is arranged at an opening of the shell (1) for protection.

3. The mixed signal aviation EMC filter of claim 1, wherein the first chamber (2) is smaller than the second chamber (3) and the third chamber (4), the first chamber (2), the second chamber (3) and the third chamber (4) are designed in a cavity-divided structure, and the lightning protection device (5) is provided with bolts to be fixed with the outer wall of the first chamber (2) in a threaded manner.

4. The mixed signal aviation EMC filter of claim 1, wherein the magnetic ring assemblies (6) are composed of a nanocrystalline magnetic ring, a manganese-zinc magnetic ring and magnetic beads, three groups of magnetic ring assemblies (6) are provided, and the magnetic ring assemblies (6) are respectively installed on the outer walls of the first chamber (2), the second chamber (3) and the third chamber (4) in a penetrating mode.

5. The mixed-signal aircraft EMC filter according to claim 1, characterized in that inside said casing (1) there are provided 3 direct current sources of 28V, 115V/400Hz three-phase alternating current, communication signals and several filtering components.

6. The mixed signal aviation EMC filter of claim 5, wherein the 3-path 28V DC power supply adopts a 2-stage filter circuit, the common-mode inductor magnetically selects a nanocrystalline magnetic ring with initial permeability of 60000-120000 μ 0, the leakage inductance of the nanocrystalline magnetic ring is differential-mode inductance, and an impulse current suppression circuit is arranged.

7. The mixed signal aviation EMC filter of claim 5, wherein the 115V/400Hz three-phase AC power supply adopts a 1-stage filter circuit, the common mode inductance magnetic ring adopts a Mn-Zn magnetic ring with an initial permeability of 10000 μ 0, and the leakage inductance of the Mn-Zn magnetic ring is a differential mode inductance.

8. The mixed signal aviation EMC filter of claim 5, wherein the communication signal employs a class 1 filter circuit, the magnetic ring of the common mode inductor is a Mn-Zn magnetic ring with an initial permeability of 10000 μ 0, the leakage inductance is a differential mode inductor, and the rest signals are connected with a common mode capacitor and a magnetic bead.