An integrated feedthrough filter

Abstract

The utility model discloses an integrated feedthrough filter, a plurality of filter circuit modules are arranged in the cavity of metal casing in annular matrix, and the filter circuit module includes inductance coil, through -capacitor and connecting terminal, and the both sides of inductance coil are equipped with first end and second end, and the first end of inductance coil is connected with first through -capacitor through connecting terminal, and the second end of inductance coil is connected with second through -capacitor through connecting terminal, the isolation piece is arranged between adjacent filter circuit module, and the isolation piece is fixedly installed on the inner wall of metal casing. The utility model has the advantages that: a plurality of independent filter circuit modules are integrated in a unified metal shielding cavity, the installation space of equipment panel is saved, redundant metal shell material is reduced, production efficiency is improved, installation man -hours and wiring complexity are reduced, modular production is easy to realize standardization and automation, the installation habit of single filter is maintained, and the function of multi -way filtering is realized.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, and in particular to an integrated feedthrough filter. Background Technology

[0002] The description in this section provides only background information related to the disclosure of this utility model and does not constitute prior art.

[0003] A feedpass filter is a filtering device mounted on a metal panel to suppress high-frequency harmonic interference on signals, power lines, etc. In modern electronic equipment, especially in high-reliability fields such as medical equipment and aerospace, feedpass filters are widely used to suppress electromagnetic interference transmitted through wires on the equipment panel. Because feedpass filters are mounted on a metal panel, they have very low grounding impedance, and the metal panel isolates the filter's input and output, thus providing excellent high-frequency filtering performance. Typically, a single device needs to suppress multiple signal or power lines, therefore requiring the installation of multiple independent feedpass filters. Existing technologies mainly employ multiple independent feedthrough filters, which present the following problems: 1. Large space occupation: Each filter requires an independent hole to be drilled on the equipment panel for installation. When the demand is large, this poses a significant challenge to panel space layout, contradicting the trend of equipment miniaturization; 2. Low installation efficiency and high cost: Each filter requires individual tightening and wiring, making the installation process cumbersome, time-consuming, and labor-intensive, leading to increased system assembly costs; 3. High production complexity: Traditional single-unit feedthrough filters typically employ a high-temperature brazing process between a metal casing and a feedthrough capacitor. This process is complex, requires highly skilled operators, and the high-temperature welding process is prone to generating thermal stress, which may lead to potential failure risks such as micro-cracks in the thin-film capacitor, affecting product reliability.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an integrated feedthrough filter to address the shortcomings of the existing technology.

[0006] This application discloses an integrated feedthrough filter, comprising:

[0007] A metal casing, wherein the metal casing has a cavity inside;

[0008] Multiple independent filter circuit modules are arranged in a ring matrix inside the cavity of the metal housing. Each filter circuit module includes an inductor, a feedthrough capacitor, and a connecting terminal. The inductor has a first end and a second end on both sides. The first end of the inductor is connected to a first feedthrough capacitor through the connecting terminal, and the second end of the inductor is connected to a second feedthrough capacitor through the connecting terminal.

[0009] An isolating plate is disposed between adjacent filter circuit modules and is fixedly installed on the inner wall of the metal housing;

[0010] The top cover is mounted on top of the metal housing.

[0011] Furthermore, in the aforementioned integrated feedthrough filter, the metal housing has an input terminal and an output terminal on both sides, respectively.

[0012] Furthermore, in the aforementioned integrated feedthrough filter, the filter circuit module further includes an input screw and an output screw. The input screw is connected to the first feedthrough capacitor and can be connected to the input end of the metal housing via fasteners. The output screw is connected to the second feedthrough capacitor and can be connected to the output end of the metal housing.

[0013] Furthermore, in the aforementioned integrated feedthrough filter, the input screw is assembled to the input end of the metal housing by mechanical pressing or screwing, and the output screw is assembled to the output end of the metal housing by mechanical pressing or screwing.

[0014] Furthermore, in the aforementioned integrated feedthrough filter, there are three filter circuit modules, and the angle between adjacent filter circuit modules is 120°.

[0015] Furthermore, in the aforementioned integrated feedthrough filter, the isolator is made of Mylar film or other insulating materials.

[0016] Furthermore, in the aforementioned integrated feedthrough filter, the top cover is installed on the metal housing by means of laser welding, screwing, or snap-fit ​​to form an electromagnetic shielding cavity.

[0017] In summary, the structure adopted in this embodiment of the present invention has the following advantages:

[0018] The integrated feedthrough filter described in this invention integrates multiple independent filter circuit modules into a unified metal shielded cavity, greatly saving installation space on the equipment panel. This aligns with the trend of high-density and miniaturization in electronic equipment, reduces redundant metal casing material, simplifies assembly processes, improves production efficiency, lowers operator requirements, reduces installation time and wiring complexity, and replaces the traditional high-temperature brazing process for metal casings. This improves production efficiency and product reliability. Modular production facilitates standardization and automation, ensuring consistent and stable product performance. Provided as a standard module, it maintains the installation habits of individual filters while realizing multi-channel filtering functionality.

[0019] To further understand the features and technical content of this utility model, please refer to the following detailed description and drawings of this utility model. However, the drawings provided are for reference and illustration only and are not intended to limit this utility model. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 and Figure 2 This is a schematic diagram of the integrated feedthrough filter in an embodiment of this utility model;

[0022] Figure 3 and Figure 4 This is a schematic diagram of the internal structure of the integrated feedthrough filter in an embodiment of this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the inductor coil and the connecting terminal in an embodiment of this utility model;

[0024] Figure 6 This is a circuit diagram of the filter circuit module in an embodiment of this utility model.

[0025] The reference numerals in the above figures are as follows: 1. Metal casing; 11. Input terminal; 12. Output terminal; 2. Filter circuit module; 21. Inductor coil; 22. Connection terminal; 23. First feedthrough capacitor; 24. Second feedthrough capacitor; 25. Input screw; 26. Output screw; 3. Isolation plate; 4. Top cover; 5. Fastener. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. This utility model can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this utility model. Furthermore, the accompanying drawings of this utility model are for simple illustration only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of this utility model in detail, but the disclosed content is not intended to limit the scope of protection of this utility model.

[0028] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used herein should, as appropriate, include any combination of one or more of the related listed items.

[0029] Reference Figures 1 to 6 As shown in the figure, this application discloses an integrated feedthrough filter, including:

[0030] Metal housing 1, wherein the metal housing 1 has a cavity inside;

[0031] Multiple independent filter circuit modules 2 are arranged in a ring matrix within the cavity of the metal housing 1. Each filter circuit module 2 includes an inductor coil 21, a feedthrough capacitor, and a connecting terminal 22. The inductor coil 21 has a first end and a second end on both sides. The first end of the inductor coil 21 is connected to a first feedthrough capacitor 23 through the connecting terminal 22, and the second end of the inductor coil 21 is connected to a second feedthrough capacitor 24 through the connecting terminal 22. (Refer to...) Figure 6The feedthrough capacitor used in filter circuit module 2 has a much smaller parasitic capacitance than ordinary capacitors, a higher resonant frequency, and significantly better performance than conventional leaded capacitors, providing excellent suppression. The first feedthrough capacitor 23, inductor coil 21, and second feedthrough capacitor 24 together constitute a PI-type low-pass filter circuit, attenuating high-frequency signals in the line. The cutoff frequency can be adjusted by modifying the parameters of these three components to adapt to different application requirements.

[0032] Isolation plate 3 is disposed between adjacent filter circuit modules 2 and is fixedly installed on the inner wall of the metal housing 1; isolation plate 3 is installed on the inner wall of the metal housing 1 near the output end 12 by fastener 5;

[0033] The top cover 4 is installed on the top of the metal housing 1.

[0034] Specifically, in this embodiment, the metal housing 1 is provided with an input terminal 11 and an output terminal 12 on both sides.

[0035] Specifically, in this embodiment, the filter circuit module 2 further includes an input screw 25 and an output screw 26. The input screw 25 is connected to the first feedthrough capacitor 23 and can be connected to the input terminal 11 of the metal housing 1 through a fastener 5. The output screw 26 is connected to the second feedthrough capacitor 24 and can be connected to the output terminal 12 of the metal housing 1.

[0036] Specifically, in this embodiment, the input screw 25 is assembled with the input end 11 of the metal housing 1 by mechanical pressing or screwing, and the output screw 26 is assembled with the output end 12 of the metal housing 1 by mechanical pressing or screwing.

[0037] Specifically, in this embodiment, there are 3 filter circuit modules 2, and the angle between adjacent filter circuit modules 2 is 120°.

[0038] Specifically, in this embodiment, the isolation sheet 3 is made of Mylar film or other insulating materials. Using Mylar film (i.e., polyester film) or other high-performance insulating materials as interlayer isolation and insulation media ensures electrical insulation between filter circuits and between the circuit and the cavity, guaranteeing electrical safety and isolation between channels.

[0039] Specifically, in this embodiment, the upper cover 4 is installed on the metal shell 1 by means of laser welding, screwing, or snap-fit ​​to form an electromagnetic shielding cavity. This replaces the traditional high-temperature brazing process for metal shells, improving production efficiency and product reliability.

[0040] Using the above structure, multiple independent filter circuit modules 2 are integrated into a common, unified housing cavity. Each filter circuit module 2 includes an inductor coil 21, a feedthrough capacitor, and a connecting terminal 22. All components are prepared, the inductor coil 21 is pre-wound, and the first and second ends of the inductor coil 21 are crimped onto the annular connecting terminal 22. The input screw 25, the first feedthrough capacitor 23, the output screw 26, and the second feedthrough capacitor 24 are connected to the connecting terminal 22. The screws are tightened using a set torque, and the input screw 25 is connected to the metal housing 1. The input terminal 11 is assembled using mechanical pressing or screwing. The output screw 26 is assembled with the output terminal 12 of the metal housing 1 using mechanical pressing or screwing. The feedthrough capacitor is tightly contacted with the inner wall of the metal housing 1 to form a complete Π-type or L-type filter circuit. The three filter circuits are isolated using an isolator 3. The top cover 4 is placed on the metal housing 1 and sealed using laser welding, screwing, or snap-fit ​​methods to form a complete electromagnetic shielding cavity. After assembly, conventional electrical performance tests (such as insertion loss, withstand voltage test, insulation resistance test, etc.) can be performed. In this embodiment, the integrated feedthrough filter uses one cavity to replace multiple independent metal housings 1. The isolator 3 uses Mylar film (i.e., polyester film) or other high-performance insulating materials as interlayer isolation and insulation medium to ensure electrical insulation between each filter circuit and between the circuit and the cavity. The feedthrough capacitor is fixed by mechanical crimping and screwing. After the inductor is wound, it is connected to the connection terminal 22 and then assembled into the filter. This simplifies assembly and avoids thermal damage. The integrated filter is a whole module and is connected to the device panel through the mounting holes (screw fixing) on ​​the side. The installation method is compatible with the single filter, which facilitates replacement and upgrade. In this embodiment, multiple independent filter circuit modules 2 are integrated into a unified metal shielded cavity, which greatly saves the installation space of the device panel. This conforms to the development trend of high density and miniaturization of electronic equipment, reduces redundant metal shell materials, simplifies the assembly process, improves production efficiency, reduces the requirements for operators, reduces installation time and wiring complexity, and modular production makes it easy to achieve standardization and automation, ensuring the consistency and stability of product performance. It is provided as a whole standard module, which not only maintains the installation habit of single filter, but also realizes the function of multi-channel filtering.

[0041] The above-disclosed content is only a preferred and feasible embodiment of the present utility model, and is not intended to limit the scope of the patent application of the present utility model. Therefore, all equivalent technical changes made using the contents of the present utility model specification and drawings are included in the scope of the patent application of the present utility model.

[0042] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0043] Although this application has been described by way of examples, those skilled in the art will know that this application has many modifications and variations without departing from the spirit of this application, and it is intended that the appended embodiments include these modifications and variations without departing from this application.

Claims

1. An integrated feedthrough filter, characterized in that, include: A metal casing, wherein the metal casing has a cavity inside; Multiple independent filter circuit modules are arranged in a ring matrix inside the cavity of the metal housing. Each filter circuit module includes an inductor, a feedthrough capacitor, and a connecting terminal. The inductor has a first end and a second end on both sides. The first end of the inductor is connected to a first feedthrough capacitor through the connecting terminal, and the second end of the inductor is connected to a second feedthrough capacitor through the connecting terminal. An isolating plate is disposed between adjacent filter circuit modules and is fixedly installed on the inner wall of the metal housing; The top cover is mounted on top of the metal housing.

2. The integrated feedthrough filter according to claim 1, characterized in that, The metal casing has an input terminal and an output terminal on each side.

3. The integrated feedthrough filter according to claim 2, characterized in that, The filter circuit module further includes an input screw and an output screw. The input screw is connected to the first feedthrough capacitor and can be connected to the input end of the metal housing via fasteners. The output screw is connected to the second feedthrough capacitor and can be connected to the output end of the metal housing.

4. The integrated feedthrough filter according to claim 3, characterized in that, The input screw is assembled to the input end of the metal housing by mechanical pressing or screwing, and the output screw is assembled to the output end of the metal housing by mechanical pressing or screwing.

5. The integrated feedthrough filter according to claim 3, characterized in that, The filter circuit module is provided with 3 units, and the angle between adjacent filter circuit modules is 120°.

6. The integrated feedthrough filter according to claim 1, characterized in that, The isolation sheet is made of Mylar film.

7. The integrated feedthrough filter according to claim 1, characterized in that, The top cover is installed on the metal shell by laser welding, screwing, or snap-fit ​​to form an electromagnetic shielding cavity.

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