A power line conducted emission filter

Abstract

The utility model discloses a power line conduction radiation filter device relates to filter technical field, the utility model discloses a shell that sets up as L shape, the shell inside is provided with the chamber one that is rectangular and the chamber two that is square, the chamber one and the chamber two are separated by the metal plate fixed in the shell interior, the inside of chamber one is provided with circuit board no.

Description

Technical Field

[0001] This utility model belongs to the field of filter technology, and in particular relates to a power line conduction and radiation filtering device. Background Technology

[0002] With the rapid development of electronic technology, various electronic devices are becoming increasingly popular. Their internal high-speed digital circuits and switching power supplies generate strong electromagnetic interference. This interference noise can be conducted outward through the power line, which not only pollutes the public power grid and affects the normal operation of other electronic devices in the same power grid, causing their performance to degrade or even fail, but may also cause the device itself to become unstable due to the introduction of external interference. Therefore, effectively suppressing conducted and radiated interference on the power line is a key link to ensure that electronic devices meet electromagnetic compatibility standards and improve product reliability.

[0003] However, commonly used power line filters on the market typically employ a structure where the filter circuit modules are centrally mounted within a shielded enclosure. When the filter contains multiple stages or multiple filter circuit modules, the lack of effective physical isolation allows electromagnetic fields between different circuits to couple, creating crosstalk. This internal interference severely degrades the filter's high-frequency performance, significantly reducing its suppression effect on noise in specific frequency bands. Furthermore, if the filter's input and output leads are not properly shielded, they can act like antennas, radiating high-frequency noise that is not completely filtered out from within the enclosure, or picking up external interference signals and transmitting them into the device, thus becoming new sources of interference or coupling paths. Therefore, we provide a power line conducted radiation filter device to solve the aforementioned problems. Utility Model Content

[0004] The purpose of this utility model is to provide a power line conduction and radiation filtering device. By using a partition and a wave shield, the filtering circuit module inside the housing is isolated and shielded to ensure the electromagnetic compatibility stability of the entire circuit system.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model is a power line conduction and radiation filtering device, including an L-shaped outer shell; inside the outer shell are a rectangular chamber 1 and a square chamber 2, which are separated by a metal plate fixed inside the outer shell. A circuit board 1 is installed inside chamber 1, and a circuit board 2 is installed inside chamber 2. Filtering circuit modules are soldered to the lower end faces of both circuit boards 1 and 2. Circular openings are provided through the left and right sidewalls of the outer shell located in chambers 1 and 2. Lead wires are provided inside the circular openings, and each lead wire is fitted with a wave-damping sleeve fixed inside the circular opening.

[0007] The present invention is further configured such that the end of each lead wire passing through the inside of the circular opening is electrically connected to the corresponding filter circuit module.

[0008] The present invention is further configured such that long columns are fixed at diagonal positions inside the outer shell, and short columns are fixed at multiple side positions inside the outer shell.

[0009] The present invention is further provided with a cover plate on the upper part of the inner side of the outer shell, which is connected to the upper end face of the long column. The cover plate is screwed onto the position of the long column by a plurality of bolts.

[0010] The present invention is further configured such that circuit board one and circuit board two are both fitted onto the surface of the long column through the recessed portion on the surface, the lower end face of circuit board one and circuit board two are connected to the upper end face of the short column, and circuit board one and circuit board two are connected to the short column by bolts.

[0011] The present invention is further configured such that the circular opening is located below the first circuit board and the second circuit board, and the filter circuit modules are all fixed below the first circuit board and the second circuit board.

[0012] The present invention is further configured such that the filter circuit module located below the first circuit board has two levels of common-mode inductors and four grounded Y capacitors to suppress common-mode interference, and three inter-line X capacitors to suppress differential-mode interference; the filter circuit module located below the second circuit board has one level of common-mode inductor and two grounded Y capacitors to suppress common-mode interference, and two inter-line X capacitors to suppress differential-mode interference.

[0013] This utility model has the following beneficial effects:

[0014] In this invention, a partition and a wave-shielding sleeve are used in combination. The partition divides the interior of the outer shell into two spaces, thereby separating circuit board one and circuit board two. This effectively suppresses the coupling between different signals and solves the electromagnetic compatibility problem during signal transmission between systems. At the same time, the wave-shielding sleeve also serves as a shield, greatly suppressing the interference of the lead wires to other signals and preventing high-frequency noise from coupling to the lead wires and causing electromagnetic compatibility problems for the entire system.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structural appearance of this utility model.

[0018] Figure 2 This is a structural assembly diagram of the outer shell, circuit board one, and circuit board two in this utility model.

[0019] Figure 3 This is a structural assembly diagram of the outer shell and the lead wire in this utility model.

[0020] Figure 4 This is a structural diagram of circuit board one, circuit board two, and the filter circuit module in this utility model.

[0021] Figure 5 This is a diagram showing the internal structure of the outer shell in this utility model.

[0022] Figure 6 This is a schematic diagram of the external structure of this utility model.

[0023] Figure 7 This is a schematic diagram of the filter circuit module of this utility model.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Outer shell; 101. Chamber 1; 102. Chamber 2; 103. Long column; 104. Metal plate; 105. Short column; 106. Round opening; 107. Anti-wave sleeve; 108. Lead wire; 2. Cover plate; 201. Bolt; 3. Circuit board 1; 4. Circuit board 2; 5. Filter circuit module. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] Example

[0028] Please see Figures 1 to 7This utility model is a power line conduction and radiation filtering device, including an L-shaped outer shell 1; inside the outer shell 1 are a rectangular chamber 101 and a square chamber 102, separated by a metal plate 104 fixed inside the outer shell 1. By using the metal plate 104, the coupling phenomenon between different signals can be effectively suppressed, thereby solving the electromagnetic compatibility problem in the signal transmission process between systems. A circuit board 3 is installed inside the chamber 101, and a circuit board 4 is installed inside the chamber 102. The lower end faces of both board 3 and board 4 are soldered with filter circuit modules 5. The side walls of the outer shell 1 located to the left and right of chamber 101 and chamber 2102 are all provided with circular openings 106. The inside of each circular opening 106 is provided with lead wires 108, and each lead wire 108 is fitted with a wave-damping sleeve 107 fixed inside the circular opening 106. The lead wires 108 pass through the corresponding wave-damping sleeves 107 respectively. Thus, the wave-damping sleeves 107 greatly suppress the interference of the lead wires 108 to other signals and prevent high-frequency noise from coupling to the power line and causing electromagnetic compatibility problems of the entire system.

[0029] Specifically, the filter circuit module 5 located below circuit board 3 has two levels of common-mode inductors and four grounded Y capacitors to suppress common-mode interference, and uses three inter-line X capacitors to suppress differential-mode interference. The filter circuit module 5 located below circuit board 4 has one level of common-mode inductor and two grounded Y capacitors to suppress common-mode interference, and uses two inter-line X capacitors to suppress differential-mode interference.

[0030] The outer casing 1 has long columns 103 fixed at diagonal positions inside, and short columns 105 fixed at multiple side positions inside. A cover plate 2, connected to the upper surface of the long columns 103, is located on the upper part of the inner side of the outer casing 1. The cover plate 2 is screwed onto the long columns 103 using multiple bolts 201. Circuit boards 3 and 4 are fitted onto the surface of the long columns 103 through recessed areas. The lower surfaces of circuit boards 3 and 4 are connected to the upper surfaces of the short columns 105. Circuit boards 3 and 4 are connected to the short columns 105 using bolts 201. The cover plate 2 is installed on the outer casing 1. The long columns 103 abut against the cover plate 2, limiting its position inside the outer casing 1 and preventing it from extending excessively inside. Simultaneously, the short columns 105 limit the position of circuit boards 3 and 4, ensuring they are stably positioned inside the outer casing 1.

[0031] Furthermore, the end of each lead wire 108 passing through the inside of the circular opening 106 is electrically connected to the corresponding filter circuit module 5. The circular opening 106 is located below the first circuit board 3 and the second circuit board 4. The filter circuit modules 5 are all fixed below the first circuit board 3 and the second circuit board 4. By setting the filter circuit modules 5 below the first circuit board 3 and the second circuit board 4, the filter circuit modules 5 can be aligned with the position of the circular opening 106, so that the lead wire 108 can be accurately electrically connected to the filter circuit module 5, reducing the bending of the lead wire 108 inside the housing.

[0032] The working principle of this embodiment is as follows: The metal plate 104 is installed in the housing 1, thus dividing the interior of the housing 1 into two independent spaces, chamber one 101 and chamber two 102. This isolates the circuit board one 3 and circuit board two 4 inside the housing 1, effectively suppressing the coupling phenomenon between different signals. At the same time, the anti-wave sleeve 107 is installed on the lead wire 108, which greatly suppresses the interference of the lead wire 108 to other signals. Furthermore, the input and output signals are obtained through the filter circuit module 5. The shielding effectiveness is improved by using the circuit board traces and the large area of ​​copper grounding on the circuit board, which greatly suppresses the electromagnetic interference signal after filtering.

[0033] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A power line conduction and radiation filtering device, comprising an L-shaped housing; characterized in that: The outer shell contains a rectangular chamber 1 and a square chamber 2, which are separated by a metal plate fixed inside the outer shell. A circuit board 1 is installed inside chamber 1, and a circuit board 2 is installed inside chamber 2. Filter circuit modules are soldered to the lower end faces of both circuit boards 1 and 2. Circular openings are provided through the left and right sidewalls of the outer shell located in chambers 1 and 2. Lead wires are installed inside each circular opening, and each lead wire is fitted with a wave-damping sleeve fixed inside the circular opening.

2. The power line conduction and radiation filtering device according to claim 1, characterized in that, The end of each lead wire that passes through the inside of the circular opening is electrically connected to the corresponding filter circuit module.

3. The power line conduction and radiation filtering device according to claim 1, characterized in that, Long columns are fixed at diagonal positions inside the outer shell, and short columns are fixed at multiple side positions inside the outer shell.

4. A power line conduction and radiation filtering device according to claim 3, characterized in that, The upper part of the inner side of the outer shell is provided with a cover plate that connects to the upper end face of the long column. The cover plate is screwed onto the long column by a plurality of bolts.

5. A power line conduction and radiation filtering device according to claim 3, characterized in that, Both circuit boards 1 and 2 are fitted onto the surface of the long column through recessed portions on their surfaces. The lower ends of both circuit boards 1 and 2 are connected to the upper ends of the short column. Both circuit boards 1 and 2 are connected to the short column by bolts.

6. A power line conduction and radiation filtering device according to claim 1, characterized in that, The circular opening is located below both circuit boards one and two, and the filter circuit modules are both fixed below circuit boards one and two.

7. A power line conduction and radiation filtering device according to claim 1, characterized in that, The filter circuit module located at the bottom of the circuit board has two common-mode inductors and four grounded Y capacitors to suppress common-mode interference, and three inter-line X capacitors to suppress differential-mode interference. The filter circuit module located at the bottom of the second circuit board has a common-mode inductor and two grounded Y capacitors to suppress common-mode interference, and two inter-line X capacitors to suppress differential-mode interference.

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