Internal shielding assembly of power supply filter

Abstract

The invention relates to the technical field of filters, in particular to an internal shielding component of a power filter, which comprises a shell, a cover plate is mounted at the top of the shell through a cross recessed countersunk head screw, and a metal partition plate is arranged on one side of the inner wall of the shell; the wave-proof sleeve is welded on one side wall of the shell, and the material of the wave-proof sleeve is light nickel-plated copper fabric; when the power supply filter is used, the problem that crosstalk coupling is formed between interference signals can be prevented, the electromagnetic compatibility in the signal transmission process between systems is solved, the anti-wave sleeve is adopted for shielding power supply input of the power supply filter, interference of an input cable on other signals is greatly restrained, and the service life of the power supply filter is prolonged. The electromagnetic compatibility problem of the whole system caused by the fact that high-frequency noise is coupled to a power line is prevented, the shielding effectiveness is improved, the problem of filtering post-stage electromagnetic interference signals is greatly restrained, meanwhile, the heat dissipation area is increased, and the heat dissipation efficiency and effect are improved.

Description

Technical Field

[0001] The invention relates to the technical field of filters, and in particular to an internal shielding component of a power supply filter. Background Art

[0002] The power filter is a filter circuit composed of capacitors, inductors and resistors, also known as "power EMI filter" or "EMI power filter", a passive bidirectional network with power supply at one end and load at the other end. The principle of the power filter is an impedance matching network: the greater the impedance matching between the input and output sides of the power filter and the power supply and load sides, the more effective the attenuation of electromagnetic interference. The filter can effectively filter out the frequency point of a specific frequency in the power line or the frequency outside the frequency point, and obtain a power signal of a specific frequency, or eliminate the power signal after a specific frequency.

[0003] The power filter is a filtering device that can conduct radiation from the power line of the customer's equipment. The structure of the filtering device is mainly composed of a housing, a cover plate, a circuit board, a filtering circuit, and lead wires. For example, the existing public document CN111800103B-A power filter discloses a power filter with high reliability;

[0004] Although the existing disclosed power supply filter can achieve a shielding effect, it still has certain shortcomings in actual use: first, the existing power supply filter cannot effectively suppress the coupling phenomenon between different signals and cannot suppress the interference of the input cable to other signals, causing electromagnetic compatibility problems of the entire system; second, the high-frequency filtering effect of the existing power supply filter is poor, resulting in poor shielding effectiveness and difficulty in suppressing the electromagnetic interference signal of the post-filtering stage; finally, the existing power supply filter lacks heat dissipation measures inside, and the internal heat is difficult to dissipate when it is working, which will affect the normal use of the power supply filter; therefore, it is necessary to improve the existing technology to solve the above technical problems. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the fact that the above-mentioned existing power supply filter cannot effectively suppress the coupling phenomenon between different signals and cannot suppress the interference of the input cable to other signals, causing the electromagnetic compatibility problem of the entire system, an internal shielding component of the power supply filter is proposed.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: an internal shielding component of a power supply filter, comprising an outer shell, a cover plate is installed on the top of the outer shell by means of cross slot countersunk screws, a metal partition is arranged on one side of the inner wall of the outer shell; and a wave-proof sleeve, which is welded on one side wall of the outer shell and is made of light nickel-plated copper fabric.

[0008] As a preferred solution of an internal shielding component of a power filter of the present invention, insulated wires are provided through both outer walls of the shell, and an insulating gasket is bonded to the opening of the other side wall of the shell.

[0009] As a preferred solution of an internal shielding component of a power supply filter of the present invention, a first circuit board is installed on the inner side of the housing through cross-slot pan head screws, and a plurality of capacitors are arranged on the surface of the first circuit board.

[0010] The beneficial effects of the present invention are as follows: the interior of the outer shell of the power filter is divided into two chambers by the metal partition and the wave-proof sleeve, wherein the metal partition has a good shielding function, can prevent the problem of crosstalk coupling between interference signals, solve the electromagnetic compatibility in the process of signal transmission between systems, and the wave-proof sleeve is used for shielding at the power input of the power filter, which greatly suppresses the interference of the input cable to other signals and prevents high-frequency noise from coupling to the power line, causing electromagnetic compatibility problems of the entire system.

[0011] In view of the poor high-frequency filtering effect of the existing power supply filter, resulting in poor shielding effectiveness and difficulty in suppressing the electromagnetic interference signal of the post-filtering stage, a further improvement of the internal shielding component of the power supply filter is proposed.

[0012] As a preferred solution of an internal shielding component of a power supply filter of the present invention, it also includes a filter component that is arranged through the inside of a metal partition, and the filter component includes a first through-hole filter and a second through-hole filter that respectively penetrate the front and rear ends of the metal partition, and a hexagonal thin nut that is threadedly sleeved on the outer walls of the two.

[0013] As a preferred solution of an internal shielding component of a power supply filter of the present invention, an insulating plate is sleeved on one side of the outer wall of the first feedthrough filter and the second feedthrough filter, and a second circuit board is arranged on one side of the insulating plate.

[0014] As a preferred solution of an internal shielding component of a power supply filter of the present invention, it also includes filtering circuits arranged on both sides of the bottom of the first circuit board.

[0015] Another beneficial effect of the present invention is that by setting a filter component and a filter circuit, the filter circuit of the power supply adopts a two-stage filter circuit, the circuit has a two-stage common-mode inductor and four grounded Y capacitors to suppress common-mode interference, and three line-to-line X capacitors are used to suppress differential-mode interference. In order to improve the high-frequency filtering effect of the power supply part, two grounded through-hole filters are added, and the first through-hole filter and the second through-hole filter both have an insertion loss of more than 50db at 1GHZ-10GHZ, and the input and output signals of the filter circuit of the power supply use the circuit board routing and the large-area copper-clad grounding of the circuit board to improve the shielding effectiveness, which greatly suppresses the problem of electromagnetic interference signals in the post-filtering stage.

[0016] In view of the lack of heat dissipation measures inside the existing power filter, the internal heat is difficult to dissipate when it is working, which will affect the normal use of the power filter. Therefore, a further improvement of the internal shielding component of the power filter is proposed.

[0017] As a preferred solution of an internal shielding component of a power supply filter of the present invention, it also includes a heat dissipation component arranged on one side of the bottom of the shell, the heat dissipation component includes a mounting plate installed on the bottom of the shell by cross-slot countersunk screws and a fixed heat conductive plate arranged on one side above the mounting plate, and a groove is arranged on one side of the upper surface of the mounting plate.

[0018] As a preferred solution of an internal shielding component of a power filter of the present invention, slots are provided on the front and rear end surfaces of the fixed heat conductive plate, telescopic copper tubes are installed in an array along the horizontal direction on the front and rear end surfaces of the upper surface of the fixed heat conductive plate, and a heat absorbing plate is installed on the top of the telescopic copper tubes.

[0019] As a preferred solution of an internal shielding component of a power filter of the present invention, a spring is sleeved on the outer wall of the telescopic copper tube, movable heat conducting plates are arranged at the front and rear ends of the fixed heat conducting plate, and a plug plate is fixedly connected to one side wall of the movable heat conducting plate.

[0020] As a preferred solution of an internal shielding component of a power filter of the present invention, wherein: heat dissipation copper tubes are installed in an array along the horizontal direction on the outer side of the upper surface of the movable heat conductive plate, and the outer wall of the heat dissipation copper tube is arrayed with heat dissipation fins from top to bottom; wherein, the fixed heat conductive plate is embedded and installed on one side of the bottom of the shell, the spring is located between the fixed heat conductive plate and the heat absorbing plate, and the plug-in plate is plugged into the adjacent slot.

[0021] Another beneficial effect of the present invention is that by setting up a heat dissipation component, the elastic performance of the spring makes the heat absorption plate close to the bottom of the first circuit board, thereby improving the heat absorption effect, and the absorbed heat is transferred to the heat dissipation copper tube and the heat dissipation fins under the action of the telescopic copper tube, the fixed heat conductive plate, and the movable heat conductive plate, so as to increase the heat dissipation area and improve the heat dissipation efficiency and effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0023] Figure 1 The overall structure of the internal shielding component of the power filter in the present invention is shown in FIG. Figure 1 .

[0024] Figure 2 The overall structure of the internal shielding component of the power filter in the present invention is shown in FIG. Figure 2 .

[0025] Figure 3 It is a vertical cross-sectional view of the internal shielding component of the power filter in the present invention.

[0026] Figure 4 It is a schematic diagram of disassembling the internal shielding component of the power filter in the present invention.

[0027] Figure 5 For the present invention Figure 4 Schematic diagram of the disassembly of the filter components in the structure.

[0028] Figure 6 For the present invention Figure 4 Schematic diagram of the disassembly of the heat dissipation components in the structure.

[0029] Figure 7 Detailed circuit diagram of the filter circuit of the present invention.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0031] 100, housing; 101, cover; 102, insulated wire; 103, insulating gasket; 104, metal partition; 105, first circuit board; 105a, capacitor; 200, wave-proof sleeve; 300, filter assembly; 301, first through-hole filter; 302, second through-hole filter; 303, hexagonal thin nut; 304, insulating plate; 305, second circuit board; 400, filter circuit; 500, heat dissipation assembly; 501, mounting plate; 501a, groove; 502, fixed heat conducting plate; 502a, slot; 503, telescopic copper tube; 504, spring; 505, heat absorbing plate; 506, movable heat conducting plate; 506a, plug-in board; 507, heat dissipation copper tube; 508, heat dissipation fin. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0035] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0036] Example 1

[0037] Reference Figure 1 , Figure 2 and Figure 3 , which is the first embodiment of the present invention, and this embodiment provides an internal shielding component of a power supply filter. The internal shielding component can achieve a shielding function through a metal partition 104 and a wave-proof sleeve 200 to prevent interference signal crosstalk coupling and high-frequency noise from coupling to the power line and affecting the entire system.

[0038] Specifically, the shell 100, the top of the shell 100 is installed with a cover plate 101 by means of cross recessed countersunk screws, and a metal partition plate 104 is provided on one side of the inner wall of the shell 100; and, the wave-proof sleeve 200, the wave-proof sleeve 200 is welded on one side wall of the shell 100, and the material of the wave-proof sleeve 200 is light nickel-plated copper fabric.

[0039] When the above arrangement is in use, the interior of the housing 100 of the power filter is divided into two chambers by the metal partition 104, wherein the metal partition 104 has a good shielding function, which can prevent the problem of crosstalk coupling between interference signals and solve the electromagnetic compatibility in the process of signal transmission between systems. In addition, the power input of the power filter is shielded by a wave-proof sleeve 200, which greatly suppresses the interference of the input cable to other signals and prevents high-frequency noise from coupling to the power line, causing electromagnetic compatibility problems for the entire system.

[0040] Furthermore, the wave-proof sleeve 200 is welded to ensure that it is firm and not loose, and the metal partition 104 can effectively suppress the coupling phenomenon between different signals.

[0041] Read in detail Figure 2 and Figure 4 As shown, insulated wires 102 are provided through both side outer walls of the shell 100, and an insulating gasket 103 is bonded to the opening of the other side wall of the shell 100; a first circuit board 105 is installed on one side of the inner part of the shell 100 by cross-slot pan head screws, and a plurality of capacitors 105a are provided on the surface of the first circuit board 105.

[0042] Furthermore, the insulated conductor 102 is a silver-plated copper core wrapped with polytetrafluoroethylene film, and the insulating gasket 103 is bonded with DG-3S adhesive, which is firm and not loose.

[0043] Example 2

[0044] Reference Figure 4 and Figure 5 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but differs in that, in order to suppress the post-filtering electromagnetic interference signal, a two-stage filtering circuit 400 and a first through-hole filter 301 and a second through-hole filter 302 are used to improve the high-frequency filtering effect.

[0045] Specifically, it also includes a filter assembly 300 that penetrates the metal partition 104, and the filter assembly 300 includes a first through-hole filter 301 and a second through-hole filter 302 that penetrate the front and rear ends of the metal partition 104 respectively, and a hexagonal thin nut 303 that is threadedly sleeved on the outer walls of the two; an insulating plate 304 is sleeved on one side of the outer wall of the first through-hole filter 301 and the second through-hole filter 302, and a second circuit board 305 is arranged on one side of the insulating plate 304; and also includes a filter circuit 400 arranged on both sides of the bottom of the first circuit board 105;

[0046] When the above arrangement is in use, the filter circuit 400 of the power supply adopts a two-stage filter circuit 400, which has a two-stage common-mode inductor and four grounded Y capacitors 105a to suppress common-mode interference, and adopts three line-to-line X capacitors 105a to suppress differential-mode interference. In order to improve the high-frequency filtering effect of the power supply part, two grounded feedthrough filters are added. The first feedthrough filter 301 and the second feedthrough filter 302 have an insertion loss of more than 50db at 1GHZ-10GHZ, and the input and output signals of the filter circuit 400 of the power supply use the circuit board routing and the large-area copper grounding of the circuit board to improve the shielding effectiveness, which greatly suppresses the problem of electromagnetic interference signals in the post-filtering stage.

[0047] Furthermore, the resin-sealed screw-mounted filter (i.e., the first through-hole filter 301 and the second through-hole filter 302) is fixed to the metal partition 104 with an M4 hexagonal thin nut 303, and the through-hole adapter circuit board is welded with the wire (P is welded with 1.5R-250mm, and N is welded with 1.5B-250mm cables). After trimming the solder joints, the insulating plate 304 is used for soldering with the through-holes of the circuit board. The output cable passes through the via holes of the circuit board and is then soldered to the circuit board pads. The input cable interface is fixed with a cable tie to prevent the solder joints from being pulled and stressed. When the first circuit board 105 is installed in the shell, a polytetrafluoroethylene film is required to be padded on the bottom of the shell and insulated. Before the product is sealed, a polytetrafluoroethylene film is padded and fixed with silicone rubber. Then the product is sealed and thread glue is applied to the screws.

[0048] Example 3

[0049] Reference Figure 4 and Figure 6 , which is the third embodiment of the present invention, is based on the above-mentioned embodiment 1, except that, in order to improve the heat dissipation effect, the number and area of ​​the heat dissipation fins 508 on the heat dissipation copper tube 507 are increased to achieve the purpose of increasing the heat dissipation area.

[0050] Specifically, it also includes a heat dissipation component 500 arranged on one side of the bottom of the housing 100, and the heat dissipation component 500 includes a mounting plate 501 mounted on the bottom of the housing 100 by cross-slot countersunk screws and a fixed heat conducting plate 502 arranged on one side above the mounting plate 501, and a groove 501a is arranged on one side of the upper surface of the mounting plate 501; the front and rear end surfaces of the fixed heat conducting plate 502 are both provided with slots 502a, and the front and rear end surfaces of the upper surface of the fixed heat conducting plate 502 are arranged in an array along the horizontal direction, and a heat absorbing plate 505 is installed on the top of the telescopic copper tube 503; the telescopic copper tube 50 3, a spring 504 is sleeved on the outer wall, a movable heat conducting plate 506 is arranged at the front and rear ends of the fixed heat conducting plate 502, and a plug plate 506a is fixedly connected to one side wall of the movable heat conducting plate 506; a heat dissipation copper tube 507 is arranged in an array along the horizontal direction on the outer side of the upper surface of the movable heat conducting plate 506, and a heat dissipation fin 508 is sleeved on the outer wall of the heat dissipation copper tube 507 from top to bottom; wherein, the fixed heat conducting plate 502 is embedded and installed at one side of the bottom of the housing 100, the spring 504 is located between the fixed heat conducting plate 502 and the heat absorbing plate 505, and the plug plate 506a is plugged into the adjacent slot 502a;

[0051] When the above arrangement is in use, the first circuit board 105 inside the housing 100 is installed in a cavity on one side of the housing 100. The first circuit board 105 is placed on the surface of the heat absorbing plate 505 when installed, and the first circuit board 105 is pressed downward and installed in the cavity using a cross-slot countersunk screw. After the heat absorbing plate 505 is subjected to force, it moves inward and squeezes the telescopic copper tube 503 and the spring 504. Under the reverse force of the spring 504, the surface of the heat absorbing plate 505 is tightly attached to the bottom of the first circuit board 105, so that it can absorb heat stably. After absorbing heat, the heat absorbing plate 505 transfers the heat to the heat dissipation copper tube 507 and the heat dissipation fins 508 under the action of the telescopic copper tube 503, the fixed heat conductive plate 502 and the movable heat conductive plate 506, so as to increase the heat dissipation area, thereby achieving the purpose of improving the heat dissipation effect and ensuring the normal use of the power filter.

[0052] Furthermore, the fixed heat conducting plate 502 is embedded in the bottom of the housing 100, and the mounting plate 501 can be disassembled and assembled by means of cross-slot countersunk screws. The protruding position at the bottom of the fixed heat conducting plate 502 can be inserted into the groove 501a on the surface of the mounting plate 501. Two movable heat conducting plates 506 are provided, which can be slid into the groove 501a, and the movable heat conducting plate 506 is connected to the fixed heat conducting plate 502 under the action of the plug-in plate 506a and the slot 502a to realize heat transfer. The spring 504 is used to make the heat absorbing plate 505 close to the bottom of the first circuit board 105, thereby improving the efficiency and effect of heat absorption.

[0053] In addition, it should be noted that the components not described in detail in this article are prior art.

[0054] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only several embodiments are described in detail in this disclosure, it should be easily understood by the personnel referring to this disclosure that many modifications are possible (for example, the size, scale, structure, shape and ratio of various elements, and parameter values ​​(for example, temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to specific embodiments, but extends to multiple modifications that still fall within the scope of the appended claims.

[0055] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0056] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An internal shielding component of a power filter, characterized in that: include, A housing (100), a cover plate (101) being mounted on the top of the housing (100) by means of cross recessed countersunk screws, and a metal partition plate (104) being disposed on one side of the inner wall of the housing (100); and, The wave-proof sleeve (200) is welded on a side wall of the shell (100), and the material of the wave-proof sleeve (200) is light nickel-plated copper fabric.

2. An internal shielding component of a power supply filter as claimed in claim 1, characterized in that: Insulated wires (102) are provided through both side outer walls of the housing (100), and an insulating gasket (103) is bonded to the opening of the other side wall of the housing (100).

3. An internal shielding component of a power supply filter as claimed in claim 2, characterized in that: A first circuit board (105) is mounted on one side of the interior of the housing (100) via cross-slot pan head screws, and a plurality of capacitors (105a) are arranged on the surface of the first circuit board (105).

4. An internal shielding component of a power supply filter as claimed in claim 1, characterized in that: It also includes a filter assembly (300) that is arranged to penetrate the interior of the metal partition (104), and the filter assembly (300) includes a first through-hole filter (301) that penetrates the front and rear ends of the interior of the metal partition (104), a second through-hole filter (302), and a hexagonal thin nut (303) that is threadedly sleeved on the outer walls of the two.

5. An internal shielding component of a power supply filter as claimed in claim 4, characterized in that: An insulating plate (304) is sleeved on one side of the outer wall of the first through-hole filter (301) and the second through-hole filter (302), and a second circuit board (305) is provided on one side of the insulating plate (304).

6. An internal shielding component of a power supply filter as claimed in claim 3, characterized in that: It also includes filter circuits (400) arranged on both sides of the bottom of the first circuit board (105).

7. An internal shielding component of a power supply filter as claimed in claim 1, characterized in that: It also includes a heat dissipation component (500) arranged on one side of the bottom of the housing (100), the heat dissipation component (500) including a mounting plate (501) mounted on the bottom of the housing (100) by means of cross-slot countersunk screws and a fixed heat conducting plate (502) arranged on one side above the mounting plate (501), and a groove (501a) is arranged on one side of the upper surface of the mounting plate (501).

8. An internal shielding component of a power supply filter as claimed in claim 7, characterized in that: The front and rear end surfaces of the fixed heat conducting plate (502) are both provided with slots (502a), the front and rear end surfaces of the upper surface of the fixed heat conducting plate (502) are provided with telescopic copper tubes (503) arranged in an array along a horizontal direction, and a heat absorbing plate (505) is provided at the top end of the telescopic copper tubes (503).

9. An internal shielding component of a power supply filter as claimed in claim 8, characterized in that: A spring (504) is sleeved on the outer wall of the telescopic copper tube (503), and movable heat conducting plates (506) are arranged at the front and rear ends of the fixed heat conducting plate (502), and a plug plate (506a) is fixedly connected to one side wall of the movable heat conducting plate (506).

10. An internal shielding component of a power filter according to claim 9, characterized in that: A heat dissipation copper tube (507) is installed in an array along the horizontal direction on the outer side of the upper surface of the movable heat conducting plate (506), and heat dissipation fins (508) are arranged in an array from top to bottom on the outer wall of the heat dissipation copper tube (507); The fixed heat conducting plate (502) is embedded and installed on one side of the bottom of the housing (100), the spring (504) is located between the fixed heat conducting plate (502) and the heat absorbing plate (505), and the plug-in plate (506a) is plugged into the adjacent slot (502a).

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