Integrated filtering plug

Abstract

The utility model provides an integrated filtering plug, which comprises a shell, a cover plate, a connector and a power supply filtering circuit board, a plurality of groups of filtering circuits are arranged on the circuit board, filtered output leads are led out of the shell through independent threading holes, and insulators are arranged in the threading holes to avoid mutual interference of the leads. According to the design, a plurality of filter circuits are integrated in a small device, the complexity of an external circuit is reduced, the anti-interference capability is improved through shielding and isolation processing, the requirements of modern electronic equipment for compact space and efficient filtering are met, and the filter is particularly suitable for application scenes of multiple power supplies and multiple modules.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter equipment technical field especially relates to an integrated filter plug. BACKGROUND

[0002] In the prior art, the filter and the power plug are usually designed separately, that is, the filter is designed as an independent module and is installed separately from the plug, cable or power terminal. Because the conventional filter usually relies on large-size inductors and capacitor elements to ensure the filtering effect, especially when processing different power signals, multiple filters often need to maintain a certain physical distance to avoid electromagnetic coupling and interference, which makes the filter bulky and difficult to meet the demand of compact design of modern devices. In addition, due to the separation of the filter and the plug, the length of the connecting cable increases, which may cause electromagnetic interference or loss during signal transmission, thereby reducing the anti-interference ability of the system; secondly, in a device, multiple modules often require different voltages, so multiple power signals need to be filtered. In the existing design, multiple filters are often installed to meet the needs of different voltages, further increasing the installation difficulty and maintenance cost of the device.

[0003] Therefore, how to integrate the filter and the plug in one, process different electrical signals in a limited space, and reduce the mutual interference and coupling between different power filtering paths through reasonable circuit layout has become an important challenge in design. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model provides an integrated filter plug, which integrates multiple sets of filter circuits in a small integrated power filter device, and solves the problem of mutual coupling and interference of power lines.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] An integrated filter plug comprises a shell, a cover plate and a power filter circuit board; the shell forms a cavity inside, and the power filter circuit board is arranged in the shell; the shell and the cover plate are detachably connected;

[0007] One connector is assembled on one side of the shell, and the connector contains at least one set of power connection terminals;

[0008] The power filter circuit board is provided with a plurality of filter circuits;

[0009] The input end of any filter circuit corresponds to one set of power terminals of the connector; at least one threading hole is formed in the shell, and the output of the filter circuit is connected with an output wire and led out to the outside of the shell through the threading hole;

[0010] The hole of the threading hole is along the insulator mounted.

[0011] Beneficial effects: the application effectively isolates multiple groups of power signals by reasonably arranging the power connection terminals and ground terminals of the connector, reduces the coupling and interference between them; the positive and negative output leads of different filter circuits are extended to the outside of the shell through independent threading holes, and insulators are arranged in the threading holes. Compared with the prior art, the filter and the plug are integrated, different electrical signals are processed in a limited space, the input and output signals of multiple filter circuits are shielded and isolated, and the problem of mutual coupling and interference of the input and output of different filter circuits is solved.

[0012] Further, the filter circuit includes a common mode inductor and a plurality of capacitors; the positive input end and the negative input end of the common mode inductor are respectively used as the positive input end and the negative input end of the filter circuit, and the positive output end and the negative output end of the common mode inductor are respectively used as the positive output end and the negative output end of the filter circuit; the second capacitor and the third capacitor connected in series are connected between the positive input end and the negative input end of the common mode inductor, the second capacitor and the third capacitor are grounded between them, and the first capacitor is connected in parallel with the two ends of the second capacitor and the third capacitor away from the ground; the fifth capacitor and the sixth capacitor connected in series are connected between the positive output end and the negative output end of the common mode inductor, the fifth capacitor and the sixth capacitor are grounded between them, the fourth capacitor is connected in parallel with the two ends of the fifth capacitor and the sixth capacitor away from the ground, and the seventh capacitor and the eighth capacitor connected in series are also connected in parallel with the two ends of the fifth capacitor and the sixth capacitor away from the ground, and the seventh capacitor and the eighth capacitor are grounded between them.

[0013] Preferably, the capacitors are all multilayer ceramic chip capacitors.

[0014] Further, at least one ground terminal is arranged between any two groups of power connection terminals for connecting the ground end of the filter circuit and isolating the two groups of signals.

[0015] Further, a polytetrafluoroethylene film is arranged between the common mode inductor and the power filter circuit board; and a polytetrafluoroethylene film is arranged between the power filter circuit board and the cover plate and the connector.

[0016] Further, one side of the shell is fixedly connected with the connector through a screw, and a conductive gasket is arranged between the connector and the shell.

[0017] The ground ends of the plurality of filter circuits are connected in common through a conductive gasket, and the conductive gasket and the screw are in contact for grounding.

[0018] Preferably, a silica gel layer for fixation is further arranged at the connection between the shell and the connector.

[0019] Preferably, the positive output lead and the negative output lead are both silver-plated copper core polytetrafluoroethylene film wrapped insulation lead wires.

[0020] Beneficial effects: the application further enhances the shielding effect by connecting the ground terminals of several filter circuits through conductive pads and screw connections for grounding, and reduces the coupling and interference between multiple groups of power signals. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is an internal structure schematic view of an embodiment of the integrated filter plug.

[0022] Figure 2 It is a cover plate structure schematic view of an embodiment of the integrated filter plug.

[0023] Figure 3 It is a connector structure schematic view of an embodiment of the integrated filter plug.

[0024] Figure 4 It is a circuit principle diagram of an embodiment of the integrated filter plug.

[0025] In the above drawings:

[0026] 1, shell; 2, threading hole; 3, cover plate; 4, screw; 5, power filter circuit board; 6, first filter circuit; 7, second filter circuit; 8, positive output lead; 9, negative output lead; 10, connector; 11, terminal; 12, insulator; 13, conductive pad. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, and the example embodiments can be implemented in various forms and should not be understood as being limited to the examples set forth herein; on the contrary, these embodiments are provided so that the present application will be more comprehensive and complete, and the concepts of the example embodiments will be fully conveyed to those skilled in the art. In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] As Figure 1 , Figure 2As shown, the embodiment provides a one-piece filter plug, comprising a shell 1, the shell 1 is provided with a threading hole 2 and a cover plate 3 sealing the inner cavity, the shell 1 is connected with the cover plate 3 through a screw 4; the inside of the shell 1 is provided with a power filter circuit board 5, the filter circuit provided on the power filter circuit board 5 in the embodiment comprises a first filter circuit 6 and a second filter circuit 7.

[0029] As shown in Figure 1 , Figure 2 The connector 10 is provided at the bottom of the shell 1, the connector 10 is provided with a plurality of terminals 11, the terminals 11 comprise power connection terminals and ground terminals; the input ends of the first filter circuit 6 and the second filter circuit 7 correspond to a group of power connection terminals of the connector 10, at least one ground terminal is provided between any two groups of power connection terminals for isolating the two groups of signals and grounding; the positive output end and the negative output end of the first filter circuit 6 are connected with a positive output wire 8 and a negative output wire 9 respectively and extend to the outside of the shell 1 through the corresponding threading holes 2; the positive output end and the negative output end of the second filter circuit 7 are connected with the positive output wire 8 and the negative output wire 9 respectively and extend to the outside of the shell 1 through the corresponding threading holes 2. In the embodiment, the terminals 11 of the connector 10 are reasonably arranged, the plurality of groups of power signals are effectively isolated, the coupling and interference between each other are reduced; the filter and the plug are integrated, different electrical signals are processed in the limited space, and the complexity of the external circuit is reduced.

[0030] In order to ensure the insulation between the wire and the shell 1, the above-mentioned wire adopts silver-plated copper core polytetrafluoroethylene film wrapped insulation wire, an insulator 12 is installed at each threading hole 2, the insulator 12 is installed from the inside of the shell 1 to the outside and is fixed by using adhesive. The connector 10 is connected with the shell 1 through the screw 4, in order to ensure the connectivity between the shell 1 and the connector 10, a conductive gasket 13 is provided at the connection position, the ground terminals of the first filter circuit 6 and the second filter circuit 7 are connected in common through the conductive gasket 13; the connection position between the inside of the shell 1 and the connector 10 is fixed by using silica gel, the stability of the connection between the two is ensured. In order to ensure the insulation effect between the components and the circuit board, a polytetrafluoroethylene tube is sleeved before inductance welding is performed, and DG-3S dispensing is used for fixing after the inductance welding is completed. In the embodiment, the output wires of different filter circuits are extended to the outside of the shell 1 through independent threading holes 2, the insulator 12 is provided in the wire hole, the output signals of the plurality of filter circuits are shielded and isolated, and the problem of mutual coupling and interference of the output wires of different filter circuits is solved.

[0031] Figure 4For the circuit principle of one embodiment of the utility model, two filter circuits, a first filter circuit 6 and a second filter circuit 7, are arranged on the power filter circuit board 5 in the embodiment. The first filter circuit 6 comprises a common mode inductor L1 connected in series with a first input end P1, N1 and a first output end P1', N1'; the input end P1, N1 of the common mode inductor L1 is connected in series with a capacitor C2 and a capacitor C3 in sequence, the capacitor C2 and the capacitor C3 are grounded, the capacitor C2 and the capacitor C3 are connected in parallel with a capacitor C1, the output end P1', N1' of the common mode inductor L1 is connected in series with a capacitor C5 and a capacitor C6 in sequence, the capacitor C5 and the capacitor C6 are grounded, the capacitor C5 and the capacitor C6 are connected in parallel with a capacitor C4, the capacitor C5 and the capacitor C6 are further connected in parallel with a capacitor C7 and a capacitor C8, and the capacitor C7 and the capacitor C8 are grounded.

[0032] The second filter circuit 7 comprises a common mode inductor L2 connected in series with a second input end P2, N2 and a second output end P2', N2', the input end P2, N2 of the common mode inductor L2 is connected in series with a capacitor C10 and a capacitor C11 in sequence, the capacitor C10 and the capacitor C11 are grounded, the capacitor C10 and the capacitor C11 are connected in parallel with a capacitor C9; the output end P2', N2' of the common mode inductor L2 is connected in series with a capacitor C13 and a capacitor C14 in sequence, the capacitor C13 and the capacitor C14 are grounded, the capacitor C13 and the capacitor C14 are connected in parallel with a capacitor C2, the capacitor C13 and the capacitor C14 are further connected in parallel with a capacitor C15 and a capacitor C16, and the capacitor C15 and the capacitor C16 are grounded. In the embodiment, two first-order filter circuits are adopted in the whole power filter device, each filter circuit is provided with one common mode inductor and four grounded Y capacitors to suppress common mode interference, and two interline X capacitors are adopted to suppress differential mode interference, so that the high-frequency filtering effect of the power supply part is improved.

[0033] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application, although the present application 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 application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. An integrated filter plug, characterized in that: The device comprises a housing, a cover plate, and a power filter circuit board; the housing forms a cavity inside, and the power filter circuit board is disposed inside the housing; the housing and the cover plate are detachably connected; a connector is mounted on one side of the housing, and the connector includes at least one set of power connection terminals; The power filter circuit board is provided with a plurality of filter circuits; The input end of any filter circuit is connected to a group of power terminals of the connector; the housing is provided with at least one threading hole, and the output of the filter circuit is connected to an output wire and led out of the housing through the threading hole; An insulator is installed along the edge of the threading hole.

2. The integrated filter plug according to claim 1, characterized in that: The filtering circuit includes a common mode inductor and a plurality of capacitors; The positive input terminal and negative input terminal of the common-mode inductor serve as the positive input terminal and negative input terminal of the filter circuit, respectively; the positive output terminal and negative output terminal of the common-mode inductor serve as the positive output terminal and negative output terminal of the filter circuit, respectively; a second capacitor and a third capacitor connected in series are connected between the positive input terminal and the negative input terminal of the common-mode inductor, a ground terminal is connected between the second capacitor and the third capacitor, and a first capacitor is connected in parallel at both ends of the second and third capacitors away from the ground; a fifth capacitor and a sixth capacitor connected in series are connected between the positive output terminal and the negative output terminal of the common-mode inductor, a ground terminal is connected between the fifth and sixth capacitors, a fourth capacitor is connected in parallel at both ends of the fifth and sixth capacitors away from the ground, and a seventh capacitor and an eighth capacitor connected in series are further connected in parallel at both ends of the fifth and sixth capacitors away from the ground, and a ground terminal is connected between the seventh and eighth capacitors.

3. The integrated filter plug according to claim 2, characterized in that: The capacitors are all multilayer ceramic chip capacitors.

4. The integrated filter plug according to any one of claims 1 to 3, characterized in that: At least one grounding terminal is provided between any two groups of the power connection terminals for connecting to the ground end of the filter circuit and isolating the two groups of signals.

5. The integrated filter plug according to claim 2 or 3, characterized in that: A polytetrafluoroethylene film is provided between the common mode inductor and the power filter circuit board; and a polytetrafluoroethylene film is provided between the power filter circuit board and the cover plate and the connector.

6. The integrated filter plug according to claim 1, characterized in that: One side of the housing is fixedly connected to the connector by screws, and a conductive pad is provided between the connector and the housing; The grounding ends of the plurality of filter circuits are connected in common via a conductive pad, and the conductive pad is in contact with a screw for grounding.

7. The integrated filter plug according to claim 6, characterized in that: A silicone layer for fixing is also provided at the connection between the shell and the connector.

8. The integrated filter plug according to claim 1, characterized in that: The output conductor is a silver-plated copper core polytetrafluoroethylene film wrapped insulated conductor.

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