CN109935947B

CN109935947B - Tubular filter

Info

Publication number: CN109935947B
Application number: CN201910194190.8A
Authority: CN
Inventors: 蒋忠益; 肖倩; 朱建华; 李金辉; 李凯文; 赵海霞; 王智会
Original assignee: Shenzhen Zhenhua Ferrite and Ceramic Electronics Co Ltd; China Zhenhua Group Science and Technology Co Ltd
Current assignee: Shenzhen Zhenhua Ferrite and Ceramic Electronics Co Ltd; China Zhenhua Group Science and Technology Co Ltd
Priority date: 2019-03-14
Filing date: 2019-03-14
Publication date: 2023-11-10
Anticipated expiration: 2039-03-14
Also published as: JP2020533780A; JP6865279B2; CN109935947A; WO2020034640A1

Abstract

The invention provides a tubular filter, which comprises a shell with a first end and a second end, a PCB capacitor component arranged in the shell, an inductor arranged in the shell, a first terminal arranged at the first end of the shell and a second terminal arranged at the second end of the shell, wherein the PCB capacitor component comprises a PCB integrated with a penetration capacitor and a patch capacitor arranged on the PCB. According to the tubular filter, the PCB integrated with the feedthrough capacitor is used, and the patch capacitor is arranged on the PCB to form the PCB capacitor assembly, so that the feedthrough capacitor is integrated in the PCB, the problem of capacitor short circuit failure caused by directly using the feedthrough capacitor is avoided, and meanwhile, the requirement of low insertion loss can be met.

Description

Tubular filter

Technical Field

The invention belongs to the field of filters, and particularly relates to a tubular filter.

Background

The tubular filter is a common filter form and has the advantages of compact structure, relatively large bandwidth and the like. For tubular filters operating in the frequency range of 10KHz-1GHz, ceramic feedthrough capacitors are typically used directly to achieve low insertion loss. However, the ceramic feedthrough capacitor in such filters is prone to short circuit failure.

Disclosure of Invention

The invention aims to provide a tubular filter so as to solve the problem that a ceramic feedthrough capacitor in the tubular filter in the prior art is easy to have short circuit failure.

In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a tubular filter, including having first end and second end's shell, locate PCB electric capacity subassembly in the shell, locate inductor in the shell, install in the first terminal of shell and install in the second terminal of shell, PCB electric capacity subassembly including integrate with the PCB board of punching electric capacity with install in paster electric capacity on the PCB board.

Further, the PCB is a multi-layer printed circuit board, and the multi-layer printed circuit board forms the feedthrough capacitor.

Further, a through hole is formed in the center of the PCB, a center electrode is arranged on the inner wall of the through hole, and a grounding electrode is arranged on the back of the PCB.

Further, the number of the grounding electrodes is two, and the two grounding electrodes are arranged along the periphery of the PCB in an extending mode.

Further, the front surface of the PCB is provided with a plurality of pairs of connecting electrodes for electrically connecting the patch capacitor.

Further, the patch capacitors are arranged on the PCB in pairs, and each pair of patch capacitors is arranged on the PCB in an annular array by taking the center of the PCB as a symmetry axis.

Further, a first insulating plate is arranged in the shell and is positioned on one surface of the inductor, which is close to the PCB capacitor assembly.

Further, a second insulating plate is arranged in the shell and is positioned on one surface of the inductor, which is away from the PCB capacitor assembly.

Further, a magnetic bead is arranged between the PCB capacitor assembly and the inductor.

Further, the shell is filled with a curing adhesive.

The tubular filter provided by the invention has the beneficial effects that: compared with the prior art, the tubular filter has the advantages that the PCB integrated with the feedthrough capacitor is used, and the patch capacitor is arranged on the PCB to form the PCB capacitor assembly, so that the feedthrough capacitor is integrated in the PCB, the capacitor short circuit failure problem caused by directly using the feedthrough capacitor is avoided, and meanwhile, the requirement of low insertion loss can be met.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic cross-sectional view of a tubular filter according to a first embodiment of the present invention;

fig. 2 is a schematic front view of a tubular filter according to a first embodiment of the present invention;

FIG. 3 is a schematic side view of the tubular filter of FIG. 2;

fig. 4 is a schematic diagram of a front view structure of a PCB board in a tubular filter according to a first embodiment of the present invention;

fig. 5 is a schematic view of a back view structure of a PCB board in a tubular filter according to a first embodiment of the present invention;

fig. 6 is a schematic structural diagram of a PCB capacitor assembly in a tubular filter according to an embodiment of the invention.

Fig. 7 is a schematic diagram of a front view structure of a PCB board in a tubular filter according to a second embodiment of the present invention.

Fig. 8 is a schematic diagram of a front view structure of a PCB board in a tubular filter according to a third embodiment of the present invention;

fig. 9 is a schematic structural diagram of a PCB capacitor assembly in a tubular filter according to a third embodiment of the present invention.

Fig. 10 is a schematic diagram of a front view structure of a PCB board in a tubular filter according to a fourth embodiment of the present invention;

fig. 11 is a schematic structural diagram of a PCB capacitor assembly in a tubular filter according to a fourth embodiment of the present invention.

Wherein, each reference numeral in the figure mainly marks:

a 100-tubular filter; 10-a housing; 11-cover plate; 12-supporting sleeve; 121-a second internal thread; 122-external threads; 123-lock nut; 13-first internal threads; 14-baffle ring; 141-ring grooves; 21-a first terminal; 211-a first insulating adhesive; 22-a second terminal; 221-a second insulating adhesive; a 23-inductor; 24-a first insulating plate; 25-a second insulating plate; 26-magnetic beads; 27-curing glue; a 30-PCB capacitive assembly; 31-a PCB board; 311-through holes; 312-a center electrode; 313-ground electrode; 314-connecting electrodes; 315-groove; 316-bonding pads; 32-patch capacitance.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The meaning of "a number" is one or more than one unless specifically defined otherwise.

In the description of the present invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

For convenience of explanation, the invention uses English as follows:

PCB (Printed Circuit Board) the Chinese name is printed circuit board, also called PCB board.

Embodiment one:

referring to fig. 1 and 2, a tubular filter 100 provided by the present invention will now be described. The tubular filter 100 includes a housing 10, a PCB capacitor assembly 30, an inductor 23, a first terminal 21, and a second terminal 22. The housing 10 has a first end and a second end, and the housing 10 has a receiving space therein for receiving the electronic device. The first terminal 21 and the second terminal 22 are respectively mounted at two ends of the housing 10, the first terminal 21 is led out from a first end of the housing 10, and the second terminal 22 is led out from a second end of the housing 10, namely: the first terminal 21 is mounted to a first end of the housing 10 and the second terminal 22 is mounted to a second end of the housing 10 for connection. The PCB capacitor assembly 30 and the inductor 23 are mounted in the housing 10 to support and protect the PCB capacitor assembly 30 and the inductor 23 through the housing 10. The PCB capacitor assembly 30 is electrically connected to the inductor 23 and is led out through the first terminal 21 and the second terminal 22 for use. Referring to fig. 4 to 6, the PCB capacitor assembly 30 includes a PCB board 31 with integrated feedthrough capacitors and chip capacitors 32 mounted on the PCB board 31. The feedthrough capacitor is integrated in the PCB 31 to avoid shorting the feedthrough capacitor, and the patch capacitor 32 is mounted on the PCB 31 to adjust the capacitance and capacitance characteristics, so that the PCB capacitor assembly 30 can achieve the insertion loss index of the ceramic feedthrough capacitor, i.e., achieve low insertion loss, and avoid shorting, thereby better avoiding the failure of the tubular filter 100.

Compared with the prior art, the tubular filter 100 provided by the invention has the advantages that the PCB 31 integrated with the feedthrough capacitor is used, and the patch capacitor 32 is arranged on the PCB 31 to form the PCB capacitor assembly 30, so that the feedthrough capacitor is integrated in the PCB 31, the capacitor short-circuit failure problem caused by directly using the feedthrough capacitor is avoided, and the requirement of low insertion loss can be met.

Further, referring to fig. 4 to 6, as a specific embodiment of the tubular filter 100 provided by the present invention, the PCB 31 is a multi-layer printed circuit board, and the multi-layer printed circuit board forms a feedthrough capacitor, that is, the feedthrough capacitor is formed simultaneously when the multi-layer printed circuit board is manufactured, that is, the feedthrough capacitor is manufactured by using the printed circuit board, so that the feedthrough capacitor is integrated into the PCB 31 to avoid a short circuit.

Further, referring to fig. 4 to 6, as a specific embodiment of the tubular filter 100 provided in the present invention, the printed circuit board is 5 layers, and in other embodiments, the printed circuit board may be 4 layers, 6 layers, 7 layers, or the like. Can be set according to the needs; of course, the greater the number of layers of the printed circuit board, the greater its capacitance.

Further, referring to fig. 4 to 6, as a specific embodiment of the tubular filter 100 provided by the present invention, a through hole 311 is provided at the center of the PCB 31, a center electrode 312 is provided on the inner wall of the through hole 311, and a ground electrode 313 is provided on the back surface of the PCB 31. So as to facilitate the connection and use of the PCB 31 and also facilitate the installation and fixation of the PCB 31.

Further, referring to fig. 4 to 6, as an embodiment of the tubular filter 100 provided by the present invention, the center electrode 312 extends to the front and back sides of the PCB 31 at the positions corresponding to the edges of the through hole 311, so as to facilitate soldering connection.

Further, referring to fig. 4 to 6, as a specific embodiment of the tubular filter 100 provided by the present invention, two ground electrodes 313 are provided, and two ground electrodes 313 are provided to extend along the periphery of the PCB 31, so as to increase the area of the ground electrodes 313, thereby not only facilitating grounding, but also reducing insertion loss.

Further, referring to fig. 4 to 6, as a specific embodiment of the tubular filter 100 provided by the present invention, two ground electrodes 313 are symmetrically distributed on two sides of the PCB 31, so as to reduce insertion loss, and facilitate design and manufacturing, and ground connection.

Further, referring to fig. 4 to 6, as a specific embodiment of the tubular filter 100 provided by the present invention, grooves 315 are formed on two sides of the periphery of the PCB 31, so that the grooves 315 can be used for mounting and fixing the PCB 31 when the PCB 31 is mounted, and at the same time, the wires can pass through conveniently. The two ends of each ground electrode 313 are extended to positions adjacent to the two grooves 315, respectively, so that the area of the ground electrode 313 is made larger, the ground use is facilitated, and the insertion loss is reduced.

Further, referring to fig. 4 to 6, as a specific embodiment of the tubular filter 100 provided by the present invention, each groove 315 has a circular arc shape, so as to reduce the internal edge angle of the PCB 31 and reduce the insertion loss.

Further, referring to fig. 4 to 6, as a specific embodiment of the tubular filter 100 provided by the present invention, the front surface of the PCB 31 is provided with a plurality of pairs of connection electrodes 314 for electrically connecting the chip capacitors 32. The connection electrodes 314 are provided in pairs so as to connect the two poles of the patch capacitor 32, respectively. And each pair of connecting electrodes 314 is disposed on the front surface of the PCB 31, so that the ground electrodes 313 are spaced apart to reduce mutual influence. Preferably, the patch capacitance 32 is a ceramic patch capacitance.

Further, referring to fig. 4 to 6, as a specific embodiment of the tubular filter 100 provided by the present invention, the patch capacitors 32 are disposed on the PCB 31 in pairs, and each pair of patch capacitors 32 is disposed on the PCB 31 in an annular array with the center of the PCB 31 as a symmetry axis, that is, two patch capacitors 32 in each pair are symmetrically disposed on two sides of the PCB 31, so as to ensure good symmetry of the capacitors and reduce insertion loss. In this embodiment, the PCB 31 is circular, and the two patch capacitors 32 in each pair are symmetrically distributed at two ends of the diameter of the PCB 31. Further, in the present embodiment, the patch capacitors 32 are two, i.e., the patch capacitors 32 are a pair.

In other embodiments, the patch capacitance 32 may be two pairs, three pairs, four pairs, etc. Of course, if the patch capacitors 32 are plural, the patch capacitors 32 are arranged on the PCB 31 in an annular array with the center of the PCB 31 as a symmetry axis, so as to perform a symmetrical layout better, facilitate design, and reduce insertion loss.

Further, referring to fig. 1 to 3, as an embodiment of the tubular filter 100 provided by the present invention, the PCB capacitor component 30 is located at the first end of the housing 10, and the inductor 23 is located at the second end of the housing 10, so as to facilitate layout of the PCB capacitor component 30 and the inductor 23, and reduce the volume of the manufactured tubular filter 100.

Further, referring to fig. 1 to 3, as an embodiment of the tubular filter 100 provided by the present invention, the housing 10 has a circular tube shape, so as to manufacture a cylindrical filter. The PCB 31 is circular to fully utilize the space in the housing 10 to fix the PCB 31.

Further, referring to fig. 1 to 3, as an embodiment of the tubular filter 100 provided in the present invention, a first insulating plate 24 is disposed in the housing 10, and the first insulating plate 24 is located on a side of the inductor 23 near the PCB capacitor assembly 30. The arrangement of the first insulating plate 24 can better prevent electromagnetic interference between the PCB capacitor assembly 30 and the inductor 23, reduce insertion loss, and prevent the PCB capacitor assembly 30 from shorting, thereby improving the stability of the tubular filter 100.

Further, referring to fig. 1 to 3, as an embodiment of the tubular filter 100 provided in the present invention, a second insulating plate 25 is disposed in the housing 10, and the second insulating plate 25 is located on a side of the inductor 23 facing away from the PCB capacitor assembly 30. The provision of the second insulating plate 25 can reduce the influence of the outside on the inductor 23, and can better protect the inductor 23. Further, the first insulating plate 24 and the second insulating plate 25 are respectively disposed on two sides of the inductor 23, so that the inductor 23 can be better protected.

Further, referring to fig. 1, as a specific embodiment of the tubular filter 100 provided by the present invention, a magnetic bead 26 is disposed between the PCB capacitor component 30 and the inductor 23, and the magnetic bead 26 is disposed to better suppress high frequency noise and spike interference, absorb electrostatic pulses, and reduce insertion loss. Further, the magnetic beads 26 are located at the center of the PCB 31. To facilitate the installation of the magnetic beads 26 and also to facilitate the positioning of the magnetic beads 26. Still further, the magnetic beads 26 bottom against the first insulating plate 24 to fully utilize the space in the housing 10, reduce the volume, and better separate the PCB capacitor assembly 30 from the inductor 23, and reduce the electromagnetic interference effect between the PCB capacitor assembly 30 and the inductor 23.

Further, referring to fig. 1, as an embodiment of the tubular filter 100 provided by the present invention, the housing 10 is filled with a curing adhesive 27. The shell 10 is filled with the curing glue 27, so that the PCB 31, the patch capacitor 32 and the inductor 23 are wrapped through the curing glue 27 to be cured into an integrated structure, and the integrated structure is not contacted with a tube shell, so that the stress generated by the tests such as warm punching, random vibration, high-frequency vibration, low-frequency vibration, impact and the like is borne by the PCB 31 at first, thereby achieving the purpose of protecting the capacitor and improving the stability and the reliability. Preferably, the curing glue 27 may be an a/B glue. Of course, the curing agent may be other glue, such as epoxy glue.

Further, referring to fig. 1, as a specific embodiment of the tubular filter 100 provided by the present invention, the housing 10 is a metal shell, so as to improve the strength of the housing 10, and at the same time, can shield the influence of the outside on the electronic devices in the housing 10, and reduce the insertion loss. In addition, the casing 10 is a metal casing, and the grounding electrode 313 on the PCB 31 can be electrically connected with the casing 10 to perform grounding better.

Further, referring to fig. 1, as an embodiment of the tubular filter 100 provided by the present invention, the first terminal 21 is located in a middle area of the first end of the housing 10, and a first insulating adhesive 211 is filled between an inner wall of the first end of the housing 10 and the first terminal 21 so as to support the first terminal 21. The first insulating adhesive 211 may be G500 adhesive, or may be other adhesive, such as epoxy adhesive.

Further, referring to fig. 1, as an embodiment of the tubular filter 100 provided by the present invention, the inner surface of the first end of the housing 10 is provided with the first internal thread 13, and since the first insulating glue 211 is filled between the inner wall of the first end and the first terminal 21, the inner surface of the first end of the housing 10 is provided with the first internal thread 13, and the first insulating glue 211 is better fixed and prevented from falling off due to the first internal thread 13 being filled with the first insulating glue.

Further, referring to fig. 1, as an embodiment of the tubular filter 100 provided by the present invention, a retaining ring 14 is disposed at a first end of the housing 10, and an outer side surface of the retaining ring 14 is connected to an inner surface of the housing 10, so that the first insulating adhesive 211 can be stopped by the retaining ring 14, so as to better prevent the first insulating adhesive 211 from falling off, and further better support the first terminal 21.

Further, referring to fig. 1, as an embodiment of the tubular filter 100 provided by the present invention, the ring groove 141 is formed on the inner side surface of the baffle ring 14, so that the first insulating adhesive 211 fills the ring groove 141 to better fix the first insulating adhesive 211.

Further, referring to fig. 1 to 3, as a specific embodiment of the tubular filter 100 provided by the present invention, the second end of the housing 10 has a cover plate 11, the center of the cover plate 11 is provided with a supporting sleeve 12, the second terminal 22 is supported in the supporting sleeve 12, and the second end of the housing 10 is provided with the cover plate 11, so that the electronic device can be better positioned during assembly. As in the present embodiment, the inductor 23 can be positioned conveniently, and other electronic devices can be positioned. The support sleeve 12 is arranged at the center of the cover plate 11, and the second terminal 22 is supported in the support sleeve 12 to better support the second terminal 22.

Further, referring to fig. 1 to 3, as an embodiment of the tubular filter 100 provided by the present invention, the second terminal 22 is located at the center of the supporting sleeve 12, and a second insulating glue 221 is filled between the second terminal 22 and the inner wall of the supporting sleeve 12. The second insulating paste 221 is provided to better support the second terminal 22, and can better insulate the second terminal 22. The second insulating adhesive 221 may be a G500 adhesive, or may be other adhesives, such as an epoxy adhesive.

Further, referring to fig. 1 to 3, as an embodiment of the tubular filter 100 provided by the present invention, the second internal thread 121 is provided in the supporting sleeve 12, and the second insulating glue 221 is filled between the second terminal 22 and the inner wall of the supporting sleeve 12, so that the second insulating glue 221 fills the second internal thread 121, and further the second insulating glue 221 can be prevented from falling off.

Further, referring to fig. 1 to 3, as an embodiment of the tubular filter 100 provided by the present invention, the support sleeve 12 is provided with external threads 122 for easy installation and fixing, and thus easy use. Further, a lock nut 123 is mounted on the support sleeve 12 to lock when mounted and fixed.

Further, referring to fig. 1 to 3, as an embodiment of the tubular filter 100 provided by the present invention, the cover plate 11 and the support sleeve 12 are integrally formed with the housing 10, so as to facilitate processing and manufacturing, and increase strength.

Through testing, the tubular filter 100 of the embodiment can reach the level of using ceramic feedthrough capacitance from the insertion loss index of the frequency range of 10KHz-1GHz, realize integral encapsulation, improve the reliability of products and reduce the cost of the products. And can realize the whole embedment of tubular filter 100, terminal anti-rotation, prevent dialling, improve tubular filter 100 anti-vibration, shock resistance, avoid the short circuit failure problem that directly use ceramic core capacitor to appear, improve the reliability of product, satisfy the test requirement of GJB1518A-2015 and GJB 360B.

Embodiment two:

referring to fig. 7, the tubular filter of the present embodiment is different from the tubular filter of the first embodiment in that:

in this embodiment, the front surface of the PCB 31 is set to be 6 pairs of connection electrodes 314, and then 6 patch capacitors 32 are required to be mounted on the PCB 31. Further, the 6 patch capacitors 32 are arranged in an annular array with the central axis of the PCB 31 as a symmetry axis.

The other structures of the tubular filter of the present embodiment are the same as those of the tubular filter of the first embodiment, and will not be described here again.

Embodiment III:

referring to fig. 8 and 9, the tubular filter of the present embodiment is different from the tubular filter of the first embodiment in that:

in this embodiment, the front surface of the PCB 31 is set to 4 pairs of connection electrodes 314, and then 4 patch capacitors 32 are required to be mounted on the PCB 31. Further, the 4 patch capacitors 32 are arranged in an annular array with the central axis of the PCB 31 as a symmetry axis.

Embodiment four:

referring to fig. 10 and 11, the tubular filter of the present embodiment is different from the tubular filter of the first embodiment in that:

Further, a space region is provided between two adjacent pairs of connection electrodes 314, and 6 pairs of connection electrodes 314 form 6 space regions on the front surface of the PCB 31, two grooves 315 are respectively located in two opposite space regions, and pads 316 are respectively disposed on the other 4 space regions, so as to facilitate circuit connection.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. Tubular filter, its characterized in that: the PCB capacitor assembly comprises a PCB board integrated with a through capacitor and a patch capacitor arranged on the PCB board;

the PCB is a multilayer printed circuit board, and the multilayer printed circuit board forms the through capacitor;

the center of the PCB is provided with a through hole, the inner wall of the through hole is provided with a center electrode, the back of the PCB is provided with a grounding electrode, and the center electrode extends to positions corresponding to the edges of the through hole on the front and back of the PCB;

the number of the grounding electrodes is two, and the two grounding electrodes are arranged along the periphery of the PCB in an extending mode.

2. The tubular filter of claim 1, wherein: the front of the PCB is provided with a plurality of pairs of connecting electrodes for electrically connecting the patch capacitor.

3. The tubular filter of claim 2, wherein: the patch capacitors are arranged on the PCB in pairs, and each pair of patch capacitors is arranged on the PCB in an annular array by taking the center of the PCB as a symmetry axis.

4. The tubular filter of claim 1, wherein: a first insulating plate is arranged in the shell and is positioned on one surface of the inductor, which is close to the PCB capacitor assembly.

5. The tubular filter of claim 1, wherein: the shell is internally provided with a second insulating plate, and the second insulating plate is positioned on one surface of the inductor, which is away from the PCB capacitor assembly.

6. The tubular filter of claim 1, wherein: and magnetic beads are arranged between the PCB capacitor assembly and the inductor.

7. The tubular filter of claim 1, wherein: the shell is filled with curing glue.