A plate array inductor, a method of manufacturing the same, and a filter connector

Abstract

The present application relates to a kind of plate array inductor, its preparation method and filter connector.The plate array inductor is plate ferrite base including at least one signal hole, the outer periphery of signal hole is provided with a plurality of sequentially connected turn loop electrode, and a plurality of sequentially connected turn loop electrode is distributed in ferrite base in spiral shape.A plurality of sequentially connected turn loop electrode penetrates ferrite base, and is connected with the end electrode arranged at the two ends of signal hole respectively.The turn loop electrode in the present application is equivalent to the coil arranged outside the ferrite core, not only can set the number of turn loop electrode according to need, increase the inductance of inductor, but also can reduce the volume of inductor, so that it can be installed and used in the internal space of narrow electric connector.In addition, the present application also integrates a plurality of inductors, so that it can be installed and used in the internal space of arrayed electric connector, and is used for a plurality of filter circuits.

Description

Technical Field

[0001] The present invention belongs to the technical field of filter connectors, and specifically relates to a plate-type array inductor, a preparation method thereof, and a filter connector. Background Art

[0002] A plate-type array capacitor is a product matched with filter connectors, and mainly filters out clutter in power supplies or transmission signals. As a core component of filter connectors, plate-type array capacitors have been widely used in aviation, electronics and other fields. With the continuous expansion of the application scope of filter connectors, they have evolved from initially meeting basic filtering requirements to satisfying the electromagnetic compatibility requirements of weapons and equipment, and from local design to electromagnetic compatibility planning of the whole machine system. The filtering composition has also developed from the original single C-type filtering using only plate-type array capacitors to LC and π-type filtering circuits combining capacitors and inductors, and accordingly, plate-type array magnetic cores have emerged as required.

[0003] Filter connectors commonly use plate-type array magnetic cores and plate-type array capacitors for combined filtering. The magnetic core and the connector signal contact pin passing through its hole form a single-turn inductor connected in series with the signal transmission line. The inductance of this single-turn inductor is very small, and for L-C combined filtering circuits, its filtering characteristics sometimes cannot easily meet the design requirements. However, if an inductor with a larger inductance is used to enable the filter connector to achieve the corresponding filtering characteristics, there is greater design space. In addition, traditional wire-wound inductors have the disadvantages of large size and being bulky, and are not suitable for being installed in the integrated, arrayed and narrow internal space of electrical connectors.

[0004] Therefore, it is necessary to provide an inductor with larger inductance and a more compact structure. Summary of the Invention

[0005] (1) Technical Problem to be Solved

[0006] To solve the problems of insufficient inductance and bulky size of inductors in the prior art, the present invention provides a plate-type array inductor, a preparation method thereof, and a filter connector.

[0007] (2) Technical Solution

[0008] To achieve the above objective, the main technical solution adopted by the present invention is as follows:

[0009] In a first aspect, the present invention provides a plate-type array inductor, comprising a ferrite substrate, wherein at least one signal hole is provided on the ferrite substrate;

[0010] A plurality of sequentially connected turn-ring electrodes are provided on the outer periphery of the signal hole, and the plurality of sequentially connected turn-ring electrodes are spirally distributed in the ferrite substrate;

[0011] Multiple sequentially connected ring electrodes penetrate the ferrite matrix and are respectively connected to the end electrodes disposed at both ends of the signal hole.

[0012] In the plate array inductor described above, preferably, the ring electrode includes a first sheet-shaped arc electrode, a second sheet-shaped arc electrode, and a first connecting electrode for connecting the first sheet-shaped arc electrode and the second sheet-shaped arc electrode.

[0013] In the same ring electrode, the first plate-shaped arc electrode and the second plate-shaped arc electrode are arranged around the signal hole at least once;

[0014] In adjacent ring electrodes, a first plate-shaped arc electrode and a second plate-shaped arc electrode located at adjacent positions surround the signal hole at least once;

[0015] The first connecting electrode is disposed in a first guide hole opened on the ferrite substrate, and adjacent ring electrodes are connected through the first connecting electrode.

[0016] The first or second plate-shaped arc electrode located at both ends of the ring electrode is connected to the end electrode through a second connecting electrode, which is disposed in a second guide hole opened on the ferrite substrate.

[0017] In the plate array inductor described above, preferably, both the first plate-shaped arc electrode and the second plate-shaped arc electrode are semi-circular arc-shaped.

[0018] The first sheet-shaped arc electrode, the second sheet-shaped arc electrode, the first connecting electrode, and the second connecting electrode are palladium-silver alloys or copper alloys.

[0019] In the plate array inductor described above, preferably, the inductor substrate ferrite substrate is made of soft magnetic ferrite material.

[0020] In the plate array inductor described above, preferably, the soft magnetic ferrite material is manganese zinc ferrite or nickel zinc ferrite.

[0021] In the plate array inductor described above, preferably, the terminal electrodes are terminal pads disposed at both ends of the signal hole.

[0022] Secondly, the present invention provides a method for fabricating the above-mentioned plate array inductor, comprising the following steps:

[0023] S1: At least one signal hole is opened on the magnetic film, and electrode paste is printed on the first magnetic film and the second magnetic film, so that the electrode paste forms a first sheet-shaped arc electrode and a second sheet-shaped arc electrode on the outer periphery of the signal hole, respectively.

[0024] S2: Drill holes in the magnetic film and fill them with electrode paste to form connecting electrodes;

[0025] S3: The first magnetic film and the second magnetic film are stacked alternately in sequence, so that the connecting electrode is located between the first sheet-shaped arc electrode and the second sheet-shaped arc electrode, and is in contact with the first sheet-shaped arc electrode and the second sheet-shaped arc electrode respectively. Multiple first sheet-shaped arc electrodes, multiple connecting electrodes and multiple second sheet-shaped arc electrodes are spirally distributed to form a prefabricated plate array inductor.

[0026] S4: Press the prefabricated plate array inductor and then sinter it to obtain the plate array inductor.

[0027] In the above-described method for fabricating a plate array inductor, preferably, in step S4, the sintering temperature is 800℃-1200℃ and the sintering time is 3h-4h.

[0028] Thirdly, the present invention also provides a filter connector, including the above-mentioned plate array inductor.

[0029] (III) Beneficial Effects

[0030] The beneficial effects of this invention are:

[0031] First, in this invention, multiple ring electrodes connected sequentially and spirally distributed in the ferrite matrix are equivalent to coils wound around the outside of the ferrite core. This invention replaces the function of coils with ring electrodes, and the number of ring electrodes can be set as needed to increase the inductance of the inductor to meet the design requirements.

[0032] Secondly, the present invention uses a toroidal electrode instead of a coil, which makes the inductor smaller and more streamlined, and can be installed and used in the internal space of an integrated, small electrical connector.

[0033] Third, in this invention, a signal hole and its surrounding ring electrode constitute an inductor. This invention enables multiple inductors to be distributed in an array on a ferrite substrate, integrating multiple inductors and installing them in the internal space of the arrayed electrical connector, while also serving multiple filter circuits. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the plate array inductor in this invention;

[0035] Figure 2 This is an external view of the plate array inductor in this invention;

[0036] Figure 3 This is a partial cross-sectional view of the area around the signal hole in this invention (when the section line is perpendicular to the extension direction of the signal hole);

[0037] Figure 4 This is a partial cross-sectional view of the area around the signal hole from another angle in this invention (when the section line is parallel to the cross-sectional direction of the signal hole).

[0038] [Explanation of Labels in the Attached Image]

[0039] 1: Ferrite substrate; 2: Signal hole; 3: End pad; 4: First sheet-shaped arc electrode; 5: Second sheet-shaped arc electrode; 6: First connecting electrode; 7: First via; 8: Second via; 9: First identification hole; 10: Second identification hole; 11: Third identification hole. Detailed Implementation

[0040] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] like Figure 1-4 As shown, this embodiment provides a plate array inductor, including a ferrite substrate 1, on which at least one signal hole 2 is formed. Figure 1 As shown, multiple sequentially connected ring electrodes are arranged around the outer periphery of the signal hole 2, and these ring electrodes are spirally distributed within the ferrite substrate 1. In this embodiment, the spirally distributed ring electrodes are equivalent to the coils located outside the magnetic core in existing inductors. This embodiment uses ring electrodes to replace the function of the coils. In practical applications, the number of ring electrodes can be set according to circuit requirements to increase the inductance of the inductor and meet design requirements. The multiple sequentially connected ring electrodes penetrate the ferrite substrate 1 and are respectively connected to end electrodes located at the upper and lower ends of the signal hole 2. The end electrodes are specifically located on the ferrite substrate 1.

[0043] In this embodiment, replacing the coil with a toroidal electrode allows for a smaller inductor size and a more streamlined structure, enabling installation and use within the compact internal space of integrated electrical connectors. Furthermore, this embodiment features multiple signal vias on the same ferrite substrate. The size and position of these signal vias can be arbitrarily set as needed, and are not limited to identical sizes or fixed arrangements. Each signal via and its surrounding toroidal electrode constitutes an inductor. This embodiment allows for the integration of multiple inductors arranged in an array on the same ferrite substrate, enabling their installation and use within the internal space of an arrayed electrical connector, and simultaneous application in multiple filtering circuits. The plate-type array inductor of this embodiment can be directly used in filtering circuits, eliminating the need for a combination structure of a magnetic core and a plate-type array capacitor.

[0044] In this embodiment, the ferrite matrix 1 is preferably a soft magnetic ferrite material, such as manganese zinc ferrite, nickel zinc ferrite, etc. The overall shape of the ferrite matrix 1 is not limited to... Figure 1-2 The cylindrical shape shown can also be designed into any other shape depending on the actual situation.

[0045] like Figure 1 As shown, this embodiment also provides orientation marking holes on the outer circumference of the ferrite substrate 1, specifically including a first marking hole 9, a second marking hole 10, and a third marking hole 11. The line connecting the center of the first marking hole 9 to the center of the ferrite substrate 1 is taken as line L1, the line connecting the center of the second marking hole 4 to the center of the ferrite substrate 1 is taken as line L2, and the line connecting the center of the third marking hole 5 to the center of the ferrite substrate 1 is taken as line L3. The angle between L1 and L2 is a suitable angle, and the angle between L1 and L3 can be any other suitable angle. This allows the orientation of the plate array inductor to be marked, facilitating its later assembly and use.

[0046] The upper and lower ends of the ring electrode are led out through the two end faces of the signal hole and connected to the end electrode. In this embodiment, the end electrode is an end pad set on the outer surface of the ferrite substrate 1. The end pad is exposed outside the plate array ferrite substrate and distributed around the signal hole. It is used to connect with the filter circuit in the filter connector to form a closed loop and realize the filtering function of the inductor.

[0047] The ring electrode in this embodiment includes a first sheet-like arc electrode 4, a second sheet-like arc electrode 5, and a first connecting electrode 6 for connecting the first sheet-like arc electrode 4 and the second sheet-like arc electrode 5. The first connecting electrode 6 is disposed within a first guide hole 7 opened on the ferrite substrate 1. In the same ring electrode, the first sheet-like arc electrode 4 and the second sheet-like arc electrode 5 are wound around the signal hole 2 at least once to ensure that the first sheet-like arc electrode 4 and the second sheet-like arc electrode 5 can form a complete turn, which is equivalent to a coil, i.e., a spiral. In adjacent ring electrodes, the first sheet-like arc electrode 4 and the second sheet-like arc electrode 5 in adjacent positions are also wound around the signal hole 2 at least once to ensure the integrity of the next turn, forming the next spiral, and this structure is repeated continuously until the required inductance is met. Similarly, adjacent ring electrodes are also connected by the first connecting electrode.

[0048] The first or second plate-shaped arc-shaped electrode 4, located at both ends of the ring electrode, is connected to the end electrode via a second connecting electrode 8, which is disposed within a second guide hole 8 formed in the ferrite substrate 1. The first and second guide holes 7 and 8 can be cylindrical in shape and identical in size. Similarly, the first and second connecting electrodes 6 and 8 can also be identical in shape and size.

[0049] The first sheet-shaped arc electrode 4 and the second sheet-shaped arc electrode 5 can be either superior or inferior arcs. To facilitate the fabrication process, the first sheet-shaped arc electrode 4 and the second sheet-shaped arc electrode 5 are preferably semi-circular arcs. The first sheet-shaped arc electrode 4 and the second sheet-shaped arc electrode 5 are flat sheets, forming an overall semi-circular arc strip.

[0050] Preferably, in order to ensure that the electrode can match the co-sintering temperature of the ferrite, the first sheet-shaped arc electrode 4, the second sheet-shaped arc electrode 5, the first connecting electrode 6 and the second connecting electrode are palladium-silver alloy or copper alloy.

[0051] Example 2

[0052] This embodiment provides a method for fabricating a plate array inductor according to Embodiment 1, comprising the following steps:

[0053] S1: A magnetic material, specifically ferrite, is cast into a magnetic film of a certain thickness using a casting method, or a ferrite paste is overlaid into a magnetic film of a certain thickness using a screen printing method. Then, at least one signal hole is formed on the magnetic film. Electrode paste is printed onto the same first and second magnetic films, so that the electrode paste forms surface electrode patterns on the outer periphery of the signal hole, specifically a first sheet-like arc-shaped electrode and a second sheet-like arc-shaped electrode.

[0054] S2: Drill holes in the magnetic film and fill them with electrode paste to form a connecting electrode.

[0055] S3: The first and second magnetically generated films are stacked alternately and sequentially, with multiple layers of the first and second magnetically generated films stacked precisely and orderly as needed. This alternating and precise stacking ensures that the connecting electrodes are positioned between the first and second sheet-like arc-shaped electrodes, respectively, and in contact with them. Multiple first sheet-like arc-shaped electrodes, multiple connecting electrodes, and multiple second sheet-like arc-shaped electrodes are arranged in a spiral pattern. The uppermost and lowermost magnetically generated films are connected to the terminal electrodes via the connecting electrodes filled on them. After stacking, a prefabricated plate array inductor is formed.

[0056] S4: Press the prefabricated plate array inductor together, and then sinter it at 800℃-1200℃ for 3h-4h using LTCC low temperature co-firing technology to obtain the plate array inductor.

[0057] The above sintering is a co-firing process of the magnetic film and the electrode. After sintering, the multilayer magnetic films are combined into one, the sheet-like arc-shaped electrode and the connecting electrode are combined into one, and the magnetic film and the electrode are connected together as a whole. The sheet-like arc-shaped electrode inside the ferrite body, the lead-out ends on both sides of the ferrite matrix and the adjacent internal sheet-like arc-shaped electrodes are electrically connected through the guide holes, forming an inductor circuit layout centered on the signal holes in the plate plane. The electrodes are led out from both ends of the signal holes, thus realizing the function of the inductor.

[0058] Example 3

[0059] This embodiment provides a filter connector, including the plate array inductor in embodiment 1.

[0060] In this invention, an alloy with a sintering temperature matching that of the magnetic material is used as the internal electrode through LTCC (Low Temperature Co-firing) technology. Through circuit design, within the limited space around the signal holes, sheet-like arc-shaped electrodes are spread out in the plane of the layer. Then, by longitudinally filling the holes with connecting electrodes, the sheet-like arc-shaped electrodes of adjacent layers are connected, thus forming a ring-shaped electrode layout in the ferrite matrix. As the number of such stacked structures increases, a multi-turn electrode layout is formed in the ferrite matrix. This multi-turn electrode distribution is equivalent to forming a wire-wound inductor with a ferrite core. The internal sheet-like arc-shaped electrodes and connecting electrodes of the inductor are distributed in the space surrounding the signal holes. The leads of the connecting electrodes are respectively located on the two end faces of the signal holes, leading out from the end pads around the signal holes. Thus, each signal hole is equivalent to an independent inductor, and the array board integrating multiple signal holes forms a plate-type array multilayer inductor integrating multiple inductors.

[0061] This invention creates a multi-layer plate array inductor by co-firing electrodes inside a plate array magnetic core. The inductance of the inductor can be pre-designed and calculated, and manufactured using controlled processes. Specifically, based on the formula for calculating solenoid inductance, the internal solenoid circuit layout is used to optimize the number of turns and length of the coil, select the best magnetic material to determine the optimal permeability parameters, and ultimately achieve independent inductance parameter design.

[0062]

[0063] Where: L is the inductance, in H; k is the Nagaoka coefficient; μ is the material permeability, in H / m; S is the cross-sectional area of ​​the coil, in m². 2 N is the number of coil turns; l is the coil length in meters.

[0064] This invention combines metal electrodes with magnetic core materials to achieve low-temperature co-firing of the two. Through structural design and integrated layout technology, the inductor layout is arrayed and integrated, enabling independent signal transmission and processing, meeting the functional requirements of filter connectors. It also uses interlayer guiding method to achieve outward lead-out of the inductor.

[0065] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A plate array inductor, characterized by, It includes a ferrite matrix (1), on which at least one signal hole (2) is formed. Multiple sequentially connected ring electrodes are provided on the outer periphery of the signal hole (2), and the multiple sequentially connected ring electrodes are spirally distributed in the ferrite matrix (1); Multiple sequentially connected ring electrodes penetrate the ferrite matrix (1) and are respectively connected to the end electrodes disposed at both ends of the signal hole (2); The ring electrode includes a first sheet-shaped arc electrode (4), a second sheet-shaped arc electrode (5), and a first connecting electrode (6) for connecting the first sheet-shaped arc electrode (4) and the second sheet-shaped arc electrode (5). In the same ring electrode, the first sheet-shaped arc electrode (4) and the second sheet-shaped arc electrode (5) are arranged around the signal hole (2) at least once; In adjacent ring electrodes, the first sheet-like arc electrode (4) and the second sheet-like arc electrode (5) located at adjacent positions surround the signal hole (2) at least once; The first connecting electrode (6) is disposed in the first guide hole (7) opened on the ferrite substrate (1), and adjacent ring electrodes are connected through the first connecting electrode. The first sheet-shaped arc electrode (4) or the second sheet-shaped arc electrode (5) located at both ends of the ring electrode are connected to the end electrode through the second connecting electrode, which is disposed in the second guide hole (8) opened on the ferrite substrate (1); Both the first sheet-shaped arc electrode (4) and the second sheet-shaped arc electrode (5) are semi-circular arc-shaped; The first sheet-shaped arc electrode (4), the second sheet-shaped arc electrode (5), the first connecting electrode (6), and the second connecting electrode are palladium-silver alloys or copper alloys; The fabrication method of the plate array inductor includes the following steps: S1: At least one signal hole is opened on the magnetic film, and electrode paste is printed on the first magnetic film and the second magnetic film, so that the electrode paste forms a first sheet-shaped arc electrode and a second sheet-shaped arc electrode on the outer periphery of the signal hole, respectively. S2: Drill holes in the magnetic film and fill them with electrode paste to form connecting electrodes; S3: The first magnetic film and the second magnetic film are stacked alternately in sequence, so that the connecting electrode is located between the first sheet-shaped arc electrode and the second sheet-shaped arc electrode, and is in contact with the first sheet-shaped arc electrode and the second sheet-shaped arc electrode respectively. Multiple first sheet-shaped arc electrodes, multiple connecting electrodes and multiple second sheet-shaped arc electrodes are spirally distributed to form a prefabricated plate array inductor. S4: Press the prefabricated plate array inductor and then sinter it to obtain the plate array inductor; after sintering, the multilayer magnetic films are combined into one, the sheet-shaped arc electrode and the connecting electrode are combined into one, and the magnetic film and the electrode are connected together as a whole.

2. The plate array inductor of claim 1, wherein, The ferrite matrix (1) is made of soft magnetic ferrite material.

3. The plate array inductor according to claim 2, characterized in that, The soft magnetic ferrite material is either manganese zinc ferrite or nickel zinc ferrite.

4. The plate array inductor according to claim 1, characterized in that, The end electrodes are end pads (3) located at both ends of the signal hole (2).

5. The plate array inductor according to claim 1, characterized in that, In step S4, the sintering temperature is 800℃-1200℃ and the sintering time is 3h-4h.

6. A filter connector, characterized in that, Includes the plate array inductor as described in any one of claims 1-4.

Images