Inductive, low-pass filter circuit unit and low-pass filter circuit structure

Abstract

The present application relates to a kind of inductance, low-pass filter circuit unit and low-pass filter circuit structure, including two circuit boards, at least one conductive unit is arranged on each circuit board, the group of conductive unit is symmetrically arranged on the two sides of each circuit board, at least two conductive holes are arranged on each conductive unit, each first conductive unit on the first circuit board is arranged with each second conductive unit on the second circuit board, and each first conductive unit and each second conductive unit on the two circuit boards are sequentially connected together by a plurality of conductive columns through each conductive hole, form inductance, first capacitor is arranged on the first circuit board, the first conductive plate is connected between the first end of the first capacitor and the first first conductive unit, the second end of the first capacitor is connected with the last second conductive unit by conductive column, and low-pass filter circuit unit is formed, multiple low-pass filter circuit units are connected in series to form filter circuit, improve performance, reduce size.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic communication technology, in particular to an inductor, a low-pass filter circuit unit and a low-pass filter circuit structure. BACKGROUND

[0002] In the field of medium wave, short wave and ultra-short wave high-power communication, LC low-pass filter circuits are often used for filtering. In all-solid-state communication and radar transmitters, LC lumped parameter filters are commonly used as output stages for filtering out the second, third and higher harmonics generated by power amplifiers.

[0003] Traditional high-power LC lumped parameter filters mainly use high-power inductors and high-power capacitors. Since they need to withstand several kilowatts or even tens of kilowatts of power, high-power inductors are usually air-core inductors made of metal tubes, resulting in a large size of the filter.

[0004] With the development of technology, there is an increasing demand for miniaturization of high-power filters. How to reduce the size of high-power filters is a problem that needs to be solved. SUMMARY

[0005] The present application aims to provide an inductor, a low-pass filter circuit unit and a low-pass filter circuit structure. Conductive units are arranged on two circuit boards, and the conductive units on the two circuit boards are connected in sequence by conductive columns to form an inductor. The inductor and the first capacitor are connected in parallel through a cross-connection conductive plate. A second capacitor is arranged between the connection point of the adjacent inductor and the ground, thereby realizing the LC filter circuit arrangement. The conductive units on the circuit board and the conductive columns form a high-power inductor. The cross-connection conductive plate is arranged between the two circuit boards. Power capacitors are arranged at the input and output ends, greatly reducing the size of the filter and reducing the cost.

[0006] In the first aspect, the above invention purpose of the present application is realized by the following technical scheme:

[0007] An inductor structure includes two circuit boards, each of which is provided with a group of conductive units, including at least one conductive unit. The conductive unit group is symmetrically arranged on both sides of each circuit board. At least two conductive holes are arranged on each conductive unit. The first conductive units on the first circuit board are arranged in a staggered manner with the second conductive units on the second circuit board. A plurality of conductive columns connect the first conductive units and the second conductive units on the two circuit boards in sequence through the conductive holes to form an inductor.

[0008] The present application further provides that the first conductive units are arranged in parallel, the second conductive units are arranged in parallel, and the conductive units on the same circuit board are provided with a through hole. The through hole penetrates the front and back surfaces of the circuit board.

[0009] The application is further configured that the first and second conductive units are rectangular structures, when the first and second circuit boards overlap, the first edge of the i-th first conductive unit is overlapped with the first edge of the j-th second conductive unit on the second circuit board, the k-th conductive column is connected with the first conductive hole on the i-th first conductive unit and the first conductive hole on the j-th second conductive unit, the third edge of the i-th first conductive unit is staggered with the third edge of the j-th second conductive unit on the second circuit board; the third edge of the i+1-th first conductive unit is overlapped with the third edge of the j-th second conductive unit on the second circuit board, the k+1-th conductive column is connected with the second conductive hole on the i+1-th first conductive unit and the second conductive hole on the j-th second conductive unit, the first and second conductive units are connected in sequence to form an inductor; the first edge of each conductive unit is opposite to the third edge thereof, wherein i, j and k are positive integers greater than or equal to 1.

[0010] The application is further configured that a cross unit is arranged on the first circuit board, the cross unit is located between the last first conductive unit and the previous first conductive unit, and is used for connecting the cross conductive plate and the first capacitor.

[0011] The application is further configured that the last second conductive unit on the second circuit board comprises an extension segment, which is used for enabling the last second conductive unit to be connected to the last first conductive unit on the first circuit board through the conductive column.

[0012] The application is further configured that the extension segment extends along the distribution direction of the second conductive unit, the last second conductive unit is in an L-shaped structure, a grounding unit is arranged on one side of the L-shaped structure, and the second capacitor is connected between the second conductive unit and the grounding unit.

[0013] In the second aspect, the above application object is achieved by the following technical scheme.

[0014] A low-pass filter circuit unit structure comprises two circuit boards, the inductor is arranged, the first capacitor is arranged on the first circuit board, the cross conductive plate is arranged between the first conductive unit and the first end of the first capacitor, and the first conductive unit is used as the first lead-out end of the low-pass filter circuit; the second end of the first capacitor is connected with the last second conductive unit through the conductive column, and the second conductive unit is used as the second lead-out end of the low-pass filter circuit, thereby forming the low-pass filter circuit unit.

[0015] The application is further configured to further comprise a second capacitor, the second capacitor is arranged on the second circuit board, the first end of the second capacitor is connected with the second end of the low-pass filter circuit unit, the second end of the second capacitor is connected with the ground lead-out end on the second circuit board; and the cross conductive plate is located between the two circuit boards.

[0016] In a third aspect, the above object of the present application is achieved by the following technical solutions:

[0017] The low-pass filter circuit structure comprises at least one inductor as described in the present application, a third capacitor is arranged between the connecting point of two adjacent inductors and the ground, a cross-connection unit and a cross-connection conductive plate are arranged between the two lead-out ends of at least one inductor, the first end of the cross-connection conductive plate is connected to the first end of the inductor, the second end of the cross-connection conductive plate is connected to the first end of the cross-connection unit and the first end of the first capacitor, and the second end of the first capacitor is connected to the second end of the inductor.

[0018] The present application is further provided with an input capacitor arranged at the input end of the first inductor, the input capacitor is arranged at one end of the first circuit board, an output capacitor is arranged at the lead-out end of the last inductor, the input capacitor is arranged at the other end of the second circuit board, the first circuit board and the second circuit board are connected to form a combined board through the conductive column, the input capacitor and the output capacitor are respectively located at opposite ends of the combined board, and the cross-connection conductive plate is arranged in the space between the two circuit boards.

[0019] Compared with the prior art, the present application has the beneficial technical effects that:

[0020] 1. The present application arranges conductive units on two circuit boards respectively, the conductive units are symmetrically arranged on two opposite surfaces of each circuit board, the conductive units are sequentially connected through the conductive column, the inductor is formed, the conductive column has the functions of conducting electricity and fixing, and the volume of the filter is effectively reduced;

[0021] 2. Further, the present application connects the capacitors in parallel through the cross-connection conductive plate at the two ends of the inductor, the stopband attenuation characteristic of the filter is improved, and the performance of the filter is optimized;

[0022] 3. Further, the present application can adapt to different power levels by changing the size of the conductive unit, and the power range of the filter is expanded. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a first conductive unit layout diagram of one specific embodiment of the present application;

[0024] Figure 2 is a second conductive unit layout diagram of one specific embodiment of the present application;

[0025] Figure 3 is a combined first conductive unit and second conductive unit layout diagram of one specific embodiment of the present application;

[0026] Figure 4 is a first circuit board A layout diagram of one specific embodiment of the present application;

[0027] Figure 5is a single-sided layout diagram of a second circuit board of one embodiment of the present application;

[0028] Figure 6 is a combined layout diagram of a first circuit board and a second circuit board of one embodiment of the present application;

[0029] Figure 7 is a schematic diagram of a low-pass filter circuit of one embodiment of the present application;

[0030] Figure 8 is an exploded schematic diagram of a low-pass filter circuit of one embodiment of the present application. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below with reference to the accompanying drawings. Embodiment One

[0033] The inductance structure of the present application comprises two circuit boards, the first circuit board A is provided with at least one first conductive unit, and the second circuit board B is provided with at least one second conductive unit.

[0034] The two surfaces of the first circuit board A are symmetrically provided with at least one first conductive unit, i.e. if the two surfaces are unfolded along one edge of the circuit board A, the first conductive units on the two surfaces are arranged to be mirror images of each other.

[0035] Similarly, the two surfaces of the second circuit board B are symmetrically provided with at least one second conductive unit, i.e. if the two surfaces are unfolded along one edge of the circuit board B, the second conductive units on the two surfaces are arranged to be mirror images of each other.

[0036] For the convenience of description, only one surface of the circuit board is described in the present application, and the rest is by analogy.

[0037] The surface structure of the first circuit board A is as shown in Figure 1 From one end of the circuit board, there are sequentially distributed an input end 1, a plurality of first conductive units 2, and a plurality of through holes 4.

[0038] Each through hole 4 is located at the side of the plurality of first conductive units 2, and the through hole 4 penetrates the front and back surfaces of the first circuit board A, for increasing the creepage voltage resistance.

[0039] At least two conductive holes are formed on the input end and each first conductive unit 2, and a conductive hole 11 and a conductive hole 12 are formed on the input end 1 and are located at different positions of the input end 1, respectively. The first conductive hole 11 is used when connecting the second conductive unit on the second circuit board, and the second conductive hole 12 is used to fix the first end of the cross-over conductive plate.

[0040] The first conductive unit 2 is set as a rectangle, and each first conductive unit is arranged in parallel, thereby saving the circuit board area and increasing the number of first conductive units.

[0041] The first first conductive unit 21 is also provided with at least two conductive holes, i.e., a first conductive hole 211 and a second conductive hole 212, which are respectively located at two ends of the first first conductive unit 21. The first conductive hole 211 is two in the figure, and the number of the conductive holes at the same position can be set according to specific conditions in practice. Here, for the convenience of description, it is simplified to one, and the rest is similar.

[0042] Correspondingly, the second first conductive unit 22 is also provided with a first conductive hole 221 and a second conductive hole 222, which are respectively located at two ends of the second first conductive unit 22.

[0043] The remaining first conductive units 23, 24, 25 and 27 are sequentially arranged and have the same structure, which will not be described in detail.

[0044] The cross unit 26 is used for cross connection between the first first conductive unit 21 and the fifth first conductive unit 25, and is arranged between the fifth first conductive unit and the last first conductive unit 27. The cross unit 26 is provided with a first conductive hole 261 for connecting the cross conductive plate with the second conductive hole 12 of the input end.

[0045] The first conductive units 2 are sequentially arranged along the long side of the first circuit board A and form a first angle with the long side, which is greater than 90 degrees, so as to ensure that the second conductive units on the second circuit board B are arranged in a staggered manner, and the first conductive units and the second conductive units are connected in a head-to-tail manner.

[0046] The arrangement of the second conductive units 3 on the second circuit board B is shown in Figure 2 The second conductive units 3 are arranged in parallel and distributed along the long side of the second circuit board B. The second conductive units 3 form a second angle with the long side, and the second angle is less than 90 degrees.

[0047] The second conductive units 3 are also rectangular, and at least two conductive holes are arranged on each second conductive unit 3 for sequentially connecting the first conductive units 2 through conductive columns.

[0048] The first conductive unit 31 is provided with a first conductive hole 311 and a second conductive hole 312 at two ends, respectively. The second conductive unit 32 is provided with a first conductive hole 321 and a second conductive hole 322 at two ends, respectively, and the rest is similar.

[0049] In order to connect the first capacitor in parallel with the inductor, realize low-pass filter, improve the stopband attenuation characteristic of the filter, the structure of the last second conductive unit 36 is different from the structure of the rest of the second conductive units. On the basis of including the rest of the second conductive units, an extension section 363 is arranged, which extends along the distribution direction of the second conductive unit. The extension section 363 is arranged on one side of the second conductive unit and forms an L-shaped structure with the second conductive unit, so as to ensure that the first conductive hole 361 on the conductive unit and the conductive hole corresponding to the first conductive unit on the first circuit board A are in the same position, so as to be connected together by the conductive column.

[0050] In the idle position of the L-shaped structure, a grounding unit 5 is arranged for connecting the second capacitor between the second conductive unit and the grounding unit.

[0051] The conductive holes on the first circuit board A and the second circuit board B are connected by the conductive column to form a combined board, and the first conductive units and the second conductive units are arranged in a spaced manner, as shown in Figure 3 The projection of the first edge of the first first conductive unit 21 on the second circuit board overlaps the first edge of the first second conductive unit 31, and the conductive column passes through the first conductive hole 211 on the first conductive unit 21 and the second conductive hole 311 on the second conductive unit 31 to connect one side of the first conductive unit 21 and the second conductive unit 31.

[0052] The projection of the third edge of the second first conductive unit 21 on the second circuit board overlaps the third edge of the second second conductive unit 32, and the conductive column passes through the second conductive hole 212 on the first conductive unit 21 and the second conductive hole 322 on the second conductive unit 32 to connect the third edge of the first conductive unit 21 and the third edge of the second conductive unit 32.

[0053] Among them, the first edge and the third edge of the rectangular conductive unit are parallel, and the second edge and the fourth edge are parallel. The conductive holes are arranged on the first edge and the third edge.

[0054] By analogy, all the first conductive units and the second conductive units are connected in series to form a spiral inductor.

[0055] According to the size of the inductor transmission power, the area and the number of the conductive units are changed. Specific embodiment two

[0057] A low-pass filter circuit unit of the application combines Figure 1 , 2As shown in Fig. 3, on the first circuit board A, the input terminal 1 is connected with the bridging unit 26 through the bridging conductive plate 6, the second conductive hole 12 on the input terminal 1 is fixedly connected with the conductive hole on one end of the bridging conductive plate 6 through a conductive screw, the first conductive hole 261 on the bridging unit 26 is fixedly connected with the conductive hole on the other end of the bridging conductive plate 6 through a conductive screw, and the bridging conductive plate 6 is located in the space between the first circuit board A and the second circuit board B, thereby greatly saving the volume of the filter unit.

[0058] One end of the first capacitor 51 is welded on the bridging unit 26, and the other end is welded on the last first conductive unit 27. The number of the first capacitors is adjusted according to the power of the filter unit. Two first capacitors are shown in the present application, including the first first capacitor 51 and the second first capacitor 52.

[0059] On the second circuit board B, between the last second conductive unit 36 and the grounding unit 5, a second capacitor is welded, which includes the first second capacitor 53 and the second second capacitor 54. Of course, the number of the second capacitors is adjusted according to the power of the filter unit.

[0060] The grounding unit 5 is arranged next to the third plate edge of the second circuit board, so as to facilitate the direct leading-out of the grounding terminal.

[0061] The low-pass filter circuit structure of the present application includes the first circuit board A and the second circuit board B, the layout on the front surface A-A and the back surface A-B of the first circuit board A is as shown in Fig. 3, and the two are mirror images of each other. Hereinafter, one surface is described. Figure 4

[0062] On the surface of the first circuit board A, three groups of conductive units are arranged, each group of conductive units includes at least one conductive unit, and the surface sizes of the conductive units in each group are the same or different.

[0063] In the present embodiment, the first conductive unit group 1-1, the second conductive unit group 1-2, and the third conductive unit group 1-3 are arranged in sequence, each first conductive unit in each group of conductive units is arranged in parallel, each conductive unit is a rectangle, a conductive hole is arranged on the first edge and the third edge of each conductive unit respectively, each conductive unit forms a first included angle with the long edge of the circuit board, the first included angle is greater than 90 degrees, the first edge of each conductive unit is parallel to the third edge, and the structure of each group of conductive units is as described in Embodiment One.

[0064] Similarly, on the two surfaces of the second circuit board B, three groups of conductive units are also arranged, and the conductive units on the two surfaces are mirror images. As shown in Fig. 4. Figure 5

[0065] ​​The fourth conductive unit group 2-1, the fifth conductive unit group 2-2, and the sixth conductive unit group 2-3 are arranged sequentially. The first conductive units in each group are arranged in parallel. Each conductive unit is rectangular and has conductive holes on its first and third sides. Each conductive unit forms a first angle with the long side of the circuit board, which is less than 90 degrees. The first and third sides of each conductive unit are parallel. The structure of each group of conductive units is as described in Specific Embodiment 1.

[0066] Each conductive unit in the first conductive group 1-1 and each conductive unit in the fourth conductive group 2-1 are connected in sequence by conductive posts to form a first inductor. A first capacitor is connected in parallel across the two ends of the first inductor, and a first grounding capacitor is connected in parallel across the output end of the first inductor to form a first low-pass filter circuit unit.

[0067] Similarly, each conductive unit in the second conductive group 1-2 and each conductive unit in the fifth conductive group 2-2 are connected in sequence by conductive pillars to form a second inductor. A second capacitor is connected in parallel across the two ends of the second inductor, and a second grounding capacitor is connected in parallel at the output end of the second inductor to form a second low-pass filter circuit unit.

[0068] Each conductive unit in the third conductive group 1-3 is connected to each conductive unit in the sixth conductive group 2-3 in sequence using conductive pillars to form the third inductor.

[0069] The first inductor, the second inductor, and the third inductor are connected in series in sequence, and their combined structure is as follows: Figure 6 As shown, its schematic diagram is as follows: Figure 7 As shown.

[0070] Input capacitor C1 is connected to input terminal 1 of the first circuit board, output capacitor C6 is connected to output terminal of the second circuit board, bridging capacitor C2 is connected in parallel in the first inductor L1, bridging capacitor C4 is connected in parallel across the two ends of the second inductor L2, grounding capacitor C3 is connected at the series connection point of the first inductor L1 and the second inductor L2, and grounding capacitor C5 is connected at the series connection point of the third inductor L3 and the second inductor L2.

[0071] An exploded view of a low-pass filter circuit structure according to this application is shown below. Figure 8 As shown in the figure. 1 represents the input terminal, 21 is the first conductive unit, 7 is the bridging conductive plate of the first inductor, 8 is the conductive post, 31 is the second conductive unit, 51 is the parallel capacitor across the inductor, 53 is the grounding capacitor, 10 is the bridging conductive plate of the second inductor, A is the first circuit board, B is the second circuit board, and 1 is the output terminal.

[0072] By using a bridging conductive plate to connect parallel capacitors and placing the bridging conductive plate between two circuit boards, the stopband attenuation characteristics of the filter are improved and the size of the filter is reduced.

[0073] The conductive column is used to connect the conductive units on two circuit boards in sequence through the conductive holes on the conductive units to form an inductor, and the conductive column plays a role of fixing and conducting at the same time, thereby effectively reducing the size of the filter.

[0074] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. An inductor structure, characterized in that: The device includes two circuit boards, each with a set of conductive units, including at least one conductive unit. The conductive unit sets are symmetrically arranged on both sides of each circuit board. Each conductive unit has at least two conductive holes. The first conductive units on the first circuit board and the second conductive units on the second circuit board are staggered. A plurality of conductive posts connect the first and second conductive units on both circuit boards sequentially through the conductive holes to form an inductor. The last second conductive unit on the second circuit board includes an extension section for connecting the last second conductive unit to the last first conductive unit on the first circuit board through the conductive posts. The extension section extends along the distribution direction of the second conductive units. The last second conductive unit has an L-shaped structure. On one side of the L-shaped structure, a grounding unit is provided for connecting a second capacitor between the second conductive unit and the grounding unit.

2. The inductor structure according to claim 1, characterized in that: Each first conductive unit is arranged in parallel, and each second conductive unit is arranged in parallel. A through-hole is provided between each conductive unit on the same circuit board, and the through-hole passes through both sides of the circuit board.

3. The inductor structure according to claim 1, characterized in that: The first and second conductive units are both rectangular structures. When the first and second circuit boards overlap, the projection of the first side of the i-th first conductive unit on the second circuit board overlaps with the first side of the j-th second conductive unit. The k-th conductive post is connected to the first conductive hole of the j-th second conductive unit through the first conductive hole of the i-th first conductive unit. The projection of the third side of the i-th first conductive unit on the second circuit board is offset from the third side of the j-th second conductive unit. The projection of the third side of the (i+1)-th first conductive unit on the second circuit board overlaps with the third side of the j-th second conductive unit. The (k+1)-th conductive post is connected to the second conductive hole of the j-th second conductive unit through the second conductive hole of the (i+1)-th first conductive unit. The first and second conductive units are connected sequentially to form an inductor. The first side of each conductive unit is opposite to its third side, where i, j, and k are positive integers greater than or equal to 1.

4. The inductor structure according to claim 1, characterized in that: A bridging unit is provided on the first circuit board. The bridging unit is located between the last first conductive unit and the previous first conductive unit and is used to connect the bridging conductive plate and the first capacitor.

5. A low-pass filter circuit unit structure, characterized in that: The device includes two circuit boards, an inductor as described in any one of claims 1-4, a first capacitor on the first circuit board, a conductive plate connecting the first first conductive unit and the first end of the first capacitor as the first lead of the low-pass filter circuit, and the second end of the first capacitor and the last second conductive unit connected by a conductive post as the second lead of the low-pass filter circuit, thus forming a low-pass filter circuit unit.

6. The low-pass filter circuit unit structure according to claim 5, characterized in that: It also includes a second capacitor, which is disposed on the second circuit board. The first end of the second capacitor is connected to the second end of the low-pass filter circuit unit, and its second end is connected to the ground lead on the second circuit board; a bridging conductive plate is located between the two circuit boards.

7. A low-pass filter circuit structure, characterized in that: Includes at least one inductor as described in any one of claims 1-4, and a third capacitor is provided between the connection point of two adjacent inductors and ground; a bridging unit and a bridging conductive plate are provided between the two leads of at least one inductor, the first end of the bridging conductive plate is connected to the first end of the inductor, the second end is connected to the bridging unit and the first end of the first capacitor, and the second end of the first capacitor is connected to the second end of the inductor.

8. The low-pass filter circuit structure according to claim 7, characterized in that: An input capacitor is set at the input terminal of the first inductor, and the input capacitor is located at one end of the first circuit board. An output capacitor is set at the lead-out terminal of the last inductor, and the input capacitor is located at the other end of the second circuit board. The first circuit board and the second circuit board are connected by conductive pillars to form a combined board. The input capacitor and the output capacitor are located at opposite ends of the combined board. A bridging conductive plate is set in the space between the two circuit boards.

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