Series common mode inductor and circuit system

Abstract

The utility model discloses a series common mode inductor and a circuit system, the inductor comprises a base plate, a magnetic core, a winding and a magnetic column, the base plate is provided with a first surface and a second surface which are opposite to each other, and the base plate is provided with a plate hole penetrating through the first surface and the second surface; the magnetic core is located on the first surface of the bottom plate, and a winding is wound on the magnetic core; the winding comprises a plurality of series coil groups, each series coil group is formed by connecting input ends and output ends of a plurality of coils in series, so that each series coil group is provided with an input end and an output end, and each input end and each output end respectively penetrate out of the second surface to the first surface through the plate holes; the number of the plate holes is twice that of the series coil groups; the magnetic columns are located on the magnetic core and located between every two adjacent series coil sets. According to the utility model, the inductor volume can be saved, and the special electrical performance is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of inductors, in particular to a series common-mode inductor and a circuit system. Background Art

[0002] At this stage, with the development of new technologies and new products, the design requirements and structural layout requirements of charging equipment are becoming increasingly higher. Some electronic products are large in size and difficult to install, which will affect the layout of PCB boards, and special electrical parameters cannot meet the design requirements. Utility Model Content

[0003] The utility model aims to solve the problems of large volume and unstable electrical performance of existing inductors, and to provide a series common-mode inductor and a circuit system.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A series common mode inductor comprises a base plate, a magnetic core, a winding and a magnetic column, wherein: the base plate has a first surface and a second surface opposite to each other, and a plate hole penetrating the first surface and the second surface is arranged on the base plate; the magnetic core is located on the first surface of the base plate, and the winding is wound on the magnetic core; the winding comprises a plurality of series coil groups, each of which is formed by connecting the input and output ends of a plurality of coils in series, so that each of the series coil groups has an input end and an output end, and each of the input end and each of the output end respectively passes through the plate hole from the second surface to the first surface, and the number of the plate holes is twice the number of the series coil groups; the magnetic column is located on the magnetic core and between two adjacent series coil groups.

[0006] In some embodiments of the present invention, the winding includes three series-connected coil groups, and the number of the plate holes is six.

[0007] In some embodiments of the present invention, the number of the magnetic columns is two.

[0008] In some embodiments of the present invention, the magnetic core is circular, elliptical or rectangular.

[0009] In some embodiments of the present invention, the series coil group includes two coils.

[0010] In some embodiments of the utility model, in the direction from the outside to the inside of the bottom plate, the area of ​​the outer space of the magnetic core corresponding to the bottom plate is the first area, the area of ​​the magnetic core corresponding to the bottom plate is the second area, and the area of ​​the inner space of the magnetic core corresponding to the bottom plate is the third area; the plate holes include a first column of plate holes and a second column of plate holes, the first column of plate holes is located in the first area, and the second column of plate holes is located in the third area.

[0011] In some embodiments of the present invention, the magnetic core is rectangular, and includes two winding arms for winding the coil and a connecting arm connecting the winding arms; the length of the magnetic column is the same as the length of the connecting arm.

[0012] In some embodiments of the present utility model, the magnetic core and the magnetic column are fixed by glue dispensing; the input end, the input end and the bottom plate are fixed by glue dispensing.

[0013] In some embodiments of the present invention, the base plate is made of epoxy board or plastic, the magnetic core is an amorphous magnetic core, and the coil is a flat copper wire or aluminum wire.

[0014] The utility model also provides a circuit system, including a PCB board, a power module and the series common-mode inductor as described above, wherein: the power module is located on the surface of the PCB board and is used to output a power signal; the series common-mode inductor is fixed on the surface of the PCB board and electrically connected to the power module, and the series common-mode inductor is used to filter the power signal to output a power signal of a target frequency.

[0015] The utility model has the following beneficial effects:

[0016] The series common-mode inductor proposed by the utility model is provided with a plate hole on the bottom plate, and the coil is wound on the magnetic core in the form of a series coil group. The series coil group is formed by connecting the input and output ends of multiple coils in series, so that each series coil group has an input end and an output end, which can reduce the number of lead pins, thereby effectively saving volume space and facilitating the layout of the PCB board and changing the circuit layout of the board; and compared with the design of connecting the coils in series on the PCB board in the prior art, the utility model directly connects the coils in series, so that the contact between the coils is better, and the inductance can be increased. When a large current and voltage are passed, its special electrical performance is stable; at the same time, by adding a magnetic column between two adjacent series coil groups, the leakage inductance can be increased, thereby further improving the stability of the inductance performance.

[0017] In addition, in some embodiments, the following beneficial effects are also achieved:

[0018] The holes on the bottom plate can limit the coil, so that the coil can be effectively positioned to prevent displacement during installation. The series coil is reasonably arranged, the difference between the inductance of each phase is small, and the inductance balance is high; the process is simplified, the reliability is high, the creepage distance between the windings is increased, and the heat dissipation area of ​​the product is improved.

[0019] Other beneficial effects of the embodiments of the present invention will be further described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the inductor in Example 1;

[0021] Figure 2 is an exploded diagram of the inductor in Example 1;

[0022] Figure 3A is a front view of the inductor in Example 1;

[0023] Figure 3B is a left side view of the inductor in Example 1;

[0024] Figure 3C is a right side view of the inductor in Example 1;

[0025] Figure 3D is a top view of the inductor in Example 1

[0026] Figure 4 is a schematic diagram of the structure of the winding in Example 1;

[0027] Figure 5 is a top view of the bottom plate in Example 1;

[0028] The reference numerals are as follows:

[0029] Base plate 100, magnetic core 200, winding 300, magnetic column 400;

[0030] Plate holes 110 , a first row of plate holes 111 , a second row of plate holes 112 , a first region 121 , a second region 122 , and a third region 123 . DETAILED DESCRIPTION

[0031] The present invention is further described below with reference to the accompanying drawings and in combination with preferred embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0032] It should be noted that the directional terms such as left, right, up, down, top, and bottom in this embodiment are merely relative concepts or are based on the normal use status of the product, and should not be considered as restrictive.

[0033] The following embodiment of the utility model proposes a series common mode inductor, including a base plate 100, a magnetic core 200, a winding 300 and a magnetic column 400, wherein: the base plate 100 has a first surface and a second surface opposite to each other, and a plate hole 110 is provided on the base plate 100, which passes through the first surface and the second surface, and is used to fix and support the series common mode inductor body (i.e., the magnetic core 200, the winding 300 and the magnetic column 400); the magnetic core 200 is located on the first surface of the base plate 100, and the winding 300 is wound on the magnetic core 200; the winding 300 includes a plurality of series coil groups, each of which is formed by connecting the input and output ends of a plurality of coils in series, so that each series coil group has an input end and an output end, and each input end and each output end respectively pass through the plate hole from the second surface to the first surface, and the number of the plate holes is twice the number of the series coil groups; the magnetic column 400 is located on the magnetic core 200 and is located between two adjacent series coil groups.

[0034] Example:

[0035] In this embodiment, if Figures 1 to 3D As shown, the winding 300 includes three series-connected coil groups, thereby forming a three-phase series common-mode inductor. The description of this embodiment is as follows:

[0036] Base plate 100

[0037] In this embodiment, the material of the bottom plate 100 is epoxy board or plastic, preferably, FR530 material can be used. The board holes set on the bottom plate 100 are assembled with the PIN pins and fixed by glue, that is, the input end of the series coil group, the input end and the bottom plate 100 are fixed on the second surface by glue; when the inductor is assembled on the substrate, the bottom plate 100 plays the role of supporting the inductor body, and at the same time, the bottom plate can limit the coil to achieve effective positioning and prevent deviation; Figure 5 As shown, the number of the plate holes on the bottom plate 100 is six.

[0038] According to the direction from the outside to the inside of the bottom plate 100, the area of ​​the outer space of the magnetic core 200 corresponding to the bottom plate 100 is the first area 121, the area of ​​the magnetic core 200 corresponding to the bottom plate 100 is the second area 122, and the area of ​​the inner space of the magnetic core 200 corresponding to the bottom plate 100 is the third area 123; the plate holes include a first column of plate holes 111 and a second column of plate holes 112, each column of plate holes has 3 plate holes, the first column of plate holes 111 is located in the first area 121, and is used to allow the input end of the series coil group to pass through the bottom plate through the first column of plate holes 111, and the second column of plate holes 112 is located in the third area 123, and is used to allow the output end of the series coil group to pass through the bottom plate through the second column of plate holes 112.

[0039] Magnetic core 200

[0040] The magnetic core 200 is circular, elliptical or rectangular; the magnetic core 200 is an amorphous magnetic core, and the magnetic core 200 is designed to form a structure with the entire coil.

[0041] Winding 300

[0042] like Figure 4 As shown, each series coil group includes two coils, and each two corresponding coils are connected end to end to form a group of series coils, totaling three groups, and the connection method is welding the head and tail ends, that is, the above-mentioned input end and output end are connected in series, so that each series coil group has an input end and an output end; the coil can be wound with copper wire or aluminum wire, and a flat wire vertical winding method is adopted to form a magnetic ring inductor with a magnetic core 200, and the magnetic core 200 is smaller than the inner diameter of the coil. After welding the two coils in series and then assembling the bottom plate, the inductor structure of this embodiment simplifies the manufacturing process, increases the heat dissipation space, and saves the volume space of the substrate layout.

[0043] Magnetic column 400

[0044] The magnetic column 400 is used to adjust electrical parameters and increase leakage inductance, and the combination of the magnetic column 400, the magnetic core 200, and the winding 300 can improve the stability of the inductance performance. In this embodiment, there are two of them, and the magnetic core 200 and the magnetic column 400 are fixed by dispensing glue. When the magnetic core 200 is rectangular, it includes two winding arms for winding the coil and a connecting arm connecting the winding arms; the length of the magnetic column 400 is the same as the length of the connecting arm. Schematically, each magnetic column 400 of the three-phase series common mode inductor includes 4 I 60*15mm magnetic columns, and the material is GH12 (the material of the GH12 magnetic core is usually silicon steel sheet).

[0045] This embodiment has the following advantages:

[0046] 1) Connect the coils in series during welding (welding the ends in series can increase the inductance). In the prior art, the coils are mostly connected in series on the PCB. In this case, the series connection of the coils on the PCB is not in good contact, and a guide bar needs to be added for series connection. In this embodiment, the coils are directly connected in series and then connected to the PCB. The contact of this embodiment is better. When a large current and voltage are passed, the special electrical properties are more stable, so that the product characteristics can be more stable.

[0047] 2) The three-phase series common-mode inductor design proposed in this embodiment reduces the number of lead pins and effectively saves volume space, making it easier for customers to change the circuit layout of the PCB board;

[0048] 3) The bottom plate 100, the magnetic core 200 and the wound coil are effectively assembled, easy to assemble, very good consistency and high production efficiency;

[0049] 4) The winding coil is automatically wound, with good consistency and uniform distribution, which can increase the creepage distance between windings;

[0050] 5) Each phase has a series inductor, and the coils are evenly distributed across the corresponding series, the difference between the inductances of each phase is small, and the inductance balance is high;

[0051] 6) This embodiment only needs to lay out 6 plate holes on the bottom plate, compared with the three-phase inductor in the prior art, which usually has 12 plate holes (the middle 6 holes need to be connected in series), thereby reducing the production cost and volume of PCB products;

[0052] 7) Reasonable layout of series coils, simplified process, improved reliability, increased creepage distance between windings, and increased heat dissipation area of ​​the product.

[0053] This embodiment adopts a three-phase series common-mode inductor design, where every two corresponding coils are connected end to end to form a group of series coils. This design simplifies the process, improves reliability, and saves circuit layout space.

[0054] The utility model also provides a circuit system, including a PCB board, a power module and the series common-mode inductor as above, wherein: the power module is located on the surface of the PCB board and is used to output a power signal; the series common-mode inductor is fixed on the surface of the PCB board and electrically connected to the power module, and the series common-mode inductor is used to filter the power signal to output a power signal of a target frequency.

[0055] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For technicians in the technical field to which the present invention belongs, several equivalent substitutions or obvious variations can be made without departing from the concept of the present invention, and the performance or use is the same, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A series common mode inductor, characterized in that: It includes a base plate, a magnetic core, a winding and a magnetic column, wherein: The bottom plate has a first surface and a second surface opposite to each other, and a plate hole penetrating the first surface and the second surface is arranged on the bottom plate; The magnetic core is located on the first surface of the bottom plate, and the winding is wound around the magnetic core; The winding comprises a plurality of series coil groups, each of which is formed by connecting the input and output ends of a plurality of coils in series, so that each of the series coil groups has an input end and an output end, each of the input end and each of the output ends respectively passes through the plate holes from the second surface to the first surface, and the number of the plate holes is twice the number of the series coil groups; The magnetic column is located on the magnetic core and between two adjacent series coil groups.

2. The series common mode inductor according to claim 1, characterized in that: The winding includes three series-connected coil groups, and the number of the plate holes is six.

3. The series common mode inductor according to claim 2, characterized in that: The number of the magnetic columns is two.

4. The series common mode inductor according to claim 1, characterized in that: The magnetic core is circular, elliptical or rectangular.

5. The series common mode inductor according to claim 4, characterized in that: The series coil group includes two coils.

6. The series common mode inductor according to claim 4, characterized in that: According to the direction from the outside to the inside of the bottom plate, the area of ​​the outer space of the magnetic core corresponding to the bottom plate is the first area, the area of ​​the magnetic core corresponding to the bottom plate is the second area, and the area of ​​the inner space of the magnetic core corresponding to the bottom plate is the third area; The plate holes include a first row of plate holes and a second row of plate holes, the first row of plate holes are located in the first area, and the second row of plate holes are located in the third area.

7. The series common mode inductor according to claim 4, characterized in that: The magnetic core is rectangular and comprises two winding arms for the coil to be wound and a connecting arm connecting the winding arms; the length of the magnetic column is the same as the length of the connecting arm.

8. The series common mode inductor according to claim 1, characterized in that: The magnetic core and the magnetic column are fixed by glue dispensing; the input end, the input end and the bottom plate are fixed by glue dispensing.

9. The series common mode inductor according to claim 1, characterized in that: The base plate is made of epoxy board or plastic, the magnetic core is an amorphous magnetic core, and the coil is a flat copper wire or aluminum wire.

10. A circuit system, characterized in that: The invention comprises a PCB board, a power module and a series common-mode inductor as claimed in any one of claims 1 to 9, wherein: The power module is located on the surface of the PCB board and is used to output a power signal; The series common-mode inductor is fixed on the surface of the PCB board and electrically connected to the power module. The series common-mode inductor is used to filter the power signal to output a power signal of a target frequency.

Images