Integrated inductor

Abstract

The utility model relates to the field of inductors, and provides an integrated inductor which comprises a frame body, a fixed shell, a first coil, a second coil, a first magnetic core, a second magnetic core and a third magnetic core, the frame body comprises a hollow groove body, and a first bottom plate, a second bottom plate and a third bottom plate are arranged at the bottom of the groove body. The first bottom plate and the second bottom plate are located on the left side and the right side of the bottom of the groove body, the third bottom plate is located in the center of the bottom of the groove body, a mounting groove corresponding to the third bottom plate is formed in the center of the top of the groove body, and the first coil and the second coil are located on the left side and the right side of the third bottom plate respectively. A mounting groove is formed in the groove body, the first magnetic core and the second magnetic core are wound on the outer surface of the groove body, the first magnetic core and the second magnetic core enter the groove body from the two ends of the groove body respectively, the third magnetic core is arranged in the mounting groove, and the first magnetic core, the second magnetic core and the third magnetic core are fixed through the fixing shell; the differential mode and the common mode are integrated, the circuit size is reduced, and the cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of inductors, and more specifically, to an integrated inductor. Background Technology

[0002] Common-mode inductors and differential-mode inductors are common electronic components and are widely used in power supply EMC and EMI filtering. Existing common-mode inductors and differential-mode inductors are usually made and installed as two independent devices. When using common-mode inductors and differential-mode inductors for EMC and EMI filtering in circuits, they occupy a large volume.

[0003] In a common-mode inductor, if the magnetic flux generated by one coil does not pass through the other to form a closed loop, leakage flux will be generated. If the leakage flux of the two coils can be used as the differential-mode inductance, the differential and common-mode inductance can be integrated into one, which can reduce the size and save costs. Utility Model Content

[0004] The problem solved by this invention is how to provide an integrated inductor that combines differential and common mode inductance.

[0005] To address the aforementioned problems, this utility model provides an integrated inductor, comprising: a frame, a fixed housing, a first coil, a second coil, a first magnetic core, a second magnetic core, and a third magnetic core. The frame includes a hollow slot, which is provided with a first base plate, a second base plate, and a third base plate. The first and second base plates are located on the left and right sides of the bottom of the slot, and the third base plate is located at the center of the bottom of the slot. A mounting groove is located at the center of the top of the slot, corresponding to the position of the third base plate. The first coil and the second coil are located on the left and right sides of the third base plate, respectively, and are wound around the outer surface of the slot. The first magnetic core and the second magnetic core enter the slot from both ends of the slot, respectively. The third magnetic core is disposed in the mounting groove. The fixed housing covers the frame and fixes the first magnetic core, the second magnetic core, and the third magnetic core.

[0006] Furthermore, the first and second magnetic cores are E-shaped magnetic cores with the same structure.

[0007] Furthermore, the E-shaped magnetic core includes a bottom post, a middle post disposed in the center of the bottom post, and two side posts located at both ends of the bottom post. When the first magnetic core and the second magnetic core enter the slot to form a common-mode magnetic field, the middle posts of the first magnetic core and the second magnetic core enter the slot, and the two pairs of side posts of the first magnetic core and the second magnetic core respectively contact each other on both sides of the third base plate.

[0008] Furthermore, the length of the central column of the E-shaped magnetic core is less than the length of the side columns, so that when the central columns of the first and second magnetic cores enter the groove, a central column air gap is formed to control the leakage flux.

[0009] Furthermore, the third magnetic core is elongated to enhance leakage flux.

[0010] Furthermore, the fixed outer shell includes a shell, a first fitting part, a second fitting part, and a fixing part. The first fitting part is a rectangular annular patch arranged along the inner ring of the top edge of the shell. The second fitting part is a strip-shaped patch. Support plates are provided at both ends of the second fitting part. The bottoms of the two support plates are respectively fixed to the middle of the top edges of the front and rear sides of the shell. The fixing part includes fixing pieces located on both sides of the bottom of the shell. The fixing pieces are provided with first fixing holes. Second fixing holes are provided at both ends of the first bottom plate and the second bottom plate at positions corresponding to the first fixing holes.

[0011] Furthermore, wiring probes are also provided at the bottom of the first base plate and the second base plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention utilizes the leakage flux generated by the coils on both sides of the common-mode inductor, uses the leakage flux as the differential-mode inductance, and enhances the leakage flux through a third magnetic core, thereby integrating the differential-mode inductor and the common-mode inductor into one unit, effectively reducing the size when used in a circuit. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall principle structure of an embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the frame structure according to an embodiment of the present utility model;

[0016] Figure 3 This is a schematic diagram of the principle structure of the EE-shaped magnetic core according to an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the fixed outer shell principle structure of an embodiment of the present utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1-Frame; 2-First coil; 3-Second coil; 4-First magnetic core; 5-Second magnetic core; 6-Third magnetic core; 7-Connection probe; 11-Slot; 12-First base plate; 13-Second base plate; 14-Third base plate; 15-Mounting slot; 16-Second fixing hole; 81-Housing; 82-First fitting part; 83-Second fitting part; 84-Support plate; 85-Fixing part; 86-First fixing hole. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] In the description of this specification, references to terms such as "embodiment," "one embodiment," and "one implementation" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or illustrative embodiment of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0023] like Figure 1 As shown, this utility model provides an integrated inductor, comprising: a frame 1, a fixed outer shell, a first coil 2, a second coil 3, a first magnetic core 4, a second magnetic core 5, and a third magnetic core 6, wherein the frame 1 is as follows: Figure 2 As shown, the device includes a hollow groove 11, which is provided with a first base plate 12, a second base plate 13, and a third base plate 14. The first base plate 12 and the second base plate 13 are located on the left and right sides of the bottom of the groove 11, and the third base plate 14 is located in the center of the bottom of the groove 11. A mounting groove 15 is provided in the center of the top of the groove 11, corresponding to the third base plate 14. The first coil 2 and the second coil 3 are located on the left and right sides of the third base plate 14, respectively, and are wound around the outer surface of the groove 11. The first magnetic core 4 and the second magnetic core 5 enter the groove 11 from both ends of the groove 11, respectively. The third magnetic core 6 is disposed in the mounting groove 15. The fixing shell covers the frame 1 and fixes the first magnetic core 4, the second magnetic core 5, and the third magnetic core 6.

[0024] A coil is provided on the surface of the slot 11. The first magnetic core 4 and the second magnetic core 5 are inside the slot 11 and form the main magnetic circuit, i.e., the common mode inductor. The leakage flux of the common mode inductor is generated by the magnetic flux generated by the magnetic core and coil on one side without passing through the other side to form a closed loop. The leakage flux generated by the coils on both sides of the common mode inductor is used as the differential mode inductance. The leakage flux is enhanced by the third magnetic core 6, so that the differential mode inductor and the common mode inductor are integrated into one.

[0025] In one embodiment of this utility model, the first magnetic core 4 and the second magnetic core 5 are E-shaped magnetic cores with identical structures. The length of the central post of the E-shaped magnetic core is less than the length of the side posts. The two magnetic cores enter the slot 11 to form a shape as shown in the figure. Figure 3 The EE core shown has a short center column, forming a center column air gap. When a common-mode signal passes through the inductor, the magnetic flux generated by the two E-shaped cores cancels out at the center column due to the open air gap, and the magnetic flux does not pass through the center column. When a differential-mode signal passes through the integrated differential and common-mode inductor, the magnetic flux generated by the two E-shaped cores passes through the center column in the same direction. The size of the center column air gap is negatively correlated with the magnetic flux passing through the center column. During design, cores with different center column lengths can be used according to requirements, and the differential-mode inductance can be adjusted by adjusting the leakage flux.

[0026] In one embodiment of this utility model, such as Figure 4 As shown, the fixed outer shell includes a shell 81, a first fitting part 82, a second fitting part 83, and a fixing part 85. The first fitting part 82 is a rectangular annular patch arranged along the inner ring of the top edge of the shell 81. The second fitting part 83 is a strip-shaped patch, and support plates 84 are provided at both ends of the second fitting part 83. The bottoms of the two support plates 84 are respectively fixed to the middle of the top edge of the front and rear sides of the shell 81. The fixing part 85 includes four fixing pieces located at the four corners of the bottom of the shell 81. The fixing pieces are provided with first fixing holes 86. The plate 12 and the second base plate 13 are provided with second fixing holes 16 at the positions corresponding to the first fixing holes 86. After each magnetic core is placed on the frame 1, the fixing shell covers it, the first fixing holes 86 and the second fixing holes 16 are aligned, and the fixing shell is fixed to the frame 1 by screws and nuts. At this time, the first fitting part 82 fits the upper surface edge of the first magnetic core 4 and the second magnetic core 5, the inner side of the shell 81 fits the side of the side post of the first magnetic core 4 and the second magnetic core 5, and the second fitting part 83 covers the top surface of the mounting groove 15 and fits the third magnetic core 6 to achieve the fixing of the magnetic core.

[0027] Although the disclosure is as stated above, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this utility model.

Claims

1. An integrated inductor, characterized by include: The frame (1), fixed outer shell, first coil (2), second coil (3), first magnetic core (4), second magnetic core (5), and third magnetic core (6) are provided. The frame (1) includes a hollow groove (11). The groove (11) is provided with a first bottom plate (12), a second bottom plate (13), and a third bottom plate (14). The first bottom plate (12) and the second bottom plate (13) are located on the left and right sides of the bottom of the groove (11), and the third bottom plate (14) is located at the center of the bottom of the groove (11). The top center of the groove (11) is connected to the... The third base plate (14) has a mounting groove (15) at the corresponding position. The first coil (2) and the second coil (3) are located on the left and right sides of the third base plate (14) respectively and are wound around the outer surface of the groove (11). The first magnetic core (4) and the second magnetic core (5) enter the groove (11) from both ends of the groove (11) respectively. The third magnetic core (6) is set in the mounting groove (15). The fixed shell covers the frame (1) and fixes the first magnetic core (4), the second magnetic core (5) and the third magnetic core (6).

2. The integrated inductor of claim 1, wherein, The first magnetic core (4) and the second magnetic core (5) are E-shaped magnetic cores with the same structure.

3. The integrated inductor of claim 2, wherein, The E-shaped magnetic core includes a bottom post, a middle post located in the center of the bottom post, and two side posts located at both ends of the bottom post. When the first magnetic core (4) and the second magnetic core (5) enter the slot (11) to form a common mode magnetic field, the middle posts of the first magnetic core (4) and the second magnetic core (5) enter the slot (11), and the two pairs of side posts of the first magnetic core (4) and the second magnetic core (5) respectively contact each other on both sides of the third base plate (14).

4. The integrated inductor of claim 3, wherein, The length of the central column of the E-shaped magnetic core is less than the length of the side column, so that when the central columns of the first magnetic core (4) and the second magnetic core (5) enter the groove (11), a central column air gap is formed to control the leakage flux.

5. The integrated inductor of claim 4, wherein, The third magnetic core (6) is elongated and is used to enhance leakage flux.

6. The integrated inductor of claim 5, wherein, The fixed outer shell includes a shell (81), a first fitting part (82), a second fitting part (83), and a fixing part (85). The first fitting part (82) is a rectangular ring-shaped patch arranged along the inner ring of the top edge of the shell (81). The second fitting part (83) is a strip-shaped patch. Support plates (84) are provided at both ends of the second fitting part (83). The bottoms of the two support plates (84) are respectively fixed to the middle of the top edge of the front and rear sides of the shell (81). The fixing part (85) includes fixing pieces located on both sides of the bottom of the shell (81). The fixing pieces are provided with first fixing holes (86). The first bottom plate (12) and the second bottom plate (13) are provided with second fixing holes (16) at positions corresponding to the first fixing holes (86).

7. The integrated inductor of claim 6, wherein, Wiring probes (7) are also provided at the bottom of the first base plate (12) and the second base plate (13).

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