Common mode integrated inductor

Abstract

The application discloses a common-mode and differential-mode integrated inductor, which comprises a common-mode magnetic core, a differential-mode magnetic core, a first coil and a second coil. The common-mode magnetic core comprises a main magnetic ring. The differential-mode magnetic core is arranged on the outer periphery of the main magnetic ring. The first coil comprises a first inverted U-shaped body which is arranged on one side of the main magnetic ring and has one end downwardly extended into the inner ring hole of the main magnetic ring and the other end downwardly extended along the outer side of the main magnetic ring. The second coil comprises a second inverted U-shaped body which is arranged on the other side of the main magnetic ring and one side of the differential-mode magnetic core and has one end downwardly extended into the inner ring hole of the main magnetic ring and the other end downwardly extended into the inner ring hole of the differential-mode magnetic core. Thus, through the optimization design of the magnetic core structure and the coil, the good balance of the common-mode inductance and the differential-mode inductance performance is realized, the common-mode and differential-mode electromagnetic interference signals in the power supply circuit can be effectively inhibited, the electromagnetic compatibility of the power supply circuit is improved, and the stable operation of the electronic equipment is ensured.

Description

Technical Field

[0001] This invention relates to the field of inductors, and in particular to a common-differential mode integrated inductor. Background Technology

[0002] Electromagnetic interference (EMI) is becoming increasingly prominent in modern electronic devices. Almost all power supply circuits generate common-mode and differential-mode EMI signals. To reduce or suppress these interference signals and ensure that the power supply circuit meets electromagnetic compatibility requirements, it is usually necessary to connect common-mode filter inductors and differential-mode filter inductors in the power supply circuit.

[0003] However, the traditional separate setting of common-mode inductors and differential-mode inductors has many problems. On the one hand, it occupies a large amount of circuit board space, which is not conducive to the miniaturization design of electronic devices. On the other hand, it increases the number of components and costs, and the combination of multiple inductors may lead to complex circuit layout, affecting the stability of signal transmission and device performance.

[0004] To address the aforementioned issues, existing technologies have developed integrated inductors that combine common-mode and differential-mode inductors. However, existing integrated inductors still have some shortcomings, such as complex structure, low stability, and the tendency for various components to loosen or be damaged during use, thus affecting the normal operation of the inductor; some integrated inductors also fail to achieve an optimal balance between common-mode and differential-mode performance, making it impossible to meet increasingly stringent electromagnetic compatibility standards.

[0005] Therefore, a new technical solution needs to be researched to address the above problems. Summary of the Invention

[0006] In view of this, the present invention addresses the shortcomings of the existing technology, and its main objective is to provide a common-mode integrated inductor that effectively solves the problems of complex structure, poor stability, and poor performance of existing integrated inductors, thereby achieving miniaturization, high stability, and excellent common-mode filtering performance of the inductor.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A common-mode integrated inductor, comprising:

[0009] Common mode magnetic core; the common mode magnetic core includes a main magnetic ring, the inner ring hole of the main magnetic ring being arranged vertically;

[0010] Differential mode magnetic core; the differential mode magnetic core is arranged on the outer periphery of the main magnetic ring, and the inner ring hole of the differential mode magnetic core is arranged to be continuous from top to bottom;

[0011] The first coil includes a first inverted U-shaped body, which spans one side of the main magnetic ring, with one end extending downward into the inner ring hole of the main magnetic ring and the other end extending downward along the outer side of the main magnetic ring.

[0012] The second coil includes a second inverted U-shaped body, which spans across the other side of the main magnetic ring and one side of the differential mode magnetic core, with one end extending downward into the inner ring hole of the main magnetic ring and the other end extending downward into the inner ring hole of the differential mode magnetic core.

[0013] As a preferred option, it also includes:

[0014] The encapsulation shell includes a bottom plate, a cylindrical body, and a top plate. The cylindrical body extends upward from the bottom plate, and the top plate has a through hole that extends vertically. The main magnetic ring is disposed inside the cylindrical body, and the top plate is encapsulated at the top opening of the cylindrical body. The through hole is directly opposite to the inner ring hole of the main magnetic ring.

[0015] As a preferred embodiment, the bottom plate is provided with a first pin hole, a second pin hole, a third pin hole and a fourth pin hole in sequence. The first pin hole and the fourth pin hole are both located on the outer periphery of the cylindrical part, and the first pin hole is located on the outer ring side of one side of the main magnetic ring, and the fourth pin hole is located on the outer ring side of the other side of the main magnetic ring. The second pin hole and the third pin hole are both located on the inner bottom of the cylindrical part.

[0016] The two pins of the first coil extend into the first pin hole and the second pin hole, respectively;

[0017] The two pins of the second coil extend into the third pin hole and the fourth pin hole, respectively.

[0018] As a preferred embodiment, after the two pins of the first coil extend into the first pin hole and the second pin hole respectively, and after the two pins of the second coil extend into the third pin hole and the fourth pin hole respectively, they are respectively glued and fixed to the base plate.

[0019] As a preferred embodiment, the differential mode magnetic core is arranged on the base plate and located on the outer periphery of the cylindrical body.

[0020] As a preferred embodiment, the top surface of the base plate is recessed into a glue-receiving groove corresponding to the outer periphery of the cylindrical body. The differential mode magnetic core is arranged above the glue-receiving groove, and glue is provided in the glue-receiving groove. The bottom of the differential mode magnetic core and the pins of the second coil that extend downward into the inner ring hole of the differential mode magnetic core are bonded and fixed to the base plate together by the glue.

[0021] As a preferred embodiment, the differential mode magnetic core includes two horizontally joined semi-ring magnetic cores, the bottoms of which are bonded together to the base plate with the adhesive.

[0022] As a preferred embodiment, the top surface of the top plate is provided with multiple sets of limiting parts, each set of limiting parts including at least two limiting parts arranged on opposite sides, so that a limiting groove is formed between the limiting parts on opposite sides, and the first coil and the second coil are respectively limited in the corresponding limiting groove.

[0023] As a preferred embodiment, the first inverted U-shaped body includes a first vertical portion, a first horizontal portion, and a second vertical portion connected in sequence. The first pin of the first coil is connected to the bottom end of the first vertical portion, and the second pin of the first coil is connected to the bottom end of the second vertical portion. The first vertical portion is located outside the main magnetic ring, the first horizontal portion is located at the top of one side of the main magnetic ring, and the second vertical portion is located in the inner ring hole of the main magnetic ring.

[0024] The second inverted U-shaped body includes a third vertical part, a second horizontal part, and a fourth vertical part connected in sequence. The third pin of the second coil is connected to the bottom end of the third vertical part, and the fourth pin of the second coil is connected to the bottom end of the fourth vertical part. The third vertical part is located in the inner ring hole of the main magnetic ring, the second horizontal part is located at the top of the other side of the main magnetic ring, and the fourth vertical part is located on the outside of the main magnetic ring.

[0025] As a preferred embodiment, the bottom plate and the cylindrical body are integrally formed, while the top plate and the cylindrical body are separately designed. After the main magnetic ring is installed, the top plate is sealed at the top opening of the cylindrical body.

[0026] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it has many advantages:

[0027] 1. Excellent common-mode and differential-mode filtering performance: Through optimized design of the magnetic core structure and coil, a good balance between the performance of common-mode and differential-mode inductors is achieved, which can effectively suppress common-mode and differential-mode electromagnetic interference signals in the power supply circuit, improve the electromagnetic compatibility of the power supply circuit, and ensure the stable operation of electronic equipment.

[0028] 2. Compact structure and small size: Integrating common-mode inductors and differential-mode inductors into one unit greatly reduces the overall size of the inductor, saves circuit board space, and is conducive to the miniaturization and thinning design of electronic devices.

[0029] 3. High stability: The integrated magnetic core structure and tight packaging design make the connection between the various components of the inductor firm, not easy to loosen or be damaged, which improves the stability and reliability of the inductor during use and reduces the risk of circuit failure due to component failure.

[0030] 4. Cost reduction: Compared with the traditional solution of setting common mode inductors and differential mode inductors separately, the common mode and differential mode integrated inductor of the present invention reduces the number of components and assembly steps, reduces material costs and production costs, improves production efficiency, and has better market competitiveness.

[0031] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0032] Figure 1 This is a perspective view of a common-mode integrated inductor according to an embodiment of the present invention;

[0033] Figure 2 This is another perspective view of a common-mode integrated inductor according to an embodiment of the present invention;

[0034] Figure 3 This is a top view of a common-mode integrated inductor according to an embodiment of the present invention;

[0035] Figure 4 This is an exploded view of a common-mode integrated inductor according to an embodiment of the present invention;

[0036] Figure 5 This is a front view of a common-mode integrated inductor according to an embodiment of the present invention;

[0037] Figure 6 This is a cross-sectional view of a common-mode integrated inductor according to an embodiment of the present invention. Detailed Implementation

[0038] Please refer to Figures 1 to 6 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0039] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0040] A common-mode integrated inductor, comprising:

[0041] A common-mode magnetic core is provided, comprising a main magnetic ring 10 with an inner ring hole 11 extending vertically. The main magnetic ring 10 has an integrated structure and is preferably made of a magnetic material with high permeability. The main magnetic ring 10 serves as the main body of the common-mode inductor's magnetic circuit, providing a closed magnetic circuit with low magnetic resistance to enhance the inductance and filtering effect of the common-mode inductor.

[0042] Differential mode magnetic core 20; the differential mode magnetic core 20 is arranged side by side on the outer periphery of the main magnetic ring 10, and the inner ring hole 21 of the differential mode magnetic core 20 is arranged vertically; the differential mode magnetic core 20 includes two horizontally joined semi-ring magnetic cores 201, which are equivalent to two horizontal U-shaped magnetic cores arranged on opposite sides. The differential mode magnetic core 20 is independently arranged on the outside of the main magnetic ring 10, which facilitates better and more reasonable design of the size, shape and air gap of the differential mode magnetic core 20, so as to accurately adjust the inductance and DC current saturation resistance of the differential mode inductor to meet the needs of different circuits.

[0043] A first coil 30; the first coil 30 includes a first inverted U-shaped body, which spans one side of the main magnetic ring 10, with one end extending downward into the inner ring hole of the main magnetic ring 10, and the other end extending downward along the outer side of the main magnetic ring 10, such that: the two pins of the first coil 30 are defined as a first pin 1 and a second pin 2, located in the lower inner ring region and the lower outer ring region of one side of the main magnetic ring 10, respectively; the first inverted U-shaped body includes a first vertical part 31, a first horizontal part 32 and a second vertical part 33 connected in sequence, the first pin 1 is connected to the bottom end of the first vertical part 31, and the second pin 2 is connected to the bottom end of the second vertical part 33; the first vertical part 31 is located on the outer side of the main magnetic ring 10, the first horizontal part 32 is located at the top of one side of the main magnetic ring 10, and the second vertical part 33 is located in the inner ring hole of the main magnetic ring 10.

[0044] The second coil 40 includes a second inverted U-shaped body, which spans across the other side of the main magnetic ring 10 and one side of the differential mode magnetic core 20, with one end extending downward into the inner ring hole of the main magnetic ring 10 and the other end extending downward into the inner ring hole of the differential mode magnetic core 20, such that: the two pins of the second coil 40 are defined as the third pin 3 and the fourth pin 4, respectively located in the lower inner ring region of the other side of the main magnetic ring 10 and the lower inner ring region of the differential mode magnetic core 20; preferably, the first coil 30, the... The second coil 40 is symmetrically arranged on both sides of the main magnetic ring 10; the second inverted U-shaped body includes a third vertical part 41, a second horizontal part 42 and a fourth vertical part 43 connected in sequence, the third pin 3 is connected to the bottom end of the third vertical part 41 and the fourth pin 4 is connected to the bottom end of the fourth vertical part 43; the third vertical part 41 is located in the inner ring hole of the main magnetic ring 10, the second horizontal part 42 is located at the top of the other side of the main magnetic ring 10 and the fourth vertical part 43 is located on the outside of the main magnetic ring 10.

[0045] The encapsulation shell 50 is typically made of plastic and includes a base plate 51, a cylindrical body 52, and a top plate 53. The cylindrical body 52 extends upward from the base plate 51, and the top plate 53 has a through-hole 531. The main magnetic ring 10 is disposed inside the cylindrical body 52, and the top plate 53 is encapsulated at the top opening of the cylindrical body 52. ​​The through-hole 531 is aligned with the inner ring hole 11 of the main magnetic ring 10, allowing the first coil 30 and the second coil 40 to be inserted across it. The base plate 51 and the cylindrical body 52 are integrally molded, while the top plate 53 is separate from the cylindrical body 52. ​​After the main magnetic ring 10 is inserted, the top plate 53 is encapsulated at the top opening of the cylindrical body 52. ​​This structural design of the encapsulation shell 50 has the advantages of easy manufacturing and assembly, and conforms to mature assembly processes. The base plate 51 is provided with a first pin hole 511, a second pin hole 512, a third pin hole 513, and a fourth pin hole 514 in sequence. The first pin hole 511 and the fourth pin hole 514 are both located on the outer periphery of the cylindrical body 52. ​​The first pin hole 511 is located on the outer ring side of one side of the main magnetic ring 10, and the fourth pin hole 514 is located on the outer ring side of the other side of the main magnetic ring 10. The second pin hole 512 and the third pin hole 513 are both located at the inner bottom of the cylindrical body 52. ​​The two pins of the first coil 30 extend into the first pin hole 511 and the second pin hole 512, respectively. The two pins of the second coil 40 extend into the third pin hole 513 and the fourth pin hole 514, respectively. The first coil 30 has two pins, first pin 1 and second pin 2, which extend into the first pin hole 511 and the second pin hole 512 respectively. The second coil 40 has two pins, third pin 3 and fourth pin 4, which extend into the third pin hole 513 and the fourth pin hole 514 respectively. They are then glued to the base plate 51, for example, by applying black glue to form a black glue block 60 on the base plate 51, which is used to bond and fix the corresponding pins to the base plate 51.

[0046] The differential mode magnetic core 20 is arranged on the base plate 51 and located on the outer periphery of the cylindrical body 52. ​​A glue-receiving groove 5101 is recessed on the top surface of the base plate 51 corresponding to the outer periphery of the cylindrical body 52. ​​The differential mode magnetic core 20 is arranged above the glue-receiving groove 5101, which contains glue. The bottom of the differential mode magnetic core 20 and the leads of the second coil 40 extending downwards into the inner ring hole of the differential mode magnetic core 20 are bonded and fixed to the base plate 51 together with the glue. The bottoms of the two semi-magnetic cores are bonded and fixed to the base plate 51 together with the glue (e.g., corresponding black glue 60), which is more conducive to fixing small-sized, independent differential mode magnetic cores 20, and is practical and reliable.

[0047] Furthermore, the top surface of the top plate portion 53 is provided with multiple sets of limiting portions, each set of limiting portions including at least two limiting portions 70 arranged on opposite sides, so that a limiting groove is formed between the limiting portions 70 on opposite sides, and the first coil 30 and the second coil 40 are respectively limited in the corresponding limiting groove to prevent displacement or short circuit; furthermore, pads can also be provided between the first coil 30, the second coil 40 and the top surface of the top plate portion 53 to form a gap.

[0048] Furthermore, the bottom surface of the base plate 51 is recessed with a positioning groove 5102 for accommodating and positioning the circuit board (PCB). The shape and size of the positioning groove 5102 match the circuit board. The circuit board is placed in the positioning groove 5102 and assembled with the package shell 50 to ensure precise positioning of the PCB. This is equivalent to integrating the circuit board at the bottom of the inductor, facilitating final application. The connection between each pin and the circuit board is stable and reliable, and there will be no loosening later. Each pin can be easily inserted and fixed directly onto the circuit board. Since each pin has been firmly bonded to the base plate by applying adhesive (black glue block), the subsequent installation and positioning of the circuit board achieves the goal of fixing each pin to the PCB within the PCB positioning groove 5102, completely avoiding the loosening problem that may occur after soldering the pins of traditional plug-in inductors.

[0049] Furthermore, the first coil 30 and the second coil 40 are symmetrically and tightly wound on the outside of the main magnetic ring 10. Under the action of a common-mode signal, the magnetic flux generated by the two windings of the first coil 30 and the second coil 40 cancels each other out, forming a common-mode magnetic flux loop only in the main magnetic ring 10; under the action of a differential-mode signal, the magnetic flux generated by the two windings of the first coil 30 and the second coil 40 superimposes each other, forming a differential-mode magnetic flux loop through the differential-mode magnetic core 20 structure, thereby realizing the functions of both common-mode and differential-mode inductors. The widths of the first coil 30 and the second coil 40 are the same.

[0050] In this invention application, the common-mode magnetic core provides a low-resistivity closed magnetic circuit through the integrated design of the main magnetic ring 10, focusing on efficient suppression of common-mode noise. The differential-mode magnetic core 20, through two independent half-rings arranged independently outside the main magnetic ring 10, allows for individual optimization of its size and shape (especially the air gap) to precisely control the differential-mode inductance and DC saturation resistance. This solves the problem of traditional integrated magnetic cores struggling to simultaneously optimize both common and differential modes, cleverly integrating common-mode and differential-mode functional units physically within a single package, achieving the design goal of a "molded" inductor. The first coil 30 is a pure common-mode path, employing an "inverted U-shaped" structure that allows it to pass only through the main magnetic ring 10 (both the inner and outer holes). This concentrates the magnetic field generated within the main magnetic ring 10, forming an ideal pure common-mode inductance path with pure functionality. The second coil 40 is designed as a common-mode + differential-mode path. Its "inverted U-shaped" structure has one end in the inner hole of the main magnetic ring 10 and the other end in the inner hole of the differential-mode magnetic core 20. This allows its current path to pass through the main magnetic ring 10 to participate in common-mode filtering and pass through the independent differential-mode magnetic core 20 to participate in differential-mode filtering. This realizes the use of one coil to provide excitation for both common-mode and differential-mode inductors. The structure is compact and efficient. Of course, the symmetrical arrangement of the first coil 30 and the second coil 40 is also beneficial to electrical balance.

[0051] The key design focus of this invention lies in achieving a good balance between the performance of common-mode and differential-mode inductors through optimized design of the magnetic core structure and coil. This effectively suppresses common-mode and differential-mode electromagnetic interference signals in power supply circuits, improves common-mode and differential-mode filtering performance, enhances the electromagnetic compatibility of power supply circuits, and ensures stable operation of electronic devices. Furthermore, by integrating the common-mode and differential-mode inductors into a single unit, the compact structure significantly reduces the overall size of the inductor, saving circuit board space and facilitating miniaturization and thinner design of electronic devices. Additionally, the integrated magnetic core structure and tight packaging design ensure secure connections between the various components of the inductor, preventing loosening or damage, improving the stability and reliability of the inductor during use, and reducing the risk of circuit failure due to component malfunction. Moreover, compared to the traditional approach of separating common-mode and differential-mode inductors, the integrated common-mode and differential-mode inductor of this invention reduces the number of components and assembly steps, lowers material and production costs, improves production efficiency, and offers better market competitiveness.

[0052] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A common-mode integrated inductor, characterized in that, Including: Common mode magnetic core; The common mode magnetic core includes a main magnetic ring, and the inner ring hole of the main magnetic ring is arranged to be open from top to bottom; Differential mode magnetic core; The differential mode magnetic core is arranged on the outer periphery of the main magnetic ring, and the inner ring hole of the differential mode magnetic core is arranged to be continuous from top to bottom; The first coil includes a first inverted U-shaped body, which spans one side of the main magnetic ring, with one end extending downward into the inner ring hole of the main magnetic ring and the other end extending downward along the outer side of the main magnetic ring; the first inverted U-shaped body includes a first vertical part, a first horizontal part and a second vertical part connected in sequence, the first pin of the first coil is connected to the bottom end of the first vertical part, and the second pin of the first coil is connected to the bottom end of the second vertical part; the first vertical part is located on the outer side of the main magnetic ring, the first horizontal part is located on the top of one side of the main magnetic ring, and the second vertical part is located in the inner ring hole of the main magnetic ring; The second coil includes a second inverted U-shaped body, which spans across the other side of the main magnetic ring and one side of the differential mode magnetic core, with one end extending downward into the inner ring hole of the main magnetic ring and the other end extending downward into the inner ring hole of the differential mode magnetic core; the second inverted U-shaped body includes a third vertical part, a second horizontal part and a fourth vertical part connected in sequence, the third pin of the second coil is connected to the bottom end of the third vertical part, and the fourth pin of the second coil is connected to the bottom end of the fourth vertical part; the third vertical part is located in the inner ring hole of the main magnetic ring, the second horizontal part is located at the top of the other side of the main magnetic ring, and the fourth vertical part is located on the outside of the main magnetic ring; The encapsulation housing includes a bottom plate, a cylindrical body, and a top plate. The cylindrical body extends upward from the bottom plate, and the top plate has a through hole that extends vertically. The main magnetic ring is disposed inside the cylindrical body, and the top plate is encapsulated at the top opening of the cylindrical body. The through hole is directly opposite to the inner ring hole of the main magnetic ring. The bottom plate is provided with a first pin hole, a second pin hole, a third pin hole, and a fourth pin hole in sequence. The first pin hole and the fourth pin hole are both located on the outer periphery of the cylindrical part. The first pin hole is located on the outer ring side of one side of the main magnetic ring, and the fourth pin hole is located on the outer ring side of the other side of the main magnetic ring. The second pin hole and the third pin hole are both located on the inner bottom of the cylindrical part. The two pins of the first coil extend into the first pin hole and the second pin hole, respectively. The two pins of the second coil extend into the third pin hole and the fourth pin hole, respectively.

2. The common-mode integrated inductor according to claim 1, characterized in that, After the two pins of the first coil are inserted into the first pin hole and the second pin hole respectively, and the two pins of the second coil are inserted into the third pin hole and the fourth pin hole respectively, they are fixed to the base plate with glue.

3. The common-mode integrated inductor according to claim 1 or 2, characterized in that, The differential mode magnetic core is arranged on the bottom plate and located on the outer periphery of the cylinder.

4. The common-mode integrated inductor according to claim 3, characterized in that, The top surface of the base plate is recessed into a glue-containing groove corresponding to the outer periphery of the cylinder. The differential mode magnetic core is arranged above the glue-containing groove, and glue is provided in the glue-containing groove. The bottom of the differential mode magnetic core and the pins of the second coil that extend downward into the inner ring hole of the differential mode magnetic core are glued and fixed to the base plate together.

5. The common-mode integrated inductor according to claim 4, characterized in that, The differential mode magnetic core consists of two horizontally joined semi-ring magnetic cores, the bottoms of which are glued together to the base plate.

6. The common-mode integrated inductor according to claim 1, characterized in that, The top surface of the top plate is provided with multiple sets of limiting parts. Each set of limiting parts includes at least two limiting parts arranged on opposite sides, so that a limiting groove is formed between the limiting parts on opposite sides, and the first coil and the second coil are respectively limited in the corresponding limiting groove.

7. The common-mode integrated inductor according to claim 1, characterized in that, The bottom plate and the cylindrical body are integrally molded, while the top plate and the cylindrical body are separate. After the main magnetic ring is installed, the top plate is sealed at the top opening of the cylindrical body.

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