Common-mode and differential-mode integrated inductor

Abstract

The utility model discloses a common-mode and differential-mode integrated inductor, which comprises a base provided with a separation positioning plate, two positioning grooves and four conductive pins; the magnetic core assembly comprises a closed-loop outer magnetic core and two open-loop inner magnetic cores, the two inner magnetic cores are located on the two opposite sides of the separation positioning plate respectively, the outer magnetic core comprises two outer longitudinal magnetic rods and two outer transverse magnetic rods, each inner magnetic core comprises an inner longitudinal magnetic rod, a center magnetic rod and two inner transverse magnetic rods, a magnetic gap notch is formed in the center of the center magnetic rod, and the two inner transverse magnetic rods are arranged in the center of the center magnetic rod. The central magnetic rod is propped against one side of the separation positioning plate; the two groups of coils are respectively arranged on the two positioning grooves, and each group of coils is wound outside the outer longitudinal magnetic rod and the inner longitudinal magnetic rod. The filter has the function of filtering common-mode noise and differential-mode noise at the same time, can effectively save space, can be widely applied to the field of electromagnetic interference filtering, can reduce loss when magnetic fields repel each other, and is high in consistency of hindering and suppressing the differential-mode noise when being used as two differential-mode inductors.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of inductance, particularly to a common-mode integrated inductor. BACKGROUND

[0002] In electronic circuits, inductance elements are widely used in filtering, energy storage, signal transmission and other fields as important passive components. Inductance, also known as inductor, can hinder the change of current.

[0003] In the traditional technology, the design of inductance often focuses on a single function, such as the realization of single differential mode inductance or common mode inductance. However, in scenarios where differential mode and common mode noise need to be processed simultaneously, the traditional solution is to use independent differential mode inductance and common mode inductance in combination, which not only increases the occupied space of the circuit board, making it difficult to meet the design requirements of modern lightweight products, but also increases the cost due to the use of a large number of inductors. SUMMARY

[0004] The utility model aims at at least solving one of the technical problems existing in the prior art. To this end, the utility model provides a common-mode integrated inductor, which can hinder and suppress common-mode noise and differential-mode noise, has a small occupied space, and can reduce the amount of inductance used, thereby reducing the cost.

[0005] According to the common-mode integrated inductor of the utility model embodiment, the common-mode integrated inductor comprises:

[0006] The base is provided with a partition positioning plate, two positioning grooves and four conductive pins, and the partition positioning plate is located between the two positioning grooves.

[0007] The magnetic core assembly comprises an outer magnetic core in a closed loop and two inner magnetic cores in open loops, the outer magnetic core surrounds the partition positioning plate and the two inner magnetic cores, the two inner magnetic cores are located on opposite sides of the partition positioning plate, the outer magnetic core comprises two outer longitudinal magnetic rods and two outer transverse magnetic rods, the two ends of each outer transverse magnetic rod are connected to the two outer longitudinal magnetic rods, the inner magnetic core comprises an inner longitudinal magnetic rod, a center magnetic rod and two inner transverse magnetic rods, the two ends of each inner transverse magnetic rod are connected to the inner longitudinal magnetic rod and the center magnetic rod, the center of the center magnetic rod is provided with a magnetic gap notch, the inner longitudinal magnetic rod abuts the inner side of the outer longitudinal magnetic rod, the inner transverse magnetic rod abuts the inner side of the outer transverse magnetic rod, and the center magnetic rod abuts one side of the partition positioning plate.

[0008] The coil is provided with two groups and is arranged on the two positioning grooves, each group of coils is wound outside the outer longitudinal magnetic rod and the inner longitudinal magnetic rod, the partition positioning plate and the two center magnetic rods are located between the two groups of coils, and the end part of each group of coils is connected to the corresponding conductive pin.

[0009] In the embodiment, the thickness of the partition positioning plate is less than the width of the center magnetic rod.

[0010] In the embodiment, the inner side of each outer transverse magnetic rod is provided with a supplementary magnetic block at the edge of the partition positioning plate, and the supplementary magnetic block abuts between the two inner transverse magnetic rods.

[0011] In the embodiment, the base is provided with a positioning fence, and the outer magnetic core is surrounded by the positioning fence.

[0012] In the embodiment, the base is further provided with a supporting block, and the outer magnetic core and the inner magnetic core are arranged on the supporting block.

[0013] In the embodiment, the supporting block is provided with two, and each pair of adjacent outer transverse magnetic rod and inner transverse magnetic rod abut on the corresponding supporting block.

[0014] In the embodiment, the outer magnetic core and the inner magnetic core are both manganese-zinc ferrite core structures.

[0015] In the embodiment, the coil is a flat copper wire winding with an insulating layer on the surface.

[0016] The embodiments of the utility model have at least the following beneficial effects:

[0017] By means of the two inner magnetic cores being sleeved in the outer magnetic core, the central magnetic rods of the two inner magnetic cores are used to form two differential mode inductors at the center of the magnetic core assembly, so that the filtering effect of hindering differential mode noise is formed, the closed loop outer magnetic core provides a stable magnetic flux path, which can be used as a common mode inductor to form a filtering effect of hindering common mode noise, the integrated inductor has the functions of filtering common mode noise and differential mode noise, can effectively save space, and can be widely applied to the field of electromagnetic interference filtering; By means of the magnetic gap gap at the center of the central magnetic rod, it can be effectively ensured that most of the magnetic induction lines are distributed in the path surrounded by the outer magnetic core when used as a common mode inductor, so that the filtering performance when used as a common mode inductor is effectively improved, and the filtering effect when used as a differential mode inductor is optimized; in addition, the partition positioning plate on the base is used for positioning the outer magnetic core and the two inner magnetic cores, which can effectively improve the reliability of the inductor structure, and the partition positioning plate can physically separate the two central magnetic rods, and the two opposite magnetic fields repel each other at the partition positioning plate when used as a differential mode inductor, under the guidance of the two physically separated central magnetic rods, the loss of magnetic energy when the magnetic fields repel each other can be effectively reduced, and the two magnetic fields can be uniformly distributed in the path surrounded by the two inner magnetic cores, the filtering performance for differential mode noise is good, and the consistency of hindering and suppressing differential mode noise when used as two differential mode inductors is high. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0019] Figure 1 It is a three-dimensional structure schematic view of the common differential mode integrated inductor of the utility model embodiment.

[0020] Figure 2 A perspective structure schematic view of the common-differential mode integrated inductor in another view angle of the embodiment of the utility model;

[0021] Figure 3 A top view structure schematic view of the common-differential mode integrated inductor;

[0022] Figure 4 An exploded structure schematic view of the common-differential mode integrated inductor;

[0023] Figure 5 A magnetic induction line distribution schematic view of the common-differential mode integrated inductor when applied as a common mode inductor;

[0024] Figure 6 A magnetic induction line distribution schematic view of the common-differential mode integrated inductor when applied as a differential mode inductor.

[0025] Reference signs:

[0026] Base 100, separation positioning plate 110, positioning groove 120, conductive pin 130, positioning fence 140, supporting block 150;

[0027] Magnetic core assembly 200, outer magnetic core 210, outer longitudinal magnetic rod 211, outer transverse magnetic rod 212, supplementary magnetic block 213, inner magnetic core 220, inner longitudinal magnetic rod 221, inner transverse magnetic rod 222, center magnetic rod 223, magnetic gap notch 224;

[0028] Coil 300. DETAILED DESCRIPTION

[0029] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.

[0030] In the description of the utility model, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, left, right, front, back, etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and cannot be understood as the limitation of the utility model indicated by the device or element with a specific orientation, a specific orientation structure and operation, therefore, cannot be understood as the limitation of the utility model.

[0031] In the description of the utility model, if it is described that the line sleeve and the support are only used for distinguishing the technical features for the purpose, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0032] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation and connection should be understood in a broad sense, and the skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0033] Inductance is also called inductor, which can hinder the change of current. In the traditional technology, the design of inductance often focuses on a single function, for example, the realization of single differential mode inductance or common mode inductance, however, in the scene which needs to process differential mode and common mode noise at the same time, the solution of traditional technology is to use independent differential mode inductance and common mode inductance in combination, which not only increases the occupied space of the circuit board, is difficult to meet the design requirements of modern light and thin products, and the use of a large number of inductances also increases the cost.

[0034] The existing inductance design mostly adopts single ring structure on the magnetic core structure, and these structures are often difficult to achieve ideal filtering effect and frequency response characteristics when dealing with complex electromagnetic environment. Therefore, developing an inductance element which can effectively suppress differential mode and common mode noise and has compact structure and high performance has become a problem to be solved at present.

[0035] The following refers to the accompanying drawings Figure 1 to the accompanying drawings Figure 6 The common mode and differential mode integrated inductance of the utility model embodiment can hinder and suppress common mode noise and differential mode noise, has small occupied space, can reduce the amount of inductance, and thus reduce the cost.

[0036] Referring to Figures 1 to 6 The common mode and differential mode integrated inductance of the utility model embodiment comprises:

[0037] The base 100 is provided with a separation positioning plate 110, two positioning grooves 120 and four conductive pins 130, the separation positioning plate 110 is located between the two positioning grooves 120, the two positioning grooves 120 are uniformly distributed on the top of the base 100, the four conductive pins 130 are uniformly distributed on the bottom of the base 100, preferably, two conductive pins 130 are arranged at the bottom of each positioning groove 120;

[0038] The magnetic core assembly 200 includes a closed-loop outer magnetic core 210 and two open-loop inner magnetic cores 220. A closed loop refers to a closed ring, while an open loop refers to a non-closed ring. The outer magnetic core 210 surrounds the partition positioning plate 110 and the two inner magnetic cores 220. The two inner magnetic cores 220 are located on opposite sides of the partition positioning plate 110 and are specifically symmetrical about the partition positioning plate 110. The outer magnetic core 210 includes two outer longitudinal magnetic rods 211 and two outer transverse magnetic rods 212 forming a square closed loop. The two ends of each outer transverse magnetic rod 212 are respectively connected to the ends of the two outer longitudinal magnetic rods 211, so that the outer magnetic core 210 forms a square closed loop. For each inner magnetic core 220, the inner magnetic core 220 includes an inner longitudinal magnetic rod 220 forming a C-shaped open loop. 1. A central magnetic rod 223 and two inner transverse magnetic rods 222. The two ends of each inner transverse magnetic rod 222 are connected to the ends of the inner longitudinal magnetic rod 221 and the central magnetic rod 223, respectively. A magnetic gap notch 224 is provided at the center of the central magnetic rod 223. The magnetic gap can also be understood as an air gap. The inner longitudinal magnetic rod 221 abuts against the inner side of the outer longitudinal magnetic rod 211, the inner transverse magnetic rod 222 abuts against the inner side of the outer transverse magnetic rod 212, and the central magnetic rod 223 abuts against one side of the partition positioning plate 110. The central magnetic rods 223 of the two inner magnetic cores 220 abut against the opposite sides of the partition positioning plate 110, and the two central magnetic rods 223 are physically separated by the partition positioning plate 110. When used as a differential mode inductor, it can reduce the magnetic energy loss caused by mutual repulsion between the two magnetic fields.

[0039] Two sets of coils 300 are provided and are respectively located on two positioning slots 120. Each set of coils 300 is wound around the outer longitudinal magnetic rod 211 and the inner longitudinal magnetic rod 221. That is, the outer longitudinal magnetic rod 211 and the inner longitudinal magnetic rod 221 on the same side are passed through the same coil 300. The winding directions of the two sets of coils 300 are opposite. The separating positioning plate 110 and the two central magnetic rods 223 are located between the two sets of coils 300. The end of each set of coils 300 is connected to a corresponding conductive pin 130. The four ends of the two sets of coils 300 are respectively connected to four conductive pins 130.

[0040] This common-differential integrated inductor mainly includes the following two operating modes:

[0041] When used as a common-mode inductor: the two coils 300 form magnetic field lines in the same direction, refer to... Figure 5 As shown, this creates a magnetic field superposition effect, which can effectively impede common-mode noise. Due to the effect of the magnetic gap 224, only a small portion of the magnetic field lines pass through the inner longitudinal magnetic rod 221, which can effectively ensure the impediment effect of common-mode noise, thereby improving the performance when used as a common-mode inductor.

[0042] When used as a differential-mode inductor: the two coils 300 form magnetic field lines in opposite directions, i.e., opposite directions. (Refer to...) Figure 6As shown, thereby forming two opposite magnetic fields, the two magnetic fields repel each other at the partitioning positioning plate 110, so that the magnetic lines pass through the center magnetic rod 223 and return to the corresponding inner horizontal magnetic rod 222 and inner vertical magnetic rod 221, thereby forming an obstacle effect on differential mode noise, and since the two center magnetic rods 223 are physically separated by the partitioning positioning plate 110, it can be ensured that two groups of uniformly distributed magnetic lines are formed, thereby effectively improving the obstacle effect on differential mode noise, thereby improving the performance when used as a differential mode inductor.

[0043] By sleeving the two inner magnetic cores 220 in the outer magnetic core 210, the center magnetic rods 223 of the two inner magnetic cores 220 are used to form two differential mode inductors at the center of the magnetic core assembly 200, thereby forming a filtering effect that impedes differential mode noise, and the closed-loop outer magnetic core 210 provides a stable magnetic flux path that can be used as a common mode inductor to form a filtering effect that impedes common mode noise. This integrated inductor simultaneously has the function of filtering common mode noise and differential mode noise, can avoid the use of multiple independent inductors in application products, can effectively save space, can meet the design requirements of thinness, and can reduce costs, and can be widely used in the field of electromagnetic interference filtering; through the magnetic gap gap 224 located at the center of the center magnetic rod 223, it can effectively ensure that most of the magnetic lines are distributed in the path around the outer magnetic core 210 when used as a common mode inductor, thereby effectively improving the filtering performance when used as a common mode inductor, and optimizing the filtering effect when used as a differential mode inductor, achieving excellent filtering performance within a wide frequency band; in addition, the partitioning positioning plate 110 on the base 100 is used to position the outer magnetic core 210 and the two inner magnetic cores 220, which can effectively improve the reliability of the inductor structure, and the partitioning positioning plate 110 can physically separate the two center magnetic rods 223, and when used as a differential mode inductor, the two opposite magnetic fields repel each other at the partitioning positioning plate 110, guided by the two physically separated center magnetic rods 223, it can effectively reduce the loss of magnetic energy when the magnetic fields repel each other, and can make the two magnetic fields uniformly distributed in the path around the two inner magnetic cores 220, i.e. each magnetic field flows through the corresponding inner magnetic core 220 and magnetic gap gap 224, the magnetic field strength of the two differential mode inductors is close, and a relatively independent filtering effect is formed, and when used as a differential mode inductor, the filtering performance on differential mode noise is good, and when used as two differential mode inductors, the consistency of the obstacle suppression on differential mode noise is high.

[0044] It can be understood that the thickness of the partition positioning plate 110 is smaller than the width of the center magnetic rod 223, which can ensure that the partition positioning plate 110 is thin enough, which not only effectively reduces the weight of the integrated inductor, but also effectively avoids that the center magnetic rods 223 of the two inner magnetic cores 220 are too far apart to affect the interaction between the two magnetic fields, ensures that most of the magnetic flux lines pass through the center magnetic rod 223 in the differential mode state, and thus ensures the suppression performance of differential mode noise when the integrated inductor is applied as a differential mode inductor.

[0045] Specifically, the thickness of the partition positioning plate 110 is d, and the width of the center magnetic rod 223 is D, d < 0.5D.

[0046] It can be understood that the center of each outer transverse magnetic rod 212 is provided with a supplementary magnetic block 213 located at the edge of the partition positioning plate 110, and the supplementary magnetic block 213 abuts between the corresponding two inner transverse magnetic rods 222 of the two inner magnetic cores 220. By connecting the two groups of corresponding inner transverse magnetic rods 222 through the two supplementary magnetic blocks 213, it can be ensured that the magnetic flux lines in the common mode state smoothly pass through the corresponding adjacent two inner transverse magnetic rods 222 of the two inner magnetic cores 220, thereby ensuring the impedance performance when the integrated inductor is applied as a common mode inductor.

[0047] When used as a common mode inductor, the magnetic field is distributed in the abutting inner transverse magnetic rods 222 and outer transverse magnetic rods 212, and the abutting inner longitudinal magnetic rods 221 and outer longitudinal magnetic rods 211.

[0048] It can be understood that the base 100 is also provided with a positioning fence 140 for positioning the outer magnetic core 210, and the positioning fence 140 surrounds the outer magnetic core 210. By the positioning fence 140, the stability of the relative position between the outer magnetic core 210 and the base 100 can be further improved. Since the inner magnetic core 220 is abutted in the outer magnetic core 210 and abutted with the partition positioning plate 110, the stability of the relative position between the base 100 and the magnetic core assembly 200 can be effectively improved.

[0049] Specifically, the positioning fence 140 includes four L-shaped fence blocks, and the four fence blocks are clamped and positioned at the four corners of the outer magnetic core 210.

[0050] It can be understood that the base 100 is also provided with a supporting block 150 for supporting the outer magnetic core 210 and the inner magnetic core 220. The outer magnetic core 210 and the two inner magnetic cores 220 are arranged on the supporting block 150. By supporting the magnetic core assembly 200 above the base 100 through the supporting block 150, sufficient space can be provided for the winding of the coil 300, which can effectively reduce the acting force borne by the coil 300 and effectively improve the stability of the overall structure of the integrated inductor.

[0051] It can be understood that the supporting block 150 is provided with two, and each pair of adjacent outer transverse magnetic rod 212 and inner transverse magnetic rod 222 abuts on the corresponding supporting block 150, that is, two supporting blocks 150 are supported under two pairs of adjacent outer transverse magnetic rod 212 and inner transverse magnetic rod 222, and two supporting blocks 150 avoid two coils 300, which can effectively improve the position stability of the magnetic core assembly 200.

[0052] It can be understood that the outer magnetic core 210 and the inner magnetic core 220 are both manganese-zinc ferrite core structures or nickel-zinc ferrite core structures, and the base 100 is an insulating non-magnetic seat, which can effectively avoid the influence of the base 100 on the work of the coil 300 and the magnetic core assembly 200, thereby effectively improving the reliability of the filtering suppression effect of the integrated inductor.

[0053] It can be understood that the coil 300 is a flat copper wire winding with an insulating layer on the surface, and the flat copper wire has good conductivity and heat dissipation performance, and is not easy to overheat when carrying large current, which can effectively improve the high load performance of the integrated inductor, has strong application flexibility and long service life.

[0054] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A common-differential-mode integrated inductor, characterized by, The application relates to a magnetic core assembly and a coil. The base (100) is provided with a partition positioning plate (110), two positioning grooves (120) and four conductive pins (130), the partition positioning plate (110) is located between the two positioning grooves (120); The magnetic core assembly (200) comprises a closed-loop outer magnetic core (210) and two open-loop inner magnetic cores (220), the outer magnetic core (210) surrounds the partition positioning plate (110) and the two inner magnetic cores (220) outside, the two inner magnetic cores (220) are respectively located on opposite sides of the partition positioning plate (110), the outer magnetic core (210) comprises two outer longitudinal magnetic rods (211) and two outer transverse magnetic rods (212), the two ends of each outer transverse magnetic rod (212) are connected with the two outer longitudinal magnetic rods (211) respectively, the inner magnetic core (220) comprises an inner longitudinal magnetic rod (221), a center magnetic rod (223) and two inner transverse magnetic rods (222), the two ends of each inner transverse magnetic rod (222) are connected with the inner longitudinal magnetic rod (221) and the center magnetic rod (223) respectively, the center of the center magnetic rod (223) is provided with a magnetic gap notch (224), the inner longitudinal magnetic rod (221) abuts against the inner side of the outer longitudinal magnetic rod (211), the inner transverse magnetic rod (222) abuts against the inner side of the outer transverse magnetic rod (212), and the center magnetic rod (223) abuts against one side of the partition positioning plate (110); The coil (300) is provided with two groups and is arranged on the two positioning grooves (120) respectively, each group of the coil (300) is arranged outside the outer longitudinal magnetic rod (211) and the inner longitudinal magnetic rod (221), and the partition positioning plate (110) and the two center magnetic rods (223) are located between the two groups of the coil (300), and the end part of each group of the coil (300) is connected with the corresponding conductive pin (130).

2. The common-differential-mode integrated inductor of claim 1, wherein, The thickness of the partition positioning plate (110) is smaller than the width of the center magnetic rod (223).

3. The common-differential-mode integrated inductor of claim 1, wherein, The inner side of each outer transverse magnetic rod (212) is provided with a supplementary magnetic block (213) located at the edge of the partition positioning plate (110), and the supplementary magnetic block (213) abuts between the two inner transverse magnetic rods (222).

4. The common-differential-mode integrated inductor of claim 1, wherein, The base (100) is provided with a positioning fence (140), and the positioning fence (140) surrounds the outer magnetic core (210) outside.

5. A common-differential mode integrated inductor according to claim 4, characterized in that, The base (100) is further provided with a supporting block (150), and the outer magnetic core (210) and the inner magnetic core (220) are arranged on the supporting block (150).

6. A common-differential mode integrated inductor according to claim 5, characterized in that, The supporting block (150) is provided with two, and each pair of adjacent outer transverse magnetic rods (212) and inner transverse magnetic rods (222) abut on the corresponding supporting block (150).

7. The common-differential-mode integrated inductor of claim 1, wherein, The outer magnetic core (210) and the inner magnetic core (220) are both manganese-zinc ferrite magnetic core structures.

8. The common-differential-mode integrated inductor of claim 1, wherein, The coil (300) is a flat copper wire winding with an insulating layer on the surface.

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