Novel common-mode and differential-mode inductor structure

Abstract

The utility model discloses a novel common-mode and differential-mode inductor structure which sequentially comprises an upper magnetic core, a coil framework and a lower magnetic core from top to bottom, an upper flange on the coil framework is provided with a boss or a rib, the boss or the rib is arranged at the joint of an inner coil and an outer coil, and when the inner coil is wound to the tail end of the inner coil from bottom to top, the boss or the rib is arranged at the joint of the inner coil and the outer coil. The boss or the rib serves as the step of the inner coil to be connected with the outer coil. The upper flange and the lower flange of the coil framework are provided with the isolation bosses, and the bosses are arranged at the starting position of the inner coil and used for supporting the starting part of the tail coil of the outer coil, so that a gap is reserved between the bosses and the starting part of the first coil of the inner coil, crossing and rubbing are avoided, wire arrangement is stable, coil quality is good, the coil framework is suitable for automatic production, power density is high, power loss is low, and temperature rise is lower. The coil winding adopts a short and narrow waist-shaped structure to carry out flat wire two-layer winding, and is matched with the coil framework, the upper magnetic core and the lower magnetic core for use, so that the length of a single turn of winding is longer, and the differential mode sensing value required by common-differential mode integration can be greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a novel common mode differential mode inductance structure, especially to a novel common mode differential mode inductance structure which is compact in structure and suitable for square enameled wire. BACKGROUND

[0002] The left and right sides of the inductance element main part are coils respectively, the wire material design of the coil adopts square enameled wire, relative to circular enameled wire, the wire cross section area increases greatly, the temperature rise can be reduced in corresponding proportion, but the square wire has an angle, the winding guide is poor, the winding can cross and scratch the wire, how to overcome the above problems is the problem to be solved by the utility model. SUMMARY

[0003] The utility model provides a novel common mode differential mode inductance structure which is compact in structure and suitable for square enameled wire.

[0004] In order to solve the above technical problem, the technical scheme of the utility model is as follows: a novel common mode differential mode inductance structure, the innovation point of which is that the novel common mode differential mode inductance structure comprises an upper magnetic core, a coil framework and a lower magnetic core from top to bottom in sequence, the coil framework is wound with a coil winding composed of an inner coil and an outer coil, and the coil winding is square enameled wire.

[0005] The coil framework is a hollow sleeve structure in the shape of a waist, the sleeve structure is provided with a recessed area on the outer circular surface of the sleeve structure for winding the coil winding, and the upper and lower sides of the recessed area form an upper flange and a lower flange; the upper magnetic core extends into the hollow part of the coil framework from top to bottom, and the lower magnetic core extends into the hollow part of the coil framework from bottom to top.

[0006] The upper flange of the coil framework is provided with a boss or a rib below the upper flange, the boss or the rib is arranged at the joint of the inner coil and the outer coil, and the boss or the rib serves as a step for connecting the inner coil and the outer coil when the inner coil is wound from bottom to top to the end of the inner coil.

[0007] The boss or the rib comprises a first inclined surface structure, and the inclination direction of the first inclined surface structure gradually increases from the advancing direction of the inner coil.

[0008] Preferably, the lower flange of the coil framework is provided with a first notch and a second notch for the wire outlet pin and the wire inlet pin of the coil winding to pass through respectively;

[0009] The lower flange is provided with an isolation boss above the lower flange, the outer coil passes through the second notch after passing through the isolation boss, the isolation boss comprises a second inclined surface structure, and the inclination direction of the second inclined surface structure gradually increases from the advancing direction of the wire outlet pin.

[0010] Preferably, the novel common-mode inductance structure further comprises a bottom plate below the lower magnetic core, the bottom plate is provided with a first mounting hole and a second mounting hole for the outgoing terminal pin and the incoming terminal pin of the coil winding to pass through and be fixed by point gluing respectively, and the first notch and the second notch correspond to the first mounting hole and the second mounting hole respectively.

[0011] Preferably, the first mounting hole and the second mounting hole on the bottom plate are respectively provided with a first baffle and a second baffle vertically arranged at the positions of the first mounting hole and the second mounting hole, and the lower magnetic core is located inside the first baffle and the second baffle.

[0012] Preferably, the first mounting hole and the second mounting hole on the bottom plate are respectively provided with a first rib and a second rib above the bottom plate, the first rib is uniformly distributed around the first mounting hole, and the second rib is uniformly distributed around the second mounting hole.

[0013] Preferably, the hollow part of the coil former is in a waist shape, and the parts of the upper magnetic core and the lower magnetic core extending into the coil former are also in a waist shape consistent with the shape of the hollow part of the coil former.

[0014] Preferably, the upper magnetic core is provided with an upper top plate above the upper magnetic core, and the area of the upper top plate is greater than the area of the upper magnetic core.

[0015] The upper magnetic core and the upper top plate are an integral structure, and the upper top plate is made of the same pre-magnetization material as the upper magnetic core.

[0016] Preferably, the lower magnetic core is provided with a lower bottom plate below the lower magnetic core, and the area of the lower bottom plate is greater than the area of the lower magnetic core.

[0017] The lower magnetic core and the lower bottom plate are an integral structure, and the lower bottom plate is made of the same pre-magnetization material as the lower magnetic core.

[0018] Preferably, at least two coil forms are arranged between the upper magnetic core and the lower magnetic core, and a partition plate is arranged between the coil forms and adjacent coil forms to separate them.

[0019] Preferably, the partition plate is arranged on the upper magnetic core or the lower magnetic core.

[0020] The utility model discloses a kind of novel common differential mode inductance structures, including upper magnetic core, coil skeleton, coil winding, lower magnetic core and bottom plate, the structure of the utility model discloses is as follows: the upper magnetic core is arranged in the upper part of coil skeleton, and the lower magnetic core is arranged in the lower part of coil skeleton, and the bottom plate is arranged in the lower part of lower magnetic core. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be described in further detail below in combination with the drawings and specific embodiment.

[0022] Figure 1 It is a perspective view of a novel common differential mode inductance structure of the utility model.

[0023] Figure 2 It is a perspective exploded view of a novel common differential mode inductance structure of the utility model.

[0024] Figure 3 It is a structure schematic view of a novel common differential mode inductance structure of the utility model.

[0025] Figure 4 It is a structure schematic view of upper magnetic core in a novel common differential mode inductance structure of the utility model.

[0026] Figure 5 It is a top structure schematic view of coil skeleton in a novel common differential mode inductance structure of the utility model.

[0027] Figure 6 It is a bottom structure schematic view of coil skeleton in a novel common differential mode inductance structure of the utility model.

[0028] Figure 7 It is a structure schematic view of lower magnetic core and partition plate in a novel common differential mode inductance structure of the utility model.

[0029] Figure 8 It is a structure schematic view of bottom plate in a novel common differential mode inductance structure of the utility model.

[0030] In the drawing: 1-upper magnetic core, 2-coil skeleton, 21-upper flange, 22-lower flange, 23-boss or rib, 24-first gap, 25-second gap, 26-isolation boss, 3-lower magnetic core, 4-coil winding, 41-wire end pin, 42-wire end pin, 5-bottom plate, 51-first mounting hole, 52-second mounting hole, 53-first baffle, 54-second baffle, 55-first rib, 56-second rib, 6-upper top plate, 7-lower bottom plate, 8-partition plate. DETAILED DESCRIPTION

[0031] The novel common-mode inductance structure comprises, from top to bottom, an upper magnetic core 1, a coil former 2, and a lower magnetic core 3; the coil former 2 is wound with a coil winding 4 composed of an inner coil and an outer coil, and the coil winding 4 is square enameled wire; the coil former 2 is a hollow sleeve structure in the shape of a waist, and the sleeve structure is provided with a recessed area on the outer circumferential surface of the sleeve structure for winding the coil winding 4, and the upper and lower sides of the recessed area form an upper flange 21 and a lower flange 22; the upper magnetic core 1 extends into the hollow part of the coil former 2 from top to bottom, and the lower magnetic core 3 extends into the hollow part of the coil former 2 from bottom to top; the upper flange 21 of the coil former 2 is provided with a boss or rib 23 below the upper flange 21, and the boss or rib 23 is arranged at the joint of the inner coil and the outer coil, and when the inner coil is wound from bottom to top to the end of the inner coil, the boss or rib 23 serves as a step for connecting the inner coil and the outer coil; the boss or rib 23 comprises a first inclined surface structure, and the inclination direction of the first inclined surface structure gradually increases from the forward direction of the inner coil.

[0032] By adopting the above structure, the boss or rib 23 arranged at the end of the inner coil of the coil former 2 serves as a step for connecting the inner coil and the outer coil when the arrangement of the inner coil is completed, so that the wire arrangement is stable, the coil quality is good, it is suitable for automatic production, the window utilization rate is high, the power density is high, the power loss is low, and the temperature rise is lower. The coil winding 4 is wound in two layers by adopting a short and narrow waist-shaped structure, and is used in combination with the coil former 2, the upper magnetic core 1 and the lower magnetic core 3, so that the single-turn length of the winding is longer, and the differential-mode inductance required by the common-mode integrated circuit can be greatly improved.

[0033] The boss or rib 23 has the following functions: the inner coil is guided to be wound by the boss or rib 23 before the end of the inner coil, so as to avoid the problem of scratching the wire by the outer coil and the inner coil and the problem of cross arrangement of the wire, and to avoid the problem of overlarge wire package which is difficult to assemble the magnetic core and the partition plate 8.

[0034] In order to avoid the problem of scratching the wire by the outer coil and the inner coil, the isolation boss 26 arranged between the inner coil and the outer coil has the following functions: when the inner coil is wound to the outer coil, the end coil of the outer coil is easy to scratch the first coil of the inner coil, so the isolation boss 26 is designed to support the end coil of the outer coil (the second layer) and keep a gap with the first coil of the inner coil (the first layer), so as to avoid the problem of scratching.

[0035] Leakage inductance reference formula:

[0036]

[0037] Temperature rise formula:

[0038]

[0039] The lower flange 22 of the coil former 2 is provided with a first gap 24 and a second gap 25 for the wire outlet pin 42 and the wire inlet pin 41 of the coil winding 4 to pass through, respectively; the lower flange 22 is provided with an isolation boss 26 above the lower flange 22, the outer coil passes through the second gap 25 after passing through the isolation boss 26, the isolation boss 26 comprises a second inclined surface structure, and the inclination direction of the second inclined surface structure gradually increases from the wire outlet pin 42. The isolation boss 26 is provided when the outer coil is wound at the wire outlet, so that the wire is stable, the coil quality is good, it is suitable for automatic production, the window utilization rate is high, the power density is high, the power loss is low, and the temperature rise is lower.

[0040] The novel common-mode inductor structure further comprises a bottom plate 5 below the lower magnetic core 3, the bottom plate 5 is provided with a first mounting hole 51 and a second mounting hole 52 for the wire outlet pin 42 and the wire inlet pin 41 of the coil winding 4 to pass through and be fixed by glue, respectively, and the first gap 24 and the second gap 25 correspond to the first mounting hole 51 and the second mounting hole 52, respectively.

[0041] The first mounting hole 51 and the second mounting hole 52 of the bottom plate 5 are vertically provided with a first baffle 53 and a second baffle 54, respectively, and the lower magnetic core 3 is located inside the first baffle 53 and the second baffle 54. The first baffle 53 and the second baffle 54 are provided so that the coil winding 4 meets the corresponding isolation requirements.

[0042] The first mounting hole 51 and the second mounting hole 52 of the bottom plate 5 are provided with a first rib 55 and a second rib 56 above the bottom plate 5, respectively, the first rib 55 is uniformly distributed around the first mounting hole 51, and the second rib 56 is uniformly distributed around the second mounting hole 52. The first rib 55 and the second rib 56 increase the bonding surface area of the wire inlet pin 41 and the wire outlet pin 42 with the bottom plate 5, so that the glue bonding is more firm, thereby improving the mechanical strength of the device and meeting the vehicle application requirements.

[0043] The hollow part of the coil former 2 is in a waist shape, and the parts of the upper magnetic core 1 and the lower magnetic core 3 extending into the coil former 2 are also in a waist shape consistent with the shape of the hollow part of the coil former 2. The coil, the upper magnetic core 1 and the lower magnetic core 3 adopt a waist shape, which makes the single-turn length longer, the leakage inductance improved, the combined contact surface of the upper magnetic core 1 and the coil winding 4 and the lower magnetic core 3 and the coil winding 4 larger, the square enameled wire cross-sectional area of the coil winding 4 larger, and the outer surface area of the upper magnetic core 1 and the lower magnetic core 3 larger, so that the heat dissipation is better and the temperature rise is lower.

[0044] The upper magnetic core 1 is provided with an upper top plate 6 above the upper magnetic core 1, and the area of the upper top plate 6 is greater than that of the upper magnetic core 1; the upper magnetic core 1 and the upper top plate 6 are of an integral structure, and the upper top plate 6 is of the same pre-magnetization material as the upper magnetic core 1. The lower magnetic core 3 is provided with a lower bottom plate 7 below the lower magnetic core 3, and the area of the lower bottom plate 7 is greater than that of the lower magnetic core 3; the lower magnetic core 3 and the lower bottom plate 7 are of an integral structure, and the lower bottom plate 7 is of the same pre-magnetization material as the lower magnetic core 3. The upper magnetic core 1 and the lower magnetic core 3 adopt a short and flat structure design to reduce the height, and the upper top plate 6 and the lower bottom plate 7 are arranged outside the closed loop to increase the bypass magnetic flux to improve the leakage flux, thereby improving the leakage inductance.

[0045] The above-mentioned upper magnetic core 1 and lower magnetic core 3 are provided with at least two coil frames 2, and the upper magnetic core 1 and the lower magnetic core 3 are provided with a partition plate 8 separating the coil frame 2 and the adjacent coil frame 2, and the partition plate 8 is arranged on the upper magnetic core 1 or the lower magnetic core 3. The coil winding 4 is insulated from the frame between the upper magnetic core 1 and the lower magnetic core 3, and the adjacent coil windings 4 are isolated by the partition plate 8.

[0046] The above embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A novel common mode inductance structure characterized by: The novel common-mode inductor structure comprises, from top to bottom, an upper magnetic core, a coil former, and a lower magnetic core, the coil former is wound with a coil winding composed of an inner coil and an outer coil, and the coil winding is square enameled wire; The coil former is a hollow sleeve structure in the shape of a waist, the sleeve structure is provided with a recessed area on the outer circular surface of the sleeve structure for winding the coil winding, and the upper and lower sides of the recessed area form an upper flange and a lower flange; the upper magnetic core extends into the hollow part of the coil former from top to bottom, and the lower magnetic core extends into the hollow part of the coil former from bottom to top; The upper flange of the coil former is provided with a boss or a rib below the upper flange, the boss or the rib is arranged at the junction of the inner coil and the outer coil, and the boss or the rib serves as a step for the inner coil to connect the outer coil when the inner coil is wound from bottom to top to the end of the inner coil; The boss or the rib comprises a first inclined surface structure, and the inclination direction of the first inclined surface structure gradually increases from the advancing direction of the inner coil.

2. A novel common mode inductor structure as claimed in claim 1, wherein: The lower flange of the coil former is provided with a first notch and a second notch for the outgoing end pin and the incoming end pin of the coil winding to pass through, respectively; The lower flange is provided with an isolation boss above the lower flange, the outer coil passes through the isolation boss and then passes through the second notch, the isolation boss comprises a second inclined surface structure, and the inclination direction of the second inclined surface structure gradually increases from the advancing direction of the outgoing end pin.

3. A novel common mode inductor structure as claimed in claim 2, wherein: The novel common-mode inductor structure further comprises a bottom plate below the lower magnetic core, the bottom plate is provided with a first mounting hole and a second mounting hole for the outgoing end pin and the incoming end pin of the coil winding to pass through and be fixed by glue, respectively, and the first notch and the second notch correspond to the first mounting hole and the second mounting hole, respectively.

4. A novel common mode inductor structure as claimed in claim 3, wherein: First and second baffles are vertically arranged at the positions of the first and second mounting holes on the bottom plate, respectively, and the lower magnetic core is located inside the first and second baffles.

5. A novel common mode inductor structure as claimed in claim 3, wherein: First and second ribs are arranged above the bottom plate at the positions of the first and second mounting holes on the bottom plate, respectively, the first rib is evenly distributed around the first mounting hole, and the second rib is evenly distributed around the second mounting hole.

6. A novel common mode inductor structure as claimed in claim 1, wherein: The hollow part of the coil former is in the shape of a waist, and the parts of the upper magnetic core and the lower magnetic core extending into the coil former are also in the shape of a waist consistent with the shape of the hollow part of the coil former.

7. A novel common mode inductor structure as claimed in claim 1, wherein: The upper magnetic core is provided with an upper top plate above the upper magnetic core, and the area of the upper top plate is greater than that of the upper magnetic core; The upper magnetic core and the upper top plate are an integral structure, and the upper top plate is made of the same pre-magnetization material as the upper magnetic core.

8. A novel common mode inductor structure as claimed in claim 1, wherein: The lower magnetic core is provided with a lower bottom plate below the lower magnetic core, and the area of the lower bottom plate is greater than that of the lower magnetic core; The lower magnetic core and the lower bottom plate are an integral structure, and the lower bottom plate is made of the same pre-magnetization material as the lower magnetic core.

9. A novel common mode inductor structure as claimed in claim 1, wherein: There are at least two coil formers arranged between the upper magnetic core and the lower magnetic core, and a partition plate is arranged between the coil formers and adjacent coil formers to separate them.

10. A novel common mode inductor structure as claimed in claim 9, wherein: The partition is arranged on the upper magnetic core or the lower magnetic core. The partition is arranged on the upper magnetic core or the lower magnetic core.

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