CN222168113U - High-power common mode choke coil and switching power supply - Google Patents

Abstract

The utility model relates to the technical field related to magnetic devices and provides a high-power common mode choke coil and a switching power supply, which comprise an annular magnetic core and a plurality of coil rings, wherein one end of each coil ring is provided with an opening, the size of the opening is not smaller than the thickness of the annular magnetic core, and the plurality of coil rings are connected end to form a spiral coil structure to encircle the annular magnetic core. The coil is divided into the coil rings, the spiral coil is arranged in a metal component assembly mode, and the winding problem of the high-power common mode choke coil is solved.

Description

High-power common mode choke coil and switching power supply

Technical Field

The utility model relates to the technical field of magnetic devices, in particular to a high-power common mode choke coil and a switching power supply.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

Common mode inductors (CMC), also known as common mode chokes, are commonly used in switching power supplies to filter common mode electromagnetic interference signals. In the circuit, the common mode inductance also plays a role of EMI filtering for suppressing common mode noise generated from the line and preventing high frequency signals from radiating outwards. The power of the magnetic element is mainly determined by the product of the effective area of the magnetic circuit of the magnet and the area of the window (area of the conductor). In the limited volume, the conductor area of the common mode choke coil is increased, so that the current passing capability can be improved, and the common mode choke coil is suitable for filtering of EIM circuits of high-power supplies.

The inventor finds that, because the magnetic permeability of the combined magnetic core is reduced after the magnetic core is divided, most of the existing high-power common-mode inductors generally adopt an integrally arranged annular magnetic core, and particularly adopt a scheme of annular magnetic core and flat wire, a flat wire is adopted to wind a coil, a flat wire lead is flat, an inner hole of the magnetic core is required to be large enough, and the common-mode inductors are outwards increased in width after winding, so that the length of the device in the transverse and longitudinal directions is increased. If a round wire is selected, when the diameter of the wire is not smaller than 4mm, a large pulling force is needed to wind the wire on the annular magnetic core, the ferrite annular magnetic core with high magnetic conductivity is used for the common-mode inductor, the annular magnetic core can bear huge stress in the winding process, if the shell is not protected, the magnetic conductivity can be rapidly reduced, the inductance is reduced, the impedance of the common-mode inductor is reduced, so that the impedance is reduced, the filtering effect is weakened, and the volume is increased by increasing the shell.

Disclosure of utility model

In order to solve the problems, the utility model provides a high-power common mode choke coil and a switching power supply, wherein the coil is divided into coil rings, and the spiral coil is arranged in a metal component assembly mode, so that the winding problem of the high-power common mode choke coil is solved.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

One or more embodiments provide a high-power common mode choke, including annular magnetic core and a plurality of coil ring, coil ring one end opening, the size of opening is not less than annular magnetic core's thickness, and a plurality of coil ring end to end forms helical coil structure and encircles on annular magnetic core.

One or more embodiments provide a switching power supply employing a high power common mode choke as described above, disposed in a circuit of the switching power supply, for filtering common mode interference signals.

Compared with the prior art, the utility model has the beneficial effects that:

The winding coil is a coil ring of a single coil, the coil ring is placed on the annular magnetic core and sequentially connected end to form a spiral coil structure to encircle the annular magnetic core, the winding coil is not needed, the influence on the performance of the common mode choke coil obtained after winding due to the bending stress of the coil in the winding process is avoided, and the performance of the common mode choke coil and the qualification rate of finished products in the production process are improved.

The advantages of the present utility model, as well as those of additional aspects, will be described in detail in the following detailed examples.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

Fig. 1 is a schematic diagram of a two-phase high-power common mode choke coil according to embodiment 1 of the present utility model;

fig. 2 is a structural exploded view of a two-phase high-power common mode choke coil of embodiment 1 of the present utility model;

Fig. 3 is a schematic diagram of the structure of a four-phase high-power common mode choke coil of embodiment 1 of the present utility model;

Fig. 4 is a first structural schematic diagram of a coil loop 1-1 of embodiment 1 of the present utility model;

fig. 5 is a second structural schematic diagram of the coil loop 1-1 of embodiment 1 of the present utility model;

Fig. 6 is a schematic view of the first structure of the coil loop 1-1 of embodiment 1 of the present utility model after providing a spacer member;

FIG. 7 is a structural elevation view of the connecting sheet 1-3 of embodiment 1 of the present utility model;

FIG. 8 is a left side view showing the structure of the connecting piece 1-3 of embodiment 1 of the present utility model;

FIG. 9 is a top view showing the structure of the connecting pieces 1-3 of embodiment 1 of the present utility model;

Wherein, 1, spiral coil structure, 2, annular magnetic core, 3, insulating baffle, 4, bottom plate, 1-1, coil ring, 1-2, insulating sleeve, 1-3, connection piece.

Detailed Description

The utility model will be further described with reference to the drawings and examples.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

Example 1

In the technical scheme disclosed in one or more embodiments, as shown in fig. 1 to 9, a high-power common mode choke coil comprises a ring-shaped magnetic core 2 and a plurality of coil rings 1-1, wherein one end of each coil ring 1-1 is opened, the size of the opening is not smaller than the thickness of the ring-shaped magnetic core 2, and the plurality of coil rings 1-1 are connected end to form a spiral coil structure 1 to encircle the ring-shaped magnetic core 2.

The winding coil arranged in the embodiment is the coil ring 1-1 of a single coil, the coil ring 1-1 is placed on the annular magnetic core 2 and sequentially connected end to form the spiral coil structure 1 to encircle the annular magnetic core 2, the winding coil is not needed, the influence on the performance of the common mode choke coil obtained after winding due to the bending stress of the coil in the winding process is avoided, and the performance of the common mode choke coil and the qualification rate of finished products in the production process are improved.

In this embodiment, the toroidal core 2 is a closed inseparable core, i.e. an integral closed toroidal structure. Alternatively, the annular structure may be a triangular annular, square annular, circular annular or polygonal annular structure, and the cross section of the corresponding annular magnetic core 2 perpendicular to the intermediate shaft of the magnetic core may be triangular, quadrangular, circular or polygonal.

For the magnetic core, the magnetic cores are combined after being divided, the magnetic permeability of the obtained magnetic core is reduced, and the magnetic core in the embodiment is an annular magnetic core integrated in a closed mode, so that the magnetic permeability of the magnetic core can be ensured.

The size of the opening of the coil ring 1-1 is not smaller than the thickness of the annular magnetic core 2, so that the opening can be placed on the ring arm of the magnetic ring of the annular magnetic core 2.

Alternatively, the coil ring 1-1 may be a bare wire or a wire wrapped with an insulating layer after being bent;

Preferably, the coil ring 1-1 can be made of a bare copper wire with the diameter of 6mm by cutting and stamping;

It will be appreciated that the coil loops 1-1 forming the helical coil structure 1 are provided with isolation means therebetween such that a mechanical separation is formed between the individual coil loops 1-1, avoiding electrical shorting or even device failure. The isolation member setting area is an area a in the drawing;

Specifically, the isolation component may be an insulating sleeve 1-2 wrapped on the coil ring 1-1, or an insulating material;

alternatively, the insulating sleeve may be a fiberglass tube or a teflon sleeve;

In some embodiments, a plurality of coil loops 1-1 are connected end to end by providing connection tabs 1-3;

Specifically, as shown in fig. 7 to 9, the connecting piece 1-3 is a straight plate, the corresponding coil ring 1-1 can wrap the area of the three surface setting areas of the annular magnetic core 2, and the plurality of coil rings 1-1 are connected through the straight plate to form a spiral coil structure 1 so as to encircle the annular magnetic core 2;

In some embodiments, as shown in fig. 4, the coil ring 1-1 is in a U-like structure, two side walls of the opening of the coil ring 1-1 in the U-like structure are staggered by a set angle, and the staggered set angle enables the tail end of the previous coil ring 1-1 to be connected with the head end of the next coil ring 1-1 through the connecting sheet 1-3, so that spiral windings are formed by sequentially connecting.

In another implementation scheme, the coil rings 1-1 are of semicircular structures, the head end and the tail end of the coil rings 1-1 are staggered by a set angle, the two coil rings 1-1 form a circle, the tail end of the upper coil ring 1-1 is connected with the head end of the lower coil ring 1-1, and spiral windings are formed by sequentially connecting the tail ends of the upper coil ring 1-1;

In another implementation scheme, as shown in fig. 5, the coil ring 1-1 has an L-like structure, and the tail end of the previous coil ring 1-1 is connected with the head end of the next coil ring 1-1 to form a square coil, and the square coil is sequentially connected to form a spiral-like winding;

Alternatively, the connection mode of the coil ring 1-1 and the connecting sheet can be welding connection, and a metal welding method can be adopted, such as soldering, electric soldering iron soldering, resistance welding, ultrasonic welding, argon arc welding and the like.

The number of the spiral coil structures 1 is determined according to the number of phases of the high-power common mode choke coil, for example, two spiral coil structures 1 are arranged in the two-phase common mode choke coil, four spiral coil structures 1 are arranged in the four-phase common mode choke coil, and the spiral coil structures 1 are formed by connecting a plurality of coil rings 1-1.

According to a further technical scheme, an insulating partition plate 3 is arranged between the spiral coil structures 1 in the annular magnetic core 2, and is made of insulating materials;

Specifically, the two-phase common mode choke coil is a straight plate-shaped partition plate, and the partition plate of the four-phase common mode choke coil adopts a cross-shaped partition plate.

Alternatively, the toroidal core 2 may be a soft magnetic core, may be a metal soft magnetic core or ferrite, and preferably, a ferrite with high magnetic permeability may be used, or a nano amorphous material may be used.

Optionally, the annular magnetic core 2 is fixedly arranged on the bottom plate 4 after the spiral coil structure 1 is arranged on the annular magnetic core.

Example 2

Based on embodiment 1, this embodiment provides a switching power supply, which uses the high-power common mode choke coil described in embodiment 1, and is disposed in a circuit of the switching power supply to filter a common mode interference signal.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

While the foregoing description of the embodiments of the present utility model has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the utility model, but rather, it is intended to cover all modifications or variations within the scope of the utility model as defined by the claims of the present utility model.

Claims (10)

1. A high-power common mode choke coil is characterized by comprising an annular magnetic core and a plurality of coil rings, wherein one end of each coil ring is provided with an opening, the size of the opening is not smaller than the thickness of the annular magnetic core, and the plurality of coil rings are connected end to form a spiral coil structure to encircle the annular magnetic core.

2. A high power common mode choke as set forth in claim 1 wherein the coil loop is a bare wire or a wire wrapped with an insulating layer.

3. A high-power common mode choke as set forth in claim 1, wherein the coil loops forming the helical coil structure are provided with isolation members therebetween so that mechanical separation is formed between the respective coil loops.

4. A high power common mode choke as set forth in claim 3 wherein the isolation member is an insulating sleeve wrapped around the coil loop.

5. A high power common mode choke as set forth in claim 1, wherein the plurality of coil loops are connected end to end by means of connecting tabs;

The connecting sheet is a straight sheet, and the plurality of coil rings are connected through the straight sheet to form a spiral coil structure so as to encircle the annular magnetic core.

6. A high-power common mode choke coil according to claim 1, wherein the coil ring has a U-like structure, and both side walls of the opening of the coil ring of the U-like structure are offset by a set angle.

7. A high-power common mode choke coil according to claim 1, wherein the coil rings are of a semicircular structure, the head end and the tail end of each coil ring are staggered by a set angle, the two coil rings form a circle, the tail end of the upper coil ring is connected with the head end of the lower coil ring, and spiral windings are formed by sequentially connecting the tail ends of the upper coil ring with the head end of the lower coil ring.

8. A high power common mode choke coil as set forth in claim 1, wherein the coil loops are L-like in configuration, and the tail end of the last coil loop is connected to the head end of the next coil loop to form a square loop, which is in turn connected to form a spiral-like winding.

9. A high power common mode choke as set forth in claim 1, wherein the connection between the coil loops is a welded connection;

or an insulating partition plate is arranged between the spiral coil structures in the magnetic core;

Or the annular magnetic core adopts a soft magnetic core;

Or the annular magnetic core is of an integrated closed annular structure, and the annular structure is a triangular annular structure, a square annular structure, a circular annular structure or a polygonal annular structure.

10. A switching power supply is characterized in that the switching power supply adopts the high-power common mode choke coil according to any one of claims 1-9, and the high-power common mode choke coil is arranged in a circuit of the switching power supply and is used for filtering common mode interference signals.