High-power common mode choke and switching power supply

Abstract

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

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic devices, in particular to a high-power common-mode choke and a switching power supply. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Common mode inductors (CMC), also called common mode chokes, are often used in switching power supplies to filter common mode electromagnetic interference signals. In circuits, common mode inductors also play the role of EMI filtering, used to suppress common mode noise generated by the line and prevent high-frequency signals from radiating outward. The power of magnetic components is mainly determined by the product of the effective area of ​​the magnetic circuit of the magnet and the window area (the area of ​​the conductor). In a limited volume, increasing the conductor area of ​​the common mode choke can improve the current carrying capacity, making it suitable for high-power power supply EIM circuit filtering.

[0004] The inventor found in the research that, due to the decrease in the magnetic permeability of the combined magnetic core after the magnetic core is split, most of the existing high-power common-mode inductors generally use an integrated ring-shaped magnetic core, specifically a ring-shaped magnetic core plus a flat wire solution; the coil is wound with a flat wire, and the flat wire conductor is flat, which requires the inner hole of the magnetic core to be large enough, and the width of the wire is increased outward after the winding of the common-mode inductor, so as to increase the length of the device in the horizontal and vertical directions. If a round wire is selected for winding, when the wire diameter is not less than 4mm, a large pulling force is required to wind it on the ring-shaped magnetic core. The common-mode inductor uses a ferrite high-permeability ring-shaped magnetic core. The ring-shaped magnetic core will be subjected to huge stress during the winding process. If there is no shell protection, the magnetic permeability will drop rapidly, the inductance will drop, and the impedance of the common-mode inductor will drop, thereby reducing the impedance and weakening its filtering effect. However, adding a shell will increase the volume. Utility Model Content

[0005] In order to solve the above problems, the utility model proposes a high-power common-mode choke and a switching power supply, divides the coil into coil rings, realizes the spiral coil setting by assembling metal parts, and solves the winding problem of the high-power common-mode choke.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] One or more embodiments provide a high-power common-mode choke, including an annular magnetic core and multiple coil rings, one end of the coil ring is open, the size of the opening is not less than the thickness of the annular magnetic core, and the multiple coil rings are connected end to end to form a spiral coil structure surrounding the annular magnetic core.

[0008] One or more embodiments provide a switching power supply, wherein the switching power supply adopts the above-mentioned high-power common-mode choke, which is arranged in the circuit of the switching power supply to filter common-mode interference signals.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The winding coil arranged in the utility model is a single-turn coil ring, which is placed on the annular magnetic core and connected end to end in sequence to form a spiral coil structure that wraps around the annular magnetic core. The coil does not need to be wound, which avoids the effect of the bending stress of the coil on the annular magnetic core during the winding process, thereby affecting the performance of the common-mode choke obtained after winding, thereby improving the performance of the common-mode choke and the qualified rate of finished products in the production process.

[0011] The advantages of the present invention and additional advantages will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute a limitation on the present invention.

[0013] Figure 1 This is a schematic diagram of the structure of a two-phase high-power common-mode choke coil of Embodiment 1 of the present utility model;

[0014] Figure 2 This is a structural exploded diagram of a two-phase high-power common-mode choke coil of Embodiment 1 of the utility model;

[0015] Figure 3 It is a structural schematic diagram of a four-phase high-power common-mode choke coil of Embodiment 1 of the present utility model;

[0016] Figure 4 This is a first structural schematic diagram of the coil ring 1-1 of Example 1 of the utility model;

[0017] Figure 5 This is a second structural schematic diagram of the coil ring 1-1 of Embodiment 1 of the utility model;

[0018] Figure 6 This is a schematic diagram of the first structure of the coil ring 1-1 of Example 1 of the utility model after the isolation component is provided;

[0019] Figure 7 This is a structural front view of the connecting piece 1-3 of Example 1 of the utility model;

[0020] Figure 8 This is a left side view of the structure of the connecting piece 1-3 of Example 1 of the utility model;

[0021] Fig. 9 This is a top view of the structure of the connecting piece 1-3 of Example 1 of the utility model;

[0022] Wherein: 1. spiral coil structure, 2. annular magnetic core, 3. insulating partition, 4. bottom plate, 1-1. coil ring, 1-2. insulating sleeve, 1-3. connecting piece. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are exemplary and are intended to provide further description of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Example 1

[0027] In the technical solutions disclosed in one or more embodiments, Figures 1 to 9 As shown, a high-power common-mode choke includes a ring-shaped magnetic core 2 and multiple coil rings 1-1. One end of the coil ring 1-1 is open, and the size of the opening is not less than the thickness of the ring-shaped magnetic core 2. Multiple coil rings 1-1 are connected end to end to form a spiral coil structure 1 that surrounds the ring-shaped magnetic core 2.

[0028] The winding coil provided in the present embodiment is a single-turn coil ring 1-1, which is placed on the annular magnetic core 2 and connected end to end in sequence to form a spiral coil structure 1 wrapped around the annular magnetic core 2. There is no need to wind the coil, which avoids the bending stress of the coil acting on the annular magnetic core during the winding process, thereby affecting the performance of the common-mode choke obtained after winding, thereby improving the performance of the common-mode choke and the qualified rate of finished products in the production process.

[0029] In this embodiment, the annular magnetic core 2 is a closed indivisible magnetic core, that is, an integrated closed annular structure. Optionally, the annular structure can be a triangular annular structure, a square annular structure, a circular annular structure or a polygonal annular structure, and the corresponding cross section of the annular magnetic core 2 perpendicular to the middle axis of the magnetic core can be a triangle, a quadrilateral, a circular ring or a polygon.

[0030] For the magnetic core, after being divided and then reassembled, the magnetic permeability of the obtained magnetic core decreases. The magnetic core in this embodiment is a closed and integrated annular magnetic core, which can ensure the magnetic permeability of the magnetic core.

[0031] The size of the opening of the coil ring 1 - 1 is not less than the thickness of the annular magnetic core 2 , so that the coil ring 1 - 1 can be placed on the ring arm of the magnetic ring of the annular magnetic core 2 through the opening.

[0032] Optionally, the coil ring 1 - 1 may be a bare wire or a wire wrapped with an insulating layer and bent;

[0033] Preferably, the coil ring 1-1 can be made of bare copper wire with a diameter of 6 mm, and is prepared by cutting and stamping;

[0034] It can be understood that isolation components are provided between the coil rings 1-1 forming the spiral coil structure 1, so that each coil ring 1-1 is mechanically separated to avoid electrical short circuit or even device failure. The area where the isolation components are provided is area A in the figure;

[0035] Specifically, the isolation component may be an insulating sleeve 1 - 2 wrapped around the coil ring 1 - 1 , or a wrapped insulating material;

[0036] Optionally, the insulating sleeve may be a fiberglass tube or a Teflon tube;

[0037] In some embodiments, a plurality of coil rings 1 - 1 are connected end to end by providing a connecting piece 1 - 3 ;

[0038] Specifically, Figures 7 to 9 As shown, the connecting piece 1-3 is a straight plate piece, and the corresponding coil ring 1-1 can wrap the area of ​​the set area of ​​the three surfaces of the annular magnetic core 2. After a plurality of coil rings 1-1 are connected by the straight plate pieces, a spiral coil structure 1 is formed to wrap around the annular magnetic core 2;

[0039] In some embodiments, Figure 4 As shown, the coil ring 1-1 is a U-shaped structure, and the two side walls of the opening of the U-shaped coil ring 1-1 are staggered at a set angle; the staggered set angle allows the tail end of the previous coil ring 1-1 to be connected to the head end of the next coil ring 1-1 through the connecting piece 1-3, and thus they are connected in sequence to form a spiral winding.

[0040] Another possible solution is that the coil ring 1-1 is a semicircular structure, the head and tail ends of the coil ring 1-1 are staggered at a set angle, the two coil rings 1-1 form a circle, the tail end of the previous coil ring 1-1 is connected to the head end of the next coil ring 1-1, and they are connected in sequence to form a spiral winding;

[0041] Another possible solution is Figure 5As shown, the coil ring 1-1 is an L-shaped structure, the tail end of the previous coil ring 1-1 is connected to the head end of the next coil ring 1-1, forming a circle of square, which are connected in sequence to form a spiral winding;

[0042] Optionally, the coil ring 1 - 1 and the connecting piece may be connected by welding; metal welding methods may be used, such as soldering, electric iron soldering, resistance welding, ultrasonic welding, argon arc welding, etc.

[0043] The number of spiral coil structures 1 to be set is determined according to the number of phases of the high-power common mode choke, such as two spiral coil structures 1 are set for a two-phase common mode choke, and four spiral coil structures 1 are set for a four-phase common mode choke; the spiral coil structure 1 is formed by connecting multiple coil rings 1-1.

[0044] A further technical solution is to provide an insulating partition 3 between the spiral coil structures 1 in the annular magnetic core 2, which is made of insulating material;

[0045] Specifically, the two-phase common mode choke is a straight plate-shaped partition, and the partition of the four-phase common mode choke is a cross-shaped partition.

[0046] Optionally, the annular magnetic core 2 may be a soft magnetic core, which may be a metal soft magnetic core or a ferrite, etc. Preferably, a high magnetic permeability ferrite is used, and a nano-amorphous material may also be used.

[0047] Optionally, the spiral coil structure 1 is arranged on the annular magnetic core 2 and then fixedly arranged on the bottom plate 4 .

[0048] Example 2

[0049] Based on Example 1, this example provides a switching power supply, which adopts a high-power common-mode choke described in Example 1 and is arranged in a circuit of the switching power supply to filter common-mode interference signals.

[0050] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0051] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A high-power common-mode choke, characterized in that: It includes an annular magnetic core and multiple coil rings. One end of the coil ring is open, and the size of the opening is not less than the thickness of the annular magnetic core. The multiple coil rings are connected end to end to form a spiral coil structure surrounding the annular magnetic core.

2. A high-power common-mode choke coil as claimed in claim 1, characterized in that: The coil ring is a bare wire or a wire wrapped with an insulation layer.

3. A high-power common-mode choke coil as claimed in claim 1, characterized in that: Isolation components are provided between the coil loops forming the spiral coil structure, so that mechanical separation is formed between the coil loops.

4. A high-power common-mode choke coil as claimed in claim 3, characterized in that: The isolation component is an insulating sleeve wrapped around the coil ring.

5. A high-power common-mode choke coil as claimed in claim 1, characterized in that: A plurality of coil rings are connected end to end by providing connecting pieces; The connecting piece is a straight plate piece, and a plurality of coil rings are connected through the straight plate piece to form a spiral coil structure to surround the annular magnetic core.

6. A high-power common-mode choke coil as claimed in claim 1, characterized in that: The coil ring is a U-shaped structure, and two side walls of the opening of the coil ring of the U-shaped structure are staggered at a set angle.

7. A high-power common-mode choke coil as claimed in claim 1, characterized in that: The coil ring is a semicircular structure, the head and tail ends of the coil ring are staggered at a set angle, the two coil rings form a circle, the tail end of the previous coil ring is connected to the head end of the next coil ring, and they are connected in sequence to form a spiral winding.

8. A high-power common-mode choke coil as claimed in claim 1, characterized in that: The coil ring is an L-shaped structure, with the tail end of the previous coil ring connected to the head end of the next coil ring to form a circle in a square shape, which are connected in sequence to form a spiral winding.

9. A high-power common-mode choke coil as claimed in claim 1, characterized in that: The connection between the coil rings is made by welding; Alternatively, an insulating partition is provided between the spiral coil structures in the magnetic core; Alternatively, the annular core adopts a soft magnetic core; Alternatively, the annular magnetic core is 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, characterized in that: The switching power supply adopts a high-power common-mode choke as described in any one of claims 1 to 9, which is arranged in the circuit of the switching power supply to filter common-mode interference signals.

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