Common mode choke device

Abstract

The utility model discloses a common mode choke device which comprises a metal shell, an insulating support and a magnetic ring. The metal shell is provided with an oblong hole, a containing groove is formed in the portion, outside the oblong hole, of the metal shell, the transverse section of the containing groove and the transverse section of the magnetic ring are in an annular runway shape, the magnetic ring and the insulation support are arranged in the containing groove, the insulation support is located between the magnetic ring and the metal shell, the magnetic ring and the metal shell are arranged in a spaced mode, and silica gel is filled in the containing groove. The common mode choke device has the advantages of excellent heat dissipation performance, high magnet ring vibration resistance level and small size.

Description

Technical Field

[0001] This utility model belongs to the field of common mode inductor technology, and specifically relates to a common mode inductor device. Background Technology

[0002] Against the backdrop of the rapid development of new energy vehicles, the iteration speed of new energy vehicle models is constantly accelerating, and the power performance is also continuously improving. These vehicles need to meet standards in terms of reliability, safety, and electromagnetic compatibility. The internal design of the controller also needs to meet increasingly higher voltage drive requirements, as higher drive voltages lead to stronger electromagnetic interference. To eliminate highly conducted electromagnetic interference, larger magnetic rings are needed to absorb it, which also increases the heat generated by the magnetic rings.

[0003] Currently, existing common-mode inductors use a plastic shell to encase the magnetic ring, resulting in poor heat dissipation performance. Furthermore, when the magnetic ring absorbs excessive electromagnetic interference, the high temperature generated by the magnetic ring can soften or even melt the plastic shell on the outside of the magnetic ring, seriously affecting the use of the controller. In particular, when the magnetic ring is nested with a copper busbar, the heat generated by the copper busbar will also be superimposed on the plastic shell on the outside of the magnetic ring, making it even hotter and more prone to aging. Utility Model Content

[0004] To address the aforementioned problems, this utility model discloses a common-mode inductor device to overcome or at least partially solve these problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model discloses a common mode inductor device, including a metal housing, an insulating support, and a magnetic ring;

[0007] The metal housing has an elongated hole, and a receiving groove is formed on the outer side of the elongated hole. The transverse cross-section of the receiving groove and the magnetic ring is an annular racetrack shape. The magnetic ring and the insulating support are both disposed in the receiving groove, and the insulating support is located between the magnetic ring and the metal housing, so that the magnetic ring and the metal housing are separated by a gap. The receiving groove is filled with silicone.

[0008] Furthermore, the insulating bracket includes a racetrack-shaped support portion and multiple U-shaped limiting portions;

[0009] Multiple limiting parts are evenly spaced on the support part, the bottom of the limiting part is fixedly connected to the upper end face of the support part, the support part is used to make the bottom of the magnetic ring and the bottom of the receiving groove have a gap, and the limiting part is used to make the side wall of the magnetic ring and the wall of the receiving groove have a gap.

[0010] Furthermore, the thickness of the support portion and the thickness of the limiting portion are 0.5mm to 1mm.

[0011] Furthermore, the insulating support is made of plastic.

[0012] Furthermore, the magnetic ring is a nanocrystalline magnetic core.

[0013] Furthermore, the metal casing is formed by die casting of aluminum alloy.

[0014] Furthermore, at least two fixing parts are formed on the outer periphery of the metal housing, and each fixing part has a fixing hole. The metal housing is fixed to the controller housing through the fixing hole and screws or bolts.

[0015] Furthermore, the outer side of the metal housing is covered with a thermal pad or thermal paste, and the thermal pad or thermal paste is located between the metal housing and the controller housing.

[0016] Furthermore, the metal housing is provided with a positioning post or positioning hole that mates with the positioning hole or positioning post on the controller housing.

[0017] Furthermore, the metal housing is provided with snap-fit ​​holes for securing snap-fit ​​devices on the wire harness.

[0018] The advantages and beneficial effects of this utility model are:

[0019] In the common-mode inductor of this invention, by setting an insulating support between the magnetic ring and the metal housing, the gap of the magnetic ring is placed inside the metal housing and fixed by potting glue, thereby enabling the common-mode inductor to have excellent heat dissipation performance, high magnetic ring vibration resistance level and small size. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0021] Figure 1 This is a three-dimensional structural view of the front of the common mode inductor device in one embodiment of the present invention;

[0022] Figure 2 This is a perspective view of the back of the common mode inductor in one embodiment of the present invention;

[0023] Figure 3 This is an exploded view of the common-mode inductor device in one embodiment of the present invention;

[0024] Figure 4 This is a perspective view of the insulating bracket in one embodiment of the present invention;

[0025] Figure 5 This is a three-dimensional structural diagram of the metal casing in one embodiment of the present invention.

[0026] In the figure: 1. Metal shell; 2. Insulating bracket; 2-1. Support part; 2-2. Limiting part; 3. Magnetic ring; 4. Silicone; 5. Oblong hole; 6. Receiving groove; 7. Fixing part; 8. Fixing hole; 9. Positioning post; 10. Snap-on hole. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0029] One embodiment of this utility model provides a common-mode inductor device, such as... Figures 1 to 5 As shown, the common-mode inductor device includes a metal housing 1, an insulating support 2, and a magnetic ring 3.

[0030] Specifically, the metal housing 1 has an elongated hole 5, which is used for the terminal block to pass through the common mode inductor. The size of the elongated hole 5 can be determined according to the size of the terminal block, so that when the terminal block is inserted into the elongated hole 5, the distance between the terminal block and the metal housing 1 is 1mm to 3mm. A receiving groove 6 is formed on the metal housing 1 outside the elongated hole 5. The transverse cross-section of the receiving groove 6 and the magnetic ring 3 is annular racetrack type, that is, the receiving groove 6 is fitted outside the elongated hole 5. The magnetic ring 3 and the insulating support 2 are both set in the receiving groove 6, and the insulating support 2 is located between the magnetic ring 3 and the metal housing 1, so that the magnetic ring 3 and the metal housing 1 are separated by a gap. The receiving groove 6 is filled with silicone 4.

[0031] In this way, during the assembly of the common-mode inductor, the insulating bracket 2 and the magnetic ring 3 are first placed in the receiving groove 6. The insulating bracket 2 supports the magnetic ring 3, creating a gap between it and the metal housing 1. Then, silicone 4 is poured into the receiving groove 6 to encapsulate the magnetic ring 3. The silicone 4 not only fixes the magnetic ring 3 and provides insulation between it and the metal housing 1, but also quickly conducts the heat generated by the magnetic ring 3 to the metal housing 1. Furthermore, since the outer shell of the magnetic ring 3 is made of metal, there is no issue of heat aging or melting due to overheating. The metal housing 1 also has better thermal conductivity, effectively dissipating the heat generated by the magnetic ring 3. In addition, the high strength of the metal housing 1 allows for a thinner shell, resulting in a smaller common-mode inductor and better utilization of the controller's internal space.

[0032] In summary, in the common-mode inductor device of this embodiment, by setting an insulating support between the magnetic ring and the metal housing, the gap of the magnetic ring is located inside the metal housing, and it is fixed by potting glue, thereby enabling the common-mode inductor device to have excellent heat dissipation performance, high magnetic ring vibration resistance level and small size.

[0033] In this embodiment, as Figure 4 As shown, the insulating bracket 2 includes a racetrack-shaped support part 2-1 and multiple U-shaped limiting parts 2-2.

[0034] Multiple limiting parts 2-2 are evenly spaced on the support part 2-1, and the limiting parts 2-2 are perpendicular to the edge of the support part 2-1. The bottom of the limiting parts 2-2 is fixedly connected to the upper end face of the support part 2-1. When the magnetic ring 3 is placed on the insulating bracket 2, the magnetic ring 3 is exactly located in the U-shape of the multiple limiting parts 2-2. The support part 2-1 is used to set a gap between the bottom of the magnetic ring 3 and the bottom of the receiving groove 6, and the limiting parts 2-2 are used to set a gap between the side wall of the magnetic ring 3 and the wall of the receiving groove 6.

[0035] The thickness of the support part and the thickness of the limiting part are 0.5mm to 1mm, so that the magnetic ring and the metal housing bracket form an assembly gap of 0.5mm to 1mm to provide space for potting.

[0036] In addition, the insulating bracket is made of plastic, which is easy to injection mold and has low cost. Using plastic to make the insulating bracket can reduce the production cost of common mode inductors.

[0037] In this embodiment, the magnetic ring is a nanocrystalline magnetic core. Using a nanocrystalline magnetic core as the magnetic ring can significantly improve the EMC (Electromagnetic Compatibility) performance of high-voltage devices, and make the common-mode inductor smaller in size while achieving the same power.

[0038] Furthermore, the metal housing is die-cast from aluminum alloy, which makes the common mode inductor lighter while ensuring the structural strength of the housing.

[0039] In this embodiment, as Figure 2 and Figure 5 As shown, at least two fixing parts 7 are formed on the outer periphery of the metal housing 1, and each fixing part 7 has a fixing hole 8. The metal housing 1 is fixed to the controller housing through the fixing holes 8 and screws or bolts. Furthermore, the metal housing 1 is provided with a positioning post 9 that mates with a positioning hole on the controller housing. The positioning hole and the positioning post 9 are used to achieve the positioning and assembly of the metal housing 1 and the controller housing. The positions of the positioning hole and the positioning post can be interchanged, which is also within the protection scope of this utility model.

[0040] In addition, the outer side of the metal housing is covered with a thermal pad or thermal paste, which is located between the metal housing and the controller housing. In this way, the thermal pad or thermal paste can quickly conduct heat from the metal housing to the controller housing, resulting in a lower temperature for the common mode inductor.

[0041] Furthermore, such as Figure 1 As shown, the metal housing is provided with a snap-fit ​​hole 10, which is used to fix the snap-fit ​​on the wire harness so that the wire harness can be fixed relative to the metal housing.

[0042] The above description is merely a specific embodiment of this utility model. Under the teachings of this utility model, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of this utility model, and the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A common-mode inductor device, characterized in that, Includes a metal casing, an insulating support, and a magnetic ring; The metal housing has an elongated hole, and a receiving groove is formed on the outer side of the elongated hole. The transverse cross-section of the receiving groove and the magnetic ring is an annular racetrack shape. The magnetic ring and the insulating support are both disposed in the receiving groove, and the insulating support is located between the magnetic ring and the metal housing, so that the magnetic ring and the metal housing are separated by a gap. The receiving groove is filled with silicone.

2. The common-mode inductor device according to claim 1, characterized in that, The insulating support includes a racetrack-shaped support portion and multiple U-shaped limiting portions; Multiple limiting parts are evenly spaced on the support part, the bottom of the limiting part is fixedly connected to the upper end face of the support part, the support part is used to make the bottom of the magnetic ring and the bottom of the receiving groove have a gap, and the limiting part is used to make the side wall of the magnetic ring and the wall of the receiving groove have a gap.

3. The common-mode inductor device according to claim 2, characterized in that, The thickness of the support portion and the thickness of the limiting portion are 0.5mm to 1mm.

4. The common-mode inductor device according to claim 1, characterized in that, The insulating bracket is made of plastic.

5. The common-mode inductor device according to claim 1, characterized in that, The magnetic ring is a nanocrystalline magnetic core.

6. The common-mode inductor device according to claim 1, characterized in that, The metal casing is formed by die casting of aluminum alloy.

7. The common-mode inductor device according to claim 1, characterized in that, At least two fixing parts are formed on the outer periphery of the metal housing, and each fixing part has a fixing hole. The metal housing is fixed to the controller housing through the fixing hole and screws or bolts.

8. The common-mode inductor device according to claim 7, characterized in that, The outer side of the metal housing is covered with a thermal pad or thermal paste, and the thermal pad or thermal paste is located between the metal housing and the controller housing.

9. The common-mode inductor device according to claim 7, characterized in that, The metal housing is provided with positioning pins or positioning holes that cooperate with positioning holes or positioning pins on the controller housing.

10. The common-mode inductor device according to any one of claims 1 to 9, characterized in that, The metal housing is provided with snap-fit ​​holes, which are used to fix the snap-fit ​​on the wire harness.

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