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EP-4736203-A1 - MAGNETIC COMPONENT WITH SHIELDING

EP4736203A1EP 4736203 A1EP4736203 A1EP 4736203A1EP-4736203-A1

Abstract

A magnetic component with shielding comprises: a magnetic component (1) including a body and a plurality of pin portions (11); and an electrically conductive coating (3) disposed on a surface of the magnetic component (1), wherein the electrically conductive coating (3) is insulated from each of the pin portions (11). In the invention, the electrically conductive coating (3) covers an outer surface of the magnetic component (1) as a shield, such that the shield completely encloses the outer surface of the magnetic component (1) without leaving any gaps. The magnetic component with shielding according to the invention offers manufacturing advantages over the conventional art in which a housing must be provided to serve as a shield.

Inventors

  • CHING, Tan Lung

Assignees

  • Würth Elektronik Eisos Gmbh & CO. KG

Dates

Publication Date
20260506
Application Date
20240627

Claims (13)

  1. 1. A magnetic component with shielding, comprising: a magnetic component (1) including a body (13) and a plurality of pin portions (11); and an electrically conductive coating (3) disposed on a surface of the magnetic component (1), the electrically conductive coating (3) being insulated from each of the pin portions (11).
  2. 2. The magnetic component with shielding of claim 1, further comprising an insulating coating (2) between the body (13) and the electrically conductive coating (3).
  3. 3. The magnetic component with shielding of claim 1 or 2, further comprising at least one ground lug (12) on the body (13), the at least one ground lug (12) being electrically connected with the electrically conductive coating (3).
  4. 4. The magnetic component with shielding of at least one of claims 1 to 3, further comprising a protective coating (4) outside of the electrically conductive coating (3).
  5. 5. The magnetic component with shielding of claim 4, wherein the protective coating (4) includes an opening in at least one predetermined position, and at least one ground electrode (31) is provided on the electrically conductive coating (3) at a location corresponding to the opening.
  6. 6. The magnetic component with shielding of claim 5, wherein the at least one ground electrode (31) is electroplated.
  7. 7. The magnetic component with shielding of at least one of claims 1 to 6, wherein the electrically conductive coating (3) forms a complete seamless shield.
  8. 8. The magnetic component with shielding of at least one of claims 1 to 7, wherein the electrically conductive coating (3) is formed by spraying and coating a metal-based electrically conductive material.
  9. 9. The magnetic component with shielding of at least one of claims 1 to 8, wherein the electrically conductive coating (3) comprises at least one of silver particles, copper particles and silver-plated copper particles.
  10. 10. The magnetic component with shielding of at least one of claims 3 to 9, wherein the electrically conductive coating (3) completely encloses the magnetic component (1) and the at least one ground lug (12) is positioned on a surface of the magnetic component (1) that is exactly closest to a grounding point.
  11. 11. The magnetic component with shielding of at least one of claims 1 to 10, wherein the body (13) is a cuboid and all six sides of the body (13) are coated with the electrically conductive coating (3).
  12. 12. The magnetic component with shielding of at least one of claims 1 to 11, wherein the magnetic component (1) includes at least one of an inductor and a transformer.
  13. 13. Method of manufacturing a magnetic component with shielding, comprising the steps: providing a magnetic component (1) including a body (13) and a plurality of pin portions (11); and disposing an electrically conductive coating (3) on a surface of the magnetic component (1), wherein the electrically conductive coating (3) is insulated from each of the pin portions (11).

Description

Magnetic Component with Shielding Technical Field The invention relates to a magnetic component, particularly to a magnetic component with an electrically conductive coating on an outer surface thereof. Background In this area of technology, there is a trend towards miniaturization of various electronic devices, and maximization of power density in circuit boards, as well as reducing the spacing among electronic components on circuit boards. Many of these components, including magnetic components such as inductors and transformers, and the like, operate based on the principles of magnetism. Such magnetic components may emit magnetic fields, generating electromagnetic interference that may affect the functioning of nearby components. In applications requiring high stability, such as automotive electronics, it is essential to carefully manage the effects of electromagnetic interference. In view of the foregoing, an inductor with shielding has been developed. For example, Taiwanese Patent under Publication No. TWI734771 discloses an inductor that includes a housing acting as a shield over an inductor body. However, due to the material properties of the molded inductor itself, the outer dimensions of the molded inductor are prone to slight tolerances. In this case, if the inductor body is to be combined with a preformed housing, a gap may occur therebetween and no close contact can be achieved. Moreover, if an excessive pressure is applied in order to clamp the housing and the inductor body during combination, the inductor body may be damaged. Furthermore, processing the housing into a complex shape that perfectly fits the inductor body is challenging. In the prior art, a gap is usually left at the comer to facilitate the bending process, as shown in the representative drawing (FIG. 4) of the above-mentioned prior patent. Therefore, there is a need for further improvement in respect of coverage and the connection between the shield and the inductor body in a fit manner. In view of this, the inventor, having many years of research and practical experience in related fields, has designed a magnetic component with shielding to overcome the drawbacks of the above-mentioned conventional techniques. Content The main purpose of the invention is to provide a magnetic component with an improved shielding. To this end, a magnetic component with shielding according to the invention comprises: a magnetic component including a body and a plurality of pin portions; and an electrically conductive coating disposed on a surface of the magnetic component, wherein the electrically conductive coating is insulated from each of the pin portions. The electrically conductive coating may be formed by spraying and coating a metal-based electrically conductive material, such as a metal-based electrically conductive material containing silver particles, copper particles, or silver-plated copper particles. The electrically conductive coating disposed on the outer surface of the magnetic component serves as an entire and well-fitted shield. The electrically conductive coating on the outer surface of the magnetic component can form a complete seamless shield, thereby minimizing the likelihood of magnetic field leakage. Furthermore, the shielding effect can be enhanced by increasing the thickness of the electrically conductive coating to meet the requirements of various applications. The magnetic component includes at least one of an inductor and a transformer, which is encased by the body and electrically connected to the plurality of pin portions. If the surface of the magnetic component is not suitable for direct contact with the electrically conductive coating that has electrical conductivity, an insulating coating may be interposed between the body and the electrically conductive coating. Furthermore, if a ground terminal is present on the surface of the magnetic component, it is necessary to ensure that the insulating coating does not cover the ground terminal. Since the shield must be grounded, if the surface of the magnetic component does not have a ground terminal, a ground lug can be provided on the body. The ground lug is electrically connected to the electrically conductive coating. Given that the electrically conductive coating can completely enclose the magnetic component, the ground lug may be positioned on the surface that is exactly closest to grounding point. Unlike conventional techniques, the ground lug does not need to extend from a top surface all the way down. If both the insulating coating and the ground lug are to be provided, the insulating coating may be provided first, followed by the ground lug, since the ground lug does not serve for electrically conducting with the body. Alternatively, the ground lug may be provided first, followed by covering with a mask and applying an insulating coating. Once the insulating coating is applied, the mask on the ground lug can be removed. To prevent oxidation of the electr