Patent Application
20240029943
This application claims the benefit of and priority to Chinese Patent Application Number 202210876191.2 filed Jul. 25, 2022. The entire disclosure of this Chinese patent application is incorporated herein by reference.
The present disclosure relates to inductive elements, and more particularly to an electromagnetic interference (EMI) magnetic bead inductor.
This section provides background information related to the present disclosure which is not necessarily prior art.
The electromagnetic interference (EMI) magnetic bead inductor is a most common element in electronic devices and an important component in circuits. The EMI magnetic bead inductor is formed by winding a coil on a magnetizer. At present, the widely used EMI magnetic bead inductor with a single-turn design is of low cost and easy to be assembled, but it is difficult to achieve a higher impedance in a frequency band of dozens of megahertz, resulting in a poor electromagnetic interference suppression performance in this frequency band. In order to increase the impedance, a multi-turn coil is mounted in a magnetic core so as to dispose the magnetic core as a split structure, and after the coil is assembled, two split magnets are assembled as a whole, but due to an assembly gap therebetween, the electromagnetic interference suppression performance of the EMI magnetic bead inductor is seriously reduced.
This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
In exemplary embodiments, an EMI magnetic bead inductor comprises a magnetic core and at least one metal pin group. The metal pin group includes at least one first metal pin. The first metal pin has two first inserting portions and one first connecting portion. First ends of the two first inserting portions are connected by the first connecting portion. The magnetic core is provided with a plurality of insertion holes. Second ends of the two first inserting portions are inserted into two said insertion holes from first ends of the two said insertion holes and protrude from second ends of the two said insertion holes.
Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
The drawings in the present disclosure are provided for illustration of selected examples only, rather than all possible embodiments, and are not intended to limit the scope of the present disclosure.
Example embodiments will now be described more fully with reference to the accompanying drawings.
The present disclosure provides exemplary embodiments of EMI magnetic bead inductors so as to solve the technical problem that it is difficult for the EMI magnetic bead inductor at present to achieve a high impedance in a low frequency band.
In exemplary embodiments, an EMI magnetic bead inductor comprises a magnetic core and at least one metal pin group. The metal pin group includes at least one first metal pin. The first metal pin has two first inserting portions and one first connecting portion. First ends of the two first inserting portions are connected by the first connecting portion. The magnetic core is provided with a plurality of insertion holes. Second ends of the two first inserting portions are inserted into two said insertion holes from first ends of the two said insertion holes and protrude from second ends of the two said insertion holes.
In an exemplary embodiment of the present disclosure, the metal pin group further includes at least one second metal pin. The second metal pin has one second inserting portion and one second connecting portion. A first end of the second inserting portion is inserted into one said insertion hole from a second end of the one said insertion hole and protrudes from a first end of the one said insertion hole. A second end of the second inserting portion is connected to a first end of the second connecting portion. A second end of the second connecting portion is connected to a second end of the first inserting portion. And the metal pin group is wound around the magnetic core in a shape of coil.
In an exemplary embodiment of the present disclosure, the metal pin group includes two said second metal pins. The two said second metal pins are located at two sides of the first metal pin. The second ends of the two said second connecting portions are respectively connected to two second ends of two said first inserting portions.
In an exemplary embodiment of the present disclosure, the second end of the first inserting portion is provided with a first welding leg. The second end of the second connecting portion is provided with a second welding leg. The first welding leg and the second welding leg abut against each other and are connected by welding.
In an exemplary embodiment of the present disclosure, the magnetic core is provided with at least one first limiting groove and at least one second limiting groove. One said first limiting groove is communicated with the first ends of two said insertion holes. The first connecting portion is disposed in the first limiting groove. One said second limiting groove is communicated with the second end of another said insertion hole. The second connecting portion is disposed in the second limiting groove.
In an exemplary embodiment of the present disclosure, the metal pin group includes at least two said first metal pins. The second end of one said first inserting portion of one said first metal pin is connected to the second end of one said first inserting portion of another said first metal pin. The metal pin group is wound around the magnetic core in a shape of coil.
In an exemplary embodiment of the present disclosure, the second end of one of the first inserting portions of one said first metal pins and the second end of one of the first inserting portions of another said first metal pins are bent toward and lapped in a row and connected by welding.
In an exemplary embodiment of the present disclosure, the magnetic core is provided with at least one third limiting groove. The third limiting groove is communicated with two said insertion holes. The second ends, connected by welding, of two said first inserting portions of two said first metal pins are placed side by side in the third limiting groove.
In an exemplary embodiment of the present disclosure, the EMI magnetic bead inductor comprises two metal pin groups.
In an exemplary embodiment of the present disclosure, the metal pin group includes one said first metal pin and one third metal pin. The third metal pin has two third inserting portions and one third connecting portion. First ends of the two third inserting portions are connected by the third connecting portion. Second ends of the two third inserting portions are inserted into two said insertion holes from the second ends of the two said insertion holes and protrude from the first ends of the two said insertion holes. The first connecting portion is arranged between the two third inserting portions of the third metal pin at an interval. The second ends of both of the two third inserting portions are capable of bending towards and abutting against the mounting surface of the magnetic core with avoiding the first connecting portion. The third connecting portion is arranged between the two first inserting portions of the first metal pin at an interval. The second ends of both of the two first inserting portions are capable of bending towards and abutting against the mounting surface of the magnetic core with avoiding the third connecting portion.
Exemplary embodiments of the present disclosed may be configured to have one or more of the following characteristics and advantages. In exemplary embodiments of the EMI magnetic bead inductor, the two first inserting portions of the first metal pin are directly inserted into the insertion holes on the magnetic core and wound on the magnetic core in cooperation with the first connecting portion, so that the assembly is easy, the magnetism of the magnetic core can be fully utilized, and the length wound on the magnetic core is also increased, thereby improving the anti-interference performance of the EMI magnetic bead inductor in a frequency band of dozens of megahertz.
In exemplary embodiments of the EMI magnetic bead inductor, at least one first inserting portion of the first metal pin is connected to the second inserting portion of at least one second metal pin, so that the metal pin group is wound on the magnetic core in a shape of coil, which further increases the winding length of the metal pin group on the magnetic core. In addition, both the first metal pin and the second metal pin can be directly inserted into the magnetic core, without needing to arrange the magnetic core as a split structure, thus avoiding the affection of the assembly gap of the magnetic core on the performance of the EMI magnetic bead inductor, and further improving the anti-interference performance of the EMI magnetic bead inductor in a frequency band of dozens of megahertz.
In exemplary embodiments of the EMI magnetic bead inductor, the first inserting portions of the at least two first metal pins are connected, so that the metal pin group is wound on the magnetic core in a shape of coil, which further increases the winding length of the metal pin group on the magnetic core. In addition, the at least two first metal pins are both directly inserted into the magnetic core, without needing to arrange the magnetic core as a split structure, thus avoiding the affection of the assembly gap of the magnetic core on the performance of the EMI magnetic bead inductor, and further improving the anti-interference performance of the EMI magnetic bead inductor in a frequency band of dozens of megahertz.
In exemplary embodiments of the EMI magnetic bead inductor, the one first metal pin and the one third metal pin are inserted from two ends of the magnetic core, respectively, so that the magnetism of the magnetic core can be fully utilized, and the two first inserting portions of the first metal pin and the two third inserting portions of the third metal pin can be bent and extended longer, thereby increasing the lengths of the first metal pin and the third metal pin which are wound on the magnetic core, respectively, and improving the anti-interference performance of the EMI magnetic bead inductor in a frequency band of tens of megahertz.
With reference to the figures,
In exemplary embodiments of the EMI magnetic bead inductor, the two first inserting portions of the first metal pin are directly inserted into the insertion holes on the magnetic core and wound on the magnetic core in cooperation with the first connecting portion. Accordingly, the assembly is relatively non-complicated, the magnetism of the magnetic core can be fully utilized, and the length wound on the magnetic core is increased, thereby improving the anti-interference performance of the EMI magnetic bead inductor in a frequency band of dozens of megahertz.
In an exemplary embodiment, the first metal pin is generally U-shaped. The magnetic core has a cuboid structure. The insertion hole passes through a first side surface and a second side surface of the magnetic core which are opposite to each other. The first end of the insertion hole is located on the first side surface. The second end of the insertion hole is located on the second side surface. The first inserting portion is inserted into the first side surface of the magnetic core and protrudes from the second side surface thereof. The magnetic core has a winding region around which the plurality of insertion holes are distributed, so that the two first inserting portions of the first metal insertion pin can pass through the two insertion holes and be wound on the winding region.
In the first exemplary embodiment as illustrated in
In exemplary embodiments of the EMI magnetic bead inductor, at least one first inserting portion 2112 of the first metal pin 211 is connected to the second inserting portion 2122 of at least one second metal pin 212, so that the metal pin group 21 is disposed (e.g., wound, coiled, etc.) on the magnetic core 11 in a shape of coil, which further increases the winding length of the metal pin group 21 on the magnetic core 11. In addition, both the first metal pin 211 and the second metal pin 212 can be directly inserted into the magnetic core 11, without needing to arrange the magnetic core 11 as a split structure, thus avoiding the affection of the assembly gap of the magnetic core 11 on the performance of the EMI magnetic bead inductor, and further improving the anti-interference performance of the EMI magnetic bead inductor in a frequency band of dozens of megahertz. Compared with a conventional EMI magnetic bead inductor of the same type, the impedance of the EMI magnetic bead inductor of the present disclosure is significantly increased in the frequency band of dozens of megahertz. As illustrated in
In exemplary embodiments of the EMI magnetic bead inductor, a winding region 116 on the magnetic core 11 generally has a cuboid structure. The plurality of insertion holes 111 are arranged in two rows at intervals along a length direction X of the winding region 116. The second metal pin 212 generally has an L-shaped structure. The first connecting portion 2111 is arranged on one side of the magnetic core 11 along a width direction Y of the winding region 116, and the second connecting portion 2121 is arranged on the opposite side of the magnetic core 11 along the width direction Y of the winding region 116. The second inserting portion 2122 of the second metal pin 212 and the first inserting portion 2112 of the first metal pin 211 connected thereto are located on the opposite sides of the winding region 116, respectively, so that the metal pin group 21 is disposed (e.g., wound, coiled, etc.) around the magnetic core 11 in a shape of coil.
In the first exemplary embodiment as illustrated in
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In the first embodiment as illustrated in
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In exemplary embodiments of the EMI magnetic bead inductor, the first inserting portions 2212′ of the at least two first metal pins 221 are connected, so that the metal pin group 22 is disposed (e.g., wound, coiled, etc.) on the magnetic core 12 in a shape of coil, which further increases the winding length of the metal pin group 22 on the magnetic core 12. In addition, the at least two first metal pins 221 are both directly inserted into the magnetic core 12, without needing to arrange the magnetic core 12 as a split structure, thus avoiding the affection of the assembly gap of the magnetic core 12 on the performance of the EMI magnetic bead inductor, and further improving the anti-interference performance of the EMI magnetic bead inductor in a frequency band of dozens of megahertz. Compared with a conventional EMI magnetic bead inductor of the same type, the impedance of the EMI magnetic bead inductor of the present disclosure is significantly increased in the frequency band of dozens of megahertz. As illustrated in
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In the second embodiment as illustrated in
In the third embodiment as illustrated in
In exemplary embodiments of the EMI magnetic bead inductor, the first metal pin 231 and the third metal pin 232 are inserted from two ends of the magnetic core 13, respectively, so that the magnetism of the magnetic core 13 can be fully utilized, and the two first inserting portions 2312 of the first metal pin 231 and the two third inserting portions 2322 of the third metal pin 232 can be bent and extended longer towards the mounting surface 134 of the magnetic core 13, thereby increasing the lengths of the first metal pin 231 and the third metal pin 232 which are disposed (e.g., wound, coiled, etc.) on the magnetic core 13, respectively, and improving the anti-interference performance of the EMI magnetic bead inductor in a frequency band of tens of megahertz. Compared with a conventional EMI magnetic bead inductor of the same type, the impedance of the EMI magnetic bead inductor of the present disclosure is increased in the frequency band of dozens of megahertz. As illustrated in
In exemplary embodiments of the EMI magnetic bead inductor, the third metal pin 232 has a generally U-shaped structure. The first metal pin 231 and the third metal pin 232 have the same structure, but the insertion directions thereof are different. The third inserting portion 2322 is inserted from the second side surface 133 of the magnetic core 13 and protrudes from the first side surface 132, while the first inserting portion 2312 is inserted from the first side surface 132 of the magnetic core 13 and protrudes from the second side surface 133. By inserting the first metal pin 231 and the third metal pin 232 with the U-shaped structures into the magnetic core 13 in a staggered manner, the second ends of the two first inserting portions 2312 of the first metal pin 231 and the two third inserting portions 2322 of the third metal pin 232 are capable of bending towards and abutting against the mounting surface 134 of the magnetic core 13, so that the first metal pin 231 and the third metal pin 232 form a coil structure with 1.5 turns, and the winding region 135 becomes larger to better utilize the magnetism of the magnetic core 13. The magnetic core 13 is provided with two insertion holes 131 and two insertion holes 131′, all of which are distributed in an isosceles trapezoid array, wherein the two first inserting portions 2312 of the first metal pin 231 are inserted into two insertion holes 131 which are diagonally distributed, and the two third inserting portions 2322 of the third metal pin 232 are inserted into the other two insertion holes 131′ which are diagonally distributed. The second ends of the two first inserting portions 2312 of the first metal pin 231 form two pin ends. And the second ends of the two third inserting portions 2322 of the third metal pin 232 form the other two pin ends. The mounting surface 134 of the magnetic core 13 abuts against the circuit board, and the four pin ends are connected to the circuit board. The mounting surface 134 of the magnetic core 13 is provided with four fourth limiting grooves 136, in which the four pin ends are arranged.
Example embodiments are provided so that this disclosure will be thorough and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms, and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail. In addition, advantages and improvements that may be achieved with one or more exemplary embodiments of the present disclosure are provided for purposes of illustration only and do not limit the scope of the present disclosure, as exemplary embodiments disclosed herein may provide all or none of the above mentioned advantages and improvements and still fall within the scope of the present disclosure.
Specific dimensions, specific materials, and/or specific shapes disclosed herein are example in nature and do not limit the scope of the present disclosure. The disclosure herein of particular values and particular ranges of values for given parameters are not exclusive of other values and ranges of values that may be useful in one or more of the examples disclosed herein. Moreover, it is envisioned that any two particular values for a specific parameter stated herein may define the endpoints of a range of values that may be suitable for the given parameter (i.e., the disclosure of a first value and a second value for a given parameter can be interpreted as disclosing that any value between the first and second values could also be employed for the given parameter). For example, if Parameter X is exemplified herein to have value A and also exemplified to have value Z, it is envisioned that parameter X may have a range of values from about A to about Z. Similarly, it is envisioned that disclosure of two or more ranges of values for a parameter (whether such ranges are nested, overlapping or distinct) subsume all possible combination of ranges for the value that might be claimed using endpoints of the disclosed ranges. For example, if parameter X is exemplified herein to have values in the range of 1-10, or 2-9, or 3-8, it is also envisioned that Parameter X may have other ranges of values including 1-9, 1-8, 1-3, 1-2, 2-10, 2-8, 2-3, 3-10, and 3-9.
The term “about” when applied to values indicates that the calculation or the measurement allows some slight imprecision in the value (with some approach to exactness in the value; approximately or reasonably close to the value; nearly). If, for some reason, the imprecision provided by “about” is not otherwise understood in the art with this ordinary meaning, then “about” as used herein indicates at least variations that may arise from ordinary methods of measuring or using such parameters. For example, the terms “generally”, “about”, and “substantially” may be used herein to mean within manufacturing tolerances.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. For example, when permissive phrases, such as “may comprise”, “may include”, and the like, are used herein, at least one embodiment comprises or includes the feature(s). As used herein, the singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements, intended or stated uses, or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2022108761912 | Jul 2022 | CN | national |
