JP3182533U - Magnetic element to prevent electromagnetic interference - Google Patents

Abstract

A magnetic element that is installed on a printed circuit board and prevents electromagnetic interference is provided.
A magnetic element 4 for preventing electromagnetic interference includes two iron cores 41, a bobbin 42 having a hollow shaft tube, and a winding wound around the surface of the bobbin 42, and is disposed on a printed circuit board. Is done. The stem of the iron core 41 extends toward the hollow shaft tube of the bobbin 42 and is inserted into the hollow shaft tube so that the iron core 41 and the bobbin 42 are coupled. The magnetic element 4 is welded to the printed circuit board by a plurality of pins 422 provided on both sides of the bobbin 42. The iron core 41 and any one pin 422 are electrically connected by the conductive paste 5. Even if electromagnetic interference occurs in the magnetic element 4, the potential of the iron core 41 is stabilized because the conductive paste 5 is electrically connected to the level Pin of the printed circuit board.
[Selection] Figure 4

Description

  The present invention relates to a magnetic element that prevents electromagnetic interference, and more particularly to a magnetic element that is installed on a printed circuit board to prevent electromagnetic interference.

Please refer to FIG. 1A and FIG. 1B. As shown in FIGS. 1A and 1B, the conventional magnetic element 1 includes at least two iron cores 11, a bobbin 12 and a winding 13. The winding 13 is wound around the surface of the bobbin 12.
As shown in FIG. 1B, when the upper and lower iron cores 11 are inserted into the bobbin 12 and joined, the complete magnetic element 1 is completed. A plurality of pins 121 are provided on both sides of the bobbin 12.
As shown in FIG. 2, the magnetic element 1 is inserted on the printed circuit board 2 through pins 121.

In order to prevent Electromagnetic Interference (EMI), which is increasing with the development of high-tech technology, the magnetic element 1 is inserted into the printed circuit board 2 to generate an electromagnetic action on the magnetic element 1, and the surroundings Electromagnetic interference is generated in the element.
Therefore, in order to solve the above-mentioned problem, some manufacturers wrap a layer of copper foil 14 around the surface of the completed magnetic element 1 (as shown in FIG. 2, the copper foil 14 is wrapped around the surface of the iron core 11. After that, the magnetic element 1 is inserted on the printed circuit board 2), the EMI action is blocked, one end of the connection wire 3 is welded to the surface of the copper foil 14, and the other end of the printed circuit board 2 is Weld to level Pin (ground terminal, positive voltage terminal or negative voltage terminal) 21 to prevent electromagnetic interference from occurring in magnetic element 1.

In the prior art, in order to prevent electromagnetic interference, one layer of copper foil 14 has to be wound, and one connection line 3 has to be additionally connected. When manufacturing a magnetic element, one layer of copper foil 14 must be additionally wound, and the connecting wire 3 must be welded to the copper foil 14.
For this reason, the manufacturing cost is increased, and if the connecting line 3 is too long, other undesirable effects and interference may occur. Since the connecting wire 3 has one end welded to the copper foil 14 and the other end welded to the printed circuit board 2, the length required to weld the connecting wire 3 to the printed circuit board 2 when the magnetic element 1 is attached. May be insufficient. In order to prevent this, it is necessary to lengthen the connection line 3 so that the other end of the connection line 3 can be welded to the printed circuit board 2, but sometimes the connection line 3 becomes too long, and the connection line 3 is broken or bent. There was a fear.

  Therefore, it is possible to easily connect the magnetic element and the printed circuit board, eliminate the need to additionally weld the connecting wire, reduce the manufacturing cost, and reduce the extra material cost. Technology was sought.

  An object of the present invention is to electrically connect an iron core and any one pin with a conductive paste, and electrically connect any one pin with a level Pin, thereby allowing the conductive paste and the printed circuit board to be connected. An object of the present invention is to provide a magnetic element that is electrically connected to a level Pin to stabilize the iron core potential and prevent electromagnetic interference.

  In order to solve the above-mentioned problems, electromagnetic interference is provided that includes two iron cores, a bobbin having a hollow shaft tube, and a winding wound around the surface of the bobbin, and is disposed on a printed circuit board. The iron core stem extends toward the hollow shaft tube of the bobbin, and is inserted into the hollow shaft tube to couple the iron core and the bobbin. A plurality of pins provided on both sides of the bobbin are welded to the printed circuit board, and the iron core and any one of the pins are electrically connected by a conductive paste, and electromagnetic interference occurs in the magnetic element. However, since the conductive paste is electrically connected to the level Pin of the printed circuit board, the potential of the iron core is stabilized, and a magnetic element for preventing electromagnetic interference is provided. It is.

  The shape of the stem preferably matches the hollow shaft tube of the bobbin.

  The hollow shaft tube is preferably provided with an opening on the stem side, and the stem is inserted into the hollow shaft tube through the opening.

  The level Pin is preferably a ground terminal, a positive voltage terminal, or a negative voltage terminal.

  The magnetic element is preferably attached to the surface of the printed circuit board in a solid shape and welded.

  The pins of the magnetic element are preferably welded to the back surface of the printed circuit board after being inserted into the printed circuit board.

It is a front view which shows a state when the conventional magnetic element is disassembled. It is a front view which shows a state when the conventional magnetic element is assembled. It is an application figure which shows the conventional magnetic element. 1 is an exploded perspective view showing a magnetic element for preventing electromagnetic interference according to an embodiment of the present invention. 1 is an exploded perspective view showing a magnetic element for preventing electromagnetic interference according to an embodiment of the present invention. It is a front view which shows the magnetic element which prevents the electromagnetic interference which concerns on one Embodiment of this invention. It is a figure which shows typically an example of the magnetic element which prevents the electromagnetic interference which concerns on one Embodiment of this invention.

Please refer to FIG. 3A and FIG. 3B. 3A and 3B are exploded perspective views illustrating a magnetic element for preventing electromagnetic interference according to an embodiment of the present invention. 3A and 3B, the magnetic element 4 for preventing electromagnetic interference according to an embodiment of the present invention includes at least two iron cores 41, a bobbin 42 having a hollow shaft tube 421, and a surface of the bobbin 42. And a wound winding 43.
A stem 411 (stem) of the iron core 41 is extended toward the hollow shaft tube 421 of the bobbin 42. As shown in FIG. 3A, the winding 43 is wound around the surface of the bobbin 42 (the bobbin 42 has an E-shaped structure, and the winding 43 is wound on the wall surface between the concave portions on both sides of the E-shape. ) The shape of the stem 411 of the two iron cores 41 matches the hollow shaft tube 421 of the bobbin 42.
An opening 4211 is provided on the stem 411 side of the hollow shaft tube 421, and two upper and lower iron cores 41 are inserted into the opening 4211 (two openings 4211 are provided above and below the bobbin 42 at locations corresponding to the iron core 41. The stem 411 is inserted into the hollow shaft tube 421 through the opening 4211, and the iron core 41 is coupled to the bobbin 42 as shown in FIG. 3B.

Since an adhesion / conduction area 44 is provided between the iron core 41 and the pin 422 of the magnetic element 4, the conductive paste 5 is applied onto the adhesion / conduction area 44, and the conductive paste 5 is adhered to the adhesion / conduction area. When solidified on 44, the conductive paste 5 is bonded to the iron core 41 and the pin 422 as shown in FIG. 4 (because the conductive paste 5 has conductive properties, the conductive paste 5 causes the iron core 41 and the pin 422 to adhere. And are electrically connected).
Further, in order to prevent the iron core 41 from being unnecessarily adhered to the pin 422 having a certain function, the iron core 41 is adhered to the pin 422 that does not need to be operated.

When the magnetic element 4 is welded to the printed circuit board 6 (there are two types of welding methods, the first type is a solid form on the surface of the printed circuit board 6 by the surface mount device (SMD)). The second type is a method in which the pins of the magnetic element 4 are inserted into the through holes on the surface of the printed circuit board 6 and the pins are welded to the back surface of the printed circuit board 6). 5, the pin 422 electrically connected to the conductive paste 5 is electrically connected to the level Pin 61 (level Pin) (ground terminal, positive terminal or negative terminal) or level Pin 61 of the printed circuit board 6. Connected to the contact.
For this reason, when the magnetic element 4 operates on the printed circuit board 6, electromagnetic interference occurs in the magnetic element 4, but the iron core 41 of the magnetic element 4 is at the level of the printed circuit board 6 through the conductive paste 5. Since it is electrically connected to the Pin 61, the potential level of the iron core 41 is stabilized and a change due to electromagnetic interference is canceled to prevent a problem from occurring due to electromagnetic interference.

As can be seen from the above, the magnetic element for preventing electromagnetic interference according to the present invention has the following advantages (1) and (2) as compared with the prior art.
(1) Since the iron core and any one pin are electrically connected by the conductive paste and the pin and the level Pin of the printed circuit board are electrically connected, the potential of the iron core is stabilized.
(2) Electromagnetic interference can be prevented without additionally increasing the number of connection lines, manufacturing costs can be reduced, unnecessary material costs can be reduced, and connection lines can be used. There are no problems with the prior art that have occurred (for example, problems such as the lines being too long, adversely affecting the circuit, causing interference, and the connecting lines being bent or broken).

  The preferred embodiments of the present invention have been disclosed as described above so that those skilled in the art can understand them, but these do not limit the present invention in any way. Various changes and modifications can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the utility model registration claim of the present invention should be broadly interpreted including such changes and modifications.

DESCRIPTION OF SYMBOLS 1 Magnetic element 2 Printed circuit board 3 Connection line 4 Magnetic element 5 Conductive paste 6 Printed circuit board 11 Iron core 12 Bobbin 13 Winding 14 Copper foil 21 Level Pin
41 Iron core 42 Bobbin 43 Winding 44 Adhesion / conduction area 61 Level Pin
121 Pin 411 Stem 421 Hollow shaft tube 422 Pin 4211 Opening

Claims (6)

A magnetic element for preventing electromagnetic interference, comprising two iron cores, a bobbin having a hollow shaft tube, and a winding wound around the surface of the bobbin, and disposed on a printed circuit board,
The core of the iron core extends toward the hollow shaft tube of the bobbin, and is inserted into the hollow shaft tube to couple the iron core and the bobbin.
The magnetic element is welded to the printed circuit board by a plurality of pins provided on both sides of the bobbin,
The iron core and any one of the pins are electrically connected by a conductive paste,
Even if electromagnetic interference occurs in the magnetic element, since the conductive paste is electrically connected to the level Pin of the printed circuit board, the potential of the iron core is stabilized.
Magnetic element that prevents electromagnetic interference.   The magnetic element for preventing electromagnetic interference according to claim 1, wherein the shape of the stem matches the hollow shaft tube of the bobbin.   The magnetic element for preventing electromagnetic interference according to claim 1, wherein the hollow shaft tube has an opening on the stem side, and the stem is inserted into the hollow shaft tube through the opening.   The magnetic element for preventing electromagnetic interference according to claim 1, wherein the level Pin is a ground terminal, a positive voltage terminal, or a negative voltage terminal.   The magnetic element according to claim 1, wherein the magnetic element is attached to the surface of the printed circuit board in a solid shape and welded.   The magnetic element for preventing electromagnetic interference according to claim 1, wherein the pin of the magnetic element is welded to a back surface of the printed circuit board after being inserted into the printed circuit board.

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