TWM461304U - Magnetic beads and printed circuit board using the magnetic beads - Google Patents

Abstract

The utility model provides a magnetic bead which comprises a magnetic ring and two pins arranged at two ends of the magnetic ring, the magnetic ring comprises a through hole, the pins are in electric connection with the through hole of the magnetic ring, the pins are cylinder-shaped, one bottom surface of the cylinder shape contacts with the magnetic ring, and the side face is protruded out of the outer surface of the magnetic ring to enable the side faces of the pins to contact with the printed circuit board. The side faces of the pins of the magnetic bead are protruded out of the outer surface of the magnetic ring, when the bead is arranged on the circuit board, the side faces of the pins can be connected with the circuit board directly, no matter how the magnetic bead rotates, the side faces of the pins can always contact with the circuit board in advance of the magnetic ring, and judging of the direction of the magnetic bead during installation is avoided. Use is convenient, production efficiency is improved, and the defect rate is reduced.

Description

Magnetic bead and printed circuit board using the same

This creation relates to a filtering technique, and more particularly to a patch type magnetic bead and a printed circuit board using the same.

The function of the magnetic beads is mainly to eliminate high frequency electromagnetic noise existing in the transmission line structure (circuit), which is a high frequency spike or harmonic interference component superimposed on the transmission circuit, wherein the low frequency or direct current component A signal that is needed and useful, but the electromagnetic noise energy is unwanted electromagnetic interference along the line transmission and radiation (EMI). To eliminate these unwanted signal energies, magnetic beads can be used to act as high frequency resistors, such as attenuators, which are capable of filtering high frequency AC signals because they allow low frequency or DC signals to pass. Since the magnetic beads can attenuate higher frequency electromagnetic noise and at the same time allow lower frequency electromagnetic noise to pass through almost unimpeded, it has been widely used in EMI control. Magnetic beads for EMI absorption electromagnetic noise can be made into various shapes and are widely used in various applications. For example, on a printed circuit board (PCB), it can be added to DC/DC modules, data lines and power lines. The magnetic beads absorb high frequency interference signals on the line, but do not generate new poles throughout the system, so the stability of the system is not compromised. In addition, the use of magnetic beads in conjunction with the power supply filter complements the performance of the high-frequency side of the filter and improves the filtering characteristics of the system.

The current patch type magnetic beads are square, circular or triangular magnetic rings, matching eight The structure of the gravure outer or the I-shaped concave pin. As shown in FIG. 1A, it is a schematic diagram I of a magnetic bead in the prior art; and FIG. 1B is a schematic view II of a magnetic bead in the prior art. Referring to FIG. 1A and FIG. 1B, a magnetic bead 101 has a magnetic ring 102 and at least two pins 103. The pin 103 passes through the inside of the magnetic ring 102. The magnetic ring 102 can be Round (as shown in Figure 1A) or square (as shown in Figure 1B). The two ends of the pin 103 are connected to a printed circuit board, so that current can pass through the magnetic beads, thereby realizing the function of the magnetic beads to filter the AC signal. As shown in FIG. 1A, a schematic diagram of a magnetic bead mounted on a printed circuit board is mounted on a front surface of a printed circuit board 105. The magnetic bead 101 is mounted on the back side of the printed circuit board 105. Both ends of the pin 103 of the bead 101 are electrically connected to the printed circuit board 105.

In the existing magnetic beads, the pin is bent from the magnetic ring and connected to the printed circuit board, so the direction of the magnetic beads needs to be specially identified during the production process to ensure that the pin is bent. Both ends are connected to the printed circuit board. If the direction is incorrectly determined, the magnetic ring is connected to the printed circuit board, and the magnetic beads are not electrically connected to the printed circuit board. Therefore, in the production process, the discrimination of the direction of the magnetic beads takes a long time, thus affecting the production efficiency, and there is also a risk of reversing the reverse, which affects the quality of the product, resulting in an increase in the defective product rate.

The technical problem to be solved by the present invention is to provide a magnetic bead which is easy to use and which does not need to distinguish the mounting direction and a printed circuit board using the same.

In order to solve the above problems, the present invention provides a magnetic bead including a magnetic ring and two pins at two ends of the magnetic ring. The magnetic ring includes a through hole, and the pin is electrically connected via the through hole of the magnetic ring. The pin is a cylindrical shape, and a bottom surface of the cylindrical surface is in contact with the magnetic ring, and one side of the pin protrudes outside the outer surface of the magnetic ring to enable the side of the pin to be printed Brush the board contacts.

In an embodiment of the present invention, the two pins are respectively provided with a mating connecting member facing one side of the through hole, and the connecting member passes through the through hole and is inserted into each other.

In one embodiment of the present invention, the connecting member and a portion of the pin connection are a metal rod, and the portion connected to the other pin is a metal socket that cooperates with the metal rod.

In an embodiment of the present invention, a connecting rod is included, the pin has a through hole, and the connecting rod passes through the pin and one of the through holes of the magnetic ring so as to be disposed at the two ends of the through hole Electrically connected, the connecting rod has a bent portion from the through hole of the pin for fixing the pin to both ends of the magnetic ring.

In an embodiment of the present invention, the magnetic ring is cylindrical or prismatic.

A printed circuit board comprising a transistor, further comprising at least one of the magnetic beads, the pin of the magnetic bead being electrically connected to the printed circuit board.

In an embodiment of the present invention, the transistor is disposed on a surface of the printed circuit board, and the magnetic bead is disposed on the other surface of the printed circuit board.

The advantage of the present invention is that the pin of the magnetic bead is cylindrical, and one of the bottom surfaces of the cylindrical body is in contact with the magnetic ring, and the side of the pin protrudes beyond the outer surface of the magnetic bead when the magnetic bead is When mounted on a printed circuit board, the side of the pin can be directly connected to the printed circuit board, and the bead of the present invention can always be rotated before the magnetic ring and the magnetic ring The printed circuit board is in contact so that the orientation of the magnetic beads does not have to be identified during installation. Therefore, in addition to increasing the convenience of use, the production efficiency is improved due to the reduction in the defective product rate.

201‧‧‧Magnetic beads

202‧‧‧ magnetic ring

203‧‧‧ pin

205‧‧‧Printed circuit board

206‧‧‧through hole

207‧‧‧Metal rod

208‧‧‧Metal jack

209‧‧‧through hole

210‧‧‧Connecting rod

211‧‧‧ side

212‧‧‧ outer surface

301‧‧‧Optoelectronics

302‧‧‧Magnetic beads

303‧‧‧ pin

1A is a schematic view of the structure of a magnetic bead in the prior art; FIG. 1B is a schematic view II of a magnetic bead in the prior art; FIG. 1C is a schematic view showing a magnetic bead mounted on a printed circuit board; The figure is a schematic view of the magnetic bead structure of the present embodiment; FIG. 2B is a schematic structural view of the magnetic bead mounted on the printed circuit board of the present embodiment; FIG. 3A is a schematic structural view of the magnetic ring of the present embodiment. FIG. 3B is a schematic structural diagram of one of the pins of the present embodiment; FIG. 3C is a schematic structural view of another pin of the present embodiment; FIG. 3D is a schematic diagram of two embodiments of the present embodiment. FIG. 4A is a schematic structural view of a pin of the present embodiment; FIG. 4B is a schematic structural view of a connecting rod of the present embodiment; FIG. 4C is a connection diagram of the present embodiment. FIG. 5 is a schematic structural view of a printed circuit board according to another embodiment of the present invention. FIG.

The specific embodiment of the magnetic beads provided by the present creation will be described in detail below with reference to the accompanying drawings.

FIG. 2A is a schematic structural view showing a specific embodiment of the magnetic beads of the present invention. As shown in FIG. 2A, the magnetic bead 201 includes a magnetic ring 202 and two pins 203 disposed at two ends of the magnetic ring 202. The magnetic ring 202 includes a through hole 206 (indicated in FIG. 3A). The pins 203 disposed at the two ends of the magnetic ring 202 are electrically connected via the through holes 206 of the magnetic ring 202.

The pin 203 is a cylindrical shape, and a bottom surface of the cylindrical shape and the magnetic ring 202 In contact, the side 211 of the pin 203 protrudes beyond the outer surface 212 of the magnetic ring 202 such that the side 211 of the pin is electrically connected to a printed circuit board 205. When the bead 201 is attached to the printed circuit board 205, the side 211 of the pin 203 is in direct electrical contact with a surface of the printed circuit board 205, as shown in FIG. 2B. The side 211 of the pin 203 protrudes beyond the outer surface 212 of one of the magnetic rings 202. Therefore, when the magnetic bead 201 is mounted on the printed circuit board 205, the side 211 of the pin 203 can be directly connected to the printed circuit board 205, and the magnetic bead 201 is rotated anyway, the pin 203 The side 211 is always able to contact the printed circuit board 205 prior to the magnetic ring 202, thereby eliminating the need to discern the orientation of the magnetic beads during installation. Therefore, in addition to increasing the convenience of use, the production efficiency is improved due to the reduction in the defective product rate.

The magnetic ring 202 is composed of a ferrite magnet material. When a current is passed, the magnetic ring 202 can filter a high frequency alternating current signal, allowing low frequency or direct current signals to pass, thereby eliminating useless electromagnetic interference in the line. The pin 203 is made of a metal material such as copper, gold, silver, or the like. The pin 203 is in surface contact with the copper foil of the printed circuit board 205 to achieve electrical contact between the printed circuit board 205 and the pin 203.

In the present embodiment, the electrical connection between the pins 203 is achieved by a connecting member. FIG. 3A is a schematic view showing the structure of the magnetic ring in the present embodiment. Referring to FIG. 3A, the magnetic ring 202 has a through hole 206 extending through the magnetic ring 202. The pin 203 is disposed at both ends of the through hole 206.

FIG. 3B is a schematic structural view of one of the pins of the present embodiment; FIG. 3C is a schematic structural view of another pin of the present embodiment; FIG. 3D is a schematic structural view of the two-pin combination . As shown in FIGS. 3B, 3C, and 3D, the lead 203 faces one of the surfaces of the through hole 206, and is respectively provided with a mating connecting member, and the connecting member can be The electrical connection between the pins 203 is realized. In the present embodiment, the connecting member is connected to a pin 203 as a metal rod 207, and the portion connected to the other pin 203 is a metal jack 208, wherein the metal rod 207 can be inserted into the metal plug. In the hole 208, the metal rod 207 and the metal socket 208 cooperate with each other to realize electrical connection between the two pins 203.

The two-part metal rod 207 of the connecting member is connected to the metal socket 208 in the through hole 206 of the magnetic ring 202, so that not only the electrical connection between the two pins 203 but also the magnetic ring 202 can be supported. The pin 203 and the magnetic ring 202 are formed into the magnetic bead 201, as shown in FIG. 2A.

In another embodiment of the present invention, the electrical connection between the pins 203 is achieved by the connecting rod. Fig. 4A is a schematic view showing the structure of the lead; Fig. 4B is a schematic view showing the structure of the lead; and Fig. 4C is a schematic view showing the structure of the magnetic bead connected by the connecting rod. As shown in FIG. 3A, FIG. 4A, FIG. 4B and FIG. 4C, the magnetic ring 202 has a through hole 206, and the two pins 203 have a through hole 209, wherein the through hole 209 of the pin 203 and the magnetic ring 202 The through hole 206 is communicated, and the connecting rod 210 passes through the pin 203 and the through holes 209 and 206 of the magnetic ring 202, and the connecting rod 210 is electrically connected to the pin 203, thereby realizing the pin 203. Electrical connection. At the same time, the connecting rod 210 can also increase the role of supporting the magnetic ring 202. Further, the connecting rod 210 has a bent portion extending from the through hole 209 of the pin for fixing the pin 206 to both ends of the magnetic ring 202.

The magnetic ring 202 can be a cylindrical shape or a prismatic shape, and only needs to conform to the side of the pin 203 higher than the side of the magnetic ring 202. In any case, the magnetic bead is rotated, and the pin 203 is always associated with the printed circuit. The board can be touched.

Figure 5 is a schematic view showing the structure of a printed circuit board of the present invention. See As shown in FIG. 5, a printed circuit board of the present invention includes a transistor 301 and a magnetic bead 302. In the present embodiment, the transistor 301 is disposed on a surface of the printed circuit board, the magnetic bead 302 is disposed on the other surface of the printed circuit board, and the pin 303 of the magnetic bead 302 and the printed circuit board The copper foil surface is electrically connected. The above connection method may be any connection method well known to those skilled in the art, such as soldering, conductive paste bonding or the like. In the present embodiment, the structure of the magnetic bead 302 is the same as that of the magnetic bead described above, and details are not described herein again.

Although the present invention has been disclosed in its preferred embodiments, it is not intended to limit the present invention, and anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. The scope of protection is subject to the definition of the scope of the patent application.

201‧‧‧Magnetic beads

202‧‧‧ magnetic ring

203‧‧‧ pin

211‧‧‧ side

212‧‧‧ outer surface

Claims (7)

A magnetic bead includes: a magnetic ring and two pins at two ends of the magnetic ring, wherein the magnetic ring includes: a through hole, and the pin is electrically connected via the through hole of the magnetic ring, wherein the pin is A cylindrical shape, and a bottom surface of the cylindrical surface is in contact with the magnetic ring, and one of the pins protrudes laterally from an outer surface of the magnetic ring to contact the side of the lead with a printed circuit board. The magnetic bead according to claim 1, wherein the two pins are respectively disposed with one of the connecting members facing the through hole, and the connecting member passes through the through hole and is inserted into each other. The magnetic bead according to claim 2, wherein the connecting member and a part of the pin connected to the pin are a metal rod, and the other pin of the pin is connected to the metal The rods cooperate with one of the metal jacks. The magnetic bead according to claim 1, further comprising: a connecting rod, wherein the pin has a through hole respectively, and the connecting rod passes through the pin and the through hole of the magnetic ring, so as to be disposed on The pin is electrically connected to the two ends of the through hole, wherein the connecting rod has a bent portion from the protruding portion of the through hole for fixing the pin to the two ends of the magnetic ring . The magnetic bead of claim 1, wherein the magnetic ring is cylindrical or prismatic. A printed circuit board comprising: a transistor, the transistor further comprising: at least one magnetic bead as claimed in claim 1, wherein one of the pins of the magnetic bead and a printed circuit board are electrically connected. The printed circuit board of claim 6, wherein the transistor is disposed on one side of the printed circuit board, and the magnetic bead is disposed on the other side of the printed circuit board.