JP2015076571A - Noise filter for power supply, and usb connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a common mode noise and a differential mode noise transmitted to a power supply line.SOLUTION: A noise filter 1 for a power supply comprises first and second internal electrodes 6 and 7 provided in a core member 2. The first and second internal electrodes 6 and 7 are formed in a double spiral shape by series-connecting a plurality of first and second spiral patterns 8 and 9. The first and second spiral patterns 8 and 9 comprises first and second same direction parallel line parts 8A and 9A, first and second crossing parts 8B and 9B, and first and second reverse direction parallel line parts 8C and 9C. When a signal of a common mode or a differential mode is propagated to the first and second internal electrodes 6 and 7, between mutual induction generated at the first and second same direction parallel line parts 8A and 9A and mutual induction generated at the first and second reverse direction parallel line parts 8C and 9C, positive coupling and negative coupling are opposite to each other.

Description

  The present invention relates to a power supply noise filter and a USB connector suitable for use in countermeasures against power line noise.

  Generally, a core member made of a magnetic material, first and second internal electrodes provided inside the core member, and first and second external electrodes provided at the end of the core member are provided. A power supply noise filter is known (see, for example, Patent Document 1).

  In the power supply noise filter described in Patent Document 1, the first coil is formed by the first internal electrode, and the second coil is formed by the second internal electrode. At this time, the first coil and the second coil are provided inside the magnetic body serving as the core member and stacked on each other.

JP 2009-302580 A

  By the way, the noise filter for power supply described in Patent Document 1 is configured such that a plurality of first and second coils are stacked and inductance is generated by these coils, so that the impedance of each of the common mode and the differential mode (normal mode) is obtained. It is a structure that raises the height. For this reason, there exists a tendency for the thickness dimension of a core member to become large easily. The noise suppression effect depends on the width dimension and thickness dimension of the internal electrode. In other words, the inductance becomes higher when the width of the internal electrode is reduced to increase the number of turns of the coil and more coils are stacked. However, in such a configuration, there is a problem that it is difficult to flow a large current through the internal electrodes, and it is difficult to achieve both a noise suppression effect and a large current.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to reduce the common mode noise and differential mode noise conducted to the power supply line, and to reduce power supply noise corresponding to a large current. It is to provide a filter and a USB connector.

  In order to solve the above-mentioned problems, a first aspect of the present invention includes a core member made of a magnetic material, and a first and second core member provided inside the core member and supplied with a power supply voltage on one side and connected to the ground on the other side. A power supply noise filter comprising: an internal electrode of the first and second external electrodes provided at an end of the core member and connected to the first and second internal electrodes, respectively. The first and second inner electrodes are connected to each other in series by connecting a plurality of first and second spiral patterns that are rotated halfway while moving from one end to the other end in the length direction and their positions are interchanged. The first and second spiral patterns are arranged at different positions in the thickness direction and the width direction of the core member, and extend in parallel in the same direction toward the length direction. And the first and second same-direction parallel lines Connected to the ends of the core member and extending in opposite directions to the width direction of the core member, and connected to the ends of the first and second intersections. First and second reverse parallel line sections extending in parallel in opposite directions toward the thickness direction of the core member, and signals in common mode or differential mode are transmitted to the first and second internal electrodes. In the mutual induction generated in the first and second in-parallel parallel line portions and the mutual induction generated in the first and second reverse parallel line portions when propagating, the positive coupling and the negative coupling are opposite to each other. It is characterized by becoming a relationship.

  According to a second aspect of the present invention, the length in the length direction of the first and second parallel parallel line portions is longer than the thickness in the thickness direction of the first and second reverse parallel line portions. It is in having a configuration.

  According to a third aspect of the present invention, at one end of the core member in the length direction, the first external electrode on the input side connected to one end of the first internal electrode and one end of the second internal electrode The second external electrode on the output side connected to the first external electrode is disposed on the other end in the length direction of the core member, and the first on the output side connected to the other end of the first internal electrode. External electrodes and the second external electrode on the input side connected to the other end of the second internal electrode are disposed on one side in the width direction of the core member, the first on the input side. External electrodes and the second external electrode on the input side are arranged, and on the other side in the width direction of the core member, the first external electrode on the output side and the second external electrode on the output side The configuration is such that is arranged.

  According to a fourth aspect of the present invention, a concave portion for avoiding contact with other signal lines is formed at an intermediate position in the length direction of the core member.

  According to a fifth aspect of the present invention, there is provided a core member made of a magnetic material, first and second internal electrodes provided inside the core member, to which a power supply voltage is supplied to one side and a ground is connected to the other, and the core member A power source noise filter including first and second external electrodes connected to the first and second internal electrodes, respectively, wherein the first and second internal electrodes are , First and second same-direction parallel line sections that are arranged at different positions in the thickness direction and the width direction of the core member and extend in parallel in the same direction with respect to the length direction, and the thickness direction of the core member Alternatively, the first and second reverse parallel line sections extending in parallel in opposite directions with respect to the width direction, the first and second parallel parallel line sections and the first and second reverse directions. Parallel line sections are alternately connected, and the first and second internal electrodes are connected to each other. Between the mutual induction generated in the first and second parallel parallel line sections and the mutual induction generated in the first and second reverse parallel line sections when the signal in the non-mode or differential mode propagates. It is characterized in that the negative bond and the negative bond are opposite to each other.

  The invention of claim 6 is a USB connector provided with the noise filter for power supply according to the present invention, wherein a power supply voltage terminal to which a power supply voltage is supplied, a pair of differential signal terminals to which a differential signal is supplied, and a ground The first external electrode is connected to the power supply voltage terminal, and the second external electrode is connected to the ground terminal.

  According to the first aspect of the present invention, the first and second internal electrodes are directed in the thickness direction and the first and second same-direction parallel line portions extending in parallel in the same direction toward the length direction. And first and second reverse parallel line sections extending in parallel in opposite directions. Here, for example, when a signal in the same direction propagates to the first and second reverse parallel line sections in the common mode, a signal in the reverse direction propagates to the first and second parallel parallel line sections. For this reason, in the first and second reverse parallel line portions, mutual induction of positive coupling occurs, so that the combined inductance of the first and second internal electrodes can be increased by the mutual inductance between them. On the other hand, for example, when a signal in the same direction propagates to the first and second parallel parallel line sections in the differential mode, a signal in the reverse direction is propagated to the first and second reverse parallel line sections. For this reason, since mutual induction of positive coupling occurs in the first and second co-directional parallel line sections, the combined inductance of the first and second internal electrodes can be increased by the mutual inductance between them.

  Thereby, since both the common mode impedance and the differential mode impedance in the first and second internal electrodes can be increased, both the common mode noise and the differential mode noise conducted to the power supply line can be reduced. Further, since the mutual inductance is generated by the first and second parallel parallel line sections and the first and second reverse parallel line sections without using a spiral coil, the first and second internal lines are generated. The width dimension and thickness dimension of the electrode can be increased, and the current that can be supplied can be increased.

  According to invention of Claim 2, the dimension of the length direction of the 1st, 2nd same direction parallel line part is formed longer than the dimension of the thickness direction of the 1st, 2nd reverse direction parallel line part. ing. Thereby, the positive coupling mutual inductance generated between the first and second in-parallel parallel line sections is higher than the positive coupling mutual inductance generated between the first and second reverse parallel line sections. For this reason, one of the common mode impedance and the differential mode impedance can be increased.

  For example, in the differential mode, when a reverse signal propagates to the first and second reverse parallel line sections and a same direction signal propagates to the first and second parallel parallel line sections, the magnetic field and While the current suppression effect is generated between the first and second reverse parallel line portions due to the interaction of the current, the current suppression effect is small between the first and second same direction parallel line portions. In this case, in the common mode, a current suppression effect is generated between the first and second parallel parallel line portions, whereas a current suppression effect is small between the first and second reverse parallel line portions.

  In the invention of claim 2, since the lengthwise dimension of the first and second parallel parallel line sections is longer than the thickness dimension of the first and second reverse parallel line sections, the differential mode Thus, the current suppression effect generated in the first and second reverse parallel line portions is smaller than the current suppression effect generated in the first and second same direction parallel line portions in the common mode. As a result, the current that can be supplied to the power supply line can be increased by propagating the signal in the same direction to the first and second parallel parallel line sections in the differential mode.

  According to the invention of claim 3, the first and second external electrodes on the input side are formed on one side in the width direction of the core member, and the first and second external electrodes on the other side in the width direction of the core member are formed. A second external electrode is formed. For this reason, the power supply line and ground line on the input side are arranged on one side in the width direction of the core member, and the power supply line and ground line on the output side are arranged on the other side in the width direction of the core member. The filter can be easily connected between the power line on the input side and the output side.

  According to invention of Claim 4, since the recessed part was formed in the middle position of the length direction of a core member, a contact with the signal line etc. of a USB connector can be avoided by a recessed part.

  According to the invention of claim 5, the first and second internal electrodes include the first and second same-direction parallel line portions extending in the same direction in the length direction and the thickness direction or the width. First and second reverse parallel line sections extending in parallel in opposite directions toward the direction. Here, for example, when a signal in the same direction propagates to the first and second reverse parallel line sections in the common mode, a signal in the reverse direction propagates to the first and second parallel parallel line sections. For this reason, in the first and second reverse parallel line portions, mutual induction of positive coupling occurs, so that the combined inductance of the first and second internal electrodes can be increased by the mutual inductance between them. On the other hand, for example, when a signal in the same direction propagates to the first and second parallel parallel line sections in the differential mode, a signal in the reverse direction is propagated to the first and second reverse parallel line sections. For this reason, positive coupling mutual induction occurs in the first and second co-directional parallel line sections, so that the combined inductance can be increased by the mutual inductance between them.

  Thereby, since both the common mode impedance and the differential mode impedance in the internal electrode can be increased, both the common mode noise and the differential mode noise conducted to the power supply line can be reduced. Further, since the mutual inductance is generated by the first and second parallel parallel line sections and the first and second reverse parallel line sections without using a spiral coil, the first and second internal lines are generated. The width dimension and thickness dimension of the electrode can be increased, and the current that can be supplied can be increased.

  According to the invention of claim 6, the first external electrode is connected to the power supply voltage terminal, and the second external electrode is connected to the ground terminal. Thus, by using the power supply noise filter of the present invention for the power line of the USB connector, even when high-frequency common mode noise and differential mode noise of, for example, 100 MHz or more are easily mixed into the power line by the surrounding signal line, Both common mode noise and differential mode noise can be reduced.

It is a perspective view which shows the noise filter for power supplies by 1st Embodiment. It is a disassembled perspective view which decomposes | disassembles and shows the noise filter for power supplies in FIG. It is the top view which looked at the noise filter for power supplies by 1st Embodiment from the arrow III-III direction in FIG. It is sectional drawing which looked at the noise filter for power supplies by 1st Embodiment from the arrow IV-IV direction in FIG. It is explanatory drawing which shows the state in which the common mode signal has propagated to the noise filter for power supplies by 1st Embodiment. It is explanatory drawing which shows typically the magnetic field in the state which the common mode signal has propagated. It is a circuit diagram which shows the equivalent circuit of the internal electrode with respect to a common mode signal. It is explanatory drawing which shows the state in which the differential mode signal has propagated to the noise filter for power supplies by 1st Embodiment. It is explanatory drawing which shows typically the magnetic field of the state in which the differential mode signal has propagated. It is a circuit diagram which shows the equivalent circuit of the internal electrode with respect to a common mode signal. In a 1st embodiment and a comparative example, it is a characteristic line figure showing a frequency characteristic of common mode impedance. In a 1st embodiment and a comparative example, it is a characteristic line figure showing a frequency characteristic of differential mode impedance. It is an external appearance perspective view which shows the USB connector by 2nd Embodiment. It is a perspective view which shows the noise filter for power supplies in FIG. It is an external appearance perspective view which shows the state which mounted | wore the noise filter for power supplies with the upper surface of the board | substrate. It is sectional drawing which looked at the noise filter for power supplies from the arrow XVI-XVI direction in FIG. It is an external appearance perspective view which shows the USB connector by 3rd Embodiment. It is an external appearance perspective view which shows the state which mounted | wore the lower surface of the board | substrate with the noise filter for power supplies. It is sectional drawing which looked at the noise filter for power supplies by 3rd Embodiment from the arrow XIX-XIX direction in FIG. It is a perspective view shown in the state which saw through the core member of the noise filter for power supplies by a modification.

  Hereinafter, a power supply noise filter according to an embodiment of the present invention will be described in detail with reference to the drawings.

  First, a power supply noise filter 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4 show a power supply noise filter 1 according to a first embodiment. In the following, the thickness direction of the power supply noise filter 1 is defined as the Z direction, the length direction along the long side of the power supply noise filter 1 is defined as the X direction, and the width direction along the short side of the power supply noise filter 1 is described. Is the Y direction. The power supply noise filter 1 includes a core member 2, first and second internal electrodes 6 and 7, first external electrodes 10 and 11, second external electrodes 12 and 13, and the like.

  The core member 2 is formed using a magnetic material such as ferrite having loss and has, for example, a rectangular parallelepiped shape. The core member 2 includes, for example, three magnetic layers 3 to 5 stacked in the thickness direction. The core member 2 is configured by stacking, pressing and firing ceramic green sheets to be the magnetic layers 3 to 5 in the thickness direction (Z direction). Between the magnetic layers 3 and 4 and between the magnetic layers 4 and 5, first and second same-direction parallel line portions 8A and 9A described later are provided. The core member 2 has end faces 2A and 2B located at both ends in the length direction (X direction) and side faces 2C and 2D located at both ends in the width direction (Y direction). Here, the length direction dimension L and the width direction dimension W of the core member 2 are set to values of about several mm, for example. Further, the thickness direction dimension T of the magnetic layers 3 to 5 is set to a value of, for example, several tens of μm to several hundreds of μm.

  The first internal electrode 6 is formed inside the core member 2 by using a material having excellent conductivity such as Ag, Pd, Cu, and Al. For this reason, the circumference | surroundings of the 1st internal electrode 6 are covered with the core member 2 over the full length. The first internal electrode 6 is formed by connecting a plurality (for example, three in FIG. 3) of first spiral patterns 8 to be described later in series. Accordingly, the first internal electrode 6 extends in a spiral shape from the end surface 2A serving as one end in the length direction (X direction) of the core member 2 toward the end surface 2B serving as the other end. That is, as shown in FIGS. 3 and 4, the first internal electrode 6 reciprocates in the width direction and reciprocates in the thickness direction with the magnetic layer 4 interposed therebetween. A power supply voltage is supplied to the first internal electrode 6.

  The second internal electrode 7 is formed inside the core member 2 by using a material having excellent conductivity, almost the same as the first internal electrode 6. For this reason, the periphery of the second internal electrode 7 is covered with the core member 2 over its entire length. The second internal electrode 7 is formed by connecting a plurality (for example, three in FIG. 3) of second spiral patterns 9 to be described later in series. Thereby, the second internal electrode 7 extends in a spiral shape from the end surface 2A of the core member 2 toward the end surface 2B. That is, as shown in FIGS. 3 and 4, the second internal electrode 7 reciprocates in the width direction and reciprocates in the thickness direction with the magnetic layer 4 interposed therebetween. A ground is connected to the second internal electrode 7.

  The first internal electrode 6 and the second internal electrode 7 are arranged in the length direction (X direction) while the positions of the core member 2 in the width direction (Y direction) and the thickness direction (Z direction) are interchanged. It extends. Therefore, when the core member 2 is viewed from above, the first internal electrode 6 and the second internal electrode 7 are shafts extending in the X direction through the midpoint of the width direction dimension W of the core member 2. Is a line-symmetric shape. When the core member 2 is viewed from the side in the Y direction, the first internal electrode 6 and the second internal electrode 7 are related to an axis extending in the X direction through the midpoint of the thickness dimension of the core member 2. It has a line-symmetric shape.

  Therefore, the first and second inner electrodes 6 and 7 are formed in a double spiral shape by being disposed inside the core member 2. Here, the width direction dimension We of the first and second internal electrodes 6 and 7 is set to a value of, for example, about several tens of μm to several hundreds of μm.

  The first spiral pattern 8 rotates halfway while proceeding from the end surface 2A to the end surface 2B of the core member 2. That is, at one end and the other end of the first spiral pattern 8, the position in the thickness direction is switched between the upper side and the lower side, and the position in the width direction is also switched between the one side and the other side. The first spiral pattern 8 includes a first parallel parallel line portion 8A, a first crossing portion 8B, and a first reverse parallel line portion 8C.

  The second spiral pattern 9 rotates halfway while proceeding from the end surface 2A to the end surface 2B of the core member 2. That is, at one end and the other end of the second spiral pattern 9, the position in the thickness direction is switched between the upper side and the lower side, and the position in the width direction is also switched between the one side and the other side. The second spiral pattern 9 includes a second same-direction parallel line portion 9A, a second crossing portion 9B, and a second reverse-direction parallel line portion 9C.

  The first and second same-direction parallel line portions 8A and 9A are arranged at different positions in the thickness direction and the width direction of the core member 2, and are parallel in the same direction from the end surface 2A to the end surface 2B of the core member 2. It extends to. The first and second same-direction parallel line portions 8A and 9A are formed by a conductor pattern made of a metal thin film, for example, together with the first and second intersecting portions 8B and 9B. The first and second same-direction parallel line portions 8A and 9A are arranged between the magnetic layers 3 and 4 or between the magnetic layers 4 and 5.

  Here, a portion connected to the first and second external electrodes 10 and 12 provided on the end surface 2A of the core member 2 in the first and second same-direction parallel line portions 8A and 9A is used as a starting end. Sites connected to the first and second external electrodes 11 and 13 provided on the end surface 2B of the member 2 are terminated. At this time, the first and second same-direction parallel line portions 8A and 9A extend in the same direction from the start end toward the end.

  The first and second co-directional parallel line portions 8A and 9A are arranged close to each other within a range where mutual insulation can be maintained in the noise frequency band. For this reason, the parallelism of the first and second same-direction parallel line portions 8A and 9A does not need to be completely parallel, and may be inclined with respect to each other within a range where mutual induction occurs. 2 and 3, the first and second co-directional parallel line portions 8A and 9A are illustrated as extending straight, but need not be linear, for example, formed in a curved shape. May be.

  The first and second intersecting portions 8B and 9B are connected to the terminal ends of the first and second same-direction parallel line portions 8A and 9A. Here, the length direction dimension Le1 of the first and second same-direction parallel line portions 8A and 9A is set to a value of about several hundred μm, for example.

  The first and second intersecting portions 8 </ b> B and 9 </ b> B extend obliquely intersecting in opposite directions with respect to the width direction of the core member 2. That is, as shown in FIG. 3, when the first and second intersecting portions 8B and 9B are viewed from above, the first and second intersecting portions 8B and 9B have an X-shape. Ends of the first and second same-direction parallel line portions 8A and 9A are connected to the start ends of the first and second intersecting portions 8B and 9B, respectively. The starting ends of the first and second reverse parallel line portions 8C and 9C are connected to the terminal ends of the first and second intersecting portions 8B and 9B, respectively. Here, the lengthwise dimension Le2 of the first and second intersecting portions 8B and 9B is set to a value of, for example, about several hundred μm.

  The first and second reverse parallel line portions 8C and 9C extend in parallel in opposite directions toward the thickness direction of the core member 2. The first and second reverse parallel line portions 8C and 9C are configured by vias penetrating the magnetic layer 4 in the Z direction. Specifically, for example, conductive materials are formed in through holes provided in the magnetic layer 4. It is formed as a columnar conductor by providing a metal material.

  Here, of the first and second reverse parallel line portions 8C and 9C, a portion connected to the first and second external electrodes 10 and 12 provided on the end surface 2A of the core member 2 is used as a starting end, and the core Sites connected to the first and second external electrodes 11 and 13 provided on the end surface 2B of the member 2 are terminated. At this time, the first and second reverse parallel line portions 8C and 9C extend in the opposite directions from the start end to the end. That is, when the first reverse parallel line portion 8C extends upward (from the magnetic layer 5 side to the magnetic layer 3 side) from the start end to the end, the second reverse parallel line portion 9C Extends downward (from the magnetic layer 3 side toward the magnetic layer 5 side) toward the end. Similarly, when the first reverse parallel line portion 8C extends downward from the start end toward the end, the second reverse parallel line portion 9C extends upward from the start end toward the end.

  The first and second reverse parallel line sections 8C and 9C are arranged close to each other within a range where mutual insulation can be maintained in the noise frequency band. For this reason, the parallelism of the first and second reverse parallel line portions 8C and 9C does not need to be completely parallel, and may be inclined with respect to each other within a range where mutual induction occurs.

  The terminal ends of the first and second intersecting portions 8B and 9B are connected to the starting ends of the first and second reverse parallel line portions 8C and 9C, respectively. Further, the start ends of the first and second in-parallel parallel line portions 8A and 9A are connected to the terminal ends of the first and second reverse parallel line portions 8C and 9C, respectively.

  Thus, the end of the first spiral pattern 8 at the first stage becomes the end of the first reverse parallel line portion 8C, and the first parallel parallel line portion 8A as the start end of the first spiral pattern 8 at the next stage. Connected to the beginning of Thereby, the some spiral pattern 8 is connected in series.

  Similarly, the end of the second spiral pattern 9 is the end of the second reverse parallel line portion 9C, and is connected to the start end of the second same-direction parallel line portion 9A as the start end of the next second spiral pattern 9 Is done. Thereby, the some spiral pattern 9 is connected in series.

  2 and 3, the first spiral pattern 8 at the final stage includes two first parallel parallel line portions 8A, one of which is connected to the start end side of the first spiral pattern 8, and the other Is connected to the terminal side of the first spiral pattern 8. For this reason, the end of the first spiral pattern 8 at the final stage is the end of the first same-direction parallel line portion 8 </ b> A located on the end surface 2 </ b> B of the core member 2. Similarly, the second spiral pattern 9 in the final stage includes two second parallel parallel line portions 9A, one of which is connected to the start end side of the second spiral pattern 9, and the other is the second spiral pattern. 9 is connected to the terminal side.

  Here, for example, the lengthwise dimension Le1 of the first and second same-direction parallel line portions 8A and 9A is the dimension in the thickness direction of the first and second reverse-direction parallel line portions 8C and 9C (magnetic material). It is formed longer than the thickness direction dimension T) of the layer 4. This increases the difference between the common mode impedance and the differential mode impedance. When it is desired to reduce the difference between the common mode impedance and the differential mode impedance, the length direction dimension Le1 of the first and second same-direction parallel line portions 8A and 9A and the first and second reverse-direction parallel line portions are used. It is preferable that the thickness direction dimensions of 8C and 9C are set to the same value.

  Further, the separation distance D in the width direction between the first and second same-direction parallel line portions 8A and 9A is set to a value of about several tens μm to several hundreds μm (for example, 20 μm to 150 μm). The value of the separation distance D is approximately the same as the separation distance in the width direction between the first and second reverse parallel line portions 8C and 9C.

  The first external electrodes 10 and 11 are provided at both ends of the core member 2, that is, at the end face 2 </ b> A and the end face 2 </ b> B, and are connected to the start end and the end of the first internal electrode 6, respectively. The first external electrodes 10 and 11 are formed, for example, by applying a conductive metal material to the end of the core member 2, firing the conductive metal material, and performing a plating process.

  The second external electrodes 12 and 13 are also provided at both ends in the length direction of the core member 2 in substantially the same manner as the first external electrodes 10 and 11, and are respectively provided at the start and end of the second internal electrode 7. It is connected. The first external electrode 10 and the second external electrode 12 are provided on the end surface 2 </ b> A of the core member 2, and are arranged at different positions in the width direction of the core member 2. Similarly, the first external electrode 11 and the second external electrode 13 are provided on the end surface 2 </ b> B of the core member 2, and are arranged at different positions in the width direction of the core member 2.

  However, the first external electrode 10 is located on one side in the width direction (front side in FIG. 1), whereas the first external electrode 11 is located on the other side in the width direction (back side in FIG. 1). positioned. The second external electrode 12 is located on the other side in the width direction (the back side in FIG. 1), whereas the second external electrode 13 is on the one side in the width direction (the near side in FIG. 1). positioned. Thereby, when the core member 2 is viewed from above, the first external electrodes 10 and 11 and the second external electrodes 12 and 13 pass through the midpoint of the width direction dimension W of the core member 2 in the X direction. It is arrange | positioned in the position symmetrical with respect to the axis | shaft extended in this.

  In the power supply noise filter 1, the end face 2 </ b> A of the core member 2 has an input-side first external electrode 10 connected to one end (starting end) of the first internal electrode 6 and one end of the second internal electrode 7. The output-side second external electrode 12 connected to the (starting end) is disposed. Further, on the end surface 2B of the core member 2, the first external electrode 11 on the output side connected to the other end (termination) of the first internal electrode 6 and the other end (termination) of the second internal electrode 7 are provided. And the input-side second external electrode 13 connected to the. At this time, the first external electrode 10 on the input side and the second external electrode 13 on the input side are disposed at a position near the side surface 2 </ b> C that is one side in the width direction of the core member 2. In addition, an output-side first external electrode 11 and an output-side second external electrode 12 are disposed at a position near the side surface 2D that is the other side in the width direction of the core member 2.

  That is, the input side of the power supply noise filter 1 is the side surface 2C side of the core member 2, and the output side is the side surface 2D side. Depending on device specifications, the input side of the power supply noise filter 1 may be the end surface 2A side of the core member 2, and the output side may be the end surface 2B side.

  The power supply noise filter 1 according to the present embodiment is configured as described above. Next, the operation thereof will be described.

  First, the power supply noise filter 1 is arranged on a substrate provided with a power supply line and a ground line, the power supply line is connected to the first external electrodes 10 and 11, and the ground line is connected to the second external electrodes 12 and 13. Connecting. As a result, the power supply voltage is supplied to the first internal electrode 6, and the second internal electrode 7 is held at the ground potential.

  Here, in a device using a high-frequency signal of, for example, 100 MHz or more such as a mobile phone or a mobile terminal, a high-frequency noise signal may be mixed into the power supply line or the ground line. At this time, the noise signal has a common mode in which signals in the same direction propagate to the power line and the ground line, and a differential mode (normal mode) in which signals in opposite directions propagate to the power line and the ground line. .

First, a case where a common mode signal propagates will be described. When a common mode signal propagates to the first and second internal electrodes 6 and 7, the direction of the current flowing through the first and second internal electrodes 6 and 7 is opposite to the opposite direction in the length direction of the core member 2. Become. That is, as shown in FIG. 5, the current i _CH in the first internal electrode 6 flows from the first external electrode 10 toward the first external electrode 11. That is, the current i _CH flows from the end surface 2A of the core member 2 toward the end surface 2B. The current i _CG in the second internal electrode 7 flows from the second external electrode 13 toward the second external electrode 12. That is, the current i _CG flows from the end surface 2B of the core member 2 toward the end surface 2A.

At this time, in the first and second co-directional parallel line portions 8A and 9A, the directions in which the currents i _CH and i _CG flow are opposite to the length direction. On the other hand, in the first and second reverse parallel line sections 8C and 9C, the currents i _CH and i _CG flow in the same direction with respect to the thickness direction. Therefore, the magnetic flux when the common mode signal propagates is as shown in FIG. 6, and the equivalent circuit is as shown in FIG.

As shown in FIG. 6, in the first and second co-directional parallel line portions 8A and 9A, the directions of the currents i _CH and i _CG are opposite to the length direction. Therefore, in the periphery of the first, second in the same direction parallel line portions 8A, 9A, the magnetic flux phi _CG1 created by the magnetic flux phi _CH1 and the current i _CG created by the current i _CH is a winding direction opposite the direction of each other . That is, the magnetic fluxes φ _CH1 and φ _CG1 wound together around the first and second same-direction parallel line portions 8A and 9A weaken each other. On the other hand, in the first and second reverse parallel line portions 8C and 9C, the directions of the currents i _CH and i _CG are the same as the thickness direction. Therefore, in the periphery of the first, second reverse parallel line portions 8C, 9C, the magnetic flux phi _CG2 created by the magnetic flux phi _CH2 and the current i _CG created by the current i _CH is also the same direction winding direction of each other . That is, the magnetic fluxes φ _CH2 and φ _CG2 wound together around the first and second reverse parallel line portions 8C and 9C are strengthened together.

As shown in FIG. 7, in the power supply noise filter 1, absorption of the core member 2 made of a ferrite material or the like occurs, so that the first and second internal electrodes 6 and 7 have resistances R _CH and R _CG . Further, the first and second same-direction parallel line portions 8A and 9A have self-inductances L _CH1 and L _CG1 . Since the magnetic fluxes φ _CH1 and φ _CG1 in the first and second co-directional parallel line portions 8A and 9A weaken each other, negative coupling mutual induction occurs and the value of the mutual inductance M1 becomes negative. Similarly, the first and second reverse parallel line portions 8C and 9C have self-inductances L _CH2 and L _CG2 . Since the magnetic fluxes φ _CH2 and φ _CG2 in the first and second reverse parallel line portions 8C and 9C strengthen each other, mutual induction of positive coupling occurs, and the value of the mutual inductance M2 becomes positive.

  That is, the positive coupling and the negative coupling are reversed between the mutual induction generated in the first and second parallel parallel line portions 8A and 9A and the mutual induction generated in the first and second reverse parallel line portions 8C and 9C. Become a relationship.

Accordingly, when a common mode signal propagates in the power supply noise filter 1, currents i _CH and i _CG in the same direction flow in the first and second reverse parallel line portions 8C and 9C, and the magnetic fluxes φ _CH2 and φ _CG2 Strengthen each other. As a result, the combined inductance of the first and second internal electrodes 6 and 7 is increased by the mutual inductance M2 having a positive value, and the combined impedance (common mode impedance) is also increased.

Next, a case where a differential mode signal propagates will be described. When the differential mode signal propagates to the first and second internal electrodes 6 and 7, the direction of the current flowing through the first and second internal electrodes 6 and 7 is the same as the length direction of the core member 2. Become. That is, as shown in FIG. 8, the current i _DH in the first internal electrode 6 flows from the first external electrode 10 toward the first external electrode 11. That is, the current i _DH flows from the end surface 2A of the core member 2 toward the end surface 2B. The current i _DG in the second internal electrode 7 flows from the second external electrode 12 toward the second external electrode 13. That is, the current i _DG flows from the end surface 2A of the core member 2 toward the end surface 2B.

At this time, in the first and second co-directional parallel line portions 8A and 9A, the current i _DH and i _DG flow in the same direction with respect to the length direction. On the other hand, in the first and second reverse parallel line portions 8C and 9C, the directions in which the currents i _DH and i _DG flow are opposite to the thickness direction. Therefore, the magnetic flux when the differential mode signal propagates is as shown in FIG. 9, and the equivalent circuit is as shown in FIG.

As shown in FIG. 9, in the first and second co-directional parallel line portions 8A and 9A, the directions of the currents i _DH and i _DG are the same as the length direction. Therefore, the magnetic flux φ _{DH1 generated} by the current i _DH and the magnetic flux φ _{DG1 generated} by the current i _DG are in the same direction around the first and second co-directional parallel line portions 8A and 9A. . That is, the magnetic fluxes φ _DH1 and φ _DG1 wound together around the first and second same-direction parallel line portions 8A and 9A strengthen each other. On the other hand, in the first and second reverse parallel line sections 8C and 9C, the directions of the currents i _DH and i _DG are opposite to the thickness direction. Therefore, the directions of the magnetic flux φ _{DH2 generated by} the current i _DH and the magnetic flux φ _{DG2 generated by} the current i _DG are also reversed around the first and second reverse parallel line portions 8C, 9C. That is, the magnetic fluxes φ _DH2 and φ _DG2 wound together around the first and second reverse parallel line portions 8C and 9C are weakened.

As shown in FIG. 10, the first and second internal electrodes 6 and 7 have resistances R _DH and R _DG due to absorption of the core member 2. Further, the first and second same-direction parallel line portions 8A and 9A have self-inductances L _DH1 and L _DG1 . Since the magnetic fluxes φ _DH1 and φ _DG1 in the first and second co-directional parallel line portions 8A and 9A strengthen each other, mutual induction of positive coupling occurs, and the value of the mutual inductance M1 becomes positive. Similarly, the first and second reverse parallel line portions 8C and 9C have self-inductances L _DH2 and L _DG2 . Since the magnetic fluxes φ _DH2 and φ _DG2 in the first and second reverse parallel line portions 8C and 9C weaken each other, negative coupling mutual induction occurs, and the value of the mutual inductance M2 becomes negative.

  That is, the positive coupling and the negative coupling are reversed between the mutual induction generated in the first and second parallel parallel line portions 8A and 9A and the mutual induction generated in the first and second reverse parallel line portions 8C and 9C. Become a relationship.

Therefore, when a differential mode signal propagates in the power supply noise filter 1, currents i _DH and i _DG in the same direction flow in the first and second co-directional parallel line portions 8A and 9A, and magnetic fluxes φ _DH1 and φ _DG1. Strengthen each other. As a result, the combined inductance of the first and second internal electrodes 6 and 7 is increased due to the positive mutual inductance M1, and the combined impedance (differential mode impedance) is also increased.

  Further, since the power supply noise filter 1 does not have a spiral coil structure, the stray capacitance is small, and at the same time, magnetic saturation hardly occurs. For this reason, both the common mode impedance and the differential mode impedance can be increased even in a high frequency band of, for example, 100 MHz or more.

  In order to confirm the above effects, the frequency characteristics of the common mode impedance and the differential mode impedance were determined by simulation for the power supply noise filter 1 according to the first embodiment. The results are shown in FIG. 11 and FIG. 11 and 12 show the comparison between the common mode impedance and the differential mode using the existing wound common mode choke coil as Comparative Examples 1 and 2 for comparison with the results of the power supply noise filter 1 according to the first embodiment. The frequency characteristics of impedance are also shown.

  When executing the simulation, the length direction dimension L of the core member 2 is 3.5 mm, the width direction dimension W is 0.5 mm, and the thickness direction dimensions T of the magnetic layers 3 to 5 are each 0.1 mm. It was. The lengthwise dimension Le1 of the first and second same-direction parallel line portions 8A and 9A and the lengthwise dimension Le2 of the first and second intersecting portions 8B and 9B are both 0.5 mm. Further, the width direction dimension We of the first and second internal electrodes 6 and 7 is set to 0.1 mm.

  Further, Comparative Example 1 was selected to have a high common mode impedance at the standard value of 100 MHz, and Comparative Example 2 was selected to increase the common mode impedance to a band of 100 MHz or higher.

  As shown in FIGS. 11 and 12, the common mode choke coils of Comparative Examples 1 and 2 have a structure in which a pair of wires are wound around a core made of a magnetic material, so that the common mode impedance becomes high near 100 MHz. However, in a relatively high frequency band such as a communication band (for example, 800-1000 MHz, 1800-2200 MHz, 2400-2500 MHz, etc.), the common mode impedance decreases due to the influence of magnetic saturation or the like. In the common mode choke coil, the inductance decreases with respect to the differential mode signal, so that the differential mode impedance has a low value over the entire band.

  On the other hand, in the power supply noise filter 1 according to the first embodiment, the common mode impedance and the differential mode impedance both increase from 100 MHz to a high frequency of about 1 GHz. As described above, in the power supply noise filter 1, the saturation point of the impedance can be shifted to a high frequency side near 1 GHz, for example, as compared with Comparative Examples 1 and 2. For this reason, even when noise in the communication band is mixed into the power supply line or the like, the power supply noise filter 1 can attenuate such high-frequency noise.

  Thus, according to the first embodiment, both the common mode impedance and the differential mode impedance in the first and second internal electrodes 6 and 7 can be increased, so that the common mode noise conducted to the power supply line can be reduced. Both differential mode noises can be reduced. That is, the power supply noise filter 1 can reduce the common mode noise by canceling the noise current generated in the first and second internal electrodes 6 and 7, and the differential mode noise is absorbed by the core member 2 (ferrite material). Further, it can be reduced by the reflection of the inductance component generated in the first and second internal electrodes 6 and 7.

  Further, without using a spiral coil, the first and second same-direction parallel line portions 8A and 9A and the first and second reverse-direction parallel line portions 8C and 9C can be positively coupled to each other. Therefore, the width and thickness of the first and second internal electrodes 6 and 7 can be increased, and the current that can be supplied can be increased.

  The power supply noise filter 1 does not generate inductance by a spiral coil structure, but is located in the core member 2 and parallel to the parallel parallel line portions 8A and 9A in parallel. Inductance is generated by forming 8C and 9C. As a result, since the number of laminated magnetic layers 3 to 5 of the core member 2 can be reduced as compared with the case where a plurality of coils are laminated in the thickness direction, the power noise filter 1 can be reduced in height and price. realizable.

  Also, the length in the length direction of the first and second same-direction parallel line portions 8A and 9A is formed longer than the dimension in the thickness direction of the first and second reverse-direction parallel line portions 8C and 9C. Yes. Thus, the positive coupling mutual inductance M2 generated between the first and second in-parallel parallel line sections 8A and 9A rather than the positive coupling mutual inductance M2 generated between the first and second reverse parallel line sections 8C and 9C. The inductance M1 is higher. For this reason, one of the common mode impedance and the differential mode impedance can be increased.

Further, when a current is supplied from the power supply through the power supply line, differential mode currents i _DH and i _DG flow through the first and second internal electrodes 6 and 7. At this time, in the differential mode, reverse currents i _DH and i _DG flow in the first and second reverse parallel line portions 8C and 9C, and the same current flows in the first and second same parallel line portions 8A and 9A. Directional currents i _DH and i _DG flow. Therefore, in the differential mode, a current suppressing effect is generated between the first and second reverse parallel line portions 8C and 9C due to the interaction between the magnetic field and the current, whereas the first and second same direction parallel lines are generated. Between the portions 8A and 9A, the current suppression effect is reduced by the interaction between the magnetic field and the current. On the other hand, in the common mode, a current suppression effect is generated between the first and second parallel parallel line portions 8A and 9A, whereas a current suppression effect is generated between the first and second reverse parallel line portions 8C and 9C. Becomes smaller.

However, the length direction dimension Le1 of the first and second same-direction parallel line portions 8A and 9A is longer than the thickness direction dimension of the first and second reverse-direction parallel line portions 8C and 9C. Yes. For this reason, in the differential mode including the current supply, the current suppression effect generated in the first and second reverse parallel line portions 8C and 9C is the first and second same direction parallel line portions 8A and 9A in the common mode. This is smaller than the current suppression effect produced in As a result, by supplying the currents i _DH and i _DG in the same direction to the first and second co-directional parallel line portions 8A and 9A in the differential mode, the current that can be supplied to the power supply line can be increased.

  In the power supply noise filter 1, the first and second external electrodes 10 and 13 on the input side are formed on the side surface 2 </ b> C side in the width direction of the core member 2, and the side surface 2 </ b> D side in the width direction of the core member 2 is formed. Are formed with first and second external electrodes 11 and 12 on the output side. For this reason, the power supply noise filter 1 is provided by arranging the power supply line and ground line on the input side on the side surface 2C side of the core member 2 and arranging the power supply line and ground line on the output side on the side surface 2D side of the core member 2. Can be easily connected between the power line on the input side and the output side.

  Further, for example, Japanese Patent Application Laid-Open No. 2006-186137 discloses a common mode filter provided with a conductor pattern on a core member formed by laminating magnetic layers and having two internal electrodes spiraling in the length direction. ing.

  However, in such a known common mode filter, in order to increase the inductance due to the common mode signal, the two internal electrodes propagate the common mode signal in the same direction at the portion where they are closest to each other, and in the opposite direction. A differential mode signal propagates. This point does not change over the entire length of the two internal electrodes. That is, in the known common mode filter, like the power supply noise filter 1 according to the first embodiment, the first and second parallel parallel line portions 8A and 9A and the first and second reverse parallel lines are provided. It does not include the sections 8C and 9C. For this reason, in the known common mode filter, only common mode noise can be reduced, and the effect of reducing noise in both common mode and differential mode as in the present invention cannot be obtained.

  In addition, since the known common mode filter has a spiral coil structure, stray capacitance is likely to occur, and at the same time, magnetic saturation is likely to occur, so that the impedance cannot be increased on the high frequency side. There is also a problem.

  Moreover, in the power supply noise filter 1 according to the present invention, the inductance is not generated by the spiral coil structure, but the number of turns per length direction (for example, 1.5 turns or less per 3.5 mm) is small, and the core member In this configuration, parallel internal electrodes 6 and 7 are formed inside 2. For this reason, in the power supply noise filter 1, the stray capacitance is reduced, the inductance is small, and magnetic saturation is unlikely to occur. As a result, in the power supply noise filter 1, the resonance frequency can be shifted to the high frequency side, and the impedance on the high frequency side can be increased.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, a recess is provided in the core member, and a power supply noise filter is attached to the upper surface of the USB connector substrate. Note that in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

The USB connector 21 according to the second embodiment includes a power supply voltage terminal V _BUS to which a power supply voltage is supplied, a pair of differential signal terminals D + and D− to which a differential signal is supplied, and a ground terminal connected to the ground. A substrate 22 provided with GND is provided. The board | substrate 22 is formed in flat form, for example with the insulating resin material. Further, the power supply voltage terminal V _BUS , the differential signal terminals D + and D−, and the ground terminal GND are all formed of a conductive metal material or the like. At this time, the upper surface of the substrate 22 is a terminal mounting surface, and on this upper surface, the power supply voltage terminal V _BUS , the differential signal terminals D +, D−, and the ground terminal GND are arranged in the length direction. For this reason, a pair of differential signal terminals D + and D- are arranged between the power supply voltage terminal _VBUS and the ground terminal GND.

  A power supply noise filter 23 is attached to the upper surface of the substrate 22 in a state of straddling the differential signal terminals D + and D− in the length direction. For example, the power supply noise filter 23 is resin-molded together with the substrate 22 and accommodated in a resin case 25. The power supply noise filter 23 is configured in substantially the same manner as the power supply noise filter 1 according to the first embodiment. For this reason, the power supply noise filter 23 includes the core member 2, first and second internal electrodes 6 and 7, first external electrodes 10 and 11, second external electrodes 12 and 13, and the like.

  However, in the middle of the length direction of the core member 2, two recesses 24 are provided on the lower surface side of the magnetic layer 5 to avoid contact with other signal lines. The recess 24 is formed, for example, by cutting out the lower end side of the core member 2 into a rectangular shape. When the power supply noise filter 23 is attached to the substrate 22, these recesses 24 are arranged at positions corresponding to the differential signal terminals D + and D- serving as signal lines. Thus, the recess 24 avoids the differential signal terminals D + and D− from coming into contact with the core member 2.

  The core member 2 does not necessarily need to be provided with the two recesses 24. For example, the core member 2 may be configured to have one recess in which the two recesses 24 are continuous. In this case, the contact between the pair of differential signal terminals D + and D− and the core member 2 may be avoided by one recess.

The first external electrode 10 is connected to the power supply voltage terminal _VBUS on the input side. An output side power supply voltage electrode 26 is connected to the first external electrode 11. An input-side ground terminal GND is connected to the second external electrode 13. An output-side ground electrode 27 is connected to the second external electrode 12.

  Thus, according to the second embodiment, common mode noise and differential mode noise can be reduced in the power line of the USB connector 21. Further, since the core member 2 is provided with the recess 24 in the middle of the length direction, the recess 24 can avoid contact between the core member 2 and the differential signal terminals D + and D-. For this reason, it can suppress that the attenuation effect of the core member 2 arises in the signal of differential signal terminal D +, D-. Further, since there is no need to route the differential signal terminals D + and D− to avoid the core member 2, the power supply noise filter 23 can be easily attached.

  Next, a third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, a power supply noise filter is attached to the lower surface of the USB connector substrate. In the third embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

The USB connector 31 according to the third embodiment includes a substrate 32 provided with a power supply voltage terminal V _BUS , differential signal terminals D + and D−, and a ground terminal GND. The substrate 32 is made of, for example, an insulating resin material. The lower surface of the substrate 32 is the surface opposite to the mounting surface of the terminals, and the power supply noise filter 1 according to the first embodiment is attached to this lower surface. The power supply noise filter 1 is fixed to the lower surface of the substrate 32 by a joining means such as soldering, and is accommodated together with the substrate 32 in, for example, a resin case 34.

The power supply voltage terminal V _BUS , the differential signal terminals D + and D−, and the ground terminal GND are provided on the upper surface of the substrate 32. The power supply voltage terminal V _BUS is connected to the first external electrode 10 through a via 33 that penetrates the substrate 32. The ground terminal GND is connected to the second external electrode 13 via a via 33 that penetrates the substrate 32.

Thus, in the third embodiment, substantially the same operational effects as in the second embodiment can be obtained. Further, in the third embodiment, the power supply noise filter 1 is provided on the lower surface of the substrate 32 where the power supply voltage terminal V _BUS , the differential signal terminals D + and D−, and the ground terminal GND are not provided. For this reason, contact between the core member 2 and the differential signal terminals D + and D− can be avoided by the substrate 32, so that it is not necessary to form a recess in the core member as in the second embodiment.

  In the first embodiment, the first and second inner electrodes 6 and 7 are formed of the first and second same-direction parallel line portions 8A and 9A and the first and second intersecting portions 8B and 9B. The first and second spiral patterns 8 and 9 including the first and second reverse parallel line portions 8C and 9C are provided. However, the present invention is not limited to this. For example, a power supply noise filter 41 according to a modification shown in FIG. 20 may be configured to omit the first and second intersections. That is, in the modification, the first internal electrode 42 is configured to reciprocate in the width direction by alternately connecting the first in-parallel parallel line portions 44 and the first reverse parallel line portions 46. . The second internal electrode 43 is configured to reciprocate in the width direction by alternately connecting the second in-parallel parallel line section 45 and the second reverse parallel line section 47. At this time, the first internal electrode 42 is disposed on the upper side in the thickness direction of the core member 2 over the entire length, and the second internal electrode 43 is disposed on the lower side in the thickness direction of the core member 2 over the entire length. Is arranged.

  Even in the power supply noise filter 41 configured as described above, when a common mode or differential mode signal propagates to the first and second internal electrodes 42 and 43, the first and second co-directional parallel line portions 44, The mutual induction generated in 45 and the mutual induction generated in the first and second reverse parallel line portions 46 and 47 can be configured such that the positive coupling and the negative coupling are opposite to each other. In addition, although the case where the first and second internal electrodes 42 and 43 of the modification are formed in a shape reciprocating in the width direction is illustrated, it may be formed in a shape reciprocating in the thickness direction. Further, the first and second reverse parallel line portions 46 and 47 are not limited to straight lines, and may be curved.

  In each of the above embodiments, the power supply voltage is connected to the first internal electrode 6 and the ground is connected to the second internal electrode 7. However, the present invention is not limited to this, and the first internal electrode 6 may be connected to the ground and the second internal electrode 7 may be connected to the power supply voltage.

1, 23 Power supply noise filter 2 Core member 6, 42 First internal electrode 7, 43 Second internal electrode 8 First spiral pattern 8A, 44 First same direction parallel line portion 8B First crossing portion 8C 46 First reverse parallel line section 9 Second spiral pattern 9A, 45 Second parallel parallel line section 9B Second crossing section 9C, 47 Second reverse parallel line section 10, 11 First External electrode 12, 13 Second external electrode 21, 31 USB connector 24 Recessed portion V _BUS power supply voltage terminal D +, D- Differential signal terminal GND Ground terminal

Claims (6)

A core member made of a magnetic material;
First and second internal electrodes provided inside the core member and supplied with a power supply voltage on one side and connected to the ground on the other;
A power supply noise filter comprising first and second external electrodes provided at end portions of the core member and connected to the first and second internal electrodes, respectively;
The first and second internal electrodes are connected in series by connecting in series a plurality of first and second spiral patterns that rotate halfway while moving from one end to the other end in the length direction, and whose positions are interchanged. Formed into a double helix,
The first and second spiral patterns are:
First and second parallel-direction line portions extending in parallel in the same direction toward the length direction and arranged in different positions in the thickness direction and the width direction of the core member,
First and second intersecting portions that are connected to ends of the first and second same-direction parallel line portions and extend in directions opposite to each other in the width direction of the core member;
The first and second reverse parallel line portions connected to the ends of the first and second intersecting portions and extending in parallel in opposite directions toward the thickness direction of the core member,
When a common mode or differential mode signal propagates to the first and second internal electrodes, the mutual induction generated in the first and second co-directional parallel line sections and the first and second reverse parallel signals A noise filter for power supply, wherein a positive coupling and a negative coupling are opposite to each other in mutual induction generated in the line portion.   The dimension of the length direction of the said 1st, 2nd same direction parallel line part is formed longer than the dimension of the thickness direction of the said 1st, 2nd reverse direction parallel line part. Noise filter for power supply. The one end of the core member in the length direction has the first external electrode on the input side connected to one end of the first internal electrode, and the output side connected to one end of the second internal electrode. The second external electrode is disposed;
The other end of the core member in the length direction is connected to the first external electrode on the output side connected to the other end of the first internal electrode and the other end of the second internal electrode. The second external electrode on the input side is disposed;
On one side in the width direction of the core member, the first external electrode on the input side and the second external electrode on the input side are arranged,
The power supply noise according to claim 1, wherein the first external electrode on the output side and the second external electrode on the output side are arranged on the other side in the width direction of the core member. filter.   The power supply noise filter according to claim 1, 2 or 3, wherein a concave portion for avoiding contact with another signal line is formed at an intermediate position in the length direction of the core member. A core member made of a magnetic material;
First and second internal electrodes provided inside the core member and supplied with a power supply voltage on one side and connected to the ground on the other;
A power supply noise filter comprising first and second external electrodes provided at end portions of the core member and connected to the first and second internal electrodes, respectively;
The first and second internal electrodes are arranged at different positions in the thickness direction and the width direction of the core member, and extend in parallel in the same direction with respect to the length direction. And first and second reverse parallel line sections extending in parallel in opposite directions with respect to the thickness direction or width direction of the core member, and the first and second parallel parallel line sections And the first and second reverse parallel line sections are alternately connected,
When a common mode or differential mode signal propagates to the first and second internal electrodes, the mutual induction generated in the first and second co-directional parallel line sections and the first and second reverse parallel signals A noise filter for power supply, wherein a positive coupling and a negative coupling are opposite to each other in mutual induction generated in the line portion. A USB connector comprising the power supply noise filter according to any one of claims 1 to 5,
A power supply voltage terminal to which a power supply voltage is supplied, a pair of differential signal terminals to which a differential signal is supplied, and a ground terminal connected to the ground,
A USB connector in which the first external electrode is connected to the power supply voltage terminal, and the second external electrode is connected to the ground terminal.

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