JP3855661B2 - Line filter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a line filter used for various consumer devices.
[0002]
[Prior art]
Hereinafter, a conventional line filter will be described with reference to the drawings.
[0003]
FIG. 7 is an exploded perspective view of a conventional line filter, and FIG. 8 is a perspective view of the line filter.
[0004]
7 and 8, the conventional line filter has a through-hole 1 in the axial direction and a bobbin 3 having a plurality of flanges 2, and a winding 4 wound between the flanges 2 of the bobbin 3, The winding 4 is connected, and a terminal 5 implanted in the bobbin 3 and a closed magnetic path magnetic core 6 formed by combining two U-shaped magnetic cores are inserted into the through hole 1 of the bobbin 3. ing.
[0005]
Further, a concave portion 7 in which the closed magnetic path magnetic core 6 is disposed is provided on the lower surface portion of the bobbin 3, and the closed magnetic path magnetic core 6 is provided in the concave portion 7 through an insulating plate 8.
[0006]
Further, the closed magnetic path magnetic core 6 is sandwiched by a U-shaped metal plate 10 so that the combined butted surfaces 9 are not separated.
[0007]
Then, the bobbin 3, the closed magnetic path magnetic core 6, the insulating plate 8, the winding 4 and the like are fixed by impregnating with varnish.
[0008]
[Problems to be solved by the invention]
Generally, the line filter having the above-described configuration is used in a charging device for an AC power source (commercial power) of an information terminal device, and is used for noise removal during use of the charging device.
[0009]
In the above conventional configuration, since the closed magnetic path magnetic core is arranged in the vertical direction, it is not possible to reduce the size in the height direction, and when the line filter is mounted on the mounting board, the wiring pattern of the mounting board and the closed magnetic path magnet A short circuit is likely to occur due to the proximity of the core 6, and there is a problem that accurate noise removal cannot be performed.
[0010]
The present invention solves the above-mentioned problems, and provides a line filter capable of accurately removing noise by preventing downsizing in the height direction and short circuit when used in a charging device of an information terminal device. The purpose is that.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration.
[0012]
According to the first aspect of the present invention, a bobbin having a through hole, a winding wound around the bobbin, a closed magnetic path magnetic core inserted into the through hole, and an inner surface of the closed magnetic path magnetic core And an insulating plate disposed between the bobbin and an outer peripheral surface of the bobbin. The bobbin has a protrusion disposed at a lower portion of the bobbin and on which the closed magnetic path magnetic core is placed, and an upper surface of the protrusion. And a taper wall portion having a taper portion from the outer peripheral surface of the bobbin toward the outside, and the width of the taper wall portion and the thickness of the insulating plate are substantially the same .
[0013]
With the above configuration, the insulating plate can be positioned in the lateral direction, and the distance between the closed magnetic path magnetic core and the winding can be maintained at a constant distance, and the closed magnetic path magnetic core can be positioned. In particular, when the insulating plate is not required depending on the state of use, even if the insulating plate is removed, the distance between the closed magnetic path magnetic core and the winding can be kept constant by the width of the taper wall portion. The minimum insulation distance can be secured and it is easy to use.
[0014]
Furthermore, since the closed magnetic path magnetic core is placed on the bobbin protruding portion so as to be horizontal, the wiring pattern of the mounting board and the closed magnetic path magnetic core are prone to be close to each other, and a short circuit is likely to occur. Can be removed.
[0015]
In addition, when the closed magnetic path magnetic core is placed horizontally on the protruding portion of the bobbin, the winding wound around the bobbin and the closed magnetic path magnetic core are close to each other, and a short circuit is likely to occur. An insulating plate is placed between the inner surface of the core and the outer peripheral surface of the bobbin, so that the insulation between the closed magnetic circuit core and the winding can be accurately achieved, and the height direction is reduced without increasing the lateral direction. Can be
[0016]
Further, in particular, the closed magnetic path magnetic core is formed by combining two E-shaped magnetic cores, and the protruding portions are provided so as to protrude from the flange portion of the bobbin by the same size as each other, and the protruding portions are formed along the outer peripheral surface of the bobbin. The insulating plate has an L-shaped cross section with an L-shaped portion, the L-shaped portion is disposed in the recessed portion, and the L-shaped portion is opposed to the lower surface of the closed magnetic path magnetic core. The structure is locked.
[0017]
Furthermore, when a closed magnetic path magnetic core is formed by combining two E-shaped magnetic cores, the winding and the closed magnetic path magnetic core are close to each other through an insulating plate, but the insulating plate has an L-shaped cross section. The L-shaped portion is disposed in the recess, and the L-shaped portion of the insulating plate is engaged with the lower surface of the closed magnetic circuit core so as to be locked, so that the insulation distance between the winding and the closed magnetic circuit core Can be made longer by the length of the L-shaped portion of the insulating plate, and accurate insulation can be achieved.
[0018]
Further, since the L-shaped portion of the insulating plate is engaged with the lower surface of the closed magnetic circuit core so as to be locked, the insulating plate does not fall off .
[0019]
Further , the closed magnetic path magnetic core is formed by combining two U-shaped magnetic cores, and the protruding portion is provided so as to protrude only in one direction from the flange portion of the bobbin, and the upper surface of the protruding portion along the outer peripheral surface of the bobbin. The insulating plate was formed in an I-shaped cross section, and the tip of the insulating plate was inserted into the groove .
[0020]
With the above configuration, when a closed magnetic path magnetic core is formed by combining two U-shaped magnetic cores, the winding and the closed magnetic path magnetic core are close to each other via an insulating plate. Since it protrudes only in one side direction, the protrusion length of the protrusion can be increased even with the same bobbin width as compared with the case where the protrusion protrudes in both directions. In other words, if the terminal is planted at the end of the protruding portion having a longer protruding length, the distance between the groove and the terminal can be increased even if the depth of the groove is increased, and the vicinity of the protruding portion of the groove. There is no loss of strength. Without impairing the bobbin strength, it is possible to accurately insulate the closed magnetic path magnetic core and the winding by the insulating plate .
[0021]
Further, the insulating plate was provided with a protruding portion that protruded to the lower surface side of the closed magnetic path magnetic core .
[0022]
With the above configuration, since the protruding portion of the insulating plate protrudes to the lower surface side of the closed magnetic path magnetic core, the insulating plate is supported by the closed magnetic path magnetic core and does not fall off.
[0023]
Furthermore, the closed magnetic path magnetic core is formed by combining two U-shaped magnetic cores or E-shaped magnetic cores, and the abutting surface of the closed magnetic path magnetic core is disposed at a position facing the flange of the bobbin. An adhesive is integrally applied and bonded to the butting surface of the path magnetic core and the insulating plate and the flange, and the outer periphery of the closed magnetic path magnetic core is wound and bonded with an insulating tape, and the closed magnetic path magnetic core is The insulating tape was wound and adhered to the outer periphery of the protruding portion disposed above .
[0024]
With the above configuration, since individual parts such as bobbins are not impregnated and impregnated with varnish, the distributed capacity due to the varnish is not generated between the windings, and the attenuation characteristics are not deteriorated. Especially, a high frequency of about 500 kHz to several tens of MHz. Band attenuation characteristics can be improved and noise can be removed accurately.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
Hereinafter, claims 1 to 3 and 7 of the present invention will be described using the first embodiment with reference to the drawings.
[0026]
1 is an exploded perspective view of a line filter according to Embodiment 1 of the present invention, FIG. 2 is a perspective view of the line filter, and FIG. 3 is a cross-sectional view of the line filter.
[0027]
1 to 3, the line filter according to the first embodiment of the present invention has a through hole 21 in the axial direction and a bobbin 23 having a plurality of flanges 22, and is wound between the flanges 22 of the bobbin 23. In addition to connecting the winding 24, the winding 24 is connected to a terminal 25 implanted in the bobbin 23, and a closed magnetic circuit core 26 inserted into the through hole 21 of the bobbin 23.
[0028]
A bobbin 23 is provided at its lower portion with a protruding portion 30 in which a part of the bobbin 23 protrudes in the horizontal direction except for a portion facing the winding 24, and a closed magnetic circuit core 26 is provided on the protruding portion 30. And an insulating plate 28 is disposed between the inner surface of the closed magnetic path magnetic core 26 and the outer peripheral surface of the bobbin 23.
[0029]
Further, the closed magnetic path magnetic core 26 is formed by combining two E-shaped magnetic cores, and the protruding portions 30 are provided so as to protrude from the flanges 22 of the bobbin 23 by the same size, and protrude along the outer peripheral surface of the bobbin 23. A concave portion 31 is provided on the upper surface of the portion 30, and the insulating plate 28 has an L-shaped cross section having an L-shaped portion 32, the L-shaped portion 32 is disposed in the concave portion 31, and the L-shaped portion 32 is disposed in the closed magnetic circuit core 26. It is locked so as to face the lower surface. In particular, a tapered wall portion 33 having a tapered portion is provided on the inner side walls at both ends of the recess 31 from the outer peripheral surface of the bobbin 23 to the outside, and the width (W1) of the tapered wall portion 33 is set to an insulating plate. The thickness (W2) of 28 is substantially the same.
[0030]
Then, the abutting surface 29 of the E-shaped magnetic core forming the closed magnetic path magnetic core 26 is arranged at a position facing the flange 22 of the bobbin 23, and the abutting surface 29 of the E-shaped magnetic core, the insulating plate 28, and the flange 22 In addition, the adhesive 34 is applied and bonded together, and the outer periphery of the closed magnetic path magnetic core 26 is wound and bonded with the insulating tape 35, and the outer periphery of the protrusion 30 that places the closed magnetic path magnetic core 26 on the upper side is also provided. The insulating tape 35 is wound and bonded.
[0031]
With the above configuration, since the closed magnetic path magnetic core 26 is placed on the protruding portion 30 of the bobbin 23 so as to be in the horizontal direction, the wiring pattern of the mounting board and the closed magnetic path magnetic core 26 are close to each other to cause a short circuit. It is possible to prevent the noise from being easily removed and to accurately remove noise.
[0032]
Further, when the closed magnetic path magnetic core 26 is placed in the horizontal direction on the protruding portion 30 of the bobbin 23, the winding 24 wound around the bobbin 23 and the closed magnetic path magnetic core 26 are close to each other so that a short circuit is easily caused. However, since the insulating plate 28 is disposed between the inner surface of the closed magnetic path magnetic core 26 and the outer peripheral surface of the bobbin 23, the insulation between the closed magnetic path magnetic core 28 and the winding 24 can be accurately achieved, and the lateral direction The height direction can be reduced without increasing the size.
[0033]
Furthermore, when the closed magnetic path magnetic core 26 is formed by combining two E-shaped magnetic cores, the winding 24 and the closed magnetic path magnetic core 26 are close to each other through the insulating plate 28. However, the insulating plate 28 has an L-shaped portion. Since the L-shaped portion 32 is disposed in the recess 31 and the L-shaped portion 32 of the insulating plate 28 is opposed to the lower surface of the closed magnetic path magnetic core 26 and locked. The insulation distance between the wire 24 and the closed magnetic path magnetic core 26 can be increased by the L-shaped portion 32 of the insulating plate 28, and accurate insulation can be achieved. At this time, since the L-shaped portion 32 of the insulating plate 28 is engaged with the lower surface of the closed magnetic path magnetic core 26 and locked, the insulating plate 28 does not fall off.
[0034]
A taper wall portion 33 having a taper portion is provided on the inner side walls at both ends of the recess 31 from the outer peripheral surface of the bobbin 23, and the width (W 1) of the taper wall portion 33 is set to the insulating plate 28. Since the thickness is substantially the same as the thickness (W2), the insulating plate 28 can be positioned in the lateral direction, and the distance between the closed magnetic path magnetic core 26 and the winding 24 can be kept at a constant distance. 26 positionings can be made. In particular, when the insulating plate 28 is not required depending on the use state, the distance between the closed magnetic path magnetic core 26 and the winding 24 is kept constant by the width of the tapered wall portion 33 even if the insulating plate 28 is removed. Therefore, the minimum insulation distance can be secured and it is easy to use.
[0035]
In addition, since individual parts such as the bobbin 23 are not impregnated with the varnish, the distributed capacity due to the varnish is not generated between the windings 24 and the attenuation characteristics are not deteriorated. The attenuation characteristic of the frequency band can be improved and accurate noise removal can be performed.
[0036]
In particular, the outer periphery of the closed magnetic path magnetic core 26 is wound and bonded with the insulating tape 35, and the insulating tape 35 is also wound and bonded to the outer periphery of the projecting portion 30 where the closed magnetic path magnetic core 26 is disposed above. And the like are added to the closed magnetic path magnetic core 26, and even if a crack or the like occurs in the closed magnetic path magnetic core 26, the closed magnetic path magnetic core 26 can be prevented from being chipped and scattered.
[0037]
As described above, according to the first embodiment of the present invention, the wiring pattern of the mounting board and the closed magnetic path magnetic core 26 are close to each other, so that a short circuit is likely to occur. Insulation between the core 26 and the winding 24 can be accurately achieved, and the height direction can be reduced without increasing the lateral direction. In particular, even when the closed magnetic path magnetic core 26 is formed by combining two E-shaped magnetic cores, the above effect can be obtained.
[0038]
(Embodiment 2)
Hereinafter, claims 1, 4 to 6 and 7 of the present invention will be described with reference to the drawings using the second embodiment.
[0039]
4 is an exploded perspective view of the line filter according to Embodiment 2 of the present invention, FIG. 5 is a perspective view of the line filter, and FIG. 6 is a sectional view of the line filter.
[0040]
The line filter according to the second embodiment of the present invention is an improvement of the line filter according to the first embodiment.
[0041]
4 to 6, the line filter according to the second embodiment of the present invention has a through hole 21 in the axial direction and a bobbin 23 having a plurality of flanges 22, and is wound between the flanges 22 of the bobbin 23. In addition to connecting the winding 24, the winding 24 is connected to a terminal 25 implanted in the bobbin 23, and a closed magnetic circuit core 26 inserted into the through hole 21 of the bobbin 23.
[0042]
Further, the bobbin 23 is provided with a protruding portion 30 in which a part of the bobbin 23 protrudes in the horizontal direction except for a portion facing the winding 24, and the closed magnetic path magnetic core 26 is set in the horizontal direction. The insulating plate 28 is disposed between the inner surface of the closed magnetic path magnetic core 26 and the outer peripheral surface of the bobbin 23. At this time, the insulating plate 28 is provided with protrusions 37 protruding from the upper surface side and the lower surface side of the closed magnetic path magnetic core 26. The protruding portion 37 protruding to the lower surface side of the closed magnetic path magnetic core 26 is disposed at a portion facing the winding 24.
[0043]
Further, the closed magnetic path magnetic core 26 is formed by combining two U-shaped magnetic cores, and the protruding portion 30 is provided so as to protrude only in one direction from the flange 22 of the bobbin 23 and protrudes along the outer peripheral surface of the bobbin 23. A groove portion 36 is provided on the upper surface of the portion 30, the insulating plate 28 has an I-shaped cross section, and the distal end portion of the insulating plate 28 is inserted into the groove portion 36. In particular, a taper wall portion 33 having a taper portion is provided on the inner side walls at both ends of the groove portion 36 from the outer peripheral surface of the bobbin 23 to the outside, and the width (W1) of the taper wall portion 33 is set to the insulating plate 28. The thickness (W2) is substantially the same.
[0044]
Then, the U-shaped magnetic core butting surface 29 forming the closed magnetic path magnetic core 26 is disposed at a position facing the flange 22 of the bobbin 23, and an adhesive 34 is applied to the flange 22 to apply the U-shaped magnetic core. And the outer periphery of the closed magnetic path magnetic core 26 are wound and bonded with the insulating tape 35, and the closed magnetic path magnetic core 26 is also insulated from the outer periphery of the protruding portion 30 disposed above. The tape 35 is wound and bonded.
[0045]
With the above configuration, since the closed magnetic path magnetic core 26 is placed on the protruding portion 30 of the bobbin 23 so as to be in the horizontal direction, the wiring pattern of the mounting board and the closed magnetic path magnetic core 26 are close to each other to cause a short circuit. It is possible to prevent the noise from being easily removed and to accurately remove noise.
[0046]
Further, when the closed magnetic path magnetic core 26 is placed in the horizontal direction on the projecting portion 30 of the bobbin 23, the winding 24 wound around the bobbin 23 and the closed magnetic path magnetic core 26 are close to each other and are easily short-circuited. However, since the insulating plate 28 is disposed between the inner surface of the closed magnetic path magnetic core 26 and the outer peripheral surface of the bobbin 23, the insulation between the closed magnetic path magnetic core 26 and the winding can be accurately achieved, and the lateral direction can be adjusted. The height direction can be reduced without increasing the size.
[0047]
Further, when the closed magnetic path magnetic core 26 is formed by combining two U-shaped magnetic cores, the winding 24 and the closed magnetic path magnetic core 26 are close to each other through the insulating plate 28, but the protruding portion 30 has the bobbin 23. Since the protrusion 22 protrudes only in one side direction, the protrusion length of the protrusion 30 can be increased even with the same width of the bobbin 23 as compared with the case where the protrusion 30 protrudes in both directions. That is, if the terminal 25 is implanted at the end of the protruding portion 30 having a longer protruding length, the distance between the groove portion 36 and the terminal 25 can be increased even if the depth of the groove portion 36 is increased. The strength of the protruding portion 30 in the vicinity of the groove portion 36 is not impaired. Without impairing the strength of the bobbin 23, the insulation between the closed magnetic path magnetic core 26 and the winding 24 by the insulating plate 28 can be accurately achieved. At this time, since the protruding portion 37 of the insulating plate 28 protrudes at least on the lower surface side of the closed magnetic path magnetic core 26, the protruding portion 37 of the insulating plate 28 is supported on the lower surface of the closed magnetic path magnetic core 26, and the insulating plate 28. Will not fall off.
[0048]
A taper wall portion 33 having a taper portion is provided on the inner side walls at both ends of the groove portion 36 from the outer peripheral surface of the bobbin 23 to the outside, and the width (W1) of the taper wall portion 33 is set to the insulating plate 28. Since the thickness is substantially the same as the thickness (W2), the insulating plate 28 can be positioned in the lateral direction, and the distance between the closed magnetic path magnetic core 26 and the winding 24 can be kept at a constant distance. 26 positionings can be made. In particular, when the insulating plate 28 is not required depending on the use state, the interval between the closed magnetic path magnetic core 26 and the winding 24 is constant depending on the width (W1) of the tapered wall portion 33 even if the insulating plate 28 is removed. Since the distance can be maintained, the minimum insulation distance can be secured and it is easy to use.
[0049]
In addition, since individual parts such as the bobbin 23 are not impregnated with the varnish, the distributed capacity due to the varnish is not generated between the windings 24 and the attenuation characteristics are not deteriorated. The attenuation characteristic of the frequency band can be improved and accurate noise removal can be performed.
[0050]
In particular, the outer periphery of the closed magnetic path magnetic core 26 is wound and bonded with the insulating tape 35, and the insulating tape 35 is also wound and bonded to the outer periphery of the projecting portion 30 where the closed magnetic path magnetic core 26 is disposed above. And the like are added to the closed magnetic path magnetic core 26, and even if a crack or the like occurs in the closed magnetic path magnetic core 26, the closed magnetic path magnetic core 26 can be prevented from being chipped and scattered.
[0051]
As described above, according to the first embodiment of the present invention, the wiring pattern of the mounting substrate and the closed magnetic path magnetic core 26 are prevented from being close to each other and a short circuit is easily generated, and noise can be accurately removed. The insulation between the closed magnetic path magnetic core 26 and the winding 24 can be accurately achieved, and the height direction can be reduced without increasing the lateral direction. In particular, even when the closed magnetic path magnetic core 26 is formed by combining two U-shaped magnetic cores, the above effect can be obtained.
[0052]
【The invention's effect】
As described above, according to the present invention, since the closed magnetic path magnetic core is placed on the bobbin protruding portion so as to be horizontal, the wiring pattern of the mounting board and the closed magnetic path magnetic core are close to each other and short-circuited. Can be prevented, and noise can be accurately removed.
[0053]
In addition, when the closed magnetic path magnetic core is placed horizontally on the protruding portion of the bobbin, the winding wound around the bobbin and the closed magnetic path magnetic core are close to each other, and a short circuit easily occurs. An insulating plate is placed between the inner surface of the core and the outer peripheral surface of the bobbin, so the insulation between the closed magnetic circuit magnetic core and the winding can be accurately achieved, and the height direction can be reduced without increasing the lateral direction. Can be
[0054]
As a result, when used in a charging device of an information terminal device or the like, it is possible to provide a line filter capable of accurately removing noise by preventing miniaturization in the height direction and short circuit.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a line filter according to Embodiment 1 of the present invention. FIG. 2 is a perspective view of the line filter. FIG. 3 is a cross-sectional view of the line filter. FIG. 5 is a perspective view of the line filter. FIG. 6 is a sectional view of the line filter. FIG. 7 is an exploded perspective view of a conventional line filter. FIG. 8 is a perspective view of the line filter. Explanation of]
21 Through-hole 22 鍔 23 Bobbin 24 Winding 25 Terminal 26 Closed magnetic path magnetic core 28 Insulating plate 29 Abutting surface 30 Protruding portion 31 Recessed portion 32 L-shaped portion 33 Tapered wall portion 34 Adhesive 35 Insulating tape 36 Groove portion

Claims (5)

A bobbin having a through hole;
Winding wound around this bobbin,
A closed magnetic path core inserted in the through hole;
An insulating plate disposed between the inner surface of the closed magnetic path magnetic core and the outer peripheral surface of the bobbin;
The bobbin includes
A protrusion disposed at a lower portion of the bobbin and on which the closed magnetic path magnetic core is placed;
A taper wall portion having a taper portion is provided from the outer peripheral surface of the bobbin and disposed on the protruding portion,
A line filter in which the width of the tapered wall portion and the thickness of the insulating plate are substantially the same. A recess is provided on the upper surface of the protruding portion along the outer peripheral surface of the bobbin,
The line filter according to claim 1 , wherein the tapered wall portion is disposed on walls at both ends of the concave portion. The line filter according to claim 1 , wherein the closed magnetic path magnetic core is formed by combining two E-shaped magnetic cores, and the insulating plate is L-shaped. 2. The closed magnetic path magnetic core according to claim 1 , wherein the closed magnetic path magnetic core is formed by combining two U-shaped magnetic cores, and the insulating plate has an I-shape and has a protrusion protruding to the lower surface side of the closed magnetic path magnetic core. Line filter. The butted surface of the closed magnetic path magnetic core is disposed at a position facing the bobbin collar,
The butted surface of the closed magnetic path magnetic core, the insulating plate, and the flange are integrally bonded by an adhesive, and the outer periphery of the closed magnetic path magnetic core and the outer periphery of the protruding portion are wound and bonded with an insulating tape. Item 5. The line filter according to item 3 or item 4 .

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