JP5054667B2 - Line filter - Google Patents

Abstract

A circuit filter capable of improving insulation overpressure resistant through a simple structure comprises a winding tube (10) having a through hole (11) in the direction of the winding shaft and a plurality of flange parts, the first and second windings winding the flange parts of the winding tube (10), a magnetic core (20) of a closed magnetic circuit, a central magnetic foot (21) being inserted into the through hole (11) of the winding tube (10), and a terminal stand (40) supporting the winding tube (10) and the magnetic core (20) of the closed magnetic circuit and having terminals connected with the windings, wherein, the terminal stand (40) has an insulation wall (44) protruding between the periphery of the winding tube (10) and an external magnetic foot (22) of the magnetic core (20) of the closed magnetic circuit, and the insulation wall (44) has a protrusion bar (47) protruding between the flange parts of the winding tube (10).

Description

  The present invention relates to a line filter used for various electronic devices.

  As a conventional line filter, for example, as shown in FIG. 5, a sun-shaped closed magnetic circuit magnet having a bobbin 60 having a cylindrical through hole in the central shaft portion and a central magnetic leg inserted into the through hole of the bobbin 60 is used. A terminal block (not shown) having a core 62, one winding 63 wound between the flanges of the bobbin 60 and the other winding 64, and a rectangular frame portion that supports and fixes the bobbin 60 and the closed magnetic circuit core 62. And a terminal (not shown) connected to one winding 63 and the other winding 64 provided in a terminal block (Patent Document 1).

In this terminal block, an insulating wall 68 is provided between the bobbin 60 and the closed magnetic circuit core 62 so as to face the outer peripheral surface of the bobbin 60 around which the one winding 63 and the other winding 64 are wound. Yes. The insulating wall 68 is formed in a thin flat plate shape that insulates the winding wound between the flange portions of the bobbin 60 and the external magnetic leg of the closed magnetic path magnetic core 62.
Japanese Utility Model Publication No. 6-45321

  However, it cannot be said that the insulation wall of the conventional line filter has a sufficient insulation breakdown voltage, and there remains room for improvement in increasing the insulation breakdown voltage.

  Therefore, the present invention provides a line filter that can increase the withstand voltage with a simple structure.

The present invention, which has been made to achieve the above object,
A bobbin having a through hole in the winding axis direction and having a plurality of flanges;
One winding and the other winding wound between the flanges of the bobbin;
A sun-shaped closed magnetic circuit core having a central magnetic leg and an external magnetic leg to be inserted into the bobbin through hole;
A terminal block that supports the bobbin and the closed magnetic path magnetic core and has a terminal block to which a terminal of the winding is connected;
The terminal block has an insulating wall which projects into the gap between the outer periphery and the outer magnetic legs of said closed magnetic path core of the bobbin,
The insulating walls have a protruding portion protruding between the flange portion of the bobbin which the coil is wound,
The protruding portion is formed so as to be in non-contact in proximity to the outer periphery of the winding.
It is characterized by this.

In the line filter of the present invention, as a further preferable feature,
“The protruding portion of the insulating wall is continuous with at least a portion facing the closed magnetic path magnetic core”.
“The protruding portion of the insulating wall is integrally formed with the insulating wall.”
Is included.

  According to the present invention, the insulating space distance between the closed magnetic path magnetic core and the winding can be reduced with a simple configuration by providing the insulating wall with the protruding protrusion protruding in the space generated on the upper surface of the winding between the bobbin collars. The stretched insulation voltage can be increased, and the bending strength of the flat insulating wall protruding from the terminal block can be increased by providing the protrusion.

  Hereinafter, embodiments of the present invention will be exemplarily described based on the drawings. However, the material, shape, relative arrangement, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

  FIG. 1 is an exploded perspective view of a line filter according to an embodiment of the present invention. FIG. 2 is a completed perspective view of the line filter in FIG. 1 according to the present invention. 3 is a front view (a), a side view (b), and a cross-sectional view (c) in FIG. 2 of the present invention.

(First embodiment)
1 to 3, the line filter 1 according to the present embodiment includes a bobbin 10 having a cylindrical through hole 11 in a central shaft portion, a central magnetic leg 21 and an external magnetic leg 22 inserted into the through hole 11 of the bobbin 10. A closed-loop magnetic core 20 having a Japanese character shape, one winding 13 and the other winding 14 wound around the bobbin 10, and a terminal block 40 for supporting and fixing the bobbin 10 and the closed magnetic-path magnetic core 20. The terminal block 40 is provided with a terminal 51 connected to the one winding 13 and the other winding 14 so that common mode noise can be removed.

  The above-described bobbin 10 is made of a semi-cylindrical winding frame divided into two having a through hole 11, and a central magnetic leg 21 of a sun-shaped closed magnetic circuit core 20 is combined with the through hole 11. The bobbin 10 is provided with two outer flange portions 12 and an intermediate flange portion 15 that divides one winding 13 and the other winding 14 at substantially the center, and further includes one winding 13 and the other winding 14. Each of the split collars 16 is divided into two or more. The widths W1 between these flanges are formed to be substantially the same width. When the bobbin 10 is wound, the bobbin collar is not wound to the outer periphery in consideration of loosening of the bobbin 10, and a space is generated on the upper surface of the winding between the bobbin collars after winding.

  The terminal block 40 includes a substantially rectangular rectangular frame portion 43 having an opening 42 and a terminal plate portion 41 in which terminals 51 are implanted. The frame portion 43 is disposed at an end of the terminal plate portion 41 and is side-faced. It is substantially L-shaped.

  The terminal block 40 has a substantially horizontal thin flat plate shape that insulates one winding 13 and the other winding 14 wound around the bobbin 10 from the external magnetic leg 22 of the closed magnetic path core 20 surrounding the winding 13. Insulating wall 44 is provided. The insulating wall 44 is integrally formed with the terminal block 40 with an insulating resin and has a protrusion 47 protruding between the flanges of the wound bobbin 10.

The protrusion 47 protrudes into a space formed on the upper surface of the winding between the bobbin flanges because the winding is not wound up to the outer periphery of the bobbin flange considering winding loosening when the bobbin is wound.
When the protrusion 47 protrudes between the flanges of the bobbin, the insulation space distance D1 between the winding and the external magnetic leg 22 of the closed magnetic path magnetic core 20 is formed as shown in FIG. This insulation space distance D1 indicates the shortest distance that passes through the space from the upper end of the outer periphery of the winding to the end of the external magnetic leg of the closed magnetic path core through the peripheral wall of the insulating wall. In addition, the insulating space distance D2 indicates a case of a flat insulating wall in which the protrusion 47 is not provided on the insulating wall 44 shown in FIG. 3 (conventional).

  The insulation space distance D1 can be extended by providing the protrusion 47 as compared with the conventional case, and the line filter shown in FIG. 3 can improve the insulation space distance by about 7%. It works effectively in filters.

  The protrusion 47 of the insulating wall 44 is provided substantially in parallel with the direction of insertion into the gap between the closed magnetic path magnetic core 20 and the wound bobbin 10, and extends from the tip 48 of the insulating wall 44 to the frame portion 43. It is provided continuously up to the rear end 49, and the bending strength of the flat insulating wall 44 protruding from the terminal block 40 can be increased.

Therefore, with the ridges 47 can increase the dielectric breakdown voltage stretched insulation space distance between the between the closed magnetic circuit core 2 0 and windings with a simple structure by projecting between the flange portion of the bobbin, the terminal block 40 The bending strength of the thin flat-plate-like insulating wall 44 projecting from can be increased.

  Further, the protrusion 47 of the insulating wall 44 is formed so as to be continuous with at least a portion facing the external magnetic leg 22 of the closed magnetic path magnetic core 20, and withstand voltage between the closed magnetic path magnetic core 20 and the windings. Can be reliably increased.

  Further, the protrusion 47 of the insulating wall 44 is formed integrally with the insulating wall 44, so that a low-cost and highly reliable line filter can be realized without increasing the number of members of the terminal block 40 and the number of assembly steps.

  The width W2 of the protrusion 47 of the insulating wall 44 is formed to be substantially the same as or slightly smaller than the width W1 between the bobbin collars. When the width W2 of the protrusion 47 is formed to be substantially the same as the width W1 between the bobbin collars, the movement of the bobbin in the winding axis direction can be restricted.

  Further, the protrusion 47 of the insulating wall 44 is formed between the flanges of the bobbin 10 so as to be close to the outer periphery of the winding and in non-contact, and is insulated between the closed magnetic circuit core 20 and the wound bobbin 10. The wall 44 can be inserted without touching the winding and can be easily assembled.

  The above-described insulating wall 44 has an upper side 45 and a lower side 46 protruding in parallel with the horizontal direction from the frame portion 43 of the terminal block 40, and is positioned when the bobbin 10 is provided on the terminal block 40 on the insulating wall 44. A guide portion 44b is provided. The insulating wall 44 is positioned when the terminal block 40 supports the closed magnetic circuit core 20.

  A method of assembling the line filter 1 having such a configuration will be described below with reference to FIGS.

  1 to 3, the center magnetic leg 21 of the sun-shaped closed magnetic circuit core 20 is inserted into the through hole of the half-cylindrical winding frame divided into two, and the bobbin 10 is combined. The bobbin 10 has a gear on one side of the outer flange portion 12 and applies a rotational force to the gear 19 using an external force to rotate around the central magnetic leg 21 to rotate one winding 13 and the other. The winding 14 is wound around the bobbin 10.

  Next, the closed magnetic path magnetic core 20 is arranged vertically so that one end surface of the closed magnetic path magnetic core 20 is in contact with the outer peripheral surface of the frame portion 43 of the terminal block 40. Then, a part of the bobbin 10 is inserted into the opening 42 of the frame portion 43, and the insulating wall 44 is inserted between the closed magnetic path magnetic core 20 and the outer periphery of the wound bobbin 10.

  Thereafter, one winding 13 and the other winding 14 wound around the bobbin 10 are connected to the terminal 51 of the terminal block 40 by soldering or the like, and an adhesive is applied to the insulating wall 44, the closed magnetic path core 20, and the bobbin 10. It becomes a line filter.

  Thus, in the embodiment of the present invention, the bobbin 10 having the through hole 11 in the winding axis direction and having a plurality of flanges, the one winding 13 wound between the flanges of the bobbin 10 and the other winding 14, a terminal block having a closed magnetic path core 20 for inserting the central magnetic leg 21 into the through hole 11 of the bobbin 10, and a terminal 51 for supporting the bobbin 10 and the closed magnetic path core 20 and to which a terminal of the winding is connected. 40, and the terminal block 40 has an insulating wall 44 protruding between the outer periphery of the bobbin 10 and the external magnetic leg 22 of the closed magnetic circuit core 20, and the insulating wall 44 is A protrusion 47 protruding between the flanges of the bobbin 10 is provided.

  Therefore, according to the embodiment of the present invention, the bobbin projecting into the space generated on the upper surface of the winding between the bobbin collars using the fact that the bobbin collar is not wound to the outer periphery in consideration of loosening at the time of bobbin winding. By providing the insulation wall on the insulation wall, the insulation space distance between the closed magnetic path magnetic core and the winding can be increased with a simple structure to increase the insulation breakdown voltage, and the flat plate shape protruding from the terminal block by providing the protrusion The bending strength of the insulating wall can be increased.

(Second Embodiment)
FIG. 4 is an exploded perspective view of the line filter according to the second embodiment.

  The present embodiment is different from the first embodiment in that a notch 44a is provided in the approximate center of the insulating wall 44 of the terminal block 40, and the recess 17 having an opening on the inner peripheral surface side of the bobbin 10 is made of a magnetic material. A center magnetic core 25 is disposed, and one end 25a of the center magnetic core protrudes to the outer periphery of the bobbin through the through window 18 of the bobbin 10 and is not in contact with the external magnetic leg 22 of the closed magnetic path magnetic core 20 through the notch 44a. It is the point arranged so.

  In this way, it becomes a line filter that can remove common mode noise and normal mode noise, and withstand voltage can be increased with a simple configuration.

  Further, since the protrusion 47 is provided on the insulating wall 44, the bending strength of the flat insulating wall 44 protruding from the terminal block 40 can be increased.

  In the above-described embodiment, the vertical line filter is described in which the sun-shaped closed magnetic path core 20 is placed vertically on the terminal block 40. However, the sun-shaped closed magnetic path core 20 is horizontally disposed. Even if the horizontal line filter is laid down and placed on the terminal block 40, the same effect can be obtained as described above.

  As described above, the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications without departing from the spirit of the present invention.

It is a disassembled perspective view of the line filter in the 1st Embodiment of this invention. It is a completion perspective view of the line filter in FIG. 1 of this invention. It is the front view (a) in FIG. 2 of this invention, the side view (b), and sectional drawing (c). It is a disassembled perspective view of the line filter in the 2nd Embodiment of this invention. It is a top view of the conventional line filter.

DESCRIPTION OF SYMBOLS 1 Line filter 10 Bobbin 11 Through-hole 12 Outer collar part 13 One coil | winding 14 The other coil | winding 15 Middle collar part 16 Divided collar part 17 Recessed part 18 Through-window 19 Gear 20 Closed magnetic path core 21 Central magnetic leg 22 External magnetic leg 25 Center magnetic core 25a One end 40 Terminal block 41 Terminal plate portion 42 Opening portion 43 Frame portion 44 Insulating wall 44a Notch portion 44b Guide portion 45 Upper side 46 Lower side 47 Projection portion 48 Rear end 51 Rear end 51 Terminal 60 Bobbin 62 Closed magnetic path magnetic core 63 One winding 64 The other winding 68 Insulating wall D1 Insulating space distance D2 Insulating space distance W1 Width W2 Width

Claims (3)

A bobbin having a through hole in the winding axis direction and having a plurality of flanges;
One winding and the other winding wound between the flanges of the bobbin;
A sun-shaped closed magnetic circuit core having a central magnetic leg and an external magnetic leg to be inserted into the bobbin through hole;
A terminal block that supports the bobbin and the closed magnetic path magnetic core and has a terminal block to which a terminal of the winding is connected;
The terminal block has an insulating wall which projects into the gap between the outer periphery and the outer magnetic legs of said closed magnetic path core of the bobbin,
The insulating walls have a protruding portion protruding between the flange portion of the bobbin which the coil is wound,
The protruding portion is formed so as to be in non-contact in proximity to the outer periphery of the winding.
A line filter characterized by that.   The line filter according to claim 1, wherein the protruding portion of the insulating wall is continuous with at least a portion facing the closed magnetic path magnetic core.   The line filter according to claim 2, wherein the protruding portion of the insulating wall is formed integrally with the insulating wall.

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