JP2599088Y2 - Surface mount type noise filter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount type noise filter for suppressing electromagnetic noise using a winding type toroidal coil.

[0002]

2. Description of the Related Art In a conventional noise filter of this type, a toroidal core is housed in a toroidal case having a partition plate in the center, and a winding is applied to each of the divided sections, and a winding terminal is passed through a terminal board. It was a structure to be mounted on.
Therefore, this type of noise filter has a problem in that it takes a long time to wind the wire in a toroidal case having a partition plate in the center of the core case in advance, and cannot be used for surface mounting.

[0003]

In order to eliminate these drawbacks, the present invention adopts a structure in which the substrate mounting surface has a surface mounting terminal structure, and the surface mounting terminal has a structure provided with pin terminals rising from the mounting surface. A rectangular base in which the windings are separated at the center of the circular recess for accommodating the coil, a central partition plate is attached to ensure electrical insulation between the multiple windings, and the central partition plate and the surface-mounting terminals are integrally molded with an electrical insulating material By using a base, the toroidal core is pre-wound, and then a toroidal coil wound on a square base is attached. It is an object of the present invention to provide an inexpensive surface-mounted noise filter that guarantees the above.

[0004]

A toroidal coil is formed by winding a plurality of conductive wires around a toroidal coil having a surface coated with an electrically insulating coating to form a toroidal coil. Has a surface mounting terminal on the lower surface thereof, and bends the surface mounting terminal 90 degrees to form a holding portion for connecting a lead wire of a winding at an upper end portion. A center partition plate for insulation between windings is provided at the bottom inside the circular recess. The provided rectangular base is integrally formed with an electrical insulating material, each winding of the toroidal coil is distinguished by a central partition plate, and a resin is filled in a central hole of the toroidal coil, and the toroidal coil is fixed to the rectangular base, and the winding is performed. The wire end is passed through the holding portion of the surface mount terminal and fixed by soldering to constitute the surface mount type noise filter of the present invention.

That is, the surface mount type noise filter of the present invention
Consists of a toroidal coil with an electrically insulating coating on the surface, a toroidal coil in which a plurality of windings each having both ends are divided and wound, a circular recess opened on the upper surface, and an inner bottom of the circular recess. And an insulating container provided with a central partition plate for inter-winding insulation extending from the center of the inner bottom in the radial direction at an interval corresponding to the number of the windings and corresponding to the inner diameter of the toroidal core. a rectangular base of the box-shaped, wherein provided around the circular recess of the insulating container wherein the square base both
Each of the plurality of pinching portions of both ends of the upper end which projects out of an upper surface of the end portion near the plurality of windings sandwiching respectively and the sandwiching portion s
And a surface mount terminal having an outwardly protruding portion extending outward from both ends along the lower surface of the rectangular base, and the toroidal coil includes: The circular recess is accommodated in the circular recess through a central partition plate, and the insulating filling resin is filled in the circular recess accommodating the toroidal coil, and the toroidal coil is fixed to the rectangular base. Are characterized by being held by the holding portion and soldered.

[0006]

The surface mounted noise filter according to the present invention fits in the inner diameter of the divided toroidal core corresponding to the number of windings divided and wound on the toroidal core having an electrically insulating coating on the surface. A center partition plate is attached to the bottom surface of the circular recess for accommodating the toroidal coil, and the surface mount terminals corresponding to the number of windings are mounted on a square base integrally formed of a resin molding material made of an electrical insulating material. The toroidal coil wound by dividing the wire is divided into windings for each section of the center partition plate and housed in the circular recess. Since the structure is such that the coil is filled with an insulating resin material to fix the toroidal coil and improve the electrical withstand voltage between the windings, it is a small-sized and easily manufactured surface-mounted noise filter.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the surface-mounted noise filter according to the present invention, and FIG. 2 is an assembled perspective view of the surface-mounted noise filter according to the present invention. In FIG. 1, in the center of the upper surface of a rectangular base 1 made of a resin molding material made of an electric insulating material, a toroidal coil in which a split winding is applied to a toroidal core having an electric insulating coating applied to the surface to be housed on the bottom surface. ,
Circular recess 2 for coil storage provided with a center partition attached to the inner diameter of the toroidal core is provided, and surface mounting for soldering and fixing the winding terminal of winding 7 of the toroidal coil around square base 1 This is a structure in which a holding portion 4 integrated with a terminal 5 is provided. Here, the surface mounting terminal 5 is
The rectangular base 1 penetrates in the vertical direction, extends outward along the lower surface of the rectangular base 1, and has a portion protruding outward. This outwardly extending and projecting outward portion is soldered to a pattern or the like on the substrate. The toroidal coil 6 is housed in the circular recess 2, the winding end of the winding 7 of the toroidal coil 6 is sandwiched between the holding portions 4, soldered and fixed, and the center partition plate 3 at the center of the toroidal coil 6 is fixed. The place is filled with an insulating resin such as silicon to fix the toroidal coil to the rectangular base 1 to provide a surface mount noise filter for suppressing common mode noise. In the embodiment of the present invention, a toroidal coil having two windings is used as an example. However, when a toroidal coil having three or four windings is used, The center partition plate 3 is housed inside the circular recess around the center of the circular recess. A toroidal core having a toroidal core inner diameter divided into three or four equal parts is used. by mounting the number corresponding to the winding terminals of multi-winding, it is possible to form the surface mounted type noise filters corresponding to Troy da Rukoiru.

[0008]

As described above, the surface mount type noise filter according to the present invention has a structure in which a conventional noise filter of this type is wound on a toroidal case having a partition plate at the center. The toroidal coil is coated with insulated copper wire on a toroidal core whose surface has been electrically insulated, and the toroidal coil is fixed to the rectangular base by distinguishing it for each winding in the circular recess of the rectangular base with a central partition plate. Fit
Since the structure is fixed to the rectangular base with the filling resin, it is possible to provide a surface-mounted noise filter having an advantage that the assembling operation is easier and smaller than before.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a surface-mounted noise filter according to the present invention.

FIG. 2 is a completed perspective view of the surface-mounted noise filter according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Square base 2 Circular recessed part 3 Center partition plate 4 Clamping part 5 Surface mounting terminal 6 Toroidal coil 7 Winding

Claims (1)

(57) [Scope of request for utility model registration] 1. A toroidal coil a plurality of windings and each divided winding having a respective end portions in the toroidal core which has been subjected to electrically insulative coating on the surface, the opened circular recess and this <br/> of the upper surface A central partition for insulation between windings that rises from the inner bottom of the circular concave portion and extends from the center of the inner bottom in the radial direction at an interval equal to the number of windings corresponding to the inner diameter of the toroidal core. A box-shaped rectangular base made of an insulating container provided with plates, and both ends of the plurality of windings provided at an upper end provided around the circular concave portion of the insulating container and protruding from upper surfaces near both ends of the rectangular base. part penetrate in the vertical direction the rectangular base a multiple sandwiching portion sandwiching each and from each of the holding portions, outer <br/> side extending outwardly of the opposite ends along the lower surface of the rectangular base A surface mounting terminal having a protruding portion at the toroidal terminal. The toroidal coil is accommodated in the circular recess through the center partition plate, and the insulating filling resin is filled in the circular recess in which the toroidal coil is accommodated, and the toroidal coil is fixed to the rectangular base. A surface-mounted noise filter, wherein each of both ends of the wire is sandwiched by the sandwiching portion and soldered.