JPH051213U - Common mode chiyoke coil - Google Patents

Abstract

(57) [Abstract] [Purpose] In a common mode choke coil that uses an annular magnetic core for electromagnetic noise suppression, even if a copper wire with a large diameter is used for winding, the winding is easy and the high-frequency characteristics are high. The common mode choke coil is excellent. [Structure] An inter-winding central partition plate 21 that separates two windings from each other while increasing the radius R of an outer peripheral corner of the core insulating case 1 that houses the annular magnetic core 2 having a substantially circular cross section. And a winding-fixing projection 12 having a rectangular outer periphery around which the partition plate in the winding is wound, and the winding 3 is partially wound around the winding-fixing projection 12, and both ends of the winding-fixing projection are wound. The common mode choke coil is divided into and wound.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a common mode choke coil using an annular magnetic core for connecting to an electronic circuit of an electronic device and suppressing electromagnetic noise.

[0002]

[Prior Art]

 The conventional common-mode choke coil for electromagnetic noise countermeasures consists of an annular magnetic core (hereinafter referred to as a core) with a substantially square cross section, housed in a double cylindrical resin core insulation case with a central partition plate, and two When a reciprocating current flows through each of the windings, the two windings are separated by a central partition plate between the windings so that the magnetic flux induced in the core by the magnetic field generated by the current flowing in the windings cancels each other. A common mode choke coil (hereinafter referred to as a coil) was formed by winding each winding section through the equally divided inner space of the core.

[0003]

[Problems to be solved by the device]

 A coil using an annular core whose cross-sectional shape is almost quadrangular is placed in a core insulating case, and when the winding work is performed, the winding is pressed against the corner of the core insulating case because the cross-sectional shape is quadrangular. The copper wire, which is a wire material, must be largely plastically deformed, and particularly when winding a thick copper wire with a diameter of 1.0 mm or more, there is a problem that a great deal of labor is required during winding work. . When winding a conventional coil, the number of turns increases, and if one layer cannot be wound on the core, the windings in the same phase overlap each other, increasing the distributed capacitance of the coil and deteriorating the high frequency characteristics. Alternatively, when impulse noise with a voltage of 2 kV and a pulse width of about 1 μsec is applied, there is a problem that dielectric breakdown occurs between the windings and a rare short circuit occurs, which often makes it unusable for impulse noise.

[0004]

[Means for Solving the Problems]

 The present invention employs an annular magnetic core having a substantially circular cross section with R attached to the corner, and a central partition plate for windings that divides the space of the inner diameter of the core into two equal parts, and a central partition plate between windings. Prepare a core insulation case that has a winding fixing projection that also serves as a partition plate inside the winding that intersects at a right angle, and store an annular magnetic core. It is characterized in that it is divided into winding sections by an in-line partition plate and wound individually to form a common mode choke coil.

That is, the present invention provides a common mode choke coil in which an annular magnetic core is housed in a core insulating case, and two windings are separately wound around an outer circumference of the core insulating case. Has a substantially circular cross-sectional shape, and divides the inner space on the inner diameter side of the core insulation case into two equal parts, and a central partition plate for the windings, and an inner partition plate for the outer wall at the center of the equally divided winding part. A winding fixing protrusion having a square outer periphery that also serves as a winding is provided, and two windings are respectively wound on the winding fixing protrusion with a space between the winding center partition plates. The common mode choke coil is characterized in that it is wound and divided and wound on both sides of the winding fixing protrusion.

[0006]

[Action]

 The cross-sectional shape of the annular magnetic core is made almost circular, the corners of the core insulating case are also made to have a large R, and the central partition plate for inter-winding and the partition plate for inter-winding for separately winding the two windings are installed. By using a core insulation case with a winding fixing protrusion that also fixes the double winding, when winding the core insulation case containing an annular magnetic core with a substantially circular cross section, the wire diameter is large. The winding can be easily wound, and by winding a part of the winding on the winding fixing protrusion, the winding can be wound as closely as possible and the distributed capacitance of the winding is small. A common mode choke coil with frequency characteristics can be used.

[0007]

【Example】

FIG. 1 shows a side view and a bottom view of an embodiment of the present invention, in which an annular magnetic core 2 having a substantially circular cross section is housed in a core insulating case 1 made of resin and having an upper and lower halves and having electrical insulation properties. The winding 3 is wound on the main body 11 with a central partition plate (hereinafter referred to as a partition plate) 21 for winding between them, and the winding is separated and wound, and the protrusion for fixing the winding has a square outer peripheral shape ( Hereinafter, a part of the winding wire is wound around the protrusion 12) to fix the wire. As shown in FIG. 1, the core insulating case 1 is composed of a case body 11, a protrusion 12 formed integrally with the case body 11, and a center partition plate 21 for interwinding. The case body 11 has a cylindrical cross-section as shown in the cross-sectional view of FIG. 2, and forms a storage space for the substantially circular annular magnetic core 2 inside, and a center partition plate for windings in the center direction. 21 and a partition plate base 22, and a protrusion 12 in a direction perpendicular to the inter-winding central partition plate 21. As shown in FIG. 2, the case main body 11 has a fitting step 13 for ensuring an insulation distance between the core 2 and the winding wire 3. Store in the case body.

As shown in FIG. 2, the protrusion 12 has a quadrangular outer periphery, and is located substantially at the center of the winding portion of the case body 11. The winding 3 accommodates the annular magnetic core 2 having a substantially circular cross section in the core insulating case 1, and winds the center of the winding around the protrusion 12 one or more times, and then the winding material toward the partition plate base 22. Wind around. Similarly, a second winding is formed on the opposite side of the inter-winding center partition plate 21 to complete a common mode choke coil. When the core has a quadrangular cross-section as in the past, when winding a winding material with a large diameter, the winding material is pressed against the four corners of the core insulation case. Since the four corners of the core insulating case also have large R, the winding material can be wound with a relatively small force. However, in this case, since the wound winding material does not get caught because the cross section is circular, it has the drawback that it is loosened by the tension of the winding material during winding. A square protrusion 12 is provided, and a part of the winding is wound around the protrusion, fixed so that it is not loose, and then wound around a circular cross-section to facilitate the winding work. Since the winding is done on the left and right of the part, the distributed capacitance is small, and it is possible to obtain a coil in which the winding start and winding end are separated.

[0009]

[Effect of the device]

 As described above, the cross-sectional shape of the annular magnetic core according to the present invention is made substantially circular, the corners of the case body for winding the core insulating case are also provided with R, and the core insulating case has a center partition for windings. Since a winding fixing protrusion is mounted between the plates to fix the winding and separate winding, the winding work is easy, the frequency characteristics are excellent, and the impulsive noise immunity is high. A mode choke coil can be provided.

[Brief description of drawings]

1A and 1B are views showing an embodiment of a common mode choke coil according to the present invention, wherein FIG. 1A is a sectional view and FIG. 1B is a bottom view.

FIG. 2 is a side view taken along the line AA of FIG.

3A and 3B are views of an example of a conventional common mode choke coil, FIG. 3A is a side view, and FIG. 3B is a bottom view.

FIG. 4 is a cross-sectional view taken along line BB of FIG.

[Explanation of Codes] 1 core insulating case 2 annular magnetic core with substantially circular cross section 3 winding 11 case body 12 winding fixing protrusion 13 fitting step 20 annular magnetic core with square cross section 21 central partition plate between windings 22 Partition base

Claims (1)

Claims for utility model registration 1. A common mode choke coil in which an annular magnetic core is housed in a core insulating case, and two windings are separately wound around the outer circumference of the core insulating case. A cross-sectional shape of the annular magnetic core is substantially circular, and a central partition plate for windings that divides the inner space of the core insulating case into two equal parts, and an outer wall at the center of the two divided winding parts. A winding fixing protrusion having an angular outer periphery that also serves as a partition plate inside the winding is provided, and two windings are partially formed on the winding fixing protrusion with the center partition plate between windings separating the windings. A common mode choke coil characterized in that it is formed by winding and winding on both sides of a winding fixing projection.