JP4240344B2 - choke coil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a choke coil, and more particularly to a common mode choke coil formed by using a flat copper wire and combining two 8-shaped winding coils into a U-shaped ferrite core.
[0002]
[Prior art]
A common mode choke coil is used as a countermeasure component for removing electromagnetic noise by inserting it into a power supply line of a switching power supply. Conventionally, a toroidal common mode choke coil has been used in which a toroidal core is incorporated with two winding coils in which a copper wire having a round cross section is wound in the same winding direction.
[0003]
Alternatively, as shown in FIG. 3, the winding coil 12 formed by connecting two copper wires having a round cross section in series so as to form an 8-shape is attached to the legs of the two U-shaped ferrite cores 3. Two common mode choke coils incorporated through the insulating partition plate 10 and the insulating plate 11 have been used.
[0004]
[Problems to be solved by the invention]
However, since the conventional common mode choke coil has a round cross section, the space factor, which is the ratio occupied by the copper wire, is low, and the winding portion is large. Alternatively, the insulating partition plate between the two winding coils has a large thickness and is large in order to ensure sufficient insulation.
[0005]
The present invention solves the above-described problems and provides a small choke coil.
[0006]
[Means for Solving the Problems]
In the present invention, one or a plurality of flat copper wires are laminated and wound in the vertical direction in contact with the wider surface, the other end of the lead wire is folded back into a figure 8, and laminated and wound with the same number of turns. The magnetic field generated by the flowing current consists of two winding coils and divided magnetic cores that form a closed magnetic circuit that faces in the same direction, and the magnetic field generated by the current flowing through the two winding coils makes a round. A choke coil arranged to cancel the magnetic fields of a closed magnetic circuit to each other to become zero and a magnetic field generated by a current input to the two winding coils in the same direction is biased to each other, and the two winding coils One of the two is attached to the inside of a container-like insulator having a bottom surface that is an insulating partition plate and an opening, and the opening is located on the opposite side of the bottom surface, and insulates the two winding coils from each other And insulation with two cylindrical parts A magnetic leg of the magnetic core is inserted inside the cylindrical portion of the plate, and the winding coil is inserted outside the cylindrical portion to insulate between the winding coil and the magnetic core. This is a common mode choke coil.
[0007]
One of 8-shaped winding coil of so mounted in the container-shaped insulator has a bottom surface of the insulating partition plate, can thin the insulating partition plate, can be miniaturized.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a common mode choke coil according to the present invention will be described below in detail with reference to the drawings.
[0009]
FIG. 1 is an external perspective view of the common mode choke coil of the present invention. As shown in FIG. 1, the common mode choke coil of the present invention includes two winding coils 1 and 1a obtained by winding a rectangular copper wire in a shape of 8 so that a surface in a thin direction is laminated. The two legs of the divided U-shaped ferrite core 3 are inserted.
[0010]
FIG. 2 is an exploded perspective view showing the components arranged in assembling order. Note that the terminal block and the core holding spring are omitted. Between the winding coils 1 a having the same specifications as the winding coil 1, a container-like insulator 6 made of an insulating resin and having a withstand voltage function is interposed. One winding coil 1 a is stored in the container-like insulator 6. The container-like insulator 6 has a thickness of about 1 mm at the bottom serving as a partition between the coils. In addition, the thickness of the conventional insulation partition plate 12 shown in FIG. 3 is about 3-4 mm. The reason why the thickness of the bottom portion can be made thinner than before is that one of the winding coils 1a is wrapped in the container-like insulator 6 to maintain and improve the withstand voltage performance.
[0011]
The bottom of the container-like insulator 6 is formed with a hole into which both legs of the U-shaped ferrite core 3 can be fitted. In addition, the same shape of the insulating coil 4 is incorporated on both sides of the two same-shaped winding coils 1 and 1 a, and the legs of the U-shaped ferrite core 3 are provided at two locations in the center of the insulating plate 4. A cylindrical portion 5 is formed to ensure a withstand voltage between the winding coils.
[0012]
After assembling the components shown in FIG. 2, the core holding spring 7 is pressed from the back of the U-shaped ferrite core 3 (not shown), and is also fixed to the terminal block (not shown). The common mode choke coil assembly of the present invention shown in FIG. 1 is assembled by welding both lead wires 1 and 1a to the terminals of the terminal block. Thereafter, the entire surface is molded with an insulating resin to complete the common mode choke coil of the present invention.
[0013]
As described above, in this embodiment, a U-U-shaped ferrite core is used, but other than this, an EE core is used, and the shape of the container-like insulator and the insulating plate is not impaired. It is possible to change to Further, the present invention can be similarly applied to not only a common mode choke coil but also a general choke coil.
[0014]
【The invention's effect】
As described above, according to the choke coil of the present invention, a rectangular copper wire is used for the winding coil and the bottom of the container-like insulator is used for the insulating partition plate. The length dimension in the leg direction can be reduced, and the overall size can be reduced.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a common mode choke coil of the present invention.
FIG. 2 is an exploded perspective view showing components of a common mode choke coil according to the present invention arranged in assembling order.
FIG. 3 is an exploded perspective view of a conventional common mode choke coil.
[Explanation of symbols]
1, 1a (8-shaped) winding coil 3 U-shaped ferrite core 4 Insulating plate 5 Tubular part 6 Container-like insulator 7 Core holding spring 8 Terminal block 10 Insulating partition plate 11 (Conventional) insulating plate 12 Winding coil (conventional)

Claims (1)

One or a plurality of rectangular copper wires are laminated and wound in the vertical direction in contact with the wide surface, the other end of the lead wire is folded back into a figure of 8 and laminated and wound with the same number of turns, and a flowing current is generated. The magnetic field formed by two winding coils and divided magnetic cores that form a closed magnetic circuit in which the magnetic fields are directed in the same direction. mutually canceled and becomes zero magnetic field, and the magnetic field created by the currents will be entered in the same direction to the two winding coils a choke coil disposed so as to urge each other, one of the two winding coils and has a bottom surface and an opening which is an insulating partition plate, together with the opening on the opposite side of the bottom surface is mounted within the container-shaped insulator which is located, to insulate between the two winding coils, 2 Said cylinder of insulating plate having two cylindrical parts A magnetic leg of the magnetic core is inserted into the inside of the cylindrical portion, and the winding coil is inserted outside the cylindrical portion to insulate between the winding coil and the magnetic core. Mode choke coil.

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