JPH07153629A - Toroidal coil - Google Patents

Abstract

PURPOSE:To improve the performance of a toroidal coil by a method wherein winding wires, which are wound on the toroidal coil, are wound by a separation winding method and insulating plates are respectively provided at the wiring parts of the end parts of the winding wires. CONSTITUTION:Wiring wires, which are wound on the left and right winding sections of a toroidal coil, are wound by a separation winding method which begins to wind from the center of each winding section, parts to be lap-wound with the winding wires are limited and moreover, insulating plates 13 and 14 to separate winding wire end parts 11a and 11b and 12a and 12b from the winding wires on the toroidal coil are projected on a square pedestal 16. The winding wires on the coil are wound by the separation winding method and moreover, as the insulating plates are provided at the winding wire end parts, the withstand voltage performance of the coil is improved and the high-frequency characteristics of the coil are improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise-preventing toroidal coil, and more particularly to a pedestal structure for mounting a toroidal common mode choke coil.

[0002]

2. Description of the Related Art A common mode choke coil is connected to an input side of an AC power source of an electronic device to prevent electromagnetic noise. This type of coil is usually toroidal. A common mode toroidal coil has a toroidal core housed in a core insulation case whose outer surface is equally divided by a central partition plate and a partition, and winding is made in each winding section to make a coil. It is a structure in which the ends of the winding are passed through the through holes at the four corners of the pedestal and pulled out to the bottom surface of the pedestal. The posture of the coil on the pedestal is
It is placed horizontally with the axial direction of the core vertical, or vertically with the central partition plate of the insulating case vertical with the axial direction of the core horizontal. FIG. 3 shows an example of a conventional vertical toroidal coil in which the winding is omitted and the pedestal portion is disassembled. The core insulating case composed of the case body 1 and the lid body 2 has a central partition plate 3 and a partitioning base 4, and one outer peripheral portion of the partitioning base 4 is made wide and tall to be a connecting portion with the rectangular pedestal 5. It is a thing. The coupling portion is provided with a positioning groove 6 and an engagement step portion (not shown).

The rectangular pedestal 5 is a rectangular insulating plate having the axial outer dimension and the outer diameter of the core insulating case as long sides, and has a ridge 7 corresponding to the positioning groove 6 at the center and a projecting piece connected to the partition base 4. 8 and a pair of locking projections 9 with locking claws corresponding to the engaging step portions, and through holes 10 are provided near the four corners. Two windings (not shown) are wound around the winding sections on both sides of the central partition plate 3 and the partition base 4 of the core insulating case, and the ends of the windings are axially extended in mutually opposite directions, The ridge 7 is fitted into the positioning groove 6, and the ridge 7 is placed on the pedestal 5 and fixed to the partition 4 by the locking projections 9, and the respective ends of the windings are inserted into the through holes 10 at the four corners from top to bottom. I was passing through.

[0004]

The conventional longitudinally placed toroidal coil shown in FIG. 3 has an end of the winding at the upper end of the compartment even if the winding itself does not have an approaching portion on the winding end side and the winding start side. Since the part is always close to the winding on the lower end side, it is connected to an electronic device and a high voltage impulse (square wave) is applied using a noise simulator (called an immunity test)
However, since the impulse withstand voltage is low, there is a drawback that discharge is generated at a position close to the winding.

[0005]

According to the present invention, in a common mode vertical toroidal coil, the winding is a separate winding that advances from the midpoint to both sides, and the pedestal is between the coil mounting portion and the through hole. It is assumed that an insulating plate is integrally projected on the.

[0006]

[Operation] Separate winding, which advances from the midpoint of the winding to both sides,
A large number of turns is achieved by separating the winding start portion from the winding end side winding and the end portion. The insulating plate protruding from the pedestal prevents the ends of the winding, which are external connection terminals, from approaching the winding.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An external view and an exploded perspective view of an embodiment according to the present invention are shown in FIGS. 1 (a) and 1 (b). 1 (a) and 1 (b), a toroidal core (not shown) is housed in the case main body 1, and the core insulating case with the lid 2 assembled thereto is placed on both sides of the central partition plate 3 and the partition stand 4 (partitioned in FIG. 1). The windings 11 and 12 are wound around winding sections of the left and right semi-circular portions of the table 4. Winding 1 of this common mode toroidal coil
1 is the middle point 1 of the winding material indicated by a black circle in FIG.
1c is placed in the center of the winding section and is placed above and below (see FIG.
Then, in the counterclockwise direction), the winding is wound in a single layer, and the winding ends 11a and 11b are pulled out in opposite directions in the axial direction of the toroidal core in the lower part and the upper part of the winding section. The winding 12 is a separate winding similar to the winding 11.

Since the case of a single layer is shown in FIG. 1, winding is started from the lower end portion 11a of the winding section and the upper winding end portion 1 is started.
It is the same as the normal winding that ends in 1b, but if it is assumed that a normal winding is repeated for one and a half laps, the (start) winding end portion 11a will have about a portion near the (end) winding end portion 11b of the winding material. 1/3
Of the winding material, in the lap winding of one reciprocating half, the one approaching the (start) winding end 11a is the one near the (start) winding end 11a of the winding material. / 3 length (2/3 length from (end) winding end 11b),
It is possible to carry out multiple windings in which the (end) winding end 11b side is separated from the (start) winding end 11a. As for the impulse withstand voltage in the immunity test, in the case of the lap winding, the separated winding can withstand a higher voltage than the normal winding.

The rectangular pedestal 16 is a rectangular insulating plate having a dimension that is sufficiently larger than the axial outer dimension of the core insulating case and the outer diameter of the case as its long sides. A protrusion 7, a protrusion 8 and a locking protrusion 9 are provided at the center of the rectangular pedestal 16. Further, the insulating plates 13 and 14 having different heights so as to block the through holes 10 provided at the four corners of the rectangular pedestal 16 from the central portion.
Are projected integrally. The insulating plate 13 has a height that reaches the lower end of the vertical center partition plate 3 of the vertically installed toroidal coil, and the insulating plate 14 having a high height has a height slightly lower than the nip portion of the partition stand 4 of the vertically installed coil. That is, the protruding pieces 15 are integrally provided on the outer surface and at both corners. The common mode toroidal coil is mounted on the rectangular pedestal 16 with the positioning groove 6 and the ridge 7.
Are engaged with each other, and the locking projection 9 is engaged and fixed to an engaging step portion (not shown) formed in the lower portion of the partition 4. Left and right winding 1
The winding end portions 11a and 12a of the windings 1 and 12 are passed over the upper edge of the insulating plate 13 and passed through the through holes 10 near the lower end of the insulating plate 13 from the top to the bottom, and the other windings of the windings 11 and 12 are wound. Line end 11b,
12b (12b is not shown in FIG. 1 (a)) through the upper edge of the insulating plate 14 and the through hole 10 near the lower end of the insulating plate 14.
A toroidal coil for noise prevention is completed by pulling out through the bottom of the rectangular pedestal 16 and using it as a terminal. The protruding piece 15 provided on the insulating plate 14 is provided at the winding end portions 11b, 1 of the windings 11, 12.
2b is a member that prevents the insulating plate 14 from coming off the upper edge of the insulating plate 14, but it may be omitted, or it may be provided in the middle of the outer surface of the insulating plate 14 for guiding to the through hole 10.

FIGS. 2 (a) and 2 (b) show another embodiment, and the method of winding the winding on the toroidal coil is shown in FIG.
The same method as in the embodiment shown in FIG. 4, but the through holes at the four corners of the square pedestal 16 are used as the cutout grooves 17, and the low-height insulating plate 13 and the high-height insulating plate 14 protruding from the square pedestal 16 Two notch grooves 18 were formed on each upper edge. Winding end portions 11a, 11b and 12 are provided in the cutout grooves 17 and 18, respectively.
Insert a and 12b. According to this method, the winding end 11
It becomes possible to wire a, 11b and 12a, 12b easily and stably.

[0011]

According to the present invention, the winding of the common mode toroidal coil is formed as a separate winding which is wound from the midpoint of the winding material placed in the center of the winding section, and the insulating plate is provided on the pedestal in a protruding manner. Since the end of the winding is separated from the winding and used as the external connection terminal, the impulse withstand voltage is about twice as high as that of the conventional square pedestal, the high-frequency characteristics are improved, and the high-performance vertical common mode A toroidal coil can be provided.

[Brief description of drawings]

FIG. 1A is an external perspective view showing an embodiment of the present invention. FIG. 1B is an exploded perspective view of the same embodiment.

FIG. 2 (a) is an external perspective view showing another embodiment of the present invention. FIG. 2B is an exploded perspective view of another embodiment.

FIG. 3 is an exploded perspective view showing a conventional example without a winding.

[Explanation of symbols]

 1 Case Main Body 2 Lid Body 3 Central Partition Plate 4 Partition Platform 5,16 Square Pedestal 6 Positioning Groove 7 Projection 8 Projecting Piece 9 Locking Projecting Piece 10 Through Hole 11, 12 Winding 11a, 11b, 12a, 12b Winding End Part 11c Winding material middle point 13,14 Insulation plate 15 Projecting piece 17,18 Notch groove

Claims (1)

[Claims] 1. A toroidal coil is housed in a core insulating case equipped with a central partition plate and a partitioning block, and the coils obtained by respectively winding the windings in the divided winding sections are arranged horizontally in the axial direction and the central partitioning plate is provided. In a toroidal coil that is placed on a square pedestal with the ends vertically, and the ends of the windings are inserted into the through holes near the four corners of the pedestal and pulled out to the bottom of the pedestal, the windings start from the middle point in the winding section. It is a separate winding that advances,
The pedestal is a toroidal coil in which an insulating plate is integrally projected between the coil mounting portion and the through hole.