JPH03276708A - Choke coil for filter - Google Patents

Abstract

PURPOSE:To make the diameter of an outermost layer smaller than the case when the same number of turns is obtained at one position by winding one winding so as to be equally divided in a shape across both leg pieces of an approximately U-shaped half core. CONSTITUTION:Each half core 2 is formed in an approximately U shape by magnetic substances such as ferrite, and the nose surfaces of the leg pieces of both half cores 2 are abutted, thus forming a core in an approximately square shape Beltlike conductors 3 are wound on the peripheries of each leg piece in a shape through insulating layers among each layer. One beltlike conductor 3 is wound on one half core 2, and divided and wound so that the number of turns to each leg piece is equalized. Insulating paper as a separate body to the beltlike conductor 3 is used or an insulating coating composed of polyurethane, polyester, etc., covering the surface of the beltlike conductor 3 can be employed as the insulating layer. Accordingly, a pair of windings 4 are formed to the core 1.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a filter choke coil that can be used primarily for a line filter inserted into a power supply line.

[Conventional technology]

Generally, this type of filter choke coil is formed by winding conductors in multiple layers around an iron core.

[Problem to be solved by the invention]

In the above-mentioned conventional structure, as the number of turns increases, the overall diameter increases, so the winding radius of the outer layer becomes larger and the length per turn becomes longer than that of the inner layer. Moreover, as a result of the increase in the winding radius, there arises a problem that the overall size increases. The present invention aims to solve the above problems, and by winding the winding wire in sections, the winding radius is made smaller than before, and the total length of the winding wire for the same number of turns is shortened,
Moreover, the present invention aims to provide a filter choke coil that is smaller than the conventional filter choke coil.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a pair of half-split iron cores formed to form a substantially U-shaped magnetic path using a magnetic material, and a length that is approximately equal to the length of the leg of the half-split iron core. A pair of coils formed by dividing and winding a wide band-shaped conductor approximately equally around each leg of each half-split iron core with an insulating layer interposed between each layer, The tip surfaces of the legs of both half-split iron cores are butted against each other to form an annular iron core.

[Effect]

According to Nobutari Niki, one winding wire is wound in such a way that it is divided into equal parts by straddling both legs of a roughly 7-shaped half-split iron core, so it can be turned in one place. When obtaining the number of turns, the comparative deviation allows the diameter of the outermost layer to be reduced, and the overall length of the winding to be made shorter than in the past. Furthermore, if the number of turns is the same, the external size is also smaller than before.

【Example]】

The basic configuration is as shown in FIG. 1, and the iron core 1 is formed into an annular shape by combining a pair of half-split iron cores 2. As shown in FIG. 2, each half iron core 2 is formed into a substantially mouth shape from a magnetic material such as ferrite, and as shown in FIG. By doing so, a substantially mouth-shaped iron core 1 is formed. Around each leg piece,
As shown in FIG. 4, the strip conductor 3 is wound in multiple layers with an insulating layer (not shown) interposed between each layer. One strip-shaped conductor 3 is wound around one half-split iron core 2, and the conductor is divided and wound so that the number of turns for each leg piece is equal. As the insulating layer, an insulating paper separate from the band-shaped conductor 3 can be used, or an insulating coating such as polyurethane or polyester that covers the surface of the band-shaped conductor 3 can be used. In this way, a pair of windings 4 are formed on the iron core. For example, in the comparative example shown in FIG. 5, if the width of the iron core is d and the winding thickness is d, the overall width will be 3d and the height will be Bci+α. On the other hand, the fourth
In the present invention shown in the figure, if the number of windings is made equal, the winding thickness will be d/2, so the overall width will be 2d (-d + 2Xd/2>, and the height will be 4d7β, (β is (the gap between the outermost layers of the strip-shaped conductor).Actually, α is relatively large, about d, so the heights of the comparative example in Fig. 5 and the present invention are almost the same, resulting in In other words, the present invention is smaller due to its narrower width.Also, since the outermost layer of the present invention has a smaller diameter, the overall length of the winding 4 is also smaller than that of the comparative example. The length is shorter than that, and the material cost is reduced.

[Embodiment 2] In this embodiment, as shown in FIG. 6, the area of the center piece of each half-split iron core 2 is made larger than in Embodiment 1.
The extra portion formed compared to Example 1 has almost no magnetic effect, but as a result of the large heat dissipation area,
This has the effect of reducing temperature rise. Furthermore, even if the center piece of the half-split iron core 2 is made larger in size, as shown in FIG. 7, as long as it is within the range where the winding wire 4 is wound, the size will not increase as a whole. The other configurations are the same as in the first embodiment. "The choke coil 3 formed like a double series" is
For example, it can be used for an outlet with a noise filter as shown in FIG. That is, case 10
is formed in a size that can be attached to a mounting frame 20 that can be attached to a ready-made embedded box standardized by JISM rating or Japan Wiring Appliance Industry Association standards. The case 10 is formed by assembling a body made of synthetic resin and a cover 12, and has a standardized unit size of 3.
It is made to be twice the size. The cover 12 has flanges 13 on both sides, and the body 11 and the cover 12 have a pair of assembly frames 1 attached to both flanges 13, respectively.
Combined by 4. That is, the assembly frame 14 includes three leg pieces 1.4a, and each leg piece 14a is arranged so as to span from the cover 12 to the body], and each leg piece 1.4. The body 1 and the cover 12 are joined by caulking the tip of the a to the body 11. The assembly frame 14 is provided with protruding engagement claws 14b that can be engaged with engagement holes 21 formed on both sides of the mounting frame 20 made of synthetic resin. The mounting frame 20 has a long hole 22 into which a box screw is inserted to attach the frame 20 to the embedded box, and a plate screw for attaching the decorative plate to the mounting frame 20 is screwed together. A screw hole 23 and the like are formed. A pair of blade insertion openings 15a into which the power source blades of the plug are inserted and a blade insertion opening 15b into which the grounding blades of the plug are inserted are opened on the front surface of the cover 12, forming a single plug blade. It serves as an insertion slot. Furthermore, a grounding terminal 16 is attached to the front surface of the cover 12 so that an electrical device can be grounded even with a plug that is not equipped with a grounding blade to be inserted into the blade insertion opening 15b. The interior of the body 11 is divided by a partition wall 17 into a filter storage chamber 18 and an outlet storage chamber 19. Moreover, one outlet storage chamber is further divided into a plurality of chambers. The filter housing chamber 18 houses a noise filter 30 that includes a choke coil 31 inserted into the power line, capacitors 32a to 32d, and a varistor 33 as a surge absorber. As described above, the choke coil 31 has a pair of windings 4, and both windings 4 are connected to the capacitors 32a, 32b and the varistor 33 via the conductive pattern of the printed circuit board 35. One end of each of the windings 4 passes through the printed circuit board 35 and is connected to the pair of left and right connection plates 4], a, and 41b, respectively, and the other end of one of the windings passes through the printed circuit board 35. and is connected to the terminal plate 42a. Capacitor 32a
, 32b, and the varistor 33 are connected to both connecting plates 41, respectively.
a and 41b. At one end of each connection plate 41a, 41b on the side of one outlet storage chamber, a blade receiver 43a, 43b for receiving a power source blade of a plug is fixed at a position corresponding to the blade insertion opening 15a, respectively. Further, a grounding connection plate 41c is provided in the outlet storage chamber 19, and a grounding connection plate 41c is provided in the outlet storage chamber 19.
A blade holder 43c for receiving a grounding blade is fixed at a position corresponding to the blade insertion opening 15b. Each blade holder 43a to 4
3C is formed in a shape corresponding to a so-called hooking plug blade, and when the plug blade of the plug is inserted into the plug blade insertion opening 15a to 15c and rotated, it is prevented from being removed. The grounding connection plate 41c is connected to the grounding pattern of the printed circuit board 35 via the lead wire 44. Further, a lead plate 45 is fixed to this grounding pattern, and a grounding terminal 16 is fixed to the lead plate 45. The outlet storage chamber 19 further stores a terminal board 42b. This terminal plate 42b is connected to one end of the winding 4 of the choke coil 31 via a lead wire 46. A connecting plate 41b is connected to the other end of this winding 4. Terminal portions 47a to 47C are formed in a portion of the grounding connection plate 41c and the terminal plates 42a and 42b, and each terminal portion 47a
47c, together with a pair of lock springs 48 and a release button 49, form well-known connection terminals. Terminal board 42
a and 42b are connected to a power source, and a grounding connection plate 41C is grounded. With the above configuration, the noise filter 30 is inserted between the power source and the outlet.

【Effect of the invention】

As described above, the present invention includes a pair of half-split iron cores formed to form a substantially U-shaped magnetic path using a magnetic material, and a width that is approximately equal to the length of the leg of the half-split iron core. A pair of windings formed by dividing and winding a band-shaped conductor into each leg of each half-split iron core in approximately equal parts with an insulating layer interposed between each layer. The tip surfaces of each leg of the iron core are butted against each other to form an annular iron core, and one winding is straddled over both legs of the roughly U-shaped half-split iron core. Since the winding is divided into equal parts, the diameter of the outermost layer can be made smaller compared to obtaining the same number of turns in one place, and the overall length of the winding can be made smaller than before. This has the effect of being relatively short. Further, it has the advantage that the outer diameter is smaller than that of the conventional method if the number of turns is the same.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing Embodiment 1 of the present invention, FIG. 2 is a perspective view showing a half-split iron core used in the same, FIG. 3 is a perspective view showing the iron core used in the same, and FIG. Vertical cross-sectional view of the same as above, No. 5
The figure is a vertical sectional view showing a comparative example, and FIG. 6 is a second embodiment of the present invention.
FIG. 7 is a sectional view of a main part of the same, and FIG. 8 is an exploded perspective view showing an electrical outlet with a noise filter according to the present invention. ] Iron core, split iron core, strip conductor, winding.

Claims (1)

[Claims] (1) A pair of half-split iron cores formed to form a substantially U-shaped magnetic path using a magnetic material, and a strip-shaped conductor with a width approximately equal to the length of the leg of the half-split iron core between each layer. and a pair of windings formed by dividing and winding each leg of each half iron core into approximately equal parts with an insulating layer in between, and each leg of both half iron cores. A filter choke coil characterized in that the end surfaces of the pieces are butted against each other to form an annular iron core.