JPH10256054A - choke coil - Google Patents

Abstract

(57) [Problem] To provide a choke coil which does not cause a rare short circuit due to superposition of a high voltage pulse. SOLUTION: In a choke coil in which a conductor provided with an insulation coating is wound around a cylindrical bobbin portion of a coil bobbin having a flange portion formed at both ends, the coil winding has a cylindrical winding portion. It is located on the first flange part side of the frame part, connected to the first terminal of the coil bobbin, and the winding end part is located on the second flange part side of the cylindrical winding frame part, and is connected to the second terminal of the coil bobbin. Because of this, the dielectric strength of the choke coil can be increased, and a rare short circuit can be prevented by superposition of a high-voltage pulse.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply choke, and more particularly, to a coil used in a high-frequency choke, a smoothing coil, a blockage loop, a blocking loop, a reactor, and the like.

[0002]

2. Description of the Related Art FIG. 2a is a schematic sectional view showing a winding structure of a conventional choke coil, and FIG. 2b is a connection diagram of the conventional choke coil. Conventional choke coil
As shown in FIGS. 2A and 2B, flange portions 2 are provided at both ends.
A single conductor 5 obtained by applying an insulating coating to the cylindrical winding frame portion 4 on which the first and second 22 are formed is started to be wound in the direction of arrow 4 ′, that is, from the end 22 of one of the cylindrical winding frame portions 4. It is formed by winding up to the end 21 of the other cylindrical winding frame portion, further turning it back as indicated by a folding arrow 4 ″, and winding it up to the end 22 of the winding frame portion 4 at the beginning of winding.

[0003]

However, in the conventional choke coil, as described above, one conductor 5 is folded back between the flanges 21 and 22 of the coil bobbin 3 and wound.
Because both ends of the conductor 5 are connected to the terminals 9 and 10,
Since the low potential side and the high potential side of the winding are close to each other on the terminal side, for example, when a high-voltage pulse is superimposed, a withstand voltage cannot be obtained, and a rare short circuit may occur. SUMMARY OF THE INVENTION It is an object of the present invention to solve a problem relating to the withstand voltage strength of a conventional choke coil against a high-voltage pulse.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a choke coil which does not cause a rare short circuit due to superposition of a high voltage pulse. That is, the present invention provides a choke coil in which a conductor with insulation coating is wound around a cylindrical bobbin portion of a coil bobbin having a flange portion formed at both ends. The coiled bobbin is located on the first flange side, connected to the first terminal of the coil bobbin, and the winding end is located on the second flanged side of the tubular bobbin, and the second of the coil bobbin In a choke coil characterized by being connected to a terminal, the present invention also provides a coil bobbin having a flange portion formed at both ends and a conductor provided with an insulating coating on a cylindrical bobbin frame portion. In the choke coil, the coil winding is wound in a plurality of layers, and the winding start of the coil winding in each layer is located on the first flange side of the cylindrical winding frame portion, and the first coil bobbin is wound. And the end of the coil winding of each layer Located in the second flange portion side of the cylindrical winding frame portion,
A choke coil characterized by being connected to a second terminal of a coil bobbin.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a choke coil according to the present invention, a tubular bobbin is formed between flange portions at both ends of a coil bobbin, and an insulated conductor is provided at a winding start position of the tubular bobbin. To a winding end position in one or more layers. When the coil winding is wound in a single layer, the winding start portion is located at one end of the cylindrical winding frame portion, and the winding start portion is positioned at the other end of the cylindrical winding frame portion. The end of the volume is located. When the coil winding is wound in multiple layers,
A winding start portion of each coil winding is located at one end of the cylindrical winding frame portion, and a winding end portion of each coil winding is located at the other end of the cylindrical winding frame portion.

In the present invention, the profile of the cross section of the cylindrical bobbin portion of the coil bobbin is formed to be circular, square or polygonal.
The winding shape of the winding depends on the shape of the cylindrical bobbin,
It is formed in a square or a polygon. The cross-section of the winding is circular, square or polygonal, for example, in the case of a circular cross-section,
It is preferable that the wire diameter of the conductor provided with the insulation coating is large enough to be wound in a single layer in the cylindrical winding frame portion.

In the present invention, the winding method is as follows.
It can be a winding method of a conventional coil such as a single layer winding, a space winding, an aligned winding, a random winding, a bank winding and a bifilar winding. However, single winding, aligned winding, bank winding and bifilar winding are preferable because the winding density can be increased. In the present invention, an insulating material or a core material such as ferrite is used for the coil bobbin of the choke coil.

[0008]

In the present invention, the coil winding, whether in one layer or a plurality of layers, has a winding start portion located on the first flange portion side of the cylindrical winding frame portion and a first terminal. And the end of the coil winding is located on the second flange portion side of the cylindrical winding frame portion and is connected to the second terminal, so that the distance between adjacent portions is almost the same. Since it is a voltage, even if it is a high voltage, it does not cause a large voltage difference,
Even if the dielectric strength is the same as the conventional one, the dielectric breakdown does not occur under the superposition of the high voltage pulse.

[0009]

EXAMPLES Examples of the embodiments of the present invention will be described below, but the present invention is not limited by the following description and illustrations. FIG. 1a is a schematic sectional view showing a winding structure of a choke coil which can be used for a high voltage pulse according to an embodiment of the present invention. FIG. 1b is a connection diagram of the choke coil of the present invention.

In the embodiment shown in FIGS. 1a and 1b,
The choke coil 1 has a cylindrical bobbin 4 of a coil bobbin 3 having a length of, for example, 18 mm and having flanges 21 and 22 having a diameter of, for example, 8 mm. 45 mm windings 51, 52 and 53
Is wound three times. In this example, the windings 51, 52
The winding start portions 61, 62, and 63 of the windings 51, 52, and 53 are all located inside the flange portion 22, and the winding end portions 71, 72, and 73 of the windings 51, 52, and 53 are all located on the flange portion 2.
1 inside. An insulating tape 8 is wound around the outside of the winding, and supports the windings 51 to 53 in a stable manner.

In this embodiment, the winding start portions 61 to 63 of the windings 51 to 53 are collectively connected to one terminal 9, and
The winding end portions 71 to 73 of 1 to 53 are collectively connected to the other terminal 10. In this example, the dielectric strength is determined by the dielectric strength between one terminal 9 and the other terminal 10 and the winding frame 4.
, The dielectric strength between the winding start portions 61 to 63 and the winding end portions 71 to 73 of the windings 51 to 53, and is determined by the distance between the winding start portion and the winding end portion. In other words, the greater the distance between the flange portions 21 and 22, the greater the dielectric strength between them, and therefore, in the present invention, the conventional choke coil. The dielectric strength can be increased as compared with.

Since the choke coil of the present embodiment is constructed as described above, the winding 51 is connected to the terminal 9 at the end 11 of the winding 51 and tightly wound around the cylindrical winding frame 4. ,
The winding end 71 of the winding 51 is temporarily fixed to a spindle (not shown) of the winding machine.
Similarly to the winding 51, the ends 12 and 13 of the respective windings are sequentially connected to the terminals 9 so that the cylindrical winding frame 4
The winding end portions 72 and 73 are temporarily fastened to a spindle (neither is shown) of the winding machine when the winding ends 72 and 73 have been wound, respectively. The insulating tape 8 may be wound around the outside and stopped, and the temporarily fixed winding end portions 71 to 73 may be collectively connected to the terminal 10 to be formed.

In this embodiment, winding start portions 61 to 63 and winding end portions 71 to 7 of the windings 51 to 53 of the choke coil 1 are provided.
3 and a voltage difference between adjacent portions of the adjacent windings 51 to 53 can be reduced. Therefore,
The dielectric strength of the choke coil 1 in this example can be increased as compared with the dielectric strength of the conventional choke coil. For example, the choke coil of this example has a wire diameter of 0.3 to
Using a 0.45 mm insulated wire, the flange 2
1 and 22 were each wound around a coil bobbin having a diameter of 8 mm and a cylindrical bobbin 4 between the flanges having a length of 18 mm. A high voltage impulse of 5 KV was superimposed on the formed choke coil 1, but no dielectric breakdown occurred.

In this embodiment, the winding is wound three times around the coil bobbin. However, the winding may be a single-layer winding, a double-layer winding, or a multilayer winding of three or more layers. In this example, the terminals of the coil are arranged on one flange of the coil bobbin. However, one terminal may be provided on one flange and the other terminal may be provided on the other flange. A plurality of coil bobbins may be formed in a row. The coil bobbin can be made of an insulating material or ferrite.

[0015]

According to the present invention, the coil winding has a winding start portion located on the first flange side on one side of the cylindrical winding frame portion, and is connected to the first terminal, and a winding end portion has a winding end portion. Since it is located on the second flange side of the other side of the cylindrical winding frame and connected to the second terminal, the dielectric strength can be increased as compared with the conventional choke coil, and the thickness of the coating layer can be increased. It is possible to reduce the thickness, and even if a high-voltage pulse is superimposed, dielectric breakdown does not occur.

[Brief description of the drawings]

FIG. 1a is a schematic sectional view showing a winding structure of a choke coil which can be used for a high-voltage pulse according to an embodiment of the present invention. b is a connection diagram of the choke coil of the present invention.

FIG. 2A is a schematic sectional view showing a winding structure of a conventional choke coil. b is a connection diagram of a conventional choke coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Choke coil 21, 22 Flange part 3 Coil bobbin 4 Cylindrical winding frame part 4 'arrow 4 "Return arrow 5, 51, 52, 53 Winding 6 Winding start part of winding 5 61 Winding start part of winding 51 62 Winding Start of winding of wire 52 63 Start of winding of winding 53 7 End of winding of winding 71 End of winding of winding 51 72 End of winding of winding 52 73 End of winding of winding 53 8 Insulating tape 9 One terminal 10 The other terminal 11 The terminal of the winding start part 61 of the winding 51 12 The terminal of the winding start part 62 of the winding 52 13 The terminal of the winding start part 63 of the winding 53

Claims (3)

[Claims] 1. A choke coil in which a conductor with insulation coating is wound around a cylindrical bobbin portion of a coil bobbin having a flange portion formed at both ends, wherein the coil winding has a cylindrical start portion. The first terminal of the coil bobbin is connected to the first terminal of the coil bobbin, and the end portion of the winding is positioned on the second flange of the cylindrical bobbin. A choke coil characterized by being connected to a choke coil. 2. A choke coil in which a conductor with insulation coating is wound around a cylindrical bobbin portion of a coil bobbin having flange portions formed at both ends, the coil winding is wound in a plurality of layers. The winding start portion of the coil winding of each layer is located on the first flange portion side of the cylindrical winding frame portion, connected to the first terminal of the coil bobbin, and the winding end portion of the coil winding of each layer is cylindrical. A choke coil, which is located on the second flange portion side of the winding frame portion and is connected to the second terminal of the coil bobbin. 3. The choke coil according to claim 2, wherein the number of turns of each layer of the coil winding wound in a plurality of layers on the cylindrical winding frame portion is the same for each layer. .