JPH0590047A - Choke coil - Google Patents

Abstract

PURPOSE:To eliminate coil heat caused by leakage flux and facilitate coiling operation for a choke coil used for the deflection circuit for a television image receiving device and a display device. CONSTITUTION:A pair of cores 2 are inserted into a bobbin 12 through a gap 3 and a plurality of dividing collars 20 are provided in the axis longitudinal direction of the coiling part 9 of the bobbin 12 at intervals 23 to form first-sixth sections 25a-25f. A space 18 is provided at a position corresponding to the gap 3 of the core 2 and a vacant section 22 in which coil 15 is not wound is formed in the space 18. The coil 15 is wound in the first-sixth sections 25a-25f to form a coil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a choke coil used in a deflection circuit of a television receiver, a display device or the like.

[0002]

2. Description of the Related Art As a deflection circuit of a television receiver or a display device, there are a deflection circuit and a high voltage system which are integrated, and a deflection circuit and a high voltage circuit which are independent from each other. FIG. 7 shows an example of a circuit diagram of a type in which a deflection system circuit and a high voltage system circuit are separated and independent. The deflection system and the high voltage system are respectively driven by independent drive circuits 1a and 1b. The deflection side circuit has a horizontal output transistor 6a, a damper diode 7a and a resonance capacitor 8a. The high-voltage circuit also has a horizontal output transistor 6b, a damper diode 7b, and a resonance capacitor 8b, and has a substantially similar circuit configuration. The high-voltage circuit is provided with a choke coil 11 for supplying a current from the driving power supply 16b.

FIG. 5 shows a winding structure of a general choke coil used in a deflection circuit of this type. In the figure, a pair of cores 2 are inserted through a gap 3 into the core insertion hole of the bobbin 12. A winding wire 15 is laminated and wound around the winding drum portion 9 of the bobbin 12 with the film 4 interposed therebetween.
A barrier tube 5 is provided inside the twelve collar 13.

[0004]

However, a high voltage is applied to the choke coil from the drive power supply 16b, and a large drive current flows. Therefore, the leakage flux 19 is applied to the coil winding 15 near the gap 3 of the core 2.
There is a problem that eddy current is generated by intersecting with (leakage magnetic flux), and the eddy current causes the winding 15 to generate heat. Further, if the winding wire 15 is changed from a single wire to a litz wire, the cross-sectional area per wire becomes small, so that the heat generation of the eddy current is considerably suppressed, but there is a problem of cost increase.

As a countermeasure against this, as shown in FIG.
The space 3 near the gap 3 is defined as the space 18.
A structure having no coil is also proposed in. According to the structure of this proposal, when a current is applied to the choke coil 11, the leakage flux 19 flows into the space 18.
Even if occurs, since there is no winding, no eddy current is generated, and accordingly, no heat is generated. However, even in this winding method, since the high voltage is applied to the coil layer, the film 4 and the barrier tube 5 cannot be omitted, and the winding work of winding the winding while avoiding the space 18 is further avoided. It is extremely troublesome.

The present invention has been made to solve the above problems, and an object thereof is to provide a choke coil which does not generate heat in the coil due to leakage flux and which can be easily wound.

[0007]

In order to achieve the above object, the present invention is constructed as follows. That is, in the choke coil of the present invention, the pair of cores are inserted into the core insertion holes of the bobbin through the gaps, and the bobbin winding body is divided by the partitioning collars provided at intervals in the axial direction. The partition flange located in the gap of the core is an empty section in which no winding is wound, and the winding is wound between the remaining partition flanges avoiding this empty section to form a coil. The lead wires on the winding start side and the winding end side of the coil are characterized in that they are drawn out in a non-contact state with the coil portion through a guide portion formed at the peripheral end portion of the partition flange.

[0008]

The magnetic flux is generated in the gap of the core by driving the choke coil, and a part of this magnetic flux leaks to the outside. However, since the vicinity of the gap is composed of an empty section, there is no winding, and the generation of eddy current due to leakage flux is prevented. In addition, the lead wires on the winding start side and the winding end side of the coil winding are hooked and guided by the guide portion of the partition flange to maintain the non-contact state with the coil.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same parts as those of the conventional choke coil shown in FIG. 5 are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 shows an explanatory view of a cross section of a main part of a choke coil 11 according to an embodiment of the present invention. FIG. 2 shows a main configuration of a partition collar 20 provided on the choke coil 11 according to the embodiment. In these drawings, a pair of cores 2 are inserted through a gap 3 into the core 2 insertion hole of the bobbin 12. Bobbin 12 winding body 9
A plurality of partition collars 20 along the axial direction with a space 23 between them.
A total of 7 pieces (20a to 20g) are formed, and a plurality of guide portions 21A to 21D of the convex or concave coil winding 15 are provided at the peripheral end portion of each partition collar 20 (4 pieces in the embodiment). ) And guide groove
26 and are provided. The bobbin 12 is manufactured by integrally molding an insulating resin.

A space 18 is formed in the central portion of the bobbin 12 in the axial direction of the bobbin 12, that is, on the side of the bobbin 12 located in the gap 3 of the core 2, and the space 18 is wound. It constitutes an unwound section 22 of unwound wire. The first to third sections 25a to 25 are provided on both sides of the empty section 22.
c and 4th to 6th sections 25d to 25f, 3 sections in total, divided into 6 sections by partition collars 20a to 20g, and windings are wound around these 6 sections to form a coil. Has been done. In addition, the lead wire 14 at the beginning and end of winding of the coil is provided with a partition collar 20 located in the lead passage.
It has a structure in which it is hooked through the guide portions 21A to 21D of a to 20 g and connected to an external terminal, and this lead wire keeps a non-contact state with the coil portion. A plurality of terminals 24 are formed on the lower end side of the choke coil.

FIG. 3 shows a choke coil 11 according to this embodiment.
4 is a front view of the bobbin 12 and FIG. 4 shows a state in which the winding 15 is wound around the bobbin 12 of FIG. 3 to form a coil. In these drawings, the lead wire 14 at the beginning of winding of the coil is first connected to the terminal 24a, and this winding 15 is inserted into the guide groove 26 of the partition collar 20a and wound around the winding drum portion 9 of the first section 25a. To form a coil, and then enter the guide groove 26 of the partition flange 20b, and wound around the winding barrel portion 9 of the second section to form a coil. Similarly, the coil is formed by winding around the winding drum portion 9 of the third section. After forming these coils, the winding 15 is hooked on the guide portions 21C of the partition flanges 20d to 20a, guided to the terminal 24b, and connected to the terminal 24b. The winding 15 leaving the terminal 24c advances to the empty section 22 along the guide portion 21B, crosses the empty section 22 and enters the guide groove 26 of the next partition flange 20e to enter the fourth section 25d.
Forming a coil on the 5th and 6th sections 25e,
A coil is formed on 25f. Next, the winding 15 is 20g
Hook the guide part 21D of ~ 20a,
20 g to 20 a is guided to the terminal 24 d along the guide portion 21 D and connected to the terminal 24 d. Note that terminals 24a and 24c
The terminals 24b and 24d are connected in parallel on the substrate, or the terminals 24b and 24c are connected in series to form one coil.

According to the present embodiment, the bobbin 12 is provided with a plurality of (7 in the embodiment) partition flanges 20, and six coil layer sections and the central portion of the bobbin 12 in the axial direction of the winding drum portion 9 are provided. Since the empty section 22 having no winding coil is provided in the coil, even if a current flows through the choke coil 11 and a wet magnetic flux 19 is generated, the position of the empty section 22 does not exist in the winding 15. Since the wetting magnetic flux 19 and the winding 15 do not cross each other, no eddy current is generated and there is no concern about heat generation of the winding 15. In addition, since the coil winding has a plurality of sections (six in this embodiment), the voltage applied between the lines between the sections becomes small, so the line withstand voltage in each section is secured. Therefore, the interlaminar film 4, the barrier tape 5 and the like are unnecessary, and the labor for inserting them can be saved and the winding work becomes easy. Further, since the winding 15 does not generate heat, it is not necessary to use an expensive litz wire, and a single wire is enough.
The cost can be reduced as well as the removal of the barrier tape 5 and the like. Further, since the lead wire 14 of the coil is wired through the guide portion 21 on the partition flange 20 which is separated from the coil,
This lead wire 14 is kept in non-contact with the coil, and a sufficient breakdown voltage between the windings can be secured. Further, since the heat generation of the winding 15 is suppressed, it is possible to increase the gap 3 between the cores 2 and to allow the direct current superimposing current to the core 2 to flow.
The diameter of the core 2 can be reduced accordingly.

The present invention is not limited to the above-mentioned embodiment, and various embodiments can be adopted. For example, in the above embodiment, the bobbin 12 was made by integrally molding the insulating resin,
The partition collar 20 may be adhered or attached to the winding barrel portion 9 of the bobbin 12.

[0014]

As described above, according to the present invention, in a choke coil used in a deflection circuit, a winding is wound around a bobbin with a plurality of partition flanges provided with a guide portion for a lead wire, and a plurality of coil sections are provided. Since it was created and an empty section was provided in the central space of the bobbin, even if a current flows through the choke coil and leakage flux is generated, the leakage flux is not wound because the winding is not wound. Since it does not cross the wire, no eddy current is generated and there is no concern about heat generation in the winding.

Further, since the coil is divided into a plurality of coil sections, the withstand voltage between the lines is secured in each section, so that the laminated film, the barrier tape, etc. are not required, and the labor for inserting them can be saved. Will be easier.

[Brief description of drawings]

FIG. 1 is an explanatory view of a cross section of a main part of a choke coil according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a main configuration of a partition collar of the choke coil according to the embodiment.

FIG. 3 is a front view of the bobbin of the choke coil according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a state in which a winding of the choke coil is wound.

FIG. 5 is a sectional view of a main part of a conventional choke coil.

FIG. 6 is a sectional view of an essential part of another structure of a conventional choke coil.

FIG. 7 is a circuit diagram of an example of a deflection circuit of a television receiver or a display device.

[Explanation of symbols]

 11 Choke coil 12 Bobbin 14 Lead wire 15 Winding 20 Partition collar 21 Guide section 22 Empty section 26 Guide groove

Claims (1)

[Claims] 1. A pair of cores are inserted into a core insertion hole of a bobbin via a gap, and a bobbin winding body is divided by partitioning flanges provided at intervals in the axial direction thereof. The section flange located in the gap part of is formed with an empty section where winding is not wound, and the winding is wound between the remaining section collars avoiding this empty section to form a coil. A choke coil in which the lead wires on the winding start side and the winding end side are drawn out while maintaining a non-contact state with the coil portion through a guide portion formed at the peripheral end of the partition collar.