JP2569628Y2 - Saturable reactor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saturable reactor used as a distortion correcting transformer for correcting upper and lower pincushion distortion of a display device such as a television receiver.

[0002]

2. Description of the Related Art As shown in FIG. 6, a saturable reactor of this type includes a core C made of a magnetic material, a primary coil A wound around the core C, and a pair of coils wound around the core C. And the secondary coils B and B ′. The secondary coils B and B ′ are wound in opposite directions, and a bias magnetic field is applied to the core C. As a specific structure of a saturable reactor of this type, for example, a structure as shown in FIG. 5 is conventionally known. This saturable reactor consists of ferrite,
It includes a pair of drum-shaped cores 1 and 2 made of a magnetic material such as Ni-Zn, a columnar permanent magnet 5, and a pedestal 6 having six pin-shaped terminals 7, 8 and 9.

A primary coil (not visible in FIG. 5 and hidden by a secondary coil) is wound around two drum-shaped cores 1 and 2, and further divided into cores 1 and 2 to separate secondary coils 3 and 2. Four are wound. A permanent magnet 5 is sandwiched between drum-shaped cores 1 and 2 provided with the coils, and the cores 1 and 2 and the permanent magnet 5 are placed on a pedestal 6 and fixed with an adhesive or the like. In this case, the pair of secondary coils 3, 4 are arranged so that their winding directions are opposite to each other. Further, the leads of the coils 3 and 4 (including the primary coil) are connected to the bases of the terminals 7, 8 and 9, respectively. Thereby, a saturable reactor having an equivalent circuit as shown in FIG. 6 is obtained.

[0004]

However, such a saturable reactor has two separate cores 1 and 2.
Two primary coils, and each core 1,
Since the secondary coils 3 and 4 have to be wound around 2, the winding operation is extremely troublesome. In particular, a drum-shaped core 1,
Since the second winding is performed, it is difficult to automate the winding. Further, a pair of drum-shaped cores 1 and 2 around which the primary coil and the secondary coils 3 and 4 are wound and the permanent magnet 5 must be mounted on the pedestal 6 and adhered. The assembling work of each component also requires a lot of trouble, such as having to hold the magnet 5 until it is completely fixed.

Further, the magnetic path of the bias magnetic field formed by the cores 1 and 2 and the permanent magnets 5 is open at the ends of the cores 1 and 2 opposite to the side where the permanent magnets 5 are sandwiched. Therefore, there is also a disadvantage that the magnetic resistance is large. In view of the above-mentioned problems, the present invention has an object to provide a saturable reactor that can automate a winding process, can easily assemble each component, and has a small magnetic resistance of a magnetic path. And

[0006]

That is, in order to achieve the above object, the means adopted in the present invention includes a primary coil 23 and a pair of secondary coils 24, 25 around cores 30, 30 to which a bias magnetic field is applied. And a bobbin 21 having a winding drum 22 having a core insertion hole 26 at the center thereof, one end of which is inserted from both ends of the core insertion hole 26 to face the inside of the bobbin 21, and A pair of U-shaped cores 3 whose ends face each other outside the core insertion hole 26.
0, 30 and the core 30 of the central portion 27 of the bobbin 21;
Recesses 28 provided at positions where both ends of 30 face each other,
29 and the cores 3,
0, 30 and a primary coil 23 wound around a bobbin 22 of the bobbin 21
And secondary coils 24 and 25 wound around the winding drum portion 22 of the bobbin 21.

[0007]

In the saturable reactor of the present invention, all the coils 23, 24 and 25 are wound around one bobbin 21, so that the winding operation is extremely easy.
1 to perform automatic winding. Further, the concave portions 28 and 29 of the bobbin 21 after the winding
, And one end of a pair of U-shaped cores 30, 30 may be inserted into the core insertion holes 26, and the permanent magnets 31, 31 may be sandwiched between both ends of the cores 30, 30. Therefore, assembly of each member can be easily performed. In particular, both sides of both cores 30, 30 are attracted to the permanent magnets 31, 31 by the magnetic force, and the above-mentioned assembled state is temporarily temporarily fixed, so that subsequent bonding of each member can be performed very easily.
Further, two permanent magnets 31, 31 are sandwiched between both ends of the U-shaped cores 30, 30, so that the cores 30, 30 are formed.
A closed magnetic path is formed to apply a bias magnetic field to the magnetic field, and a magnetic circuit having a small magnetic resistance can be formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS.
The saturable reactor includes an insulating bobbin 21 and primary and secondary coils 23, 24, 25 wound on the bobbin 21.
And a pair of cores 30, 30 inserted into the bobbin,
The permanent magnet 3 sandwiched between the tips of the cores 30
1 and 31 are provided.

The bobbin is made of a molded body such as a resin and has a winding drum 22 having a core insertion hole 26 at the center (see FIGS. 3 and 4). The outer periphery of the winding drum portion 22 is divided into two parts by a substantially rectangular central portion 27 provided to be orthogonal to the outer peripheral side. Further, flanges 36, 36 are provided at both ends of the winding drum 22.

As shown in FIG. 3, the core insertion hole 26 provided so as to penetrate through the inside of the winding drum 22 is a rectangular hole slightly larger than the cross-sectional shape of the cores 30 described later. The central portion 27 is reached from both ends where the flanges 36 and 36 are provided. As shown in FIG. 1, cores 30 and 3
Recesses 38 and 39 slightly wider than the width of 0 are provided. In the illustrated embodiment, the cores 30, 30, which will be described later, have a U-shaped symmetrical shape, and accordingly, the width of the core insertion hole 26 and the width of the concave portions 38, 39 are all the same. Further, three pairs of pin-shaped terminals 32, 33, 34 project from the bottom of the central portion 27 and the flanges 36, 36.

As shown in FIG. 3 and FIG.
Recesses 28 and 29 are provided on the upper and lower sides of the groove 7. The widths and lengths of the recesses 28 and 29 are determined by permanent magnets 31 and 3 described later.
Slightly larger than dimension 1. The upper concave portion 28 is shallow, and has a depth that the permanent magnet 31 can enter about half. On the other hand, the lower concave portion 29 is deep, and the core insertion hole 26 is in the central portion 2.
7 is reached. These recesses 28,
The shape of 29 corresponds to the shape of the permanent magnets 31, 31. In the illustrated embodiment, the bottom and top surfaces of the recesses 28, 29 are all semi-cylindrical to accommodate the cylindrical permanent magnets 31, 31. Has become.

A primary coil 23 and secondary coils 24 and 25 are wound around the winding body 22. First, the central part 27
The primary coil 23 is wound on the lower side of the winding body 22 over both sides of the bobbin 21, and the lead wires at both ends are entangled with the bases of the terminals 32, 32 provided at the bottom of the flange 36 at both ends of the bobbin 21, and soldered. Have been. The primary coil 23 is wound on both sides of the central portion 27 through a groove 35 provided on one side of the concave portion 28 on the upper side in the central portion 27. FIG.
Reference numeral 23 ′ denotes an intermediate portion of the primary coil 23 passing through the groove 35. The secondary coils 24 and 25 are wound on the primary coil 23 separately on both sides of the central portion 27, and lead wires at both ends thereof are connected to the central portion 2 of the bobbin 21.
7 and terminals 33, 3 provided on the bottom of the flange 36, respectively.
3, 34, 34 are entangled and soldered to the base. The winding directions of these secondary coils 24 and 25 are opposite to each other. It is preferable that the outer periphery of the secondary coils 24 and 25 be covered with an exterior resin, an exterior varnish, an exterior tape, or the like from the viewpoints of protection and securing insulation.

The cores 30, 30 are made of ferrite, Ni-Z
It is made of a magnetic material such as n, has a U-shape as a whole, and has a rectangular cross section. As already mentioned, this core 30,
The cross section of 30 corresponds to the shape of the core insertion hole 26 provided through the inside of the winding drum 22 and is slightly smaller than the width and height thereof. The length of both ends of the cores 30 and 30 is a length from the opening of the core insertion hole 26 on the flange 36 side to the recess 29 of the central portion 27. One end of each of the cores 30 is inserted into the core insertion hole 26 from both flange sides, and the other end is fitted into the central portion 27 and the grooves 38, 39 of the flanges 36, 36. The middle portion is vertically attached to the upper portions of the flanges 36,36.

The cores 30 are preferably symmetric so that their cross-sectional shapes are the same at both ends.
Thereby, assembly such as insertion of the cores 30 into the core insertion holes 26 becomes easier. Further, the cross-sectional shape of the cores 30, 30 does not necessarily have to be rectangular as in the illustrated embodiment, but may be other shapes. However, in that case, it is preferable to change the cross-sectional shape of the core insertion hole 26 according to the shape.

The permanent magnets 31 have opposite magnetic poles on both end surfaces. In the example shown in the figure, cylindrical permanent magnets 31 are used. These permanent magnets 31, 3
1 are respectively inserted into the concave portions 28 and 29 of the central portion 27,
It is sandwiched between the tips of the cores 30, 30 therein. The permanent magnets 31, 31 apply a bias magnetic field to the coils 23, 24, 25 through the cores 30, 30, so that the magnetic poles thereof are directed in predetermined directions.
The magnetic circuit is sandwiched between the tips of the coils 0, 30. The cores 30, 30 and the permanent magnets 32, 32 allow magnetic flux in a certain direction to pass through the magnetic circuit.

In this manner, in a state where the permanent magnets 31, 31 are sandwiched between both ends of the cores 30, 30, the permanent magnets 3
The tips of the cores 30, 30 are pulled by the magnetic force of 1, 31, and the assembled state is temporarily fixed. Accordingly, an adhesive or the like is applied and cured so that the cores 30, 30, the permanent magnets 31, 31, and the bobbin 21 are finally fixed to each other, but the assembly state as described above is naturally maintained during that time.
The cross-sectional shapes of the permanent magnets 31, 31 do not necessarily have to be cylindrical as in the illustrated embodiment, but may be other shapes. However, in that case, the permanent magnets 31, 31
It is preferable to change the shape of the concave portions 28 and 29 for accommodating the same in accordance with the shape of.

[0017]

As described above, according to the present invention, the winding work of the coils 23, 24 and 25 is facilitated, the automation thereof can be performed, and the assembly of each member can be easily performed. Performance can be improved. further,
Since a magnetic circuit having a small magnetic resistance can be formed, its characteristics can be improved.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a saturable reactor according to an embodiment of the present invention.

FIG. 2 is a perspective view of the saturable reactor in an assembled state according to the embodiment.

FIG. 3 is a side view of the saturable reactor in an assembled state according to the embodiment, which is vertically cut at the center.

FIG. 4 is a front view of the saturable reactor in an assembled state according to the embodiment, which is vertically cut at the center.

FIG. 5 is a perspective view of a conventional saturable reactor.

FIG. 6 is an equivalent circuit diagram of a saturable reactor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 bobbin 22 bobbin winding drum part 23 primary coil 24 secondary coil 25 secondary coil 26 bobbin core insertion hole 27 central part of bobbin 28 bobbin concave part 29 bobbin concave part 30 core 30 core 31 permanent magnet

Claims (1)

(57) [Scope of request for utility model registration] A core provided with a bias magnetic field;
In a saturable reactor in which a primary coil (23) and a pair of secondary coils (24) and (25) are wound around (30), a winding drum section (22) having a core insertion hole (26) at the center.
A bobbin (21) provided with a core insertion hole (2
6), a pair of U-shaped cores (30), (30) facing each other inside the bobbin (21) and facing each other outside the core insertion hole (26), and the bobbin (30). The cores (30), (3) in the central portion (27) of (21).
0) are provided at positions where both ends thereof face each other.
8), (29), the permanent magnets (31), (31) housed in the recesses (28), (29) and sandwiched between both ends of the cores (30), (30); 21) having a primary coil (23) wound around a winding body (22) and secondary coils (24) and (25) wound around a winding body (22) of the bobbin (21). A saturable reactor.