JPH10149932A - High voltage transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high voltage transformer in which a mounting area for a transformer is made slender and small, and assembly work is improved. SOLUTION: A bobbin 3 on which a primary winding 5 and a secondary winding 6, which is divided by partitions 3d, are wound has a core inserting hollow hole 3b and collars 3a on both ends of a winding frame, and a terminal burying part 3c below the collar 3a is provided with terminals 7. A partition wall 3e keeping insulation between the primary winding 5 and the secondary winding 6 is provided between them, and a hole 3f vertically reaching the hollow hole 3b of the bobbin 3 is formed on the top surface of the partition wall 3e. An I core 1 is inserted into the hollow hole 3b of the bobbin 3, and an E core 2 is joined to the I core 1 from the upper part of the winding axis direction of the bobbin 3, and side legs 2b and 2c of the E core 2 face the upper surfaces of both ends, respectively, of the I core 1 exposed to the outside from the hollow hole 3b of the bobbin 3, and the center leg 2a of the E core 2 is inserted into the hole 3f of the partition wall 3e between the primary winding 5 and the secondary winding 6 of the bobbin 3 so as to face the I core 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage transformer such as a backlight transformer mounted on the back side of a display device using liquid crystal such as a liquid crystal monitor.

[0002]

2. Description of the Related Art A backlight transformer, which is one of the conventional high-voltage transformers, includes a ferrite shown in FIG.
A pair of E-shaped cores 32 is used as a transformer core, and the E-shaped cores 32 are incorporated in a horizontal direction into a bobbin 33 on which a primary winding 35 and a secondary winding 36 are provided. 11 and FIG.
As shown in FIG. 2, the ferrite cores of the E-shaped core 42 and the I-shaped core 41 are used as transformer cores,
2 is to be wound on the left and right legs.
Is attached to one of the side legs 42b, and the secondary bobbin 44 to which the secondary winding 46 is applied is attached to the other side leg 42c. It faces each leg of the E-shaped core 42. According to this method, a thin transformer can be formed by shortening the leg length of the E-shaped core 42, and the primary winding 45 and the secondary winding 46 are formed of different bobbins 43, 44, respectively. To improve insulation.

[0003]

In the conventional high-voltage transformer, the heights of the magnetic core and the bobbin in the vertical direction are suppressed in order to cope with the reduction in thickness. Middle leg 32 like core 32
If a is the winding axis of the coil, the side legs 32b and 32c other than the middle leg 32a will be located outside the bobbin 33. That is, the use of a flat E-shaped core will enable the transformer mounting area of the transformer to be increased. Widely needed. FIG.
1 and the transformer in which the E-type core 42 and the I-type core 41 are combined have a small installation area of the E-type core 42, but the bobbin 4 is attached to the side legs 42b and 42c of the E-type core 42.
3 and 44 are mounted, which requires a large mounting area as a transformer. In addition, from the cross-sectional view of FIG. 12, the primary winding 45 is disposed on the side leg 42b of the E-shaped core corresponding to the winding shaft.
The winding is gradually wound in the outer circumferential direction. Therefore, near the winding shaft, which is the deepest part of the primary winding 45, heat radiation of the heat generated by the winding is poor, causing a temperature rise. The same applies to the secondary winding 46. SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-voltage transformer with a reduced transformer mounting area and further improved assembling workability.

[0004]

SUMMARY OF THE INVENTION The present invention provides an I-type core and an E-type core.
In a transformer using a magnetic core composed of a type core, the transformer has the I-type core attached to a hollow hole of a bobbin on which a primary winding and a secondary winding are applied, and the E-type core includes:
Positioned above the bobbin in the direction perpendicular to the axis of the bobbin, and opposed to the I-shaped core, between the outside of the hollow hole of the bobbin and the primary winding and the secondary winding of the bobbin. And a high-pressure transformer formed in a hole passing through a hollow hole of the bobbin provided on the upper surface of the partition wall. In the present invention, the cross-sectional area of the middle leg of the E-shaped core is smaller than the cross-sectional area of another magnetic path forming the magnetic core of the transformer, and the middle leg of the E-shaped core is
This is a high-voltage transformer that is not located at the center of the side leg of the E-shaped core located on the left and right of the middle leg. In the present invention, the distance between the center leg of the E-shaped core and the side legs located on the left and right of the center leg is 1
The distance between the middle leg of the E-shaped core sandwiching the secondary winding and the side leg of the E-shaped core adjacent to the primary winding is set to be shorter than the size of the other side leg and the middle leg. Transformer. Further, in the present invention, at least one of two or more convex portions extending along the extension of the bobbin's hollow hole from the flange or the terminal embedding portion of the bobbin's coil winding frame is formed in at least one of the extending directions of the bobbin's hollow hole. It is a high voltage transformer. Further, in the present invention, a high-voltage transformer having a terminal for connecting the primary winding or the secondary winding is provided on a partition wall between the primary winding and the secondary winding of the bobbin.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Primary winding 5 and partition 3d
The bobbin 3 around which the secondary winding 6 divided by the above is wound has a hollow hole 3b for inserting a core, and flanges 3a at both ends of the winding frame, and a terminal embedded portion 3c below the flange 3a has a terminal. 7 are provided. A partition 3e for maintaining insulation between the windings is provided between the primary winding 5 and the secondary winding 6, and the upper surface of the partition 3e reaches the hollow hole 3b of the bobbin 3 vertically. A hole 3f is provided. The I-shaped core 1 is inserted into the hollow hole 3b of the bobbin 3, and at this time, the I-shaped core 1 is a partition between both ends of the hollow hole 3b of the bobbin 3 and the primary winding 5 and the secondary winding 6. 3e
The E-shaped core 2, which can be seen from the hole 3 f of the E-shaped core 1 and is combined with the I-shaped core 1, is combined with the I-shaped core 1 from above the bobbin 3 in the winding axis direction.
b and 2c are exposed outside the hollow hole 3b of the bobbin 3.
The middle leg 2a of the E-shaped core 2 is inserted into the hole 3f of the partition wall 3e between the primary winding 5 and the secondary winding 6 of the bobbin 3, It faces the I-shaped core 1. With the above configuration, by reducing the width dimension of the core and the bobbin, the mounting area with respect to the substrate can be made to be a small and elongated area, and the opposing portion of the core can be visually observed without being hidden by the bobbin, so that workability is good. is there.

[0006] In the high-voltage transformer, the secondary winding requires 100 times or more the number of turns of the primary winding as compared with the primary winding, and the secondary winding has a thin wire. It is necessary to use a large bobbin to reduce the number of winding laminations considering heat generation because it is used. Also, adjust the core to the shape of the bobbin, and do not place the center leg at the center of the left and right legs. The position of the magnetic core with respect to the coil was made uniform as a position corresponding to the winding frame of the secondary winding and the secondary winding. Also, by making the middle leg of the E-shaped core smaller than the cross-sectional area of the other side leg, the hole 3f for inserting the middle leg of the E-shaped core shown in FIGS.
Can be reduced in thickness, and the dimensions of the bobbin, ie, the transformer, can be reduced.

As shown in FIG. 3, the bobbin structure having the I-shaped core of the present invention as a winding shaft is provided outside the hollow hole 3b of the bobbin 3, as shown in FIG.
Protrusions 11 and 12 joined to the flange 3a and the terminal embedding part 3c at both ends of the coil winding frame are extended from the hollow hole 3b of the bobbin 3, and the protrusions 11 and 12 are inserted into the hollow hole 3b of the bobbin 3 by I. It serves as a guide when inserting the mold core. And I
This suppresses the horizontal movement of the E-shaped core combined with the die core. Further, outside the other hollow hole, flanges 3a at both ends of the coil bobbin shown in FIG.
Are formed in the extension of the hollow hole 3b of the bobbin 3 and have a parenthesis shape that blocks the extension of the hollow hole. The bracket-shaped projections 13 and 14 serve to prevent the I-type core inserted into the hollow hole 3b of the bobbin from slipping out and to position the E-type core combined vertically from above, and are combined with the I-type core. This suppresses the horizontal movement of the E-shaped core.

FIG. 5 and FIG. 6 are diagrams in which a core is actually incorporated in the bobbin. The I-shaped core 1 is inserted into the hollow hole 3b of the bobbin 3 from the convex portions 11 and 12 parallel to the hollow hole 3b of the bobbin 3 shown in FIG. (3) abuts the bracket-shaped projections 13 and 14 that block the extension of the hollow hole 3b of the bobbin 3, and does not protrude from the hollow hole 3b of the bobbin 3, thereby facilitating the positioning of the I-shaped core 1. The E-shaped core 2 combined with the I-shaped core 1 inserted in the hollow hole 3b of the bobbin 3 is incorporated from above the I-shaped core 1 in the vertical direction. Convex part 1 located outside
The positions facing the I-shaped core 1 are stabilized by 1, 12, 13, and 14, and the horizontal movement is suppressed. The opposing portions of the I-shaped core 1 and the E-shaped core 2 can be visually observed without being blocked by the convex portions 11, 12, 13, and 14 outside the hollow hole 3b of the bobbin 3, so that the core having good workability is incorporated. Work.

In the figure, the convex portion is the same as the upper surface of the flange 3a, but the upper surface of the convex portion may be located below or above the upper surface of the flange, and the convex portion contacts the terminal burying portion 3c. However, a gap may be provided between the terminal embedding portion 3c and an adhesive or the like may be applied to the gap to fix the core to the bobbin. FIGS. 7 and 8 show an embodiment. . FIG.
The protrusions 16 and 17 provided outside the hollow hole 3b of the bobbin 3 on the insertion side of the I-shaped core are formed along the extension of the hollow hole 3b, and the core facing portions of the protrusions 16 and 17 In the part corresponding to the side surface of the I-type core and the E-shaped core, an adhesive made of epoxy resin or the like is applied to bond the core-facing part to each other. This is an adhesive coating section for firmly fixing the mold core. FIG. 8 shows the projections 18 and 19 provided outside the hollow hole 3b in the opposite direction of FIG.
The protrusions 18 and 19 are formed along the extension of the hollow hole 3b, and the terminal burying portion 3 is provided below the protrusions 18 and 19.
A gap is provided between the I-shaped core and the bobbin by applying an adhesive made of an epoxy resin or the like and firmly fixing the bobbin.

In the bobbin of the high-voltage transformer according to the present invention, a terminal 20 is provided below the partition 3e between the primary winding 5 and the secondary winding 6, and the terminal 20 is connected to the primary winding. 5 and 2
The terminal or middle of the secondary winding 6 is connected to be the terminal of each winding. The most important function is that the transformer of the present invention has a small mounting area and is an elongated transformer. In the reliability vibration test, bending occurs at the middle part of the transformer in the longitudinal direction, and the worst-case transformer breaks and breaks down.Therefore, providing a terminal in the middle prevents the bending phenomenon due to vibration and stably fixes the transformer. .

[0011]

The transformer of the present invention has a small mounting area and is long and thin, so that it is easy to arrange the transformer at the time of designing, and in the process of manufacturing the transformer, the transformer can be incorporated into the bobbin while visually observing the opposing part of the core. Further, a convex portion for guiding or locking is provided outside the hollow hole of the bobbin, and the insertion position of the I-type core into the bobbin hollow hole and the combination position with the E-type core are stabilized by the convex portion. It becomes work and can greatly improve work.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a first embodiment of a high-voltage transformer according to the present invention.

FIG. 2 is a sectional view of a first embodiment of a high-voltage transformer according to the present invention.

FIG. 3 is a partially enlarged view of a first embodiment of a bobbin used in a high-voltage transformer according to the present invention.

FIG. 4 is a partially enlarged view of a second embodiment of the bobbin used in the high-voltage transformer according to the present invention.

FIG. 5 is a perspective view of a second embodiment of the high-voltage transformer according to the present invention.

FIG. 6 is a perspective view of a second embodiment of the high-voltage transformer according to the present invention.

FIG. 7 is a partially enlarged view of a third embodiment of the bobbin used in the high-voltage transformer according to the present invention.

FIG. 8 is a partially enlarged view of a fourth embodiment of the bobbin used in the high-voltage transformer according to the present invention.

FIG. 9 is a perspective view of a third embodiment of the high-voltage transformer according to the present invention.

FIG. 10 is an exploded perspective view of a conventional high-voltage transformer.

FIG. 11 is an exploded perspective view of another conventional high-voltage transformer.

FIG. 12 is a sectional view of another conventional high-voltage transformer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 I-type core 2 E-type core 2a Middle leg 2b Side leg 2c Side leg 3 Bobbin 3a Flange 3b Hollow hole 3c Terminal embedding part 3d Partition 3e Partition wall 3f Hole 5 Primary winding 6 Secondary winding 7 Terminal 8 Terminal 11, 12, 13, 14, 15, 16, 17, 18 Convex part 32 E type core 32a Middle leg 32b Side leg 32c Side leg 33 Bobbin 35 Primary winding 36 Secondary winding 41 I-shaped core 42E Mold core 42b Side leg 42c Side leg 43 Primary bobbin 44 Secondary bobbin 45 Primary winding 46 Secondary winding

Claims (5)

[Claims] 1. A transformer using a magnetic core comprising an I-type core and an E-type core, wherein the transformer is provided in a hollow hole of a bobbin provided with a primary winding and a secondary winding. Attached, the E-shaped core is located above in the direction perpendicular to the winding axis direction of the bobbin, and facing the I-shaped core,
The outside of the hollow hole of the bobbin, the primary winding of the bobbin and 2
A high-voltage transformer, wherein the high-voltage transformer is formed by a hole penetrating a hollow hole of the bobbin provided on an upper surface of a partition wall between secondary windings. 2. The cross-sectional area of the middle leg of the E-shaped core is smaller than the cross-sectional area of another magnetic path forming the magnetic core of the transformer, and the middle leg of the E-shaped core is located on the left and right of the middle leg. 2. The high-voltage transformer according to claim 1, wherein the high-voltage transformer is not located at the center of the side leg of the E-shaped core. 3. The space between the middle leg of the E-shaped core and the side legs located on the left and right of the middle leg is close to the middle leg of the E-shaped core sandwiching the primary winding and the primary winding. 2. The high-voltage transformer according to claim 1, wherein a distance between the side legs of the E-shaped core is shorter than a dimension of the other side leg and the middle leg. 4. A bobbin having at least one projection extending along the extension of the bobbin from the flange of the coil bobbin or the terminal embedding portion in at least one of the extending directions of the hollow of the bobbin. 2. The high-voltage transformer according to claim 1, wherein: 5. A partition between a primary winding and a secondary winding of a bobbin has terminals for connecting the primary winding or the secondary winding. The high voltage transformer as described.