JPH05299271A - Leakage transformer - Google Patents

Abstract

PURPOSE:To obtain a leakage transformer small in breadth (perpendicular to lengthwise direction) and size as a whole. CONSTITUTION:A primary winding 13 wound on a bobbin 14 and a secondary winding 15 wound on bobbins 16 and 17 are provided, magnetically permeable projections 21 and 22 are arranged inside the air gaps located at the centers of the bobbins 14, 16, and 17, and a magnetic shunt projection 23 is arranged at both the sides of each gap as a dead space between the bobbins 14, 16, and 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic leakage transformer used as a ballast of a discharge lamp lighting device.

[0002]

2. Description of the Related Art Magnetic leakage transformers currently used in ballasts of discharge lamp lighting devices are integrally joined, for example, in a central opening of a winding portion of a primary winding and a secondary winding. Structure, in which two magnetic-convex protrusions that are opposite to each other and a magnetic-concentration protrusion that opposes each other through a gap at a position outside the winding portion of the primary and secondary windings are provided on the base of a pair of cores. Has become. Therefore, in such a magnetic leakage transformer, the magnetic force generated in the winding part of the primary winding by a constant voltage acts on the secondary winding via the core, and the voltage is applied to the winding part of the secondary winding. However, since the demultiplexing convex portion that has an appropriate magnetic resistance acts equivalently as the reactance of the secondary winding, the current value from this secondary winding is not affected by the load. Current will be output.

Therefore, here, the magnetic leakage transformer disclosed in Japanese Patent Laid-Open No. 3-166708 filed by the present applicant will be described as a prior art with reference to FIGS. 3 and 4. First, in the magnetic leakage transformer 1, as illustrated in FIG. 3, each of the primary winding 2 and the secondary winding 3 is formed by the annular winding portions 4 and 5 of the conductive wire. Then, the winding portion 5 of the secondary winding 3 is located on the outer peripheral portion of the winding portion 4 of the primary winding 2. A pair of ferrite cores 6 and 7 for holding the primary and secondary windings 2 and 3 from above and below are provided with a rectangular parallelepiped magnetism convex portion 9 at the central portion and both ends of the long plate-shaped base 8.
10 has a projecting shape, and a rectangular parallelepiped demultiplexing projection 11 is provided between these magnetically projecting projections 9 and 10. Therefore,
In this magnetic leakage transformer 1, a winding portion 4 of the primary winding 2 is arranged on a magnetic-conducting convex portion 9 at the center of the ferrite cores 6 and 7, and is located on the outer peripheral portion of the winding portion 4. The demultiplexing part 1
The winding portion 5 of the secondary winding 3 is arranged between the magnetic field winding 1 and the magnetic-convex convex portion 10. In the magnetic leakage transformer 1, as shown in FIG.
Are integrally joined by the magnetic-convex convex portions 10 at both ends, and the magnetic-conducting convex portions 10 at the central portion are slightly separated from each other in order to improve the adhesion. Further, in this magnetic leakage transformer 1, the demagnetization convex portion 11 is largely separated from the magnetic conducting convex portion 10 and the like, and the cross-sectional area thereof is also the magnetic conducting convex portion 9,
It has been reduced compared to 10.

In the magnetic leakage transformer 1 having such a structure, the magnetic force generated in the winding portion 4 of the primary winding 2 by the constant voltage causes the magnetic flux from the magnetic flux projecting portions 9 of the ferrite cores 6 and 7 to the base 8. Since the magnetic flux is transmitted to the magnetic-conduction convex portion 10 and the demagnetization convex portion 11 via the magnetic force, a voltage is generated in the winding portion 5 of the secondary winding 3 by the magnetic force. Then, in this magnetic leakage transformer 1, the demultiplexing convex portion 11 serving as a magnetic resistance equivalently acts as the reactance of the secondary winding 3, so that the primary winding 2
A constant current can be obtained from the secondary winding 3 by applying a constant voltage.

[0005]

In the magnetic leakage transformer 1 described above, if a constant voltage is applied to the primary winding 2, the secondary winding 3
Since a constant current can be obtained from the device, it can be used as a ballast of a discharge lamp lighting device.

However, in this magnetic leakage transformer 1, since the winding portion 5 of the secondary winding 3 is structurally located on the outer peripheral portion of the winding portion 4 of the primary winding 2, the ferrite core 6, The horizontal width of 7 is orthogonal to the longitudinal direction.

The present invention provides a magnetic leakage transformer having a small width and a small size as a whole.

[0008]

A secondary winding in which an annular winding portion of a conductive wire is provided with one primary winding, and two winding portions are adjacent to both sides of one winding portion of the primary winding. A winding is provided, and in the gap on both sides of the facing surface of the winding part of the primary / secondary winding and the magnetic flux convex part located in the center air gap of the winding part of these primary / secondary windings. The positioned demultiplexing convex portion is integrally projected on the long plate-shaped base of the ferrite core.

[0009]

[Function] Since the demultiplexing projections are located in the dead spaces that are inevitably formed on both sides of the facing surfaces of the winding portions of the primary and secondary windings,
The lateral width orthogonal to the longitudinal direction can be shortened, and the entire size can be efficiently reduced.

[0010]

Embodiments of the present invention will be described with reference to FIGS. 1 and 2. First, in the magnetic leakage transformer 12, as illustrated in FIG. 1, the primary winding 13 has one winding portion 14, but the secondary winding 15 has two winding portions 16 and 17. In this case, the winding parts 16 and 17 of the secondary winding 15 are located before and after the winding part 14 of the primary winding 13. And these primary and secondary windings 13 and 15
Pair of ferrite cores 18 and 19 for holding the
Has rectangular parallelepiped magnetic-convex protrusions 21 and 22 projecting from the central portion and both ends of the long plate-shaped base 20.
Triangular prism-shaped demultiplexing projections 23 are formed on both sides of the position between the first and second projections. Therefore, in this magnetic leakage transformer 12, the winding portion 14 of the primary winding 13 is arranged on the magnetic-convex convex portion 21 in the central portion of the ferrite cores 18 and 19.
The two winding parts 16 and 17 of the secondary winding 15 are arranged on the magnetic-convex convex parts 22 located before and after the winding part 14, respectively.

By doing so, in the magnetic leakage transformer 12, the winding portion 1 of the primary and secondary windings 13 and 15 is
4, 16 and 17 in the central air gap
22 is located and the primary and secondary windings 13 and 15 are
Since the demultiplexing convex portions 23 are located in the gaps on both sides of the opposing surfaces of the three winding portions 14, the three winding portions 14, 16 and 17 can be densely arranged in a line, and the entire winding portions are substantially the same as the ferrite cores 18 and 19. It has a shape.

The magnetic leakage transformer 12 shown in FIG.
, The ferrite cores 18 and 19 are integrally joined by the magnetic-convex convex portions 22 at both ends, and in order to improve the adhesion, the central magnetic-convex convex portion 22 is slightly separated. is doing. Also, in this magnetic leakage transformer 12,
The demagnetization convex portion 23 is largely separated from the magnetic conduction convex portion 22 and the like, and the cross-sectional area thereof is also the magnetic conduction convex portions 21 and 2.
It has been reduced compared to 2.

In such a structure, in the magnetic leakage transformer 12, the winding portion 1 of the primary winding 13 is driven by a constant voltage.
4 is transmitted from the magnetic-conduction convex portion 21 of the ferrite cores 18 and 19 to the magnetic-conduction convex portion 22 and the magnetic demultiplexing convex portion 23 via the base 20, so that the magnetic force exerts A voltage is generated in the winding parts 16 and 17 of the next winding 15.
Then, in this magnetic leakage transformer 12, the demultiplexing convex portion 23 that serves as an appropriate magnetic resistance acts equivalently as the reactance of the secondary winding 15, so that if a constant voltage is applied to the primary winding 13, the secondary winding 15 A constant current can be obtained from the winding 15.

In the magnetic leakage transformer 12, the winding portion 14 of the primary winding 13 and the winding portions 16 and 17 of the secondary winding 15 are structurally continuous in a line. Since the demultiplexing protrusions 23 are located in the triangular gaps that are inevitably formed on both sides of the facing surfaces of the turning portions 14, 16 and 17, the lateral width orthogonal to the longitudinal direction thereof is equal to that of the ferrite cores 18 and 19. Is becoming That is, in this magnetic leakage transformer 12, the winding portions 14, 16 and 17 of the primary and secondary windings 13 and 15 that are continuously adjacent to each other are wound in a rectangular shape in order to miniaturize the whole. , Even in this case, the winding parts 14, 16,
Since the four corners of 17 are inevitably cylindrical and have triangular gaps on both sides facing each other, by arranging the demultiplexing projections 23 in this dead space, the entire size can be made extremely efficient and compact.

In the magnetic leakage transformer 12 of this embodiment, a constant voltage is applied to the primary winding 13 to obtain a constant current from the secondary winding 15, but the present invention is limited to the above-mentioned form. However, it is also possible to supply a constant voltage to the secondary winding 15 to obtain a constant current from the primary winding 13.

[0016]

As described above, the present invention provides a primary winding having an annular winding portion of a conductive wire, and two winding portions are provided on both sides of one winding portion of the primary winding. Adjacent secondary windings are provided, and both sides of the facing surface of the winding portion of the primary and secondary windings and the magnetic flux convex portion located in the center air gap of the winding portion of these primary and secondary windings. Since the demultiplexing convex portion located in the gap of is integrally projected on the long plate-shaped base of the ferrite core,
Since the demultiplexing protrusions are located in the dead spaces that inevitably occur on both sides of the facing surface of the winding part of the primary and secondary windings, the lateral width orthogonal to the longitudinal direction is shortened and the entire size is efficiently reduced. It has the effect of being able to do so.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view.

FIG. 3 is a perspective view showing a prior art previously proposed by the applicant.

FIG. 4 is a vertical sectional side view.

[Explanation of symbols]

 12 Magnetic Leakage Transformer 13 Primary Winding 14, 16, 17 Winding Part 15 Secondary Winding 18, 19 Ferrite Core 20 Base 21, 22 Conducting Convex Part 23 Decoupling Convex Part

Claims (1)

[Claims] 1. An annular winding portion of a conductive wire is provided with one primary winding, and one winding of the primary winding is provided with a secondary winding having two winding portions adjacent to each other. , A magnetic flux convex portion located in the central air gap of the winding portion of these primary and secondary windings and a magnetic demultiplexing located in the gaps on both sides of the facing surface of the winding portion of the primary and secondary windings. A magnetic leakage transformer characterized in that a convex portion and a long plate-shaped base of a ferrite core are integrally projected.