JPH0244704A - Converter transformer - Google Patents

Abstract

PURPOSE:To suppress the heat generation of a converter transformer and to reduce its temperature by providing a thick substantially crest-shaped part at the center of a cylindrical winding core of a coil bobbin. CONSTITUTION:A coil 13 is wound on a winding core provided with a thick substantially crest-shaped part 17 at the center of the winding width of a coil bobbin 12 having collars at least at both ends, and an insulating tape 14 is wound thereon. Works of winding the coil 13 and the tape 14 are repeated several times, a gap 15 is eventually provided between cores 11, and in order to further equalize the winding space in the thick part of the bobbin 12, the core 11 having a swell on the outer periphery is associated with both outer magnetic legs. Thus, since the thick part 17 of the winding core of the bobbin 12 is increased in thickness, a leakage magnetic flux generated from a gap 15 between the cores scarcely affects the coil to suppress the heat generation of the coil and to thus reduce the temperature of a whole converter transformer.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a converter transformer used in various video equipment, industrial equipment, and the like.

BACKGROUND OF THE INVENTION In recent years, converter transformers have become higher in frequency and smaller in size, but with this comes the issue of reducing temperature rise, and countermeasures are also required.

A conventional converter transformer will be explained below.

FIG. 4 shows an exploded perspective view of a conventional magnetic core and bobbin. Further, FIG. 5 shows the structure of a conventional converter transformer, and FIG. 6 shows the relationship between the leakage magnetic flux and the coil. 4 to 6, 1 is an EX type magnetic core, 2 is a coil bobbin, 3 is a coil, 4 is an insulating tape, and 5 is a gap between the magnetic cores 1. In FIG. This shows the magnetic flux. The structure is such that a coil 3 is wound around the winding core of a coil bobbin 2, and an insulating tape 4 is wound thereon to insulate the next coil 3. The work for the coil 3 and the insulating tape 4 is repeated several times, and finally the magnetic cores 1 with a gap 5 between the magnetic cores 1 are assembled.

Regarding the converter transformer configured as above,
The operation will be explained below.

First, when the converter transformer is working as shown in FIG. The heat generated by coil 3, which was affected by
This greatly affected the heat generation of the entire converter transformer.

Problems to be Solved by the Invention However, in the above conventional configuration, the distance between the coil 3 wound around the bobbin 2 and the gap 5 between the magnetic core 1 is easily affected by leakage magnetic flux 6 if the distance between the coil 3 wound around the bobbin 2 and the gap 5 between the magnetic cores 1 However, there was a problem in that the heat generation of No. 3 increased and the temperature of the converter transformer became extremely high. In addition, in order to lower the temperature of the converter transformer, it is generally necessary to lower the DC resistance of the copper wire, but for this purpose, it is necessary to increase the conductor cross-sectional area of the copper wire 9, wire suitable for high frequency, or use wire such as knot wire. Must. In addition, magnetic cores with high magnetic permeability must be used, but when they are used,
Another problem was that the cost was high.

The present invention solves the above-mentioned conventional problems, and it is possible to prevent the leakage magnetic flux from being affected by the coil, and also to reduce the cost by eliminating the need to use a variety of materials. The purpose is to provide a converter transformer that can

Means for Solving the Problems In order to solve the problems, the converter transformer of the present invention has a substantially chevron-shaped thick part formed in the winding core of a cylindrical coil bobbin, the inner thickness of which is thicker at the center than at both ends. In addition, the outer magnetic legs of the magnetic core have a bulge on the outer peripheral surface so that they can be fitted with the coil bobbin without any problem and space for coil winding can be secured.

Effect: With this configuration, the leakage magnetic flux generated from the gap between the magnetic cores is prevented from affecting the coil because the approximately chevron-shaped inner thickness at the center of the winding core of the coil bobbin is thickened.
The heat generation of the coil can be suppressed, and the temperature of the entire converter transformer can also be lowered.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 2 shows an exploded perspective view of the magnetic core and bobbin used in the present invention. Further, FIG. 1 shows the structure of the converter transformer of the present invention, and FIG. 3 shows the relationship between leakage magnetic flux and the coil. In FIGS. 1 and 2, 11 is an EE type magnetic core made of ferrite or the like, 12 is a coil bobbin with flanges at least at both ends, 13 is a coil, 14 is an insulating tape, 16 is a gap between the magnetic cores 11,
Reference numeral 17 indicates a substantially chevron-shaped thick portion in the winding core portion of the coil bobbin 12, where the center portion is thicker than both ends.
In the figure, 16 indicates leakage magnetic flux. The structure is similar to the conventional one, and the coil 13 is wound around the winding core portion of the coil bobbin 12, which has a substantially chevron-shaped thick wall portion 17 at the center of the winding width, and an insulating tape is applied on top of it to insulate it from the next coil 13. 1
Roll 4. The coil 13 and insulation chi 1140 operations are repeated several times, and finally a gap 16 is created between the magnetic cores 11, and in order to equalize the winding space by increasing the thickness of the coil bobbin 12, amphoteric magnetic legs are placed on the outer peripheral surface. A magnetic core 11 with a bulge is incorporated.

Regarding the t-converter transformer configured as above,
The operation will be explained below.

First, according to this embodiment, since the winding core of the coil povi 712 is provided with the substantially chevron-shaped thick part 17 with a thick center part, even if the leakage magnetic flux 16 is generated and filled, the coil 1
3 is set to arrive quickly. for example,
Previously, the leakage magnetic flux 16 affected most of the coils at the bottom, so the heat generation in the coils at the bottom was very large. However, in the present invention, in order that the leakage magnetic flux 16 hardly affects the lowermost coil, a substantially chevron-shaped thick portion 17 with a thick center portion is provided in the winding core portion of the coil bobbin 12, and a substantially chevron-shaped thick portion 17 is provided in the central portion of the winding core portion of the coil bobbin 12. If the thickness is increased by the amount corresponding to the winding height of the coil and the waveform is the same as that of the leakage magnetic flux 16, the distance from the center of the gap to the coil 13 will be long, and the coil 13 will be able to resist the influence of the leakage magnetic flux 16. Therefore, if the amount of leakage magnetic flux 160 generated is the same, the leakage flux that was previously applied to the entire bottom coil will be increased by the thickness corresponding to the winding height of the bottom coil, resulting in leakage. Since the area that the magnetic flux 16 exerts on the coil 13 is very small, the heat generation of the lowest coil is very small.
The temperature of the entire converter transformer can also be lowered.

Effects of the Invention As described above, the present invention suppresses the heat generation of the converter transformer and lowers the temperature by providing the thick walled portion in the central part of the cylindrical winding core of the coil bobbin in the shape of a substantially chevron. can. In addition, high-cost materials currently in use are used, such as copper wire with a larger conductor cross-sectional area used to lower the temperature of the converter transformer, Lindt wire suitable for high frequencies, and magnetic cores with high magnetic permeability. I don't have to do it,
This makes it possible to realize an excellent converter transformer that is economical in terms of cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the converter transformer of the present invention, Fig. 2 is an exploded perspective view of the magnetic core and coil bobbin used in the present invention, and Fig. 3 is leakage magnetic flux of the converter transformer b according to the present invention. Fig. 4 is a perspective view of the magnetic core and coil bobbin of a conventional converter transformer, Fig. 6 is a sectional view showing the structure of a conventional converter transformer, and Fig. 6 shows the leakage magnetic flux and FIG. 3 is an explanatory diagram showing the relationship between coils. 11... Magnetic core, 12... Coil bobbin, 13... Coil, 14... Insulating tape, 16... Gap between magnetic cores, 16・・・・・・
...Leakage magnetic flux, 17...Thick walled part of approximately chevron shape. Name of agent: Patent attorney Shigetaka Awano and one other person 111
2 Figure 1 Figure Figure

Claims (1)

[Claims] A coil bobbin with flanges on at least both ends and a cylindrical winding core around which a winding is wound.The coil bobbin covers the entire outer circumferential surface of the winding core, and is thicker at the center than at both ends. A converter transformer that incorporates a magnetic core that forms a thick part of the outer magnetic leg and has a bulge on the outer peripheral surface of the outer magnetic leg.