JPS638094Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a high voltage generation transformer used in a low power transistor inverter or the like.

This type of high-voltage generating transformer is made of a small hollow bobbin made of resin, etc., and has a diameter of about 0.1 mm.
Obtained by winding and layering copper wires of mm or less.

A conventional high voltage generating transformer obtained through the above procedure is shown in FIG. In the figure, 1 is a hollow bobbin, and 2 is a copper wire, that is, a coil wire. Note that an iron bar core is inserted into the hollow portion 3. Further, the reason why the hollow bobbin 1 is divided into multiple stages is to minimize the interlayer voltage between each layer of the stacked coil wires. In other words, by dividing the bobbin 1 into multiple stages in this way and winding the coil wires in order from the first stage, it is possible to lower the line voltage and interlayer voltage of the overlapping coil wires at any location. It is. Needless to say, lowering the interlayer voltage of the coil wire prevents dielectric breakdown within the coil winding, so providing such stages is particularly important in transformers for high voltage generation.

As mentioned above, in the conventional transformer for high voltage generation, the hollow bobbin 1 is divided into multiple stages to prevent dielectric breakdown within the coil winding, but there are the following disadvantages. Therefore, it was not possible to sufficiently prevent dielectric breakdown.

That is, as mentioned above, the coil wire used in this type of high-voltage generating transformer is usually a thin wire of 0.1 mm or less, so the terminals are wired to some extent to make it easier to solder or to prevent disconnection at the lead outlet. It is necessary to make the wire thicker, but in this case, in the process of making the tip thicker, a protrusion is formed by the coil wire, and this protrusion has the disadvantage of causing an interlayer short circuit.

This will be explained with reference to FIGS. 2 and 3. FIG. 2 is a diagram illustrating the process of forming the terminal portion of the coil wire, and FIG. 3 is a diagram showing the state in which the coil wire is wound from the terminal portion to the first stage of the bobbin 1.

In Figure 2, to form a terminal part, the tip of the coil wire is usually layered several times (step A in the figure), and then twisted (step B in the figure) to form a thick terminal part. . These operations are usually performed mechanically, but the same procedures can be followed even if they are performed manually. In addition, 4 shown in the figure is a fixed pin for fixing one end of the coil wire, and 4 is a rotating pin for twisting.

The terminal formed through this process should preferably have no discontinuity in thickness from one single wire to the tip of a terminal made up of multiple wires, but in reality It is difficult to form such a terminal portion, and protrusions 5 as shown in FIG. 2B often appear.

When starting to wind a coil wire around the bobbin 1, the terminal section formed in the above procedure is inserted into the stepped section from the notch 6 of the end flange of the bobbin 1, as shown in Fig. 3, and the coil wire is wound. (A in the same figure shows a perspective view, and B in the same figure shows a front view.) The protrusion 5 may remain as it is, that is, remain facing upward. In this case, it is sufficient if the protrusion 5 is pushed downward by the second or several winding layers, but if the protrusion 5 remains in that state, between the first stages, the protrusion 5, a short circuit occurs or the dielectric breakdown voltage becomes too low. As a result, the overall quality of the transformer deteriorates, and after being incorporated into an inverter, it often malfunctions and destroys oscillation elements such as transistors.

The present invention was developed in view of the above circumstances, and the purpose is to provide a high voltage generation transformer that does not cause dielectric breakdown and can be produced at low cost by improving the structure of the transformer. do.

To achieve this objective, the configuration of the present invention is as follows:
It is characterized in that the number of turns in the first stage is smaller than the number of turns in the other stages.

FIG. 4 shows an embodiment of a high voltage generation transformer according to the present invention. Figure A shows its external view, and Figure B shows its cross-sectional view. As is clear from the figure, in this embodiment, the number of turns in the first stage is reduced, and the width a of this stage is made smaller than the widths of the other stages.

That is, the difference in configuration between the high voltage generation transformer shown in the figure and the conventional high voltage generation transformer shown in FIG. The point is that the number of turns of the coil wire 2 wound between the two is about several to several tens of turns.

With this configuration, the length of the coil wire wound between the first stages is significantly shorter than the overall coil wire length, so even if a short circuit occurs between these stages, the entire transformer circuit This means that the effect on this is almost negligible.

That is, the coil wire wound in the first stage of the transformer for high voltage generation according to the present invention does not have a functional purpose of generating high voltage by induction, but has a function of fixing the terminal portion.

From this, it follows that the width of the first stage is sufficient as long as it is wide enough to fix the terminal portion. Therefore, if the dimensions and other conditions permit it,
The width of the first stage is not particularly limited, and may be the same as the width of the other stages, for example. or,
Similarly, the number of turns of the coil wire wound between the stages may be sufficient as long as the number of turns is sufficient to fix the terminal portion.
The number of windings in the latter is 0.1 depending on the diameter of the coil wire.
For those with a diameter of mm or less, it is preferable to do it about 30 to 100 times.

As described above, according to the present invention, the transformer itself or the peripheral circuit can be easily removed by simply changing the number of turns of the coil wire without changing the structure of the bobbin compared to the conventional transformer. Since the damage to the transformer circuit can be prevented, and the effect on the entire transformer circuit due to the occurrence of a short circuit can be almost ignored, it can contribute to improving the quality and stability of the transformer as a whole. Furthermore, by reducing the width of the first stage, the overall size can be reduced.

Therefore, the high voltage generation transformer according to the present invention is suitable for use, for example, as a transformer for a DC-DC inverter or a high voltage generation transformer for a television.

[Brief explanation of drawings]

Figure 1 is an external view of a conventional high voltage generation transformer.
Figure 2 is a diagram explaining the process of forming the terminal part of the coil wire, Figure 3 is a diagram showing the state in which the coil wire is wound from the terminal part to the first stage of the bobbin, and Figure 4 is a diagram explaining the process of forming the terminal part of the coil wire. FIG. 3 is a diagram showing such a high voltage generation transformer. 1...Bobbin, 2...Coil wire, 5...Protrusion.

Claims (1)

[Claims for Utility Model Registration] A cylindrical bobbin divided into multiple stages by a flange, and a terminal portion formed by folding a coil wire multiple times at the beginning of winding, the bobbin having multiple stages. A transformer for high voltage generation characterized in that the coil wire is wound several times to several tens of times from above the terminal part in the first stage of the winding.