JPS5812551Y2 - fly pack transformer - Google Patents

Description

[Detailed description of the invention] This invention relates to a flyback transformer used in high voltage generation circuits such as television receivers, and in particular divides a high voltage coil into multiple coil units and connects them via diodes. This invention relates to the structure of a flyback transformer that obtains stable high-voltage output by doing so.

A flyback transformer is generally constructed to generate a stable high voltage using a high-order harmonic tuning method.

In other words, in a television receiver, in addition to the inductance and resonance capacitance of the deflection yoke, the cage inductance between the low-voltage winding and high-voltage winding that forms the flyback transformer and the distributed capacitance on the high-voltage side are set to appropriate values. This facilitates the high-order harmonic tuning.

For this reason, recently, as shown in Fig. 1, the high voltage winding is divided into a plurality of coil units L1 to L4 using a plurality of diodes D1 to D4, and the distributed capacitance on the high voltage side is substantially reduced in appearance. is considered.

Considering each coil unit, this method is preferable from the standpoint of insulation, since the high voltage generated pulses are also small.

In this case, a so-called split bobbin, in which a winding groove is formed by a plurality of flanges, is generally used.

However, when split bobbins are used, there are drawbacks such as difficulty in increasing the capacitance between coil units sufficiently and difficulty in obtaining good tuning.

For this reason, a type of fly that does not use split bobbins constructs a high-voltage coil by winding each coil unit as a single winding layer on a cylindrical bobbin and then fitting these bobbins concentrically. A back transformer is proposed.

An object of the present invention is to provide a flyback transformer with an optimal structure for realizing the above configuration.

Hereinafter, the present invention will be explained in detail using embodiments of the drawings.

FIG. 2 is a perspective view showing the coil section of a flyback transformer embodying the present invention. As shown in detail in FIG. 3, high-voltage coil units L1 to L4 The high-pressure bobbins 2 to 5, each wound with a single winding layer, are successively fitted concentrically.

In addition, the high-voltage bobbin 5 on which the high-voltage coil unit) L4 is wound
A half-open cylindrical diode holder 6 with flanges 6a formed at both ends is fitted in a predetermined position.

In this diode holder, diodes D0 to D4 connected to each high voltage coil unit are arranged so as to short-circuit between the collars 6a.

In this case, the collar 6a functions to hold the lead terminal of the diode.

Further, a hole 6b and a groove 6C formed in the collar 6a accommodate and hold a high voltage lead wire (not shown).

High voltage coil units L1 to L wound around each high voltage bobbin
4 are drawn out from the ends of the high-voltage bobbin via lead wires and electrically connected to predetermined diodes.

Therefore, in the present invention, as shown in detail in FIG. 4, the ends of the high-pressure bobbins 2 to 5 are provided with protrusions 2a to 5a that protrude in the axial direction as lead wire pullout position regulating means. Each of the lead wires is drawn out through 2a to 5a.

In the flyback transformer of the present invention, the protrusions are arranged at positions where the lead wires of the high-voltage coil unit connected to the diode lead terminals are drawn out at a sufficient distance to obtain sufficient insulation distance (creeping pressure distance). In other words, each high pressure bobbin is engaged and integrated so that the protrusions 2a to 5a are located scattered in the circumferential direction.

Here, in the flyback transformer of the present invention, a plurality of protrusions 2b to 4b protruding in the radial direction are formed around the high-pressure bobbins other than the uppermost high-pressure bobbin. In addition to forming an appropriate interval between the two, the positional relationship with the high pressure bobbin fitted on the upper side is regulated.

Now, in FIG. 4, to explain the high pressure bobbin 3 and the high pressure bobbin 4, the high pressure bobbin 3 is formed with six protrusions 3b protruding in the radial direction for maintaining the interlayer distance. The high pressure bobbin 4 is held while forming an appropriate space between the high pressure bobbin 4 and the high pressure bobbin 4 fitted on the upper side.

A particular one of the protrusions 3b is also formed with a fitting protrusion 3C, and this fitting protrusion 3C is inserted into a fitting recess 4d formed at a predetermined position inside the high-pressure bobbin 4. By fitting them together, the positional relationship with the high pressure bobbins 3 and 4 is regulated.

That is, rotation is prevented.

In addition, a fitting recess 3d is formed on the inner surface of the high pressure bobbin 3 in order to fit the high pressure bobbin 2 therein, and a fitting recess 3d is formed in the inner surface of the high pressure bobbin 4 in order to fit the high pressure bobbin 5 therein. , a plurality of protrusions 4d are formed.

In the flyback transformer of the present invention, when the high-voltage bobbins around which the high-voltage coil unit is wound are concentrically fitted and integrated as described above, the lead wire draw-out position regulating means formed at the end of the high-voltage bobbins is formed at the end. In the relationship between a certain protrusion and the diode holder 6, the lead wires drawn out through the protrusion have a sufficient insulation distance, for example, so that the lead wires are parallel to each other and the distance between the wires is sufficiently large. It is configured so that the

In this case, considering that the lead wires drawn out from both ends of the high-voltage bobbin are connected to different diodes, the protrusions formed at both ends to restrict the lead wire drawing position are formed at predetermined intervals. It is something to keep.

In addition, in the device of the above embodiment, a device in which a protrusion protruding in the axial direction is formed as the lead wire pull-out position regulating means has been described, but if the lead wire pull-out position is restricted, the lead wire pull-out position The shape of the regulating means is not limited to the embodiment, and instead of protrusions, grooves may be formed, for example.

Since the present invention has the above-mentioned configuration, a sufficient insulation distance can be formed between the lead wires simply by fitting the high-voltage bobbin and integrating the fittings.

Therefore, it is extremely easy to construct a flyback transformer with almost perfect insulation between the node wires just by assembling it according to the work procedure, and this type of flyback transformer can have a highly reliable lead wire extraction configuration and the assembly work is easy. Extremely simplified.

[Brief explanation of the drawing]

Fig. 1 is a circuit configuration diagram of a flyback transformer to which the present invention is applied, Fig. 2 is a perspective view showing the coil section of the flyback transformer in which the present invention is implemented, and Fig. 3 is a side view of the same. FIG. 4 is a drawing for explaining the structure of the high-pressure bobbin in the flyback transformer of the present invention. In the figure, 1 is a low pressure bobbin, 2 to 5 are high pressure bobbins, 2a to 5
A indicates a lead wire draw-out position regulating means, and 6 indicates a diode holder.

Claims (1)

[Scope of utility model registration request] The high-voltage coil is divided into multiple high-voltage coil units via diodes, and each coil unit is wound around a cylindrical high-voltage bobbin, and these bobbins are fitted concentrically and stacked. In a flyback transformer in which a diode holder in which the diode is arranged is fitted, a lead wire pull-out position regulating means is formed at an end of each of the high voltage bobbins, and the lead wire pull-out position regulating means The flyback is characterized in that the high voltage bobbins are engaged and integrated so that the lead wires from the high voltage coil unit connected to the high voltage coil unit are drawn out at a distance sufficient to obtain a sufficient creepage pressure distance. Trance.