JPS591428Y2 - flybattuta transformer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flyback transformer that supplies high voltage to a cathode ray tube of a television receiver or the like.

A flyback transformer is generally configured to generate a high voltage using a so-called high-order harmonic tuning method.

In particular, in order to achieve high-order tuning of the 5th order or higher, a method has recently been considered in which the secondary winding is divided into multiple coil units using multiple diodes, and the distributed capacitance on the secondary side is essentially reduced in appearance. ing.

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

In particular, there are some coil units in which all coil units are wound in the same direction and a single winding layer has a 1,000-turn structure, which has a small interlayer distributed capacitance and exhibits excellent electrical characteristics.

However, since each coil unit is formed from a single winding layer, the number of turns is large, it is necessary to use an extremely thin wire material, and the winding width is also extremely large.

Therefore, when the respective coil units are stacked, there is a drawback that the impregnating material that insulates between each winding wire material or between layers is extremely difficult to penetrate.

That is, the product does not penetrate sufficiently to the middle of the coil unit, resulting in large variations in the product, and in some cases, dielectric breakdown may occur, which is extremely dangerous.

The present invention attempts to improve the flyback transformer of the above type.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a wiring diagram showing the configuration of a flyback transformer according to the present invention.

1 is the primary winding, 2 is the secondary winding, and the secondary winding 2 is
With four diodes D, D2, D3 and D4,
4 coil bobbins L-L,.

L2. It is divided into L3 and L4 and connected in series.

This specific configuration is illustrated in FIG. 2, which shows only the upper half of the winding part and omits other parts such as the core.

A secondary winding 2 is formed to overlap the primary winding 1 wound on a cylindrical bobbin 11.

Each of the coil units L1 to L4 is wound around a cylindrical coil bobbin 21 as a single winding layer.

As is clear from FIG. 3, several projections 22 are formed on the outer peripheral surface of the coil bobbin 21 at both ends thereof.

The protrusion 22 has a height slightly larger than the diameter of the winding wire forming the coil unit.

The edges of the protrusions are respectively joined to the inner circumferential surface of the coil bobbin of the next-stage coil unit disposed on the outside.

Therefore, a small space is formed between the winding layer of each coil unit and the next stage coil bobbin.

Further, on the outside of the coil unit L4 formed on the outermost periphery, each diode D1 is mounted on a support base 3 made of an insulating material.
to D4 are arranged in parallel.

Details of this are shown in FIG.

Lead wires 41 to 44 drawn out from the respective coil units are connected to each diode.

The lead wires 41 to 44 are each drawn out from between several protrusions 22.

These lead wires are omitted in FIG.

Incidentally, FIG. 4 shows another embodiment in which several protrusions 22a are further provided on the middle side of the coil bobbin 21.

This configuration is effective in maintaining uniform spacing between the coil units when the coil bobbin is made of thin material.

FIG. 5 shows still another embodiment, in which the protrusion of the coil bobbin located at least in the middle is formed on the outer peripheral surface at one end and on the inner peripheral surface at the other end, and is formed on the innermost surface. It is formed only at one end of the circumferential and outermost coil bobbins.

In these embodiments, a retaining means such as a protrusion or a groove can be provided at the end of each protrusion 22 and the opposing portion of the coil bobbin 21, respectively.

The secondary winding 2 assembled as described above is subjected to well-known impregnation molding together with the primary winding 1 and a core (not shown) for insulation.

The impregnating material easily penetrates into the spaces between the layers formed by the protrusions of each coil bobbin, and provides insulation between the wound wire materials and between the layers.

5 indicated by a dashed line is this impregnated molding material.

As described above, the flyback transformer of the present invention consists of a primary winding and a secondary winding that is divided into a plurality of coil units by a plurality of diodes, and each coil unit is wound in the same direction to make a single coil unit. In a flyback transformer formed in one winding layer, several protrusions having a height slightly larger than the diameter of the winding wire are provided on the end face of each coil bobbin around which each coil unit is wound,
While stacking the coil bobbins sequentially through the protrusions,
Diodes are arranged in parallel on the outside of the coil unit on the outermost periphery of the coil unit via a support stand, and the lead wires of each coil unit connected to the diodes are drawn out from between the protrusions provided on the coil bobbin. Although it is a flyback transformer that requires many windings of extremely thin wire, the winding width is extremely wide, and the interlayer gap is extremely small, the provision of protrusions on the coil bobbin ensures sufficient impregnation between each coil unit. Molding is carried out, and the insulation between the wound wire materials and each layer is completely achieved, and the high performance of the flat-wound coil unit system, with small interlayer distributed capacitance and excellent electrical properties, is fully maintained. be able to.

In addition, since each coil unit can be wound individually,
Winding time can be significantly reduced.

Furthermore, even though the lead wire must be drawn out for each coil unit, stable drawing operation is possible by using each protrusion provided on the coil bobbin as a guide, and the connection of the lead wire to the diode is also possible using the diode. Coupled with the fact that they are arranged in parallel on the outside of the outermost coil unit via a support stand, this can be done efficiently.

If each protrusion is provided with a means for securing the coil bobbin in the next stage, the practical effects are extremely large, such as maintaining the positional stability of each stacked coil unit.

In the flyback transformer of the present invention, the number of diodes and coil units, the number of protrusions provided on the coil bobbin, etc. are not limited to the thin tubes in the embodiment, and can be increased or decreased as appropriate.

[Brief explanation of drawings]

Figure 1 is a wiring diagram of the flyback transformer according to the present invention.
FIG. 2 is an explanatory view of the main part showing its specific structure, FIG. 3 is a side view thereof, and FIGS. 4 and 5 are explanatory views of the main part structure showing other embodiments. 1...Primary winding, 2...Secondary winding, 2
1... Coil bobbin, 22... Protrusion,
LI to L4... Coil unit, Dl to D
4...Diode.

Claims (1)

[Scope of utility model registration request] A flyback consisting of a primary winding and a secondary winding divided into a plurality of coil units by a plurality of diodes, and each coil unit is wound in the same direction and formed into a single winding layer. In the transformer, several protrusions having a height slightly larger than the diameter of the winding wire are provided on the end face of each coil bobbin around which each coil unit is wound, and the coil bobbins are sequentially stacked via the protrusions, The diodes are arranged in parallel on the outside of the outermost coil unit of the coil unit via a support stand, and the lead wires of each coil unit connected to the diodes are drawn out from between protrusions provided on the coil bobbin. The flyback transformer is characterized by: