JPS6012248Y2 - Flyback transformer device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flyback transformer device used in television receivers and the like.

FIG. 1 shows a circuit connection diagram of a flyback transformer device to which the present invention is directed, and 1 is a transformer section consisting of a low voltage coil 2 and a high voltage coil 3.

4 is a voltage doubler circuit that doubles and rectifies the high voltage generated in the high voltage coil 3, and includes a capacitor 5 connected as shown in the figure.
8 and a diode 6.7.

Conventionally, in a flyback transformer device that boosts the voltage using such a voltage doubler circuit 4, the transformer section 1 and the voltage doubler circuit 4 are generally separately molded in resin, and the two are connected by an external lead wire. However, this is not preferable because it increases the size of the flyback transformer as a whole, increases its weight, and increases the installation area and costs.

Therefore, it has been proposed to integrally mold the transformer section 1 and the voltage doubler circuit 4 with resin.

In a flyback transformer device in which a coil is wound around a split-type high-voltage coil bobbin having a plurality of grooves, as shown in FIG. A low-voltage coil bobbin 11 wound with a low-voltage coil is arranged in the core 12.
Insert the monopod 13 into the core 12°1 using the metal fitting 14, etc.
3 is fixed to form the transformer part 1, and if the components 5, 6.8 of the voltage doubler circuit 4 are placed on the collar 15 at the end of the low voltage coil bobbin 9, space efficiency can be further improved. This can contribute to miniaturization.

However, the flyback transformer device shown in Figure 2 assembled in this way is fixed inside a mold, and injection molding (pressurization, heating, and curing) is carried out by applying highly viscous liquid insulating resin at high pressure. As shown in FIG. 3, which also shows the appearance of the resin 16 during the process, the resin flow (
Due to the flow having a pressure of 30 to 9/Cl11 to 80 kg/cJ, the parts 5 and 6.8 on the flange 15 are tilted or misaligned, causing contact between the parts and disconnection at the connection part, resulting in a flyback transformer. This will seriously damage the reliability of the system.

The present invention provides a flyback transformer device with a structure designed to avoid such inconveniences.

That is, as shown in FIG. 4, the present invention includes a hole 20 through which the first leg 12a of the magnetic core 12 is inserted, and a hole 20 that is continuous with the hole 20 and extends in a direction perpendicular to the first leg 12a. The holder 17 has an engaging portion 23 that engages with a part of the second extending leg 12b, and a plurality of recesses 18 and 19 in which radial components among the plurality of components constituting the voltage doubler circuit are housed. The holder 17 is provided on the end face flange 15 of the molded high-voltage coil bobbin 9, and the holder 17 fixedly holds the respective parts in positions spaced apart from each other. Recesses 18 and 19 are provided to accommodate the capacitors 5 and 8, which are easy-to-fit radial components, and only the capacitor 5.8 is fixed, and the diode 6.7 is not directly held by the holder 17, but the capacitor Since 5.8 is held fixed, diode 6
The effect is also widespread, and there is no problem because axial components such as this diode 6 generally have little resistance to resin pressure.

The diode 7 is housed in the groove 10 of the high-voltage coil bobbin 9 where no coil is provided, as in the conventional case, but in this case as well, there is no problem because the diode 7 is placed in a state where there is not much resistance to the flow of the resin.

Note that one end of the other diode 6 is soldered 21 to the metal fitting 14.

Since the metal fitting 14 is connected to a grounding copper foil of a printed wiring board (not shown) through a terminal piece 22, one end of the diode 6 is connected to the ground by the soldering 21.

The holder 17 is provided continuously with a hole 20 through which the first leg 12a of the magnetic core 12 is inserted, and is engaged so as to sandwich a part of the second leg 12b extending in a direction perpendicular to the first leg 12a. Since the engaging portion 23 is provided, the holder 1
The end face flange 15 of the coil bobbin 9 is also compressed by resin pressure.
It won't slip off the top.

Further, the holder 17 can be molded integrally with the high-voltage coil bobbin 9, but in that case, the shape of the mold becomes complicated, so it is preferable to mold it separately from the high-voltage coil bobbin 9.

As described above, according to the present invention, the components constituting the voltage doubler circuit are fixedly held by the holder 17 on the flange of the end face of the coil bobbin 9, in other words, on the end face flange 15 of the coil bobbin 9 and the coil bobbin. The first leg of the core 12 to be inserted is arranged in a space that inevitably occurs,
Since space is used effectively, a voltage doubler circuit can be installed without increasing the size of the flyback transformer.

Also, when applying insulating resin using the injection molding method, the resin 1
The position of the component parts 5.6, 7.8 does not change due to the pressure of the flow of 6, and the holder 17 itself does not move.

Therefore, parts may come into contact with each other inside the mold resin,
There will be no disconnection at the connection.

Further, since the holder 17 has recesses 18 and 19 for accommodating only the capacitors 5 and 8, it is easy to manufacture and costs can be reduced.

As described above, according to the present invention, it is possible to obtain a small and highly reliable flyback transformer, which is extremely effective.

[Brief explanation of drawings]

FIG. 1 is a circuit connection diagram of a flyback transformer device, and FIGS. 2 and 3 are explanatory diagrams of the prior art. FIG. 4 is a perspective view of a flyback transformer device embodying the present invention before resin molding, and FIG. 5 is an explanatory view thereof. 1...Transformer part, 3...High voltage coil, 5, 8...Capacitor, 6,7...
Diode, 4... Voltage doubler circuit, 9...
High voltage coil bobbin, 11...Low pressure coil bobbin, 10...Groove, 12.13...Core,
15... End face tsuba.

Claims (1)

[Scope of utility model registration request] A split-type high voltage coil bobbin having multiple grooves around which a high voltage coil is wound and a low voltage coil bobbin around which a low voltage coil is wound are combined and attached to the first leg of the magnetic core to form a transformer part. In a flyback transformer device in which the components of a circuit that doubles the output voltage of the transformer section are integrally molded in a mold by injection molding in which a high-viscosity insulating resin is applied at high pressure, the first leg of the magnetic core a hole through which the voltage doubler is inserted; a retaining portion that is provided continuously with the hole and engages with a portion of the second leg extending in a direction perpendicular to the first leg; and a plurality of A holder having a plurality of recesses for storing radial parts among the parts is provided on the end face flange of the split type high pressure fill bobbin,
A flyback transformer device, characterized in that each of the parts is fixedly held at a position spaced apart from each other by the holder.