JPH063771B2 - Flyback transformer - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a flyback transformer for supplying a high voltage to a cathode ray tube.

2. Description of the Related Art A conventional flyback transformer is provided with a low voltage winding 1 and a heater winding 2 on the input side, and an output winding 3, rectifying diodes 4, 5, 6 and a capacitor 7 on the output side as shown in FIG. Was provided, and as a specific configuration, it was configured as shown in FIG.

That is, a magnetic core 9 made of U, I type ferrite or the like is incorporated in the split bobbin 8 around which the various windings 1, 2 and 3 are wound, and the rectifying diodes 4 to 6 are provided on the upper surface of the split bobbin 8.
The printed circuit board 11 incorporating the capacitor 7 and the high voltage lead wire 10 is connected and fixed using the terminal pins 12 implanted in the split bobbin 8, these are housed in the insulating case 13, and the shield case 14 is provided on the outer periphery thereof. It was covered and the terminal pin 12 and the high voltage lead wire 10 were drawn out from the insulating case 13.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the flyback transformer having the above configuration, each winding 1
Rectifying diode 4 to a split bobbin 8 wound with 3 to
6, the capacitor 7, and the high-voltage lead wire 10 mounted on the printed circuit board 11 are connected and fixed by using the terminal pins 12, and this is assembled in the insulating case 13. At this time, the tip of the high voltage lead wire 10 is passed through the lead wire insertion hole 15 of the insulating case 13, the printed circuit board 11 is joined, and the split bobbin 8 incorporating the magnetic core 9 is incorporated into the insulating case 13, and finally. Since the assembly method was completed by incorporating the shield case 14, it was difficult to automate the assembly, and the components for rectifying and smoothing were incorporated on the printed circuit board 11 and placed on the split bobbin 8. However, the size in the height direction becomes large, which is disadvantageous in terms of thinning.

The present invention eliminates the above-mentioned conventional drawbacks, and an object of the present invention is to provide a flyback transformer that can be automatically assembled and can be thinned.

Means for Solving the Problems In order to solve the above problems, the present invention has a low-voltage winding, a heater winding, and a high-voltage winding wound with upper and lower flanges having terminal pins and an upper flange holding a high-voltage rectifying component. The main body of the transformer is configured to contain the magnetic core in the bobbin, and the main body of the transformer is stored in the main body, and the rectifying and smoothing parts connected to the high voltage winding of the main body of the transformer are individually stored and fixed. A plate-shaped wiring body in which only the high-voltage lead wires for electrically connecting the terminal pins of the transformer body and various rectifying / smoothing components are connected to the provided insulating case and the transformer body / rectifying / smoothing components housed in the insulating case. And an upper lid that is incorporated into the opening side of the insulating case to press and fix the transformer body and the like to the insulating case.

Operation With the above configuration, the assembly is remarkably facilitated, the automatic assembly is facilitated, and the thickness can be reduced.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings 1 to 9.

In FIG. 1 to FIG. 9, 21 is a split type bobbin formed of synthetic resin, and terminal pins 24 are planted on the upper and lower flanges 22 and 23 of the bobbin 21. Also,
A magnetic core guide groove 25 is provided in a part of the upper and lower flanges 22 and 23 as shown in FIG.
High-voltage diode 2 which is a high-voltage rectifier part on the upper surface of the
A semi-circular component mounting recess 27 for accommodating 6 is formed, and lead grooves 28 are formed on both sides of the component mounting recess 27 for inserting the lead wire 26a of the high voltage diode 26 and bending the lead wire 26a upward. There is. A winding 29 such as a low-voltage winding, a heater winding, and a high-voltage winding is wound around the bobbin 21, and the lead wire of these windings 29 is a predetermined terminal pin 24.
It is connected to the. A magnetic core 30 made of U-shaped ferrite or the like is incorporated in the bobbin 21 provided with the winding 29 to form a transformer body.

The transformer body is housed in the transformer body housing recess 32 of the insulating case 31 made of an insulating material such as synthetic resin.
As shown in FIG. 6, a terminal hole 33 for projecting the terminal pin 24 provided on the lower end collar 23 of the bobbin 21 to the bottom surface of the insulating case 31 is provided on the bottom surface of the transformer body accommodating recess 32, and the lower surface of the magnetic core 30 is positioned. Magnetic core regulation rib 3 to regulate
4 are formed. Further, the transformer main body accommodating recess 32 has a size corresponding to the outer shape of the bobbin 21 to control the position of the bobbin 21.

Furthermore, the transformer body housing recess 3 of the insulating case 31
At a position adjacent to 2, a component storage recess 36 for storing a low voltage diode 35 which is a low voltage rectifying component and a component storage recess 38 for storing a capacitor 37 such as a film capacitor which is a smooth component are formed. The component storage recess 36
As shown in FIGS. 5 and 6, a plurality of retaining ribs 39 for fixing the low voltage diode 35 are formed on the upper end of the inner wall of the low pressure diode 3.
5 is provided with a lead wire hole 40 that penetrates the lead wire 35a. Further, a plurality of holding ribs 41 are formed in the height direction on the inner wall of the component housing recess 38 so as to be in pressure contact with both side surfaces of the housed capacitor 37.

In addition, the transformer body housing recess 32 of the insulating case 31
A U-shaped guide groove 42 is formed at the upper end of the portion continuous with the outer case of the insulating case 31.

A transformer body in which the high-voltage diode 26 is incorporated in such an insulating case 31, a low-voltage diode 35, and a capacitor 3
7 has a terminal body 24 located on the upper surface of the transformer body, a connection hole 43 into which the lead wire of each component is fitted, and a wiring body 44 made of a printed circuit board having a predetermined wiring pattern. It is built in and connected by soldering. A high voltage lead wire 45 for extracting a high voltage is connected to the wiring body 44, and the high voltage lead wire 45 is a third wire.
As shown in FIG. 4 and FIG. 4, the insulating case 31 is drawn out through the guide groove 42.

An upper lid 4 made of synthetic resin is provided on the upper surface of the insulating case 31.
6 is covered. The lower surface of the upper lid 46 is shown in FIG.
As shown in (c), a magnetic core restricting rib 47 that fits with the outer periphery of the upper part of the magnetic core 30 to restrict the position is formed, and a pressing protrusion 48 that presses the center of the upper surface of the magnetic core 30 is provided, and Fusing ribs 49 that are fused to the insulating case 31 are provided on the outer peripheral edge portion. In addition, a lead wire fixing protrusion 50 that fits in the guide groove 42 into which the high voltage lead wire 45 is fitted and fixes the high voltage lead wire 45 is provided in a part of the upper lid 46.

And the shield case 51 is covered on the whole. The shield case 51 is provided with an engagement hole 52, and is engaged with the engagement piece 53 of the insulating case 31 to be coupled.

Assembling will be described with the above configuration. First, various winding wires 29 are wound around the bobbin 21, the lead wires thereof are connected to predetermined terminal pins 24, and the component mounting concave portion 27 provided on the upper surface of the upper end collar 22 of the bobbin 21 is fitted into the component mounting recess 27 shown in FIG. (b)
As shown in FIG. 4, by inserting the high voltage diode 26 in which the lead wire 26a is drawn out in the axial direction and by fitting the lead wire 26a into the lead groove 28, the lead wire 26a
a is bent upward and assembled.

Then, the U-shaped magnetic core of the magnetic core 30 is fitted into the transformer main body accommodating concave portion 32 of the insulating case 31 in accordance with the magnetic core restricting rib 34, and then the bobbin 21 having the winding 29 is assembled. The I-shaped magnetic core is incorporated through the
Store and hold 7. At this time, one of the lead wires 35a of the low-voltage diode 35 projects on the bottom surface of the insulating case 31 and the other projects upward, and the lead wire 37a of the capacitor 37 is led out in the radial direction and is entirely led out.

After such a transformer body and various rectifying and smoothing components are assembled, a wiring body 44 made of a printed board to which a high-voltage lead wire 45 is connected is incorporated into the connection hole 43 so that the terminal pins 24 and component lead wires are inserted. Then, the upper lid 46 is aligned and incorporated onto the upper lid 46, and the fusion rib 49 is fused by ultrasonic waves or the like to be coupled to the insulating case 31, and the shield case 51 is covered thereover to form the flyback transformer. Finalize.

As described above, the assembling can be performed simply by sequentially assembling the insulating case 31 from above, so that the assembling can be easily automated.

Although a printed circuit board is shown as the wiring body 44 in the above-described embodiment, a metal body punched in a pattern or an assembly of connection lines may be used, and the insulating case 31 may be used. Depending on the space, a recess for accommodating the high-voltage diode 26 may be provided, or the capacitor 37 may be arranged on one side surface of the bobbin 21 and incorporated in the recess 32 for accommodating the transformer body.

Further, although the high-voltage lead wire 45 is used to apply a high voltage to the anode, the terminal pin may be drawn out from the wiring body 44.

Effects of the Invention Since the flyback transformer of the present invention is configured as described above, assembly can be performed from one direction, automation can be facilitated, quality can be stabilized, and various rectifications can be made around the transformer body. Since a plate-shaped component is used that has smooth parts built-in and only the high-voltage lead wires are connected as the wiring body without mounting electronic parts, the overall thickness can be reduced, and the parts storage recess can be achieved. The lead wire of the rectifying / smoothing component housed in can also be effectively used as an output terminal and a connection terminal, which is of great industrial value.

[Brief description of drawings]

1 is an exploded perspective view showing an embodiment of the flyback transformer of the present invention, FIG. 2 is the same perspective view, and FIG. 3 is the same sectional view.
FIG. 4 is an exploded perspective view of the main part, FIG. 5 is a top view of the main part, and FIG. 6 is a top view of an insulating case used for the transformer.
FIG. 7 is an exploded perspective view of essential parts showing the relationship between the magnetic core and the upper lid, and FIGS. 8 (a) to (c) are bottom views, side views and sectional views of the essential portions of the upper lid, and FIG. 9 (a). , (B) are perspective views showing the assembly of the bobbin and the high voltage diode, FIG. 10 is an electric circuit diagram of a general flyback transformer, and FIG. 11 is a sectional view of a conventional flyback transformer. 21 ... Bobbin, 22, 23 ... Tsuba, 24 ... Terminal pin, 26 ... High-voltage rectifying component, 26a ... Lead wire, 27
...... Component mounting recess, 28 ...... Lead groove, 29 ...... Winding,
30 ... Magnetic core, 31 ... Insulating case, 32 ... Transformer main body storage recess, 33 ... Terminal hole, 34, 47 ... Magnetic core restricting rib, 35 ... Low-voltage rectifying component, 36 ... Component storage recess, 37 ... … Smooth parts, 38 …… Parts storage recesses, 39…
... retaining rib, 40 ... lead wire hole, 41 ... holding rib, 42 ... guide groove, 44 ... wiring body, 46 ... upper lid, 48 ... pressing protrusion, 49 ... fusion rib, 51 ...... Shield case.

Claims (1)

[Claims] 1. A transformer main body constructed by winding a low-voltage winding, a heater winding, and a high-voltage winding, having terminal pins on upper and lower flanges and having a high-voltage rectifying component on an upper flange, and incorporating a magnetic core into the bobbin. An insulating case provided with a recess for accommodating the position of the transformer main body, an accommodating recess for accommodating and fixing individual rectifying and smoothing components connected to the high-voltage winding of the transformer main body, and a transformer accommodated in the insulating case. Installed on the main body and rectifying / smoothing parts, the plate-shaped wiring body to which only the high-voltage lead wires that electrically connect the terminal pins and various rectifying / smoothing parts of this transformer body are connected, and the transformer body is installed on the opening side of the insulating case. A flyback transformer that consists of an upper lid that presses and fixes the transformer body etc. to the insulating case.