JPS5812550Y2 - flyback transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flyback transformer used in a high voltage generator such as a television receiver, and particularly to the structure of a rectifier holder thereof.

Recently, as a means of constructing a small, low-loss flyback transformer, the high-voltage coil, low-voltage coil, core, rectifier holder, terminal plate, etc. that constitute the flyback transformer are integrally molded with an insulating molding material.

A so-called integral mold type flyback transformer has been proposed.

However, when an integral mold type flyback transformer is actually produced in large quantities as a product, it is necessary to construct the flyback transformer itself into an appropriate structure.

The present invention has been made in view of the above points, and its purpose is to provide a flyback transformer with a structure suitable for an integral mold type, and in particular, the structure of its rectifier holder is characterized.

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

FIG. 1 is a front view showing the flyback transformer according to the present invention before being molded. In the face, 1 indicates a mouth-shaped core made of a magnetic material.

A low voltage coil 3 wound around a low voltage coil bobbin 2 and a high voltage coil 5 wound around a high voltage coil bobbin 4 are attached to a pair of opposing legs of this core 1.

A terminal plate 11 having terminal pins 10 erected thereon is attached to the low voltage coil bobbin 2.

The core 1 is formed into a mouth shape by combining a pair of U-shaped cores, and is held by a metal fitting 6 for holding the core and a rectifier holder 7, and is held by tightening with a bimata 8 and a nut 9. has been done.

Note that in this specification, the plate-like body on which the high-voltage rectifier circuit portion is arranged is referred to as a rectifier holder.

The rectifier holder 7 holds the core 1 as shown in detail in FIG.
It has a flat plate part 7a that comes into contact with the core leg part, and side parts 7b and 7b' formed at the ends of the flat plate part in the direction of the core legs. Fitting holes 7 c and 7 c are formed.

Then, by fitting the fitting protrusions 2e formed on the bobbin 2 into the fitting holes 7c, 7c as shown in detail in FIG. 3, the bobbin 2 and the rectifier holder 7 are engaged.

Note that the bobbin 2 is provided with a flange, and a U-shaped terminal plate 11 is attached to the flange so as to cover the bobbin 2.

The terminal plate 11 is provided with a fitting protrusion that protrudes in the opposite direction to the rectifier holder 7, and by inserting this into the engagement hole bored in the metal fitting 6, the bobbin 2 and the metal fitting 6 are indirectly engaged. .

The flat plate portion 7a of the rectifier holder 7 includes a high voltage rectifier 1.
2. Parts constituting the high-voltage rectifier circuit such as the high-voltage capacitor 13 (and the resistor 14 for current surge, if necessary) are arranged, and the lead wires of these parts are connected appropriately, and the side part 7b.

After being accommodated in the slit-like grooves 7d and 7d' formed in 7b', the inlets are fixed by heat-sealing.

Note that the four pillars 7e (although not necessarily four) formed on the flat plate part 7a are usually considerably smaller than high-voltage capacitors in terms of electrical characteristics and shape, as they are used as high-voltage rectifiers. It was formed taking into consideration that glass diodes of 200 to 300 mm would be used, and in order to prevent the glass diodes from coming into direct contact with the capacitor, the space above the flat plate part was made up of this hollow pillar and the side part, and the diodes were However, the container acts to divide the space into spaces that cannot be accommodated.

Further, the round holes 7f formed in the flat plate part 7a are for inserting the screws 8, and the round holes 7f are for inserting the screws 8, respectively.
b' separates it from the high-voltage component arrangement side.

On the outside of the side surfaces 7b and 7b' of the rectifier holder, a pair of mold fixing portions 7g are formed by extending a portion of the flat plate portion 7a.

Note that 7h is a housing part for a high-voltage lead wire that supplies the high-voltage output voltage of the high-voltage rectifier circuit to the anode, and a wedge-shaped convex part 7k that projects inward is formed at the end of the high-voltage lead wire. When housed, it sinks into the covering mold part and functions to hold it.

FIG. 4 shows a completed flyback transformer in which the internal structure of the flyback transformer shown in FIG. 1 is integrally molded with an insulating molding material 16.

The dividing surface of the molding die is set at the position indicated by the broken line XX.

The mold fixing part 7g provided on the rectifier holder 7 is supported by parts A and A in the lower mold (not shown) which is separated vertically in the drawing, and the upper mold supports the terminal pin 8 and the legs of the metal fitting 6. A measure has been taken to prevent the portion 6C from being molded.

The four oblong holes 71 formed in the flat plate part 7a of the rectifier holder are for allowing the injected mold resin to easily flow inside.

A decrease in the strength of the flat plate portion 7a due to the provision of the hole 71 is prevented by forming reinforcing side portions 7j, 7j' on sides perpendicular to the side portions 7b, 7b'.

The reason why this reinforcing side portion is formed in the opposite direction to the side surface portion with respect to the flat plate portion is because the molding die is connected to the high voltage lead wire 15.
This is because the insulating mold resin is injected and filled from a part of this divided part, and the injection of resin is carried out smoothly without the reinforced side becoming an obstacle. This is to make you feel better.

Although the flyback transformer of the present invention uses the rectifier holder as described above, the following beneficial effects can be obtained.

In other words, the protruding pillars divide the component placement space of the rectifier holder, ensuring the placement of high-voltage rectifier circuit components, and preventing components from coming into contact with each other. Even if the arrangement of parts is slightly misaligned when molding with a material, there is no risk of parts contacting each other and causing insulation failure.

In addition, by forming through holes in the flat plate part of the rectifier holder, the mold resin flows extremely well.
In addition to improving work efficiency, it is possible to prevent flyback transformer defects due to mold defects.

Furthermore, by forming the mold fixing part on the rectifier holder, it is extremely easy to fix the rectifier to the mold during molding, and the molding operation becomes simple.

As explained above, the flyback transformer of this invention is
This configuration is extremely suitable for constructing an integral mold type flyback transformer, and is extremely useful as a means of mass producing this type of flyback transformer, the demand of which will increase in the future.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a state before molding of a flyback transformer embodying the present invention, FIG. 2 is a drawing showing a rectifier holder in the flyback transformer shown in FIG. 1, and a is a top view; b is a front view, C is a side view, Fig. 3 is an assembly diagram showing the relationship between the rectifier holder, low voltage coil bobbin, terminal plate, and metal fittings in the flyback transformer shown in Fig. 1, and Fig. 4 is an assembly diagram of the present invention. 1 shows a flyback transformer according to the invention, in which a is a top view, b is a front view, and c is a back view. In the figure, 1 is a core, 2 is a low-voltage coil bobbin, 3 is a low-voltage coil, 4 is a high-voltage coil bobbin, 5 is a high-voltage coil, 6 is a metal fitting, 7 is a rectifier holder, 8 is a screw, 9 is a nut, 10
11 is a terminal pin, 11 is a terminal board, 12 is a rectifier, 13 is a diode, 14 is a resistor, 15 is a high voltage lead wire, and 16 is an insulating molding material.

Claims (1)

[Scope of utility model registration request] In a flyback transformer, a mouth-shaped core equipped with a low-voltage coil and a high-voltage coil is held between holding fittings and a rectifier holder, and the entire body is integrally molded with an insulating mold resin. It consists of a flat plate part that comes into contact with the core leg, a side part formed at the end of the flat plate part in the direction of the core leg, and a mold fixing part that protrudes outward from the side part, and the flat plate part has a molding part for distributing the mold resin. A through hole is formed, and a protruding column is provided to separate a space within the height of the protruding column and a space outside the height of the protruding column, and high voltage rectifier circuit components are arranged in the flat plate part separately in the space and fixed to the side surface part. The flyback transformer is characterized by: