JPS5938026Y2 - flyback transformer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a flyback transformer, particularly a type that is attached to a board, which improves insertability into a printed circuit board and prevents the core from rattling.

In conventional flyback transformers, a wedge is inserted between the core and the low-voltage bobbin around which the coil is wound to hold the coil in the core.

Furthermore, the fixing plate provided in contact with the side surface of the core was indirectly positioned with respect to the coil by tightening the core.

However, in a flyback transformer having such a configuration, it is difficult to position the coil and the core coaxially in order to insert the wedge into a part of the gap between the low-pressure bobbin and the core.

Therefore, when attaching a flyback transformer to a printed circuit board, the ease of inserting the flyback transformer into the board is extremely poor, and the workability of inserting a wedge is also poor.

The object of this invention is to eliminate the above-mentioned drawbacks and provide a flyback transformer that is easy to assemble and attach to a board.

Next, this idea will be explained with reference to the drawings.

Figure 1 shows a partially cutaway side view of the flyback transformer of this invention. In the figure, 1 is a low-voltage bobbin made of synthetic resin, and the low-voltage bobbin 1 is a main body 3 on which a low-voltage coil 2 is wound. A core guide frame 4 is formed at one end, and a terminal attachment part 6 is formed in which a plurality of pin terminals 5 connected to the terminal end of the coil are implanted.

Reference numeral 7 denotes a high-voltage bobbin made of synthetic resin, and a high-voltage coil 8 is wound around the high-voltage bobbin 7, which is installed on the third outer side of the main body of the low-voltage bobbin 1.

A core 9 is composed of a pair of U-shaped cores 9a and 9b, and is disposed inside the main body 2 of the low-voltage bobbin 1 and on the core guide frame 4, and is also disposed on the terminal mounting portion 6 side of the low-voltage bobbin 1. metal fixing plate 10, approximately U-shaped core fixing screws 11, and nuts N2a and 12b attached to the screws 11.
and is fixed to the low pressure bobbin 1.

The flyback transformer is fixed onto a board 14 by inserting pin terminals 5 and board insertion protrusions 13 formed on a fixing plate 10 (described later) into holes provided at predetermined positions on a board 14 such as a printed circuit board. It is.

FIG. 2 is a plan view of the low-voltage bobbin constituting the flyback transformer of this invention, as seen from the terminal mounting portion 6 side, and FIG. 3 is a perspective view.

In FIGS. 2 and 3, the terminal attachment part 6 of the low-pressure bobbin 1
Opposing side walls 1 of the core guide frame 4 integrally formed on the sides
5a.

Two parallel protrusions 16a and 16b are formed approximately at the center inside 15b.

The protrusions 16a and 16b are connected to a fixing plate 10, which will be described later, between the protrusions.
The projecting pieces 19a and 19b of the projecting strips 16 are locked together.
The tips of a and 16b come into contact with the surface of the core 9 disposed inside the core guide frame 4.

Next, FIG. 4 is a perspective view of the fixing plate 10, and FIG. 5 is a side view.

In FIGS. 4 and 5, the fixed plate 10 has bent pieces 18a at both ends of the main body 17.

18b, and a protrusion 16a formed on both side walls 15a, 15b of the core guide frame 4 approximately in the center of the main body 17;
A protruding piece 19a engages between the protruding pieces 19a and 16b to position the low-pressure bobbin 1 and the fixing plate 10.

19b is opposed to the bent piece 18a from the main body 17.

The bent piece 18a is formed by cutting and raising it in the opposite direction to that of the bent piece 18b, and further includes a board insertion protrusion 13 that is inserted into a mounting hole provided in a board 14 such as a printed circuit board.

It is formed by cutting and raising from the main body 17 in the same direction as 18b.

Screw holes 20 and 21 are formed at both ends of the main body 17, into which both ends of the core fixing screw 11 are inserted.

The assembly of this flyback transformer has already been completed by winding the low voltage coil 2 on the outside of the main body 3, and installing the high voltage bobbin 7 with the high voltage coil 8 wound on the outside of the low voltage bobbin 1, the inside of the main body 3, and the core guide frame. The cores 9a and 9b are fitted into the four parts.

Next, the side wall 15a of the core guide frame 4 of the low pressure bobbin 1,
Protrusions 16a, 16 formed inside 15b, respectively.
The protrusions 19a and 19b of the fixing plate 10 are engaged between the protrusions 19a and 19b of the fixing plate 10 to attach the fixing plate 10 to the core guide frame 4 of the low pressure bobbin 1.

Then, fit the core fixing screws 11 to the outer peripheries of the cores 9a and 9b, and insert the screw portions formed at both ends of the core fixing screws 110 into the screw holes 20° and 21 of the fixing plate 10, and then
, 12b.

When the flyback transformer of this invention is to be mounted on a printed circuit board, a pin terminal insertion hole and a hole into which the board insertion protrusion 13 of the fixing plate 10 is inserted are formed in advance on the board on the terminal mounting portion 6 side of the flyback transformer. This is done by inserting the pin terminal 5 and the board insertion protrusion 13 of the fixing plate 10 into each hole.

As mentioned above, the flyback transformer of this invention is
In order for the protrusion formed on the core guide frame of the low-pressure bobbin to come into contact with the core, the core is fixed coaxially with the low-pressure bobbin inside the body of the low-pressure bobbin, and after the flyback transformer is assembled, the core is fixed using special means. There is no need to correct the position of the assembly, and the assembly work efficiency is significantly improved.

In addition, the positioning of the low-voltage bobbin and the fixing plate is done, and the position of the pin terminal fixed to the terminal mounting part of the low-voltage bobbin and the board insertion protrusion of the fixing plate is always fixed. This eliminates the need for a flyback transformer, which significantly improves the workability of inserting it into a printed circuit board, and the effect is particularly great when installing a printed circuit board as a type of flyback transformer.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a flyback transformer according to an embodiment of the present invention, Fig. 2 is a plan view of the low-voltage bobbin as viewed from the terminal mounting section side, Fig. 3 is a perspective view of the same, and Fig. 4 is a partially cutaway side view of a flyback transformer according to an embodiment of the present invention. The figure is a perspective view of the fixing plate in one embodiment of the present invention, No. 5
The figure is the same side view. 1...Low pressure bobbin, 4...Core guide frame, 9...
Core 10...fixing plate, 13...board insertion protrusion, 15
a. 15b...Core guide frame side wall, 16a, 16b...
Projections, 19a, 19b... projecting pieces.

Claims (1)

[Scope of utility model registration request] It is provided on the terminal mounting part side of a low-pressure bobbin that has a terminal mounting part at one end, and is arranged so that it faces the inner side of both side walls of the core guide frame that houses a part of the core, so that its tip always comes into contact with the surface of the core. A fixing plate having two protruding stripes formed thereon, a pair of protruding pieces that engage between the protruding stripes on the negative side, and a board insertion protrusion that protrudes in the opposite direction to the protruding pieces on the other side. is fixed to the core guide frame via the protrusion/protrusion piece, and the core is fixed to the low pressure bobbin.