JPS6015293Y2 - flyback transformer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flyback transformer used in a television receiver.

Generally, in a flyback transformer, 3rd or 5th or higher odd harmonics are tuned between the low-voltage coil and the high-voltage coil, and the pulse voltage generated in the high-voltage coil is rectified and applied to the picture tube. There is.

In particular, in order to perform high-order harmonic tuning, the distributed capacitance of the high voltage coil becomes a problem, and it is necessary to make the distributed capacitance as small as possible.

For this reason, the high-voltage coil is divided into a plurality of blocks, and each block is connected in series via a diode to reduce the distributed capacitance.

Therefore, in the flyback transformer according to the prior art, for example, as shown in Japanese Patent Application Laid-Open No. 49-28817,
A core, a low voltage coil wound around the core, a divided bobbin disposed on the outer circumferential side of the low voltage coil and divided into a plurality of winding grooves in the radial direction by a plurality of flanges, and the divided bobbin. In order to connect a plurality of high-voltage coils that are wound one after the other and each of the high-voltage coils in series, the winding grooves are arranged in empty winding grooves that exist at every other place so that they come into contact with the groove bottoms of the winding grooves. A type of diode is known.

However, in the conventional technology described above, the diode is arranged so as to be in contact with the bottom of the empty winding groove. It will be as close as possible to both sides of the flange forming the flange.

As a result, there is a drawback that the groove bottom of the winding groove or the like induces creeping discharge between both ends of the diode.

In order to improve the above drawback, several protrusions are provided in the groove where the diode is placed, and the lead wires at both ends of the diode are wrapped around each protrusion and locked, so that the diode can be placed between the protrusions. There is also known a structure that is arranged in a groove so as to be suspended in the air to prevent creeping discharge from being induced.

However, with this configuration, the lead wires at both ends of the diode must be manually wrapped around the protrusion to perform the locking operation, which has the disadvantage of poor workability.

Another drawback is that the type of diode is limited to those having lead wires at both ends.

The present invention was developed in view of the above-mentioned shortcomings of the prior art, and it maintains a diode in a point contact state within a space groove formed by a collar and molds the diode with an insulating material to prevent creepage. The object of the present invention is to provide a flyback transformer that prevents the occurrence of discharge, has excellent workability, and can reliably regulate the position of diodes.

In order to achieve the above object distantly, the feature of the structure adopted by the present invention is that the flanged bobbin, which has a plurality of winding grooves defined by a plurality of flanges, has a plurality of flanges that are located between the respective winding grooves and mutually connected to each other. A space groove defined by the facing flanges is formed, and at least a pair of protrusions are protruded into the space groove, and each of the protrusions is provided with a contact portion for holding the diode with at least four points of contact. The diode is held between the contact portions in a point contact state, and the periphery of the diode is molded with an insulating material.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

1 and 2 show a first embodiment of the invention.

In the figure, 1 is a core, and a low voltage coil 3 is wound around one side of the core 1 via a bobbin 2.

4 is a flanged bobbin provided on the outer periphery of the low voltage coil 3 coaxially therewith, and the flanged bobbin 4 has a plurality of flanges 4A, 4B,
4C, . . 4
Between 4H and 41 are equally spaced winding grooves 5, 5.・・・
・It becomes.

Further, among the flanges 4A to 4I, between the flanges 4D and 4E, a space groove 6 is formed which is wider in the axial direction than each of the winding grooves 5.

7 shows a high voltage coil that is divided and wound around each winding groove 5 of the flanged bobbin 4, and the high voltage coil 7 is sandwiched between the space grooves 6,
It is composed of a first high voltage coil block 7A and a second high voltage coil block 7B.

8.9 is located in the space groove 6 and the cylindrical portion 4 of the flanged bobbin 4
A pair of protrusions projecting from J in the radial direction so as to have a diameter smaller than that of each collar 4D, 4E.As shown in FIG. 2, each protrusion 8, 9 has a recess 8A facing each other , 9A are formed, and both ends thereof sandwiching the respective recesses 8A, 9A are contact portions 8.
B, 8B.

9B, 9B.

10 is the first. Second high voltage coil block? A.

7B in series, the diode 10 is located in the groove between the protrusions 8 and 9, and the contact portion 8
They are held in a four-point contact state by B, 8B, 9B, and 9B.

Further, 11 is an insulating material that is molded together with the diode 10 in the space groove 6 while the diode is held between the protrusions 8 and 9. The insides of the recesses 8A and 9A are also molded so that the insulating material 11 is sufficiently spread, and at this time, as shown in FIG. A and 7B are also molded together.

Note that 12 in the figure indicates an output diode.

Since this embodiment is configured as described above, the diode 1
The diode 10 can be held between the contact portions 8B and 9B of the protrusions 8 and 9 in a four-point contact state, and the diode 10 can be held floating relative to the cylindrical portion 4J of the flanged bobbin 4. Moreover, since the insulating material 11 extends around the diode 10, there is no risk of creeping discharge occurring.

Further, during installation, it is only necessary to sandwich the diode 10 between the respective contact portions 8A and 9A, so that workability can be improved and position regulation can be easily performed.

Next, FIG. 3 shows a second embodiment of the present invention, in which the same constituent elements as those of the first embodiment described above are given the same reference numerals and their explanations will be omitted.

However, 21A, 21B, 22A, and 22B are two pairs of protrusions located in the space groove 6 and protruding from the cylindrical portion 4J of the flanged bobbin 4 in the radial direction, and one of the protrusions 21A and 21B is located in the flange. 4
The protrusions 22A and 22B are located on the side D and are spaced apart from each other by a predetermined distance, and the other protrusions 22A and 22B are located on the side of the collar 4E and have a groove width sufficient to sandwich the protrusions 21A and 21B and the diode 10. The protrusions 21A, 21B, 22A, and 22B are arranged so as to face each other, and the width of the protrusions 21A, 21B, 22A, and 22B is small enough to support the diode 10 in point contact.

Although the present embodiment is constructed in this way, the diode 10 can be held between the projecting pieces 21A, 21B, 22A, and 22B by contacting at four points, and is molded with the insulating material 11, as in the first embodiment. Therefore, the occurrence of creeping discharge, etc. can be prevented.

Furthermore, FIGS. 4 and 5 show a third embodiment of the present invention, and the same components as those of the first embodiment described above are given the same reference numerals and their explanations will be omitted.

However, the feature of this embodiment is that a diode 3 is connected between the high voltage coil blocks 7A and 7B of the high voltage coil 7 as shown in FIG.
Two diodes 31 and 32 are arranged in series, and a focus voltage extraction terminal 33 is provided between each of the diodes 31 and 32.

Therefore, in this embodiment, the space groove 6 of the flanged bobbin 4 is
A collar piece 34 that goes around the cylindrical portion 4J of the bobbin 4 is provided.

As shown in FIG. 4, the flange piece 34 includes a half-circumferential portion 34A biased toward the flange 4E side, and a half-circumferential portion 34B biased toward the flange 4D side.
It consists of a connecting portion 34G connecting each of the half circumferential portions 34At34B.

On the other hand, 35 and 36 are space grooves 37 made up of a collar 34D1 and a half circumferential portion 34A for holding the diode 31 in a point contact state.
The protruding pieces 38 and 39 provided inside are also the diode 3.
Half circumference part 34B1 Tsuba 4E to hold 2 in point contact state
A protruding piece provided in the space groove 40 consisting of each text piece 3.
5, 36, 38, and 39 have the same shape as shown in the first embodiment or the second embodiment.

Since this embodiment is configured as described above, each diode 31, 32 can be positioned in each spatial groove 37, 40 and can be held by four-point contact, and the focus voltage located at the connecting part 34C can be A signal can be taken out from the takeout terminal 33.

As described in detail above, the flyback transformer according to the present invention can hold the diode with at least four points of contact by the contact portion of the protrusion provided in the space groove, so it achieves the following effects. .

■ The diode can be held in a point-contact state, and the contact area allows the diode to be placed in a substantially floating state within the space groove with an extremely small area, and since the periphery of the diode is molded, creeping discharge between both ends of the diode is ensured. can be prevented.

■ Since the main body of a diode with a large diameter can be held between the protrusions, the diode can be easily arranged even in a narrow space groove, and the lead wires at both ends of the diode can be attached to the protrusions as in the conventional technology. Locking work by winding can be eliminated.

■ When using an oblong ball diode, the second
It is only necessary to clamp both end portions having a smaller diameter than the maximum diameter portion as shown in Fig. 3 or Fig. 3, and it is possible to reliably prevent movement of the diode in the longitudinal direction, prevent movement in the lateral direction, and regulate the position of the diode. Can be done.

[Brief explanation of the drawing]

1 and 2 relate to the first embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view showing the overall configuration, FIG. 2 is a plan view of the main part in FIG. 1, and FIG. 4 and 5 show a third embodiment of the invention, FIG. 4 is a front view of the main part, and FIG. 5 is a circuit configuration diagram thereof. It is. 1...Core, 3...Low voltage coil, 4.
...Bobbin with flange, 4A~4■...Brim, 5
...Winding groove, 6, 37.40 ... Space groove, 7 ... High voltage coil, 8°9.21A, 21
B, 22A, 22B, 35, 36, 38.39...
・Protruding piece, 8A, 9A・・・Concavity, 8B, 9B・
...Contact part, 10, 31.32...Diode, 11...Insulating material.

Claims (1)

[Scope of utility model registration request] A core, a low-voltage coil wound around the core, and flanges arranged on the outer circumferential side of the low-voltage coil and defined in a plurality of winding grooves by a plurality of flanges that protrude in the radial direction. A flyback transformer comprising a bobbin, a plurality of high voltage coils respectively wound in winding grooves of the bobbin, and a diode provided between the high voltage coils for connecting the high voltage coils in series. A space groove is formed in the flanged bobbin by flanges located between the respective winding grooves and facing each other,
At least a pair of protruding pieces are provided protruding within the space groove, each protruding piece is provided with a contact portion for holding the diode with at least four points of contact, and the diode is held in a point contact state by each of the contact portions. 1. A flyback transformer characterized in that the flyback transformer is configured such that the diode is sandwiched between the diodes and the periphery of the diode is molded with an insulating material.