JPS6020885B2 - flyback transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flyback transformer used in television receivers and the like.

FIG. 1 shows an exploded perspective view of a conventionally used flyback transformer. To explain the prior art with reference to the figure, the primary coil 2 wrapped in a winding frame 1, the secondary coils 4a and 4b wrapped in a winding frame 3, and the end of the winding of the secondary coil 4a and the end of the winding of the secondary coil 4b. A rectifier 5a is connected between the beginnings of winding, and
Connect one end of the rectifier 5b to the end of the next coil 4b.
The other end of b is connected to a high-voltage electric wire (not shown) for conducting high voltage to the cathode ray tube anode, and the primary coil and the first
Iron the secondary coil so that it is located outside the secondary coil,
A closed magnetic path with a gap through which the primary coil and secondary coil are inserted is formed by a pair of magnetic cores 6 and a gap material 7 for preventing saturation of the magnetic cores. Thereafter, the pair of magnetic cores 6 are fixed using a U-shaped fastener 8 and a metal fitting 9 and a screw 10. moreover,
Insulating material was used to insulate the areas where high voltage was applied. The flyback transformer according to the conventional technology configured as described above has {1' primary coil and secondary coil
The degree of electromagnetic coupling between the coils was small because they were joined in a circle.

'2} If it takes time to integrate the coil part, the pair of magnetic cores, the gap material, etc., and if the clamping force of the magnetic core is not constant during this process, the inductance of the coil will vary, making it difficult to achieve uniform quality. Since flyback transformers are difficult to manufacture, a lot of time is spent on keeping the tightening force constant. {3' Since the pair of magnetic cores are mechanically fixed, there is some play, and the magnetic field vibrates during operation, causing the core to vibrate, producing oscillating noise and making it unpleasant to the ears. [4
1. Eddy currents were generated in parts surrounding the magnetic core, such as tightening odor, and turned into heat, causing thermal deterioration of the flyback transformer and reducing the reliability of the flyback transformer. It also reduced the efficiency of the flyback transformer. SUMMARY OF THE INVENTION An object of the present invention is to provide a flyback transformer with high reliability and high performance by eliminating or reducing the drawbacks of the prior art described above.

In order to solve the above-mentioned drawbacks of the prior art, the present invention forms a continuous wire winding groove made of an insulating material on the entire circumference or a part of the magnetic core with a gap to prevent the saturation of the magnetic core. The present invention is characterized in that a primary coil and a secondary coil are wound around the magnetic core having the winding groove.

To explain the present invention based on the drawings, in FIGS. 2, 3, 4, and 5, the primary coil 2 is wound in a spiral shape around a core 6' having a gap 7'. Primary coil 2
The secondary coils 4a and 4b are recaptured in a spiral shape without intersecting with the secondary coils 4a and 4b.

The secondary coils 4a and 4b are connected by a rectifier 5a, and the rectifier 5b is connected between the end of the secondary coil 4b and a cathode ray tube anode (not shown) which is a high voltage supply source. As explained above, the winding grooves 15-a-a'-b-b'- c-c′1
6aa'bb'cc' 1 7aa'bb'c (actually provided continuously over the entire circumference of the magnetic path of the magnetic core 6')
In the case of the primary coil, the winding is carried out half a turn around the magnetic core 6' from the lower layer of the winding groove 15a, and the magnetic core is wound from the lower layer of the winding groove 15a' to the winding bag groove 15b in the same manner. The primary coil is wound in such a manner that the magnetic path No. 6 is wound all around or partially up to the upper layer of the winding groove 15a, and if the number of turns is insufficient, the primary coil is wound again from the upper layer of the winding groove 15a in the same manner as above. to wear Thereafter, the secondary coil is also wound in the same manner. Therefore, in the drawing in which the primary coil and the secondary coil are wound alternately, they are wound two to three times in each winding groove, but it goes without saying that any winding is possible. Further, it can be freely selected depending on the inside of the winding groove, the flange thickness, the winding diameter, the number of turns, and the magnitude of the potential between the windings. As described above, the constructed flyback transformer has a single core, which reduces the work time for assembling the magnetic cores, and makes it possible to manufacture a flyback transformer with uniform performance with less variation in coil inductance. It is possible to do so, and the oscillation noise caused by the vibration of the heart will almost never be generated.

Furthermore, since there are no objects around the magnetic core that generate eddy currents, a highly reliable and efficient flyback transformer can be achieved. As in the present invention, if the primary coil and the secondary coil are wound in a toroidal manner alternately and in a spiral manner,
The shape of the secondary coil is better than that of electromagnetic coupling between the secondary coils, enabling high-order harmonic tuning of the flyback transformer, and improving the high voltage fluctuation rate. Further, the electromagnetic coupling is good even if the primary coil and the secondary coil are alternately wrapped around a part of the magnetic path instead of around the entire circumference of the magnetic core. In this case, the winding method may be normal spiral winding instead of toroidal winding, and the winding efficiency is 3
Better than the picture. Examples of main parts of a coil formed by ordinary spiral winding are shown in FIGS. 6 and 7. FIG. 6 shows a case where the secondary coils 4a and 4b are divided into two, and these 4a and 4b are arranged and connected to the left and right sides of the rectifier 5a to form a coil section. FIG. 7 shows the secondary coil connected to a rectifier 5a,
When 5b is divided into three parts, 4a, 4b, and 4c, FIG. 8 is a zero connection diagram. In this case 4a, 4b, 4c and 1
The secondary coils 2 are arranged in parallel close to each other, and if the withstand voltage between the windings is considered, the bobbin length can be made shorter than the example shown in Figure 6. A flyback transformer with improved coil electromagnetic coupling can be obtained. The above-mentioned flyback transformer according to the present invention can solve the above-mentioned prior art. In other words, since the primary coil and the secondary coil are wound alternately, magnetic coupling is good, and if a means is used to integrate the magnetic cores when forming the winding grooves, the conventional technology using a pair of magnetic zeros can be improved. The number of parts can also be reduced.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a flyback transformer according to the prior art, Fig. 2 is an electrical wiring diagram of the flyback transformer of the conventional and the present invention, Fig. 3 is a simplified wiring diagram of the flyback transformer of the present invention, and Fig. 4 5 is a partially enlarged view of the winding groove formed around the magnet 'D, FIG. 5 is a partial sectional view of the flyback transformer in which the winding is loosely wound, and FIGS. FIG. 8 is an electrical wiring diagram in FIG. 7. 2...Primary coil, 4a, 4b, 4c...Secondary coil, 5a
, 5b, 5c... Rectifier, 6, 6', 6''... Core, 7, 7'... Gap material and gap. d 4 years old 7 ward O 8 figure

Claims (1)

[Claims] 1. In a flyback transformer in which a primary coil and a secondary coil are wound around an annular magnetic core, a plurality of winding material winding grooves are formed in a continuous linear manner in line with an insulating material around the entire circumference of the magnetic core. The primary coil is linearly wound in one of the winding grooves, and the secondary coil is linearly wound in a plurality of winding grooves provided in line with the primary coil winding groove. A flyback transformer characterized by being rotated.