JPS5910725Y2 - flyback transformer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flight back transformer used for supplying DC high voltage to a cathode ray tube in a TV receiver, etc., and particularly relates to a vertical deflection yoke power supply winding and a secondary B power supply winding. This relates to a flight back transformer in which both are wound around the same core.

In conventional flight back transformers of this type, taps for the required vertical deflection yoke power source and secondary B power source are taken out from appropriate intermediate positions of the high voltage winding.
A certain amount of the vertical deflection frequency in the vertical deflection circuit is superimposed on the secondary B power supply line, causing negative effects such as striped patterns on the cathode ray tube surface. A separate winding from the high voltage winding,
By winding the vertical deflection yoke power supply winding and the secondary B power supply winding at a predetermined interval, static electricity from the vertical deflection yoke power supply winding to the secondary B power supply winding can be reduced. A structure was taken to minimize the induction as much as possible.

However, the conventional means described above are still not sufficient, and it has been desired to develop a flyback transformer that provides electrostatic shielding between both windings.

The present invention has been made in view of these points, and provides a flight back transformer that can sufficiently reduce electrostatic induction from the vertical deflection yoke power supply winding to the secondary B power supply winding. The purpose is to wind both windings so that a part of the low voltage winding is interposed between the two windings, and the low voltage winding shields electrostatic induction between the two windings. It is characterized by the following.

An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, 1 is a low-voltage winding bobbin fitted into a core 2 and has a plurality of winding grooves, and 3 is this low-voltage winding bobbin 1.
A low-voltage winding is divided into each winding groove, and 4 is this low-voltage winding 3.
A vertical deflection yoke power supply winding is wound around the lower part of one end, and 5 is an upper part of the low voltage winding 3 and is wound in a winding groove adjacent to the vertical deflection yoke power supply winding 4. This is the winding for the secondary B power supply.

In other words, the vertical deflection yoke power supply winding 4 and the secondary B power supply winding 5 are arranged on the low voltage winding 3 as a boundary, as shown in FIG. It is wrapped separately on both sides of the upper and lower parts.

6 is a high voltage winding bobbin having a plurality of winding grooves fitted into the low voltage winding bobbin 1, and 7 is a high voltage winding that is divided and wound on each winding of the high voltage winding bobbin.

Secondary B of the flight back transformer configured in this way
When the ripple due to the vertical deflection frequency superimposed on the DC voltage taken out from the power supply winding 5 via the rectifier circuit (not shown) was observed with a synchroscope, the amplitude was approximately 0.2V. It had a

In conventional improvement means, the ripple is 0.5~
Since it had an amplitude of about 0.8 V, it can be seen that the ripple component of the device of the present invention has been greatly improved.

The reason why the ripple caused by the superimposition of the frequency difference of the vertical deflection circuit on the secondary B power supply winding has been greatly improved compared to the conventional one is because of the vertical deflection yoke power supply winding 4. 2
Since the next B power supply winding 5 is wound separately on both sides of the upper and lower parts of the low voltage winding 1, both windings 4,
This is because the electrostatic induction between the coils 5 and 5 is shielded by the low voltage winding 3, one end of which is connected to a reference potential such as ground.

Incidentally, the flight back transformer of the present invention is not limited to that of the above-described embodiment, but can also be constructed as shown in FIG. 2.

In other words, in the one in Figure 2, the low voltage winding 3 is placed in the same winding groove at one end of the low voltage winding bobbin 1, and the vertical deflection yoke power supply winding 4 and the secondary B power supply winding are connected to the upper and lower parts of the same winding groove. The wire 5 is wound separately from the wire 5.

The rest of the structure is the same as that in FIG. 1, so a description thereof will be omitted.

Further, even if the positions of the vertical deflection yoke power supply winding 4 and the secondary B power supply winding 5 in FIGS. 1 and 2 are interchanged, there is no difference in their effects.

As explained above, the flyback transformer of this invention has
Since the vertical deflection yoke power supply winding and the secondary B power supply winding are wound in the upper and lower parts of the low voltage winding, the DC voltage obtained from the secondary B power supply through the rectifier circuit is reduced. It is possible to make the knot due to a certain portion of the vertical deflection frequency extremely small, and the image on the cathode ray tube surface can be made extremely stable.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a main part of a flyback transformer according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of a main part of another embodiment of a flyback transformer of the present invention, and Fig. 3 is a cross-sectional view of a main part of a flyback transformer according to an embodiment of the present invention. It is a figure which schematically showed a part of winding part of a winding and a secondary B power supply winding. 1 - bobbin for low voltage winding, 2 - core, 3 - low voltage winding, 4 - winding for vertical deflection yoke power supply, 5 - winding for secondary B power supply, 6
1. Bobbin for high voltage winding, 7. 1. High voltage winding.

Claims (1)

[Scope of utility model registration request] In a flyback transformer in which at least a low voltage winding, a high voltage winding, a vertical deflection yoke power supply winding, and a secondary B power supply winding are wound on the same core, the vertical deflection yoke power supply winding and two A flyback transformer characterized in that the following B power supply winding is wound on a bobbin for low voltage winding such that one of them is located in the upper layer of the low voltage winding and the other is located in the lower layer of the low voltage winding. .