JPS6337485B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flyback transformer used in a television receiver.

In general, flyback transformers have different performance due to differences in the B voltage of the horizontal deflection circuit that uses them, and differences in circuit constants such as the inductance of the horizontal deflection coil and the resonant capacitor. need to be designed.

Performance requirements for flyback transformers include low regulation and low ringing, and as a means to satisfy these requirements, the leakage inductance and distributed capacitance of the flyback transformer have traditionally been adjusted to appropriate values. Performing harmonic tuning. Leakage inductance in particular is adjusted by increasing or decreasing the number of turns of the low-voltage coil and high-voltage coil, or by increasing or decreasing the relative distance between the low-voltage coil and the high-voltage coil, but in conventional flyback transformers, the low-voltage coil is wound Since the position is uniformly determined and cannot be selected arbitrarily, it is difficult to design a flyback transformer that can be adapted to a wide variety of horizontal deflection circuits with a narrow variable range of leakage inductance and different circuit constants.

The present invention has been devised to eliminate the above-mentioned drawbacks, and will be described below with reference to the drawings.

FIG. 1 shows a cylindrical first low-voltage coil bobbin 1 that is provided integrally with a terminal board 4 in which a plurality of external connection terminal pins 3 are implanted, and a core (not shown) is inserted into a hollow portion 1a. FIG. 2 is a plan view of this as seen from the terminal board 4 side, and when it is necessary to make the leakage inductance very small, this first low voltage coil bobbin 1
A low-voltage coil is uniformly wound around the cylindrical portion 1b, and a high-voltage coil is arranged around the outer periphery of the low-voltage coil. FIG. 3 is a front view of the second low-voltage coil bobbin 2 having a plurality of flanges 5, 6, 7, and FIG. 4 is a plan view thereof.
9 and 10 are provided. This second low voltage coil bobbin 2 is connected to the first low voltage coil bobbin 1 as shown in FIG.
When a high leakage inductance is required for the low voltage coil 12, the low voltage coil 12 is wound around the groove 11 formed by the collar 5 and the collar 6, as shown in FIG. A plurality of protrusions 13 (see FIG. 4) are provided on the inner surface of the second low-voltage coil bobbin 2 to prevent wobbling in the first low-voltage coil bobbin 1.
Then, a high-voltage coil bobbin 17 having a storage portion 14 in which the second low-voltage coil bobbin 2 can be placed and in which a high-voltage coil 15 is wound in sections by a plurality of flanges 16 is arranged as shown in FIG. In the drawings showing this embodiment, the concave groove 11 of the second low voltage coil bobbin 2 is arranged so that the leakage inductance is maximized.
A low voltage coil is wound on the second low voltage coil bobbin 2, but if it is desired to reduce the leakage inductance, the second low voltage coil bobbin 2 is also wound separately in the other concave groove 18, and if further reduction in leakage inductance is required, Second
The low-voltage coil may be wound separately in both grooves 11 and 18 of the low-voltage coil bobbin 2, and also on the first coil bobbin 1. In addition, the second low voltage coil bobbin 2
Notches 8 and 10 provided in the collars 5 and 7, respectively.
is for drawing out the coil wire to the outside of the bobbin 2, and the notch 9 of the collar 6 is used when dividing the coil wire into the double grooves 11 and 18 for winding.

Furthermore, as described above, the leakage inductance can be minimized by forming the low voltage coil only on the first coil bobbin without inserting the second low voltage coil bobbin into the first coil bobbin. Furthermore, the first
It goes without saying that the low voltage coil wound around the cylindrical portion of the low voltage coil bobbin and/or the second low voltage coil bobbin is coaxially arranged with the high voltage coil.

Therefore, several winding positions of the low-voltage coil can be selected, and the variable range of leakage inductance is greatly expanded, and in particular, it is possible to obtain a state in which the leakage inductance is as small as possible.

As explained above, according to the present invention, a first low-voltage coil bobbin has a cylindrical part into which a core is inserted into a hollow part, a high-voltage coil bobbin is wound with a high-voltage coil arranged coaxially with the cylindrical part, a second low-voltage coil bobbin having a groove formed by a plurality of flanges, the second low-voltage coil bobbin being able to be inserted into and removed from the cylindrical portion of the first low-voltage coil bobbin and disposed in the housing portion of the high-voltage coil bobbin; Since the low voltage coil is wound around the shaped portion and/or the second low voltage coil bobbin so as to be coaxially arranged with the high voltage coil, it is possible to greatly vary the range of increase/decrease in leakage inductance, and in particular, the leakage inductance can be increased. Therefore, it is possible to obtain a flyback transformer that can be suitably applied to many types of horizontal deflection circuits having different circuit constants.

[Brief explanation of drawings]

All drawings relate to the present invention,
FIG. 1 is a side view schematically showing a first low-voltage coil bobbin, and FIG. 2 is a plan view thereof. FIG. 3 is a side view of the second low-voltage coil bobbin, and FIG. 4 is a plan view thereof. Fig. 5 is a perspective view showing the combined state of the first and second low-voltage coil bobbins, Fig. 6 is a cross-sectional view of main parts showing the state in which the low-voltage coil is wound thereon, and Fig. 7 is the positional relationship between the high-voltage coil and the low-voltage coil. FIG. 1... First low pressure coil bobbin, 1a... Hollow part, 2... Second low pressure coil bobbin, 5, 6, 7...
...Tsuba, 11, 18...concave groove.

Claims (1)

[Claims] 1. A first low-voltage coil bobbin having a cylindrical part into which a core is inserted into a hollow part, a high-voltage coil bobbin wound with a high-voltage coil arranged coaxially with the cylindrical part, and a concave groove formed by a plurality of flanges. and a second low voltage coil bobbin that is freely insertable and removable in the cylindrical part of the first low voltage coil bobbin and arranged in the storage part of the high voltage coil bobbin, the cylindrical part of the first low voltage coil bobbin and/or the second low voltage coil bobbin. A flyback transformer characterized in that a low voltage coil is wound around a coil bobbin so as to be coaxially arranged with the high voltage coil.