JPS59161803A - Fly-back transformer - Google Patents

Abstract

PURPOSE:To avoid the generation of ringing, to obtain an excellent image quality and improve the safety by introducing high resistance wire material for a part or the whole of a high voltage coil which composes a fly-back transformer. CONSTITUTION:A low voltage coil 12 is wound on the circumference of a core 11 and a high voltage coil 13 is wound on the circumference of the coil 12. The high voltage coil 13 is divided into winding sections 13a-13d and the sections 13a-13d are successively laminated concentrically to the core 11 and insulation layers S are inserted between each sections. Rectifying diodes 14a-14d are connected between the sections 13a-13d and to the output side of the section 13d in series. A high voltage output can be obtained from an output terminal 15 of the diode 14d. In the coil 13, a section, for instance, the section 13a, is composed of high resistance wire material, for instance, constantan wire, in order to have a DC resistance of 3-40kOMEGA. With this constitution, ringing generated in the section 13a is attenuated by the section itself and eliminated so that an excellent image quality can be obtained and the safety is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flyback transformer for supplying high voltage to a cathode ray tube anode of a television receiver.

Generally, in a flyback transformer, a predetermined high voltage is obtained by boosting the pulse voltage generated by the switching operation and the C resonant circuit using a high-voltage coil, and rectifying it using a rectifier diode. It is known that the voltage is generated during the retrace period, but is superimposed on the distributed capacitance and Couge inductance.

This ringing energy then spreads to each part of the television circuit through capacitive coupling or electromagnetic coupling, resulting in vertical stripes of brightness and darkness appearing on the screen of the cathode ray tube, degrading the image quality, and causing damage to the high-voltage coil. This causes disadvantages such as a rise in temperature due to the flow of the necessary current, and the emergence of a flyback transformer that eliminates these disadvantages, that is, has a configuration that does not cause ringing, has made it possible to obtain good image quality characteristics. , and was strongly desired from the standpoint of safety.

In a conventional flyback transformer, for example, the first
As shown in the figure, the high-voltage coil 1 is divided into the first several (four in the drawing) winding sections 1a, ib, ic, and 1d, and each winding section 12 to 1d is connected in series to the output side of the winding section 1d. rectifier diodes 2a, 2b.

2C92d is connected, and the winding sections 1a to 1d of the high voltage coil 1 are superimposed on the low voltage coil 4 wound around the core 3, and each is laminated and wound concentrically around the core 6. In the case of , since the coupling between each layer (winding sections 13 to 1d) of the high voltage coil 1 is extremely good and there is no AU potential between each layer, each winding section 1
A loop for causing ringing is not formed between 8 and 1d, and ringing occurs at the momme of the first layer (winding section 1a) of the high voltage coil 1.
By connecting resistor 5 in series to the ground side of a,
The ringing was removed by consuming the energy of the ringing. On the other hand, as shown in Figure 2,
The flat pressure coil 1 is divided into several winding sections 1a, 1b, 1c.
, 1d, rectifier diodes 2a, 2b, 2 are connected in series between each winding section 13 to 1d and on the output side of the winding section 1d.
C, 2d are connected, and the high-voltage coil 1 is wound in a plurality of windings. In the case of a flyback transformer configured by rotating, each winding section 1a to 1d divided by a diode is connected to the low voltage coil 4 independently, and each winding IX: 1a to 1d is divided by a diode.
d creates a ringing loop, and each winding section 13
Ringing was removed by providing means (not shown) for removing ringing every 1 d. As described above, in conventional flyback transformers, different ringing removal means must be provided depending on the winding shape of the high-voltage coil, which lacks applicability and requires separate parts such as resistors. , the number of parts will increase, the structure will be complicated, and there is a risk of cost increase.In addition, if a resistor is used to remove ringing, the energy of the ringing will be concentrated on the resistor and the resistor will generate heat. The present invention is aimed at eliminating the above-mentioned drawbacks, such as requiring a resistor with a large shape or setting a large space for the resistor, resulting in an increase in the overall size. The present invention relates to a flyback transformer, and particularly relates to a flyback transformer having a configuration in which ringing does not always occur regardless of the winding shape of a high voltage coil.

Hereinafter, one embodiment of the flyback transformer of the present invention will be described in detail with reference to the drawings. In FIG. 3, a low-voltage coil 12 is wound around the outer periphery of the core 11, and a high-voltage coil 15 is wound around the outer periphery of the low-voltage coil 12 into four winding sections 13a, 13.
b, 15c, 13d, each winding section 16a
.about.13d are sequentially wound around the core 11 via the insulating layer S in a concentrically laminated state. Rectifier diodes 14a, 14b, 14c, and 14d are connected in row w between each winding section 13a to 13d of the high voltage coil 13 and on the output side of the outermost winding section 13d, and from the output end 15 of the rectifier diode 14d. This is to obtain high voltage output. Here, the @ line section 138 that constitutes the high pressure filter 13
13d, the innermost periphery, that is, the winding section 15a wound adjacent to the low-voltage coil 12, has a resistance value of 2μΩc so that the DC resistance of the coil is 6Ω to 40Ω.
The wire is made of a high-resistance wire having a specific resistance of m to 1000 μQcm, such as constantan #, manganin S, m alloy wire, aluminum alloy wire, Niracle wire, iron alloy wire, etc.

In the flyback transformer of configuration 1, the innermost winding section 13a of the high-voltage coil 16 is constructed using a high-resistance wire material (specific resistance 2 μOcm to 1000 μOcm), so that the winding IX portion 13a itself is The ringing generated by the winding section 13a is attenuated as its energy is consumed by the resistance component of the winding section 13a itself (resistance value of 3Ω to 40Ω).
The ringing is finally removed. On this occasion,
If the resistance component (resistance value) of the winding section 13a is less than 6Ω, it has little effect on ringing, while if it is more than 40Ω, it is effective against ringing, but the power loss increases, and both are not practical. This is problematic.

In one embodiment of the flyback transformer of the present invention, the high-voltage coil is divided into a plurality of winding sections, and each winding section is wound in a concentrically laminated state around the core, and the innermost layer ( We have described the method of eliminating ringing by using high-resistance wire only in the winding section of the low-voltage coil (ll!l), but for example, in a configuration where the focus output is taken out from the middle of the high-voltage coil, it is possible to connect the lead for a long time, When connecting capacitors, ringing loops are created in winding sections other than the innermost layer winding section, and of course high resistance wire is used for these winding sections, and multiple wires are connected. In a flyback transformer in which each glued section of a high-voltage coil divided into 2 parts is wound using a split bobbin in parallel to the core in the axial direction, all windings of the high-voltage coil forming a ringing loop are used. High resistance wires are used for the sections, and the parts where high resistance wires are used can be changed as appropriate depending on the occurrence of ringing loops.
The winding shape of the curved ball coil, the number of divisions of the high-voltage coil, the number of rectifier diodes, etc. are not limited to the number of examples.

As described above, in the flyback transformer of the present invention, high-resistance wire is used for part or all of the high-voltage coil constituting the flyback transformer.

High voltage coil winding shape 1 without changing the configuration
Regardless of the winding configuration, ringing that occurs in all flyback transformers can be removed, making it extremely versatile.

Furthermore, since separate parts such as resistors are not required, the number of parts can be reduced, the structure can be simplified, and costs can be reduced. Furthermore, since the energy consumption of ringing is dispersed over the entire portion of the high-voltage coil using high-resistance wire, there is no concern that abnormal heat generation will occur on the circuit. As described above, according to the flyback transformer of the present invention, ringing can be removed with a simple configuration, good image quality characteristics can always be obtained, and the flyback transformer is also highly safe. Performance C) (If applied to a flyback transformer for T displays, the effect will be great.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of a flyback transformer equipped with a conventional ringing removal means, FIG. 2 is a cross-sectional view showing an example of a flyback transformer in which the ringing removal means is omitted, and FIG. 6 is a cross-sectional view showing an example of a flyback transformer equipped with a conventional ringing removal means. FIG. 2 is a cut-away i5u diagram of a flyback transformer in one embodiment of the present invention. 13 High UE coil, 13a to 13d, high voltage coil winding section, (16a... winding section using high resistance binding material, patent applicant Denki Onso Co., Ltd. Fig. 7 Fig. 2 Fig. 3 Fig. 14-

Claims (1)

[Claims] A flyback transformer characterized in that a high-resistance wire is used for part or all of the high-voltage coil that constitutes the flyback transformer.