JPS5926796Y2 - flyback transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flybank transformer used for supplying anode voltage to a cathode ray tube such as a TV receiver.

A conventional flyback transformer had a circuit configuration as shown in FIGS. 1 and 2.

In other words, what is shown in Fig. 1 is a multilayer flat-wound high-voltage coil with a narrow winding width as shown in Fig. 3, or a split-wound high-voltage coil that is wound in sections in the axial direction (not shown) and one diode. The single rectification type shown in FIG. 2 is a voltage doubler rectification type comprised of a high voltage coil and a multiple voltage rectifier circuit similar to the above.

In recent years, in order to simplify the insulation of the high-voltage coil and make it more compact, a circuit configured as shown in FIG. 4 has been proposed.

This is a multi-jingle type which is composed of a divided winding high-voltage coil randomly wound around a divided coil bobbin having a plurality of flanges, and a diode interposed between each of these coils.

However, in each of these methods, the resonant frequency of the series resonant circuit due to the leakage inductance and stray capacitance of the high-voltage coil can be adjusted to the odd-numbered harmonics of the fundamental wave applied to the low-voltage coil, more specifically, the third or fifth harmonic. , 7th, 9th, etc., it is possible to obtain a high-voltage pulse in which odd-numbered harmonics are superimposed on the fundamental wave.
It was a so-called high-order tuning method.

This is because it is difficult to minimize the leakage inductance and stray capacitance of high-voltage coils, which are the cause of harmonic components that adversely affect high-voltage regulation. By setting the value to f, the effect is substantially reduced, and as mentioned above, all conventional flyback transformers are We had no choice but to adopt this higher-order tuning method.

Therefore, the flybank transformer has a low voltage coil that is connected to the TV.
Since it is connected in parallel with the horizontal deflection coil of a cathode ray tube in a television receiver, etc., the inductance of this horizontal deflection coil must be included in the design when achieving high-order tuning of the flybank transformer. Ta.

However, the inductance of this horizontal deflection coil needs to have a value that corresponds to the circuit design of different models of TV receivers, etc., and the flybank transformers also have to be designed individually accordingly.

Therefore, it is difficult to standardize due to lack of versatility.
This has caused a great loss in terms of productivity and cost for the industry in this technical field.

Moreover, even though they are the same model, due to the manufacturing of the horizontal deflection coil,
If there are large variations in inductance that inevitably occur, fine adjustments will be required to achieve more accurate high-order tuning for each valley center of the TV receiver, etc., and as a result, the assembly process of the set will become complicated. It also had drawbacks.

Furthermore, by adopting a higher-order tuning method, high voltage regulation can be improved, but it is still not in a fully satisfactory state. , further improvements in high-pressure regulation were desired.

The present invention was developed to solve these problems all at once, and aims to provide a flyback transformer that is highly versatile and can further improve high voltage regulation.

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

In Fig. 5, 11 is a low voltage coil, and a plurality of tsuba 1
A conducting wire having a wire diameter of 0.4 mrrt is randomly wound in a total of 101 turns in a winding groove divided into nine parts of a split-type coil bobbin 13 having a diameter of 2.

14゜15.16 and 17, 18, and 19 are high-voltage coils, respectively, and high-voltage coil bobbins 20, 21, and 22 have different inner diameters and are made of resin 2 with a wall thickness of 1 mm.23.2
4 and 25, conductive wires having a wire diameter of 0.08 are each wound in a single layer by 540 tan solenoid windings, and the winding width thereof is formed to be approximately equal to the winding width of the low voltage coil 11,
The coils are sequentially stacked and wound on the low voltage coil 11.

26 is a bobbin-shaped insulating member disposed coaxially on the outermost high voltage coil 19; 27 and 28 are a plurality of terminals respectively provided at both ends of this insulating member 26; The low voltage coil 11 and each high voltage coil 14, 15, 16 are connected to the terminals 27, 28.
, 17, 18, and 19 are connected to each other.

Reference numeral 29 denotes terminals 27 provided at both ends of the insulating member 26.
A plurality of diodes are connected between adjacent high voltage coils 14, 15, 16, 17, 18 of the high voltage coils 19 and between the outermost high voltage coils 1.
These valley high-voltage coils are connected in series via valley diodes 29, and equivalently constitute the circuit shown in FIG. 4 above. It is something.

30 is a ferrite core with a diameter of 15 inserted into the coil bobbin 13 of the low voltage coil 11, and is connected to the low voltage coil 11, the high voltage coils 14, 15, 16, 17, 1.
Together with 8 and 19, it constitutes a flyback transformer.

The flybank transformer is completed by coating the entire low-voltage coil and high-voltage coil with resin, or by loading each coil into a resin case and casting with resin.

As a result of measuring the resonant frequency of the series resonant circuit consisting of the leakage inductance of the high-voltage coil and the stray capacitance of the flybank transformer constructed in this way, a value of 550 KHz was obtained.

As a result of measuring the output pulse waveform of this flybank transformer with a synchroscope, it was found that the pulse waveform had approximately the same shape as the input pulse waveform, as shown in Figure 6a, and the high frequency component during the scanning period was also a waveform with a very small amplitude. , so it could be considered to be almost a straight line.

On the other hand, the output pulse waveforms of the single rectification method, voltage doubler rectification method, and multi-ginger single method shown in FIGS. 1, 2, and 4 are as shown in FIG. 6, cyd, respectively. , shows a pulse waveform different from the input waveform,
The high frequency components during the scanning period also have large amplitudes, and these high frequency components with large amplitudes have an adverse effect on high voltage regulation.

Next, as a result of measuring the relationship between the composite inductance L1 when the low voltage coil and the horizontal deflection coil of the cathode ray tube are connected in parallel and the output resistance R8 (including the rectifier circuit) representing the magnitude of high voltage regulation, the seventh The results shown in Figure A were obtained.

In other words, the output resistance 1r of the flyback transformer of the present invention
In the range of 1.20 to 1.50 mH, approximately 1.1. OMΩ
It has flat characteristics in the vicinity.

This shows that even if the inductance value of the horizontal deflection coil changes, there is no need for tuning in the flyback transformer according to this invention.

On the other hand, in the conventional high-order tuning type flyback transformer, for example, Ll is 1.35 m as shown in Figure 7B.
When tuned as H, if Ll changes by 1, the output resistance has a characteristic that draws a curve with a minimum value of 1.35 mH.

This means that if the model of a TV receiver changes and the inductance value of the horizontal deflection coil differs, a flyback transformer with the minimum high voltage regulation must be designed for each model, and even if the inductance is the same, This shows that even with horizontal deflection coils, fine adjustments must be made due to variations that inevitably occur in the manufacturing process of the inductance.

Moreover, the minimum value of the output resistance, which represents the magnitude of high voltage regulation, was usually only about 2.0MΩ in conventional products, but this invention has the revolutionary characteristic of 1.0MΩ. There is.

It should be noted that the above-mentioned embodiment merely shows one embodiment of the present invention, and the present invention is not limited thereto in any way.

In other words, the resonant frequency of the series resonant circuit between the leakage inductance and stray capacitance of the high voltage coil is 550 in this example.
KHz, but this resonant frequency can be changed by changing the winding width of the high-voltage coil, the distance between each coil, the number of divided stages of the high-voltage coil, etc.
At KHz or higher, good characteristics similar to those of the above embodiment were exhibited, but when the frequency was lower than 400 KHz, the high voltage regulation became large, making it necessary to use the conventional high-order tuning method.

Furthermore, although the low-voltage coil in this example is of a split-wound type using a split-type coil bobbin, it may also be a solenoid-wound one using a normal coil bobbin, and the high-voltage coil uses a bobbin, but an insulating film, etc. It is also possible to wrap the coil around the low-voltage coil through another insulating material.

In addition, if the high-voltage coil is wound on an insulating film, the leakage inductance becomes smaller and the resonant frequency becomes higher, making it possible to construct a better flyback transformer and making the winding work easier. automation becomes easy.

Furthermore, although it is desirable that the winding width of the high-voltage coil be as large as possible, it is sufficient that it is at least approximately the same as the winding width of the low-voltage coil, and its shape may also be multi-layer solenoid winding instead of single-layer solenoid winding.

Furthermore, the number of divided stages of the high voltage coil is not limited to six stages as in this embodiment, and the diode interposed between the high voltage coils does not necessarily need to be provided every other high voltage coil, and even if multiple diodes are provided. good.

Furthermore, since the bobbin-shaped insulating member on which the diode is placed is not intended for winding a coil, it is necessary to save material by forming cuts or through holes in areas other than where the terminals are attached. can be done arbitrarily.

Since the flybank transformer of the present invention is constructed as described above, there is no need to use the conventional high-order tuning method.

Therefore, due to its high versatility, standardization is possible, productivity is improved, and it is also advantageous in terms of cost, bringing great benefits to the industry in this technical field.

Furthermore, the high voltage regulation itself has been dramatically improved compared to conventional ones, and the image projected on a cathode ray tube of a TV receiver or the like becomes even more stable.

Furthermore, because the structure includes an insulating member on which the diode is placed on the outermost high-voltage coil, each high-voltage coil can be wound in the same direction so that the current flows in the same direction. Since the alternating current potential difference between the high-voltage coils becomes small, the insulation between the high-voltage coils can be simplified.

In addition, since the diode is placed on the outermost layer of the high-voltage coil, the heat dissipation effect of the diode is excellent, and furthermore, multiple diodes can be attached in advance to the insulating member placed on the outermost layer of the high-voltage coil. To assemble a flybank transformer, all you have to do is stack up the insulating members with the respective coils and diodes installed one after the other, and then connect the lead wires of each coil to the designated terminals of the insulating member with the diodes installed. Because of its high quality, it has various excellent effects such as extremely easy assembly.

[Brief explanation of the drawing]

Figure 1 is an electric circuit diagram of a single-shot rectification type flybank transformer, Figure 2 is an electric circuit diagram of a voltage doubler rectification type flybank transformer, and Figure 3 is a perspective view of a flat-wound high-voltage coil used in a conventional flyback transformer. Figure 4 is an electrical circuit diagram of a multi-ginger one-type flyback transformer, Figure 5
The figure is a cross-sectional front view of essential parts of a flyback transformer according to an embodiment of the present invention, and FIG.
, c and d are conventional ones, and FIG. 7 is a diagram showing the relationship between the parallel combined inductance of the low voltage coil and horizontal deflection coil of the flybank transformer and the output resistance. 11... Low voltage coil, 12... Tsuba, 13... Low voltage coil bobbin, 14, 15, 16, 17, 18, 19.
...High voltage coil, 20.21, 22, 23, 24°25
...High voltage coil bobbin, 26...Insulating member, 27°28...Terminal, 29...Diode, 30...Core.

Claims (1)

[Scope of utility model registration request] A plurality of solenoid-wound high-voltage coils having a winding width approximately equal to at least the winding width of the low-voltage coil are sequentially stacked and wound on the low-voltage coil wound on the core, and these high-voltage coils are ~ By connecting multiple diodes in series, the resonant frequency of the series resonant circuit due to the leakage inductance and stray capacitance of the high voltage coil is set to 400 KHz or more. An insulating member having a plurality of terminals at both ends is arranged on the high voltage coil of the outer layer, and the lead wires of each high voltage coil are connected to each terminal of the insulating member, and the diode is connected to the insulating member. A flybank transformer characterized by being arranged between terminals at both ends of an insulating member.