JPS6016191B2 - High pressure generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-pressure generator using a flyback transformer for television receivers, and a device that has excellent temperature characteristics and reliability, and can be realized at low cost due to its simple structure. It provides:

First, FIG. 1 shows a conventionally used high pressure generator and will be described.

Here, 1 is a flyback transformer whose primary winding 2 is connected to a horizontal output circuit 3, and the first transformer is divided into two parts to boost the horizontal flyback pulse and generate high voltage.
, second secondary windings 4 and 5. 1st, 2nd 2
The next windings 4 and 5 are the first and second windings connected in series with the same polarity.
diodes 6 and 7, and the first secondary winding 4
Connect the diode 8 for high voltage extraction to the other end and connect the terminal 9.
It outputs high voltage DC for the anode. In addition, a smoothing capacitor 0 is connected to the interconnection point of the second diodes 6 and 7, and a resistor 11 for taking out the focus voltage is connected so that the focus voltage is output to the terminal 12. There is. In the illustrated example, the second secondary winding 5 is grounded via a diode 13, but this diode 13 may be omitted, and a resistor and capacitor for beam current detection may be connected. Sometimes. Now, in such devices, a smoothing capacitor is required to smooth the focus voltage, but since the capacitance between the input and output electrodes of the diode and other stray capacitances are insufficient, conventionally high-voltage ceramic capacitors have been used. 1
0 has been connected and used.

However, such high-voltage ceramic capacitors have the disadvantage of poor temperature characteristics, resulting in insufficient capacitance as the temperature rises.Also, high-voltage pulses are applied, causing failures such as capacitance leakage and short circuits. The drawbacks were that it was easy to use and not very reliable. Furthermore, since such capacitors are special, their cost is high and their installation is troublesome. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an apparatus which overcomes these conventional drawbacks, has excellent temperature characteristics and reliability, has a simple structure, and can be obtained at low cost.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

Note that the same reference numerals as in FIG. 1 are given to the parts of the conventional machine and the explanation thereof will be omitted. In this device, a conductor 14 for forming a smoothing capacitance is provided opposite to the second secondary winding 5, and this conductor 14 is configured to be connected to a resistor 11 for taking out the focus voltage. A feature is that the conductive body 14 is constructed by providing a conductive foil in a mesh shape on an insulating substrate. According to the configuration in which such a conductor 14 is provided,
A capacitance can be formed between this conductor 14 and the second secondary winding 5, and by adjusting the distance and opposing area between the two, a capacitance value required for smoothing the focus voltage can be obtained. Moreover, eddy currents are less likely to be generated in the conductor 14, and eddy current loss is reduced.

According to experiments, it has been confirmed that if the distance between the two is set to about 3 ribs and the opposing area is set to about 20 square meters, a sufficient capacitance value can be obtained, and the focus voltage can be smoothed without adding a separate capacitor element. Ta. As shown in FIG. 3, the flyback transformer 1 used for this purpose includes an insulating bobbin 15 around which a primary winding 2 and first and second secondary windings 4 and 5 are wound, and an iron bobbin 15 wound thereon. Matched ferrite core 16
is housed in an insulating case 17, and the conductor 14 is opposed to the second secondary winding 5 through a partition wall 18 formed integrally with the insulating case 17, and is integrally formed with the insulating case 17. It may be supported and fixed by the protrusions 19, 19', and the space of the insulating case 17 may be filled with an insulating resin 20 such as epoxy resin.

The conductor 14 is formed by providing a steel foil 22 in a mesh shape on an insulating substrate 21, as shown in FIG.

If the mesh is formed in this manner, eddy currents will be reduced, and eddy current loss will be reduced accordingly. The insulating substrate 21 may be a flexible printed circuit board, on which steel foil may be printed. As is clear from the above embodiments, in the present invention, a conductor for forming a smoothing capacitor is provided opposite to the second secondary winding, and this conductor is connected to a resistor for taking out the focus voltage. Therefore, there is no risk of the capacitance changing even when the temperature changes, so it has excellent temperature characteristics, and it is also reliable because it does not suffer from failures such as capacitance leakage or short circuits like conventional high voltage ceramic capacitors. It is possible to obtain a device with high performance.

Furthermore, since the conductor has a mesh shape, eddy currents are less likely to occur, and losses due to eddy currents are reduced. Furthermore, since it is only necessary to provide a conductor in this way, the structure is extremely simple and can be realized at low cost, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional high-pressure generator, FIG. 2 is a circuit diagram of a high-pressure generator according to an embodiment of the present invention, and FIG.
B is a cross-sectional front view and a cross-sectional plan view of essential parts of the device, and FIG. 4 is a perspective view of one component of the device. 1...Flyback transformer, 2...Primary winding, 3...
Horizontal output circuit, 4...first secondary winding, 5...
...Second secondary winding, 6...First diode, 7...Second diode, 8...Diode for high voltage extraction, 9... ...High voltage terminal, 1
1...Resistance for focus crab pressure extraction, 12...
... Focus voltage terminal, 13... Diode, 14... Conductor, 15... Bobbin, 16...
...Ferrite core, 17...Insulation case, 18
・・・・・・Partition wall, 19...Protrusion, 20...
...Insulating resin, 21...Insulating substrate, 22...
...Steel foil. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 A flyback transformer whose primary winding is connected to a horizontal output circuit is provided with first and second secondary windings, and the first and second secondary windings are
The secondary windings of the first and second windings are connected through first and second diodes connected in series with the same polarity, and a high voltage extraction diode is connected to the other end of the first secondary winding, and the first A focus voltage extraction resistor is connected to the interconnection point of the second diode, and is placed opposite to the second secondary winding,
A conductor that forms a smoothing capacitance with this second secondary winding is provided, this conductor is connected to the focus voltage extraction resistor, and the conductor is arranged in a conductive mesh on an insulating substrate. A high-pressure generator characterized in that it is configured by providing a foil.