JPH0140318Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high voltage generator having means for eliminating ringing of high voltage pulses occurring in a high voltage coil of a flyback transformer of a television receiver.

A flyback transformer generates a high-voltage pulse in its high-voltage coil, but this pulse is followed by a residual vibration called ringing at the beginning of the scanning period, and this ringing often has an undesirable effect on the screen of a cathode ray tube. Are known.

For this reason, for example, as described in Japanese Patent Publication No. 46-36371, a parallel circuit of a capacitor and a resistor and a diode placed in series with the parallel circuit are placed between the high-voltage coils of the flyback transformer. Therefore, there is a method for removing the ringing, and FIG. 1 shows a circuit diagram of a high pressure generator equipped with such a ringing cut means.

In FIG. 1, 1 is a flyback transformer consisting of a high-voltage coil 3 and the like for boosting the flyback pulse generated in the primary winding 2 to obtain a high-voltage pulse of a predetermined size; 4 is a rectifier diode D ₁ ;
A multi-voltage rectifier circuit consisting of D ₂ , D ₃ and voltage doubler capacitors C ₁ , C ₂ , 22 is a high voltage for obtaining a medium-high voltage by dividing the rectified smoothed voltage obtained from the middle of the multi-voltage rectifier circuit 4 . It is a variable resistor, and the voltage adjusted by sliders 6 and 7 sliding on the focus resistor Rf and the screen resistor Rs formed on the substrate of the high voltage variable resistor 22 is applied to the cathode ray tube. The focus voltage and screen voltage are taken out.

By connecting a parallel circuit of a resistor R and a capacitor C between both ends of the high-voltage coil 3, and a diode D arranged in series with the parallel circuit, the ringing component of the high-voltage pulse generated in the high-voltage coil 3 is suppressed. It constitutes a ringing cut means for removing.

By the way, in such a conventional high voltage generator, the diode D for ringing cut and the multiplier rectifier circuit 4 are built into the same terminal board, and housed together with the flyback transformer 1 in one insulating case. Although molded with resin, the parallel circuit of the resistor R and the capacitor C, which is the ringing cut means, is externally mounted on a printed circuit board outside the insulating case.

However, a voltage of approximately 2000V is applied to both ends of the parallel circuit due to the negative ringing component of the high voltage pulse, and when this parallel circuit is mounted on a printed circuit board as described above, the capacitor C
Creeping discharge occurs between both ends of the parallel circuit due to moisture between the ends of the lead wire, the printed circuit board itself absorbing moisture, or dust, etc.
The discharge path portion of the printed circuit board becomes carbonized and eventually becomes short-circuited. For this reason, there was a risk that an excessive current would flow through the ringing cut diode D, causing damage to the diode D or breakdown of the capacitor C withstand voltage.

The present invention has been devised in view of the above drawbacks.

The high-pressure generator of the present invention will be explained below with reference to Figures 2 to 7, but the same parts as those shown in the circuit diagram of Figure 1 will be given the same figure numbers and their explanation will be omitted. .

FIG. 2 is a perspective view of the high-voltage coil bobbin used in the present invention. A high-voltage coil 3 is wound in sections between each of the flanges 9 of the high-voltage coil bobbin 8, and the winding of the high-voltage coil 3 begins The end of the high voltage coil bobbin 8 is wound around the terminal fitting 12 inserted into the first terminal holding portion 11 formed on the low voltage side collar 9a, while the winding end of the high voltage coil 3 is connected to the high voltage side of the high voltage coil bobbin 8. It is adapted to be wound around a terminal pin 13 implanted in the side collar 9b. Further, the collar 9a of the high voltage coil bobbin has the collar 9a.
A second terminal holding part 14 is formed which extends in the tangential direction of a and is arranged in parallel with the first terminal holding part 11 and has a tip end hanging down. A terminal fitting 15 as shown in FIG. 3 is inserted.

The terminal fitting 15 is formed by folding back an elastic metal plate to form a folded part 15a, and by vertically bending the folded plate to form a folded part 15b. FIG. 4 shows a plan view of the second terminal holding portion 14, and the terminal fitting 15 is attached by press-fitting the folded portion 15a of the terminal fitting 15 into the recess 14a of the holding portion 14. Then, a lead wire at one end of a parallel circuit of a capacitor C and a resistor R constituting a ringing cut means is soldered to the terminal fitting 12 inserted into the first terminal holding portion 11 together with the winding start portion of the high voltage coil 3. On the other hand, the lead wire on the other end side of the parallel circuit is connected to the bent part 15 of the terminal fitting 15 of the second terminal holding part 14.
It is connected by soldering at b. Thereafter, the low voltage coil bobbin 16 and the high voltage coil bobbin 8 are combined as shown in FIG. Metal fittings 15
Since the lower portions 15c of the terminal pins 18 and the terminal fittings 15 are disposed close to each other, the terminal pins 18 and the terminal metal fittings 15 can be easily connected by soldering.

Then, as shown in FIG. 6, the terminal board 19 incorporating the multi-voltage rectifier circuit 4 is attached to the high-voltage coil bobbin 8 and housed in the insulating case 20, and the case 20 is filled with an insulating resin 21 such as epoxy resin and molded. . A high-voltage variable resistor 22 for extracting the focus voltage and screen voltage is attached to the insulating case 20, and a lead wire _l1 for supplying voltage to the high-voltage variable resistor 22 is inserted through the insulating case 20. A notch 23 is provided as shown in FIG. 7, and the capacitor C is arranged so as to fit into the notch 23 along the wall surface 20a of the insulating case 20.

In this way, in the high voltage generator of the present invention, the parallel circuit of the resistor R and capacitor C constituting the ringing cut means can be connected and fixed to the high voltage coil bobbin 8, so that the resistor R and capacitor C can be connected to other parts such as the coil. Since the resistor R and the capacitor C are molded together with the insulating resin 21, not only is the insulation between the resistor R and the capacitor C extremely good, but also their fixation is solid, improving reliability.

Further, in the embodiment of the present invention, both the resistor R and the capacitor C constituting the ringing cut means are connected to the first
Although the terminal fitting 12 of the terminal holding part 11 and the terminal fitting 15 of the second terminal holding part 14 are connected, only the capacitor C is connected and fixed to both the terminal fittings 12 and 15, and the resistor R is connected to the insulating case 20. It may be provided by printing and firing in the same manner as other printed resistors on a substrate housed in the attached high-voltage variable resistor 22.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of the high voltage generator, Figure 2 is a perspective view of the high voltage coil bobbin used in the high voltage generator of the present invention, and Figure 3 is the main parts of the second terminal holding part and the terminal fitting inserted therein. 4 is an enlarged view, FIG. 4 is a plan view of the second terminal holding part, FIG. 5 is a perspective view showing a state in which a ringing cut capacitor and a resistor are attached to the high voltage coil bobbin used in the high voltage generator of the present invention, and FIG. The figure is a cross-sectional view of the main part showing the state in which it is housed in an insulating case, and FIG. 7 is a bottom view thereof. 3...High voltage coil, 4 ...Multiple voltage rectifier circuit, 8
...High voltage coil bobbin, 9a...Brim, 11...First terminal holding part, 12...Terminal fitting, 14...Second
Terminal holding part, 15... Terminal fitting, 16... Low voltage coil bobbin, 18... Terminal pin, R... Resistor, C
...Capacitor, D...Diode.

Claims (1)

[Claims for Utility Model Registration] A ringing cut means consisting of a parallel circuit of a resistor R and a capacitor C, and at least one diode D arranged in series with the parallel circuit is provided at both ends of the high voltage coil 3 of the flyback transformer 1. The high voltage generator is configured such that a multi-voltage rectifier circuit 4 for supplying high voltage to an anode electrode of a cathode ray tube is connected to one end of the high voltage coil 3, and the high voltage coil 3 is wound around the high voltage coil 3. a first terminal holding part 11 provided on the low voltage side collar 9a of the high voltage coil bobbin 8; a first terminal fitting 12 attached to the first terminal holding part 11 and to which the winding start end of the high voltage coil 3 is connected; , provided on the high voltage coil bobbin 8, and provided on the first
A second terminal holding part 14 which is arranged in parallel with the terminal holding part 11 and whose tip part is made to hang down; and a second terminal fitting 15 which is attached to the tip part.
and a terminal pin 18 that is attached to the low-voltage coil bobbin 16 that is combined with the high-voltage coil bobbin 8 and is provided to be placed close to the lower part 15c of the second terminal fitting when combined; solder connecting the two terminal fittings 15; lead wires at both ends of the capacitor C connected to the first terminal fitting 12 and the second terminal fitting 15, respectively; and a part of the terminal pin 18. are exposed to the outside, and the high voltage coil bobbin 8, the first terminal holding part 11, the first terminal fitting 12, and the second terminal holding part 1 are exposed to the outside.
4, second terminal fitting 15, low voltage coil bobbin 1
6. A high voltage generator comprising: solder, a capacitor C, and an insulating resin 21 for molding a lead wire.