JPS5976176A - High voltage generator - Google Patents

Abstract

PURPOSE:To improve the efficiency of a high voltage generator by dividing the high voltage winding of a high voltage generating transformer into a plurality of high voltage coils, connecting a multiple magnification voltage rectifier to the first high voltage coil and connecting the other high voltage coil to the charging route of the rectifier. CONSTITUTION:A triple voltage rectifier 10 is connected to between the first high voltage coil L1 of a flyback transformer and the anode of a picture tube. The second high voltage coil L2 is provided, and the second high voltage coil L2 is connected between the connecting midpoint of the first and second diode D1 and D2 of the rectifier 10 and the terminal of the side not grounded of the first condenser C1. The voltage applied with the positive pulse of the first high voltage coil L1 to the voltage charged to the condenser C2 is charged to the picture tube capacity CCRT.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high voltage generator used in a cathode ray tube device such as a television receiver.

For example, in a color television receiver, when rectifying the pulse wave of a flyback transformer to obtain a high voltage output to the anode of a color picture tube, a multiplier voltage rectifier circuit is usually employed in the high voltage generator. FIG. 1 shows a conventional high-voltage generator of this type that employs a standard six-fold voltage rectifier circuit 10, and in the figure, 11 indicates a high-voltage fill (secondary coil) of a flyback transformer. One end of the high-voltage coil 11 is grounded, and a six-fold voltage rectifier circuit 10 is connected between the other end and the anode of a color picture tube (not shown).

This triple voltage rectifier circuit 10 consists of first, second and sixth diodes connected in series; a first capacitor (, and a first and ?l'!2 diode 1) connected between the point and ground.

and a second capacitor C1 connected in parallel to the series circuit of I). Now, in the circuit configuration shown in FIG. 1, if the pulse Ichikawa shown in FIG. 2 is generated in the high-pressure filter 11, the DC high-voltage output EHv supplied to the anode of the color picture tube becomes 2e++et. In addition,
In the figure, capacitor C (IRT is the capacitance of the color picture tube) indicated by a broken line.

Therefore, the voltages applied across each circuit element in FIG. ,, is elb Second capacitor CI is e
, +e 〇In a high voltage generator that employs such a 6-fold voltage rectifier circuit, the DC high voltage ID supplied to the anode of the picture tube
In order to further increase nv, it is necessary to increase the number of turns of the high voltage coil 11 of the flyback transformer, or to use a quadruple voltage, quintuple voltage, etc. rectifier circuit. However, if the number of turns of the high-voltage filter 11 is increased, high-order tuning becomes difficult and ringing becomes worse. Since there are so many of them, there is a drawback that the manufacturing cost becomes high.

The present invention was made in view of the above two points, and aims to provide a highly efficient high-pressure generator that can obtain 1.5 to 2 times the DC high-voltage output of the conventional one with the same number of turns of high-pressure fill. This is consistent with its purpose. Conversely, high L
[:, The present invention provides a highly efficient high-voltage generating device that can obtain a DC high-voltage output comparable to that of the conventional method by reducing the number of turns of the fill.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 3 is a circuit diagram showing an embodiment of the present invention. In the figure, numeral 10 indicates a six-fold voltage rectifier circuit between the first high-voltage coil of the flyback transformer and the anode of the picture tube. It is connected. In this embodiment, the second high pressure
1 coil JH is provided, and this second high voltage coil I11 is 6
First and second dimers 1) of voltage doubler rectifier circuit 1o
1 and the connection midpoint of and the first capacitor (:1
It is connected between the terminal on the non-grounded side of the

In the configuration shown in Figure 3, assuming that the first and second high-voltage coils have the same number of turns, and the output voltage shown in Figure 2 is generated in each fill, first, the output voltage shown in Figure 4 is As shown, at the first positive pulse the first diode I),
is conductive, the second and third dimate), and 1]
, becomes non-conducting 1i7B, so a current i flows as shown, and the first capacitor C1 is charged with a voltage of 2e+. At the next negative pulse, conducts and 1) 1 and Dl
becomes non-conductive, a current I flows as shown in FIG. 5, and the voltage 2e+ charged in the first capacitor itself increases.
2 sets of negative pulses of high voltage coil III and
The voltage of 2(', l+2e,!, which is the sum of

2. Charge. Next, IJs becomes conductive with II-pulse, 1
) I and IJ become non-conductive, so that the current 1. flows, and the voltage 2e charged in the second capacitor C2, + 2e, is applied to the first high voltage coil L.
, the voltage to which the positive pulse eI of , i.e. 3e
l+222 is charged to the picture tube capacitor CORT.

In other words, 3c++2et DC high voltage output 1fluv
will be supplied to the anode of the picture tube. Therefore, it can be seen that in this embodiment, a high voltage output 15 times higher than that obtained by the conventional high voltage generator shown in FIG. 1 can be obtained using the same 6-fold voltage rectifier circuit. On the other hand, the voltage across each circuit element is CI: 26l %C7: 2e+ +2
et , 1)+ is 7e, ,'T,) is 2et, I)s
becomes el.

In this embodiment, as described above, the conventional high voltage coil 11
The first high-voltage coil L has the same number of turns as 1, and the second high-voltage coil L has the same number of turns. By simply preparing and inserting this into a triple voltage rectifier circuit with the same circuit configuration as the conventional one, we not only obtained a DC high voltage output 15 times that of the conventional one, but also ”1 and ri are the first and second
Since it is cut off in terms of alternating current by the dymates I) and (3), the distributed capacitance with respect to the ground becomes small, which also has the advantage of facilitating the superposition of high-order harmonics.

Figures 7, 8, and @10 respectively show the second reference number #4 of the present invention r5, and Figure 7 shows the second high-voltage coil L and the second capacitor C2. When inserted in series, FIG. 8 shows a third high-voltage filter L having the same number of turns, and a second high-voltage coil IJ! is inserted in series with the first capacitor CI as in FIG. 3, and the sixth high-voltage filter Ll is inserted in series with the second capacitor IJC2 as in FIG. ) 1 and 1) 10. (The operation of these embodiments is similar to that of the embodiment shown in Fig. 6, so the explanation thereof will be omitted. WT in Figure 7
In the case of Figure 3, the DC high voltage output is 6e++2et, which is the same as in Figure 3, and in the case of Figure 8, it is 4e+ +3et, which is twice the conventional output.
In the case of Fig. 10, the DC high voltage output of e is 3e++
et's DC disease 1 (-[output is obtained respectively.

DC high voltage output Eov obtained by each of the above embodiments
Table 1 shows the voltage across each circuit element.

From the table above in Table 1, the second embodiment shown in FIG.
It can be seen that the withstand voltage of the capacitors CI and C may be lower than in the first and sixth embodiments shown in the figure. However, as described above, the first embodiment has the advantage that it is easy to superimpose high-order harmonics, so it can be said that it is the most practical of the major embodiments.

As described above, according to the present invention, by using the same number of diodes and capacitors as a normal 6-fold voltage rectifier circuit, a DC high voltage output 1.5 to 2 times that of the conventional circuit can be generated.
Very efficient.

*Ta, jfh Compared to the usual multi-gingler circuit (a circuit in which the high-voltage filter is divided into multiple parts and each connected in series via a diode), it is possible to generate a higher DC voltage with the same number of turns. High voltage carp # tt 2 Target high voltage EH generated in the divided multi-gingler circuit
V is 2e+). Therefore, when generating the same high voltage, the present invention can reduce the number of turns of the high voltage coil, which is advantageous in terms of high harmonic tuning, ringing, etc.

Furthermore, in the case of the second real example shown in FIG.
Since the withstand voltage of capacitors -vC,,C, is almost the same as that of a normal 6-fold voltage rectifier circuit, if the DC disease 1:E output is kept the same as before, the withstand voltage of these capacitors (-1, C1 is It is economical because it is low in price.

As for the structure of each embodiment, it is advantageous to integrate the dimate and the capacitor into the coil, and the coil winding method is preferably a section type (divided winding method) in view of voltage distribution, breakdown voltage, etc.

In the example described above, each high voltage coil had the same number of turns, but
The number of turns can be changed as appropriate, so there may be a difference in valve voltage. Moreover, the magnetic coupling with the one-blow coil (low H coil) of the flyback transformer may be arbitrary. Also, capacitors C,,C.

No matter which side of the high 1-E coil/L7 Il, , L, the connection is placed (i.e., in FIGS. 6 and 8, the TJI is connected between the ground side terminal of A4) Yes, see Figures 7 and 8.

1) Insert it on the connection midpoint side of 1). Also, as shown in Figure 9, take 01 and do not ground the series circuit of 1)! Changes and modifications such as connecting the circuit in parallel with the series circuit of the circuit are optional.

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing an example of a conventional high-voltage light device;
The figure is a waveform diagram of harmonic voltage induced in the high voltage coil of the high voltage generator, Figure 6 is a circuit diagram showing one embodiment of the high voltage generator according to the present invention, and Figure 4 is a circuit diagram showing another embodiment. 9 are circuit diagrams showing a modification of the embodiment shown in FIG. 3. In the figure, 10 is a voltage doubler rectifier circuit, IJI, 2, L3 is a high voltage coil, 7.1) 3 is a rectifier diode (C3 is a capacitor. Patent j; t1 '1 person Electro-acoustic pestle type, company Fig. 11 Fig. 2 Fig. 3 Fig. 2 Fig. 4 2 Fig. 5 Fig. 6 Fig. 7 Fig. 9

Claims (1)

[Claims] The high-voltage winding of the high-voltage generating transformer is divided into a plurality of high-voltage fills, and a multi-voltage rectifier circuit is connected to the first high-voltage coil, and the high-voltage coil of the coil 5 is connected to the charging path of the rectifier circuit. A high pressure generator characterized by being connected to.