JPS6276972A - Horizontal deflection circuit - Google Patents

Abstract

PURPOSE:To sufficiently correct intermediate pin distortion while securing the dynamic range of right-and-left pin distortion correction by using a transformer structure to a modulation coil and supplying a deflection current to a correction coil which is a secondary coil. CONSTITUTION:The secondary winding 20b of the transformer 20 is connected to the first S-shaped correction capacitor 11 in series. The other end of said winding is connected to a connection point between the second S-shaped correction capacitor 13 and the primary winding 20a of the transformer 20. When a deflection current (iy) is large, a modulation current i' can be made in small value even if the S-shaped voltage of the capacitor 13 by said current (iy) goes to a large value. Therefore, even when the capacity of the capacitor 13 is made smaller for the intermediate pin distortion correction, the dynamic range of the right-and-left pin distortion correction can be made wide. As a result, a sufficiently practical right-and-left pin correction distortion correction circuit can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Description of the Invention [Field of Industrial Application] The present invention relates to a horizontal deflection circuit for a television receiver, and particularly to one that can effectively correct left and right pin distortion.

[Summary of the invention]

Is this invention a left and right pin distortion? 1IiIF is provided with a modulating coil in series with the horizontal deflection coil, and by applying a vertical period compensation voltage to this modulating coil, the pin distortion is compensated for. The Neo horizontal deflection circuit is designed to effectively compensate for the left and right pin distortion that remains in the horizontal middle of the screen, especially as cathode ray tubes become larger and screens become flatter. It is.

[Conventional technology]

Conventionally, ri was used as the left 11-bin running arm stop circuit of the horizontal deflection circuit.
It is well known that a J saturation reactor is connected in series to a horizontal deflection coil, and a vertically periodic parabolic wave is supplied to the reactor. However, since this pin distortion correction method involves changing the inductance value of the deflection circuit, it has the drawback that vertical period fluctuations occur in the high voltage in response to changes in the vertical period inductance value.

In contrast, a left and right bin distortion correction circuit has been proposed in which there is no change in crystallization due to such modulation of pin distortion correction (see Japanese Patent Publication No. 57-39102).

Figure 3 shows an example of this type of left and right pin distortion correction circuit.
1) is a horizontal output transistor.

A drive signal with a horizontal period from the horizontal drive circuit is supplied to the base of the horizontal output transistor (1), and a voltage from the DC power supply (2) is supplied to the collector of the primary winding of the flyback transformer (3). Supplied via. The emitter is then grounded.

A surface pressure rectifier circuit (4) is connected to the secondary winding side of the flyback transformer (3), and a high voltage output voltage E is connected to the terminal (5).
HV is taken out.

The damper diode (6) and the common 1-volt capacitor (7) are connected in parallel to form a first parallel circuit, and the damper diode (8) and the common 1-volt capacitor (9) are connected in parallel. to configure a second parallel circuit, and these first and second parallel circuits are connected in series,
The series circuit is connected in parallel between the collector and emitter of transistor (1).

(10) is the horizontal deflection coil, (11) is the first 8
The horizontal deflection coil (10), capacitor (11), and modulation coil (12) are connected in series, and the series circuit is connected between the collector and emitter of the transistor fil. connected in parallel.

Then, the figure 8 correction capacitor (11) and the modulation coil (
A second figure-eight correction capacitor (13) is connected between the connection point with 12) and the connection point of the first and second parallel circuits, and this capacitor (13) and the second parallel circuit A vertically periodic voltage VM from a modulation source (14) is supplied via a coil (15) to the connection point with the connection point of the modulation source (14). The connection point between the modulation source (14) and the coil (15) is connected to the capacitor (1
6).

In this case, the voltage VM supplied by the modulation source 4) is a downward parabolic wave as shown in FIG.

At this time, when the deflection current iy flows through the horizontal deflection coil (lO) in the direction of the arrow in the figure, the modulation coil (12)
A modulated current 1' by the voltage VM flows as shown in the figure.

Therefore, the horizontal deflection current iy is modulated with a vertical period by a parabolic wave voltage corresponding to the difference between the collector voltage Va of the transistor fil and the modulation voltage VM, and the left and right pin distortion is corrected.

In this case, since the voltage Va on the collector side of the horizontal output transistor (11) is not affected by the modulation voltage VM, the output voltage E on the dli I led out to the terminal (5)
There is also no variation in HV due to voltage VM, indicating good characteristics.

[Problem that the invention seeks to solve]

When the electron beam scans in the horizontal direction, the distance from the center of deflection is different between the center of the screen and the left and right edges of the screen, so the scanning distance of the electron beam is different even at the same deflection angle. In order to correct this, the slope part of the sawtooth wave, which is the horizontal deflection current waveform, is made to have an S-shape instead of a straight line. (13) Series capacitance)
is for this S-shaped armrest.

Here, if the distances from the center of deflection are equal between 1 and the intermediate part in the vertical direction of the art dealer, the 8-character correction amount may be constant.

However, in general, the distance from the center of deflection is far at the upper and lower ends of the inward direction, and closest at the center. Therefore, if the character-8 correction amount is constant, if the left and right pin distortion is corrected to zero at the left and right ends of the screen in the horizontal direction as shown in Figure 5, on the contrary, the left and right pin distortion will be reduced at the middle part. will arise.

In recent years, cathode ray tubes have become larger and their screens have become flatter, and for this reason, the distances from the center of deflection to the top and bottom edges of the screen and the distance nt from the center are larger than when the screen is curved. Since the deflection angle also increases, the amount of left and right bin distortion in the intermediate area increases (and its correction has become an important issue).

By the way, in the circuit shown in FIG. 3, this intermediate left and right pin distortion can be corrected to a certain extent by the F=J function. That is, in this example, the figure-8 correction is performed not only by the first figure-8 correction capacitor but also by the second figure-8 correction capacitor (13), and the 20th figure-8 correction capacitor (■3) Since the modulation current 1' flows, the figure 8 correction voltage is the variable a II 11 voltage V.
The upper F and center portions of the screen are made different by M, thereby correcting intermediate bin distortion.

In this case, to effectively correct both capacitors (11)
The capacitance of the capacitor (13) may be reduced while keeping the series capacitance of (13) constant. In other words, since the deflection current iy and the modulation current i' flow in the second figure-8 capacitor (13) in opposite directions, the smaller the capacitance of this capacitor (13), the more
■3) The figure-8 compensation voltage at both ends increases. Then, as shown in FIG. 6B, the difference between the figure-8 voltages between the upper and lower ends and the center of the screen can be increased, and the intermediate bin distortion can be corrected. In this case, as shown in FIG. 6, the S-shape correction is small at the h-edge of the screen, and the S-shape correction is large at the center.

From the above, if the capacitance of the second figure-8 fixed capacitor (13) can be made smaller under the condition that the series capacity of the first figure-8 correction capacitor (11) and this capacitor (13) is constant. In response to the increase in the size of cathode ray tubes and the use of fluorine tubes, it is possible to create left and right bin distortion lines without intermediate pin distortion.

However, when the deflection current iy increases, this current iy
S￥ generated in the second 8-figure correction capacitor (13) due to
It was confirmed that there is a phenomenon in which the tortoise pressure becomes too large and the modulation efficiency by the variable 6-cycle voltage VM decreases. That is,
In the conventional circuit shown in Fig. 3, the modulation current i' was controlled by moving the modulation voltage VM to correct pin distortion, so when the current i' becomes small to a certain extent, the loop of the modulation current i' and the loop of the deflection current iy are common. The figure 8 voltage due to the deflection current iy of the figure 8 capacitor (13) contained in the figure 8 shaft capacitor (13) increases, and the control in the direction of decreasing the variable δIM'1lfl flow i' (the direction in which the deflection current !y increases) becomes impossible. It becomes RoJ Noh.

As a result, the dynamic range of modulation for left and right bin distortion correction becomes extremely narrow, resulting in a disadvantage that left and right pin distortion correction becomes virtually impossible.

Therefore, in the conventional circuit, the capacitance of the second figure-8 correction capacitor (13) can only be reduced to a value that prevents the figure-8 voltage generated across it from becoming too large, and the intermediate bin distortion is reduced to a certain extent. This was insufficient for large cathode ray tubes with flat screens.

[Means for solving problems]

In this invention, the horizontal output switching element (11
and a damper diode +6, respectively), first and second parallel circuits configured by connecting f81 and a resonant capacitor (71 (91) in parallel, and a horizontal deflection coil (10).
and the first and second figure 8 correction capacitors (11) (13
), a modulation coil (20a), and an auxiliary coil (20a) connected to the modulation coil (20a) by a transformer.
b), the first and second parallel circuits are connected in series and connected in parallel to the horizontal output switching element (1), and the horizontal deflection coil (10) and the first figure-eight correction capacitor are connected in series. (11), the auxiliary iE coil (20b), and the modulation coil (20a) are connected in series and connected in parallel to the horizontal output switching element (1), and - the connection point of the first and second parallel circuits is connected in series. A second figure-8 correction capacitor (
13) to supply a vertically periodic parabolic wave to the connection point of the first and second parallel circuits.

[Effect]

This transformer (
By passing a deflection current through the correction coil (20b), which is the secondary coil of the second S ? Correction capacitor (13)
Even if the capacitance of is made small, a sufficient dynamic range can be obtained for right and left bin distortion correction.

〔Example〕

FIG. 201 shows an embodiment of the present invention, in which the conventional one-way modulation coil (12) has a transformer structure.

That is, in FIG. 1, the transformer (20) is
The primary winding (20a) of this transformer (20) corresponds to the modulation coil (12) of the conventional circuit. The secondary winding (20b) of this 1-lance (20) is connected in series to the first figure-8 correction capacitor (11), and one end of it is connected to the second figure-8 correction capacitor (13).
) and the primary winding (20a) of the transformer (20). In other words, the secondary A8 wire (20b) is placed in the loop through which the deflection current iy flows.In this case, the polarity of the transformer (20) is the same as shown in the figure.

In the above circuit, change i! J! d? '41 When the voltage v8 is increased by -1 and the deflection current iy is increased and the modulation current i' is decreased, the deflection current iy increases to 2 of the transformer (20).
Next volume! ! Since the polarity of this transformer is the same, an electromotive force is generated in the primary winding (20a) in the direction of decreasing the electric current /Jlf,1'. Therefore, the deflection current iy When it is large, even if the S-curve current iy of the second S-curve capacitor (13) becomes large, the modulation current i' can be made small, so the direction in which this current i' is made small is The dynamic range becomes extremely wide.

Therefore, in order to compensate for intermediate pin distortion, even if the capacitance of this second S' correction capacitor (13) is reduced, the dynamic range of left and right pin distortion correction is wide enough for practical use.
A highly efficient left and right pin distortion correction circuit can be realized.

In this case, due to the insertion of the secondary winding (20b) of the transformer (20), the figure 8 voltage due to the current iy of the capacitor (13) does not appear in Figure 2A, and is lower than in the conventional case (it does not appear in Figure 2B). However, the S-curve voltage IF at the center of the screen, C
It was experimentally confirmed that the S-curve voltage IEcO difference between the top and bottom edges of the screen remains unchanged.

Therefore, it can be seen from the dirt that the intermediate pin distortion is also sufficiently compensated.

As described above, even if the capacitance of capacitor (13) is made small while keeping the series capacitance of capacitors (11) and (13) constant, and the intermediate pin distortion is sufficiently corrected, It has been experimentally confirmed that pin distortion correction can be performed with a sufficiently wide dynamic range.

In other words, the inductance value of the deflection coil (10) is set to 0.
．． 82ml, transformer (20) winding ratio 7'7:2
0. The inductance value of the primary winding is 0.4 m)I, the first S-curve? The capacitance of the Ji stop capacitor (11) is 2.0μ.
F, 20th 7-Correction J1 Den'1 (13) When the capacitance ♀ was 0.56 μF, the residual intermediate pin distortion was 1% in the 2B type negative ray tube.

In addition, in the conventional circuit under the same dynamic range conditions, the capacitance of the capacitor (11) is 1.0.
μF, when the capacitance of the capacitor (13) is 1.0 μmt, 1iiiil the shadow of humanity +・! The amount of distortion in the intermediate pin remaining in the 18-wire tube was 3%, but according to this invention, the amount of distortion in the intermediate pin could be reduced to 1/3 of the conventional amount.

It was also confirmed through experiment 1 that a value on the secondary side of the winding ratio between 5 and 30 is practically sufficient.

〔Effect of the invention〕

According to the present invention, with a simple configuration in which the modulation coil has a transformer structure, it is possible to sufficiently correct the intermediate pin distortion while maintaining the dynamic range of the left and right bin 1'' V supplementary IE.

Therefore, this invention is very useful as a horizontal deflection circuit for large-scale cathode ray tubes used by art dealers.
Its effects are significant in practical use.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a waveform diagram for explaining its main parts, Fig. 3 is a circuit diagram of an example of a conventional circuit, and Fig. 4 is an explanation of its main parts. FIG. 5 is a diagram for explaining the correction screen by the conventional circuit, and FIG. 6 is a waveform diagram for the first part. (1) is a horizontal output transistor, (6) and (8) are damper diodes, (7) and (9) are resonance capacitors, (109 is a deflection coil, (11) is the first figure-8 correction capacitor, ( 13) is the second figure 8 correction capacitor, (1
4) is the modulation source, (20) is the transformer, (20a) is the primary winding of the I-lance (20) which becomes the variable d frequency coil, (
20b) is the secondary winding of the transformer (20) which serves as the lottery coil.

Claims (1)

[Claims] A horizontal output switching element, first and second parallel circuits configured by connecting a damper diode and a resonant capacitor in parallel, a horizontal deflection coil, and first and second S The first and second parallel circuits are connected in series and connected in parallel to the horizontal output switching element. The horizontal deflection coil, the first S-shaped correction capacitor, the correction coil, and the modulation coil are connected in series, and the series circuit is connected in parallel to the horizontal output switching element, and the first and second S-shaped correction capacitors are connected in series. The second S-shaped correction capacitor is connected between the connection point of the second parallel circuit and the connection point of the correction coil and the modulation coil, and the second S-shaped correction capacitor is connected to the connection point of the first and second parallel circuits. A horizontal deflection circuit that is supplied with parabolic waves.