JPH0370270A - Horizontal deflection/high voltage circuit - Google Patents

Abstract

PURPOSE:To prevent noise due to a surge voltage from appearing on the screen by devising the circuit such that an output transistor(TR) controlling power voltage is turned on or off within the horizontal fly-back period. CONSTITUTION:A surge voltage takes place in a power voltage outputted from a high voltage stabilizing means 30 when an output TR 301 in the high voltage stabilizing means 30 is turned on and off. There is a possibility of generating noise in a horizontal deflection current by the surge voltage. Then the TR 301 is turned on or off for the horizontal fly-back period. Thus, either of the surge voltages generated at turn-on or at turn-off is prevented to affect on the pattern.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a horizontal deflection/high voltage circuit for a display device such as a television receiver using a cathode ray tube.
This invention relates to a horizontal deflection/high voltage circuit that can accommodate more than one type of horizontal frequency.

[Conventional technology]

Horizontal deflection of display devices such as television receivers
There are two types of high-voltage circuits: a method in which the horizontal deflection circuit and the high-voltage circuit are separated into separate circuits (hereinafter referred to as the separate method), and a method in which the horizontal deflection circuit and the high-voltage circuit are integrated (hereinafter referred to as the integrated method). , there are two methods.

The integrated system has the advantage that the circuit scale can be reduced and the cost can be reduced compared to the separate system. However, on the other hand, it has been difficult to simultaneously achieve both high voltage stabilization, which keeps the high voltage constant in response to load fluctuations, and horizontal deflection current stabilization, which keeps the horizontal deflection current constant.

As a known example of an integrated type horizontal deflection/high voltage circuit that solves the above-mentioned problems, for example, Japanese Patent Laid-Open No. 58-1381
There is one described in Publication No. 79.

This known example will be explained using FIG. 6.

FIG. 6 is a circuit diagram showing a conventional horizontal deflection/high voltage circuit. In FIG. 6, 1 is a horizontal output transistor, 2 is a first damper diode, 3 is a second damper diode,
4 is a first resonant capacitor, 5 is a second resonant capacitor, 6 is a horizontal deflection coil, 7 is a first scanning capacitor, 8
9 is a modulation coil, 9 is a second scanning capacitor, 10 is a flyback transformer, 11 is a high voltage rectifier diode, 12 and 13 are high voltage dividing resistors, 20 is a horizontal output transistor 1
30 is a high voltage stabilizing circuit; 40 is a high voltage stabilizing circuit;
is the horizontal deflection current control circuit.

In the case, Eo is the DC voltage, BB is the output voltage of the high voltage stabilizing circuit 50, the voltage input to the flyback transformer 10, and EM is the high voltage obtained by rectifying the voltage generated on the secondary side of the flyback transformer. , EIll is the output voltage of the horizontal deflection current control circuit 40, and the voltage applied to the second scanning capacitor (9) is the horizontal deflection current flowing through the horizontal deflection coil 6. represents the collector current flowing into the horizontal output transistor 1, and represents the beam current flowing from the secondary side of the flyback transformer into the cathode ray tube (not shown).

First, the operation of the high voltage stabilizing circuit 30 will be described.

In the diagram t46, the resonant frequency of the horizontal deflection coil 6 and the first resonant capacitor 4 and the resonant frequency of the modulation coil 8 and the second resonant capacitor 5 are set to be approximately equal. The time that is half of this resonance period (hereinafter referred to as horizontal retrace period) is set as TR. We met, one horizontal period is TH
Then, high pressure is generally expressed by the following formula.

Here, α is a constant determined by the turn ratio of the flyback transformer 10, etc. However, in reality, when a bright screen is displayed, the beam current flow increases and the high voltage BII is lowered, and when a dark screen is displayed, the beam current flow decreases and the high voltage MH decreases. Go up. In order to correct this, the high voltage stabilization circuit 30 detects the high voltage EI and increases the input voltage B, t- to the flyback when a bright screen is displayed, and increases the input voltage B, t- when a dark screen is displayed.
.

It works to lower the pressure and keep the high pressure constant.

Next, the operation of the horizontal deflection current control circuit 40 will be described.

FIG. 7 is a waveform diagram showing the waveform of the horizontal deflection current Ix in FIG. 6 for one horizontal period. In FIG. 7, IrH is one horizontal period, h is a horizontal retrace period, and T8 is a period during which an image is displayed on the screen (hereinafter referred to as a horizontal display period). lta, engineering I
ll is the amount of change in k in the horizontal display period, I, and □ is k in the Mizuko period.

is the peak-to-p@ak value. Here, if the inductance of the horizontal deflection coil 6 is L, then .

and "YPP" are generally expressed by the following formula.

Due to the function of the high voltage stabilizing circuit 30 described above, the input voltage to the flyback transformer 10 is 1! , varies, the expression (
From 2), "ya also changes. When Yl changes, the size of the displayed video screen (hereinafter referred to as display screen size) also changes. In order to correct this, the horizontal deflection current control circuit 40 , when the high voltage stabilizing circuit 30 varies E, the voltage across the second scanning capacitor 70 E,
Let's make it have the same amount of variation as EB.
is kept constant. Therefore, the display screen size is also kept constant.

[Problem to be solved by the invention]

As described above, the above-mentioned known example can keep the high voltage constant against changes in the high voltage load, and can also keep the horizontal deflection current constant. However, no consideration was given to support for horizontal frequencies higher than S2S, so-called multi-frequency support.

This point will be discussed in detail below.

The first is regarding the high voltage stabilization circuit. That is, in order to keep the high voltage constant when the horizontal frequency changes, the output voltage EB of the high voltage stabilizing circuit must be changed. For example, when the horizontal frequency increases, it is necessary to increase the output voltage El of the high voltage stabilizing circuit. This can be seen from the condition for keeping the high pressure EH constant in the above-mentioned equation (1). On the other hand, the circuit shown in FIG. 6 uses a series regulator system for the high voltage stabilizing circuit. However, in the series regulator system, the loss of the output transistor is proportional to the voltage across the transistor (!!o-g,), so when the output voltage El is lowered, the loss of the output transistor increases, so E is variable. The range cannot be increased. Therefore, the series regulator type high voltage stabilizing circuit is not suitable for multi-frequency support.

Therefore, instead of using the series regulator method, we will consider using a tilt-flange type gear type in the high voltage stabilizing circuit. Since the chip-shaped girder method controls the switching of the output transistor, the loss of the output transistor is only the switching loss, and the output voltage HB
The variable range can be increased. Therefore, it is suitable for multi-frequency support. However, on the other hand, there is a problem in that a switching surge voltage is generated when the output transistor is turned on and turned off. That is, this surge voltage is
It may affect the horizontal deflection current and cause noise on the screen.

The second point concerns the horizontal deflection current control circuit.

That is, in the circuit shown in FIG. 6, no consideration was given to supporting two or more types of horizontal frequencies. That is, when the horizontal frequency changes and the horizontal display period changes, when the display screen size changes, the amount of water changes.

The third point concerns the side pin distortion correction voltage generation circuit. That is, when dealing with two or more types of horizontal frequencies, the appropriate amount of side pin distortion correction is different for each horizontal frequency, but in the circuit of FIG. 6, simply! By simply inputting a parabolic waveform voltage with a period of llI to the horizontal deflection current control circuit, side pin distortion was corrected only with a fixed amount of side pin distortion correction.

The present invention has been made in view of the above-mentioned three problems of the prior art.Accordingly, the first object of the present invention is to solve the problem even when the high voltage stabilizing circuit is in the form of a chip and a generator system is used. The second purpose is to provide a horizontal deflection/high voltage circuit that does not cause noise due to surge voltage to appear on the screen. By providing a high voltage circuit, the 30th objective is to provide a horizontal deflection/high voltage circuit that can perform appropriate side pin distortion correction for each horizontal frequency even if the horizontal frequency changes. .

[Means to solve the problem]

In order to achieve the above first object, the present invention switches the output transistor in the high voltage stabilizing means at a period n (where n is an integer of 1 or more) times the horizontal period,
Moreover, it is arranged to turn on or turn off within the horizontal retrace period.

In order to achieve the above-mentioned second object, in the present invention, the horizontal deflection current control means is provided with a level shift means, and the level shift means controls the input side of the flyback transformer in response to changes in the horizontal frequency. Either the variation of the power supply voltage supplied to one terminal is level-shifted and applied to one of the connection points at both ends of the modulation coil, or the horizontal deflection current control means has an alternating current component. An extracting means is provided, and the alternating current component extracting means extracts only the alternating current component of the variation in the power supply voltage and applies it to the connection point.

In order to achieve the above-mentioned third object, the present invention includes a parabolic waveform voltage generating means for generating a parabolic waveform voltage with a vertical period, and a switching means for switching the amplitude of the parabolic waveform voltage in response to a change in horizontal frequency. and superimposing the parabolic waveform voltage on the variation of the power supply voltage,
The voltage was applied to the connection point.

[Effect]

When the output transistor in the high-voltage stabilizing means is turned on and the FiFP is turned off, a surge voltage is generated in the power supply voltage that is output from the high-voltage stabilizing means.

This surge voltage may cause noise in the horizontal deflection current. However, in the present invention, as described above, since the output transistor can be turned on or turned off during the horizontal retrace period, either the surge voltage generated at turn-on or the surge voltage generated at turn-off affects the screen. can be prevented from giving.

Further, in the present invention, the level shift means in the horizontal deflection current control means changes the output voltage E of the horizontal deflection current control means in response to changes in the horizontal frequency, and the DC voltage (EB -1 can be controlled. As a result, even if the horizontal frequency force ((Ell-B,) T8 changes), it is possible to keep it constant even if the horizontal frequency power (switching or horizontal display period T8 changes).

Tsu-! b. The amount of change in the horizontal deflection current during the horizontal display period TB, which is determined by the above-mentioned equation (2), can be kept constant. Therefore, the display screen size is I,
, is proportional to i/C, so even if the horizontal frequency changes,
The display screen size can be kept constant.

Furthermore, in order to keep the high voltage m constant, the high voltage stabilizing means changes the output voltage B in response to two changes: a change in the high voltage load and a change in the horizontal frequency. Of the two changes above, the high pressure load changes every horizontal cycle, whereas
The horizontal frequency changes only when switching input signals. Therefore, when the horizontal frequency changes, the DC component of the output voltage (the power supply voltage) BB of the high voltage stabilizing circuit changes.

In the present invention, the alternating current component of the variation in the output voltage BfB is extracted by the alternating current component extraction means in the horizontal deflection current control means, and the direct current component of the variation is removed, so that the output voltage of the horizontal deflection current control means]! Let's say im. Thereby, when the high voltage load changes, the DC voltage (KB-E,) applied to the horizontal deflection coil is kept constant. Moreover, at this time, the horizontal display period? Since 8 is also constant, (B, -Byu)・!
8 is kept constant. On the other hand, the horizontal frequency is higher (lower)
If the DC voltage applied to the horizontal deflection coil (
EB-Fl,) becomes larger (smaller), but is it the horizontal display period? 8 becomes smaller (larger) to 1. Therefore, by appropriately setting the first bias point of the output voltage B of the horizontal deflection current control means, even if the horizontal frequency changes (E,
-E,)・! , can be kept constant. That's all,
Horizontal display period determined by equation (2) above! Since the amount of change I□ in the horizontal deflection current at 8 is constant, the display screen size is kept constant.

Further, in the present invention, the switching means can obtain parabolic waveform voltages with vertical periods and optimal amplitudes corresponding to the respective horizontal frequencies. Then, by superimposing the parabolic waveform voltage on the variation of the power supply voltage and applying it to the connection point, optimal side pin distortion correction can be performed for each horizontal frequency.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

In FIG. 1, 1 is a horizontal output transistor, 2 is a first
damper diode, 3 is the second damper diode, 4
is the gl resonant capacitor, 5 is the second resonant capacitor,
6 is a horizontal deflection coil, 7 is a first scanning capacitor, 8 is a modulation coil, 9 is a second scanning capacitor, 10 is a flyback transformer, 11 is a high-voltage rectifier diode, and 12 and 13 are high-voltage dividing resistors. Further, 20 is a drive circuit that drives a horizontal output transistor, 30 is a high voltage stabilization circuit, 40 is a horizontal deflection current control circuit, 60 is a side pin correction voltage generation circuit, 70 is a monostable multivibrator, 8
0 is a horizontal oscillation circuit.

First, the high voltage stabilizing circuit 30 will be explained.

The high-voltage stabilizing circuit 30 shown in FIG. 1 is a high-voltage stabilizing circuit using a step-down type carbon dioxide brim type gierator system, and includes an output transistor 301, a flywheel diode S02,
It is composed of a circuit coil 303, a smoothing capacitor 504, and a pulse width control circuit 505.

In this high voltage stabilization circuit 30, the pulse width control circuit 305
This changes the conduction time of the output transistor 301 and controls its output voltage FiB. Further, the output signal of the horizontal oscillation circuit 80 that is input to the pulse width control circuit 305 is input via the monostable multivibrator 70 .

In the step-down chip type generator system, the surge voltage generated at turn-on is generally larger than the surge voltage generated at turn-off, so conventionally,
As shown in &), noise may be generated on the screen due to the surge voltage generated when the output transistor 301 is turned on.

In contrast, in this embodiment, the phase is adjusted by the monostable multivibrator 70, and the output transistor 501 is turned on during the horizontal retrace period. As a result, Fig. 2(b)
As shown in , you can prevent noise from occurring on the screen.

Next, the horizontal deflection current control circuit 40 will be explained.

The horizontal deflection current control circuit wI40 in the 1m1 diagram is the amplifier 40.
4. Addition circuit 405, level shift circuit wr40? Consists of.

Level shift circuit j13409 switches the level shift amount at the same time as the horizontal frequency changes. By setting the level shift amount for each horizontal frequency in advance, even when the horizontal frequency is switched, the video can be displayed at an appropriate screen size at each horizontal frequency.

FIG. 3 shows a specific circuit configuration of the level shift circuit shown in FIG. 1.

The level shift circuit shown in FIG.
and 403, transistors 406 and 407, resistor 40
Consists of 8. The switch means 401 switches the DC bias of the output voltage E of the horizontal deflection current control circuit 40 at the same time as the horizontal frequency changes.

Next, the side pin distortion correction voltage generation circuit 60 will be explained.

11th i! ! 1 side pin distortion correction voltage generation times W & 60
For example, switch means 601, parabolic waveform generation circuit 602
, variable resistors 605 and 604. The switch means 601 switches the amplitude of the vertical period parabolic waveform voltage applied to the addition port wr 405 at the same time as the horizontal frequency is switched. By adjusting the variable resistors 603 and 604 for each horizontal frequency, a parabolic waveform voltage of optimum amplitude is superimposed on the output voltage of the level shift @ path 409. As described above, it is possible to perform optimal side pin distortion correction corresponding to each horizontal frequency.

Hereinafter, as a technology related to the present invention, a technology for supporting two or more types of horizontal frequencies will be described.

First, the technology related to the drive circuit 20 will be described.

The drive time wr20 in FIG. 1 is the drive transformer 20.
1. Consists of a drive transistor 202, a resistor 205, a capacitor 204, and a resistor 205. The drive circuit Bzo in FIG. 1 is characterized in that its power supply voltage is supplied from the output voltage B of the high voltage stabilization circuit 30. When the horizontal frequency changes, the output voltage B of the high voltage stabilizing circuit also changes, and therefore the base current of the horizontal output transistor 10 also changes. Therefore, by adjusting the resistor 205, the optimum base voltage 'fI1. IB can be provided.

Next, technology related to the horizontal oscillation circuit 80 will be described.

The horizontal oscillation circuit 80 in FIG. 1 includes a switch means 801,
A resistor 802, a capacitor 803, a resistor 804, and a capacitor 805 are connected. The rerun frequency of the horizontal oscillation circuit 8007 is determined by a time constant determined by the resistor 802 and the capacitor 204 or by a time constant determined by the resistor 804 and the capacitor 805. That is, the rerun frequency of the horizontal oscillation circuit 8007 is switched by switching the switch means 801 in response to changes in the horizontal frequency. Therefore, resistors 802 and 804, capacitor 2
By adjusting 04 and 805, the oscillation frequency of the horizontal oscillation circuit 80 can be reliably synchronized with the horizontal synchronization signal even if the horizontal frequency or horizontal display position changes.
Moreover, the display position of the screen can be kept constant.

Next, other embodiments of the present invention will be described.

FIG. 4 is a circuit diagram showing a high voltage stabilizing circuit in another embodiment of the present invention.

In this embodiment, the circuits other than the high voltage stabilizing circuit 31 are as follows:
This is similar to the embodiment shown in FIG.

Now, the high voltage stabilizing circuit 51 in this embodiment will be explained.

The high voltage stabilizing circuit 51 shown in FIG. 4 uses a step-up type chimney-shaped gear, which is different from the high voltage stabilizing circuit @SO in the embodiment shown in FIG.

That is, the high voltage stabilizing circuit 51 in FIG.
Consists of. In this embodiment, the high voltage stabilizing circuit 3
1, the conduction time of the output transistor 306 is changed so that the high voltage remains constant, as in the embodiment shown in FIG.
Its output voltage E is controlled.

In step-up type transistors, as with step-down types, the surge voltage generated at turn-off is generally greater than the surge voltage generated at turn-off, and has no effect on the screen. There is a great possibility of giving.

Therefore, in this embodiment, the effect of the surge voltage at the time of turn-on is removed from the screen by turning on the output transistor 306 during the horizontal retrace period.

Note that in this embodiment and the embodiment shown in FIG. Even if the output transistor is turned off during the horizontal retrace period, the same effect can be obtained.

Next, another embodiment of the present invention will be described.

FIG. 5 is a circuit diagram showing a horizontal deflection current control circuit in another embodiment of the present invention.

In this embodiment, the circuits other than the horizontal deflection current control circuit 41 are the same as those in the embodiment shown in FIG.

Now, the horizontal deflection current control circuit 41 in this embodiment will be explained.

The horizontal deflection current control circuit 41 in FIG. 5 differs from the embodiment in FIG.
0, resistors 411 and 412.

In this embodiment, the horizontal deflection current control circuit 41 removes the output voltage EB (D) of the high voltage stabilizing circuit 30 with a capacitor 501, inputs only the AC component to the addition circuit 410, and The output voltage B1 of the horizontal deflection current control circuit 40 changes when the high voltage load changes, but does not change when the horizontal frequency changes.

On the other hand, when the level shift circuit 409 is used as in the embodiment shown in FIG.
Since the DC bias of sB changes, B also changes. For this reason, it was necessary to change the amount of level shift. However, in this embodiment, since the B and 0TIL flow biases are constant, a switching switch is not required. In other words, if the DC bias point at the foot of the output voltage of the horizontal deflection current control circuit 40 is set appropriately, (m, -g,)·T8 can be kept constant for two different horizontal frequencies, so that one display Screen size can be kept constant.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to use the g-flange type regulator system, which is advantageous for reducing loss, in the high-voltage stabilizing circuit, and it is possible to remove the noise caused by the surge voltage, which is a problem at that time, from the screen. I can do it.

Furthermore, according to the present invention, the display screen size can be kept constant even if the horizontal frequency changes.

In particular, when the alternating current component extracting means is used, the above-mentioned effects can be achieved without using a switch or the like for switching the level shift diet.

Further, according to the present invention, even if the horizontal frequency changes, appropriate side pin distortion correction can be performed for each horizontal frequency.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing one embodiment of the present invention, and Fig. 2 is a circuit diagram showing an embodiment of the present invention.
A waveform diagram showing the main signal waveforms in the figure, Figure 3 is a concrete circuit of the level shift circuit of Figure 1! FIG. 4 is a circuit diagram showing a high voltage stabilizing circuit in another embodiment of the present invention, and FIG. 5 is a circuit diagram showing a horizontal deflection current control circuit in another embodiment of the present invention. , FIG. 6 is a circuit diagram showing a conventional horizontal deflection/high voltage circuit, No. 71i! iX is a waveform diagram showing the horizontal deflection current waveform of FIG. 1...Horizontal output transistor 2...
...First damper diode 3...
-Second damper diode 4...First resonant capacitor 5...Second resonant capacitor 6...Horizontal deflection coil 7 ......First scanning capacitor 8...
...Variable lI coil 9...Second scanning capacitor 501...
-Flyback transformer 11...High voltage rectifier diode 20...Drive circuit 30...High voltage stabilization circuit 40...Horizontal deflection current control circuit 60... ...
・Side pin correction waveform generation circuit. 2nd Prisoner Ca) Junior - Natsume 5th Figure 40'j Tsuta 4th Side Pinne Tsuna Shodenso L Figure 6 0 Figure

Claims (1)

[Claims] 1. At the output terminal of the horizontal output transistor, the cathode of the first damper diode, one end of the first resonant capacitor, a horizontal deflection coil and a first scanning capacitor connected in series are connected. one end of the first resonant circuit and one end of the input side of the flyback transformer are respectively connected, and the anode of the first damper diode, the other end of the first resonant capacitor, and the first resonant circuit are connected. and the other ends are commonly connected to each other, and the cathode of the second damper diode, one end of the second resonant capacitor, and the modulation coil and second scanning capacitor connected in series are connected to the common connection point. the anode of the second damper diode, the other end of the second resonant capacitor, and the other end of the second resonant circuit are respectively grounded. a high voltage stabilizing means for controlling the power supply voltage supplied to the other terminal on the input side of the flyback transformer so that the high voltage outputted from the output side of the flyback transformer is constant; so that the horizontal deflection current flowing through the deflection coil is constant.
A horizontal deflection/high voltage circuit comprising horizontal deflection current control means for applying a variation in the power supply voltage to one of the connection points at both ends of the modulation coil, wherein the high voltage stabilization means includes: The output transistor is provided with an output transistor that controls the power supply voltage by changing its conduction time, and the output transistor switches at a period n (where n is an integer of 1 or more) times the horizontal period, and A horizontal deflection/high voltage circuit that is characterized by turning on or turning off during the retrace period. 2. At the output terminal of the horizontal output transistor, connect the cathode of the first damper diode, one end of the first resonant capacitor, and one end of the first resonant circuit consisting of the horizontal deflection coil and the first scanning capacitor connected in series. and one end of the input side of the flyback transformer, and the anode of the first damper diode, the other end of the first resonant capacitor, and the other end of the first resonant circuit. A second resonant circuit consisting of a cathode of a second damper diode, one end of a second resonant capacitor, and a modulation coil and a second scanning capacitor connected in series; and the anode of the second damper diode, the other end of the second resonant capacitor, and the other end of the second resonant circuit are respectively grounded. a high voltage stabilizing means for controlling a power supply voltage supplied to another terminal on the input side of the flyback transformer so that the high voltage outputted from the output side of the back transformer is constant; and a horizontal deflection flowing through the horizontal deflection coil. so that the current is constant,
A horizontal deflection/high voltage circuit comprising horizontal deflection current control means for applying a variation in the power supply voltage to one of the connection points at both ends of the modulation coil, the horizontal deflection current control means comprising: , a horizontal deflection/high voltage circuit comprising a level shift means, the level shift means level-shifting a variation in the power supply voltage in response to a change in horizontal frequency, and applying the level-shifted amount to the connection point. . 3. At the output terminal of the horizontal output transistor, connect the cathode of the first damper diode, one end of the first resonant capacitor, and one end of the first resonant circuit consisting of the horizontal deflection coil and the first scanning capacitor connected in series. and one end of the input side of the flyback transformer, and the anode of the first damper diode, the other end of the first resonant capacitor, and the other end of the first resonant circuit. A second resonant circuit consisting of a cathode of a second damper diode, one end of a second resonant capacitor, and a modulation coil and a second scanning capacitor connected in series; and the anode of the second damper diode, the other end of the second resonant capacitor, and the other end of the second resonant circuit are respectively grounded. a high voltage stabilizing means for controlling a power supply voltage supplied to another terminal on the input side of the flyback transformer so that the high voltage outputted from the output side of the back transformer is constant; and a horizontal deflection flowing through the horizontal deflection coil. so that the current is constant,
A horizontal deflection/high voltage circuit comprising horizontal deflection current control means for applying a variation in the power supply voltage to one of the connection points at both ends of the modulation coil, the horizontal deflection current control means comprising: . A horizontal deflection/high voltage circuit, comprising an alternating current component extracting means, the alternating current component extracting means extracting an alternating current component in the variation of the power supply voltage, and applying the extracted alternating current component to the connection point. 4. At the output terminal of the horizontal output transistor, connect the cathode of the first damper diode, one end of the first resonant capacitor, and one end of the first resonant circuit consisting of the horizontal deflection coil and the first scanning capacitor connected in series. and one end of the input side of the flyback transformer, and the anode of the first damper diode, the other end of the first resonant capacitor, and the other end of the first resonant circuit. A second resonant circuit consisting of a cathode of a second damper diode, one end of a second resonant capacitor, and a modulation coil and a second scanning capacitor connected in series; and the anode of the second damper diode, the other end of the second resonant capacitor, and the other end of the second resonant circuit are respectively grounded. a high voltage stabilizing means for controlling a power supply voltage supplied to another terminal on the input side of the flyback transformer so that the high voltage outputted from the output side of the back transformer is constant; and a horizontal deflection flowing through the horizontal deflection coil. so that the current is constant,
A horizontal deflection/high voltage circuit comprising: horizontal deflection current control means for applying a variation in the power supply voltage to one of the connection points at both ends of the modulation coil; A parabolic waveform voltage generating means is provided, and a switching means is provided for switching the amplitude of the parabolic waveform voltage in response to a change in horizontal frequency, the parabolic waveform voltage is superimposed on the variation of the power supply voltage, and the connection is performed. A horizontal deflection/high voltage circuit characterized by applying voltage to a point.