JPH0487474A - High voltage generating circuit - Google Patents

Abstract

PURPOSE:To make a horizontal deflection amplitude without a bent pattern by feeding back a voltage detection signal equivalent to a horizontal deflection current to a high voltage detection detected by a high voltage detection section so as to generate a comparison object voltage and adding a correction voltage corresponding to a voltage drop with respect to a reference voltage to a high voltage side of a flyback transformer. CONSTITUTION:A change component in a peak rectified voltage of an S-shape correction capacitor detected by a deflection current detection section 55 is fed back negatively to a high voltage detection voltage e6 detected by a high voltage detection section 9 to subtract the change component from the high voltage detection voltage e6 to generate a comparison object voltage ec, and a voltage corresponding to the drop of the comparison object voltage ec with respect to the reference voltage is used as a correction voltage and it is added to a secondary side of a flyback transformer. Thus, the drop of the high voltage output voltage caused by flowing of a video signal or the like and a change in a peak rectified waveform of a horizontal deflection current are balanced to prevent the change in the horizontal deflection amplitude in the correction of the high output voltage is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high voltage generating circuit for a television receiver or a display device, which is equipped with means for stabilizing high voltage and horizontal deflection amplitude.

[Conventional technology]

Recently, new media (teletext broadcasting, satellite broadcasting, CA
With the spread of television (TV), the screens of television receivers are becoming larger, higher in definition, and lower in cost. Furthermore, as personal computers used at home are upgraded, the performance and cost of display devices are also being improved and reduced.

In order to reduce the cost of these television receivers and display devices, a high voltage generation circuit (generally called a resonant type high voltage generator circuit) that integrates a horizontal deflection output circuit and a high voltage circuit including a flyback transformer has been developed. By reducing the number of parts, the cost of the device can be reduced.

Furthermore, stabilization of the screen as the screen of a cathode ray tube increases in size and definition can be achieved by stabilizing the horizontal amplitude of the screen. In general, the horizontal deflection amplitude! , when the horizontal deflection current is Ifl'i' and the high voltage output voltage is Hv,
The following relationship holds between P, ID and Hv.

Q cc I Dr/ (Hv)"" ... (1) In other words, the horizontal deflection amplitude is proportional to the horizontal deflection current I DY,
It is inversely proportional to the 172nd power of the high voltage output voltage Hv. Focusing on this relationship, various screen stabilization methods have been used.

One of them is to control the primary current of a bias power supply provided on the low-voltage coil side of the flybank transformer to keep the high-voltage output voltage Hv constant and stabilize the screen amplitude.

However, the method for controlling the current of the bias power supply on the -next side requires that the current on the -next side is a large current, and that a large-capacity capacitor is installed on the -next side to absorb the reverse current flowing through the damper diode. As a result, the time constant for charging and discharging the capacitor becomes large, which inevitably slows down the response speed for stabilizing the high voltage output voltage Hv. Furthermore, when Hv changes, the horizontal deflection current IDY also changes at the same time. Moreover, that I. Since the response characteristic to 7 is faster than the response to Hv, there is a problem in that unnatural screen distortion occurs.

In order to eliminate such problems as much as possible, the current response of the bias power supply is slowed down to a certain extent, a large-capacity high-voltage capacitor is used, and the current of the bias power supply is controlled for low frequency components, and high frequency components are Some devices employ a method of bussing the bias current using the high-voltage capacitor. However, with the method of controlling each band in the low frequency region and high frequency region, the intermediate frequency region becomes a blank region that is not controlled, and the screen may expand or contract as the frequency changes. In interlace mode, there was a problem that frame shift occurred, and this method of screen stabilization required an extremely large capacity and expensive capacitor, which was an obstacle to reducing the cost of the device. .

On the other hand, as a method for controlling the horizontal deflection current IDY, there is a method that employs a diode modulator or the like, but this method has the same drawback that the response is inherently poor and the stabilization of the screen cannot be precisely controlled.

[Problem to be solved by the invention]

As mentioned above, the method of stabilizing the screen on the primary side has a limit in stabilizing the screen with high precision with a simple device configuration. In order to do this, a method is being adopted in which a correction voltage corresponding to the amount of drop in the high voltage output voltage Hv is directly added to the secondary side. This type of method has a fast response speed for high pressure stabilization (,
It has the advantage that it can cover most of the frequency range from low frequencies to high frequencies, and that it does not significantly affect other tertiary outputs provided on the negative side or the secondary side.

However, since the energy of the horizontal deflection coil is supplied from a flyback transformer, for example, when a dark screen suddenly changes to a bright screen, a high-voltage output current flows to the cathode ray tube side on the secondary side. The current on the next side is taken to the secondary side, and as a result, there is a problem that the horizontal deflection current is insufficient and the screen amplitude changes.Similarly, when applying a correction voltage for the drop in the high voltage output voltage Hv, To,
There is a problem in that when the high-voltage output current suddenly flows, the horizontal deflection current changes, causing unsightly waviness on the screen. For example, if a high-voltage output current flows to the secondary side due to changes in screen brightness, etc., and the high-voltage output voltage drops, as shown in Figure 6 (
The signal pattern shown in a) becomes a pattern deformed into a trapezoidal shape as shown in the same figure (B), but even if this is corrected by adding a correction voltage to the secondary side, the signal pattern shown in the same figure (C) There is a problem in that such undulations occur.

In this way, in a resonant type high voltage generation circuit that integrates a horizontal deflection output circuit and a high voltage circuit, the horizontal deflection output circuit is connected to the high voltage side via a flyback transformer, so it is inevitable that the screen brightness will be affected. If a high-voltage output current flows due to a change in temperature, etc., or if a correction voltage is suddenly applied to the secondary side, the horizontal deflection current will inevitably change, and the high-voltage output voltage Hv
Since the response speed of the horizontal deflection current 1flY and the horizontal deflection current 1flY are different, the method of detecting the amount of drop in the high voltage output voltage and directly adding a correction voltage corresponding to the amount of drop to the secondary side (than the method of controlling the negative side) However, since it does not take into account changes in the horizontal deflection current, there is a problem in that there is a limit to stabilizing the screen amplitude.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to suppress fluctuations in horizontal deflection amplitude when stabilizing a high voltage output voltage by adding a correction voltage to the secondary side. An object of the present invention is to provide a high voltage generation circuit that can simultaneously stabilize the screen.

[Means to solve the problem]

In order to achieve the above object, the present invention is configured as follows. That is, the present invention provides a horizontal deflection output circuit including a deflection yoke, a flyback transformer that boosts a flyback pulse generated by the horizontal deflection output circuit to apply a high output voltage to an anode of a cathode ray tube, and A high voltage detection means for detecting voltage, and a comparison target voltage based on the detected voltage of the high voltage detection means. ! A high voltage generation circuit comprising a high voltage stabilizing circuit that includes a comparison unit for comparing the voltage and a high voltage stabilizing circuit that applies a correction voltage to the high voltage side (secondary side) of the flyback transformer according to the amount of drop of the voltage to be compared with respect to the base fs voltage, a deflection current detection section that directly or indirectly detects the deflection current of the horizontal deflection coil constituting the deflection yoke as a voltage component; and a peak rectification of the signal detected by the deflection current detection section, and a peak rectification voltage. Subtract the voltage corresponding to the changing component of from the high voltage detection voltage,
The present invention is characterized by comprising a comparison target voltage generating circuit which applies this subtracted remaining voltage as a comparison target voltage to the comparison section of the high voltage stabilizing circuit.

[Effect]

In the present invention, the high voltage output voltage during circuit operation is detected by the high voltage detection means, and the deflection current flowing through the horizontal deflection coil is detected as a voltage signal by the deflection current detection section.

For example, when the screen of a cathode ray tube suddenly changes from a dark screen to a bright screen, a high voltage output current flows from the high voltage side of the flyback transformer to the cathode ray tube, causing the high voltage output voltage to drop.

At this time, the current flowing in the horizontal deflection current is taken to the high voltage output current side, so that the horizontal deflection current decreases. The amount of drop in the vertical deflection voltage is detected by a high voltage detection means, and the change in the horizontal deflection current is detected as a voltage signal by a deflection current detection section. Then, the voltage signal detected by the deflection current detection section is subjected to peak rectification and DC component cutting in a signal processing circuit, for example, and a change component of the peak rectification voltage (corresponding to a change component of the peak rectification waveform of the horizontal deflection current). is taken out.

A comparison target voltage generation circuit generates a comparison target voltage by determining the difference between the detected voltage detected by the high voltage detection means and the change component of the peak rectified voltage extracted by the signal processing circuit,
Add this to the comparison section of the high voltage stabilization circuit. The comparison section compares the voltage to be compared with the reference voltage, and applies a correction voltage corresponding to the amount of drop in the voltage to be compared with respect to the reference voltage to the high voltage side of the flyback transformer, ensuring stabilization of the horizontal deflection amplitude and outputting high voltage. Achieve voltage stabilization.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 1 shows a circuit diagram of an embodiment of a high voltage generating circuit according to the present invention. This high voltage generation circuit includes a horizontal deflection output circuit 1, a flyback transformer 2, a high voltage detection section 9 as a high voltage detection means, a high voltage stabilization circuit 54, a deflection current detection section 55, a signal processing circuit 56, It consists of a comparison target voltage generation circuit 57. Among these, the horizontal deflection output circuit 1, the flyback transformer 2, the high voltage detection section 9,
Since the high-voltage stabilizing circuit 54 is known from Japanese Patent Laid-Open No. 1-194760, etc., the explanation thereof will be simplified.

The horizontal deflection output circuit 1 includes a horizontal output transistor 4, a damper diode 5, a resonant capacitor 6, a horizontal deflection coil 7, and a figure-8 correction capacitor 8. The horizontal output transistor 4 performs a switching action upon receiving the voltage pulse sent from the horizontal drive circuit, and applies a sawtooth wave current to the horizontal deflection coil 7 in cooperation with the damper diode 5. On the other hand, the resonant capacitor 6 and the horizontal deflection coil 7 generate a flyback pulse by their resonance, which is transferred to the flyback transformer 2.
Add to.

The flyback transformer 2 consists of a core 10 wound with a low voltage coil 11 and a high voltage coil 12.
] One end of the coil 11 is connected to the collector side of the horizontal output transistor 4, and the other end of the coil 11 is connected to a bias power supply 13. The high voltage side of the high voltage coil 12 is connected to the anode 16 of the cathode ray tube 15 via the high voltage rectifier diode 14, and the other end of the coil 12 is connected to A B L (
Automatic Brightness Lis+
i ter) side. The flyback transformer 2 boosts the flyback pulse applied from the horizontal deflection output circuit 1 and applies the boosted output (high output voltage) to the anode 16 of the cathode ray tube 15.

The high voltage stabilizing circuit 54 includes a base f$ voltage generating circuit 3;
A differential amplifier 822 functioning as a comparison section, a switching circuit 23, a multiplier circuit 46, and an addition voltage generation coil 2
Consists of 1. The additional voltage starting coil 21 is wound around the core 10 of the flyback transformer 2 insulated from other coils, and an input tap 19 is provided at the winding start end of the coil 21. An output tap 24 is provided on the output end side (winding end side) of the coil 21. This output tap 24 outputs the added voltage generated in the coil 21.

On the other hand, the high voltage side of the high voltage coil 12 (high voltage rectifier diode 1
One end of a fixed resistor 28 is connected to the cathode side of 4, and a variable resistor VR5 for adjusting the high voltage output voltage is connected in series to constitute a high voltage detection section 9 for the high voltage output voltage Hv.

As this high voltage resistance, a focus resistance or a bleeder resistance may also be used. And variable resistor V
The other end of R is connected to a reference potential (ground side in the figure).

The variable resistor VR detects the high voltage output voltage Hv through its sliding terminal, and applies this detected voltage e6 to the negative input terminal of the differential amplifier 57 constituting a comparison target voltage generation circuit.

The reference voltage generation circuit 3 includes a control voltage generation coil 25,
It consists of a rectifier 26, a rectangular wave output circuit 27, and an integrating circuit 31, and the rectangular wave output circuit 37 consists of an amplifier 32 and a clip circuit 33.

The control voltage generating coil 25 is wound around the core 10 of the flyback transformer 2 on the low voltage side insulated from other coils.
Control voltage et of the flyback pulse waveform shown in Figure (a)
occurs.

The rectifier 26 rectifies the voltage e generated by the control voltage generating coil 25 and transmits only the positive component of the voltage e2 to the amplifier 32.
Input to the inverted input terminal, that is, the negative terminal.

Amplifier 32 amplifies this input voltage and applies its output to clip circuit 33. The clipping circuit 33 cuts off the top of the voltage waveform amplified by the amplifier, as shown in FIG.
), the voltage is a rectangular wave whose pulse width is the retrace period T, (in this specification, rectangular wave is used in a broad sense to include not only rectangular waveforms but also square waveforms). e4 is generated and added to the integrating circuit 31.

This integrating circuit 31 integrates the rectangular wave voltage e4 over the retrace period Tr, and as shown in FIG. 2(C), the starting point of the retrace period is zero and the end point of the same period is Creates an upward-sloping waveform with a peak value. In this case, since integration is not performed in the range exceeding the retrace period T1, the waveform is discharged from the peak position (discharge from the capacitor of the integrating circuit).
As a result, the voltage waveform slopes upward to the right, and a triangular wave voltage es is created which peaks at the end point of the retrace period T1. This triangular voltage waveform maintains a constant shape during any retrace period T1. This triangular wave voltage e,
is applied to the second input terminal of differential amplifier 22.

The deflection current detection section 55 consists of a voltage extraction tap connected to the connection between the horizontal deflection coil 7 and the figure-8 correction capacitor 8. This detection signal is applied to the signal processing circuit 56. Signal processing circuit 56
is a rectifier diode 58, a capacitor 60.61,
It consists of resistors 62 and 63. The rectifier diode 58 performs peak rectification of the detection voltage applied from the deflection current detection section 55. This peak rectified signal is then smoothed by a capacitor 60. This smoothed signal is then transferred to the capacitor 61.
The DC component is cut off, the changing component of the peak rectified waveform of the horizontal deflection voltage is taken out, and this changing component is added to the differential amplifier 57.

This differential amplifier 57 determines the difference between the high voltage detection voltage e6 applied from the high voltage detection section 9 and the change component of the peak rectified voltage on the horizontal deflection coil side applied from the signal processing circuit 56, and further amplifies this difference. A comparison target voltage eC is generated, and the comparison target voltage eC is applied to a first input terminal of a differential amplifier 22 functioning as a comparison section.

The differential amplifier 22 has a triangular wave voltage e, and the differential amplifier 57
Figure 2 (
C)), the triangular wave voltage es is a positive constant voltage only in the section Δt (in the figure, the section from t3 to t and the section from t7 to t9) in which the triangular wave voltage es exceeds the comparison target voltage eC, and the rest is a negative constant voltage including the scanning period. A control signal e7 having a constant voltage level is applied to the switching circuit 23.

The switching circuit 823 includes a drive transistor 34, a diode 35, 36, a resistor 37, 38, a capacitor 40, a drive power source 41, a drive transformer 42 including a secondary coil 44 and a secondary coil 45, and a control circuit. It consists of a transistor 43. This switching circuit 23 opens the gate for a predetermined period when the control signal e is a positive voltage, and supplies the pulse voltage el+1 shown in FIG. 2 (5) to the multiplier circuit 4.
Add to 6.

The multiplier circuit 46 includes first to third diodes 47.
．． 48.49 and each of the first to third capacitors 50°5L
52. In addition, 53 is ABL
This is a diode connected between the side and diodes 47 and 48 of the multiplier circuit 46.

The present embodiment is configured as described above, and the stabilizing effect on the high voltage output voltage Hv will be explained below.

For example, when a video signal as shown in FIG. 3(a) is input, a high voltage output current . flows, and the high-voltage output voltage HV drops due to the internal impedance of the high-voltage generating section, and this is detected by the high-voltage detecting section 9, as shown in FIG. 3 (b). At this time, as described above, the high voltage output voltage 1.
flows, the current on the primary side of the transformer 2 is taken to the secondary side, the current on the negative side decreases, and the horizontal deflection current Iゎ decreases accordingly. This horizontal deflection current IDY is the third
The envelope of the peak part of the waveform of IDY becomes the peak rectified waveform of ID, and this peak rectified waveform decreases in response to the drop in the high voltage output voltage Hv, but when Hv The response speeds of both 1□ are different. On the other hand, the horizontal deflection voltage changes as shown in FIG. 3(d), and the envelope of its peak value, that is, the peak rectified waveform of the horizontal deflection voltage waveform corresponds to the peak rectified waveform of the horizontal deflection current, In this embodiment, the horizontal deflection current IDY is detected by indirectly detecting the horizontal deflection voltage, that is, the voltage of the five-character correction capacitor 8 is indirectly detected as the voltage component of the horizontal deflection current. The fact that the peak rectified voltage of the five-figure correction capacitor 8 corresponds to the peak rectified value of the horizontal deflection current can be explained as follows.

-a, the voltage E is expressed as the inductance multiplied by the differential value of the current I with respect to time t.

E=L (d I/d t) (2) On the other hand, to explain the operating principle of the horizontal deflection output circuit based on FIGS. 4 and 5, first, the horizontal deflection current shown in FIG. In the section from T to T2 of the waveform, the horizontal output transistor 4 is turned on, and current 11. ! z flows, and at the same time energy is stored in the horizontal deflection coil 7 and the low voltage coil 11. Next, in the section from T2 to T4 via T3, the horizontal output transistor 4 is turned off, and at the same time, in the section from T2 to T3, the energy stored in the horizontal deflection coil 7 and the low voltage coil 11 is also the characteristic of the inductance L. The resonant capacitor 6 is charged as a delayed component of the current. When the screen of the cathode ray tube is bright, the current charging the resonant capacitor 6 is taken to the high voltage side (secondary side) and is therefore reduced. At time T, when all the energy of the inductance of the horizontal deflection coil 7 and the low voltage coil 11 is transferred to the resonant capacitor 6, the energy is transferred from the resonant capacitor 6 to the horizontal deflection coil 7 and the low voltage coil 1.
1 in a free vibrational manner. At that time, as mentioned above, when the energy that charged the resonance capacitor 6 decreases,
The energy and current returned to the horizontal deflection coil 7 and low voltage coil 11 is also reduced. This returned current causes the horizontal deflection coil 7 and the low voltage coil 11 to store energy in the opposite direction (opposite polarity) to the initial one.

Next, in the interval from T4 to T, when the retrace period of the flyback pulse ends and negative vibration is about to start, the damper diode 5 is turned on and the reverse polarity stored in the horizontal deflection coil 7 and the low voltage coil 11 is turned on. The energy becomes a back electromotive force and flows through the bias power supply 13 and the three-figure capacitor 8 via the damper diode 5. At this time, since the stored energy is decreasing, the back electromotive force naturally weakens, and the flowing current also decreases, so the charge charging the damper diode 5 also decreases.

Next, in the interval from T5 to T6, the horizontal output transistor 4
is turned on, and current flows through the horizontal output transistor 4 using the decreasing energy of the three-figure capacitor 8 as an energy source, so that the energy stored in the horizontal deflection coil 7 decreases. As is clear from the series of operations from T to T6, in equation (2) above, if E is replaced with the voltage of the three-figure capacitor 8, I with the horizontal deflection current, and t with the scanning period, then ( 2) The formula holds true. At that time, since the inductance is constant, the horizontal deflection current corresponds to the voltage of the figure-8 capacitor, and therefore, the horizontal deflection current can be detected as the voltage of the figure-8 capacitor.

In this embodiment, the horizontal deflection current IDY is as shown in FIG.
As shown in d), it is detected as a voltage signal of the figure-8 correction capacitor 8 by the deflection current detection section 55.

This detection signal is applied to the signal processing circuit 56, and first,
The rectifier diode 58 provides a peak rectified voltage as shown in FIG. 3(e). This peak rectified voltage is obtained by extracting the envelope of the peak value of the voltage waveform in FIG. 3(d). Next, the direct current component of this peak rectified voltage is cut by a capacitor 61, and as shown in FIG. 54 comparison section, that is, the differential amplifier 57.

The differential amplifier 57 determines the difference between the detected voltage e6 detected by the high voltage detection section 9 and the fluctuation component of the peak rectified voltage applied from the differential amplifier 57, amplifies this as a signal, and uses it as a comparison target voltage ec. This is added to the differential amplifier 22.

That is, the differential amplifier 57 feeds back a detection voltage change component equivalent to the horizontal deflection current to the detection voltage detected by the high voltage detection section 9, and negatively corrects the high voltage detection voltage with the change component of the peak rectified voltage. That's what I do. In other words, in Figure 3), near the rise of the video signal, the voltage is in an excessive state in the part A, and the voltage is in an insufficient state in the part B, and the horizontal deflection current IDY is in the vicinity of the rise of the video signal. changes rapidly, and this change causes a change in the horizontal deflection amplitude, causing screen curvature.

In this embodiment, in order to prevent such screen curvature, the comparison target voltage is created so that the change component of the peak rectified voltage shown in FIG. 3(f) does not occur when the correction voltage is added. In other words, in Figure 3), part A is subtracted from the high voltage detection voltage e, so as to reduce the added voltage of the high voltage output voltage, and part B has insufficient voltage, so the added voltage is increased by that amount. This is added to the high voltage detection voltage (subtracting the negative voltage of B) and applied to the comparison section (differential amplifier 22) of the high voltage stabilizing circuit 54.

The differential amplifier 22 compares the triangular wave reference voltage applied from the reference voltage generation circuit 3 with the comparison target voltage ec applied from the differential amplifier 57, and generates a control signal e7 corresponding to the amount of drop of the comparison target voltage with respect to the reference voltage. is added to the switching circuit 23.

Based on this control signal e7, the switching circuit 23 opens the gate in accordance with the amount of drop in the voltage to be compared, that is, in accordance with the pulse width of the control signal e7, and increases the addition voltage generated by the addition voltage generation coil 21. Multiplier circuit 46
It is added as a correction voltage to the low voltage side of the high voltage coil 12 via the voltage converter 12 to stabilize the high voltage output voltage Hv.

As described above, according to this embodiment, the change component of the peak rectified voltage of the voltage of the 5-character correction capacitor detected by the deflection current detection unit 55 is added to the high voltage detection voltage e6 detected by the high voltage detection unit 9 in a negative manner. The change component is subtracted from the high voltage detection voltage e6 to obtain the comparison target voltage e.
This voltage to be compared with the reference voltage ec
Since the voltage corresponding to the amount of drop in is added to the secondary side of the flyback transformer as a correction voltage, the amount of drop in high voltage output voltage caused by the flow of video signals, etc., and the change in the peak rectified waveform of horizontal deflection current can be calculated. A balance is achieved, which eliminates the possibility of changes in the horizontal deflection amplitude when correcting the high output voltage, e.g. as shown in FIG. 6(b).
When the pattern is corrected, as shown in FIG. 6(d), it becomes possible to stabilize the high output voltage without causing screen distortion.

Note that the present invention is not limited to the above-mentioned embodiments, and can take various embodiments. For example, in the above example,
Although the horizontal deflection current is extracted as the voltage of the three-figure capacitor 8, the horizontal deflection current may be directly detected. In this case, for example, a resistor may be connected in series with the horizontal deflection coil 7, such as between the three-figure capacitor 8 and the ground wire, and the voltage across this resistor may be taken out as the horizontal deflection current detection signal. .

In addition, in the above embodiment, the high voltage stabilizing circuit 54 is a pulse width control circuit using the switching circuit 23, but the high voltage stabilizing circuit 54 is corrected based on the comparison value between the comparison target voltage and the reference voltage. Any other circuit configuration may be used as long as the circuit adds voltage to the high voltage side (secondary side) of the flyback transformer 2.

〔Effect of the invention〕

The present invention detects the horizontal deflection current as a voltage component, and negatively feeds back a change component obtained by peak-rectifying the voltage detection signal of the horizontal deflection current to the high-voltage detection voltage detected by the high-voltage detection section to obtain a comparison target voltage. This comparison target voltage is compared with the reference voltage, and a correction voltage corresponding to the amount of drop of the comparison target voltage with respect to the reference voltage is added to the high voltage side of the flyback transformer. It becomes possible to match changes in the high-voltage output voltage and changes in the horizontal deflection amplitude in a well-balanced manner. As a result, by adding the correction voltage to the high voltage side, it is possible to stabilize the horizontal deflection amplitude without causing screen distortion.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the high voltage generating circuit according to the present invention, and FIG. 2 is a time chart showing the operation of the same embodiment.
Fig. 3 is an explanatory diagram of the operation of high voltage stabilization control in the same embodiment, Fig. 4 is a circuit diagram for explaining the resonance operation of the horizontal deflection output circuit, Fig. 5 is a waveform diagram of the horizontal deflection current, and Fig. 6 FIG. 2 is an explanatory diagram showing various patterns on the screen of a cathode ray tube together with signal patterns. DESCRIPTION OF SYMBOLS 1... Horizontal deflection output circuit, 2... Flyback transformer, 3... Reference voltage generation circuit, 4... Horizontal output transistor, 5... Damper diode, 6... Resonant capacitor, 7... ...Horizontal deflection coil, 8...5-character correction capacitor, 9...High voltage detection section, 10...Core, 11...Low voltage coil, 12...High voltage coil, 13
...Bias power supply, 14...High voltage rectifier diode,
15... Cathode ray tube, 16... Anode, 19...
Input tap, 21...Additional voltage generating coil, 22...
- Differential amplifier (comparison section), 23-... switching circuit, 24... output tap, 25... control voltage generation coil, 26... rectifier, 27... square wave output circuit,
28...Fixed resistor, 31...Integrator circuit, 32...
- Amplifier, 33... Clip circuit, 34... Drive transistor, 35. 36-... Diode, 37.
38...Resistor, 40...Capacitor, 41...
Drive power supply, 42... Drive transformer, 43... Control transistor, 44... -Secondary coil, 45... Secondary coil, 46... Multiplier circuit, 47.48.49.
...Diode, 50.51゜52...Capacitor,
54... High voltage stabilization circuit, 55... Deflection current detection unit, 56... Signal processing circuit, 57... Comparison target voltage generation circuit (differential amplifier) 58... Rectifier diode, 60゜61...Capacitor, 62゜63...Resistor.

Claims (1)

[Claims] a horizontal deflection output circuit equipped with a deflection yoke; a flyback transformer that boosts the flyback pulse generated by the horizontal deflection output circuit to apply a high output voltage to the anode of the cathode ray tube; and a high voltage detector that detects the high output voltage. and a comparison section for comparing a comparison target voltage based on the detected voltage of the high voltage detection means with a reference voltage. a high-voltage stabilizing circuit applied to a side); The signal detected by the detection section is peak-rectified, and the voltage corresponding to the change component of the peak rectified voltage is subtracted from the high-voltage detection voltage, and the remaining voltage after this subtraction is used as the voltage to be compared with the comparison section of the high-voltage stabilization circuit. A high voltage generation circuit comprising: a generation circuit for generating a comparison target voltage to be added to the voltage.