KR100220347B1 - Power input device of deflection ic - Google Patents

Abstract

The present invention relates to a power input device for a deflection IC capable of minimizing heating loss of a deflection IC by variably applying a power source voltage required for a retrace period and a power source voltage required for a scan period in a television receiver, A flyback transformer for generating or outputting a first or a second level voltage, a retrace pulse generator for generating and outputting a retrace pulse in a vertical retrace period, And a voltage variable output unit for outputting the first level voltage to the deflection control unit while a low level return pulse is input from the deflection control unit, and the deflection control unit is configured to output the output signal of the second level voltage or the variable voltage output unit And the electron beam is deflected and controlled based on the result.

Description

Power input device of deflection IC

The present invention relates to a television receiver, and more particularly, to a power supply input device for a deflection IC that is adapted to variably apply a power supply voltage required for a retrace period and a power supply voltage required for a scanning period.

Currently, in order to display images on the fluorescent screen of the CRT in a television receiver that is generally distributed in each home, a very powerful electron beam is scanned on the fluorescent screen. In order to uniformly scan the electron beam to the corner portion of the fluorescent surface, the electron beam to be scanned is deflected in the vertical and horizontal directions by a predetermined deflecting device.

FIG. 1 is a functional block diagram schematically showing a configuration of a television receiver provided with a deflection IC for deflecting an electron beam as described above.

Reference numeral 2 denotes a tuner for tuning a broadcast signal input from the antenna 1 according to a control signal of a processor 8 to be described later, reference numeral 3 denotes an antenna for receiving a broadcast signal input from the antenna 1, And is an IF amplifying unit for amplifying the IF signal inputted and selected from the tuner 2.

Reference numeral 4 denotes a P / S separation (for example, a surface acoustic wave filter or the like) for separating and outputting the IF signal from the IF signal input from the IF amplifier 3 into the video intermediate frequency signal PIF and the audio intermediate frequency signal SIF And 5 is a video detector for detecting a video signal from a PIF signal input from the P / S separator 3. [

Reference numeral 6 denotes an image processing unit for performing a predetermined image processing operation on the composite video signal input from the video detector 5, and the video processor 6 outputs the composite video signal, which is output from the video detector 5, (RED), G (R), and G (R) corresponding to a video signal by processing a color, a tint, and a brightness according to a control signal from a processor 8 G and B and a luminance signal (-Y) inputted from the image processing unit 6, and outputs 7 (R, G, B) And a CRT driving unit for driving the CRT.

Reference numeral 8 denotes a processor as a control unit for performing overall operation control of the television receiver. Numeral 9 denotes a processor for controlling the vertical and horizontal deflection controllers 9 and 10, And a deflection data storage unit for storing the deflection control data.

Reference numeral 10 denotes a deflection control unit for driving and controlling the vertical and horizontal deflection coils VC and HC provided in the CRT as shown in FIG. 1. The deflection control unit 10 includes a main power source unit A vertical and horizontal deflection coil (not shown) is driven in accordance with a control signal of the processor 8 based on a voltage input from a flyback transformer (FBT) for generating a voltage for driving an arbitrary device based on an applied voltage VC, HC).

In addition, reference symbol VC denotes a vertical deflection coil, HC denotes a horizontal deflection coil, and they denote deflection of the electron beam emitted from the electron gun (not shown) of the CRT from the deflection control unit 10 The image is reproduced on the fluorescent screen of the CRT by deflecting in the up, down, left, and right directions according to the signal.

Next, the operation of the apparatus having the above-described configuration will be described with reference to FIG.

That is, in the above-described television receiver, if the receiver selects an arbitrary channel by using an input means such as a remote controller not shown, the processor 8 performs tuning control of the tuner 2 based on the predetermined channel data The channel selection is executed.

Then, the selected broadcast signal is separated into a voice signal and a video signal. At this time, the audio signal is subjected to predetermined audio processing through a sound processing unit (not shown), and then output to a speaker. The video signal is subjected to predetermined image processing through the image processing unit 6 to generate R, G, -Y signal and outputs it to the CRT driver 7. The CRT driving unit 7 drives the CRT based on the chromaticity signal and the luminance signal to scan the fluorescent screen with a predetermined electron beam for the image.

At this time, the processor 8 controls the deflection control unit 10 to deflect the electron beam scanned on the fluorescent screen. The deflection control unit 10 is based on a control signal applied from the processor 8 By interrupting the input power inputted from the flyback transformer (FBT), the vertical and horizontal deflection coils of the subsequent stage are controlled to deflect the electron beam.

On the other hand, the deflection current required for deflecting the electron beam scanned on the fluorescent surface is different between the retrace period and the scan time. That is, as shown in (a) of FIG. 2, the deflection current required for the retrace period increases exponentially in the retrace period, and based on the deflection data of the deflection data storage unit 9, It is seen that it is a function that decreases with a difference in function.

Thus, in general, the deflection control unit 10 for applying the above-described deflection current receives a voltage of 25 V from a flyback transformer (FBT) (not shown) and, based on this input voltage, The input voltage of 25 V is used as it is to supply the deflection current of the above-mentioned first-order functional scanning period between the syringes. In the retrace period in which a relatively high voltage is required, a voltage boosted to 50 V through a voltage raising circuit (PUMP-UP) .

Next, the vertical retrace time and the vertical synchronizing signal waveform according to the scanning period are shown in FIG. 2 (c). The high-level signal portion is the scanning period, and the low-level signal portion is the retrace period.

When the voltage for supplying the deflection current shown in FIG. 2 (a) is analyzed, as shown in FIG. 2 (d), a voltage of 50 V is required in the retrace period. However, even if a voltage lower than 25 V is supplied between the injectors It is found that there is no problem in properly deflecting the electron beam.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a deflection IC capable of suppressing heat generation loss of a deflection IC by variably applying a power supply voltage required for a retrace period and a power supply voltage required for a scanning period, And a power input device of the present invention.

FIG. 1 is a functional block diagram for explaining a deflection operation in a general television receiver; FIG.

FIG. 2 is a view for explaining an input power supply in the retrace or scanning period of FIG. 1; FIG.

FIG. 3 is a functional block diagram showing a configuration of a power input device of a deflection IC according to a first embodiment of the present invention; FIG.

FIG. 4 is a reference drawing for explaining the operation of the apparatus of FIG. 3; FIG.

FIG. 5 is a functional block diagram showing a configuration of a power input device of a deflection IC according to a second embodiment of the present invention; FIG.

FIG. 6 is a view for explaining the operation of the apparatus having the configuration of FIG. 5; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

1: Antenna 2: Tuner

3: IF amplification unit 4: P / S separation unit

5: Image Detection Unit 6: Image Processing Unit

7: CRT driver 8: processor

9: deflection data storage unit 10: deflection control unit

20, 30: Power input device

FBT (FLYBACK TRANSFORMER): Flyback transformer

VC: Vertical deflection IC HC: Horizontal deflection IC

CRT: CATHODE-RAY TUBE

SIF (SOUND INTERMIDIATE FREQUENCY): A voice intermediate frequency signal

PIF (PICTURE INTERMIDIATE FREQUENCY): Video intermediate frequency signal

In order to achieve the above object, a power input device for a deflection IC according to the present invention includes a deflection control unit for deflecting an electron beam in a vertical or horizontal direction, a flyback transformer for generating or outputting a first or second level voltage, And a voltage variable output section for outputting the first level voltage to the deflection control section while the retrace pulse of the first level is inputted from the retrace pulse generation section, And the deflection control unit deflects and controls the electron beam based on the output signal of the second level voltage or voltage variable output unit.

The voltage variable output unit may interrupt the first level voltage output when a retrace pulse of a second level is input from the retrace pulse generation means.

That is, according to the above description, the voltage required for the scanning period or the vertical retrace period is variably supplied, thereby reducing the heat generation loss of the deflection IC.

3 shows a power input device for a deflection IC according to a first embodiment of the present invention. In FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals, and a detailed description thereof will be omitted.

In the figure, reference numeral 20 is a circuit diagram showing a power input device of a deflection IC according to the present invention. This circuit includes a vertical and horizontal deflection coil VC (not shown) , HC) to be deflected.

The power input device 20 is composed of two transistors T1 and T2 and two resistors. One of the two transistors T1 and T2 applies a vertical retrace pulse to the base terminal BASE through the resistor R1 and the collector terminal COLLECTER controls the operation of the other transistor T1 The 36V voltage applied from the flyback transformer FBT is coupled to the base terminal BASE of the other transistor T1 through the resistor R2. The other transistor T1 is coupled to the 36V voltage applied from the flyback transformer FBT to the collector terminal COLLECTER and coupled to the deflection control section 10 via the emitter terminal EMITTER of the transistor T1 .

Next, a power input device having the above-described configuration will be described.

As shown in the figure, the voltage applied to the deflection control unit 10 is made via separate input terminals V _CC1 and V _CC2 . One input terminal V _CC2 is applied at 14 V as shown in FIG. 4 (b), and the other terminal V _CC1 is applied at the vertical retrace period shown in FIG. 2 (c) And the voltage of 36V applied from the flyback transformer (FBT) is selectively applied to the deflection control unit 10 based on the retrace pulse.

The two resistors R1 and R2 are provided for limiting the voltage applied to the transistors T1 and T2 and one of the two transistors T1 and T2 is connected to the other one of the transistors T1 and T2. T2 are determined to be conductive or not. At this time, the transistor T2 is turned off when a low level vertical retrace pulse is inputted from a retrace IC (not shown).

That is, when the low-level retrace pulse is inputted in the vertical retrace period and the transistor T2 is turned off, the other transistor T1 is coupled through the resistor R2 with 36V applied from the flyback transformer FBT So that the deflection controller 10 applies a voltage of 36 V to the input terminal V _CC1 as shown in FIG. 4 (c).

Further, a high-level signal is inputted to the base terminal of the transistor T2 between the syringes, and the transistor T2 is turned on so that the 36V voltage applied from the flyback transformer FBT is discharged to the ground. As a result, between the syringes, a voltage of 36 V applied from the flyback transformer FBT to the input terminal V _CC1 of the deflection control unit 10 is cut off. Thus, the voltage applied to the deflection control unit 10 is only 14V of the other input terminal V _CC2 .

As a result, as shown in FIG. 4 (d), the voltage applied to the deflection control unit 10 applies a voltage of 14 V through the input terminal V _CC2 between the syringes. In the retrace period, the above- (V _CC2 ), and a voltage of 36 V is applied through another input terminal (V _CC1 ) to apply a voltage of 50 V as a whole.

Thus, it is possible to reduce the heat generation loss of the deflection IC by reducing the power consumption in generating the above-described deflection control current with reference to FIG. 2 (a).

FIG. 5 is a diagram showing a configuration of a power input device for a deflection IC according to a second embodiment of the present invention. In FIG. 5, the same reference numerals as in FIG. 1 or FIG. 3 are assigned the same reference numerals, do.

Referring to FIG. 5, reference numeral 30 denotes a deflection control unit (not shown) based on a retrace pulse as shown in FIG. 6 (a) applied in a vertical retrace period by applying a single voltage of 25 V from a flyback transformer 10 to output a voltage of a predetermined level.

In the figure, reference numerals D1 to D4 denote diodes for preventing reverse current flow, reference numerals R11 to R17 denote resistors, and reference numerals Q1 to Q4 denote transistors.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

First, a signal as shown in Fig. 6 (a) is applied to the base terminal of the transistor Q4 through the resistor R16 of the present input device between the vertical retrace period or the syringe. In addition, the flyback transformer generates and supplies a voltage of 25V.

When the retrace pulse is applied, that is, when the retrace pulse for the retrace period supplied from the retrace IC is directed downward and the transistor Q4 is turned off, a 25V charge applied from the flyback transformer passes through the transistor Q3 And then stored in the capacitor C2. The accumulation operation of the capacitor C2 is sustained while the low-level retrace pulse is applied.

On the other hand, the retrace pulse is applied to the base terminal of the transistor Q2 through the resistor R13. At this time, since the capacitor C1 accumulates a predetermined level of voltage during the scan period, the retrace pulse is applied and instantaneously discharged through the diode D3 and the resistor R12.

Then, as described above, the capacitor C1 is discharged and the transistor Q2 is turned off. When the transistor Q2 is turned off, the transistor Q2 is turned on with the other transistor Q1 coupled to the collector terminal and the base terminal, so that a voltage of 25V applied from the flyback transformer is supplied to the deflection controller 10 ).

As described above, when the retrace pulse is applied, a voltage of 50V is applied to the deflection control unit 10, and the retrace pulse continues to be instructed to rise. FIG. 6 (b) shows the voltage waveform applied to the deflection control unit 10 in comparison with FIG. 6 (a).

Then, the transistor Q4 is turned on when the retrace pulse is instructed to rise. Then, the voltage of 25V applied from the flyback transformer is passed through the resistor R15 to the ground terminal. Also, the capacitor C1 performs the accumulation operation.

At this time, the capacitor C2 discharges the charge accumulated during the retrace pulse period through the diode D4. As a result, the discharge voltage is applied to the deflection control unit 10 to exhibit a linear function waveform as shown in FIG. 6 (b).

According to the apparatus having the above-described configuration, as shown in FIG. 6 (c), it is possible to generate a deflection control current that exponentially increases in the vertical retrace period and linearly decreases between the injectors.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the technical scope of the present invention.

As described above, according to the present invention, it is possible to reduce the heat generation loss of the deflection IC when the deflection control current is generated by variably applying the voltages required for the retrace period and the scanning period to the deflection control unit, Can be realized.

Claims (2)

A flyback transformer for generating or outputting a first or a second level voltage, a retrace pulse generator for generating and outputting a retrace pulse in a vertical retrace period, And a voltage variable output unit for outputting the first level voltage to the deflection control unit while the first level retrace pulse is input, wherein the deflection control unit controls the second level voltage or the output signal of the voltage variable output unit And the electron beam is deflected and controlled based on the detected deflection angle. The power input device of a deflection IC according to claim 1, wherein said voltage variable output unit cuts off said first level voltage output when a retrace pulse of a second level is input from retrace pulse generation means.