KR100201915B1 - High voltage discharge circuit - Google Patents

Abstract

The present invention relates to a television receiver having a flyback transformer for boosting a pulse voltage generated as the power supplied to the horizontal deflection coil at the flyback time point is increased using a high frequency transformer and used as a horizontal deflection output of the television receiver. In particular, the voltage rectifying means for receiving the voltage applied to one end of the horizontal deflection coil and shunts and outputs, the voltage dividing means for dividing the voltage output from the voltage current means in multiple stages, and the voltage dividing means A voltage magnitude maintaining means for maintaining a predetermined threshold value of the divided voltage, and a switching means for turning on / off according to a specific control signal and outputting a voltage held by the voltage magnitude maintaining means during a turn-on operation. By specifying the high voltage on the water pipe anode It relates to a rapid high-voltage discharge circuit characterized in that the discharge in accordance with the control signal.

Description

Rapid high voltage discharge circuit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and in particular, it does not use the function of a flyback transformer used as a high voltage source of a conventional water tube anode. It relates to a rapid high-voltage discharge circuit for quickly discharging it when the power is cut off.

In general, a television receiver (TV) has a function of selecting and processing a television signal transmitted from a broadcasting station, and referring to FIG. 1 attached to a schematic configuration of a television receiver generally used in the prior art, it is transmitted from a broadcasting station. Tuner unit 110 for receiving broadcast signals of multiple channels through an antenna ANT and tuning to a specific channel, and the operation of the entire system such as a frequency band for each channel tuned by the tuner unit 110 A memory unit 120 storing information, a key input unit 122 for receiving a control signal for an operation of the system from the outside by a user, and the memory unit (according to an input signal of the key input unit 122). The microcomputer 130 for reading the information stored in the 120 and controlling the system, the external AV device 140 for inputting video and audio signals from the outside, and the tuner. A switching unit 150 for selectively outputting an output signal of 110 or an input signal of an external AV device 140, and an image processor 160 for processing an image signal of a broadcast signal passing through the switching unit 150; ), An image amplifier 162 for amplifying the image signal output from the image processor 160 to a predetermined level, and a CRT 164 for receiving an image signal output from the image amplifier 162 and displaying it on the screen. And a vertical / horizontal synchronization processor 166 for outputting a deflection signal DY for deflecting the vertical synchronization signal and the horizontal synchronization signal of the video signal displayed on the screen of the CRT 164, and the switching unit 150. A voice processor 170 for processing a voice signal of the broadcast signal passing through the voice signal, a voice amplifier 172 for amplifying the voice signal processed by the voice processor 170 to a predetermined level, and the voice amplifier 172. Receives a voice signal output from the external When the output speaker 174 and a power cord are inserted into an outlet (not shown), a standby power source (for example, 5V) is applied to the microcomputer 130 and the main power source AC110 is operated according to the operation of the key input unit 122. / 220V) and the FBT (Flyback Transformer) 182 that generates a high voltage pulse to the main power supplied from the power supply unit 180 to supply B ⁺ power to the image processor 160. It is composed.

The function of the FBT 182 in the above-described configuration will be described in more detail. The time for returning to the next dice in accordance with the horizontal synchronization of television scanning is called flyback. In this case, the power required is called a flyback high voltage power supply. . Therefore, a transformer for generating a flyback high voltage power is called a flyback transformer (FBT).

Therefore, referring to FIG. 2 attached to the configuration of the conventional FBT, the power supply ACV supplied to the horizontal deflection coil DY is changed at the flyback time, that is, the pulse voltage is converted using the high frequency transformer TL. After the step-up, the high-voltage rectifier 10 is used to convert the voltage to about 25 kV to 30 kV and use it as a horizontal deflection output of the television receiver. In addition, a relatively low voltage is induced through a portion of the high frequency transformer TL to obtain a voltage of 400 V to 600 V using the rectifier 20 to be used as a high voltage source of the anode of the water pipe.

However, if the power supply is cut off due to a sudden power off or power outage during the normal operation of displaying the received broadcast signal on the screen, the power supply to the horizontal deflection coil DY is cut off. In this case, the high frequency transformer TL acts as if it is a voltage change caused by a flyback time.

Therefore, a high voltage output through the rectifier 20 is applied to the water pipe anode so that a portion of the screen is exposed for a predetermined time (for example, 2 to 3 seconds), that is, during a time when the high voltage applied to the water pipe anode is naturally discharged. Afterimages occur after concentration.

However, this phenomenon is increased as the use of the product increases, causing a problem of shortening the life of the product.

An object of the present invention for solving the above problems is to supply the required power directly from the horizontal deflection coil without using the function of the flyback transformer used as a high voltage source of the conventional water tube anode to obtain a high voltage across the anode of the water tube. The present invention provides a rapid high-voltage discharge circuit for fast discharging when the driving power is cut off.

1 is a block diagram illustrating a general television receiver.

2 is a configuration example of a conventional flyback transformer

Figure 3 is an exemplary configuration for rapid high pressure discharge according to the present invention

* Description of the symbols for the main parts of the drawings *

110: tuner 120: memory unit

122: key input unit 130: microcomputer

140: external AV device 150: switching unit

160: Video Processor 162: Image Amplifier

164: CRT (Cathode-Ray Tube) 166: Vertical / Horizontal Sync Processing Unit

170: Sound Processor 172: Voice Amplifier

174: speaker 180: power supply

182: FBT (Flyback Transformer)

A feature of the present invention for achieving the above object is to use a high frequency transformer to boost the pulse voltage generated as the power supplied to the horizontal deflection coil at the flyback time point again used as a horizontal deflection output of the television receiver. A television receiver having a flyback transformer comprising: a voltage rectifying means for receiving a voltage applied to one end of the horizontal deflection coil and switching the voltage; and a voltage dividing means for dividing the voltage output from the voltage current means in multiple stages. And a voltage size maintaining means for maintaining a predetermined threshold value of the voltage divided by the voltage dividing means, and a turn-on / off operation according to a specific control signal, and maintained by the voltage-size maintaining means during a turn-on operation. By including switching means for outputting a voltage to be supplied It is to discharge the high voltage applied to the specific control signal.

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

3 is an exemplary view of the configuration of a rapid high voltage discharge circuit according to the present invention.

Referring to the configuration shown in Figure 3, the power supply (ACV) supplied to the horizontal deflection coil (DY) fluctuates at the flyback time, that is, the high-voltage rectifier after boosting the pulse voltage using the high frequency transformer (TL) ( 10) is converted to a voltage of about 25 kV to 30 kV and used again as a horizontal deflection output of the television receiver.

In the present invention, additionally, a diode (D) having an anode connected to one end of the horizontal deflection coil (DY), a first capacitor (C1) connected between the cathode of the diode (D) and ground, and A first resistor R1 having one end connected to the cathode of the diode D, a second resistor R2 connected between the other end of the first resistor R1 and ground, and the first resistor R1. A variable resistor (VR) having one end connected to a connection point of the second resistor (R2), a third resistor (R3) connected between the other end of the variable resistor (VR) and ground, and the first resistor (R1). ) And a second capacitor C2 connected between a cathode of the zener diode ZD and a ground of a zener diode ZD having a cathode connected to the ground and an anode connected to ground. And turn on / off according to a control signal and transfer the voltage stored in the second capacitor C2 to the outside during the turn on operation. It is comprised by the switch 30 which outputs.

At this time, the magnitude of the voltage divided by one side of the variable resistor (VR) in the configuration is improved by the portion used as a high voltage source of the anode of the water tube by obtaining a voltage of 400V to 600V by using the rectifier 20 in the prior art to be.

In addition, the characteristics of the signal for controlling the switch 30 is generated when the driving power is supplied, the voltage output through the switch 30 is a voltage for quickly discharging the high voltage on the anode of the water pipe Used.

In addition, the diode (D) and the first capacitor (C1) of the configuration is used as a rectifying means, the first to third resistors (R1 to R3) and the variable resistor (VR) divided the rectified voltage to maintain the voltage difference The second capacitor C2 and the zener diode ZD are configured to maintain the voltage divided by the first resistor R1 and the second resistor R2 within a predetermined threshold. It was used as a means for maintaining the voltage magnitude.

Referring to the preferred operation of the rapid high-voltage discharge circuit according to the present invention configured as described above are as follows.

In the full-phase operation state, the high-voltage rectifier 10 is used after boosting the pulse voltage generated by the high frequency transformer TL as the power supply ACV supplied to the horizontal deflection coil DY changes at the flyback time point. The voltage is converted into a voltage of about 25 kV to 30 kV and used as a horizontal deflection output of the television receiver. In this case, the diode D and the diode D having an anode connected to one end of the horizontal deflection coil DY are used. The voltage charged in the first capacitor C1 by the first capacitor C1 connected between the cathode and the ground of the c) is significantly rectified compared to the voltage applied to the horizontal deflection coil DY.

The power rectified through the diode D and the first capacitor C1 is divided through the first resistor R1 and the second resistor R2 connected in series, and then the variable resistor VR and the third resistor are divided. The voltage is divided again by the resistor R3.

Therefore, the voltage divided by one side of the variable resistor VR has a significantly smaller voltage than the voltage divided by the first resistor R1 and the second resistor R2. At this time, the voltage divided by one side of the variable resistor VR obtains a voltage of approximately 400V to 600V and is used as a high voltage source of the anode of the water pipe.

In this case, the second capacitor C2 and the zener diode ZD allow the voltage divided by the first resistor R1 and the second resistor R2 to be maintained within a predetermined threshold range.

If the user turns off the power or the power supply is interrupted while the above-described process is being performed, the switch 30 is turned on, and accordingly, a predetermined amount stored in the second capacitor C2 is turned on. Is discharged through the switch 30, so that the voltage of the anode discharge voltage is provided to the screen side.

When providing a rapid high-voltage discharge circuit according to the present invention that operates as described above, the light is concentrated on a portion of the screen during the time when the high voltage applied to the anode of the water tube is naturally discharged to reduce the life of the product due to the phenomenon that the afterimage remains The problem can be solved.

Claims (1)

In a television receiver having a flyback transformer for boosting the pulse voltage generated as the power supplied to the horizontal deflection coil at the flyback time point is increased using a high frequency transformer and used as a horizontal deflection output of the television receiver. Voltage rectifying means for receiving a voltage applied to one end of the horizontal deflection coil and outputting a current; Voltage dividing means (R1, R2, VR, R3) for dividing the voltage output from the voltage current means in multiple stages; Voltage magnitude maintaining means (C2, ZD) for maintaining a predetermined threshold value of the voltage divided primarily by the voltage dividing means; And And a switching means 30 for turning on / off according to a specific control signal and outputting a voltage held by the voltage magnitude maintaining means during a turn-on operation. Rapid high-pressure discharge circuit, characterized in that the discharge.

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