KR100239031B1 - Apparatus for initializing device affected by a high voltage discharge on the cathode-ray tube - Google Patents

Abstract

The present invention relates to a device initializing device for the cathode ray tube high-pressure discharge that can normalize the operation state by automatically resetting the device when the operation of the peripheral device is unstable due to the impact of the high-pressure discharge occurs in the cathode ray tube, A main power supply unit 11 for supplying operating power to the overall apparatus, a device 12 operated by receiving power from the main power supply unit 10, and a reset voltage supplied from the main power supply unit 11 to the device 12; The first level is determined when the level of the reset voltage signal is within the range of the reference potential by determining whether the level of the reset voltage signal is within the range of the reference potential based on a predetermined reference potential by receiving the signal RST. A level comparator 16 for outputting a signal, which is driven on / off under a predetermined control to contact the reset stage RST of the voice processing IC 12 during an on time interval. The device reset unit 17 for initializing the audio processing IC 12 by setting the electric potential and the device reset unit 17 are driven when the determination signal of the first level is applied from the level comparator 16. And a controller for controlling the device to be initialized.

Description

Device initializer for high pressure discharge of cathode ray tube

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a television receiver, and more particularly, to a cathode ray tube high pressure discharge, which is capable of normalizing its operating state by automatically resetting the device when the operation of the peripheral device becomes unstable due to the high voltage discharge occurring in the cathode ray tube. A device initializer.

In general, an image output device using a cathode ray tube (CRT) is used by deflecting and accelerating hot electrons generated by electrical heating to deflect the electron beam emitted from the electron gun by using an electron gun that outputs an electron beam and a high voltage. A deflection circuit is provided to allow the emitted electron beam to be scanned on the fluorescent surface of a cathode ray tube (hereinafter referred to as a CRT). FIG. 1 is a representative example of a cathode ray tube having the above-described configuration. A diagram showing a cathode ray tube.

In FIG. 1, reference numeral 1 denotes a flyback transformer (FBT) that applies a high voltage to the anode electrode P to output an electric power required for generation, focusing, and acceleration of an electron beam, and to guide the electron beam to a fluorescent surface. 2 is a heater for converting electrical energy from DC power supplied from a flyback transformer (hereinafter referred to as FBT) 1 to thermal energy, and 3 is a barium oxide (BaO) deposited on a surface thereof. It is a cathode that emits a beam of hot electrons by thermal energy conducted from a heater 2.

In addition, reference numeral 4 is a control grid for controlling the amount of electron beam emitted from the cathode 3 according to the DC voltage supplied from the third terminal (V3) of the FBT (1), 5 is the FBT Focusing grid for focusing the electron beam passing through the control grid 4 in accordance with the voltage supplied from the second terminal (V2) of (1), 6 is based on the ultra-high voltage power supplied through the anode electrode (P) Acceleration grid for gradually accelerating the scanning of the electron beam passing through the focusing grid (5), 7 is a high-resistance power that is supplied through the anode electrode (P) while having a high resistance component by itself acceleration grid (6) It is an ultra high resistor applied to.

That is, in the general CRT having the above-described configuration, the hot electrons emitted from the cathode 3 are primarily focused, accelerated to ultra high voltage over multiple stages, and then the fluorescent surface is applied as a high voltage applied through the anode terminal P. Although not shown, the electron beam induced by the above-described process is deflected in the horizontal and vertical directions according to the deflection signal supplied from the FBT 1 to reproduce the image according to the broadcast reception on the CRT screen. do.

On the other hand, as described above, in the state in which the TV receiver is ON, the high voltage {30 [KV]} of the anode terminal P is supplied to the ultra-high resistor 7 to accelerate the electron beam. It is to be discharged through the discharge loop contracted at the time of OFF. If the distance between the poles exceeds the prescribed range or an abnormality occurs in the discharge passage due to an error in the production process, the ultra-high resistance member 7 The high voltage induced in the air is discharged through the grid (4, 5, 6) stages which are not normally discharged and are close by the rapid potential difference. As a result, the CRT not only shortens the life of the CRT but also generates noise whenever the air discharge occurs. And adversely affect the surrounding devices.

That is, when a high-pressure discharge phenomenon occurs in the cathode ray tube, the electric shock reaches the main power supply part through the FBT (1), so that the voltage supplied from the main power supply becomes unstable and eventually the operating power is supplied from the main power supply part. The problem is that the operation of the peripheral devices supplied falls into an unstable state.

The present invention has been made in view of the above circumstances, and when the operation of the peripheral device becomes unstable due to the high voltage discharge occurring in the cathode ray tube, the cathode ray tube high pressure can be normalized by automatically resetting the relevant device. The object is to provide a device initializer for discharge.

1 is a view showing the internal configuration of a typical cathode ray tube.

Figure 2 is a block diagram showing a device initialization device for the cathode ray tube high-pressure discharge according to an embodiment of the present invention.

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

1: flyback transformer (FBT)

2: heater 3: cathode

4: control grid 5a, 5b: focusing grid

6a: acceleration grid 6b: medium acceleration grid

6c: high acceleration grid 7: ultra-high resistance

10 microprocessor 11 main power supply

12: voice processing IC 13: voice amplifier

14 speaker 15 switching unit

16: level comparator 17: device reset unit

XTAL: Oscillator

The device initializing device for the cathode ray tube high-pressure discharge according to the present invention for realizing the above object is a main power supply unit 11 for supplying the operating power to the overall device, and a device operated by receiving power from the main power supply unit 10 ( 12) receiving a reset voltage signal RST supplied from the main power supply unit 11 to the device 12 and determining whether the level of the reset voltage signal is within a range of the reference potential based on a predetermined reference potential. A level comparator 16 which outputs a determination signal of a first level when the level of the reset voltage signal is within a range of the reference potential, and is driven on / off under a predetermined control and the voice processing IC 12 is operated during an on time period. The device reset unit 17 for initializing the voice processing IC 12 by setting the reset terminal RST of the device to ground potential, and the device signal when the determination signal of the first level is applied from the level comparator 16 It characterized in that it comprises a control unit for controlling to drive the set unit 17 to initialize the device.

That is, according to the present invention having the above-described configuration, it is possible to automatically initialize the device by detecting the unstable operation state of the peripheral devices due to the air discharge phenomenon occurring inside the CRT, so that the overall function of the TV is temporarily unstable. When placed, it can eliminate the possibility of malfunction.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention.

Meanwhile, an embodiment of the present invention will be described by taking an audio processing IC as an example among various devices in a TV.

FIG. 2 is a block diagram showing a device initialization apparatus for a cathode ray tube high pressure discharge according to an embodiment of the present invention, and the same reference numerals are assigned to components that perform substantially the same functions as the configuration shown in FIG. The detailed description is omitted.

In FIG. 2, reference numeral 10 denotes a microprocessor for controlling the operation of the apparatus as a whole, and 11 is a main power supply unit configured as a switching mode power supply (SMPS) to supply operating power to the apparatus.

Further, reference numeral 12 denotes a voice intermediate frequency signal (SIF) demodulated by a tuner (not shown) under the control of the microprocessor 10 through the I ² C bus and outputs the same through the speaker 14. The audio processing IC 12 outputs an audio signal. The audio processing IC 12 is operated based on a frequency signal of 18.432 MHz generated and output from the oscillator XTAL.

Further, reference numeral 13 receives a signal output from the output terminals SPK.L and SPK.R of the voice processing IC 12 and amplifies it to a predetermined level so as to audible audio through the rear speaker 14. The audio amplifier outputs.

On the other hand, the reference numeral 16 receives a reset voltage signal supplied from the main power supply unit 11 to the voice processing IC 12, and the level of the reset voltage signal is in the range of the reference potential based on a predetermined reference potential. Is a level comparator for determining whether or not the level comparator is, and 15 denotes a level comparator for a reset voltage signal supplied from the main power supply unit 11 to the audio processing IC 12 according to a predetermined control signal from the microprocessor 10. The switching unit 17 for selectively switching to 16 is driven on / off under the control of the microprocessor 17 to set the reset stage RST of the voice processing IC 12 to ground potential during the on time period. A device reset unit for initializing the audio processing IC 12.

Next, the operation of the device having the above configuration will be described.

When the user turns on the power of the TV through a remote control device or the like, the microprocessor 10 passes between the two contacts T1 and T2 of the switching unit 15 after a predetermined time has elapsed from the TV on driving time. By short-circuit it is prepared for the high-pressure discharge of the cathode ray tube. On the other hand, the detection of the reset (RST) voltage at the same time as the TV ON time is to exclude the possibility of malfunction during the reset voltage reaches the normal level at the on / off time.

When the high-pressure discharge phenomenon occurs in the cathode ray tube by driving control of the switching unit 15, the operating power supplied to the entire apparatus from the main power supply unit 11 composed of the SMPS becomes unstable, and as a result S2 The potential level of the reset voltage signal applied to the audio processing IC 12 through the terminal is swinged in the range of 2 to 4 [V] away from the normal level of DC 5 [V].

As a result, the voice processing IC 12 shows an unstable operation state, and sometimes the audio output is muted or noise is generated.

At this time, the level comparator 16 receives the reset voltage applied through the switching unit 15 and compares it with the first and second reference voltages DC 2V and DC 4V. When the RST falls within the potential between the first reference voltage and the second reference voltage, that is, in the range of DC 2 to 4 [V], the microprocessor 10 outputs a determination signal of, for example, a high level.

On the other hand, when the high level determination signal is applied from the level comparator 16, the microprocessor 10 outputs the high level reset control signal to the device reset unit 17 for, for example, about 1 second. As a result, while the transistor Q in the device reset unit 17 is driven ON, the reset terminal RST of the voice processing IC 12 is temporarily set to the ground potential.

In the state where the reset stage RST of the audio processing IC 12 has been maintained at the ground level for a predetermined time, the transistor Q in the device reset unit 17 is subsequently controlled under the control of the microprocessor 10. When it is returned to the off state, the voice processing IC 12 initializes its operating state according to the level change of the reset stage RST. As a result, the voice processing IC 12 is released from the unstable state.

That is, according to the above embodiment, when the operation of the peripheral device becomes unstable due to the influence of the high voltage discharge occurring in the cathode ray tube, the device initialization device for the cathode ray tube high pressure discharge is able to normalize its operation state by automatically resetting the corresponding device. Can be realized.

Meanwhile, the present invention is not limited to the above embodiments and can be variously modified within the scope not departing from the technical gist of the present invention.

As described above, according to the present invention, by detecting the unstable operation state of the peripheral devices due to the air discharge occurring inside the CRT, the device can be initialized automatically so that the overall function of the TV is temporarily in an unstable state. It can eliminate the possibility of causing.

Claims (1)

A main power supply unit 11 for supplying operation power to the overall apparatus; The device 12 operated by receiving power from the main power supply unit 10, The reset voltage signal RST supplied from the main power supply unit 11 to the device 12 is applied to determine whether the level of the reset voltage signal is within a range of the reference potential based on a predetermined reference potential. A level comparator 16 for outputting a determination signal of the first level when the level of the voltage signal is within the range of the reference potential; A device reset section 17 for initializing the audio processing IC 12 by setting the reset stage RST of the audio processing IC 12 to the ground potential during the on-time period driven on / off under a predetermined control; And And a control unit which controls the device reset unit 17 to be initialized when the determination signal of the first level is applied from the level comparator 16. Device initiator.

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