KR20000007286U - Voltage rise display circuit of monitor - Google Patents

Abstract

The present invention relates to a voltage rising display circuit of the monitor, the apparatus of the present invention includes an overvoltage detection unit 110 for outputting an overvoltage detection signal when the main voltage supplied to the monitor circuit is higher than the rated voltage; A microcomputer 120 outputting a control signal when the overvoltage detection signal is input; A voice IC 130 for storing various voice information and outputting the voice information according to the control signal; And a speaker 140 that converts and outputs voice information input from the voice IC 130 to an audible frequency, and detects main voltages of a monitor, such as high voltage, and transmits information about a voltage raised above a rating to the speaker. The effect is that the user is informed of the current status by printing or printing on the screen of the receiving hall.

Description

A circuit for displaying of a voltage's ascent in a monitor

The present invention relates to a voltage rising display circuit of a monitor, and more particularly, to a voltage rising display circuit of a monitor which is configured to detect when a main voltage such as a high voltage rises above a rating and to display it step by step according to the rising degree.

In general, the CRT focuses and accelerates hot electrons emitted from R, G, and B electron guns, and then collides with R, G, and B fluorescent surfaces through a point on a shadow mask to form pixels. Sawtooth current flows to form a two-dimensional screen. In order to operate the water tube (CRT), a heater voltage of about 6.3V is applied to the heater, and a focus grid voltage, a screen grid voltage, etc. are required for focusing the emitted hot electrons, and the anode is about to accelerate the hot electrons. High voltage (HV) of about 25KV is applied.

By the way, when the high voltage (HV) applied to the anode in the receiving tube is normal, the electrons collide with the fluorescent surface to emit light in the visible region, but when the abnormally high high voltage (HV) is applied to the anode, the electrons The harder impact on the fluorescent surface may generate an X-ray having a shorter wavelength than visible light.

Most human monitors monitor high voltage (HV) applied to the anode when humans are exposed to such X-rays. When this high voltage (HV) becomes abnormally high, the drive of the horizontal drive signal is stopped and high voltage is detected. An X-ray protection circuit is provided to prevent generation of HV.

FIG. 1 is a circuit diagram illustrating an X-ray protection circuit of a general monitor, which monitors a high voltage (HV) induced in a secondary winding of a flyback transformer (3), and when a high voltage (HV) becomes abnormally high, a horizontal oscillation integrated circuit ( The high level signal is applied to the X.RAY terminal of 4) to prevent the generation of the horizontal drive signal (H.drive).

Referring to FIG. 1, the voltage induced in the cubic coil of the flyback transformer 3 is rectified in the diode D1 and smoothed in the capacitor C1, and then divided resistors R1 and R2 are obtained. It is applied to the cathode side of the zener diode (ZD1) through, and the anode side of the zener diode (ZD1) is connected to the X-RAY protective terminal of the oscillator (4). At this time, when the high voltage H.V output from the flyback transformer 3 is normal, a low voltage (ie, a zener voltage or less) is applied to the zener diode ZD1 to maintain the zener diode ZD1 in an off state.

On the other hand, when the high voltage (H.V) is induced in the secondary winding of the flyback transformer (3) applied to the anode of the CRT rises, the voltage induced in the third winding of the flyback transformer (3) also increases accordingly. When the tertiary side voltage increases, the voltage applied to the cathode of the zener diode ZD1 also increases. The high level signal is applied to the .RAY protection terminal.

When the high level signal is applied through the X-RAY protection terminal, the oscillator 4 blocks the horizontal drive signal (H.drive) oscillated from the internal oscillation circuit so that the horizontal output transistor is maintained in a turn-off state. If the horizontal output transistor is continuously turned off, the voltage is not induced in the secondary winding of the flyback transformer 3 so that the high voltage HV is not generated. Therefore, the high voltage HV rises and the CRT is X-rayed. ) Can be prevented.

However, the X-ray protection circuit 7 operates when the high voltage HV output from the flyback transformer 3 rises to 4 to 5 KV or more above the normal size, and when the high voltage HV rises to within 4 to 5 KV. Since it is not possible to detect this, there is a problem in that the water pipe is damaged due to the elevated high voltage (HV) and the life is shortened.

Therefore, the present invention has been devised to solve the problems of the prior art as described above, and detects the main voltages of the monitor, such as high voltage, and outputs information about the voltage raised above the rating to the speaker or on the water pipe screen The purpose of the present invention is to provide a voltage rising display circuit of a monitor, which is intended to inform the user by the output.

In order to achieve the above object, the voltage increase display circuit of the monitor according to the present invention,

An overvoltage detector for outputting an overvoltage detection signal when the main voltage supplied to the monitor circuit is equal to or higher than the rated voltage;

A microcomputer that outputs a control signal when the overvoltage detection signal is input;

A voice IC which stores various voice information and outputs the voice information according to the control signal; And

And a speaker for converting and outputting voice information input from the voice IC into an audible frequency.

1 is a circuit diagram illustrating an X-ray protection circuit of a general monitor;

2 is a circuit diagram showing a first embodiment of the voltage rising display circuit of the monitor according to the present invention;

3 is a circuit diagram showing a second embodiment of the voltage rising display circuit of the monitor according to the present invention;

4 is a circuit diagram showing a third embodiment of the voltage rising display circuit of the monitor according to the present invention.

* Explanation of symbols for the main parts of the drawings

110,210,310: overvoltage detector 120,220: micom

130: voice IC 140: speaker

230: OSD IC 240: Water tube

320: light emitting diode OP 1,2,3: first 1,2,3 comparator

R 1,2,3,4,5,6; Voltage divider R 7,8.9: current supply resistance

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

2 is a circuit diagram showing a first embodiment of the voltage rising display circuit of the monitor according to the present invention.

As shown in FIG. 2, the apparatus of the present invention includes an overvoltage detecting unit 110 for outputting an overvoltage detecting signal when a main voltage supplied to a monitor circuit is equal to or higher than a rated voltage; A microcomputer 120 outputting a control signal when the overvoltage detection signal is input; A voice IC 130 for storing various voice information and outputting the voice information according to the control signal; And a speaker 140 that converts the voice information input from the voice IC 130 into an audible frequency signal, and amplifies and outputs the predetermined voice signal.

3 is a circuit diagram showing a second embodiment of the voltage rising display circuit of the monitor according to the present invention.

As shown in FIG. 3, the apparatus of the present invention includes an overvoltage detector 210 that outputs an overvoltage detection signal when a main voltage supplied to a monitor circuit is equal to or higher than a rated voltage; A microcomputer 220 for outputting a control signal when the overvoltage detection signal is input; OSD IC 230 which stores various character information and outputs the corresponding character information by the control signal; And a video output circuit 240 for amplifying the text information input from the OSD IC 230 and displaying the text information on the screen of the receiving tube 250.

Here, the overvoltage detectors 110 and 210 may include first voltage divider resistors R1 and R2 for dividing the high voltage HV supplied to the anode of the water pipe; The positive input terminal receives the high voltage HV divided by the first voltage divider resistors R1 and R2 and the negative input terminal receives the reference voltage ( V _ref A first comparator (OP1) receiving 1) and outputting a high level signal to the microcomputer 120 when the positive input voltage is greater than the negative input voltage; Second voltage divider resistors R3 and R4 for dividing the B + voltage supplied to the flyback transformer; The positive input terminal receives the B + voltage divided by the second voltage divider resistors R3 and R4, and the negative input terminal receives the reference voltage ( V _ref A second comparator (OP2) receiving 2) and outputting a high level signal to the microcomputer 120 when the positive input voltage is greater than the negative input voltage; Third voltage divider resistors R5 and R6 for dividing the voltage supplied to the horizontal deflection circuit; The positive input terminal receives the voltage divided by the third voltage divider resistors R5 and R6, and the negative input terminal receives the reference voltage ( V _ref 3) The third comparator OP3 outputs a high level signal to the microcomputer 120 when the positive input voltage is greater than the negative input voltage.

Next, the circuit operation of the first embodiment according to the present invention configured as described above will be described.

When the high voltage HV supplied to the anode of the water pipe rises above the rated voltage, the high voltage HV divided by the first voltage divider resistors R1 and R2 becomes the reference voltage of the first comparator OP1. V _ref Since it is greater than 1), the first comparator OP1 outputs a high level signal to the microcomputer 120.

Accordingly, the microcomputer 120 determines that an abnormality has occurred in the high voltage H.V and outputs a control signal to the voice IC 130.

The voice information output from the voice IC 130 by the control signal is converted into an audible frequency signal (for example, "an abnormality has occurred in the high voltage") through the speaker 140, and then amplified and output.

Next, the circuit operation of the second embodiment according to the present invention configured as described above will be described.

When the voltage B + supplied to the anode of the water pipe rises above the rated voltage, the voltage B + divided by the second voltage divider R3 and R4 becomes the reference voltage of the second comparator OP2. V _ref Since it is greater than 2), the first comparator OP2 outputs a high level signal to the microcomputer 220.

Accordingly, the microcomputer 220 determines that an abnormality occurs in the B + voltage and outputs a control signal to the OSD IC 230.

Corresponding character information (for example, "an abnormality occurred in B + voltage") output from the OSD IC 130 by the control signal is amplified by the video output circuit 240 and then displayed on the picture tube 250 screen. .

4 is a circuit diagram illustrating a third embodiment of a voltage rising display circuit of a monitor according to the present invention. As shown in FIG. 4, the apparatus of the present invention may have any one of a plurality of main voltages supplied to the monitor circuit. An overvoltage detector 310 for outputting an overvoltage detection signal according to the main voltage when the rated voltage is higher than the rated voltage; Current supplied according to the overvoltage detection signal ( I _1, I _2, I ₃ ) Is variable so that the display means 320 is variable in brightness or volume.

Here, the overvoltage detecting unit 310 includes: first voltage divider resistors R1 and R2 for dividing the high voltage HV supplied to the anode of the water pipe; The positive input terminal receives the high voltage HV divided by the first voltage divider resistors R1 and R2 and the negative input terminal receives the reference voltage ( V _ref A first comparator (OP1) receiving 1) and outputting a voltage of 5V when the positive input voltage is greater than the negative input voltage; The 5V voltage output from the first comparator OP1 is converted into a current component ( I ₁ A first current supply resistor (R7) which is converted into N) and supplied to the display means (320); Second voltage divider resistors R3 and R4 for dividing the B + voltage supplied to the flyback transformer; The positive input terminal receives the B + voltage divided by the second voltage divider resistors R3 and R4, and the negative input terminal receives the reference voltage ( V _ref A second comparator (OP2) for receiving 2) and outputting a voltage of 5V when the positive input voltage is greater than the negative input voltage; The 5V voltage output from the second comparator OP2 is converted into a current component ( I ₂ A second current supply resistor (R8) which is converted into N) and supplied to the display means (320); Third voltage divider resistors R5 and R6 for dividing the driving voltage HD.V supplied to the horizontal deflection circuit; The positive input terminal receives the driving voltage HD.V divided by the third voltage divider resistors R5 and R6, and the negative input terminal receives the reference voltage ( V _ref A third comparator (OP3) receiving 3) and outputting a voltage of 5V when the positive input voltage is greater than the negative input voltage; The 5V voltage output from the third comparator OP3 is converted into a current component ( I ₃ ) And a third current supply resistor (R9) supplied to the display means (320).

In this case, the display means 320 may be implemented as a light emitting diode whose color changes according to the amount of current. That is, when the amount of current flowing in the light emitting diode 320 is large, the light emitting diode 320 emits red light, and as the amount of current decreases, the light emitting diode 320 emits orange light and then emits blue light. .

Next, the circuit operation of the third embodiment according to the present invention configured as described above will be described.

First, the resistance value of the third current supply resistor R9 is set larger than the resistance value of the second current supply resistor R8, and the resistance value of the second current supply resistor R8 is set to the first current supply resistor R7. Set greater than the resistance value. Accordingly, currents passing through the first, second, and third current supply resistors R7, R8, and R9, respectively. I _1, I _2, I ₃ Is I ₃ <I ₂ <I ₁ Becomes

Accordingly, when the high voltage HV supplied to the anode of the water pipe rises above the rated value, the high voltage HV divided by the first voltage divider resistors R1 and R2 becomes the reference voltage of the first comparator OP1. ( V _ref Since the first comparator OP1 outputs a 5 V voltage and thus the 5 V voltage is output from the first comparator OP1, the first comparator OP1 outputs a 5 V voltage to the light emitting diode 320 through the first current supply resistor R7. electric current( I ₁ ) Is supplied and the light emitting diode 320 emits red light.

When the voltage B + supplied to the flyback transformer rises above the rated value, the voltage B + divided by the second voltage divider resistors R3 and R4 becomes the reference voltage of the second comparator OP2. V _ref 2), the second comparator OP2 outputs a 5V voltage, and accordingly, when the 5V voltage is output from the second comparator OP2, the second comparator OP2 outputs a 5V voltage to the light emitting diode 320 through the second current supply resistor R8. electric current( I ₂ ) Is supplied and the light emitting diode 320 emits orange.

In addition, when the driving voltage HD.V supplied to the horizontal deflection circuit rises above the rating, the driving voltage HD.V divided by the third voltage divider resistors R5 and R6 becomes the third comparator OP3. Reference voltage of V _ref 3), the third comparator OP3 outputs a 5V voltage, and accordingly, when the 5V voltage is output from the third comparator OP3, the third comparator OP3 outputs a 5V voltage to the light emitting diode 320 through a third current supply resistor R9. electric current( I ₃ ) Is supplied so that the light emitting diode 320 emits blue light.

In this case, the display means 320 may be implemented as a level meter whose level is variable according to the amount of current, and may also be implemented as a buzzer whose volume is variable according to the amount of current.

As described above, the device according to the present invention detects the main voltages of the monitor, such as high voltage, and outputs the information about the voltage rise above the rating to the speaker or to inform the user of the status by outputting on the water pipe screen It is effective.

Claims (5)

An overvoltage detecting unit 110 for outputting an overvoltage detecting signal when the main voltage supplied to the monitor circuit is equal to or higher than the rated voltage; A microcomputer 120 outputting a control signal when the overvoltage detection signal is input; A voice IC 130 for storing various voice information and outputting the voice information according to the control signal; And And a speaker (140) for converting and outputting the voice information into an audible frequency. An overvoltage detection unit 210 outputting an overvoltage detection signal when the main voltage supplied to the monitor circuit is equal to or higher than the rated voltage; A microcomputer 220 for outputting a control signal when the overvoltage detection signal is input; OSD IC 230 which stores various character information and outputs the corresponding character information by the control signal; And And a video output circuit (240) for amplifying the character information and displaying it on a screen of the water pipe (250). The overvoltage detecting unit 10 of claim 1, First voltage divider resistors R1 and R2 for dividing the high voltage H.V supplied to the anode of the water pipe; The positive input terminal receives the high voltage HV divided by the first voltage divider resistors R1 and R2 and the negative input terminal receives the reference voltage ( V _ref A first comparator (OP1) receiving 1) and outputting a high level signal to the microcomputer (120,220) when the positive input voltage is greater than the negative input voltage; Second voltage divider resistors R3 and R4 for dividing the B + voltage supplied to the flyback transformer; The positive input terminal receives the B + voltage divided by the second voltage divider resistors R3 and R4, and the negative input terminal receives the reference voltage ( V _ref A second comparator (OP2) for receiving a 2) and outputting a high level signal to the microcomputer (120,220) when the positive input voltage is greater than the negative input voltage; Third voltage divider resistors R5 and R6 for dividing the voltage supplied to the horizontal deflection circuit; The positive input terminal receives the voltage divided by the third voltage divider resistors R5 and R6, and the negative input terminal receives the reference voltage ( V _ref 3) The third comparator OP3 outputs a high level signal to the microcomputers 120 and 220 when the positive input voltage is greater than the negative input voltage. An overvoltage detecting unit 310 for outputting an overvoltage detecting signal according to the main voltage when any one of a plurality of main voltages supplied to the monitor circuit is equal to or greater than the rated voltage; Current supplied according to the overvoltage detection signal ( I _1, I _2, I ₃ ) Is a variable voltage display unit of the monitor, characterized in that consisting of a display means 320, the brightness or volume is variable. The method of claim 4, wherein the overvoltage detector 10, First voltage divider resistors R1 and R2 for dividing the high voltage H.V supplied to the anode of the water pipe; The positive input terminal receives the high voltage HV divided by the first voltage divider resistors R1 and R2 and the negative input terminal receives the reference voltage ( V _ref A first comparator (OP1) receiving 1) and outputting a voltage of 5V when the positive input voltage is greater than the negative input voltage; The 5V voltage output from the first comparator OP1 is converted into a current component ( I ₁ A first current supply resistor (R7) which is converted into N) and supplied to the display means (320); Second voltage divider resistors R3 and R4 for dividing the B + voltage supplied to the flyback transformer; The positive input terminal receives the B + voltage divided by the second voltage divider resistors R3 and R4, and the negative input terminal receives the reference voltage ( V _ref A second comparator (OP2) for receiving 2) and outputting a voltage of 5V when the positive input voltage is greater than the negative input voltage; The 5V voltage output from the second comparator OP2 is converted into a current component ( I ₂ A second current supply resistor (R8) which is converted into N) and supplied to the display means (320); Third voltage divider resistors R5 and R6 for dividing the voltage supplied to the horizontal deflection circuit; The positive input terminal receives the voltage divided by the third voltage divider resistors R5 and R6, and the negative input terminal receives the reference voltage ( V _ref A third comparator (OP3) receiving 3) and outputting a voltage of 5V when the positive input voltage is greater than the negative input voltage; The 5V voltage output from the third comparator OP3 is converted into a current component ( I ₃ And a third current supply resistor (R9) which is converted into the power supply and supplied to the display means (320).