KR19990028846U - Electromagnetic shielding device of high pressure detachable monitor - Google Patents

Abstract

The present invention relates to an electromagnetic wave shielding device for blocking harmful electromagnetic waves generated in front of the water pipe of the high-voltage separation monitor.

According to the present invention, when the negative driving power induced from the dummy transformer 93 connected between the horizontal deflection DC / DC converter 80 and the horizontal output unit 70 is applied to the pulse generator 92, the pulse generator 92 is applied. Generates negative pulses having the same frequency and phase as the positive electromagnetic waves emitted from the front surface of the water pipe, and is applied to the electromagnetic wave removing wire 91 integrally mounted along the front outer surface of the water pipe, thereby It is designed to completely remove harmful electromagnetic waves emitted.

Description

An apparatus for shielding electro-magnetic waves in a monitor being separated high voltage section from horizontal deflection section

The present invention relates to an electromagnetic wave shielding device for blocking harmful electromagnetic waves generated in front of the water pipe of the high-pressure separation type monitor.

In general, the high-voltage separate monitor separates the primary winding of the horizontal output unit and the flyback transformer (FBT), and at the same time using a separately installed switching means, a high voltage B + voltage that is always supplied at a predetermined level to the primary winding of the flyback transformer. A monitor having a high voltage generating circuit configured to generate an anode high voltage (HV) of a water pipe by intermittent operation, wherein a monitor in which the horizontal output unit and the flyback transformer are integrated, the video of the flyback transformer is changed. As the B + voltage for high voltage induced in the primary winding is changed, the anode current of the water pipe is changed as well as the vertical / horizontal size and brightness of the screen are abnormally resolved when the anode high voltage is also varied. .

In the high-voltage separation type monitor as described above, various voltages required for the water pipe are provided from a high voltage generating circuit as shown in FIG. 1, and the high voltage generating circuit includes a main power supply (SMPS) 10 and a high voltage switching unit 20. , A high voltage DC / DC converter 30, a flyback transformer 40, a horizontal oscillator 50, a horizontal driver 60, a horizontal output unit 70, and the like. Here, the DC voltage output from the SMPS 10 is converted into a high voltage B + voltage by the high voltage switching unit 20 and the high voltage DC / DC converter 30 to convert the primary winding of the flyback transformer 40. By applying to the anode high-voltage (HV) is induced on the secondary winding side of the flyback transformer 40, the horizontal drive unit 60, the horizontal output unit 70 and the horizontal deflection DC / DC converter 80 ) Is converted into the horizontal deflection B + voltage and applied to the horizontal deflection coil (H.DY).

At this time, the anode high voltage generated in the secondary winding of the flyback transformer 40 is applied to the anode of the water pipe, and is divided into a specific value by a plurality of voltage distribution resistors so that the focus grid, the screen grid, and the acceleration grid of the water pipe. It is applied to the back and the like, and in particular, the anode high-pressure alternating current (Ripple) of the same frequency as the horizontal drive signal is mixed, causing a low frequency electromagnetic wave harmful to the human body is emitted from the front of the water pipe.

Therefore, most of the high-voltage separation type monitor is equipped with a device for blocking the above electromagnetic waves, the installation standards are in accordance with the standards of the electromagnetic wave protection protocol (TCO) proposed by the Swedish Professional Users Association in 1991, such electromagnetic waves As shown in Tables 1 and 2 below, the standards for the prevention protocol are provided separately for the alternating electric field and the alternating magnetic field.

Specification for alternating electric field MPR 2 TCO (MPR 3) Frequency range ELF (5 ㎐ to 2 ㎑) VLF (2㎑ to 400㎑) ELF (5 ㎐ to 2 ㎑) VLF (2㎑ to 400㎑) Limit 25 V / m 2.5 V / m 10 V / m 1 V / m Measuring distance 50 cm 50 cm Front 30 cm Front 30 cm, 50 cm

Specification for alternating magnetic fields MPR 2 TCO (MPR 3) Frequency range ELF (5 ㎐ to 2 ㎑) VLF (2㎑ to 400㎑) ELF (5 ㎐ to 2 ㎑) VLF (2㎑ to 400㎑) Limit 250 nT 25 nT 200 nT 25 nT Measuring distance 50 cm 50 cm Front 30 cm, 50 cm 50 cm

FIG. 2 is a diagram illustrating an electromagnetic wave shielding device of a general high voltage detachable monitor, and a negative polarity for attenuating low frequency positive electromagnetic waves by using a negative power supplied from the flyback transformer 40. When the negative pulse output from the pulse generator 90 generating the negative pulse is applied to the electromagnetic wave removing wire 91 integrally mounted along the front edge of the water pipe, the positive electromagnetic wave is attenuated. That is, as shown in (b) of FIG. 3, the negative pulse output from the pulse generator 80 is a waveform having the same frequency but the opposite phase with respect to the positive electromagnetic wave shown in (a) of FIG. 3. Since the positive electromagnetic wave and the negative pulse cancel each other, the electromagnetic wave emitted from the front surface of the water pipe is removed.

However, as described above, the electromagnetic wave blocking device of the high-voltage separation type monitor is configured to generate a negative pulse for attenuating the electromagnetic wave emitted from the front surface of the water pipe using the negative power supplied from the flyback transformer 40. In this case, the phase difference between the negative pulse and the actual positive electromagnetic wave occurs, and thus there is a problem that the harmful electric vehicle cannot be completely blocked. That is, the frequency and phase of the electromagnetic wave emitted from the front surface of the water pipe are directly affected by the horizontal deflection current flowing through the horizontal deflection coil (H.DY) through the horizontal output unit 70. Negative pulse generated to remove the electromagnetic wave is frequency and phase is determined by the negative power source output from the flyback transformer 40, so that the phase of the negative pulse and the positive electromagnetic wave is different.

Accordingly, the present invention is to remove the electromagnetic waves emitted from the front surface of the water pipe by directly using the horizontal deflection B + voltage applied to the horizontal output unit through the horizontal deflection DC / DC converter in order to solve the above problems. It is an object of the present invention to provide an electromagnetic wave shielding device of a high-voltage separation type monitor that is configured to generate a negative pulse.

The present invention devised to achieve the above object is, the flyback transformer for generating the anode high pressure supplied to the anode of the water pipe and the horizontal output unit for the horizontal deflection current flows to the horizontal deflection coil is separated from each other, A high-voltage separate monitor that allows a horizontal deflection current to flow in the horizontal deflection coil by interrupting the horizontal deflection B + voltage supplied from a horizontal deflection DC / DC converter generating a horizontal deflection B + voltage by a horizontal drive signal. And a dummy transformer configured to sense a change in the horizontal deflection B + voltage applied from the horizontal deflection DC / DC converter and applied to the horizontal output unit to induce a negative driving power source; When the negative driving power output from the dummy transformer is supplied, a negative (-) pulse is generated to attenuate the electromagnetic waves emitted from the front surface of the water pipe, and the electromagnetic wave removing wire is integrally mounted along the front outer surface of the water pipe. It characterized in that it comprises a pulse generator to be applied to.

The apparatus of the present invention configured as described above, when the negative driving power induced from the dummy transformer connected between the horizontal deflection DC / DC converter and the horizontal output unit is applied to the pulse generator, Harmful electromagnetic waves emitted from the front surface of the water pipe by generating a negative pulse having the same frequency and phase as the positive electromagnetic waves emitted from the front surface of the correlator and applying them to the electromagnetic wave removing wire integrally mounted along the front edge of the water pipe. Is to be completely removed.

1 is a view showing a high pressure generating circuit of a general high pressure detachable monitor;

2 is a view showing an electromagnetic wave shielding device of a general high-voltage separation monitor,

3 is a waveform diagram for explaining the operation of the vehicle blocking device shown in FIG.

4 is a view showing an electromagnetic wave shield according to the present invention.

Explanation of symbols on the main parts of the drawings

10: power supply (SMPS) 20: high pressure switching unit

30: high voltage DC / DC converter 40: flyback transformer

50: horizontal oscillation unit 60: horizontal driving unit

70: horizontal output unit 80: DC / DC converter for horizontal deflection

90,92: pulse generator 91: electromagnetic wave removal wire

93: dummy transformer

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

4 is a view showing the electromagnetic wave shielding device of the high-voltage separation monitor according to the present invention.

As shown in FIG. 4, an embodiment according to the present invention has a horizontal deflection current flowing through the flyback transformer 40 and the horizontal deflection coil H.DY, which generates the anode high pressure supplied to the anode of the water pipe. The horizontal output unit 70 is separated from each other, and the horizontal deflection B + voltage supplied from the horizontal deflection DC / DC converter 80 generating the horizontal deflection B + voltage. In the high-voltage separation type monitor which causes a horizontal deflection current to flow in the horizontal deflection coil (H.DY) by intermittently by the horizontal drive signal, the horizontal deflection DC / DC converter 80 is output from the horizontal deflection unit ( A dummy transformer 93 which senses a change in the horizontal deflection B + voltage applied to 70) and induces a negative driving power; When the negative driving power output from the dummy transformer 93 is supplied, a negative pulse (-) is generated to attenuate the electromagnetic waves emitted from the front side of the water pipe, and thus, electromagnetic waves are integrally mounted along the front outer surface of the water pipe. And a pulse generator 92 applied to the removal wire 91.

Referring to the operation of the embodiment according to the present invention configured as described above are as follows.

If the horizontal output unit 70 performs a switching operation to interrupt the horizontal deflection B + voltage output from the horizontal deflection DC / DC converter 80, the horizontal output is output to the horizontal deflection coil H.DY. Each time the horizontal output transistor of the unit 70 is turned on / off, a horizontal deflection current flows such that the electron beam emitted from the electron gun of the receiving tube is scanned from the left end of the receiving tube to the right end.

At this time, the frequency and phase of the positive electromagnetic wave emitted from the front of the receiving tube is varied according to the period of the horizontal deflection current, the frequency and phase of the positive electromagnetic wave is shown in Figure 4, the horizontal deflection DC It is coincided with the negative driving power induced in the dummy transformer 93 provided between the / DC converter 80 and the horizontal output unit 70. That is, the period in which the horizontal deflection B + voltage output from the horizontal deflection DC / DC converter 80 is interrupted by the switching operation of the horizontal output unit 70 and the horizontal flow flowing through the horizontal deflection coil H.DY. The period of the deflection current is coincident.

Therefore, when the negative driving power induced from the dummy transformer 93 flows into the pulse generator 92, the pulse generator 92 has the same phase as that of the positive electromagnetic wave emitted from the front surface of the water pipe. When the negative pulse output from the pulse generator 92 is applied to the electromagnetic wave removal wiper 91 integrally mounted along the outside of the water pipe, the positive electromagnetic wave and the negative pulse are mutually Since the phases coincide, they are completely canceled out to remove the electromagnetic waves emitted from the front of the receiver.

As described above, in accordance with the present invention, a portion representing the same phase as the electromagnetic wave emitted from the front surface of the water pipe by directly using the horizontal deflection B + voltage applied to the horizontal output portion through the horizontal deflection DC / DC converter. By removing the electromagnetic waves by generating a polarity pulse, there is an effect that can completely block the electromagnetic waves emitted from the front surface of the water pipe in accordance with the standard of the electromagnetic wave prevention protocol (TCO).

Claims (1)

The flyback transformer 40 generating the anode high pressure supplied to the anode of the water pipe and the horizontal output unit 70 for allowing a horizontal deflection current to flow in the horizontal deflection coil H.DY are separated from each other, and the horizontal output The horizontal deflection B + voltage supplied from the horizontal deflection DC / DC converter 80 which generates a horizontal deflection B + voltage to the horizontal deflection coil H.DY is interrupted by a horizontal drive signal. In the high pressure separation type monitor which allows a horizontal deflection current to flow, A dummy transformer 93 for detecting a change in the horizontal deflection B + voltage applied from the horizontal deflection DC / DC converter 80 and applied to the horizontal output unit 70 to induce a negative driving power; ; When the negative driving power output from the dummy transformer 93 is supplied, a negative pulse (-) is generated to attenuate the electromagnetic waves emitted from the front side of the water pipe, and thus, electromagnetic waves are integrally mounted along the front outer surface of the water pipe. Electromagnetic shielding device of the monitor, characterized in that it comprises a pulse generator (92) to be applied to the removal wire (91).