KR100447602B1 - Miss-Convergence correction device of deflection yoke have protect function - Google Patents

Abstract

The present invention relates to a miss convergence correction device of deflection yoke, in particular, in the case of a system in which a comma-free coil for YHC distortion correction is connected in series, which is often provided when the coma-free coil is disconnected. Miss of deflection yoke with protection function that forms a current conduction path to prevent current from flowing only to the variable resistance side when the comaprile coil is disconnected in order to solve the problem of burning by suddenly large current conduction by the variable resistor. A convergence correction device.

Description

Miss-Convergence correction device of deflection yoke have protect function}

The present invention relates to a miss convergence correction device of deflection yoke. In particular, in the case of a system in which a comma-free coil for YHC distortion correction is connected in series, the comma-free coil is often disconnected. Missing deflection yoke with a protective function that forms a current conduction path to prevent current from flowing only to the variable resistor when the comma-free coil is disconnected in order to solve the problem of burning by suddenly conducting a large amount of current through the variable resistor. A convergence correction device.

Generally, deflection yoke is a device for deflecting an electron beam emitted from an electron gun of a cathode ray tube. Coma Free is the VCR (Ver.Center Raster) characteristic of deflection yoke, ie the center of red (R) / blue (B) and green (G) vertical misalignments at the measuring point on the vertical axis of the cathode ray tube. It makes the convergence sensitivity good.

In addition, misconvergence in the deflection yoke is displayed on the screen due to landing error, distortion error, and VCR distortion. This landing error refers to a misconvergence in which the electron beams R, G, and B scanned from the electron gun are not accurately scanned at each pixel on the screen, and are scanned from each pixel to the center of the screen or to the edge of the screen. (narrow) means misconvergence in a widened state.

In addition, the distortion error is a misconvergence in which the electron beams B, G, and R are scanned on the screen out of the upper and lower sides of the screen, or are driven to the center of the screen to prevent the beam from being scanned at the edges. It means the misconvergence of the barrelized or pinned state.

In addition, the VCR distortion is a misconvergence in which the red beam R and the blue beam B are accurately scanned on the screen, whereas the green beam G is not accurately scanned on each pixel of the screen, and an error occurs in the vertical direction.

1 is a circuit diagram of an apparatus for correcting misconvergence in such a conventional deflection yoke.

As shown therein, the first and second comaprial coils 51 and 52 are electrically connected to each other in series with respect to the vertical coil main part 10. The YHC misconvergence adjusting units R1 and YHC VR are connected in parallel to the first and second coma-free coils 51 and 52. The YHC misconverging adjusting units R1 and YHC VR are connected to the first and second coma. This is for adjusting the misconvergence on the screen by controlling the relative amount of current flowing through the pre-coils 51 and 52.

In addition, the third and fourth coma prim coils 53 and 54 are connected in parallel to the second coma prim coil 52, and a variable resistor (YH VR) for adjusting YH misconvergence is provided in the third and fourth comma prim coils 52 and 54. 4 are connected in parallel to the comma-free coils 53, 54.

The variable resistor (YH VR) for the YH misconvergence adjustment is to adjust the misconvergence (YH) of the screen by controlling the relative amount of current flowing through the third and fourth comma-free coils (53, 54).

In addition, the first and second diodes D1 and D2 are connected in reverse polarity to each other in parallel, and the YH variable resistor YH VR is connected to the cathode terminal of the first diode D1 and the anode terminal of the second diode D2. The second and third resistors R2 and R3 are connected in series and are connected to the YH variable resistor YH VR in parallel, and are connected to the second and third resistors R2 and R3. And a fourth resistor R4 connected to the connection points of the first and second diodes D1 and D2 and first and second coils (not given reference numbers) connected in parallel to the fourth resistor.

Therefore, the vertical deflection magnetic field is adjusted through the vertical coil main part 10, and the input voltage is input to the first and second coma prim coils 51 and 52.

Then, the YHC misconvergence adjusting units R1 and YHC VR control the relative current amount I flowing through the first and second coma precoils 51 and 52 to adjust the misconvergence on the screen.

In the conventional misconvergence correction device operating as described above, when any one of the coma-free coils referred to as 51 or 52 is disconnected, the current I1 through the vertical coil main part referred to as 10 is YHC misconvergence. As it rapidly flows into the variable coil (YHC VR) for adjustment, there is a problem that the variable coil (YHC VR) is burned and the system reliability is often lowered.

An object of the present invention for solving the conventional problems as described above relates to a miss convergence correction device of the deflection yoke (Mef Convergence), in particular, a system in which a comma-free coil for YHC distortion correction is connected in series In order to solve the problem that often the comafree coil is disconnected, the current flows to prevent the current from flowing only to the variable resistance side when the comafree coil is disconnected in order to solve the problem of combustion due to the rapid flow of a large current. The present invention provides a misconvergence correction device for a deflection yoke having a protective function forming a path.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit diagram of a misconvergence correction apparatus for a general deflection yoke.

2 is an exemplary configuration diagram of a misconvergence correction apparatus for a deflection yoke having a protection function according to the present invention.

3 and 4 are experimental data for setting the standard of use of the protective resistor.

In order to achieve the above object, a feature of the misconvergence correction apparatus for a deflection yoke having a protection function according to the present invention includes: first and second comma-free coils electrically connected in series with a vertical coil main part; A YHC misconvergence adjustment unit connected in parallel with the first and second comaprire coils to adjust a relative amount of current flowing through the first and second comaprire coils to adjust misconvergence on the screen; A first and second diodes connected in parallel with each other in reverse polarity, a YH variable resistor connected between a cathode terminal of the first diode and an anode terminal of the second diode, and a third connected in series and generally connected in parallel to the YH variable resistor. And a double middle tap TAP of the vertical coil V COIL connected in series between a fourth resistor, a connection point between the third and fourth resistors, and an anode terminal of the first diode and a cathode terminal of the second diode. Forming first and second coils; And a current connected in parallel with the first and second comafree coils in order to prevent excessive current from flowing to the YHC misconvergence adjusting unit when one of the first and second comafree coils is disconnected. Misconvergence correction device of the deflection yoke having a protective function, characterized in that it comprises a protective resistor to form.

In order to achieve the above object, as an additional feature of the misconvergence correction device of the deflection yoke having the protection function according to the present invention, the resistance value of the protection resistor has a rated condition of 2 watts, and has 4.7 Ω. .

The above object and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, with reference to Figure 2 attached to the misconvergence correction apparatus of the deflection yoke having a protective function according to the present invention as described above.

As shown in FIG. 2, the first and second comapreil coils 51 and 52 are electrically connected to each other in series with respect to the vertical coil main part 10. The YHC misconvergence adjusting units R1 and YHC VR are connected in parallel to the first and second coma-free coils 51 and 52. The YHC misconverging adjusting units R1 and YHC VR are connected to the first and second coma. This is for adjusting the misconvergence on the screen by controlling the relative amount of current flowing through the pre-coils 51 and 52.

At this time, in the present invention, the first and second coma pre-coil (51, 52) is provided with a protective resistor referred to by the reference number PR which is connected in parallel as a whole.

In addition, the third and fourth coma prim coils 53 and 54 are connected in parallel to the second coma prim coil 52, and a variable resistor (YH VR) for adjusting YH misconvergence is provided in the third and fourth comma prim coils 52 and 54. 4 are connected in parallel to the comma-free coils 53, 54.

The variable resistor (YH VR) for the YH misconvergence adjustment is to adjust the misconvergence (YH) of the screen by controlling the relative amount of current flowing through the third and fourth comma-free coils (53, 54).

In addition, the first and second diodes D1 and D2 are connected in reverse polarity to each other in parallel, and the YH variable resistor YH VR is connected to the cathode terminal of the first diode D1 and the anode terminal of the second diode D2. The second and third resistors R2 and R3 are connected in series and are connected to the YH variable resistor YH VR in parallel, and are connected to the second and third resistors R2 and R3. And a fourth resistor R4 connected to the connection points of the first and second diodes D1 and D2 and first and second coils (not given reference numerals) connected in parallel to the fourth resistor.

Therefore, the vertical deflection magnetic field is adjusted through the vertical coil main part 10, and the input voltage is input to the first and second coma prim coils 51 and 52.

Then, the YHC misconvergence adjusting units R1 and YHC VR adjust the misconvergence on the screen by controlling the relative amounts of current flowing through the first and second coma precoils 51 and 52.

At this time, if any one of the first or second comma-free coils (51, 52) is disconnected, the current flows only to the variable resistor (YHC VR) side for adjusting the YHC misconvergence, but in the present invention, Since the current I2 also flows in the PR, it is possible to prevent a problem that the variable resistance (YHC VR) of the YHC misconvergence adjustment unit is lost.

In addition, the protective resistor (PR) has a rated condition of 2 watts, based on the condition table shown in Figures 3 and 4 attached, the resistance value may be most preferably having a 4.7Ω.

Figure 3 shows the rating and temperature characteristics when the C / F COIL SHORT, Figure 4 is the temperature measurement data when using a protective resistor (4.7Ω, 2Watt) in the C / F OPEN state.

Although preferred embodiments of the present invention have been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, in the case of providing a misconvergence correction device for a deflection yoke having a protection function according to the present invention, in the case of a system in which a comma-free coil is connected in series, a sudden change to the variable resistor provided when the coma-free coil is disconnected is often provided. In order to solve the problem of combustion due to a large amount of current flowing, when the comafree coil is disconnected, it is possible to prevent the current from flowing only to the variable resistor side.

Claims (2)

First and second comafree coils electrically connected in series with the vertical coil main part; A YHC misconvergence adjustment unit connected in parallel to the first and second comaprider coils and controlling misconvergence on a screen by controlling a relative amount of current flowing through the first and second comaprider coils; A first and second diodes connected in parallel with each other in reverse polarity, a YH variable resistor connected between a cathode terminal of the first diode and an anode terminal of the second diode, and a third connected in series and generally connected in parallel to the YH variable resistor. And a double middle tap TAP of the vertical coil V COIL connected in series between a fourth resistor, a connection point between the third and fourth resistors, and an anode terminal of the first diode and a cathode terminal of the second diode. Forming first and second coils; And A parallel flow path is connected to the first and second comafree coils to form a current flow path to suppress excessive current from flowing to the YHC misconvergence adjusting unit when one of the first and second comafree coils is disconnected. Misconvergence correction device of the deflection yoke having a protective function, characterized in that it comprises a protective resistor. The method of claim 1, The resistance value of the protection resistor has a rated condition of 2 watts, the misconvergence correction device of the deflection yoke having a protection function characterized in that it has 4.7Ω.