KR0131537B1 - Degaussing circuit for image display apparatus - Google Patents

Abstract

A degaussing circuit of an image outputting apparatus is disclosed. The apparatus has a degaussing coil(1) and a first thermistor(P1). A second thermistor(P2) is connected to a first thermistor(P1) in parallel. A vibration sensor(13) provides a sensed current being proportion to the vibration of the image outputting apparatus. A comparator(14) compares the sensed current of the vibration sensor(13) to a predetermined value. An operating unit(12) operates a second relay(11) according to the comparing result of the comparator(11).

Description

Device Circuit of Image Output Device

1 is a circuit diagram showing a degaussing circuit according to the prior art.

FIG. 2 is a characteristic curve diagram illustrating resistance characteristics with respect to the temperature of the temperature sensor P1 in FIG.

3 is a circuit diagram showing an element circuit of an image output apparatus according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

1: remote control unit 2: receiver

3: plug 4: main power supply

5: first relay 6: first relay driver

11: second relay 12: second relay drive unit

13 vibration sensor 14 comparison unit

DC: Element coil P1, P2: Temperature sensor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an element circuit of an image output apparatus, and more particularly, to an element circuit capable of automatically executing an element operation when a predetermined shock or more is applied. In general, in an image output apparatus such as a television receiver or a monitor, when a power is turned on to operate the apparatus, a magnetic substance such as a shadow mask of a cathode ray tube (CRT) is magnetized by an electron beam emitted from a cathode, or the like. When the magnetic material is magnetized in this manner, the electron beam scanned onto the fluorescent film of the CRT is distorted, thereby degrading color purity. Therefore, in the related art, an element circuit for performing element operation by installing a degaussing coil for elemental magnetized magnetic material and driving the element coil for a predetermined time at power-on is used. 1 is a circuit configuration diagram showing an element circuit currently used in a television receiver, in which 1 is a remote control device, 2 is a receiving unit for receiving infrared data from the remote control device 1, 3 is a power plug, 4 is A main power supply unit such as a switching mode power supply (SMPS) for supplying operating power to the entire image output apparatus, 5 is a first relay for intermittent power supply to the main power supply unit 4, and 6 is a first relay 5 The first relay driving unit 7 for driving is a standby power supply unit for supplying standby power to the microprocessor 8. In addition, reference numeral 8 denotes a microprocessor, which, when a power-on signal is applied from the remote control apparatus 1 through the receiver 2, turns on the first relay 5 by the first relay driver 6 to turn on the plug ( The entire apparatus is operated by allowing external power from 3) to be applied to the main power source 4.

In the drawings, reference numeral DC denotes an element coil for demagnetizing the magnetic body by flowing strong alternating current around the magnetic body of the CRT, and P1 is a static dummyster. That is, in the above configuration, when the microprocessor 8 turns on the first relay 5 according to the power-on signal from the remote control device 1, excessive alternating current is generated through the dummyster P1 and the element coil CD. By the flow of the element, the device operation is executed. When the overcurrent flows in this way, heat is generated from the device coil DC. Accordingly, the resistance value of the dummy coil P1 increases exponentially as shown in the characteristic curve of FIG. By blocking the current flowing through), the element operation by the element coil DC is stopped and input power is supplied to the main power supply unit 4 to operate the device.

By the way, the above-mentioned element apparatus has the following problems. In general, when watching a TV or monitor and changing its position or direction as necessary, magnetism of the CRT occurs due to the effect of the geomagnetic field on the CRT. In the case of the above-described device circuit, since the device operates only when the device is turned on, when the image output device is magnetized as described above, the power must be turned off and on again. do.

Therefore, there is a disadvantage that the operation of the device is not only troublesome but also shortens the life of the image output apparatus. In particular, in the device circuit described above, once the device operation is performed, the resistance of the dummyster P1 rises, even if the power is turned off and on again until the temperature of the dummyster P1 decreases below a certain level. Since the magnetization operation does not occur, this sometimes causes a problem of watching a TV or monitor with the CRT magnetized. Accordingly, an object of the present invention is to provide a device circuit of an image output apparatus that is capable of automatically executing a magnetization operation of a CRT when a shock is applied to a device at a predetermined level or more. . An element circuit of an image output apparatus according to the present invention for achieving the above object is an image output apparatus including a device coil and a first demister of series connection coupled in parallel to a power input terminal, in parallel with the first demister A second relay connected to the second demister, a second relay mounted on the current path of the second demister for controlling the current flowing into the second demister, and a vibration outputting a sense current in response to the vibration applied to the image output apparatus. And a second relay driver for switching the second relay according to a detection result of the sensor, the comparison unit detecting whether the sensed current output from the vibration sensor is greater than or equal to a predetermined value.

According to the present invention having the above-described configuration, the magnetization operation is automatically performed when a predetermined or more impact is applied to the device, thereby greatly improving the user's convenience. Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.

3 is a block diagram showing an element circuit of an image output apparatus according to an embodiment of the present invention, which shows the case where the present invention is applied to a television receiver. In addition, in FIG. 3, the same reference numerals are attached to the same parts as in FIG.

In FIG. 3, the second demister P2 is provided in parallel with the existing magnetic erasing dummyster P1, and the second demister P2 flows to the dummyster P2 on the current path of the second demister P2. The second relay 11 for interrupting the current is provided. The second relay 11 is controlled to be turned on / off in accordance with the driving of the second relay driver 12.

Further, reference numeral 13 denotes a vibration sensor installed in the television receiver and outputting a sensing current proportional to the vibration applied to the receiver, and 14 denotes whether the sensing current output from the vibration sensor 13 is greater than or equal to a predetermined value. As a comparator, the comparator 14 controls the second relay driver 12 when the vibration sensor 13 detects a vibration that may cause the CRT to be magnetized by the viewer changing the position or orientation of the television receiver. By turning on the second relay 11, the element operation by the element coil DC is executed. At this time, the device operation is performed by the power from the power plug 3 flowing through the device coil DC, the second relay 11 and the second demister P2. The same operation as the element operation by the Mr. P1 is made, and the first demister M1 is turned off once the power is turned on and the element operation is executed until the temperature is lowered below a certain level. Since the state is maintained, the device operation by the second demister P2 is not affected. In addition, it is preferable that the second demister M2 has the same temperature-resistance characteristic as that of the first demister M1, which is usually DP = A × T stage: DP is degaussing power. A is the peak current I _pp T flowing in the device coil DC and maintains high quality color purity when the device power DP, which is expressed by the number of turns (trrn number) of the device coil DC, is set to an optimal state. Because it can. That is, in the above embodiment, the device operation is automatically performed by detecting a shock or more applied to the device, and the device operation is performed regardless of whether the device operation has been performed before, and thus the viewer's convenience is improved. Significantly improved. In addition, the present invention is not limited to the above embodiments and may be modified without departing from the technical scope of the present invention. As described above, according to the present invention, it is possible to realize the element circuit of the image output apparatus that can automatically execute the magnetization operation in response to the impact applied to the apparatus.

Claims (1)

An image output apparatus including a device coil (DC) and a first demister (P1) in series connected in parallel to a power input terminal, the second demister (P2) connected in parallel with the first demister (P1). ), A second relay 11 installed on the current path of the second demister P2 to control the current flowing through the second demister P2, and a sensing current proportional to the vibration applied to the image output device. A vibration sensor 13 for outputting a signal, a comparison unit 14 for detecting whether a detection current output from the vibration sensor 13 is stationary or abnormal, and the second relay 11 according to a detection result of the comparison unit 14. And a second relay unit (12) for switching driving.