KR910005358Y1 - Degaussing circuit of color monitor - Google Patents

Degaussing circuit of color monitor Download PDF

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Publication number
KR910005358Y1
KR910005358Y1 KR2019860014525U KR860014525U KR910005358Y1 KR 910005358 Y1 KR910005358 Y1 KR 910005358Y1 KR 2019860014525 U KR2019860014525 U KR 2019860014525U KR 860014525 U KR860014525 U KR 860014525U KR 910005358 Y1 KR910005358 Y1 KR 910005358Y1
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coil
self
relay
monitor
diode
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KR2019860014525U
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KR880007204U (en
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박원식
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대우전자 주식회사
김용원
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/16Picture reproducers using cathode ray tubes
    • H04N9/29Picture reproducers using cathode ray tubes using demagnetisation or compensation of external magnetic fields
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/42Flyback transformers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

내용 없음.No content.

Description

컬러모니터의 자동자기 소거회로Automatic Magnetic Clearing Circuit of Color Monitor

제 1 도는 본 고안의 회로도.1 is a circuit diagram of the present invention.

제 2 도는 시간에 따른 자기 코일전류의 파형Figure 2 waveform of magnetic coil current with time

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 자기소거코일 3 : 후라이백 트랜스1: magnetic erasing coil 3: fried bag trance

Y1: 릴레이Y 1 : relay

본 고안은 컬러 TV나 컬러모니터등에서 컬러브라운관의 자기(MAGNETIZED FIELD) 영향을 감소시키기 위하여 사용하는 자기소거회로(DEGAUSSING)에 관한 것이다.The present invention relates to a DEGAUSSING used to reduce the influence of the MAGNETIZED FIELD of the color CRT in a color TV or a color monitor.

통상적으로 컬러 TV나 컬러모니터등에서는 컬러브라운관의 자기소거를 위하여 자기소거회로를 사용하고 있는데, 현재 사용되고 있는 방법은 다음과 같다.In general, a color TV or a color monitor uses a magnetic erasing circuit for the self-cleaning of the color CRT. The current method is as follows.

즉 포지스타를 이용해서 자기코일을 동작시켜, 자기소거 동작을 행하는데, 이와 같은 방법에서는 일정시간 자기코일에 전류가 흘러 자기소거가 이루어지면서 포지스타가 열을 받아 저항값이 증가되며, 상대적으로 자기코일에는 미세한 전류가 흐르도록 구성되어 있을 뿐 자기코일에 흐르는 전류가 완전히 차단되지 않는다.That is, the magnetic coil is operated by using the positive star, and the self-erasing operation is performed. In this method, the current is flowed through the magnetic coil for a certain period of time, and the positive value is heated to increase the resistance. The magnetic coil is configured such that a minute current flows, and the current flowing in the magnetic coil is not completely blocked.

따라서 이와 같은 종전 회로에서는 항상 자기코일에는 미세한 전류가 흐르고 있으므로, 전원주파수와 컴퓨터의 수직주파수가 같은 경우에는 화면에 별다른 영향을 주지 않지만 컴퓨터의 수직주파수를 50HZ∼70HZ까지 사용할 경우는 전원주파수와 컴퓨터의 수직주파수와의 차이로 인하여 자기코일에 미세한 전류가 흘러도 컬러브라운관 화면에 영향을 준다.Therefore, in such a conventional circuit, a minute current flows in the magnetic coil at all times. Therefore, if the power frequency is equal to the vertical frequency of the computer, it does not affect the screen. Due to the difference between the vertical frequency and the minute current flowing in the magnetic coil, it affects the color CRT screen.

또한 상기와 같은 자기코일에 항시 미세한 전류가 흐르므로서, 포지스타는 항시 열을 받은 상태이므로 모니터를 계속 동작시키다가 끈후, 즉시 다시 동작을 시킬 경우는 자기소거회로에 충분한 전류가 흐르지 않아 자기소거가 이루어지지 못하는 등의 문제점이 있었다.In addition, since a minute current flows through the magnetic coil as described above, since the Posista is always in a heat state, if the monitor is continuously operated and then turned off and immediately operated again, sufficient current does not flow in the magnetic erasing circuit. There were problems such as not being made.

한편 근래에는 모니터의 외부에 별도의 스위치를 부착하여 필요시 마다 스위치를 온시켜, 자기소거회로에 전류를 공급하고 일정시간이 지나면 다시 스위치를 오프하는 방식도 사용하고 있으나 이와 같은 방법은 완전동작 조작으로서 매번 스위치를 조작하여야 하는 번거로움과 적기에 자기소거를 할 수가 없다는 문제점이 있었다.Recently, a separate switch is attached to the outside of the monitor to turn on the switch whenever necessary, supplying a current to the self-cleaning circuit, and turning off the switch again after a certain period of time. As a result, there is a problem that the switch has to be operated each time and the self-cancellation cannot be timely.

본 고안은 상기와 같은 점을 감안하여 모니터를 작동시키기 위하여 전원을 공급하면 자동으로 자기소거가 이루어지도록 자기소거회로를 구성한 것인데, 본 고안에서는 트랜지스터와 릴레이를 사용하여 자기소거회로를 구성하므로서, 최초 전원을 인가후 10초이내에 자기코일에 흐르는 전류를 차단하여 줌으로서 전원주파수와 컴퓨터 수직수파수와의 차이로 인한 간섭을 제거하고 또한 포지스타에 흐르던 전류도 차단함으로서 포지스타가 가열되지 않아 모니터를 동작시키다가 끈후 즉시 다시 동작시키더라도 자기소거가 되므로 훨씬 안정된 자기소거 효과를 얻을 수 있으며, 자기소거 동작이 모니터가 동작된 후 작동되므로 전원을 인가할 때 발생하는 셔지전류를 줄일 수 있어, 전원스위치 및 휴즈등에 무리가 가지 않는 특징등이 있다.The present invention is to configure the self-exhaust circuit so that the self-clearing is performed automatically when the power is supplied to operate the monitor in view of the above points, in the present invention is composed of a self-exhaust circuit using a transistor and a relay, It cuts off the current flowing in the magnetic coil within 10 seconds after the power is applied to remove the interference caused by the difference between the power frequency and the vertical frequency of the computer and also cuts off the current flowing in the positive star. Even if you turn it off immediately after turning it off, it becomes self-clearing, so you can get a much more stable self-clearing effect. Since the self-clearing operation is operated after the monitor is operated, you can reduce the surge current generated when applying power. And fuses, etc.

이하 본 고안을 첨부도면에 의하여 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

제 1 도에서(1)은 자기소거 코일이고, (2)는 모니터, (3)은 후라이백트랜스이며, Y1은 릴레이다.In FIG. 1, 1 is a self-exhaust coil, 2 is a monitor, 3 is a flyback transformer, and Y 1 is a relay.

자기소거코일(1)의 일단은 포지스타(PR1)를 통해 입력전원의 한 선과 직접 연결되어 있으며, 타단은 릴레이(Y1)의 접점을 통해 입력전원과 연결되었다.One end of the magnetic erasing coil (1) is directly connected to one line of the input power through the positive star (PR 1 ), the other end is connected to the input power through the contact of the relay (Y 1 ).

또한 릴레이(Y1)의 솔레노이트 코일 일단은 그라운드 되었으며, 타단은 PNP형 트랜지스터(Q1)의 콜렉터에 연결되었으며, 에미터는 후라이백 트랜스(3)의 12V전원과 연결되었다.In addition, one end of the solenoid coil of the relay (Y 1 ) was grounded, the other end was connected to the collector of the PNP type transistor (Q 1 ), and the emitter was connected to the 12V power supply of the flyback transformer (3).

트랜지스터(Q1)의 베이스와 에미터 사이에는 저항(R2) 제너다이오드(D1), 다이오드(D2)가 직열로 결합되었으며, 다이오드(D2)와 병렬로는 저항(R1)이 결합되고, 저항(R1)에는 콘덴서(C1)이 연결되어 그라운드 되었다.A resistor (R 2 ) zener diode (D 1 ) and a diode (D 2 ) are coupled in series between the base and the emitter of the transistor (Q 1 ), and the resistor (R 1 ) is in parallel with the diode (D 2 ). combined and, a resistance (R 1) has been ground is a capacitor (C 1) connected.

이와같이 구성된 본 고안의 동작 및 작용효과는 다음과 같다.The operation and effect of the present invention configured as described above are as follows.

처음 모니터를 사용하기 위하여 전원을 인가하면 모니터가 동작하면서 후라이백 트랜스(3)에서 12V의 전류가 다이오드(D2)를 통해점에 흐른다.When power is applied to use the monitor for the first time, the monitor operates and a 12V current flows through the diode (D 2 ) in the flyback transformer (3). Flow to the point.

이때,점의 전압은 저항(R1) 및 콘덴서(C1)의 시정수에 의하여 전압이 점차 높아지도록 되어 있다.At this time, The voltage at the point is gradually increased by the time constants of the resistor R 1 and the capacitor C 1 .

점에 흐른 전류는 처음 제너다이오드(D1)의 정격전압 보다 낮으므로 D1이 도통되어 전류가 트랜지스터Q1의 베이스에 인가되어, Q1의 에미터와 콜렉터간이 도통되므로 릴레이(Y1)의 솔레노이드 코일에는 12V의 전류가 흘러 릴레이의 접점을 연결시켜주므로 자기소거코일(1)에는 포지스타(PR1)를 통하여 순간적으로 대전류가 흘러 자기가 소거된다. Of the current flowing in that the first zener diode is lower than the rated voltage of the (D 1) is D 1 is conductive is applied to a current in the transistors Q 1 base, since the emitter and the collector simple conduction of Q 1 relay (Y 1) Since 12V current flows to the solenoid coil to connect the relay contacts, a large current flows momentarily through the positive star PR 1 through the magnetic erasing coil 1 to eliminate the magnetism.

이상태에서 포지스타(PR1)가 열을 받기 시작하면 포지스타의 저항 값이 증가해서 제 2 도에서와 같이 자기소거코일(1)에는 점차 전류가 감소된다.In this state, when the positive electrode PR 1 begins to heat, the resistance value of the positive electrode increases, and as shown in FIG. 2, the current gradually decreases in the magnetic erasing coil 1.

그러는 동안,점의 전압은 점차 증가하여 제너다이오드(D1)의 정격전압 보다 높아지면 제너다이오드(D1)가 Q1으로 흐르던 전류를 차단시켜주므로 트랜지스터(Q1)의 에미터와 콜렉터간에 차단된다.Meanwhile, If the voltage of the dot gradually increases and becomes higher than the rated voltage of the zener diode D 1 , the zener diode D 1 blocks the current flowing to Q 1 , and thus is cut off between the emitter and the collector of the transistor Q 1 .

따라서 릴레이(Y1)의 솔레노이드에 흐르던 12V의 전류가 차단되어 접점이 오프되므로 자기소거코일(1)에 흐르던 전류가 완저차단 되는 것이다.Therefore, since the 12V current flowing in the solenoid of the relay Y 1 is blocked and the contact is turned off, the current flowing in the self-erase coil 1 is completely blocked.

다이오드(D2)는 전원을 차단할시 콘덴서(C1)에 충전된 전압을 순간방전시켜 전원을 켰다 껐다 할 때의 오동작을 방지하는 기능을 한다.The diode (D 2 ) serves to prevent a malfunction when the power is turned on and off by instantaneous discharge of the voltage charged in the capacitor (C 1 ) when the power is cut off.

이상과 같이 본 고안은 전원을 인가한 후 10초 이내에 자기코일에 흐르는 전류를 차단하므로 전원주파수와 컴퓨터의 수직주파수와의 차이로 인한 간섭을 제거하고, 또한 포지스터에 흐르는 전류를 차단하므로 모니터가 동작되더라도 포지스타는 열이 점차식어서 모니터를 계속동작시키다가 끈후 즉시 다시 모니터를 동작시키더라도 자기소거 효과가 나타나므로 훨씬 안전한 자기소거효과를 얻을 수 있다.As described above, the present invention cuts off the current flowing in the magnetic coil within 10 seconds after the power is applied, thereby eliminating interference caused by the difference between the power frequency and the vertical frequency of the computer, and also cutting off the current flowing through the positioner. Even if it is activated, the Posista can get a much safer self-erasing effect because the self-extinguishing effect occurs even if the monitor keeps operating and turns off the monitor immediately after turning off.

또한 자기소거 동작이 모니터가 동작된 후 작동되므로 전원을 인가할 때 생기는 셔지전류를 줄어주므로 전원 스위치 및 휴즈등의 셔지 전류로 인한 문제점을 감소시킨다.In addition, since the self-cleaning operation is operated after the monitor is operated, it reduces the surge current generated when the power is applied, thereby reducing the problems caused by the surge current of the power switch and the fuse.

Claims (1)

일측이 포지스타(PR1)를 통해 입력전원이 일측선에 연결된 자기소거코일(1)의 타측을 릴레이(Y1)의 접점을 통해 입력전원의 타측선에 연결한 통상의 소거회로에 있어서, 릴레이(Y1)의 솔레노이드 코일은 에미터가 후라이백트랜스(3)에 연결된 트랜지스터(Q1)의 콜렉터에 연결하였으며, 트랜지스터(Q1)의 베이스와 에미터간에는 저항(R2) 제너다이오드(D1) 및 다이오드(D2)를 직열로 결합시키고, 다이오드(D2)와 병렬로는 저항(R1)을 결합하며, (R1)에 결합된 콘덴서(C1)를 그라운드 시켜서된, 컬러 모니터의 자동자기소거 회로.In a conventional erasing circuit, one side of which is connected to the other side of the input power supply via the contact of the relay (Y 1 ) the other side of the magnetic erasing coil ( 1 ), the input power is connected to one side line through the positive star (PR 1 ), The solenoid coil of the relay (Y 1 ) is connected to the collector of the transistor (Q 1 ) whose emitter is connected to the flyback transformer (3), and a resistor (R 2 ) zener diode () between the base of the transistor (Q 1 ) and the emitter ( By combining D 1 ) and diode (D 2 ) in series, coupling resistor (R 1 ) in parallel with diode (D 2 ), and grounding capacitor (C 1 ) coupled to (R 1 ), Automatic self-clearing circuit of color monitor.
KR2019860014525U 1986-09-22 1986-09-22 Degaussing circuit of color monitor KR910005358Y1 (en)

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Application Number Priority Date Filing Date Title
KR2019860014525U KR910005358Y1 (en) 1986-09-22 1986-09-22 Degaussing circuit of color monitor

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Application Number Priority Date Filing Date Title
KR2019860014525U KR910005358Y1 (en) 1986-09-22 1986-09-22 Degaussing circuit of color monitor

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KR880007204U KR880007204U (en) 1988-05-31
KR910005358Y1 true KR910005358Y1 (en) 1991-07-22

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