KR970023500A - CRT focus voltage stabilization circuit using high frequency components - Google Patents

CRT focus voltage stabilization circuit using high frequency components Download PDF

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Publication number
KR970023500A
KR970023500A KR1019950037640A KR19950037640A KR970023500A KR 970023500 A KR970023500 A KR 970023500A KR 1019950037640 A KR1019950037640 A KR 1019950037640A KR 19950037640 A KR19950037640 A KR 19950037640A KR 970023500 A KR970023500 A KR 970023500A
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KR
South Korea
Prior art keywords
voltage
circuit
high frequency
focus
frequency component
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KR1019950037640A
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Korean (ko)
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KR0174624B1 (en
Inventor
주재용
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배순훈
대우전자 주식회사
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Priority to KR1019950037640A priority Critical patent/KR0174624B1/en
Publication of KR970023500A publication Critical patent/KR970023500A/en
Application granted granted Critical
Publication of KR0174624B1 publication Critical patent/KR0174624B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
    • H04N3/185—Maintaining dc voltage constant
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/42—Flyback transformers

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

본 발명은 TV의 CRT에 공급되어 휘도에 영향을 주는 전자빔의 분포 상태를 조정하는 포커스 전압을 조정하기 위한 회로에 관한 것으로서, 더욱 구체적으로는 화면의 휘도에 따라서 플라이백 변성기(FBT)의 고압 변동으로 인하여 발생되는 포커스 전압을, FBT 고압의 변동에 관계없이 안정적으로 공급하기 위한 포커스 전압 안정화 회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit for adjusting a focus voltage for adjusting a distribution state of an electron beam, which is supplied to a CRT of a TV and affects brightness, and more specifically, high voltage fluctuation of a flyback transformer (FBT) according to the brightness of a screen. The present invention relates to a focus voltage stabilization circuit for stably supplying a focus voltage generated due to the FBT, regardless of a change in the FBT high voltage.

본 발명의 포커스 전압 안정화 회로는, R, G, B 신호을 처리하여 CRT에 출력하기 위한 영상 출력 회로와, 상기 CRT를 구동시키기 위한 전압을 공급하는 FBT를 포함하는 TV에 있어서, 상기 영상 출력 회로로부터 출력되는 고역 주파수 성분중의 특정 성분을 여과하기 위한 고역 성분 검출 회로와, 상기 고역 성분 검출 회로로부터 출력된 신호를 기초로하여 이에 상응하는 DC 전압으로 변화하는 고역 성분 전압공급 회로와, 상기 고역 성분 전압공급 회로로부터 입력된 전압의 대소에 따라서 고압에 상응하는 전압을 상기 FBT로부터 출력되는 포커스 출력 전압에 부가하기 위한 포커스 전압 부가 회로로 구성되는 것을 특징으로 한다.The focus voltage stabilization circuit of the present invention comprises an image output circuit for processing and outputting R, G, and B signals to a CRT, and an FBT for supplying a voltage for driving the CRT. A high frequency component detecting circuit for filtering a specific component among the high frequency components to be output, a high frequency component voltage supply circuit changing to a corresponding DC voltage based on a signal output from the high frequency component detecting circuit, and the high frequency component And a focus voltage adding circuit for adding the voltage corresponding to the high voltage to the focus output voltage output from the FBT according to the magnitude of the voltage input from the voltage supply circuit.

Description

고역 성분을 이용한 CRT 포커스 전압 안정화 회로CRT focus voltage stabilization circuit using high frequency components

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제4도는 본 발명에 따른 포커스 전압 안정화 회로의 개략적인 블럭도,4 is a schematic block diagram of a focus voltage stabilization circuit according to the present invention;

제5도는 제3도의 포커스 전압 조정 회로의 일실시예,FIG. 5 is an embodiment of the focus voltage adjusting circuit of FIG.

제6도는 영상 출력 회로로부터 출력되는 고역 주파수 성분을 나타내는 신호 파형도이다.6 is a signal waveform diagram showing a high frequency component output from an image output circuit.

Claims (4)

R, G, B 신호을 처리하여 CRT(6)에 출력하기 위한 영상 출력 회로(2)와, 상기 CRT(6)를 구동시키기 위하여 전극(8)에 고압과 단자(G3)에 포커스 전압을 공급하는 FBT(4)를 포함하는 TV에 있어서, 상기 영상 출력 회로(2)로부터 출력되는 고역 주파수 성분중의 특정 성분을 여과하기 위한 고역 성분 검출 회로(10); 상기 고역 성분 검출 회로(10)로부터 출력된 특정 고역 주파수 신호를 그것에 상응하는 DC 전압으로 변화시키는 고역 성분 전압공급 회로(12); 및 상기 고역 성분 전압공급 회로(12)로부터 출력된 전압의 대소에 따라서 FBT(4)의 포커스 전압에 소정의 전압치를 부가하기 위한 포커스 전압 부가 회로(14)를 포함하는 것을 특징으로 하는 포커스 전압 안정화 회로.An image output circuit 2 for processing R, G, and B signals and outputting them to the CRT 6, and supplying a high voltage to the electrode 8 and a focus voltage to the terminal G3 to drive the CRT 6. A TV comprising an FBT (4), comprising: a high frequency component detection circuit (10) for filtering a specific component among the high frequency components output from the video output circuit (2); A high frequency component voltage supply circuit (12) for converting a specific high frequency signal output from the high frequency component detection circuit (10) into a DC voltage corresponding thereto; And a focus voltage adding circuit (14) for adding a predetermined voltage value to the focus voltage of the FBT (4) according to the magnitude of the voltage output from the high frequency component voltage supply circuit (12). Circuit. 제1항에 있어서, 상기 고역 성분 검출 회로(10)가 특정 고주파 성분만을 통과시키기 위한 수직, 수평 고역 통과 필터(HPF)인 것을 특징으로 하는 포커스 전압 안정화 회로.2. The focus voltage stabilization circuit according to claim 1, wherein the high pass component detection circuit (10) is a vertical, horizontal high pass filter (HPF) for passing only a specific high frequency component. 제1항에 있어서, 상기 고역 성분 전압공급 회로(12)로부터 출력되는 DC 전압이 고역 성분의 주파수가 높은 부분에서 전압이 높고 주파수가 낮은 부분에서는 전압이 낮은 분포를 가지고 출력하는 것을 특징으로 하는 포커스 전압 안정화 회로.2. The focus according to claim 1, wherein the DC voltage output from the high frequency component voltage supply circuit 12 outputs a voltage having a high voltage at a portion where the frequency of the high frequency component is high and a low voltage at a portion where the frequency is low. Voltage stabilization circuit. 제1항에 있어서, 상기 포커스 전압 부가 회로(14)로부터 부가되는 전압(QV)의 변동 범위가 1.5KV 이내인 것을 특징으로 하는 포커스 전압 안정화 회로.The focus voltage stabilization circuit according to claim 1, wherein the variation range of the voltage (QV) added from said focus voltage adding circuit (14) is within 1.5 KV. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950037640A 1995-10-27 1995-10-27 CRT focus voltage stabilization circuit using high frequency components KR0174624B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950037640A KR0174624B1 (en) 1995-10-27 1995-10-27 CRT focus voltage stabilization circuit using high frequency components

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950037640A KR0174624B1 (en) 1995-10-27 1995-10-27 CRT focus voltage stabilization circuit using high frequency components

Publications (2)

Publication Number Publication Date
KR970023500A true KR970023500A (en) 1997-05-30
KR0174624B1 KR0174624B1 (en) 1999-04-01

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KR1019950037640A KR0174624B1 (en) 1995-10-27 1995-10-27 CRT focus voltage stabilization circuit using high frequency components

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