KR850000159Y1 - Raster adjestment circuit - Google Patents

Raster adjestment circuit Download PDF

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Publication number
KR850000159Y1
KR850000159Y1 KR2019820007316U KR820007316U KR850000159Y1 KR 850000159 Y1 KR850000159 Y1 KR 850000159Y1 KR 2019820007316 U KR2019820007316 U KR 2019820007316U KR 820007316 U KR820007316 U KR 820007316U KR 850000159 Y1 KR850000159 Y1 KR 850000159Y1
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KR
South Korea
Prior art keywords
circuit
power supply
resistor
voltage
raster
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KR2019820007316U
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Korean (ko)
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KR840001817U (en
Inventor
김봉재
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삼성전자공업주식회사
강진구
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Priority to KR2019820007316U priority Critical patent/KR850000159Y1/en
Publication of KR840001817U publication Critical patent/KR840001817U/en
Application granted granted Critical
Publication of KR850000159Y1 publication Critical patent/KR850000159Y1/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
    • H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
    • H04N3/223—Controlling dimensions

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)

Abstract

내용 없음.No content.

Description

텔레비젼의 라스타폭 자동조정회로Rasta width automatic adjustment circuit of TV

제1도는 종래의 회로도.1 is a conventional circuit diagram.

제2도는 본 고안의 회로도.2 is a circuit diagram of the present invention.

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

A : 브라이트(Bright)회로 B : 안정화 전원회로A: Bright circuit B: Stabilized power supply circuit

C : 상기 안정화 전원회로 (B)의 출력제어회로C: output control circuit of the stabilized power supply circuit (B)

본 고안은 TV의 라스타폭 조정회로에 있어서 브라이트 회로의 콘트롤신호를 궤환시켜 안정화 전원회로에서 얻어지는 일정한 전압을 자동으로 가변되게 하므로서 라스타폭의 안정을 유지하면서도 여기서 소모되는 전력을 줄이기 위한 라스타폭 자동조정회로에 관한 것이다.The present invention is designed to reduce the power consumed here while maintaining the stability of the raster width by automatically varying the constant voltage obtained from the stabilized power supply circuit by feeding back the control signal of the bright circuit in the raster width adjusting circuit of the TV. It relates to a width automatic adjustment circuit.

일반적으로, TV에 있어서 영상이 밝아지면 부하가 커지고, 이는 라스타폭에 지배적으로 관계되는 FBT(수평출력 변압기)의 특성(부하가 커지면 고압이 떨어짐)에 의해 라스타폭이 커지게 된다. 그래서 종래에는 이를 보상하기 위해 제1도와 같이 안정화 전원장치의 출력단에 부하와 직렬로, 강압용 저항(RL)을 연결하여 브라이트가 강할 경우 편향코일에 흐르는 전류를 감소시키므로서 라스타폭의 안정을 유지할 수는 있다하겠으나, 이러한 경우 저항(RL)에 흐르는 대전류에 의하여 전력손실이 불가피한 문제점이 대두된다.In general, when a picture is bright in TV, the load is increased, and the rasta width is increased by the characteristics of the horizontal output transformer (FBT) that is dominantly related to the rasta width (high pressure drops when the load is increased). Therefore, in order to compensate for this, the raster width is stabilized by reducing the current flowing in the deflection coil when the bright is strong by connecting the step-down resistor R L to the output terminal of the stabilizing power supply as shown in FIG. It can be maintained, but in this case, a problem in which power loss is inevitable due to the large current flowing through the resistor R L arises.

본 고안은 이러한 문제점을 해소시키고자 안출된 것으로 이를 상세히 설명하면 다음과 같다.The present invention has been devised to solve this problem, which will be described in detail as follows.

즉, 안정화 전원회로(B)의 출력단에 트랜지스터(Q3)를 연결하되, 이 트랜지스터(Q3)의 베이스에는 브라아트 회로(A)에서 비임전류가 흐를 경우에 나타나는 C점 전압을 적절히 궤환 바이어스될 수 있도록한 분압 저항(R3)(R4)을 연결하고, 콜렉터에는 저항(R2)을 접속시켜 상기 안정화 전원회로(B)의 출력단저항(RA)의 일단에 연결하며, 에미터측은 상기 저항(RA)의 타단에 연결하여서 구성된 것이다.That is, the transistor Q 3 is connected to the output terminal of the stabilizing power supply circuit B, and the base point of the transistor Q 3 is appropriately feedback biased to the point C voltage generated when the beam current flows in the braat circuit A. Connect the voltage divider (R 3 ) (R 4 ) so as to be possible, and connect the resistor (R 2 ) to the collector and to one end of the output terminal resistance (R A ) of the stabilized power supply circuit (B), and the emitter The side is configured by connecting to the other end of the resistor (R A ).

이러한 구성에 따른 본 고안의 동작상태를 설명하면, 비임전류가 많이 흐를 경우에는 저항(R1)의 전위가 높아지는데, 이는 저항(R3)(R4)으로 분압되어 트랜지스터(Q3)의 베이스에 공급되므로 비임전류가 어느정도 이상 흐를 경우에는 트랜지스터(Q3)가 동작하게 되어 저항(RA)과 저항(R2), 트랜지스터(Q3)가 병렬상태로 되는 관계로 안정화 전원회로(B)의 출력단 저항(RA)을 감소시키게 되므로 저항(RL)으로 인한 전압강하는 감소한다. 따라서, 저항(RL)에 흐르는 큰 전류에 의한 전력손실을 감소시킬수 있게 되는 것이다.Referring to the operation state of the present invention according to this configuration, when a lot of the beam current flows, the potential of the resistor (R 1 ) is increased, which is divided by the resistor (R 3 ) (R 4 ) to the transistor Q 3 Since it is supplied to the base, when the beam current flows to a certain degree, the transistor Q 3 is operated so that the resistor R A , the resistor R 2 , and the transistor Q 3 are in parallel, so that the stabilized power supply circuit B Since the output terminal resistance (R A ) of) decreases, the voltage drop caused by the resistor (R L ) decreases. Therefore, the power loss due to the large current flowing through the resistor R L can be reduced.

한편, 라스타폭을 자동 안정시키게되는 동작에 있어서는, 안정화 전원회로(B)의 출력전압, 즉, a점의 전압을 Va,b점의 전압을 Vb라 하면, Vb=Vz(제너전압)+VBE(트랜지스터(Q2)의(베이스와 에미터간 전압)=이므로(Vz+VBE)로 되며 Va의 상승은 FBT의 고압을 상승시키고, 라스타폭을 넓히게 되며 Va의 감소는 편향코일의 전류를 떨어뜨려 라스타폭을 좁히는 관계로 상기식에서 알수 있듯이 (RA)의 감소는 Va의 전압을 감소시키므로 화면이 밝아질 경우에 커지는 라스타폭을 줄임으로서 화면의 밝기가 수시로 변동하더라도 일정한 라스타폭을 유지하게 되는 것이다.On the other hand, in the operation of automatically stabilizing the rasta width, if the output voltage of the stabilization power supply circuit B, that is, the voltage at point a and the voltage at Va and b is Vb, Vb = Vz (Zener voltage) + V BE (the voltage between base and emitter) of transistor (Q 2 ) = Because of And to (Vz + V BE) increase of Va is as raise the high pressure of the FBT, broaden the Rasta width decreases in Va will know the relation referred to drop the current in deflection coil narrow the star width formula (R A Reduction of) reduces the voltage of Va so that the raster width increases when the screen becomes bright, so that the raster width is maintained even if the brightness of the screen changes frequently.

이와같은 본 고안은 라스타폭을 일정하게 자동으로 유지하면서도 전력손실을 줄일수 있으므로 경제적인 잇점 또는 지닌 것이라 하겠다.The present invention can be said to have economic advantages or power loss because it can reduce power loss while maintaining the rasta width automatically.

Claims (1)

통상의 안정화 전원회로 (B)에 브라이트 회로(A)를 연결한 것에 있어서 브라이트 회로(A)의 전압을 검출하기 위한 분압저항(R3)(R4)과 이로써 검출된 전압의 크기에 따라 스위칭 동작하는 반도체 스위칭 소자(Q3)와 상기 스위칭 소자(Q3)의 동작에 따라 상기 안정화 전원회로(B)의 출력이 제어되도록 저항(R2)을 연결하여 구성함을 특징으로 하는 텔레비젼의 라스타폭 자동조정회로.In the conventional stabilized power supply circuit (B) being connected with the Bright circuit (A) divided for detecting the voltage of the bright circuit (A) resistance (R 3) (R 4) and thus the switching according to the magnitude of the detected voltage The semiconductor switching element Q 3 and the resistor R 2 are connected to each other so that the output of the stabilizing power supply circuit B is controlled according to the operation of the switching element Q 3 . Star width automatic adjustment circuit.
KR2019820007316U 1982-09-16 1982-09-16 Raster adjestment circuit KR850000159Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019820007316U KR850000159Y1 (en) 1982-09-16 1982-09-16 Raster adjestment circuit

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Application Number Priority Date Filing Date Title
KR2019820007316U KR850000159Y1 (en) 1982-09-16 1982-09-16 Raster adjestment circuit

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KR840001817U KR840001817U (en) 1984-05-17
KR850000159Y1 true KR850000159Y1 (en) 1985-02-13

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