KR960012942A - Horizontal output transistor protection circuit - Google Patents

Horizontal output transistor protection circuit Download PDF

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Publication number
KR960012942A
KR960012942A KR1019940024657A KR19940024657A KR960012942A KR 960012942 A KR960012942 A KR 960012942A KR 1019940024657 A KR1019940024657 A KR 1019940024657A KR 19940024657 A KR19940024657 A KR 19940024657A KR 960012942 A KR960012942 A KR 960012942A
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KR
South Korea
Prior art keywords
horizontal
power
horizontal output
circuit section
output transistor
Prior art date
Application number
KR1019940024657A
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Korean (ko)
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KR0136029B1 (en
Inventor
이성로
Original Assignee
배순훈
대우전자 주식회사
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Priority to KR1019940024657A priority Critical patent/KR0136029B1/en
Publication of KR960012942A publication Critical patent/KR960012942A/en
Application granted granted Critical
Publication of KR0136029B1 publication Critical patent/KR0136029B1/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
    • H04N3/19—Arrangements or assemblies in supply circuits for the purpose of withstanding high voltages
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H79/00—Protective switches in which excess current causes the closing of contacts, e.g. for short-circuiting the apparatus to be protected
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2231/00—Applications
    • H01H2231/036—Radio; TV

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

Abstract

본 발명은 수평출력회로부에서 수평출력트랜지스터에 인가되는 수평주파수신호의 동기가 흐트르져 수평동기 신호의 주파수가 높아지게 되면 수평주사기간 중의 이트래이스타임(Retrace time)은 짧아지고 스캐닝타임(Scanning time)이 길어지게 됨에 따라 그 수평출력트랜지스터에 흐르느 전류가 증대되어 그 수평출력트랜지스터가 파괴되기 쉽고, 그에 따라 텔레비전의 화면상에서 래스터가 나타나지 않게 되는 등의 악영향을 주게되는 일이 발생된다는 사정의 감안하여 이루어진 것으로, 그 수평출력트랜지스터에 흐르는 전류가 기준치 이상으로 되면 상용 AC전원을 차단하여 그 수평출력트랜지스터를 과전류로 부터 보호하도록 된 수평출력트랜지스터 보회로를 제공한다.In the present invention, when the horizontal frequency signal applied to the horizontal output transistor in the horizontal output circuit portion is disturbed, the frequency of the horizontal synchronization signal becomes high, the trace time during the horizontal scanning period is shortened, and the scanning time is reduced. As the length increases, the current flowing through the horizontal output transistor increases, which causes the horizontal output transistor to be easily destroyed, thereby adversely affecting the display such that the raster does not appear on the screen of the television. When the current flowing in the horizontal output transistor is higher than the reference value, the commercial AC power supply is cut off to provide the horizontal output transistor complementary circuit to protect the horizontal output transistor from overcurrent.

그에따라 본 발명은, 해당 텔레비전의 수평편향을 실행하는 수평편향회로부 (10) 및 그 수평편향회로부(10)에서 제공되는 수평동기주파수에 의해 스위칭 동작하여 수평출력을 행하는 수평출력트랜지스터(21)를 갖춘 수평출력회로부(20)및 상용 AC전원을 정류하여 상기 수평편향회로부(10)와 상기 수평출력회로부(20)를 포함하는 해당 텔레비전의 동작전원을 공급하는 전원회로부(40)를 포함하여 구성된 텔레비전에 있어서; 상기 수평출력트랜지스터(21)의 출력단의 출력레벨과 소정의 기준주파수에 따른 출력레벨을 비교하는 비교기(54)와, 소정의 기준주파수를 발생함과 더불어 상기 비교기(54)에 의해 상기 수평출력트랜지스터(21)의 과전류상태가 검출되면 상기 상용 AC전원의 차단제어를 행하는 상기 전원회로부(40)의 마이컴 (46)으로 구성되고; 상기 마이컴(46)에의해 상기 전원회로부(40)의 스위칭 트랜지스터(52)가 상용 AC전원의 차단제어에 응답하여 도통상태로 되어 상가 상용 AC전원 경로상에 접점이 형성된 릴레이(53)를 비활성상태로 제어하도록 된 것을 특징으로 한다.Accordingly, the present invention provides a horizontal deflection circuit section 10 which performs horizontal deflection of the television and a horizontal output transistor 21 which performs horizontal output by switching operation by the horizontal synchronizing frequency provided from the horizontal deflection circuit section 10. A television including a horizontal output circuit section 20 and a power circuit section 40 for rectifying commercial AC power to supply operating power of the television including the horizontal deflection circuit section 10 and the horizontal output circuit section 20. To; A comparator 54 for comparing the output level of the output terminal of the horizontal output transistor 21 with an output level according to a predetermined reference frequency, and generating a predetermined reference frequency, and by the comparator 54, the horizontal output transistor. A microcomputer 46 of the power circuit section 40 which performs cutoff control of the commercial AC power when an overcurrent state of (21) is detected; The switching transistor 52 of the power supply circuit unit 40 is brought into a conductive state by the microcomputer 46, thereby deactivating the relay 53 having a contact formed on a commercial AC power path. It characterized in that the control to.

Description

수평출력트랜지스터 보호회로Horizontal output transistor protection circuit

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

제1도는 일반적인 텔레비전의 수평출력회로부를 설명하는 도면.1 is a diagram for explaining a horizontal output circuit section of a general television.

제2도는 제1도에 도시된 수평출력회로부의 동작을 설명하는 파형도.FIG. 2 is a waveform diagram illustrating the operation of the horizontal output circuit portion shown in FIG.

제3도는 본 발명에 따른 수평출력트랜지스터 보호회로가 적용된 텔레비전의 전원회로부를 설명하는 도면이다.3 is a diagram illustrating a power supply circuit unit of a television to which a horizontal output transistor protection circuit according to the present invention is applied.

Claims (2)

해당 탤레비전의 수평편향을 실행하는 수평편향회로부(10)및 그 수평편향회로부(10)에서 제공되는 수평동기주파수에 의해 스위치동작하여 수평출력을 행하는 수평출력트랜지스터(21)를 갖춘 수평출력회로부(20)및 상용 AC전원을 정류하여 상기 수평편향회로부(10)와 상기 수평출력회로부(20)를 포함하는 해당 텔레비전의 동작전원을 공급하는 전원회로부(40)를 포함하여 구성된 텔레비전에 있어서, 상기 수평출력트랜지스터(21)의 출력단의 출력레벨과 소정의 기준주파수에 따른 출력레벨을 비교하는 비교기(54)와, 소정의 기준주파수를 발생함과 더불어 상기비교기(54)에의해 상기 수평출력트랜지스터(21)의 과전류상태가 검출되면 상기 상용 AC전원의 차단제어를 행하는 상기 전원회로부(40)의 마이컴(46)으로 구성되고, 상기 마이컴 (46)에 의해 상기 전원회로부(40)이 스위칭트랜지스터(52)가 상용 AC전원의 차단제어에 응답하여 도통상태로 되어 상기 상용 AC전원 경로상에 접점에 형성된 릴레이 (53)를 비활성상태로 제어하도록 된 것을 특징으로 하는 수평출력트랜지스터 보호회로.A horizontal output circuit section having a horizontal deflection circuit section 10 for performing horizontal deflection of the television and a horizontal output transistor 21 for switching horizontally by a horizontal synchronous frequency provided from the horizontal deflection circuit section 10 to perform horizontal output ( And a power circuit section 40 for rectifying commercial AC power to supply operating power for the television including the horizontal deflection circuit section 10 and the horizontal output circuit section 20. Comparator 54 for comparing the output level of the output terminal of the output transistor 21 and the output level according to a predetermined reference frequency, and generates a predetermined reference frequency, and the horizontal output transistor 21 by the comparator 54 When the over-current state is detected, it is composed of the microcomputer 46 of the power circuit unit 40 which performs the blocking control of the commercial AC power, and the microcomputer 46 makes the power circuit (40) the switching transistor 52 is brought into a conductive state in response to cutoff control of the commercial AC power source, so that the horizontal output of the relay 53 formed at the contact point on the commercial AC power path is in an inactive state. Transistor protection circuit. 제1항에 있어서, 상기 마이컴(46)은 15.734㎑의 수평주파수를 발생하기 위한 수정발진기(46A)와, 상기 수평주파수를 분주하기 위한 분주기(46B)를 포함하여 구성된 것을 특징으로 하는 수평출력트랜지스터 보호회로.2. The horizontal output of claim 1, wherein the microcomputer 46 includes a crystal oscillator 46A for generating a horizontal frequency of 15.734 kHz and a divider 46B for dividing the horizontal frequency. Transistor protection circuit. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940024657A 1994-09-29 1994-09-29 Horizontal output transistor protecting circuit KR0136029B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940024657A KR0136029B1 (en) 1994-09-29 1994-09-29 Horizontal output transistor protecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940024657A KR0136029B1 (en) 1994-09-29 1994-09-29 Horizontal output transistor protecting circuit

Publications (2)

Publication Number Publication Date
KR960012942A true KR960012942A (en) 1996-04-20
KR0136029B1 KR0136029B1 (en) 1998-04-27

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ID=19393870

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019940024657A KR0136029B1 (en) 1994-09-29 1994-09-29 Horizontal output transistor protecting circuit

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Publication number Publication date
KR0136029B1 (en) 1998-04-27

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