KR960012931A - Horizontal output transistor protection device in case of overvoltage - Google Patents

Horizontal output transistor protection device in case of overvoltage Download PDF

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Publication number
KR960012931A
KR960012931A KR1019940024656A KR19940024656A KR960012931A KR 960012931 A KR960012931 A KR 960012931A KR 1019940024656 A KR1019940024656 A KR 1019940024656A KR 19940024656 A KR19940024656 A KR 19940024656A KR 960012931 A KR960012931 A KR 960012931A
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KR
South Korea
Prior art keywords
power
overvoltage
power supply
output transistor
rectifying
Prior art date
Application number
KR1019940024656A
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Korean (ko)
Other versions
KR0136032B1 (en
Inventor
이성로
Original Assignee
배순훈
대우전자 주식회사
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Priority to KR1019940024656A priority Critical patent/KR0136032B1/en
Publication of KR960012931A publication Critical patent/KR960012931A/en
Application granted granted Critical
Publication of KR0136032B1 publication Critical patent/KR0136032B1/en

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Classifications

    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/10—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess voltage, e.g. for lightning protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/12—Passive devices, e.g. 2 terminal devices
    • H01L2924/1203—Rectifying Diode
    • H01L2924/12035—Zener diode

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
  • Protection Of Static Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

본 발명은 텔레비전의 전원회로에서 과전압이 발생되어 플라이백트랜스포머에 인가되게 되면 수평출력트랜지스터의 콜렉터측에 가해지는 콜렉터전압이 상승됨에 따라 그 수평출력트랜지스터에 과부하가 발생되어 수상관 애노우드에 과잉 상승된 수상관 애노우드전압이 인가됨에 따라 수상관하면으로부터 인체에 유해한 대량의 X-선이 방출될수 있게 된다는 사정을 감안하여 이루어진 것으로, 텔레비전의 전원회로를 통해 플라이백트랜스에 인가되는 전원전압이 과전압 상태인 것으로 검출되면 그 과전압으로 인해 수평출력트랜지스터에 과부하가 발생되는 것을 방지하기 위해 SMPS회로부의 입력전원을 차단하도록 된 과전압시 수평출력 트랜지스터보호장치를 제공한다.According to the present invention, when an overvoltage is generated in a power supply circuit of a television and applied to a flyback transformer, the collector voltage applied to the collector side of the horizontal output transistor is increased so that the horizontal output transistor is overloaded, causing excessive rise in the water pipe anode. This is made in consideration of the fact that a large amount of X-rays harmful to the human body can be emitted from the lower surface of the receiving tube as the anode voltage is applied.The power supply voltage applied to the flyback transformer through the power circuit of the television is overvoltage. When it is detected that the state is detected to provide a horizontal output transistor protection device for the overvoltage to cut off the input power of the SMPS circuit part to prevent the overvoltage on the horizontal output transistor due to the overvoltage.

그에따라 본 발명은 상용 교류전원을 변압하기 위한 전원 트랜스(20)와, 상기 변압된 교류전원을 직류전원으로 정류하는 정류회로(21), 상기 직류전원을 감압하여 스텐바이전원으로서 인가하는 전원레귤레이터(22), 상용 교류전원을 정류하는 정류회로(23)를 통한 직류전원을 동작전원으로서 플라이백트랜스측에 공급하는 SMPS회로부(24)를 구비한 텔레비전의 전원공급장치에 있어서, 상기 SMPS회로부 (24)를 통한 동작전원의 과전압상태를 검출하기위한 과전압검출부(25)와, 상기 스텐바이전원을 공급받고서 상기 과전압검출부(25)의 과전압검출상태를 인식한 결과로 상기 SMPS회로부(24)를 통한 공급전원을 차단하기 위한 제어신호를 출력하는 마이컴(26)및, 상기 마이컴(26)으로 부터의 제어신호를 입력받아 상기 SMPS회로부 (24)에 인가되는 직류전원을 차단하기 위해 스위칭 동작되는 스위칭수단(27)을 더 구비하여 구성되는 것을 특징으로 한다.Accordingly, the present invention provides a power transformer 20 for transforming commercial AC power, a rectifier circuit 21 for rectifying the transformed AC power as a DC power supply, and a power regulator for reducing the DC power and applying it as a standby power supply. (22), a power supply for a television having an SMPS circuit portion (24) for supplying a DC power supply through a rectifying circuit (23) for rectifying commercial AC power to a flyback transformer side as an operating power source, wherein the SMPS circuit portion ( 24 through the SMPS circuit unit 24 as a result of recognizing an overvoltage detection state of the overvoltage detection unit 25 by receiving the overvoltage detection unit 25 and the standby power supply. To cut off the DC power applied to the SMPS circuit unit 24 by receiving the microcomputer 26 and the control signal from the microcomputer 26 to output a control signal for shutting off the power supply. Characterized in that the configuration further comprising a switching means (27) by switching operation.

Description

과전압시 수평출력트랜지스터 보호장치Horizontal output transistor protection device in case of overvoltage

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

제1도는 일반적인 수평출력회로부의 회로구성을 나타낸 도면.1 is a diagram showing a circuit configuration of a general horizontal output circuit.

제2도는 본 발명에 따른 과전압시 수평출력트랜지스터 보호장치가 채용된 텔레비전의 전원회로부를 나타낸 도면이다.2 is a diagram showing a power supply circuit portion of a television employing a horizontal output transistor protection device during overvoltage according to the present invention.

Claims (2)

상용 교류전원을 변압하기 위한 전원트랜스(20)와, 상기 교류전원을 직류전원으로 정류하는 정류회로(21), 상기 직류전원을 감압하여 스텐바이 전원으로서 인가하는 전원레귤레이터(22), 상용교류전원을 정류하는 정류회로(23)를 통한 직류전원을 동작전원으로서 플라이백트랜스측에 공급하는 SMPS회로부(24)를 구비한 텔레비전의 전원공급장치에 있어서, 상기 SMPS회로부(24)를 통한 동작전원의 과전압상태를 검출하기 위한 과전압검출부(25)와, 상기 스텐바이전원을 공급받고서 상기 과전압검출부(25)의 과전압검출 상태를 인식한 결과로 상기 SMPS회로부(24)를 통한 공급전원을 차단하기 위한 제어신호를 출력하는 마이컴(26)및, 상기 마이컴(26)으로 부터의 제어신호를 입력받아 상기 SMPS회로부(24)에 인가되는 직류전원을 차단하기 위해 스위칭 동작되는 스위칭수단(27)을 더 구비하여 구성되는 것을 특징으로 하는 과전압시 수평출력트랜지스터 보호장치A power transformer 20 for transforming commercial AC power, a rectifier circuit 21 for rectifying the AC power as a DC power source, a power regulator 22 for reducing the DC power and applying it as a standby power source, and a commercial AC power source. A power supply apparatus for a television having an SMPS circuit portion 24 for supplying a DC power supply through a rectifying circuit 23 for rectifying the voltage to a flyback transformer side as an operating power supply. Control to cut off the power supply through the SMPS circuit section 24 as a result of recognizing the overvoltage detection state of the overvoltage detection unit 25 and the standby voltage supplied to the standby voltage detection unit 25 for detecting an overvoltage state Switching operation to switch the microcomputer 26 for outputting a signal and the DC power applied to the SMPS circuit unit 24 by receiving the control signal from the microcomputer 26 Horizontal output transistor protection device at the time of overvoltage, characterized in that it further comprises a means (27) 제1항에있어서, 상기 과전압검출부(25)는 상기 공급전원의 인가방향에 대해 역방향으로 접속되고서 그 정격전압레벨을 상회하여 통과하는 과전압을 검출하는 제너다이오드(JD)와, 상기 과전압상태의 공급전원을 정류하는 정류다이오드(D6, D7)및, 상기 정류된 과전압상태의 공급전원을 필터링하기 위한 저항(R5)과 캐패시터(C10, C11)를 포함하여 구성된 것을 특징으로 하는 과전압시 수평출력트랜지스터 보호장치2. The zener diode (JD) according to claim 1, wherein the overvoltage detection unit (25) is connected in a reverse direction with respect to an application direction of the supply power and detects an overvoltage passing through the rated voltage level. Rectifier diodes (D6, D7) for rectifying the supply power, and a resistor (R5) and capacitors (C10, C11) for filtering the supply power in the rectified over-voltage state, the horizontal output transistor during overvoltage Protection ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940024656A 1994-09-29 1994-09-29 Horizontal output transistor protecting apparatus at the approved over-voltage KR0136032B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940024656A KR0136032B1 (en) 1994-09-29 1994-09-29 Horizontal output transistor protecting apparatus at the approved over-voltage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940024656A KR0136032B1 (en) 1994-09-29 1994-09-29 Horizontal output transistor protecting apparatus at the approved over-voltage

Publications (2)

Publication Number Publication Date
KR960012931A true KR960012931A (en) 1996-04-20
KR0136032B1 KR0136032B1 (en) 1998-04-27

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KR1019940024656A KR0136032B1 (en) 1994-09-29 1994-09-29 Horizontal output transistor protecting apparatus at the approved over-voltage

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004084584A1 (en) * 2003-03-18 2004-09-30 Bluetek Co. Ltd. A multi-channel speaker system and a connection system thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010026941A (en) * 1999-09-09 2001-04-06 윤종용 A X-ray protection circuit in a display system
KR100534114B1 (en) * 2003-07-03 2005-12-08 삼성전자주식회사 CRT display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004084584A1 (en) * 2003-03-18 2004-09-30 Bluetek Co. Ltd. A multi-channel speaker system and a connection system thereof

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KR0136032B1 (en) 1998-04-27

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