KR980006755A - Undervoltage protection circuit - Google Patents

Undervoltage protection circuit Download PDF

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Publication number
KR980006755A
KR980006755A KR1019960026070A KR19960026070A KR980006755A KR 980006755 A KR980006755 A KR 980006755A KR 1019960026070 A KR1019960026070 A KR 1019960026070A KR 19960026070 A KR19960026070 A KR 19960026070A KR 980006755 A KR980006755 A KR 980006755A
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KR
South Korea
Prior art keywords
voltage
unit
driving
oscillation
resistors
Prior art date
Application number
KR1019960026070A
Other languages
Korean (ko)
Other versions
KR100202080B1 (en
Inventor
김광수
Original Assignee
김광호
삼성전자주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 김광호, 삼성전자주식회사 filed Critical 김광호
Priority to KR1019960026070A priority Critical patent/KR100202080B1/en
Publication of KR980006755A publication Critical patent/KR980006755A/en
Application granted granted Critical
Publication of KR100202080B1 publication Critical patent/KR100202080B1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

본 발명은 저전압 보호 회로에 관한 것으로서, 압력되는 교류전압을 정류하는 정류부와, 상기 브리지 다이오드에서 전류된 전압을 평활하는 콘덴서와, 발진부의 입력단자에 발진부가 구동하기 적합한 전압을 인가하는 복수개의 저항과, 상기 저항에서 인가하는 전압에 의해 일정 주파수의 펄스를 출력하는 발진부와, 상기 발진부에서 출력되는 펄스에 의해 연속적인 온 오프 동작을 수행함으로써, 트랜스포머를 구동하는 트랜지스터와, 2차단의 피드백 전압을 감지하는 피드백 전압 감지부와, 2차 단에 과전류가 흐르면 회로를 보호하기 위해 발진부의 구동을 정지시키는 제어부로 구성된 전원 공급 장치에 있어서; 입력 전압에 따라서 전압값이 달라지는 상기 두 저항 사이의 접점의 전압과 피드백 전압 감지부의 발진부 구동을 위한 일정 전압을 이용하여 제어부에 발진부를 구동 또는 정지하기 위한 제어신호를 출력하는 저전압 감지부를 구비한다.The present invention relates to a low-voltage protection circuit, and more particularly, to a low-voltage protection circuit which includes a rectification section for rectifying a rectified voltage, a capacitor for smoothing a voltage applied to the bridge diode, a plurality of resistors for applying a voltage suitable for driving the oscillation section, A transistor for driving a transformer by performing a continuous ON / OFF operation by a pulse outputted from the oscillation unit, and a transistor for driving a transformer by applying a feedback voltage of 2 blocks And a control unit for stopping driving of the oscillation unit to protect the circuit when an overcurrent flows in the second stage, the power supply unit comprising: And a low voltage sensing unit for outputting a control signal for driving or stopping the oscillation unit to the control unit using a voltage of a contact between the two resistors whose voltage value varies according to an input voltage and a constant voltage for driving an oscillation unit of the feedback voltage sensing unit.

Description

저전압 보호 회로Undervoltage protection circuit

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제 1 도는 종래 기술에 따른 전원 공급 장치를 나타낸 회로도.1 is a circuit diagram showing a power supply device according to a prior art; FIG.

제 2 도는 본 발명에 따른 저전압 보호 회로의 일실시예를 나타낸 회로도.FIG. 2 is a circuit diagram showing an embodiment of a low-voltage protection circuit according to the present invention. FIG.

Claims (2)

입력되는 교류전압을 정류하는 정류부와, 상기 브리지 다이오드에서 정류된 전압을 평활하는 콘덴서와, 발진부의 입력단자에 발진부가 구동하기 전압한 전압을 인가하는 복수개의 저항과 상기 저항에서 인가하는 전압에 의해 일정 주파수를 펄스를 출력하는 발진부와, 상기 발진부에서 출력되는 펄스에 의해 연속적인 온 오프동작을 수행함으로써, 트랜스포머를 구동하는 트랜지스터와, 2차단의 피드백 전압을 감지하는 피드백 전압 감지부와, 2차 단에 과전류가 흐르면 회로를 보호하기 위해 발진부의 구동을 정지시키는 제어부로 구성된 전원 공급 장치에 있어서, 입력 전압에 따라서 전압값이 달라지는 상기 두 저항 사이의 접저의 전압과 피드백 전압 감지부의 발진부 구동을 위한 일정 전압을 이용하여 제어부에 발진부를 구동 또는 정지하기 이한 제어신호를 출력하는 저전압 감지부를 구비한 저전압 보호 회로.A capacitor for smoothing the voltage rectified by the bridge diode; a plurality of resistors for applying a voltage to the input terminal of the oscillation unit, the voltage being applied by the oscillation unit; A transistor for driving a transformer by performing a continuous ON / OFF operation by pulses output from the oscillation unit; a feedback voltage sensing unit for sensing a feedback voltage of two interrupts; And a control unit for stopping the driving of the oscillation unit in order to protect the circuit when an overcurrent flows through the switching unit. The power supply unit includes a voltage between the two resistors whose voltage value varies according to an input voltage, In order to drive or stop the oscillating part to the control part using a constant voltage And a low voltage sensing section for outputting a control signal. 제 1 항에 있어서, 상기 저전압 감지부는, 상기 두 저항 사이에 접점에 의해 분배된 전압을 발진부의 구동 전압과 비교하기 적당한 전압값으로 분배하는 제 3 및 제 4 저항과, 상기 제 3 및 제 4 저항 사이의 접점제어노드가 연결된 다이오드와, 베이스는 상기 다이오드의 캐소드에 연결되고, 이미터는 피드백 전압 감지부의 발진부의 구동을 위한 일정전압이 출력되는 접점에 연결되어 있으며, 콜렉터는 저항을 거쳐 제어부에 연결되어 있는 스위칭 작용을 하는 PNP형 트랜지스터로 구성된 것을 특징으로 하는 저전압 보호 회로.The apparatus of claim 1, wherein the low voltage sensing unit comprises: third and fourth resistors for distributing the voltage distributed by the contact between the two resistors to a voltage value suitable for comparing with the driving voltage of the oscillating unit; The base is connected to the cathode of the diode. The emitter is connected to a contact for outputting a constant voltage for driving the oscillation part of the feedback voltage sensing part. The collector is connected to the control part through a resistor, And a PNP transistor having a switching action connected thereto.
KR1019960026070A 1996-06-29 1996-06-29 A protecting circuit for low-voltage KR100202080B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960026070A KR100202080B1 (en) 1996-06-29 1996-06-29 A protecting circuit for low-voltage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960026070A KR100202080B1 (en) 1996-06-29 1996-06-29 A protecting circuit for low-voltage

Publications (2)

Publication Number Publication Date
KR980006755A true KR980006755A (en) 1998-03-30
KR100202080B1 KR100202080B1 (en) 1999-06-15

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Application Number Title Priority Date Filing Date
KR1019960026070A KR100202080B1 (en) 1996-06-29 1996-06-29 A protecting circuit for low-voltage

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100453849B1 (en) * 2002-04-27 2004-10-28 주식회사 동진아이엔피 Apparatus for protection of SMPS

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000038016A (en) * 1998-12-03 2000-07-05 윤종용 Controlling device of power source supplying device
KR101243346B1 (en) * 2011-07-22 2013-03-13 엘아이지넥스원 주식회사 Dc-dc converter control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100453849B1 (en) * 2002-04-27 2004-10-28 주식회사 동진아이엔피 Apparatus for protection of SMPS

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