KR960003012A - Low voltage protection circuit of power supply - Google Patents

Low voltage protection circuit of power supply Download PDF

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Publication number
KR960003012A
KR960003012A KR1019940014287A KR19940014287A KR960003012A KR 960003012 A KR960003012 A KR 960003012A KR 1019940014287 A KR1019940014287 A KR 1019940014287A KR 19940014287 A KR19940014287 A KR 19940014287A KR 960003012 A KR960003012 A KR 960003012A
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KR
South Korea
Prior art keywords
voltage
power supply
transformer
input voltage
secondary side
Prior art date
Application number
KR1019940014287A
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Korean (ko)
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KR0147219B1 (en
Inventor
조인행
Original Assignee
이헌조
엘지전자 주식회사
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Priority to KR1019940014287A priority Critical patent/KR0147219B1/en
Publication of KR960003012A publication Critical patent/KR960003012A/en
Application granted granted Critical
Publication of KR0147219B1 publication Critical patent/KR0147219B1/en

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Classifications

    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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

Abstract

본 발명은 전원전압이 일정전압이하로 떨어졌을 경우 자동으로 부하구동을 방지하도록 한 전원공급장치의 저전압 보호회로에 관한 것이다.The present invention relates to a low voltage protection circuit of a power supply device that automatically prevents load driving when a power supply voltage drops below a predetermined voltage.

종래의 경우 전원전압이 현저히 떨어지게 되어도 회로는 스위칭동작을 계속하게 되어 트랜스의 2차측으로 혹은 부하쪽으로 전원이 인가되게 되고 제품은 제기능을 발휘하지 못하는데도 회로는 동작을 하게되어 부하 및 제어기기가 손상될 우려가 있었다.In the conventional case, the circuit continues the switching operation even when the power supply voltage drops considerably, and the power is applied to the secondary side of the transformer or to the load side, and the circuit operates even though the product does not function properly. There was a risk of damage.

따라서 본 발명은 전원전압을 정류하는 다이오드 모듈과,전원전압의 2차측 유기를 위한 트랜스 및 기동저항을 갖는 스위칭용 트랜지스터,상기 트랜스의 2차측 출력전압을 안정화시켜주기 위해 제너 다이오드 및 콘덴서,상기 트랜스의 2차측 전압을 정류 및 평활하는 다이오드 및 콘덴서를 구비하는 전원공급장치에 있어서,입력전압의 변동을 감지하는 입력전압 감지부와,상기 입력전압 감지부의 입력전압 감지결과 일정전압 이하일경우 상기 트랜지스터가 턴오프되도록 하는 스위칭 제어부를 더 구비하여 입력전압이 일정전압 이하로 내려가게 되면 SMPS의 스위칭동작을 차단시켜줌으로써 저전압에서 부하나 트랜스의 2차측으로 공급되는 전압을 차단시켜 기기를 보호할 수 있도록 한 것이다.Accordingly, the present invention provides a diode module for rectifying a power supply voltage, a switching transistor having a transformer and a starting resistance for secondary side induction of the power supply voltage, a zener diode and a capacitor to stabilize the output voltage of the secondary side of the transformer, the transformer A power supply comprising a diode and a capacitor for rectifying and smoothing a secondary side voltage of the power supply, comprising: an input voltage detector configured to detect a change in an input voltage, and the transistor is less than a predetermined voltage as a result of the input voltage detection of the input voltage detector; It is further provided with a switching control unit to turn off so that when the input voltage falls below a certain voltage, it blocks the switching operation of the SMPS so that the device can be protected by cutting off the voltage supplied to the secondary side of the load or transformer at low voltage. will be.

Description

전원공급장치의 저전압 보호회로Low voltage protection circuit of power supply

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

제2도는 본 발명에 따른 전원공급장치의 저전압 보호회로도.2 is a low voltage protection circuit diagram of a power supply according to the present invention.

Claims (3)

전원전압을 정류하는 다이오드 모듈과,전원전압의 2차측 유기를 위한 트랜스와,상기 다이오드 모듈에 연결된 베이스 기동저항을 갖는 스위칭용 트랜지스터와,상기 트랜스의 2차측의 출력전압을 안정화시켜주기위한 제너 다이오드 및 콘덴서,상기 트랜스의 2차측 전압을 정류 및 평활하는 다이오드 및 콘덴서를 구비하는 전원공급장치에 있어서,상기 다이오드 모듈에 연결되어 입력전압의 변동을 감지하는 입력전압 감지부와 상기 입력전압 감지부의 입력전압 감지결과에 따라 상기 스위칭용 트랜지스터의 스위칭을 제어하는 스위칭 제어부가 더 구비되어 구성됨을 특징으로 하는 전원공급장치의 저전압 보호회로.A diode module for rectifying the power supply voltage, a transformer for inducing a secondary side of the power supply voltage, a switching transistor having a base starting resistance connected to the diode module, and a zener diode for stabilizing an output voltage of the secondary side of the transformer And a condenser and a diode and a condenser rectifying and smoothing the secondary voltage of the transformer, the power supply comprising: an input voltage sensing unit connected to the diode module to sense a change in an input voltage and an input of the input voltage sensing unit And a switching control unit for controlling the switching of the switching transistor according to the voltage sensing result. 제1항에 있어서,상기 입력전압 감지부는 상기 다이오드 모듈에 연결된 2개의 제1비교저항과,상기 다이오드 모듈 및 트랜스의 2차측 다이오드 및 콘덴서에 연결된 2개의 제2비교저항,상기 제1비교저항 사이에 비반전 입력단이 연결되고 상기 제2비교저항 사이에 반전 입력단이 연결되어 입력전압이 일정전압 이하일 경우 출력이 로우가 되는 비교기로 구성됨을 특징으로 하는 전원공급장치의 저전압 보호회로.The display device of claim 1, wherein the input voltage sensing unit comprises two first comparison resistors connected to the diode module, two second comparison resistors connected to the secondary diode and the capacitor of the diode module and the transformer, and the first comparison resistor. A low voltage protection circuit of a power supply, characterized in that the non-inverting input terminal is connected to the inverting input terminal is connected between the second comparative resistor and the output is low when the input voltage is below a certain voltage. 제1항에 있어서,상기 스위칭 제어부는 상기 비교기의 출력측에 연결된 저항과,상기 저항에 베이스측이 연결되고 에미터측은 상기 스위치용 트랜지스터의 베이스에 연결되며 콜렉터측은 상기 트랜지스터의 베이스저항에 연결되어 상기 비교기의 출력이 하이일 경우 턴온되는 스위치용 트랜지스터로 구성됨을 특징으로 하는 전원공급장치의 저전압 보호회로.The switching controller of claim 1, wherein the switching controller includes a resistor connected to an output side of the comparator, a base side connected to the resistor, an emitter side connected to a base of the switching transistor, and a collector side connected to a base resistance of the transistor. A low voltage protection circuit of a power supply, characterized in that consisting of a switching transistor that is turned on when the output of the comparator is high. ※ 참고사항: 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the original application.
KR1019940014287A 1994-06-22 1994-06-22 Low voltage protection circuit of power supply system KR0147219B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940014287A KR0147219B1 (en) 1994-06-22 1994-06-22 Low voltage protection circuit of power supply system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940014287A KR0147219B1 (en) 1994-06-22 1994-06-22 Low voltage protection circuit of power supply system

Publications (2)

Publication Number Publication Date
KR960003012A true KR960003012A (en) 1996-01-26
KR0147219B1 KR0147219B1 (en) 1998-10-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019940014287A KR0147219B1 (en) 1994-06-22 1994-06-22 Low voltage protection circuit of power supply system

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KR0147219B1 (en) 1998-10-01

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