KR970031140A - Overcurrent Protection for Switching Mode Power Supplies - Google Patents

Overcurrent Protection for Switching Mode Power Supplies Download PDF

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Publication number
KR970031140A
KR970031140A KR1019950046630A KR19950046630A KR970031140A KR 970031140 A KR970031140 A KR 970031140A KR 1019950046630 A KR1019950046630 A KR 1019950046630A KR 19950046630 A KR19950046630 A KR 19950046630A KR 970031140 A KR970031140 A KR 970031140A
Authority
KR
South Korea
Prior art keywords
switching
overcurrent protection
pwm
mode power
switching mode
Prior art date
Application number
KR1019950046630A
Other languages
Korean (ko)
Other versions
KR0171712B1 (en
Inventor
이수길
Original Assignee
이형도
삼성전기 주식회사
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.)
Filing date
Publication date
Application filed by 이형도, 삼성전기 주식회사 filed Critical 이형도
Priority to KR1019950046630A priority Critical patent/KR0171712B1/en
Publication of KR970031140A publication Critical patent/KR970031140A/en
Application granted granted Critical
Publication of KR0171712B1 publication Critical patent/KR0171712B1/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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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

이 발명은 입력 전압 변동 및 잡음에 무관하게 과전류 보호 동작하는 스위칭 모드 전원공급장치의 과전류 보호장치에 관한 것으로서, 종래의 기술에 있어서는 트랜스(T1)의 1차측에서 전류를 검출하여 과전류 보호에 이용하기 때문에 입력 전압의 변동에 따라 과전류 보호를 위한 과전류 포인트가 연동되며, 스위칭 잡음에 따른 오동작이 발생하기도 하는 결점이 있었으나, 이 발명에서는 히스테리 특성에 의해 잡음에 따른 오동작이 없으며, 입력 전압의 변동에 따른 과전류 보호 포인트가 변하지 않으므로 상기 결점을 개선시킬 수 있는 것이다.The present invention relates to an overcurrent protection device of a switching mode power supply that operates overcurrent protection regardless of input voltage fluctuations and noise. Therefore, there is a drawback that the overcurrent point for overcurrent protection is interlocked according to the variation of the input voltage and there is a malfunction that occurs due to switching noise. Since the overcurrent protection point does not change, the above defect can be improved.

Description

스위칭 모드 전원공급장치의 과전류 보호장치Overcurrent Protection for Switching Mode Power Supplies

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 이 발명에 따른 스위칭 모드 전원공급장치의 과전류 보호장치의 일 실시예를 나타낸 회로도이다.2 is a circuit diagram showing an embodiment of an overcurrent protection device of a switched mode power supply according to the present invention.

Claims (2)

입력 직류를 인가받아 스위칭에 의해 변압시키는 트랜스(T1)와, 스위치용 PWM 신호를 출력하는 PWM IC(20)와; 상기 PWM IC(20)로부터 스위치용 PWM 신호를 인가받아 상기 트랜스(T1)의 1차측을 스위칭시켜 상기 트랜스(T1)가 변압작용하도록 하는 스위칭부(22)와; 상기 입력 직류를 분압하는 전압 분압부(24)와; 상기 전압 분압부(24)의 분압된 직류 및 기설정된 기준 전압을 입력으로 해서 반전 증폭하여 출력하는 제 1 증폭부(26)와; 상기 제 1 증폭부(26)의 출력 및 상기 스위칭부(22)의 스위칭에 따른 전압을 입력으로 해서 비반전 증폭하여 소정의 기간동안 지연 후, 출력하는 제 2 증폭부(28)와; 상기 제2증폭부(28)의 출력과 기설정된 기준 전압을 비교해서 결과를 상기 PWM IC(20)의 DT(Dead Time)단에 인가하여 상기 PWM IC(20)가 과전류에 따라 스위칭용 PWM 신호를 출력하도록 하는 비교부(30)를 포함하여 이루어지는 스위칭 모드 전원공급장치의 과전류 보호장치.A transformer T1 for receiving an input direct current and transforming the switch by switching, and a PWM IC 20 for outputting a PWM signal for switching; A switching unit 22 receiving a PWM signal for switching from the PWM IC 20 to switch the primary side of the transformer T1 to transform the transformer T1; A voltage divider 24 for dividing the input direct current; A first amplifier 26 for inverting and amplifying the divided DC and the predetermined reference voltage of the voltage divider 24 as an input; A second amplifying unit (28) for outputting the first amplifying unit (26) and a voltage according to the switching of the switching unit (22) as an input and performing non-inverting amplification for a predetermined period of time, and then outputting it; The output of the second amplifier 28 is compared with a predetermined reference voltage and the result is applied to the DT (Dead Time) stage of the PWM IC 20 so that the PWM IC 20 switches the PWM signal according to the overcurrent. Overcurrent protection device of a switching mode power supply comprising a comparator 30 to output the. 제1항에 있어서, 상기 비교부(30)는 출력단과 (＋)입력단 사이에 접속된 저항기(R15)에 의해서 히스테리 특성을 갖는 비교기(U3)를 포함하여 이루어지는 것을 특징으로하는 스위칭 모드 전원공급장치의 과전류 보호장치.The switching mode power supply of claim 1, wherein the comparing unit 30 comprises a comparator U3 having hysteresis characteristics by a resistor R15 connected between an output terminal and a positive input terminal. Overcurrent protection device. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950046630A 1995-11-30 1995-11-30 Overcurrent protection apparatus of smps KR0171712B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950046630A KR0171712B1 (en) 1995-11-30 1995-11-30 Overcurrent protection apparatus of smps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950046630A KR0171712B1 (en) 1995-11-30 1995-11-30 Overcurrent protection apparatus of smps

Publications (2)

Publication Number Publication Date
KR970031140A true KR970031140A (en) 1997-06-26
KR0171712B1 KR0171712B1 (en) 1999-05-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019950046630A KR0171712B1 (en) 1995-11-30 1995-11-30 Overcurrent protection apparatus of smps

Country Status (1)

Country Link
KR (1) KR0171712B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100828923B1 (en) * 2001-10-10 2008-05-13 엘지디스플레이 주식회사 Prevention Circuit of Over Voltage and Surge Voltage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020034688A (en) * 2000-11-03 2002-05-09 안우희 Over current detection apparatus for protecting inverter for use in vehicles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100828923B1 (en) * 2001-10-10 2008-05-13 엘지디스플레이 주식회사 Prevention Circuit of Over Voltage and Surge Voltage

Also Published As

Publication number Publication date
KR0171712B1 (en) 1999-05-01

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