KR20010019944A - Circuit for protecting short of DC-DC converter - Google Patents

Circuit for protecting short of DC-DC converter Download PDF

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Publication number
KR20010019944A
KR20010019944A KR1019990036622A KR19990036622A KR20010019944A KR 20010019944 A KR20010019944 A KR 20010019944A KR 1019990036622 A KR1019990036622 A KR 1019990036622A KR 19990036622 A KR19990036622 A KR 19990036622A KR 20010019944 A KR20010019944 A KR 20010019944A
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KR
South Korea
Prior art keywords
converter
diode
protection circuit
short
output terminal
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KR1019990036622A
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Korean (ko)
Inventor
김상민
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김종수
엘지이노텍 주식회사
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Priority to KR1019990036622A priority Critical patent/KR20010019944A/en
Publication of KR20010019944A publication Critical patent/KR20010019944A/en

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    • 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
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to mechanical injury, e.g. rupture of line, breakage of earth connection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • 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
    • H02H3/08—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 current

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

Abstract

PURPOSE: A short protection circuit for DC-DC converter is provided to simplify circuit configuration by using diode and resistance. CONSTITUTION: A short protection circuit(100) comprises a diode(D1) connected in parallel between an output port having relatively lower output voltage and an output port having relatively higher output voltage and which applies current to the output port having relatively higher voltage; and a resistances(Rc) connected between the cathode of the diode and the output port having relatively higher output voltage so as to control the size of the current being applied through the diode. When a short occurs in a DC-DC converter, the current from the output port having relatively lower output voltage is fed to the output port having higher output voltage, through the diode and the resistance, thus driving the short protection circuit for the DC-DC converter.

Description

디씨-디씨 컨버터의 쇼트 보호 회로{Circuit for protecting short of DC-DC converter}Circuit for protecting short of DC-DC converter

본 발명은 디씨-디씨(DC-DC) 컨버터의 쇼트 보호 회로에 관한 것으로, 더욱 상세하게는 여러개의 출력단을 가지는 DC-DC 컨버터에서 쇼트가 발생되면 각 출력단으로 인가되는 전류를 DC-DC 컨버터 내의 쇼트 보호 회로로 인가시켜 회로를 보호하는 DC-DC 컨버터의 쇼트 보호 회로에 관한 것이다.The present invention relates to a short protection circuit of a DC-DC converter. More particularly, when a short occurs in a DC-DC converter having multiple output stages, a current applied to each output stage is transferred into the DC-DC converter. The present invention relates to a short protection circuit of a DC-DC converter applied to a short protection circuit to protect the circuit.

일반적으로 DC-DC 컨버터는 직류를 일단 교류로 변환한 다음, 변압기로 승압 또는 강압하여 정류함으로써 직류 전압의 변압시키는 장치를 말한다.In general, a DC-DC converter refers to a device for converting a DC voltage by converting a direct current into an alternating current, and then rectifying by stepping up or down a transformer.

이러한 DC-DC 컨버터에는 DC-DC 컨버터의 쇼트시 회로를 보호하기 위한 출력단의 전류로 동작되는 쇼트 보호 회로가 칩 내에 내장되어 있으나 쇼트 발생시 출력단의 전류가 부족하여 쇼트 보호 동작을 하지 못하였다.In the DC-DC converter, a short protection circuit operated by the current of the output stage to protect the circuit during the short circuit of the DC-DC converter is embedded in the chip, but the short protection operation was not performed because the current of the output stage was insufficient.

그리하여, DC-DC 컨버터의 출력단에 도 1에 도시된 바와 같은 쇼트 보호 회로가 부가적으로 설치된다.Thus, a short protection circuit as shown in Fig. 1 is additionally installed at the output terminal of the DC-DC converter.

이러한 쇼트 보호 회로(10)는 DC-DC 컨버터의 +20V 정류 전원단과 +20V 출력단 사이에 연결되어 스위칭되는 PNP 트랜지스터(TR1)와, PNP 트랜지스터(TR1)로 인가되는 전압을 조절하는 저항(R1, R2)으로 구성된다.The short protection circuit 10 includes a PNP transistor TR1 connected and switched between a + 20V rectified power supply terminal and a + 20V output terminal of a DC-DC converter, and a resistor R1 for adjusting a voltage applied to the PNP transistor TR1. R2).

쇼트 보호 회로(10)가 구비되는 이유는 PWM IC에 쇼트 보호 회로가 구비되어 있음에도 불구하고 출력단의 전류가 부족하여 정확한 쇼트 보호 동작을 수행하지 않아 상기와 같이 PNP 트랜지스터(TR1)와 저항(R1, R2)으로 쇼트 보호 동작을 가능케 한다.The reason that the short protection circuit 10 is provided is that although the short protection circuit is provided in the PWM IC, the current of the output terminal is insufficient to perform an accurate short protection operation. Thus, the PNP transistor TR1 and the resistor R1, R2) enables short protection operation.

먼저, DC-DC 컨버터가 단락되면 +20V 정류 전원이 Vcc 전압인 +15V로 떨어지게 되고, 이로 인하여 PNP 트랜지스터(TR1)의 베이스와 에미터 간의 전압이 동전위가 되어 PNP 트랜지스터(TR1)가 턴오프되어 회로를 보호하였다. 여기서, PNP 트랜지스터(TR1)는 +20V의 전류 경료를 차단하는 스위치의 역할을 담당한다.First, when the DC-DC converter is shorted, the + 20V rectified power drops to + 15V, which is the Vcc voltage. As a result, the voltage between the base and emitter of the PNP transistor TR1 becomes coincidence and the PNP transistor TR1 is turned off. To protect the circuit. Here, the PNP transistor TR1 serves as a switch to block the current charge of + 20V.

그러나, 이러한 종래의 쇼트 보호 회로는 트랜지스터와, 저항으로 구성되므로 회로 추가시 회로가 복잡해지고, DC-DC 컨버터에 내장된 쇼트 보호 회로를 효율적으로 사용하지 못하는 문제점이 있었다.However, since the conventional short protection circuit is composed of a transistor and a resistor, the circuit becomes complicated when the circuit is added, and there is a problem in that the short protection circuit built in the DC-DC converter cannot be efficiently used.

따라서, 상기와 같은 문제점을 해결하기 위한 본 발명의 목적은 쇼트 보호 회로를 다이오드와 저항만을 이용하여 단순하게 구성하므로 회로가 단순해지도록 하며, DC-DC 컨버터 내에 내장된 쇼트 보호 회로를 효율적으로 사용하도록 하는 데 있다.Accordingly, an object of the present invention for solving the above problems is to simply configure the short protection circuit using only a diode and a resistor to simplify the circuit, and efficiently use the short protection circuit built in the DC-DC converter. It's about doing it.

도 1은 일반적인 종래의 DC-DC 컨버터의 쇼트 보호 회로를 나타낸 회로도1 is a circuit diagram showing a short protection circuit of a conventional conventional DC-DC converter

도 2는 본 발명에 따른 DC-DC 컨버터의 쇼트 보호 회로를 나타낸 블록 회로도2 is a block circuit diagram illustrating a short protection circuit of a DC-DC converter according to the present invention.

<도면중 주요부분에 대한 부호의 설명＞<Explanation of symbols for main parts of drawing>

10, 100 : 쇼트 보호 회로 TR1 : PNP트랜지스터10, 100: short protection circuit TR1: PNP transistor

R1, R2, Rc : 저항 D1: 다이오드R1, R2, Rc: Resistor D1: Diode

상기와 같은 목적을 달성하기 위하여 발명된 본 발명의 특징은,Features of the present invention invented to achieve the above object,

입력되는 직류 전원을 소정의 전압으로 변환시켜 각각의 출력단으로 출력하는 DC-DC 컨버터에 있어서,In the DC-DC converter that converts the input DC power to a predetermined voltage and outputs to each output terminal,

상대적으로 출력 전압이 낮은 출력단과 상대적으로 출력 전압이 높은 출력단 사이에 병렬 연결되어 상기 출력 전압이 높은 출력단으로 전류를 인가하는 다이오드와,A diode connected in parallel between an output terminal having a relatively low output voltage and an output terminal having a high output voltage to apply current to an output terminal having a high output voltage;

상기 다이오드를 통해 인가되는 전류의 크기를 조절하도록 상기 다이오드의 케소드와 상기 출력 전압이 높은 출력단 사이에 연결되는 저항을 포함하여 구성되어,And a resistor connected between the cathode of the diode and an output terminal having a high output voltage to adjust a magnitude of a current applied through the diode,

상기 DC-DC 컨버터에서 쇼트 발생시 상기 출력 전압이 낮은 출력단의 전류를 상기 다이오드 및 저항을 통해 상기 출력 전압이 높은 출력단으로 공급하여 상기 DC-DC 컨버터의 쇼트 보호 회로를 구동시키도록 이루어진다.When a short occurs in the DC-DC converter, a current of an output terminal having a low output voltage is supplied to the output terminal having a high output voltage through the diode and a resistor to drive a short protection circuit of the DC-DC converter.

따라서, 여러개의 출력단을 가지는 DC-DC 컨버터에서 쇼트가 발생되면 각 출력단으로 인가되는 전류를 DC-DC 컨버터 내의 쇼트 보호 회로로 인가시켜 회로를 보호할 수 있다.Therefore, when a short occurs in a DC-DC converter having a plurality of output stages, a circuit may be protected by applying a current applied to each output stage to a short protection circuit in the DC-DC converter.

이하, 본 발명에 의한 DC-DC 컨버터의 쇼트 보호 회로의 구성 및 작용을 첨부된 도면을 참조하여 상세하게 설명하면 다음과 같다.Hereinafter, the configuration and operation of the short protection circuit of the DC-DC converter according to the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 의한 DC-DC 컨버터의 쇼트 보호 회로를 나타낸 블록 회로도이다.2 is a block circuit diagram showing a short protection circuit of the DC-DC converter according to the present invention.

도 2를 보면, 쇼트 보호 회로(100)는 다이오드(D1)와 저항(Rc)으로 구성된다.Referring to FIG. 2, the short protection circuit 100 includes a diode D1 and a resistor Rc.

다이오드(D1)는 DC-DC 컨버터에서 쇼트 발생시 +12.5V 출력단의 전류를 +20V 출력단으로 인가하여 DC-DC 컨버터 내의 쇼트 보호 회로(미도시)를 구동시키도록 +12.5V 출력단과 +20V 출력단 사이에 병렬 연결된다.The diode D1 is applied between the + 12.5V output terminal and the + 20V output terminal to drive a short protection circuit (not shown) in the DC-DC converter by applying a current of the + 12.5V output terminal to the + 20V output terminal when a short occurs in the DC-DC converter. Is connected in parallel.

저항(Rc)은 다이오드(D1)를 통해 인가되는 전류의 크기를 조절하도록 다이오드(D1)와 +20V 출력단 사이에 연결된다.The resistor Rc is connected between the diode D1 and the + 20V output terminal to adjust the magnitude of the current applied through the diode D1.

이하, 본 발명에 따른 DC-DC 컨버터의 쇼트 보호 회로의 작용을 도 2를 참조하여 상세하게 설명하면 다음과 같다.Hereinafter, the operation of the short protection circuit of the DC-DC converter according to the present invention will be described in detail with reference to FIG. 2.

먼저, DC-DC 컨버터에서 쇼트 발생하면 +12.5V 출력단으로 인가되는 전류가 다이오드(D1)와 저항(Rc)을 통해 +20V 출력단으로 인가된다.First, when a short occurs in the DC-DC converter, a current applied to the + 12.5V output terminal is applied to the + 20V output terminal through the diode D1 and the resistor Rc.

그러면, +20V 출력단으로 인가되는 전류와 +12.5V 출력단에서 인가된 전류가 서로 합성되어 DC-DC 컨버터 내의 쇼트 보호 회로로 인가되어 쇼트 보호 회로가 구동되어 쇼트로 인한 회로의 파손을 차단한다.Then, the current applied to the + 20V output stage and the current applied at the + 12.5V output stage are combined with each other and applied to the short protection circuit in the DC-DC converter to drive the short protection circuit to prevent damage to the circuit due to the short.

따라서, 구성이 간단한 쇼트 보호 회로를 이용하여 DC-DC 컨버터에서 쇼트가 발생되면 쇼트로 인해 발생되는 과전류로부터 회로 부품을 보호할 수 있다.Therefore, when a short occurs in the DC-DC converter using a short protection circuit with a simple configuration, it is possible to protect the circuit component from the overcurrent generated by the short.

이상에서 설명한 바와 같이 본 발명에 따른 DC-DC 컨버터의 쇼트 보호 회로에 따르면 다음과 같은 이점이 발생한다.As described above, according to the short protection circuit of the DC-DC converter according to the present invention, the following advantages occur.

쇼트 보호 회로를 다이오드와 저항만을 이용하여 단순하게 구성하므로 회로가 단순해지도록 하며, DC-DC 컨버터 내에 내장된 쇼트 보호 회로를 효율적으로 사용할 수 있다.The short protection circuit is simply configured using only a diode and a resistor, which simplifies the circuit and efficiently uses the short protection circuit built in the DC-DC converter.

Claims (1)

입력되는 직류 전원을 소정의 전압으로 변환시켜 각각의 출력단으로 출력하는 DC-DC 컨버터에 있어서,In the DC-DC converter that converts the input DC power to a predetermined voltage and outputs to each output terminal, 상대적으로 출력 전압이 낮은 출력단과 상대적으로 출력 전압이 높은 출력단 사이에 병렬 연결되어 상기 출력 전압이 높은 출력단으로 전류를 인가하는 다이오드와,A diode connected in parallel between an output terminal having a relatively low output voltage and an output terminal having a high output voltage to apply current to an output terminal having a high output voltage; 상기 다이오드를 통해 인가되는 전류의 크기를 조절하도록 상기 다이오드의 케소드와 상기 출력 전압이 높은 출력단 사이에 연결되는 저항을 구비하여,And a resistor connected between the cathode of the diode and an output terminal having a high output voltage to adjust the magnitude of the current applied through the diode, 상기 DC-DC 컨버터에서 쇼트 발생시 상기 출력 전압이 낮은 출력단의 전류를 상기 다이오드 및 저항을 통해 상기 출력 전압이 높은 출력단으로 공급하여 상기 DC-DC 컨버터의 쇼트 보호 회로를 구동시키는 것을 특징으로 하는 DC-DC 컨버터의 쇼트 보호 회로.When the short-circuit occurs in the DC-DC converter, the current of the output terminal with the low output voltage is supplied to the output terminal with the high output voltage through the diode and the resistor to drive a short protection circuit of the DC-DC converter. Short protection circuit of DC converter.
KR1019990036622A 1999-08-31 1999-08-31 Circuit for protecting short of DC-DC converter KR20010019944A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8817429B2 (en) 2010-11-23 2014-08-26 Samsung Display Co., Ltd. Power converter, display device including power converter, system including display device, and method of driving display device
US9058773B2 (en) 2011-05-18 2015-06-16 Samsung Display Co., Ltd. DC-DC converter, display device including the same and method of controlling a driving voltage
US11348497B2 (en) 2010-11-23 2022-05-31 Samsung Display Co., Ltd. Power converter, display device including power converter, system including display device, and method of driving display device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8817429B2 (en) 2010-11-23 2014-08-26 Samsung Display Co., Ltd. Power converter, display device including power converter, system including display device, and method of driving display device
US9673616B2 (en) 2010-11-23 2017-06-06 Samsung Display Co., Ltd. Power converter, display device including power converter, system including display device, and method of driving display device
US10483755B2 (en) 2010-11-23 2019-11-19 Samsung Display Co., Ltd. Display device including power converter
US11348497B2 (en) 2010-11-23 2022-05-31 Samsung Display Co., Ltd. Power converter, display device including power converter, system including display device, and method of driving display device
US11670206B2 (en) 2010-11-23 2023-06-06 Samsung Display Co., Ltd. Power converter, display device including power converter, system including display device, and method of driving display device
US11972709B2 (en) 2010-11-23 2024-04-30 Samsung Display Co., Ltd. Power converter, display device including power converter, system including display device, and method of driving display device
US9058773B2 (en) 2011-05-18 2015-06-16 Samsung Display Co., Ltd. DC-DC converter, display device including the same and method of controlling a driving voltage

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