KR101221971B1 - DC-DC converter - Google Patents

DC-DC converter Download PDF

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KR101221971B1
KR101221971B1 KR1020100013745A KR20100013745A KR101221971B1 KR 101221971 B1 KR101221971 B1 KR 101221971B1 KR 1020100013745 A KR1020100013745 A KR 1020100013745A KR 20100013745 A KR20100013745 A KR 20100013745A KR 101221971 B1 KR101221971 B1 KR 101221971B1
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South Korea
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voltage
inrush current
turned
unit
resistor
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KR1020100013745A
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Korean (ko)
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KR20110094406A (en
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김종오
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(주)그린시스에이오씨
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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
    • 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
    • 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
    • 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
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps

Abstract

본 발명은 배터리 고압전원을 저압전원으로 변환하기 위한 DC-DC 컨버터에 돌입전류(inrush current)의 흐름을 지연, 차단 방지하도록 하는 돌입전류 방지부를 구비하도록 함으로써 회로의 안전성을 높히고. 장치를 소형화시키도록 하며 제조원가를 낮추도록 하는 것이다.The present invention improves the safety of the circuit by providing an inrush current prevention unit for delaying and blocking the flow of inrush current in a DC-DC converter for converting a battery high voltage power source into a low voltage power source. Miniaturize the device and lower the manufacturing cost.

Description

ＤＣ-ＤＣ 컨버터{DC-DC converter}DC-DC converters {DC-DC converter}

본 발명은 DC 직류전원을 다른 전압의 DC 직류전원으로 변환하기 위한 DC-DC 컨버터에 관한 것이다.The present invention relates to a DC-DC converter for converting a DC DC power supply to a DC DC power supply of another voltage.

전기자동차의 배터리의 전원은 통상적으로 72V DC 의 고압 전원으로 이루어지고, 이 고압 전원은 기기의 동작전원인 DC 12V 전원을 인출하기 위해서 DC-DC 컨버터가 사용되며, 고압전원이 컨버터에 공급되는 시점에 회로에 고장을 초래할 수도 있는 돌입전류가 흐르기 때문에 이에 대한 방지기술이 다양하게 개발되고 있다.
이러한 돌입전류를 제한하기 위하여 특허출원제10-2005-74881호(발명의명칭:하이브리드전기자동차의돌입전류방지장치)와 같이 고전압배터리로부터 인버터와 커패시터에 전원이 공급되는 시점에는 회로에 고장을 초래할 수 있는 급작스러운 돌입전류가 흐르기 때문에 커패시터를 완만하게 충전시키기 위하여 저전압 배터리를 사용하여 커패시터를 일정전압 이상으로 충전시키고, 커패시터의 충전전압과 고전압배터리의 전압차이가 설정값 이하인 경우에 고전압배터리로부터 인버터에 전원이공급되도록하는 기술구성이 개발되었다.
그러나 이러한 기술구성에서는 돌입전류를 사용하기위하여 고전압 배터리와 별도의 저전압배터리를 구비하여야 하며, 커패시터를 충전하기위한 전원을 고전압배터리와 저전압배터리로 교체하여야하는 동작이 이루어져야 하기때문에 릴레이구동회로가 필요하여 이중적인 회로구성이 필요하기 때문에 장치의 크기가 커질 수 밖에 없으며, 제조원가가 높아지게 된다.
또한 이러한 구성은 고장빈도가 높은 릴레이구성을 채용함으로써 돌입전류가 회로전체에 흐르게 되어 중요부품들이 소손되어 안전성을 해칠 우려가 있다.The battery power of the electric vehicle is usually composed of a high voltage power of 72V DC, the high-voltage power is used to draw DC 12V power, the operating power of the device, the time point when the high-voltage power is supplied to the converter Since inrush current flows which may cause a fault in the circuit, various techniques for preventing this have been developed.
In order to limit such inrush current, a circuit failure may occur when power is supplied from the high voltage battery to the inverter and the capacitor, such as Patent Application No. 10-2005-74881 (name of the invention: an inrush current prevention device of a hybrid electric vehicle). Because a sudden inrush current flows, a low voltage battery is used to charge the capacitor above a certain voltage in order to slowly charge the capacitor.When the voltage difference between the capacitor's charging voltage and the high voltage battery is lower than the set value, the inverter is operated from the high voltage battery. A technical configuration has been developed to provide power to the system.
However, in this technical configuration, in order to use the inrush current, a high voltage battery and a low voltage battery separate from each other must be provided, and a relay driving circuit is necessary because an operation for replacing the power for charging the capacitor with a high voltage battery and a low voltage battery must be performed. Since the double circuit configuration is required, the size of the device is inevitably increased, and the manufacturing cost is increased.
In addition, by adopting a relay configuration with a high frequency of failure, such a configuration may cause inrush current to flow through the circuit, causing important components to be burned out, thus degrading safety.

삭제delete

본 발명은 이러한 문제점을 해결하기 위한 것으로, 본 발명의 해결과제는 배터리 고압전원을 저압전원으로 변환하기 위한 컨버터에서 직접 돌입전류의 흐름을 방지하도록 함으로써 회로의 안전성을 높히고. 장치를 소형화시키도록 하며 제조원가를 낮추도록 하기 위한 것이다.The present invention is to solve this problem, the problem of the present invention is to improve the safety of the circuit by preventing the flow of inrush current directly in the converter for converting the battery high voltage power source to low voltage power source. In order to reduce the size of the device and to reduce the manufacturing cost.

상기 과제를 해결하기 위한 해결수단은 +, - 선에 인가되는 직류전원(Vin)으로부터 유입되는 돌입전류(inrush current)를 방지하기 위한 돌입전류방지부를 구비하는 DC-DC 컨버터에서: 상기 돌입전류 방지부는 상기 직류전원(Vin)의 전압을 감지하는 전압감지부; 상기 전압감지부의 전압이 기설정된 전압 이상이면 오프(off)되고, 기설정된 전압 미만이면 온(on)되는 스위칭부; 상기 스위칭부가 오프될 때 상기 Vin에 의하여 충전되는 커패시터로 이루어지는 지연부; 상기 -선과 접지사이에 설치되고, 상기 스위칭부가 온 될 때 같이 온 되어 상기 -선과 접지사이를 연결시키고, 상기 스위칭부가 오프 될 때 같이 오프 됨으로써 상기 -선과 접지사이를 분리시키는 돌입전류필터를 포함하는 것이다.In the DC-DC converter having an inrush current prevention unit for preventing inrush current flowing from the DC power (Vin) applied to the +,-line to solve the problem: the inrush current prevention The unit is a voltage sensing unit for sensing the voltage of the DC power supply (Vin); A switching unit which is turned off when a voltage of the voltage detector is greater than or equal to a predetermined voltage, and turned on when the voltage is less than a predetermined voltage; A delay unit comprising a capacitor charged by the Vin when the switching unit is turned off; And an inrush current filter installed between the-line and the ground, and turned on together when the switching unit is turned on, thereby connecting the-line and the ground, and being separated together when the switching unit is turned off. will be.

또한 본 발명에서 상기 돌입전류 방지부는 상기 Vin이 소멸될 때 상기 커패시터에 충전전압을 방전시키는 방전회로를 더 포함하는 것이 바람직하다.In addition, the inrush current prevention unit in the present invention preferably further comprises a discharge circuit for discharging the charging voltage to the capacitor when the Vin is extinguished.

또한 본 발명에서 상기 전압감지부는 + 선과 - 선 사이에는 순차적으로 연결된 다이오드(D1), 저항(R2), (R3)과 저항(R3)에 병렬 연결되는 다이오드(D2)로 이루어지며, 상기 스위칭부는 상기 저항(R3)의 전압에 의하여 온되거나 오프되는 트랜지스터(T1)이고, 상기 커패시터는 상기 트랜지스터(T1)의 콜렉터와 에미터 사이에 연결되며, 상기 돌입전류필터는 소오스가 - 선에, 드레인이 접지에 연결되며, 상기 트랜지스터(T1)의 에미터에 저항(R4)을 통하여 게이트가 연결되는 FET인 것이 바람직하다.In the present invention, the voltage sensing unit is composed of a diode (D1), resistor (R2), (R3) and a diode (D2) connected in parallel between the + line and the-line in sequence, the switching unit The transistor T1 is turned on or off by the voltage of the resistor R3, and the capacitor is connected between the collector and the emitter of the transistor T1, and the inrush current filter has a source of-line and a drain of It is preferably a FET connected to ground and having a gate connected to the emitter of the transistor T1 through a resistor R4.

상기 과제와 해결수단을 갖는 본 발명에 따르면, 고압의 배터리의 전원을 이용하는 전기자동차에서 키 입력이 있는 경우 갑작스러운 돌입전류가 흐르는 것을 커패시터가 지연시킴으로써 DC-DC 컨버터 및 연결된 전기소자를 보호하고, 키가 아크방전에 의하여 손상되는 것을 보호할 수 있다.According to the present invention having the above problems and solving means, by protecting the DC-DC converter and the connected electrical elements by the capacitor delays the sudden inrush current flows when there is a key input in the electric vehicle using a high-voltage battery power, It can protect the key from being damaged by arc discharge.

도 1은 본 발명의 일실시예의 전체적인 구성의 회로도이다.
도 2는 본 발명의 일실시예의 돌입전류 방지부의 구체적인 회로도이다.
도 3은 본 발명의 돌입전류 방지부가 설치된 상태의 출력전압(a)과 돌입전류 방지부가 설치되지 않은 상태의 출력전압(b)을 도시한 실영상이다.1 is a circuit diagram of the overall configuration of one embodiment of the present invention.
2 is a detailed circuit diagram of the inrush current prevention unit of an embodiment of the present invention.
3 is a real image showing the output voltage (a) in the state where the inrush current protection unit is installed and the output voltage (b) in the state where the inrush current protection unit is not installed.

이하, 첨부된 도면에 따라서 본 발명의 실시예를 상세히 설명하기로 한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 일실시예의 전체적인 구성의 회로도이다.1 is a circuit diagram of the overall configuration of one embodiment of the present invention.

도 1에 도시된 실시예는 +선, -선 사이에 인가되는 입력전원 Vin, 바람직하게는 DC-72V를 저압 전원Vout, 바람직하게는 DC-12V로 변환하는 DC-DC 변환부(10)와, 돌입전류(inrush current)가 DC-DC 변환부(10)에 유입되는 것을 방지하도록 돌입전류 방지부(20)로 이루어진다.1 shows a DC-DC converter 10 for converting an input power Vin, preferably DC-72V, to a low voltage power supply Vout, preferably DC-12V, which is applied between + and-lines. The inrush current prevention unit 20 may prevent the inrush current from flowing into the DC-DC converter 10.

돌입전류 방지부(20)는 Vin 전압을 감지하는 전압감지부(210), 전압감지부(210)에 감지된 전압이 12V 이상일 때 오프(off)되며, 12V 미만일 일 때 온(on)되는 스위칭부(230)와, 스위칭부(230)의 오프신호에 의하여 충전되기 시작하는 커패시터를 구비하여 Vin 유입되는 돌입전류를 지연시키는 지연부(220), 스위칭부(230)가 온될 때 같이 온되며 오프될 때 같이 오프되는 FET 소자로 이루어져 -선을 접지에 연결하거나 분리시키는 돌입전류필터(240)로 이루어진다.The inrush current prevention unit 20 is switched off when the voltage detected by the voltage sensing unit 210 that detects the Vin voltage, the voltage sensing unit 210 is more than 12V, and when less than 12V The delay unit 220 and the switching unit 230 which are provided with the capacitor 230 and the capacitor starting to be charged by the OFF signal of the switching unit 230 to delay the inrush current flowing into Vin are turned on together when the switching unit 230 is turned on. It is composed of an inrush current filter 240 that is made of a FET device that is turned off together when the -wire is connected to or separated from the ground.

도 2는 본 발명의 일실시예의 돌입전류 방지부의 구체적인 회로도이다.2 is a detailed circuit diagram of the inrush current prevention unit of an embodiment of the present invention.

전압감지부(210)는 Vin의 + 선과 - 선 사이에는 순차적으로 연결된 다이오드(D1), 저항(R2), (R3)과 저항(R3)에 병렬 연결되는 다이오드(D2)로 이루어지며, 저항(R3)에는 저항(R2)에 대한 Vin의 분압전압(Vin * R3/(R2+R3))이 인가되게 된다. 즉, 저항R3에는 Vin에 비례되는 전압이 감지되게 된다. 또한, 다이오드(D1)의 캐소오드와 -선 사이에는 저항(R2), (R3)와 병렬로 저항(R1)과 트랜지스터(T1)가 연결된다. 이때 트랜지스터(T1)는 NPN 형으로 에미터는 저항(R1)에 콜렉터는 -선에 연결되고, 베이스는 저항(R2), (R3)의 접속점에 연결된다. 저항(R2), (R3)들은 저항(R2), (R3)의 접속점의 전위가 -선에 대하여 12V 상승되게 되면 트랜지스터(T1)가 불통되도록 설계된다.The voltage sensing unit 210 is composed of a diode (D1), a resistor (R2), a resistor (R3) and a diode (D2) connected in parallel to the resistor (R3) in sequence between the + and-lines of Vin, the resistance ( The divided voltage Vin (Vin * R3 / (R2 + R3)) of Vin with respect to the resistor R2 is applied to R3). That is, a voltage proportional to Vin is sensed by the resistor R3. In addition, the resistor R1 and the transistor T1 are connected in parallel with the resistors R2 and R3 between the cathode of the diode D1 and the-line. The transistor T1 is of the NPN type, the emitter is connected to the resistor R1, the collector is connected to the-line, and the base is connected to the connection points of the resistors R2 and R3. The resistors R2 and R3 are designed such that the transistor T1 is turned off when the potential of the connection point of the resistors R2 and R3 is increased by 12V with respect to the-line.

또한 트랜지스터(T1)의 에미터와 콜렉터 사이에는 돌입전류 지연용 커패시터(C)와 커패시터(C)의 보호용 제너 다이오드(ZD)가 연결된다.In addition, an inrush current delay capacitor C and a protective zener diode ZD of the capacitor C are connected between the emitter and the collector of the transistor T1.

또한 - 선과 접지 사이에는 FET(F1)가 설치된다. 이때 FET(F1)의 소오스는 접지에 연결되고, 드레인은 -선에 연결되며 게이트와 트랜지스터(T1)의 에미터는 저항(R4)로 연결된다.In addition, a FET (F1) is provided between the line and the ground. At this time, the source of the FET F1 is connected to ground, the drain is connected to the-line, and the gate and the emitter of the transistor T1 are connected to the resistor R4.

이와 같이 구성되는 돌입전류 방지부는 +, - 선의 입력단자에 Vin 전압이 인가되게 되면 저항(R2), (R3)의 접속점에 분압전압이 발생되고, 분압전압이 기설정된 값(12V)을 넘기 전까지는 트랜지스터(T1)가 온 상태로 되어 커패시터(C)의 전하가 축적되지 않게 되고, FET(F1)의 게이트는 저전위를 유지하게 됨으로써 F1은 ON 상태를 이루게 되어 -선을 접지시키게 됨으로써 정상상태를 유지하게 된다. 그러나 Vin에 돌입전류가 유입되게 되면 저항(R2), (R3)의 접속점의 분압전압이 기설정된 값(12V)을 넘게 되므로 트랜지스터(T1)는 OFF 상태로 되기 때문에 돌입전류에 의하여 커패시터(C)는 충전되게 되고, FET(F1)는 OFF 상태로 되어 - 선과 접지가 분리되게 되어 Vin이 DC-DC 변환부(10)에 공급되지 않게 된다.When the inrush current prevention unit configured as described above is applied with Vin voltage to the input terminals of the + and-lines, a divided voltage is generated at the connection points of the resistors R2 and R3, and the divided voltage exceeds the predetermined value (12V). The transistor T1 is turned on so that the charge of the capacitor C does not accumulate, and the gate of the FET F1 maintains a low potential, whereby F1 is turned on and the ground line is grounded. Will be maintained. However, when the inrush current flows into Vin, the divided voltage of the connection points of the resistors R2 and R3 exceeds the preset value (12V), so the transistor T1 is turned off, so the capacitor C Is charged, the FET F1 is turned OFF, and the-line and the ground are separated so that Vin is not supplied to the DC-DC converter 10.

또한 본 발명의 DC-DC 컨버터는 전기자동차에 주로 사용되기 때문에 Vin은 자동차 키를 온 시켰을 때 배터리의 출력전압이 Vin으로 DC-DC 컨버터에 유입되게 되고, 키를 오프 시키게 되면, 저항(R2), (R3)의 접속점에는 커패시터(C)의 방전전압에 의하여 기설정된 전압보다 낮게 인가되게 되어 커패시터(C)의 전압은 저항(R1), (R2), (R3) 및 FET를 통하여 접지측으로 방전되게 됨으로써 돌입전류 방지부는 리세트(Reset) 되게 된다.In addition, since the DC-DC converter of the present invention is mainly used in electric vehicles, when Vin turns on the car key, the output voltage of the battery flows into the DC-DC converter to Vin, and when the key is turned off, the resistor (R2) , The connection point of (R3) is applied lower than the voltage set by the discharge voltage of the capacitor (C) so that the voltage of the capacitor (C) is discharged to the ground side through the resistors (R1), (R2), (R3) and FET As a result, the inrush current prevention portion is reset.

도 3은 본 발명의 돌입전류 방지부가 설치된 상태의 출력전압(a)과 돌입전류 방지부가 설치되지 않은 상태의 출력전압(b)을 도시한 실영상이다.3 is a real image showing the output voltage (a) in the state where the inrush current protection unit is installed and the output voltage (b) in the state where the inrush current protection unit is not installed.

도 3의 (b)에 도시된 바와 같이 돌입전류 방지부가 설치되지 않은 상태에서는 급작스러운 돌입전류가 흐르게 되고, 이와 같이 돌입전류가 흐르게 되면 DC-DC 변환부의 회로소자가 소손되게 되거나, 전기 자동차의 키의 입력 시에 돌입전류의 흐름에 의하여 키가 아크방전에 의한 손상되게 되어 키를 장기간 사용할 수 없게 된다. 돌입전류 방지부가 설치되게 되면 도 3의 (a)의 영상과 같이 돌입전류가 방지되어 전기 자동차의 키의 입력 시나 운행 중에도 균일한 전류가 흐르게 되어 회로소자의 손상이나 키의 손상을 방지할 수 있다.As shown in FIG. 3B, a sudden inrush current flows in a state where the inrush current prevention unit is not installed, and when the inrush current flows, the circuit element of the DC-DC converter is burned out, or The flow of inrush current at the time of key input damages the key due to arc discharge, and the key cannot be used for a long time. When the inrush current prevention unit is installed, the inrush current is prevented as shown in the image of FIG. 3 (a), and a uniform current flows even when the key of the electric vehicle is pressed or in operation, thereby preventing damage to the circuit element or damage to the key. .

10: DC-DC 변환부 20: 돌입전류 방지부
210: 전압감지부 230: 스위칭부
240: 돌입전류필터10: DC-DC converter 20: inrush current prevention unit
210: voltage detection unit 230: switching unit
240: inrush current filter

Claims (3)

+, - 선에 인가되는 직류전원(Vin)으로부터 유입되는 돌입전류(inrush current)를 방지하기 위한 돌입전류방지부를 구비하는 DC-DC 컨버터에서:
상기 돌입전류 방지부는
상기 직류전원(Vin)의 전압을 감지하는 전압감지부;
상기 전압감지부의 전압이 기설정된 전압 이상이면 오프(off)되고, 기설정된 전압 미만이면 온(on)되는 스위칭부;
상기 스위칭부가 오프될 때 상기 직류전원(Vin)에 의하여 충전되는 커패시터로 이루어지는 지연부;
상기 -선과 접지사이에 설치되고, 상기 스위칭부가 온 될 때 같이 온 되어 상기 -선과 접지사이를 연결시키고, 상기 스위칭부가 오프 될 때 같이 오프 됨으로써 상기 -선과 접지사이를 분리시키는 돌입전류필터를 포함하는 것을 특징으로 하는 DC-DC 컨버터.In a DC-DC converter with an inrush current protection unit to prevent inrush current flowing from the DC power source applied to the + and-lines:
The inrush current prevention unit
A voltage sensing unit sensing a voltage of the DC power source Vin;
A switching unit which is turned off when a voltage of the voltage detector is greater than or equal to a predetermined voltage, and turned on when the voltage is less than a predetermined voltage;
A delay unit formed of a capacitor charged by the DC power source Vin when the switching unit is turned off;
And an inrush current filter installed between the-line and the ground, and turned on together when the switching unit is turned on, thereby connecting the-line and the ground, and being separated together when the switching unit is turned off. DC-DC converter, characterized in that. 청구항 1에서, 상기 돌입전류 방지부는 상기 직류전원(Vin)이 소멸될 때 상기 커패시터에 충전전압을 방전시키는 방전회로를 더 포함하는 것을 특징으로 하는 DC-DC 컨버터.The DC-DC converter according to claim 1, wherein the inrush current prevention unit further comprises a discharge circuit for discharging a charging voltage to the capacitor when the DC power supply (Vin) is extinguished. 청구항 1에서, 상기 전압감지부는 + 선과 - 선 사이에는 순차적으로 연결된 다이오드(D1), 저항(R2), (R3)과 저항(R3)에 병렬 연결되는 다이오드(D2)로 이루어지며, 상기 스위칭부는 상기 저항(R3)의 전압에 의하여 온 되거나 오프 되는 트랜지스터(T1)이고, 상기 커패시터는 상기 트랜지스터(T1)의 콜렉터와 에미터 사이에 연결되며, 상기 돌입전류필터는 소오스가 - 선에, 드레인이 접지에 연결되며, 상기 트랜지스터(T1)의 에미터에 저항(R4)을 통하여 게이트가 연결되는 FET인 것을 특징으로 하는 DC-DC 컨버터.The method of claim 1, wherein the voltage sensing unit comprises a diode (D1), a resistor (R2), a resistor (R3) and a diode (D2) connected in parallel to the resistor (R3) sequentially connected between the + line and the-line, the switching unit A transistor T1 that is turned on or off by the voltage of the resistor R3, and the capacitor is connected between the collector and the emitter of the transistor T1, and the inrush current filter has a source of-line and a drain of DC-DC converter, characterized in that the FET is connected to the ground, the gate is connected to the emitter of the transistor (T1) through a resistor (R4).
KR1020100013745A 2010-02-16 2010-02-16 DC-DC converter KR101221971B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990000538A (en) * 1997-06-07 1999-01-15 윤종용 Inrush Current Limiting Circuit
JP2001339940A (en) 2000-05-23 2001-12-07 Kyocera Corp Power supply having power-switch means
KR20070053000A (en) * 2005-11-18 2007-05-23 진정윤 Active type noise remove apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990000538A (en) * 1997-06-07 1999-01-15 윤종용 Inrush Current Limiting Circuit
JP2001339940A (en) 2000-05-23 2001-12-07 Kyocera Corp Power supply having power-switch means
KR20070053000A (en) * 2005-11-18 2007-05-23 진정윤 Active type noise remove apparatus

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