KR100226626B1 - Overcurrent protecting circuit - Google Patents
Overcurrent protecting circuit Download PDFInfo
- Publication number
- KR100226626B1 KR100226626B1 KR1019960062973A KR19960062973A KR100226626B1 KR 100226626 B1 KR100226626 B1 KR 100226626B1 KR 1019960062973 A KR1019960062973 A KR 1019960062973A KR 19960062973 A KR19960062973 A KR 19960062973A KR 100226626 B1 KR100226626 B1 KR 100226626B1
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- switching means
- switching unit
- protection circuit
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Classifications
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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
-
- 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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
[목적][purpose]
본 발명은 회로구성이 간단하게 되고 응답속도가 빠르며 잡음 특성이 증대되는 과전류 보호회로를 제공하기 위함이다.The present invention aims to provide an overcurrent protection circuit which has a simple circuit configuration, a fast response speed, and an increase in noise characteristics.
[구성][Configuration]
본 발명은 과전류가 차단되도록 제어부와 감지부에 의하여 제어되어 스위칭되는 스위칭부와, 상기 스위칭부가 제어되도록 되고 스위칭부의 출력과 연동되는 감지부와, 상기 스위칭부가 스위칭되도록 제어되는 제어부로 구성되는 것이다.The present invention comprises a switching unit controlled and switched by a control unit and a sensing unit to block overcurrent, a sensing unit to be controlled and interlocked with an output of the switching unit, and a control unit controlled to switch the switching unit.
Description
제1도는 종래 기술에 따른 과전류 보호회로도,1 is an overcurrent protection circuit according to the prior art,
제2도는 본 발명에 따른 과전류 보호회로도이다.2 is an overcurrent protection circuit according to the present invention.
도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings
10 : 차단부 20 : 비교부10: breaker 20: comparator
30 : 제어부 40 : 스위칭부30: control unit 40: switching unit
50 : 감지부50: detector
본 발명은 과전류 보호회로에 관한 것으로서, 더욱 상세하게는 회로구성이 간단하게 되고 응답속도가 빠르며 잡음 특성이 증대되는 과전류 보호회로에 관한 것이다.The present invention relates to an overcurrent protection circuit, and more particularly, to an overcurrent protection circuit in which the circuit configuration is simple, the response speed is high, and the noise characteristic is increased.
일반적으로 파워써플라이는 입력되는 전류 및 전압이 과전류 및 과전압 상태가 되는 경우 그리고 파워써플라이가 외부의 영향이던지 내부의 영향에 따라서 온도가 상승되는 경우에도 이에 따라서 회로가 차단되어 파워써플라이가 보호되도록 되는 회로가 구성된다.In general, a power supply is a circuit that protects the power supply when the current and voltage input become overcurrent and overvoltage conditions, and even when the power supply rises due to external or internal influences. Is composed.
제1도는 종래 기술에 따른 과전류 보호회로도이다.1 is an overcurrent protection circuit according to the prior art.
종래 기술에 따른 과전류 보호회로는 제어부(30)의 제어에 의하여 스위칭되는 차단부(10)와, 상기 차단부(10)의 출력을 입력으로 하여 비교하는 비교부(20)와, 상기 비교부(20)의 출력이 차단부(10)로 궤환되도록 되는 제어부(30)로 구성된다.The overcurrent protection circuit according to the prior art includes a breaker 10 switched by the control of the controller 30, a comparator 20 comparing the output of the breaker 10 as an input, and the comparator ( The control unit 30 is configured such that the output of 20 is fed back to the blocking unit 10.
상기와 같이 구성되는 종래 기술에 따른 과전류 보호회로는 과전류가 파워써플라이에 흐르는 경우에 차단부(10)의 전계효과 트랜지스터인 스위칭수단(Q1)에 흐르는 전류(Id)와 소스저항인 저항(Rs)에 의하여 형성되어 오피암프인 비교부(20)의 비반전입력단(+)에 인가되는 전압이 전원(Vcc)가 저항(R2)와 저항 (R3)에 의하여 분배되어 반전입력단(-)에 인가되는 전압보다 크게되면, 비교부(20)의 출력은 하이 (High)가 되어 제어부(30)에 인가되고, 상기 제어부(30)는 저항(R)을 통하여 차단부(10)의 전계효과 트랜지스터인 스위칭수단(Q1)의 게이트에 로우(Low)를 인가함으로써, 스위칭수단(Q1)은 오프되어 파워써플라이에서 과전류가 흐르지 못하게 보호되도록 동작된다.In the overcurrent protection circuit according to the related art configured as described above, when the overcurrent flows through the power supply, the current Id flowing through the switching means Q1 which is the field effect transistor of the blocking unit 10 and the resistance Rs which is the source resistance The voltage applied to the non-inverting input terminal (+) of the comparator 20, which is an op amp, is divided by the resistor R2 and the resistor R3 and applied to the inverting input terminal (-). When the voltage is greater than the voltage, the output of the comparator 20 becomes high and applied to the controller 30, and the controller 30 is a field effect transistor of the breaker 10 through the resistor R. By applying a low to the gate of the means Q1, the switching means Q1 are operated to be off to protect against overcurrent flow in the power supply.
그러나, 종래 기술에 따른 과전류 보호회로는 소스저항에서 발생되는 손실이 크고, 비교부 및 제어부를 경유하기 때문에 응답속도가 저하되며, 주변회로가 복잡해지는 문제점이 있었다.However, the overcurrent protection circuit according to the related art has a problem in that the loss generated from the source resistance is large, the response speed is lowered through the comparator and the controller, and the peripheral circuit is complicated.
따라서 본 발명은 상기와 같은 종래의 문제점을 해결하기 위해 안출한 것으로 발명의 주된 목적은 회로구성이 간단하게 되고 응답속도가 빠르며 잡음특성이 증대되는 과전류 보호회로를 제공하기 위함이다.Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and the main object of the present invention is to provide an overcurrent protection circuit which has a simple circuit configuration, a fast response speed, and an increase in noise characteristics.
상기 목적을 달성하기 위한 본 발명의 특징은Features of the present invention for achieving the above object
과전류가 차된되도록 제어부와 감지부에 의하여 제어되어 스위칭되는 스위칭부와, 상기 스위칭부가 제어되도록 하고 스위칭부의 출력과 연동되는 감지부와, 상기 스위칭부가 스위칭되도록 제어되는 제어부로 구성되는 과전류 보호회로에 있는 것이다.In the over-current protection circuit consisting of a switching unit controlled and switched by the control unit and the sensing unit so that the over-current is charged, a sensing unit to control the switching unit and interlocked with the output of the switching unit, and a control unit to control the switching unit will be.
이하 첨부도면에 의하며 본 발명에 따른 과전류 보호회로의 바람직한 일실시예에 대하여 상세하여 설명한다.Hereinafter, a preferred embodiment of the overcurrent protection circuit according to the present invention according to the accompanying drawings will be described in detail.
제2도는 본 발명에 따른 과전류 보호회로도이다.2 is an overcurrent protection circuit according to the present invention.
본 발명에 따른 과전류 보호회로는 과전류가 차단되도록 제어부(30)와 감지부(50)에 의하여 제어되어 스위칭되는 스위칭부(40)와, 상기 스위칭부(40)가 제어되도록 되고 스위칭부(40)의 출력과 연동되는 감지부(50)와, 상기 스위칭부(40)가 스위칭되도록 제어되는 제어부(30)로 구성된다.In the overcurrent protection circuit according to the present invention, the switching unit 40 is controlled and switched by the control unit 30 and the sensing unit 50 so that the overcurrent is blocked, and the switching unit 40 is controlled and the switching unit 40 The sensing unit 50 is interlocked with the output of the control unit 30 is controlled so that the switching unit 40 is switched.
상기 스위칭부(40)의 전계효과 트랜지스터인 제1스위칭수단(Q1)과 제2스위칭수단(Q2)은 직렬로 연결되어 제1스위칭수단(Q1)의 게이트는 저항(R1)을 통하여 제어되도록 제어부(30)가 연결되고, 제2스위칭수단(Q2)의 게이트는 저항(R2)를 통하여 제어되도록 감지부(50)에 연결된다.The first switching means Q1 and the second switching means Q2 of the field effect transistor of the switching unit 40 are connected in series so that the gate of the first switching means Q1 is controlled through the resistor R1. 30 is connected, and the gate of the second switching means Q2 is connected to the sensing unit 50 to be controlled through the resistor R2.
상기 감지부(50)는 제1스위칭수단(Q1)과 제2스위칭수단 (Q2) 사이의 전압이 저항(R3)(R4)에 의하여 분배되어 게이트로 연결되고, 전원(Vcc)이 저항(R5)을 통하여 그리고 스위칭부(40)의 제2스위칭수단(Q2)의 게이트에 저항(R2)를 통하여 콜렉터로 연결되며, 상기 콜렉터와 접지되는 에미터 사이에 콘덴서(C1)가 연결되는 바이폴라 트랜지스터인 제3스위칭수단(Q3)으로 구성된다.In the sensing unit 50, a voltage between the first switching means Q1 and the second switching means Q2 is divided by the resistors R3 and R4 and connected to the gate, and the power source Vcc is connected to the resistor R5. And a bipolar transistor connected to the gate of the second switching means Q2 of the switching unit 40 through a resistor R2, the capacitor C1 being connected between the collector and the grounded emitter. It consists of 3rd switching means Q3.
다음은 상기와 같이 구성된 본 발명의 작동상태에 대해서 설명한다.The following describes the operating state of the present invention configured as described above.
과전류가 발생되는 비정상적인 동작이 되는 경우, 드레인 전류(Id)는 제2스위칭수단(Q2) 온되었을 때, 발생되는 전계효과 트랜지스터의 드레인과 소스사이의 저항(Rdson)에 의해 유기된 전압(Va)이 저항(R3)(R4)에 의하여 분배된 전압(Vcc)이 감지부(50)의 제3스위칭수단(Q3)인 바이폴라 트랜지스터의 베이스로 인가된다. 상기 전압(Vc)에 의하여 제3스위칭수단(Q3)이 온되고, 스위칭부(40)의 제2스위칭수단(Q2)이 오프되며, 드레인 전류(Id)는 제1스위칭수단(Q1)과 저항(R3)(R4)를 통하여 흐르게 된다. 이 때, 제어부(30)는 스위칭부(40)의 제1스위칭수단(Q1)이 온 또는 오프되도록 제어되지만, 감지부(50)의 콘덴서(C1)에 의하여 전압이 충전되고 방전되는 시간만큼 지연되기 때문에 스위칭부(40)의 제2스위칭수단(Q2)은 순간적으로 온상태가 되지 못하여 상기 충방전되는 시간만큼 제2스위칭수단(Q2)은 지연되어 스위칭되게 된다.In an abnormal operation in which an overcurrent is generated, the drain current Id is induced by the resistance R dson between the drain and the source of the field effect transistor generated when the second switching means Q2 is turned on. The voltage Vcc distributed by the resistors R3 and R4 is applied to the base of the bipolar transistor, which is the third switching means Q3 of the sensing unit 50. The third switching means Q3 is turned on by the voltage Vc, the second switching means Q2 of the switching unit 40 is turned off, and the drain current Id is connected to the first switching means Q1 and the resistor. It flows through (R3) (R4). At this time, the controller 30 is controlled so that the first switching means Q1 of the switching unit 40 is turned on or off, but is delayed by a time for which the voltage is charged and discharged by the capacitor C1 of the sensing unit 50. As a result, the second switching means Q2 of the switching unit 40 does not turn on momentarily, and thus the second switching means Q2 is delayed and switched as much as the charging and discharging time.
상기와 같이 정상동작되는 경우, 드레인 전류(Id)는 제1스위칭수단(Q1)과 제2스위칭수단(Q2)을 통하여 흐르게 되고, 과전류가 발생되는 비정상적인 동작이 되는 경우, 드레인 전류(Id)는 제1스위칭수단(Q1)과 저항(R3)(R4)를 통하여 흐르는데 이 때, 저항(R3)(R4)의 값은 과전류 상태에 제1스위칭수단(Q1)이 보호되도록 정하여진다.In the normal operation as described above, the drain current Id flows through the first switching means Q1 and the second switching means Q2, and in the abnormal operation in which the overcurrent is generated, the drain current Id is Flowing through the first switching means Q1 and the resistors R3 and R4, the values of the resistors R3 and R4 are determined so that the first switching means Q1 are protected in the overcurrent state.
이상에서 상세히 설명한 바와 같이 본 발명에 따른 과전류 보호회로는 회로구성이 간단하게 되고 응답속도가 빠르며 잡음 특성이 증대되는 특징을 지닌 것이다.As described in detail above, the overcurrent protection circuit according to the present invention has a feature that the circuit configuration is simple, the response speed is high, and the noise characteristic is increased.
본 발명은 상기 실시예에 한정되지 않으며, 많은 변형이 본 발명의 기술적 사상 내에서 당 분야의 통상의 지식을 가진 자에 의하여 가능함은 명백하다.The present invention is not limited to the above embodiments, and it is apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960062973A KR100226626B1 (en) | 1996-12-09 | 1996-12-09 | Overcurrent protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960062973A KR100226626B1 (en) | 1996-12-09 | 1996-12-09 | Overcurrent protecting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR19980044835A KR19980044835A (en) | 1998-09-15 |
| KR100226626B1 true KR100226626B1 (en) | 1999-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019960062973A KR100226626B1 (en) | 1996-12-09 | 1996-12-09 | Overcurrent protecting circuit |
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| KR (1) | KR100226626B1 (en) |
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1996
- 1996-12-09 KR KR1019960062973A patent/KR100226626B1/en not_active IP Right Cessation
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| KR19980044835A (en) | 1998-09-15 |
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