KR0114570Y1 - Overcurrent protection circuit - Google Patents

Overcurrent protection circuit Download PDF

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Publication number
KR0114570Y1
KR0114570Y1 KR2019940019197U KR19940019197U KR0114570Y1 KR 0114570 Y1 KR0114570 Y1 KR 0114570Y1 KR 2019940019197 U KR2019940019197 U KR 2019940019197U KR 19940019197 U KR19940019197 U KR 19940019197U KR 0114570 Y1 KR0114570 Y1 KR 0114570Y1
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KR
South Korea
Prior art keywords
reference voltage
overcurrent
voltage
flip
signal
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KR2019940019197U
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Korean (ko)
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KR960006456U (en
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전찬욱
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배순훈
대우전자 주식회사
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    • 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
    • H02H3/087—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 for dc applications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C11/00—Electric fuzes
    • 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
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
    • 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
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

본 고안은 신관의 측정장치에 유입되는 과전류를 차단하여 부품의 소손을 방지하기 위한 과전류 보호회로에 관한 것으로, 과전류 유입시 입력 전류를 차단하여 후단의 측정기기 부품의 소손을 예방하는 차단회로(100)를 통상의 측정장치(200)에 연결되게 구성한 것이다.The present invention relates to an overcurrent protection circuit for preventing the burnout of components by cutting off the overcurrent flowing into the measuring device of the fuse, the blocking circuit for preventing the burnout of parts of the measuring device of the next stage by blocking the input current when the overcurrent inflows (100) ) Is configured to be connected to a conventional measuring device (200).

Description

과전류 차단회로Overcurrent Breaker Circuit

제1도는 본 고안의 구성 블록도1 is a block diagram of the present invention

제2도는 본 고안의 상세 회로도2 is a detailed circuit diagram of the present invention

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

100 : 차단회로 200 : 측정장치100: blocking circuit 200: measuring device

110 : 차단스위치제어부 110' : 플립플롭110: disconnect switch control unit 110 ': flip-flop

120 : A/D변환부 130 : 원칩컴퓨터120: A / D conversion unit 130: one-chip computer

140 : 기준전압표시부 150 : 증폭부140: reference voltage display unit 150: amplification unit

160 : 기준전압설정부 SW : 차단스위치160: reference voltage setting section SW: disconnect switch

LED : 발광다이오드 OP : 증폭기LED: LED OP: Amplifier

CP : 비교기 VR : 가변저항CP: Comparator VR: Variable resistor

R1·Rs : 저항 RY : 릴레이R1, Rs: Resistance RY: Relay

Q : 트랜지스터Q: transistor

본 고안은 신관의 측정장치에 유입되는 과전류를 차단하여 부품의 소손을 방지하기 위한 과전류 차단 회로에 관한 것이다.The present invention relates to an overcurrent blocking circuit for preventing overburning of components by blocking the overcurrent flowing into the measuring device of the fuse.

종래의 신관 측정장치는 전원선을 통해 유입되는 과전류를 차단할 수 있는 별도의 회로가 부가 되어 있지않아 유입되는 과전류로 인하여 신관 측정 장치의 부품이 소손되어 측정 기능이 상실되는 문제점이 발생되었던 것이다.In the conventional fuse measuring apparatus, since a separate circuit for blocking the overcurrent flowing through the power line is not added, a component of the fuse measuring apparatus is burned out due to the inflow of the overcurrent, which causes a problem in that the measuring function is lost.

본 고안에서는 신관 측정장치에 유입되는 과전류를 차단하기 위해 입력단에 차단회로를 삽입하여 과전류 유입시 측정 장치의 부품의 소손을 예방하여 측정기능을 원활하게 함에 그 목적이 있다.In the present invention, the purpose of the present invention is to insert a blocking circuit into the input terminal in order to block the overcurrent flowing into the fuse measuring device, thereby preventing the burnout of components of the measuring device during the inflow of the overcurrent, thereby facilitating the measuring function.

이를 첨부도면에 의해 설명한다.This will be described with reference to the accompanying drawings.

제1도는 본 고안의 블럭도로서, 과전류 유입시 입력전류를 차단하여 후단의 기기를 보호하는 차단회로(100)를 신관을 측정하는 측정장치(200)에 연결되게 구성한다.1 is a block diagram of the present invention, it is configured to be connected to the measuring device 200 for measuring the fuse the circuit 100 to cut off the input current when the over-current flows to protect the equipment of the rear stage.

제2도는 차단회로(100)의 상세 회로도로서, 저항(R1)을 통해 유입되는 입력전류를 키우는 증폭기(OP)로된 증폭부(150)를 반전단자(-)에 연결된 기준전압설정부(160)의 가변저항(VR)에 의해 설정된 기준전압과 비교하여 입력전압이 기준전압 보다 크면 하이신호를 출력하는 비교기(CP)비반전단자(+)에 연결하고, 이의 반전단자(-)를 아날로그 신호를 디지털 신호로 변환하는 A/D변환부(120)를 통해 기준전압표시부(140)에 기준 전압 최대 전류치(120㎃)를 디스플레이하고, 과전류 유입을 판단하여 점등 시키는 발광다이오드(LED)와 접속된 원칩 컴퓨터(130)에 연결하고, 상기 비교기(CP) 출력단을 원칩 컴퓨터(130)와 과전류유입시 차단스위치(SW)를 제어하는 차단스위치제어부(110)의 플립플롭(110') 클럭(CK)단자에 연결하되, 플립플롭(110')을 저항(R2)을 통해 트랜지스터(Q) 베이스에 접속하고, 이의 콜렉터에 과전류 유입시 측정장치(200)에 유입되는 과전류를 차단하는 차단스위치(SW)를 오프시키는 릴레이(RY)를 연결되게 구성한다.FIG. 2 is a detailed circuit diagram of the blocking circuit 100. The reference voltage setting unit 160 connects the amplifier 150, which is an amplifier OP, to increase the input current flowing through the resistor R1, to the inverting terminal (−). When the input voltage is higher than the reference voltage set by the variable resistor VR of the), it is connected to the comparator (CP) non-inverting terminal (+) that outputs a high signal, and its inverting terminal (-) is connected to the analog signal. Is connected to a light emitting diode (LED) which displays a reference voltage maximum current value (120 mA) on the reference voltage display unit 140 through the A / D conversion unit 120 for converting the signal into a digital signal, and determines the overcurrent inflow. The flip-flop 110 'clock CK of the cutoff switch controller 110 connected to the one-chip computer 130 and controlling the cutoff switch SW when the comparator (CP) output terminal is connected to the one-chip computer 130 and overcurrent flow. The flip-flop 110 'to a transistor (Q) through a resistor (R2). The relay RY is connected to the case, and the collector RY turns off the shut-off switch SW that cuts off the overcurrent flowing into the measuring apparatus 200 when the overcurrent flows.

이하 첨부도면에 의해 작용효과를 설명한다.The effects will be described below with reference to the accompanying drawings.

측정장치(200)에 입력되는 전류를 차단회로(100)의 증폭부(150) 저항(R1) 양단에 걸리는 전압을 증폭기(OP)를 통해 차동 증폭하여 비교기(CP) 비반전단자(+)에 입력하면 상기 비교기(CP)는 반전단자(-)에 접속된 기준전압설정부(160)의 가변저항(VR)에 의해 설정된 기준전압과 증폭기(OP)로부터 입력된 값을 비교하여 기준전압 이상이 되면 과전류가 유입되었으므로 하이 신호를 출력하여 원칩컴퓨터(130)와 차단스위치제어부(110)의 플립플롭(110') 클럭(CK)단자에 입력한다.The current input to the measuring device 200 is differentially amplified through the amplifier OP to a voltage applied across the resistor R1 of the amplifier 150 of the blocking circuit 100 to the non-inverting terminal of the comparator CP. When inputted, the comparator CP compares the reference voltage set by the variable resistor VR of the reference voltage setting unit 160 connected to the inverting terminal (−) with a value input from the amplifier OP to determine whether or not the reference voltage is higher than or equal to the reference voltage. When the over-current flowed in, a high signal is output and input to the flip-flop 110 'clock CK terminal of the one-chip computer 130 and the cutoff switch controller 110.

한편 기준전압설정부(160)의 가변저항(VR)에 의해 설정된 기준전압은 A/D변환부(120)를 경유하여 아날로그 신호가 디지털 신호를 변환되여 원칩컴퓨터(130)에 인가되므로 상기 원칩컴퓨터(130)는 인가된 기준전압을 기준전압표시부(140)에 최대 전류치로서 디스플레이 하고, 비교기(CP)로부터 입력된 신호가 하이 신호 이므로, 입력단에 과전류가 유입되었음을 판단하여 발광다이오드(LED)를 점등 시켜 작업자에게 알리고, 차단 스위치제어부(110)의 플립플롭(110')에 리셋(RST) 신호를 인가하여 비교기(CP)에서 출력된 하이신호에 의해 상기 플립플롭(110')은 이를 동기시켜 하이 신호를 출력하여 트랜지스터(Q)를 도통시켜 릴레이(RY)가 구동되어 이와 연동되는 차단스위치(SW)를 오프시키므로 신관의 측정장치(200)에 인가되는 과전류유입을 차단한다.The reference voltage set by the variable resistor VR of the reference voltage setting unit 160 is converted into a digital signal through the A / D conversion unit 120 and applied to the one chip computer 130. The display unit 130 displays the applied reference voltage as the maximum current value on the reference voltage display unit 140, and since the signal input from the comparator CP is a high signal, it determines that overcurrent has flowed into the input terminal and turns on the LED. The flip-flop 110 'is synchronized with the high signal output from the comparator CP by applying a reset (RST) signal to the flip-flop 110' of the cutoff switch control unit 110. By outputting a signal and conducting the transistor Q, the relay RY is driven to turn off the cutoff switch SW interlocked with the relay RY, thereby preventing the overcurrent flow applied to the measuring device 200 of the fuse.

상술한 바와 같이 작용되는 본 고안은 측정장치(200)에 불규칙하게 유입되는 과전류를 전단에 설치된 차단회로(100)가 차단하므로서 측정장치(200)의 부품의 소손을 미연에 방지하여 신관의 기능 측정을 원활하게 할 수 있다.The present invention, which operates as described above, blocks the overcurrent flowing irregularly into the measuring device 200 by the blocking circuit 100 installed at the front end, thereby preventing the burnout of components of the measuring device 200 in advance, thereby measuring the function of the fuse. You can do it smoothly.

Claims (3)

통상의 측정장치에 연결되어 과전류 유입시 입력전류를 차단하여 측정부품의 소손을 예방하는 과전류 차단회로에 있어서, 과전류 입력시 오프되어 과전류가 측정회로로 유입되는 것을 방지하는 과전류 차단스위치와 입력되는 전류를 저항을 통해 전압 증폭하는 증폭수단과 가변저항에 의해 기준전압을 설정하는 기준접압 설정수단과 상기 기준전압 설정부에서 기준전압을 디지털값으로 변환하는 A/D변환수단과 상기 증폭수단을 통해 증폭된 입력전압과 상기 기준전압을 비교하여 입력전압이 기준전압보다 클 경우 하이신호를 풀력하는 비교수단과 상기 비교수단의 출력을 클럭신호로 하여 상기 과전류 차단스위치를 제어하는 과전류 차단스우치 제어수단과 상기 비교수단의 출력이 하이일 때 상기 과전류 차단스위치제어부로 리셋신호를 발생하며, 상기 A/D변환수단으로부터 인가된 기준전압을 메모리하는 제어수단과 상기 제어부에 메모리된 기준전압을 표시하는 기준전압표시부를 포함하여서 된 것을 특징으로 하는 과전류 차단회로.An over-current cut-off circuit connected to a normal measuring device to cut off the input current when inflow of overcurrent prevents burnout of the measuring part. Amplifying means for amplifying the voltage through a resistor, a reference voltage setting means for setting a reference voltage by a variable resistor, an A / D conversion means for converting the reference voltage into a digital value in the reference voltage setting unit, and amplifying through the amplifying means. Comparing the input voltage with the reference voltage and comparing the input voltage with the reference voltage if the input voltage is higher than the reference voltage; and the overcurrent blocking switch control means for controlling the overcurrent cutoff switch using the output of the comparing means as a clock signal; When the output of the comparison means is high generates a reset signal to the overcurrent cut-off switch control unit And a control means for storing the reference voltage applied from the A / D conversion means, and a reference voltage display for displaying the reference voltage stored in the controller. 제1항에 있어서, 상기 과전류 차단스위치 제어수단은, 상기 제어수단으로부터 인가되는 리셋신호에 의해 리셋되고 상기 비교수단으로부터 인가되는 신호를 클럭으로 하여 클럭이 하이일 때 하이신호를 출력하는 플립플롭과 상기 플립플롭의 출력신호에 의해 온, 오프되는 트랜지스터와 상기 트랜지스터의 온, 오프상태에 따라 구동되어 상기 과전류차단스위치를 스위칭하는 릴레이를 포함하여서된 것을 특징으로 하는 과전류 차단회로.The flip-flop according to claim 1, wherein the overcurrent disconnect switch control means comprises: a flip-flop for outputting a high signal when the clock is high by resetting by a reset signal applied from the control means and using a signal applied from the comparison means as a clock; And a relay driven by the output signal of the flip-flop and a relay driven according to the on and off states of the transistor to switch the overcurrent cutoff switch. 제1항에 있어서,상기 과전류 차단회로는 상기 입력전압이 상기 기준전압보다 클 경우 점등되는 LED를 더포함하여서 된 것을 특징으로 하는 과전류 차단회로.The overcurrent blocking circuit of claim 1, wherein the overcurrent blocking circuit further comprises an LED that is turned on when the input voltage is greater than the reference voltage.
KR2019940019197U 1994-07-29 1994-07-29 Overcurrent protection circuit KR0114570Y1 (en)

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Application Number Priority Date Filing Date Title
KR2019940019197U KR0114570Y1 (en) 1994-07-29 1994-07-29 Overcurrent protection circuit

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KR960006456U KR960006456U (en) 1996-02-17
KR0114570Y1 true KR0114570Y1 (en) 1998-04-18

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