KR0128143Y1 - Over current detecting circuit for electronic time switch - Google Patents

Over current detecting circuit for electronic time switch Download PDF

Info

Publication number
KR0128143Y1
KR0128143Y1 KR2019930004725U KR930004725U KR0128143Y1 KR 0128143 Y1 KR0128143 Y1 KR 0128143Y1 KR 2019930004725 U KR2019930004725 U KR 2019930004725U KR 930004725 U KR930004725 U KR 930004725U KR 0128143 Y1 KR0128143 Y1 KR 0128143Y1
Authority
KR
South Korea
Prior art keywords
voltage
comparator
current
overcurrent
time switch
Prior art date
Application number
KR2019930004725U
Other languages
Korean (ko)
Other versions
KR940023208U (en
Inventor
한광수
김영관
노재문
Original Assignee
유채준
대한전선주식회사
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 유채준, 대한전선주식회사 filed Critical 유채준
Priority to KR2019930004725U priority Critical patent/KR0128143Y1/en
Publication of KR940023208U publication Critical patent/KR940023208U/en
Application granted granted Critical
Publication of KR0128143Y1 publication Critical patent/KR0128143Y1/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3277Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566Circuits 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
    • G01R19/16571Circuits 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 AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current

Abstract

본 고안은 전자식 타임스위치의 과전류 검출회로에 관한 것으로, 변류기를 통해 입력되는 전류를 강하시키면서 전압으로 바꾸어준 다음 정격의 기준전압 보다 큰 가를 비교 판단하여 외부로 알려주는 동시에 마이크로 프로세서와 스위칭 회로로 출력하도록 한 것이다.The present invention relates to an overcurrent detection circuit of an electronic time switch, and converts the current inputted through the current transformer into a voltage while lowering the current, and compares it to the outside to determine whether it is larger than the rated reference voltage and outputs it to the microprocessor and the switching circuit. I did it.

Description

전자식 타임스위치의 과전류 검출회로Overcurrent Detection Circuit of Electronic Time Switch

제1도는 본 고안의 회로도.1 is a circuit diagram of the present invention.

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

2 : 변류기 3 : 전류-전압 변환부2: current transformer 3: current-voltage converter

4 : 분배부 5 : 제1비교부4: Distribution unit 5: First comparison unit

7 : 제2비교부 9 : 인터페이스부7: second comparison unit 9: interface unit

본 고안은 일정시간동안 전원을 공급하기 위한 타임스위치에 있어서, 외부로 부터 공급되는 전류가 정격보다 현저히 높은 경우에 이를 외부에 알려주면서 일시적으로 차단시키도록 한 전자식 타임스위치의 과전류 검출회로에 관한 것이다.The present invention relates to an overcurrent detection circuit of an electronic time switch that temporarily switches off a time switch for supplying power for a predetermined time, when the current supplied from the outside is significantly higher than the rated value. .

일반적으로 전자식 타임스위치는 심야시간(22시~08시)동안만 전원을 공급받아 동작하는 보일러, 온수기 또는 빙축열기등의 전기기기에 정한 시간에만 전원을 공급하도록 하기위하여 임의로 정한 시각과 현재시각을 비교하면서 전원공급 여부를 결정하도록 한 것임은 이미 잘 알려진 사실이다.In general, the electronic time switch is used to supply power only to the electrical equipment such as boilers, water heaters, or ice heat accumulators that operate only during midnight hours (22 o'clock to 8 o'clock). It is well known that the comparison was made to determine the power supply.

그리고 전자식 타임스위치가 전원을 공급받는 시간이 주로 전력의 사용이 적은 심야시간대이고, 이때에는 많은 부하가 일시적으로 오프되는 경우가 빈번히 발생하게 되므로 순간적으로 과전류가 유입되어 전자식 타임스위치의 정상 동작에 지장을 주는 경우가 빈번하였다.In addition, the time when the electronic time switch is supplied with power is mainly in the midnight time zone where power is low, and in this case, a large number of loads are temporarily turned off frequently, so overcurrent flows in a moment, thus preventing the normal operation of the electronic time switch. It was frequently given.

더구나 심야시간때에는 일반수용가의 사람들이 잠든시간이므로 퓨우즈(Fuse)에 의한 과전류 차단 방식을 채택하게 되면 퓨우즈를 제때 교환할 수 없을 뿐만아니라 퓨우즈의 교환을 위해 잠을 깨야만 하는 번거로움이 있었다.In addition, during the late-night hours, people of ordinary customers fall asleep, so if the over-current cut-off method by fuse is adopted, the fuse cannot be replaced in a timely manner and the trouble of waking up to replace the fuse is troublesome. there was.

이에따라 본 고안의 전자식 타임스위치로 입력되는 전원의 과전류 여부를 검출하여 이를 알려 주도록 한 전자식 타임 스위치의 과전류 검출회로를 제공하는 것을 그 목적으로 한다.Accordingly, an object of the present invention is to provide an overcurrent detection circuit of an electronic time switch that detects and informs whether or not an overcurrent of a power inputted by the electronic time switch of the present invention is known.

이를 위하여 본 고안은 변류기를 통해 입력되는 전류를 강하시키면서 전압으로 바꾸어준 다음 정격의 기준전압보다 큰가를 비교판단하여 외부로 알려주는 동시에 마이크로 프로세서와 스위칭회로로 출력하도록 한 것이다.To this end, the present invention changes the voltage inputted through the current transformer to a voltage, and then compares it to the outside to determine whether it is larger than the reference voltage of the rating and outputs it to the microprocessor and the switching circuit.

이하 본 고안을 첨부 도면에 의거 상세히 기술하여 보면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

부하(Load)(1)로 공급되는 AC전원의 전류를 검출하여 다운시키는 변류기(CT : Current Transformet)(2)와, 상기 변류기(2)에서 검출된 전류를 직류전압으로 바꾸는 브릿지 다이오드(D1), (D2), (D3), (D4)와 콘덴서(C1) 및 저항(R1)으로 이루어진 전류-전압 변환부(3)와, 상기 전류-전압변환부(3)로 부터의 직류전압을 다시 소정의 비율로 줄이는 저항(R2)(R3) 및 가변저향(VR1)으로 이루어진 분배부(4)와, 상기 분배부(4)로부터의 분할전압은 제1비교기(OP1)의 반전입력단으로 인가되도록 하면서 정전압 다이오드(ZD1) 및 가변저항(VR2)을 경유한 기준전압이 비반전 입력단으로 인가되록 한 제1비교부(5)와, 상기 제1비교부(5)의 출력이 L인 경우에 발광다이오드(LED)를 점등시키는 표시부(6)와, 상기 분배부(4)의 분할 전압이 반전 입력단으로 인가되는 제2비교기(OP2)의 비반전 입력단으로 정전압다이오드(ZD2) 및 가변저항(VR3)을 경유한 기준전압이 인가되도록하여 더 높은 과전류 상태를 인식하는 제2비교부(7)와, 상기 제2비교부(7)의 출력이 보호용 정전압 다이오드(ZD3)와 저항(R4), (R5) 및 정전압다이오드(ZD4)를 통해 반전입력단으로 귀환되면서 노이즈에 의한 오동작을 없애는 부귀환부(8)와, 상기 제2비교부(7)의 출력이 인버터(I)를 경유하여 마이크로 프로세서(10)로 출력되는 동시에 마이크로 프로세서(10)로 부터 동작 제어신호가 타측으로 인가되는 앤드게이트(A)의 일측으로 인가되도록 하여 이의 출력단에서 도면에 도시않은 스위칭회로로 제어신호를 출력하는 인터페이스부(9)들로 구성한 것이다.Current transformer (CT) (2) for detecting and down current of AC power supplied to load (1), and bridge diode (D1) for converting the current detected by the current transformer (2) to DC voltage. And a direct current voltage from the current-voltage converter (3) consisting of (D2), (D3), (D4), a capacitor (C1), and a resistor (R1). A divider 4 consisting of resistors R2 and R3 and a variable resistance VR1 that are reduced at a predetermined rate, and the divided voltage from the divider 4 is applied to the inverting input terminal of the first comparator OP1. While the output of the first comparator 5 and the first comparator 5 to which the reference voltage via the constant voltage diode ZD1 and the variable resistor VR2 is applied to the non-inverting input terminal, the light is emitted. The display unit 6 for turning on the diode LED and the non-inverting input terminal of the second comparator OP2 to which the divided voltage of the distribution unit 4 is applied to the inverting input terminal. The second comparator 7 for recognizing a higher overcurrent state by allowing the reference voltage via the voltage diode ZD2 and the variable resistor VR3 to be applied, and the output of the second comparator 7 to protect the constant voltage diode The negative feedback unit 8 which returns to the inverting input terminal through the ZD3, the resistors R4, R5, and the constant voltage diode ZD4 and eliminates the malfunction caused by noise, and the output of the second comparing unit 7 are inverters. A switching circuit (not shown in the figure) is outputted to the microprocessor 10 via (I) and at the same time the operation control signal from the microprocessor 10 is applied to one side of the end gate A applied to the other side. It consists of the interface unit 9 for outputting a control signal.

이와같이 구성한 본 고안의 전자식 타임스위치의 과전류 검출회로는 부하(1)로 공급되는 AC전원의 전류를 변류기(2)에서 검출하여 다운시킨 후 전류-전압 변환부(3)의 브릿지 다이오드(D1)~(D4)에 의해 직류 성분으로 바꾼다음 저항(R1) 및 콘덴서(C1)를 경유하는 중에 직류전압으로 바뀌도록 한다.The overcurrent detection circuit of the electronic time switch of the present invention configured as described above detects and downs the current of the AC power supplied to the load 1 in the current transformer 2 and then bridges diodes D1 to the current-voltage converter 3. Change to DC component by (D4) and change to DC voltage while passing through resistor R1 and capacitor C1.

상기 직류전압으 분배부(4)의 저항(R2), (R3) 및 가변저항(VR1)의 비율에 따라 소정비율로 분할되도록 하고, 이분할 전압은 제1비교부(5) 및 제2비교부(7)의 비교전압으로 입력시킨다.The DC voltage is divided into predetermined ratios according to the ratios of the resistors R2, R3, and the variable resistor VR1 of the distribution unit 4, and the divided voltage is divided by the first comparison unit 5 and the second comparison unit. Input is made with the comparative voltage of the negative unit 7.

제1비교부(5)의 제1비교기(OP1)에서는 정전압 다이오드(ZD1) 및 가변저항(VR2)에 의해 일정한 기준전압과 상기의 분할 전압을 비교하여 분할 전압이 큰 경우에만 L를 출력하고, 이에따라 표시부(6)의 발광다이오드(LED)가 점등시켜 과전류가 인가되고 있음을 외부로 알려준다.The first comparator OP1 of the first comparator 5 compares the constant reference voltage with the divided voltage by the constant voltage diode ZD1 and the variable resistor VR2 and outputs L only when the divided voltage is large. Accordingly, the light emitting diode LED of the display unit 6 lights up to inform the outside that an overcurrent is being applied.

그리고 제2비교부(7)의 제2비교기(OP2)에서는 정전압 다이오드(ZD2) 및 가변저항(VR3)에 의해 항상 일정한 기준전압(여기서 제2비교기의 기준전압은 제1비교기의 기준전압보다 다소 크게 설정함)과 상기의 분할 전압을 비교하여 분할 전압이 큰 경우에만 L를 출력한다.In the second comparator OP2 of the second comparator 7, the constant reference voltage is always constant by the constant voltage diode ZD2 and the variable resistor VR3 (where the reference voltage of the second comparator is somewhat smaller than the reference voltage of the first comparator). L) is output only when the divided voltage is large by comparing the divided voltage with the above divided voltage.

상기 제2비교기(OP2)에서 과전류를 인식하면 이는 큰 과전류가 입력되는 상태이고, 이 출력은 제2비교기(OP2)로 부귀환부(8)의 정전압 다이오드(ZD3), (ZD4)를 거쳐 부귀환되므로 외부 또는 내부의 정전기등으로 인한 노이즈에 강하게 된다.When the second comparator OP2 recognizes an overcurrent, a large overcurrent is input, and this output is negatively fed back through the constant voltage diodes ZD3 and ZD4 of the negative feedback unit 8 to the second comparator OP2. Therefore, it becomes strong against noise caused by static electricity from outside or inside.

그리고 상기 제2비교기(OP2)의 출력은 L는 인터페이스부(9)의 인버터(I)를 거쳐 마이크로 프로세서(10)에 과전류가 입력되고 있음을 알려주는 동시에 앤드게이트(A)의 일측으로 인가 되므로 상기 마이크로 프로세서(10)로 부터 전원을 공급하는 시간의 여부에 따라 출력되는 동작제어신호가 타측으로 인가되는 앤드게이트(A)에서 과전류가 인가되거나, 전원공급시간이 아닌 경우에 스위칭회로로 L를 제어신호로 출력한다.Since the output of the second comparator OP2 indicates that an overcurrent is being input to the microprocessor 10 via the inverter I of the interface unit 9, it is applied to one side of the AND gate A. When an overcurrent is applied from the AND gate A to which the operation control signal output from the microprocessor 10 is applied to the other side or the power supply time is not supplied, L is switched to the switching circuit. Output as a control signal.

따라서 본 고안의 전자식 타임스위치의 과전류 검출회로는 공급되는 AC전원의 전류를 검출하여 과전류 상태임을 외부로 알려주는 동시에 이보다 다소 큰 과전류가 인가될때 마이크로 프로세서에 알리면서 스위칭회로로 제어신호를 출력하도록 한 것으로써 퓨우즈를 사용하지 않고 입력되는 전류의 노이즈에 강하고 안정된 동작을 행하는 것임을 알 수 있다.Therefore, the overcurrent detection circuit of the electronic time switch of the present invention detects the current of the supplied AC power source and notifies the outside of the overcurrent state, and notifies the microprocessor when a slightly larger overcurrent is applied, and outputs a control signal to the switching circuit. As a result, it can be seen that a strong and stable operation is performed against the noise of the input current without using a fuse.

Claims (1)

부하(1)로 공급되는 AC전원의 전류를 변류기(2)를 통해 검출하여 전류-전압변환부(3)에서 직류전압으로 변화시킨 후 기준전압과 비교하여 과전류의 여부를 마이크로 프로세서(10)에 전달하도록 한 전자식 타임스위치의 과전류 검출회로에 있어서, 상기의 직류전압이 분배부(4)의 저항(R1)(R2) 및 가변저항(VR1)에 의해 소정의 비율로 분배된 분할전압이 비교전압으로 입력되는 제1비교기(OP1)에서 제2비교기(OP2)보다 작은 기준전압과 비교하여 과전류인 경우 표시부(6)의 발광다이오드(LED)를 점등시키는 제1비교부(5)와, 상기의 분할전압을 비교전압으로 입력받으면서 부귀환부(8)의 정전압 다이오드(ZD3)(ZD4)를 통해 부귀환되는 제2비교기(OP2)에서 제1비교기(OP1)보다 큰 기준전압과 비교하여 마이크로 프로세서(10)에 출력하는 제2비교구(7)로 구성됨을 특징으로 하는 전자식 타임스위치의 과전류 검출회로.The current of the AC power supplied to the load 1 is detected through the current transformer 2, changed from the current-voltage converting section 3 to a DC voltage, and then compared to the reference voltage to determine whether an overcurrent exists in the microprocessor 10. In the overcurrent detection circuit of an electronic time switch configured to transmit, the divided voltage in which the DC voltage is divided by a predetermined ratio by the resistors R1 (R2) and the variable resistor VR1 of the distribution unit 4 is a comparison voltage. The first comparator 5 for turning on the light emitting diode LED of the display unit 6 in the case of an overcurrent compared to the reference voltage smaller than the second comparator OP2 in the first comparator OP1 input to The second processor OP2, which is negatively feedbacked through the constant voltage diodes ZD3 and ZD4 of the negative feedback unit 8 while receiving the divided voltage as a comparison voltage, is compared with a reference voltage that is larger than the first comparator OP1. It characterized in that it comprises a second comparative phrase (7) output to 10) Electronic current switch over current detection circuit.
KR2019930004725U 1993-03-29 1993-03-29 Over current detecting circuit for electronic time switch KR0128143Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019930004725U KR0128143Y1 (en) 1993-03-29 1993-03-29 Over current detecting circuit for electronic time switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019930004725U KR0128143Y1 (en) 1993-03-29 1993-03-29 Over current detecting circuit for electronic time switch

Publications (2)

Publication Number Publication Date
KR940023208U KR940023208U (en) 1994-10-22
KR0128143Y1 true KR0128143Y1 (en) 1999-03-20

Family

ID=19352789

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019930004725U KR0128143Y1 (en) 1993-03-29 1993-03-29 Over current detecting circuit for electronic time switch

Country Status (1)

Country Link
KR (1) KR0128143Y1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102069614B1 (en) * 2019-11-12 2020-01-23 (주)세명이앤씨 Switchboard with secondary open monitoring of current transformer
KR102116030B1 (en) * 2020-01-10 2020-05-28 (주)세명이앤씨 Switchboard with secondary open monitoring of current transformer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108736567B (en) * 2018-06-29 2024-02-09 国家电网有限公司 Power supply system for power monitoring

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102069614B1 (en) * 2019-11-12 2020-01-23 (주)세명이앤씨 Switchboard with secondary open monitoring of current transformer
KR102116030B1 (en) * 2020-01-10 2020-05-28 (주)세명이앤씨 Switchboard with secondary open monitoring of current transformer

Also Published As

Publication number Publication date
KR940023208U (en) 1994-10-22

Similar Documents

Publication Publication Date Title
EP1282231B1 (en) Load control system having an overload protection circuit
EP2372856A1 (en) Load circuit protection device
US8773023B2 (en) LED traffic signal with synchronized power pulse circuit
JP2006254566A (en) Undervoltage alarm method and circuit, and switching power supply
JPH02280209A (en) Tap switching ac power stabilizer
KR0128143Y1 (en) Over current detecting circuit for electronic time switch
KR100355037B1 (en) World Wide Power Supply Apparatus
RU2157037C1 (en) Load input power limiter
JPH08182315A (en) Switching power source
JP2000133473A (en) Two-wire type wiring tool
US6982858B2 (en) Electronic power-saving power control circuit
KR100697207B1 (en) Sources circuit of controlling plasma display panel' output voltage
RU2206936C2 (en) Lighting control unit
JPH1155877A (en) Two-wire type wiring apparatus
KR100978093B1 (en) LED lamp connection circuit of fluorescent lamp
CN220382752U (en) Inverter circuit, inverter and energy storage power supply
KR950006884Y1 (en) Multi-function breaker
JP2000340373A (en) Lighting system
SU604202A1 (en) Device for regulating illumination in rooms
GB2263592A (en) Improving stability of power supply system voltage by controlling timing of increase/decrease in power consumption of a load
KR930007552Y1 (en) Inverter circuit
KR0122890Y1 (en) Complex protection circuit for motor control
KR0140020Y1 (en) Output current limiting circuit
KR920000256Y1 (en) Over current protective circuit
KR200341367Y1 (en) Lamps for fire fighting having function of power saving

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
REGI Registration of establishment
FPAY Annual fee payment

Payment date: 20070731

Year of fee payment: 10

EXPY Expiration of term