KR100864892B1 - Electric surge counter - Google Patents

Electric surge counter Download PDF

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KR100864892B1
KR100864892B1 KR1020070104046A KR20070104046A KR100864892B1 KR 100864892 B1 KR100864892 B1 KR 100864892B1 KR 1020070104046 A KR1020070104046 A KR 1020070104046A KR 20070104046 A KR20070104046 A KR 20070104046A KR 100864892 B1 KR100864892 B1 KR 100864892B1
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South Korea
Prior art keywords
surge
parallel
counter
protection device
pcb
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KR1020070104046A
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Korean (ko)
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김정수
정태훈
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김정수
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    • 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
    • G01R19/17—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values giving an indication of the number of times this occurs, i.e. multi-channel analysers
    • 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
    • G01R19/145—Indicating the presence of current or voltage
    • G01R19/155—Indicating the presence of voltage
    • 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
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

A surge counter is provided to timely replace an arrester of a surge protector by being installed on a PCB(Printed Circuit Board) parallel to another PCB having the surge protector to count surge introduced into the surge protector. A surge counter includes a surge sensing unit(20) and an electric circuit. The surge sensing unit is composed of a continuous conductor pattern on a second PCB parallel to a first PCB to generate induced voltage due to current changes of input lines(1,2) of a surge protector(10). The electric circuit is driven by the induced voltage of the surge sensing unit. The conductor pattern includes vertical parts vertical to parallel parts which are parallel to the input lines of the surge protector. The second PCB is installed so that the conductor pattern of the parallel parts is parallel to the input lines of the surge protector.

Description

서지 카운터{electric surge counter} Surge counter

도 1은 일반적인 서지 보호장치의 회로기판의 실물 사진이다.1 is a real picture of a circuit board of a general surge protection device.

도 2는 도 1의 서지 보호장치의 회로도이다.FIG. 2 is a circuit diagram of the surge protection device of FIG. 1.

도 3은 본 발명의 서지 카운터가 설치된 서지 보호장치의 회로도이다.3 is a circuit diagram of a surge protection device provided with a surge counter of the present invention.

도 4는 본 발명의 서지 카운터와 서지 보호장치의 회로기판의 실물사진이다.4 is a physical photograph of a circuit board of a surge counter and a surge protection device of the present invention.

도 5는 본 발명의 서지 카운터의 PCB의 평면도이다.5 is a plan view of a PCB of the surge counter of the present invention.

도 6은 본 발명의 서지 카운터의 PCB의 저면도이다.6 is a bottom view of a PCB of the surge counter of the present invention.

본 발명은 통신선로 또는 전기선로에 설치되는 서지보호장치에 유입되는 서지를 카운트하는 서지 카운터에 관한 것이다.The present invention relates to a surge counter for counting surges flowing into a surge protection device installed in a communication line or an electric line.

통신선로 및 전기선로에는 연결된 부하를 보호하기 위하여 본 발명의 출원인에 의하여 특허출원 2006-0028006호(발명의 명칭: 서지보호장치)가 개발되었으며, 출원된 발명의 서지보호장치는 도 1, 2에 도시된 바와 같다.The patent application 2006-0028006 (name of the invention: surge protection device) was developed by the applicant of the present invention to protect the connected load in the communication line and the electric line, the surge protection device of the present invention is shown in FIGS. As shown.

도시된 서지 보호장치에서 입력단(L1)과 출력단(L1')으로 이루어진 라인(L1L1')과 입력단(L2)과 출력단(L2')으로 이루어진 라인(L2L2')으로 이루어진 통신선로의 라인(L1L1')과 라인(L2L2') 사이에는 충진형 3극관 어래스터(AR3), (AR4)가 병렬로 설치되며, 입력단(L1)과 어래스터(AR3)의 접촉단자(AR3-a) 사이에는 퓨우즈(F1)이 설치되고, 입력단(L2)과 어래스터(AR3)의 접촉단자(AR3-b) 사이에는 퓨우즈(F2)가 설치된다.In the illustrated surge protection device, a line L1L1 'consisting of a line L1L1' consisting of an input L1 and an output L1 'and a line L2L2' consisting of an input L2 and an output L2 '. ) And line (L2L2 ') are filled in parallel with the three-pole tube raster (AR3), (AR4), the fuse between the input terminal (L1) and the contact terminal (AR3-a) of the raster (AR3) A F1 is provided, and a fuse F2 is provided between the input terminal L2 and the contact terminal AR3-b of the raster AR3.

이와 같은 서지보호장치는 입력단(L1), (L2)에 서지가 유입되어 출력단(L1'), (L2')로 유출될 때 핵심부품인 어래스터(AR3), (AR4)에서 서지를 흡수하여 억제함으로써 출력단(L1'), (L2')에 연결된 부하를 보호한다. Such surge protection device absorbs the surge from the core parts of the raster (AR3) and (AR4) when the surge flows into the input terminals (L1) and (L2) and flows out to the output terminals (L1 ') and (L2'). By suppressing, the load connected to the output terminals L1 'and L2' is protected.

또한, 서지보호장치에 설치되는 어래스터(AR3), (AR4)는 서지를 흡수한 횟수가 적정횟수 이상이면 성능이 저하되어 서지흡수가 불량하기 때문에 부하를 파손시킨다. 따라서, 적정횟수의 서지가 유입되게 되면 어래스터를 교체해 주어야 한다. 그러나, 통신선로의 서지보호장치는 극히 소형이기 때문에 적정한 서지검출 소자를 설치하기가 곤란하여 통상적으로 서지 카운터를 사용하지 않고, 설치시간을 계산하여 일정 사용시간마다 교체해주는 실정이다. 따라서, 많은 서지가 유입되는 선로나 서지의 유입이 적은 선로도 동일한 시간마다 교체해주기 때문에 불합리한 결과를 초래하였다.In addition, the rasters AR3 and AR4 provided in the surge protection device degrade the performance when the number of times the surge is absorbed is more than the proper number of times, and thus the load is damaged because the surge absorption is poor. Therefore, when the proper number of surges are introduced, the raster must be replaced. However, since the surge protection device of the communication line is extremely small, it is difficult to install an appropriate surge detection element. Therefore, the surge protection device is usually used without a surge counter, and the installation time is calculated and replaced at regular use times. Therefore, it is unreasonable to replace a line that has many surges or a line that has few surges at the same time.

본 발명은 이러한 기술적 과제를 해결하기 위한 것으로, 본 발명의 목적은 서지보호장치에 유입되는 서지전류를 소형의 감지수단으로 감지하도록 하고, 이를 카운팅하도록 하는 서지 카운터를 제공하기 위한 것이다. The present invention is to solve this technical problem, an object of the present invention is to provide a surge counter to detect the surge current flowing into the surge protection device with a small sensing means, and to count it.

상기 목적을 달성하기 위한 본 발명의 구체적인 특징은 PCB 기판(11) 상에 설치된 서지보호장치에 유입되는 서지의 유입횟수를 카운트하는 서지 카운터에 있어서: 상기 PCB 기판(11)에 평행하게 설치되는 제2 PCB 기판(101)에 연속된 도선 패턴으로 이루어져 상기 서지보호장치의 입력선의 전류변화에 의하여 유기전압을 발생시키는 서지 감지부; 상기 서지 감지부의 유기전압에 의하여 구동되며, 구동되는 횟수를 카운트 하는 전기회로를 포함하며, 상기 도선 패턴은 상기 서지보호장치의 상기 입력선과 평행인 평행부분과 수직인 수직부분을 포함하며, 상기 입력선에 상기 평행부분의 도선 패턴이 평행되도록 상기 제2 PCB기판(101)을 설치하는 것이다.A specific feature of the present invention for achieving the above object is a surge counter for counting the number of times of inflow of the surge flowing into the surge protection device installed on the PCB substrate (11): a second parallel to the PCB substrate (11) A surge detection unit having a conductive pattern continuous to the PCB substrate 101 to generate an induced voltage by a current change of an input line of the surge protection device; And an electrical circuit driven by an induced voltage of the surge sensing unit and counting the number of times of driving, wherein the conducting pattern includes a parallel portion parallel to the input line of the surge protection device and a vertical portion perpendicular to the input line. The second PCB substrate 101 is installed so that the conductive pattern of the parallel portion is parallel to the line.

또한, 본 발명에서 상기 전기회로는 상기 서지 감지부의 유기전압을 정류하는 정류부; 상기 정류부로부터 정류된 전압에 의하여 서지신호를 발생하는 서지신호 발생부; 상기 서지신호 발생부로부터 발생된 신호에 의하여 카운트하는 카운트부를 포함하는 것이 바람직하다.In addition, the electric circuit in the present invention includes a rectifier for rectifying the induced voltage of the surge detection unit; A surge signal generator for generating a surge signal by the voltage rectified from the rectifier; It is preferable to include a counting unit for counting by the signal generated from the surge signal generator.

삭제delete

또한, 본 발명에서 상기 제2 PCB(101)은 상, 하면에 상기 도선 패턴들이 대칭되도록 형성되는 것이 바람직하다.In addition, in the present invention, the second PCB 101 is preferably formed so that the conductive patterns are symmetrical on the upper and lower surfaces.

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 3에 도시된 바와 같이, 서지보호장치(10)는 입력단(L1), (L2)과 입력선(1), (2)로 연결되며, 출력단(L1'), (L2')과 출력선(3), (4)으로 연결된다. 또한, 입력선(1), (2)에는 서지 카운터의 서지감지부(20)가 설치된다. 서지보호장치(10)는 도 1, 2에 도시된 공지의 장치로서 서지흡수 소자인 어래스터들(AR3), (AR4)이 설치되고, 어래스터들의 접지단자에는 접지선(GND), (GND')이 연결된다.As shown in FIG. 3, the surge protection device 10 is connected to the input terminals L1 and L2 and the input lines 1 and 2, and the output terminals L1 ', L2' and the output line. Connected to (3) and (4). In addition, the surge detection unit 20 of the surge counter is provided in the input lines 1 and 2. The surge protection device 10 is a known device shown in Figs. 1 and 2 and is provided with the surge absorbing elements asterisks AR3 and AR4, and the ground terminals GND and GND 'of the ground terminals of the asterisks. ) Is connected.

또한, 서지 카운터는 입력선(1), (2)의 상부에 설치되는 두 개의 인덕터(21), (22)로 이루어진 서지 감지부(20)와, 서지 감지부(20)로부터 유기되는 전압을 정류하기 위한 정류부(30), 정류부(10)의 출력전압에 의하여 카운터 신호를 발생시키는 신호발생부(40), 신호발생부(40)로부터 발생된 카운터 신호에 의하여 카운팅을 수행하는 카운터부(50)로 이루어진다.In addition, the surge counter measures a voltage induced from the surge sensing unit 20 and the surge sensing unit 20 including two inductors 21 and 22 provided on the input lines 1 and 2. Rectifier 30 for rectifying, the signal generator 40 for generating a counter signal by the output voltage of the rectifier 10, the counter unit 50 for performing the counting by the counter signal generated from the signal generator 40 )

이때, 신호발생부(40)는 정류부(30)의 출력단자들 사이에 연결된 포토 다이오드(PD1)와 전류 제한 저항(R1)과, 카운터부(50)의 입력단자들 사이에 연결되며 포토 다이오드(PD1)로부터 발광된 빛을 수광하면 도통되어 카운터부(50)가 카운트하도록 하는 포토 트랜지스터(TR1)로 이루어진다.At this time, the signal generator 40 is connected between the photodiode PD1 and the current limiting resistor R1 connected between the output terminals of the rectifying unit 30 and the input terminals of the counter unit 50. When the light emitted from the PD1 is received, the photoconductor TR1 is configured to be turned on so that the counter 50 counts.

또한, 카운터부(50)는 포토 트랜지스터(TR1)가 도통되는 횟수에 따라서 카운터를 증가시키는 회로와 카운트된 수를 외부에 표시하는 표시부를 구비하는 것으로 이는 통상적인 공지의 구성으로 설명을 약하기로 한다.In addition, the counter unit 50 includes a circuit for increasing the counter according to the number of times the photo transistor TR1 is conducted, and a display unit for displaying the counted number to the outside. .

또한, 서지 감지부(20)는 다수의 인덕터(inductor)로 구성될 수 있으며, 도 3에는 두 개의 인덕터(21), (22)의 구성을 도시한다. In addition, the surge sensing unit 20 may be composed of a plurality of inductors, and FIG. 3 illustrates the configuration of two inductors 21 and 22.

도 4, 5, 6에 도시된 바와 같이 인덕터(21), (22) 각각에서 유기되는 전압은 상호 가산되도록 도선 패턴으로 PCB 기판(101)에 인쇄되며, 이들 인덕터(21), (22)는 입력선(1), (2)과 서지보호장치(10)가 설치된 PCB 기판(11)과 이격되게 평행하게 설치된 PCB 기판(101)에 형성된다. 인덕터(21), (22)는 PCB 기판(101)의 일면에 형성될 수 있으나 PCB 기판(101)의 소형화를 위하여 PCB 기판(101)의 상면, 하면에 대칭되게 형성된다. 이때, 인덕터(21), (22)를 형성하는 도선 패턴은 입력선(1), (2)에 대하여 수직부분(26), (27)과 수평부분(24), (25) 및 경사진 곡선부분(28), (29)으로 이루어지나, 입력선(1), (2)이 수직부분(26), (27)의 도선 패턴 각각과 수직으로 통과하게 되면, 수직부분(26)의 유기전압과 수직부분(27)의 유기전압의 극성이 극성이 서로 반대되어 유기전압이 상쇄된다. 따라서 평행부분(24)의 도선패턴과 입력선(1)이 평행하도록 배치하고, 평행부분(25)의 도선패턴과 입력선(2)이 평행하도록 배치하여야한다.As shown in Figs. 4, 5 and 6, the voltages induced in each of the inductors 21 and 22 are printed on the PCB substrate 101 in a conductive pattern so as to be added to each other, and these inductors 21 and 22 are The input lines 1, 2, and the surge protection device 10 are formed on the PCB substrate 101 disposed parallel to the PCB substrate 11 spaced apart from each other. The inductors 21 and 22 may be formed on one surface of the PCB substrate 101, but are formed symmetrically on the upper and lower surfaces of the PCB substrate 101 in order to miniaturize the PCB substrate 101. At this time, the conducting wire patterns forming the inductors 21 and 22 are vertical portions 26 and 27 and horizontal portions 24 and 25 and inclined curves with respect to the input lines 1 and 2. It is composed of portions 28 and 29, but when the input lines 1 and 2 pass perpendicularly to the conductive patterns of the vertical portions 26 and 27, the induced voltage of the vertical portion 26 The polarities of the induced voltages of the and vertical portions 27 are opposite in polarity to cancel the induced voltages. Therefore, the conductor pattern of the parallel part 24 and the input line 1 should be arranged in parallel, and the conductor pattern of the parallel part 25 and the input line 2 should be arranged in parallel.

또한, 입력단(L1), (L2)과 서지보호장치(10) 사이의 입력선(1), (2)에 서지가 흐르며, 서지보호장치(10)와 출력단(L1'), (L2') 사이의 출력선(3), (4)에는 서지보호장치(10)에 의하여 서지가 억제된 정상전류가 흐르기 때문에 인덕터(21), (22)는 입력단(L1), (L2)과 서지보호장치(10) 사이에 입력선(1), (2)의 상부에 설치되어야 한다. 이때, 인덕터(21), (22)는 서지보호장치(10)의 입력선의 하부에 설치되는 경우에도 마찬가지의 결과를 가져온다.In addition, surges flow through the input lines 1 and 2 between the input terminals L1, L2 and the surge protection device 10, and the surge protection device 10 and the output terminals L1 ', L2'. The inductors 21 and 22 are connected to the input terminals L1, L2 and the surge protection device because the normal currents in which the surge is suppressed by the surge protection device 10 flow through the output lines 3 and 4 therebetween. It should be installed on top of the input lines (1) and (2) between (10). At this time, the inductors 21 and 22 have the same result even when they are provided below the input line of the surge protection device 10.

또한, PCB 기판(101)에는 정류부(30), 신호 발생부(40), 카운터부(50)가 설치도록 하여 서지 카운터가 하나의 기판상에 제작도록 하고, 서지보호장치(10)가 하나의 기판상에 제작되도록 하여 이들을 결합함으로써 작업공정을 단순화시키는 것이 바람직하다.In addition, the rectifier 30, the signal generator 40, and the counter 50 are installed on the PCB substrate 101 so that the surge counter is fabricated on one substrate, and the surge protection device 10 is one. It is desirable to simplify the work process by combining them by allowing them to be fabricated on a substrate.

이하, 본 발명의 동작과정에 대하여 설명하기로 한다.Hereinafter, an operation process of the present invention will be described.

입력선(1), (2)를 통하여 서지보호장치(10)에 서지가 유입되게 되면, 입력선(1), (2)에 과도전압이 흐르게 되고, 이 과도전압은 서지 감지부(20)를 구성하는 인덕터(21), (22)에 각각 유기전압을 유도하고, 각각의 유기전압은 합해져 정류부(30)에 유입된 후 정류된 전압을 포토 다이오드(PD1)를 동작시킨다. 이와 같이, 포토 다이오드에 전압이 인가되면 광을 발산하여 포토 트랜지스터(TR1)를 도통되며, 카운터부(50)는 포토 트랜지스터(TR1)의 도통시마다 카운트를 하여 표시부에 카운트된 수를 표시한다.When a surge flows into the surge protection device 10 through the input lines 1 and 2, a transient voltage flows through the input lines 1 and 2, and the transient voltage is transmitted to the surge sensing unit 20. The induced voltages are respectively induced to the inductors 21 and 22 constituting the above, and the induced voltages are added to the rectifier 30 to operate the photodiode PD1. As such, when a voltage is applied to the photodiode, light is emitted to conduct the photo transistor TR1, and the counter 50 counts each time the photo transistor TR1 conducts and displays the counted number on the display unit.

상기의 목적과 구성을 갖는 본 발명에 따르면, 서지보호장치가 설치된 PCB 기판(11)에 평행인 PCB 기판(101)에 서지 카운터를 구성하고, 서지보호장치에 유입되는 서지를 서지카운터가 카운트하도록 함으로써 서지보호장치의 어래스터를 적절한 시기에 교체할 수 있다.According to the present invention having the above object and configuration, a surge counter is formed on the PCB substrate 101 parallel to the PCB substrate 11 on which the surge protection device is installed, so that the surge counter counts the surge flowing into the surge protection device. This allows the surge arresters to be replaced at the right time.

또한, 서지 카운터의 서지 감지부를 구성하는 복수의 인덕터를 PCB 기판(101)의 상, 하면에 형성함으로써 크기를 대폭 감소시킬 수 있다.In addition, by forming a plurality of inductors constituting the surge sensing unit of the surge counter on the upper and lower surfaces of the PCB substrate 101, the size can be greatly reduced.

Claims (4)

PCB 기판(11) 상에 설치된 서지보호장치에 유입되는 서지의 유입횟수를 카운트하는 서지 카운터에 있어서:In the surge counter for counting the number of times the surge flows into the surge protection device installed on the PCB board (11): 상기 PCB 기판(11)에 평행하게 설치되는 제2 PCB 기판(101)에 연속된 도선 패턴으로 이루어져 상기 서지보호장치의 입력선의 전류변화에 의하여 유기전압을 발생시키는 서지 감지부;A surge sensing unit formed of a conductive pattern continuous to the second PCB substrate 101 installed in parallel with the PCB substrate 11 to generate an induced voltage by a current change of an input line of the surge protection device; 상기 서지 감지부의 유기전압에 의하여 구동되며, 구동되는 횟수를 카운트 하는 전기회로를 포함하며,It is driven by the induced voltage of the surge detection unit, and includes an electric circuit for counting the number of times driven, 상기 도선 패턴은 상기 서지보호장치의 상기 입력선과 평행인 평행부분과 수직인 수직부분을 포함하며, 상기 입력선에 상기 평행부분의 도선 패턴이 평행되도록 상기 제2 PCB기판(101)을 설치하는 것을 특징으로 하는 서지 카운터.The lead pattern may include a vertical portion parallel to the input line parallel to the input line of the surge protection device, and the second PCB substrate 101 may be installed on the input line such that the lead pattern of the parallel portion is parallel to the input line. Surge counter characterized by the above. 청구항 1에서, 상기 전기회로는 상기 서지 감지부의 유기전압을 정류하는 정류부;The electric circuit of claim 1, wherein the electric circuit comprises: a rectifier configured to rectify an induced voltage of the surge sensing unit; 상기 정류부로부터 정류된 전압에 의하여 서지신호를 발생하는 서지신호 발생부;A surge signal generator for generating a surge signal by the voltage rectified from the rectifier; 상기 서지신호 발생부로부터 발생된 신호에 의하여 카운트하는 카운트부를 포함하는 것을 특징으로 하는 서지 카운터.And a counting unit for counting the signals generated from the surge signal generating unit. 삭제delete 청구항 1에서, 상기 제2 PCB(101)은 상, 하면에 상기 도선 패턴들이 대칭되도록 형성되는 것을 특징으로 하는 서지 카운터.The surge counter of claim 1, wherein the second PCB (101) is formed so that the conductive patterns are symmetrical on the upper and lower surfaces.
KR1020070104046A 2007-10-16 2007-10-16 Electric surge counter KR100864892B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101720126B1 (en) * 2016-05-17 2017-03-27 진화전기통신주식회사 Recommendation apparatus for changing surge protector
KR101801798B1 (en) * 2017-03-22 2017-11-27 진화전기통신(주) Surge protector having replacement recommendation function for internal deterioration
KR101801799B1 (en) * 2017-03-22 2017-11-27 진화전기통신(주) Surge protector apparatus having replacement recommendation function for internal deterioration
KR101801797B1 (en) * 2017-03-22 2017-12-20 진화전기통신(주) Replacement recommendation apparatus for internal deterioration of surge protector
US10050435B2 (en) 2015-02-03 2018-08-14 Philips Lighting Holding B.V. Driver circuit able to monitor usage of a surge protection arrangement

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KR20050081469A (en) * 2004-02-13 2005-08-19 학교법인 건국대학교 Digital surge protector
KR20070018652A (en) * 2005-08-09 2007-02-14 주식회사 두원 High precise and miniaturized current transformer, method for manufacturing the same, trip current circuit and using the same

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KR880008592A (en) * 1986-12-17 1988-08-31 존 이.모울 Surge Protectors for Telecommunication Terminals
KR19990081089A (en) * 1998-04-25 1999-11-15 주국문 Lightning and overvoltage detector
KR20010114120A (en) * 2000-06-21 2001-12-29 안태영 PCB Inductor and Transformer using the PCB Inductor
KR20050081469A (en) * 2004-02-13 2005-08-19 학교법인 건국대학교 Digital surge protector
KR20070018652A (en) * 2005-08-09 2007-02-14 주식회사 두원 High precise and miniaturized current transformer, method for manufacturing the same, trip current circuit and using the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10050435B2 (en) 2015-02-03 2018-08-14 Philips Lighting Holding B.V. Driver circuit able to monitor usage of a surge protection arrangement
KR101720126B1 (en) * 2016-05-17 2017-03-27 진화전기통신주식회사 Recommendation apparatus for changing surge protector
KR101801798B1 (en) * 2017-03-22 2017-11-27 진화전기통신(주) Surge protector having replacement recommendation function for internal deterioration
KR101801799B1 (en) * 2017-03-22 2017-11-27 진화전기통신(주) Surge protector apparatus having replacement recommendation function for internal deterioration
KR101801797B1 (en) * 2017-03-22 2017-12-20 진화전기통신(주) Replacement recommendation apparatus for internal deterioration of surge protector

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