KR20020028128A - static switch sensing gate signal - Google Patents
static switch sensing gate signal Download PDFInfo
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- KR20020028128A KR20020028128A KR1020000059063A KR20000059063A KR20020028128A KR 20020028128 A KR20020028128 A KR 20020028128A KR 1020000059063 A KR1020000059063 A KR 1020000059063A KR 20000059063 A KR20000059063 A KR 20000059063A KR 20020028128 A KR20020028128 A KR 20020028128A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to mechanical injury, e.g. rupture of line, breakage of earth connection
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- 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
- H02H7/122—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 inverters, i.e. dc/ac converters
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- 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
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
Description
본 발명은 무정전전원장치(UPS: Uninterruptible Power Supply)의 무순단절환장치(STATIC SWITCH)에 관한 것으로, 보다 상세하게는 무정전전원장치는 정전시 배터리(BATTERY) 전원을 이용하고 인버터 이상시 동기상태에서 무순단 절환을 필요로 함으로 게이트 신호를 감지한 무순단 절환장치를 무정전전원장치에 적용하여 공장자동화 및 사무자동화를 이루고 있는 현장에서 보다높은 신뢰성과 안정된 전원이 보장될 수 있도록 한 무순단 절환장치에 관한 것이다.The present invention relates to an uninterruptible power supply (STATIC SWITCH) of an uninterruptible power supply (UPS), and more particularly, the uninterruptible power supply uses a battery power in the event of a power failure and in a synchronous state when the inverter malfunctions. It requires no-switching, so that the non-switching switch that detects the gate signal is applied to the uninterruptible power supply, so that more reliable and stable power can be guaranteed at the site of factory and office automation. It is about.
도 1 은 종래의 무정전전원장치에서 사용돠어온 무순단절환장치의 타이밍 챠트로 바이패스 스위치(25), 인버터 스위치(26)의 게이트 신호가 정상적으로 동작하고 있는때는 출력(27)이 끊김없이 동작되지만 바이패스 스위치(25), 인버터 스위치(26) 두쪽모두 신호가 없으면 출력(27)이 끊어지는 것을 보여준다.1 is a timing chart of an uninterruptible switching device that has been used in a conventional uninterruptible power supply. When the bypass signals of the bypass switch 25 and the inverter switch 26 are normally operated, the output 27 operates without interruption. Both bypass switch 25 and inverter switch 26 show that output 27 is disconnected if there is no signal.
또한 무정전전원장치는 정전 및 순시 전압저하 등 각종 전원장해에 대비하여 산업현장에서 자동화설비를 갗추고 있는 곳에서는 필수적으로 사용되고 있으며 이렇게 전원장해에 대비하여 설치한 무정전전원장치가 고장으로 인하여 설비사고를 일으키는 사례가 간헐적으로 발생되고 있는것이 현실이다.In addition, the uninterruptible power supply is indispensable in places where automation facilities are installed in industrial fields in preparation for various power failures such as power failure and instantaneous voltage drop.The uninterruptible power supply installed in preparation for power failure causes equipment accidents due to failure. The reality is that cases are occurring intermittently.
전원공급불가의 원인은 대부분 INVERTER 이상으로 BY-PASS로 자동절환이 이루어져야 하는데 절환이 되지않는 다거나 절환장치의 내부적인 제어전원 이상이나 부품열화로 인하여 전원공급이 중단되는 사례가 대부분을 차지하고 있다.Most of the causes of power supply failure are automatic switching to BY-PASS due to the error of INVERTER. Most of the cases are that the power supply is interrupted due to abnormal switching power supply or parts deterioration.
또한 무정전전원장치라 함은 상시 인버터(INVERTER) 운전중 설비이상 발생시 무순단으로 상용전원(BY-PASS)으로 절체되어 설비에 전혀 영향을 주어서는 안되는 시스템으로 구성되어야 하나 종래의 장치에서는 무순단절체는 가능토록 구성되어 있었으나 고장시에 대비한 대책은 전무한 상태였기 때문에 절환장치 고장발생시에는 전원공급이 불가하였다.In addition, the uninterruptible power supply should be composed of a system that is changed to the commercial power (BY-PASS) without any effect when the equipment malfunctions during the operation of the inverter at all times, and does not affect the equipment at all. Was configured to be possible, but there was no countermeasure in case of breakdown, so power supply was not possible in the event of a breaker failure.
특히 절환제어카드의 제어 전원이 끊어지게 되면 인버터가 운전상태에 있다하더라도 스위치 기능이 상실되어 전원공급이 불가 하였으며 또한 절환제어카드 자체 이상으로 게이트 펄스(GATE PULSE)가 발생되지 않을 경우 전원공급이 불가하여 설비사고로 이어져 왔다.In particular, if the control power of the switching control card is cut off, even if the inverter is in operation, the switch function is lost and power supply is not possible. Also, if the gate pulse is not generated due to the switching control card itself, the power supply is impossible. This has led to equipment accidents.
본 발명은 상기와 같은 종래의 문제점을 해결하기 위한 것으로, 무정전 전원장치 고장에 따른 전원공급 중단사태가 발생되지 않도록 기존의 무순단절환장치에 어떠한 상황에서도 바이패스로 자동절환 되는것은 물론 인버터 스위치 및 바이패스 스위치에서 전원공급을 할 수 없을 때 비상라인으로 자동절환이 될 수 있도록 게이트 신호를 감지한 순단방지 시스템으로 절환실패에 따른 설비사고 사례가 발생되지 않도록 함으로서 산업현장에서 전원장치 이상에 의한 설비중단을 방지하도록 하는데 그 목적이 있다.The present invention is to solve the conventional problems as described above, the automatic switch to the existing uninterruptible switching device in any situation to avoid the power supply interruption caused by the uninterruptible power supply failure, as well as the inverter switch and When the power supply cannot be supplied from the bypass switch, it is a simple prevention system that detects the gate signal so that the system can be automatically switched to the emergency line. The purpose is to prevent interruptions.
도 1 은 종래의 절환장치의 타이밍 챠트.1 is a timing chart of a conventional switching device.
도 2 는 본 발명에 적용되는 무정전전원장치의 회로도.2 is a circuit diagram of an uninterruptible power supply device applied to the present invention.
도 3 은 본 발명 파워 회로도.3 is a power circuit diagram of the present invention.
도 4 는 본 발명 제어카드의 회로도.4 is a circuit diagram of the control card of the present invention.
도 5 는 본 발명 무순단 절환장치의 타이밍 챠트.Fig. 5 is a timing chart of the inventionless stepless switching device.
<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for main parts of the drawings>
1 : 전원부1의 입력부 2 : 절환신호 입력 3 : 전원부1DESCRIPTION OF SYMBOLS 1 Input part of the power supply part 1 2 Switching signal input 3 Power supply part 1
4 :절환신호 증폭회로 5 : 바이패스 운전 스위칭회로4: Switching signal amplification circuit 5: Bypass operation switching circuit
6 :변환기 운전 스위칭회로 7 : 바이패스 펄스 변환기6: converter operation switching circuit 7: bypass pulse converter
8 :변환기용 펄스 변환기 9 : 바이패스스위치 동작신호 출력8: Pulse converter for converter 9: Bypass switch operation signal output
10 : 변환 스위치 동작신호 출력 11 : 전원부2, 전원부3의 입력10: operation switch output signal of the conversion switch 11: input of the power supply unit 2, power supply unit 3
12 : 절환장치 게이트 펄스 검출 13 : 비상용 전원회로2, 312: Switch gate pulse detection 13: Emergency power supply circuits 2, 3
14 : 비상스위치 동작여부 판단회로 15 : 비상동작 유지회로14: emergency switch operation judgment circuit 15: emergency operation maintenance circuit
16 : 비상동작 표시등 17 : 비상동작 해제 스위치16: emergency operation indicator 17: emergency operation release switch
18 : 비상회로 펄스 발생부 19 : 비상동작 스위칭 증폭회로18: emergency circuit pulse generator 19: emergency operation switching amplifier circuit
20 : 비상회로용 펄스 변환기 21 : 비상회로 게이트신호 출력20: emergency circuit pulse converter 21: emergency circuit gate signal output
22 : 바이패스 전원 23 : 인버터 출력전원 24 : 비상용스위치22: bypass power 23: inverter output power 24: emergency switch
25 : 바이패스 스위치 26 : 인버터 스위치 27 : 무정전전원장치의 최종출력25 Bypass switch 26 Inverter switch 27 Final output of the uninterruptible power supply
이하, 첨부도면을 참조하여 본 발명에 따른 바람직한 실시 예에 대하여 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
본 발명 무순단 절환장치의 실시예는,An embodiment of the invention non-stage switching device,
바이패스 스위치(25)와 인버터 스위치(26)의 게이트 신호가 정상동작시 입력측의 바이패스 전원(22)과 인버터 전원(23)이 공급되어 부하에 전원을 공급하고, 상기 바이패스 스위치(25)와 인버터 스위치(26)의 게이트 신호가 비정상동작시 비상용 스위치(24)의 게이트 신호가 동작되어 정전없이 부하에 전원을 공급함이 바람직하다.When the gate signals of the bypass switch 25 and the inverter switch 26 operate normally, the bypass power source 22 and the inverter power source 23 on the input side are supplied to supply power to the load, and the bypass switch 25 When the gate signal of the inverter switch 26 is abnormally operated, the gate signal of the emergency switch 24 is operated to supply power to the load without power failure.
도 2 는 본 발명에 적용되는 무정전전원장치의 회로도이고, 도 3 은 본 발명 파워 회로도이며, 도 4 는 본 발명 제어카드의 회로도이고, 도 5 는 본 발명 무순단 절환장치의 타이밍 챠트로서, 이를 참조하면 다음과 같다.FIG. 2 is a circuit diagram of an uninterruptible power supply device applied to the present invention, FIG. 3 is a power circuit diagram of the present invention, FIG. 4 is a circuit diagram of the control card of the present invention, and FIG. 5 is a timing chart of the non-switching switching device of the present invention. For reference:
본 발명에 적용되는 도 2 의 무정전전원장치(UPS)의 기본적인 동작을 설명하면 다음과 같다.Referring to the basic operation of the uninterruptible power supply (UPS) of Figure 2 applied to the present invention.
정상모드시는 무정전전원장치에 정상적으로 입력전원이 공급되고있는 상태에서는 ①번 화살표 방향으로 교류(AC) 전원이 입력되면 정류기(RECTIFIER)에서 직류전원으로 변환되어 인버터(INVERTER)에 전원을 공급함과 동시에 배터리에 충전을 한다. 인버터에서는 직류전원을 공급받아 교류로 변환하여 무순단절환장치를 통하여 인버터 전원을 부하에 공급한다.In the normal mode, when AC power is normally supplied to the uninterruptible power supply, when AC power is input in the direction of arrow ①, it is converted into DC power by rectifier and supplies power to the inverter. Charge it. Inverter receives DC power, converts it into AC, and supplies inverter power to the load through an uninterruptible switching device.
입력 정전시는 입력정전 시에는 배터리에 충전된 직류전원을 정상모드에서와 마찬가지로 인버터와 무순단절환장치를 통하여 부하에 인버터 전원을 공급한다.In case of input power failure, in case of input power failure, the inverter supplies power to the load through the inverter and the uninterruptible switching device as in the normal mode.
인버터 정지시는 정상운전중 어떤 원인에 의하여 인버터가 정지하게 되면 무순단 절환장치에서 바이패스로 자동절환하여 부하에 전원을 공급한다When the inverter stops for some reason during normal operation, the inverter automatically switches to bypass from the non-switching switching device and supplies power to the load.
도 3 에서 입력부(1)부분에 제어용 직류전원 85V ∼ 265V가 입력되고 전원부(3)에서 제어전원 DC 12V 로 만들어져 제어용 전원으로 사용되며, 절환신호 입력(2)에는 무정전전원장치 제어 피씨비(CONTROL PCB)로부터 절환신호가 입력된다.In FIG. 3, a control DC power source 85V to 265V is input to the input unit 1 and a control power DC 12V is used in the power supply unit 3 to be used as a control power supply. The control signal input 2 has an uninterruptible power supply control PCB (CONTROL PCB). The switching signal is input from
상기 절환신호는 증폭회로(4)를 거처 바이패스 운전스위칭 회로(5)와 인버터 운전스위칭 회로(6)에 공급되어지며 절환신호증폭회로(4)의 출력신호가 HIGH("1")가 되면 인버터 운전스위칭 회로(6)는 동작을 멈추고 바이패스 스위칭증폭회로(5)가 동작하게 되고, 이로인해 바이패스용 펄스변환기(7), 바이패스스위치 동작신호 출력(9), 도 2 의 동작신호(25)가 동작하게되어 무정전전원장치의 출력에는 바이패스 전원이 공급된다.The switching signal is supplied to the bypass driving switching circuit 5 and the inverter driving switching circuit 6 via the amplifying circuit 4, and when the output signal of the switching signal amplifying circuit 4 becomes HIGH (" 1 "). The inverter operation switching circuit 6 stops the operation and the bypass switching amplifier circuit 5 is operated. As a result, the bypass pulse converter 7, the bypass switch operation signal output 9, and the operation signal of FIG. 2. 25 is operated so that bypass power is supplied to the output of the uninterruptible power supply.
상기 절환신호증폭회로(4)의 출력이 LOW("0")이면 바이패스 운전 스위칭회로(5)는 동작을 멈추고 인버터운전 스위칭회로(6)의 동작과 함께 인버터용 펄스 변환기(8), 인버터 스위치 동작신호 출력(10), 인버터 스위치(26)이 동작하게 되어 인버터 전원이 출력에 공급된다.When the output of the switching signal amplifying circuit 4 is LOW ("0"), the bypass operation switching circuit 5 stops operation and the inverter pulse converter 8 and inverter together with the operation of the inverter operation switching circuit 6. The switch operation signal output 10 and the inverter switch 26 are operated so that inverter power is supplied to the output.
또한 바이패스 게이트 신호(9)와 인버터 게이트 신호(10)가 중단되어 바이패스 스위치(25)와 인버터 스위치(26)의 회로로 전원을 공급 할 수 없게 되었을때는 검출회로(12)에서 게이트 펄스신호를 감시하고 있다가 게이트 신호가 두쪽 모두없어지게 되면 비상동작판단회로(14)에서 비상회로 동작여부를 판단하여 유지회로(15)에 공급한다.In addition, when the bypass gate signal 9 and the inverter gate signal 10 are interrupted so that power cannot be supplied to the circuits of the bypass switch 25 and the inverter switch 26, the gate circuit signal is detected by the detection circuit 12. If the gate signal disappears from both sides, the emergency operation judgment circuit 14 determines whether the emergency circuit is operated and supplies it to the holding circuit 15.
상기 유지회로(15)에서는 비상동작 LED(16) 점등과 함께 펄스 발생부(18)에 공급하고 펄스 발생부(18)에서는 펄스를 발생시키며, 펄스신호는 스위칭증폭부(19)에서 신호가 증폭되어 펄스 변환기회로(20)를 거쳐 비상회로 게이트 출력단자(21)에서 도 2 의 비상 스위치(24)에 게이트신호를 공급해 비상스위치회로(24)가 동작되게하고 비상동작은 리세트(RESET) 스위치(17)를 조작하기 전까지는 계속 유지한다.The holding circuit 15 supplies the pulse generating unit 18 with the emergency operation LED 16 turned on, and generates the pulse in the pulse generating unit 18, and the pulse signal is amplified by the switching amplifier 19. The emergency switch circuit 24 is operated by supplying a gate signal from the emergency circuit gate output terminal 21 to the emergency switch 24 of FIG. 2 via the pulse converter circuit 20, and the emergency operation is a reset switch. Keep holding until you operate (17).
도 5 는 본 발명이 적용된 무순단 절환장치의 타이밍 챠트로 바이패스 스위치(25), 인버터 스위치(26) 게이트신호가 모두 끊어지면 비상용 스위치(24)가 동작되도록 하여 출력(27)은 정전없이 부하에 전원을 공급한다5 is a timing chart of the stepless switching device to which the present invention is applied, so that when the bypass switch 25 and the inverter switch 26 gate signals are all cut off, the emergency switch 24 is operated so that the output 27 is loaded without a power failure. Power on
이상에서 설명한 바와 같이 본 발명에 의하면, 무정전으로 상시 운전이 되어야하는 주요설비인 전산설비나 계장DDC, PLC에 전력을 공급하고있는 무정전전원장치에 적용하면 무정전전원장치 고장에 의한 전원장해를 방지하므로 공장 가동율향상은 물론 생산성향상에 큰 효과가 있다.As described above, according to the present invention, when applied to an uninterruptible power supply that supplies power to the computerized equipment, instrumentation DDC, and PLC, which are the main equipment that should be operated at all times because of the uninterrupted power supply, the power failure due to the uninterruptible power supply is prevented. Not only does it increase plant utilization, it also has a big effect on productivity.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000059063A KR20020028128A (en) | 2000-10-07 | 2000-10-07 | static switch sensing gate signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000059063A KR20020028128A (en) | 2000-10-07 | 2000-10-07 | static switch sensing gate signal |
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| Publication Number | Publication Date |
|---|---|
| KR20020028128A true KR20020028128A (en) | 2002-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020000059063A KR20020028128A (en) | 2000-10-07 | 2000-10-07 | static switch sensing gate signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101009483B1 (en) * | 2010-05-18 | 2011-01-19 | 주식회사 어드밴스드웨이브 | Sag protector |
| KR101443320B1 (en) * | 2013-04-10 | 2014-11-03 | 주식회사 오키 | Emergency line bypass switching circuit and power converter using the bypass switching circuit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR910007225A (en) * | 1989-05-02 | 1991-04-30 | 아오이 죠이찌 | Uninterruptible Power Supply with Overcurrent Protection |
| JPH05300673A (en) * | 1992-04-15 | 1993-11-12 | Toyo Electric Mfg Co Ltd | Uninterruptive power source system |
| JPH08182337A (en) * | 1994-12-26 | 1996-07-12 | Shin Kobe Electric Mach Co Ltd | Method for diagnosing abnormality of inverter circuit of uninterruptible power supply and uninterruptible power supply |
| JPH1127877A (en) * | 1997-07-03 | 1999-01-29 | Sanyo Denki Co Ltd | Uninterruptible power unit |
| KR20020011527A (en) * | 2000-08-02 | 2002-02-09 | 유근영 | An Accident Reporting System of an Un-interrupt Power Supply and It's reporting Method |
| KR100368801B1 (en) * | 2000-08-31 | 2003-01-24 | 주식회사 씨큐어테크 | A security power supply apparatus of uninterruptible |
-
2000
- 2000-10-07 KR KR1020000059063A patent/KR20020028128A/en not_active Application Discontinuation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR910007225A (en) * | 1989-05-02 | 1991-04-30 | 아오이 죠이찌 | Uninterruptible Power Supply with Overcurrent Protection |
| JPH05300673A (en) * | 1992-04-15 | 1993-11-12 | Toyo Electric Mfg Co Ltd | Uninterruptive power source system |
| JPH08182337A (en) * | 1994-12-26 | 1996-07-12 | Shin Kobe Electric Mach Co Ltd | Method for diagnosing abnormality of inverter circuit of uninterruptible power supply and uninterruptible power supply |
| JPH1127877A (en) * | 1997-07-03 | 1999-01-29 | Sanyo Denki Co Ltd | Uninterruptible power unit |
| KR20020011527A (en) * | 2000-08-02 | 2002-02-09 | 유근영 | An Accident Reporting System of an Un-interrupt Power Supply and It's reporting Method |
| KR100368801B1 (en) * | 2000-08-31 | 2003-01-24 | 주식회사 씨큐어테크 | A security power supply apparatus of uninterruptible |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101009483B1 (en) * | 2010-05-18 | 2011-01-19 | 주식회사 어드밴스드웨이브 | Sag protector |
| KR101443320B1 (en) * | 2013-04-10 | 2014-11-03 | 주식회사 오키 | Emergency line bypass switching circuit and power converter using the bypass switching circuit |
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