• 전자공학회논문지D
• /
• 제36D2호
• /
• pp.71-80
• /
• 1999

본 논문에서는 2${\mu}m$ 고전압 CMOS 공정을 사용한 보호 회로를 포함한 전력 ,MOSFET 구동기를 설계하였다. 제어 회로의 안정한 동작을 위하여 전원 관리 회로를 설계하였으며 전원 관리 회로의 전압 레귤레이터의 보호를 위하여 전압 검출 방식의 단락 보호 회로를 제안하였다. 전압 검출 방식(Voltage-Detection Short Circuit Protection; VDSCP)은 직렬 저항에 의한 전압 강하가 없고, 출력단 단락 상태에서 전압원의 전류를 출력단에 흐르지 못하도록 하는 특성이 있다. 전력 MOSFET를 보호하기 위하여 부하 단락 보호회로, 게이트 전압 제한 회로, 과전압 보호 회로를 설계하였으며, 50V의 항목 전압을 닺는 공정을 이용하여 전력 MOSFET 구동기를 위한 2${\mu}m$ 고전압 CMOS 공정을 개발하였다. 전력 MOSFET이 소비하는 전력 이외에 구동기가 소비하는 전력은 전력 MOSFET 구동 상태에 따라 20 ~ 100mW의 범위에 있는 것으로 확인하였다. 주문형으로 제작된 전력 MOSFET 구동기의 active area의 크기는 $3.5 {\times}2..8mm^2$이다.

• 한국조명전기설비학회:학술대회논문집
• /
• 한국조명전기설비학회 2005년도 춘계학술대회논문집
• /
• pp.106-110
• /
• 2005

In this paper, LED traffic signal lamp's operating circuit using Flyback converter and PFC IC has been presented. Most power conversion circuits use PFC IC for Power Factor Correction. The design parameter's value of Flyback converter has been proposed and the error amplifier which regulates the output voltage has been designed Besides, the under voltage protection circuit and the over voltage protection circuit for protecting the operating circuit kin unbalance of common electric power source and the temperature compensation circuit for fixed optical output power have been proposed.

• 한국가스학회:학술대회논문집
• /
• 한국가스학회 2001년도 추계학술발표회 논문집
• /
• pp.45-57
• /
• 2001

An alternating current (AC) corrosion using coupon has been studied. Coupons were applied in terms of AC voltage from high value to low value through the survey of AC voltages on buried gas transmission pipeline over the country. Parameters such as AC current density of coupon, AC voltage, cathodic protection potential, soil resistivity and frequency were monitored continually. Corrosion induced by AC was observed even under cathodically protected condition that met cathodic protection criterion(: below -850mv vs. CSE). Corrosion rate was affected mainly not by AC voltage but by both of frequency and AC current density. An experimental corrosion rate relationship could be obtained statistically, in which AC corrosion rate increased linearly with effective AC current density and its slope was 0.619.

• Corrosion Science and Technology
• /
• 제4권1호
• /
• pp.1-7
• /
• 2005

An alternating current (AC) corrosion on buried pipeline has been studied using coupon and ER probe. Coupons and ER probes were applied to the sites from high value of AC voltage to low value based on the survey of AC voltages on buried gas transmission pipeline over the country. Parameters such as AC current density of coupon, AC voltage, cathodic protection potential, soil resistivity and frequency were monitored continually. Corrosion induced by AC was observed even under cathodically protected condition that met cathodic protection criterion (; below -850 mV vs. CSE). Corrosion rate was affected mainly not by AC voltage but by both of frequency and AC current density. An experimental corrosion rate relation could be obtained according to effective AC current density, in which AC corrosion rate increased linearly with effective AC current density, and its slope was 0.619 in coupon method and 0.885 in ER probes.

• 한국전자통신학회논문지
• /
• 제10권8호
• /
• pp.921-926
• /
• 2015

멀티 콘센트의 과전류로 인한 과열을 방지하기 위한 보호방식으로는 주로 금속바이메탈 방식, 스위칭회로 방식, 마이크로컨트롤러(MCU)를 이용한 과전류 정밀제어 방식 등이 사용되어 오고 있다. 하지만 이러한 방식들은 보호회로가 과전류가 흐르는 전선에 병렬접속 함으로써 2차 화재의 위험이 있을 수 있으며 입력전압의 비선형 왜곡에 취약한 단점을 가지고 있다. 또한 기존의 방식들은 제품의 단가가 비교적 크게 올라가므로 충분한 시장성을 확보하기가 쉽지 않다. 본 논문에서는 이러한 문제를 해결하고자 과전류가 흐르는 전선에 비접촉식 관통형 변류기를 설계하고 변류기의 2차 유도전류를 이용하여 과전류를 감지하여 사용자가 과전류 상황을 인지할 수 있도록 LED 및 부저 회로를 통하여 시각 및 청각적 신호를 전달하는 기능을 구현한다. 실험 결과들로부터 제안된 회로는 매우 경제적이고 간단하면서도 안정적으로 동작함을 확인 할 수 있다.

• 한국군사과학기술학회지
• /
• 제21권5호
• /
• pp.665-674
• /
• 2018

In this paper, we propose a development results of a D-type non-rechargeable lithium battery($Li/SOCl_2$) on improvement in a low cost protection circuit of discharge for domestic military power source. According to this study, we describe a new design and product with 8-bit microcontroller in the protection circuit which can estimate state of health of the battery regardless of occurring an initial voltage delay. Also this paper discuss and facilitate development as solution to a safety about the non-rechargeable lithium batteries. As a result, we verified a quality of the protection circuit by a development test and evaluation(DT&E) process.

• 한국산학기술학회논문지
• /
• 제18권4호
• /
• pp.504-510
• /
• 2017

본 논문은 소형 가전기기를 위한 AC DC 파워모듈 설계를 제시하고 효율과 신뢰성 및 안정성 특성을 나타낸다. 제안하는 파워모듈은 PCB 테스트보드에서 PWM 제어 IC 칩, 파워모스 소자, 트랜스포머, 각종 수동소자 (저항, 커패시터, 인덕터)를 사용하여 제작하였다. 본 논문에서 제시한 AC DC 파워모듈 회로 시뮬레이션 결과를 토대로 측정한 실험에서 입력전압은 상용전원 전압 220 V (RMS), 주파수 60 HZ의 교류전압(VAC : Voltage alternating current)을 사용 하였으며, 출력전압, OCP (over current protection), EMI(electromagnetic interference), PWM 신호 펄스, 효율 측정, 패키징 여부에 따른 발열측정 등을 실시하였다. 또한 파워모듈의 온도에 따른 특성변화와 트랜스포머 기준으로 1차측의 회로와 2차측 회로의 절연상태 확인을 하기 위한 내전압 테스트 등의 신뢰성테스트를 실시하였다. 효율 및 신뢰성 측정결과, AC DC 파워 모듈이 5 V의 출력전압, 200 mV의 리플, 약 73 %의 효율, 온도 약 $80^{\circ}C$ 까지 안정적으로 동작함을 확인하였으며, 4.2 kV의 크기로 60초 동안 견디는 내압 성능을 보였다.

• Journal of Power Electronics
• /
• 제2권2호
• /
• pp.88-94
• /
• 2002

The demand for protection of power electronic application has during the last couple of vears increased regarding the high-power IGBT modules. Even with an active protection, a high power IGBT still has a risk of exhibiting a violent rupture in the case of a fault if IGBT Fuses do not protect it. By introducing fuses into the circuit this will increase the circuit inductance and slight inductance over-voltage during the turn-off of the diode and the IGBT. It is therefore vital when using fuses that the added inductance is kept at a minimum. This paper discuss three issues regarding the IGBT Fuse protection of adding inductance of existing High-speed and new Typower Fuse protection. First, the problem of adding inductance of exiting High-speed and new Typower Fuse DC-link circuit is treated, second a short discussion of protection of the IGBT module is done, and finally, the impect of the high frwquency loading on the currying capability of the fuses is presented.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
• /
• pp.703-707
• /
• 2001

The demand for protection of power electronic applications has during the last couple of years increased regarding the high-power IGBT modules. Even with an active protection, a high power IGBT still has a risk of exhibiting a violent rupture in the case of a fault if IGBT Fuses do not protect it. By introducing fuses into the circuit this will increase the circuit inductance and slight increase the over-voltage during the turn-off of the diode and the IGBT. It is therefore vital when using fuses that the added inductance is kept at a minimum. This paper discuss three issues regarding the IGBT Fuse protection. First, the problem of adding inductance of existing High-Speed and new Typower fuses in DC-link circuit is treated, second a short discussion of the protection of the IGBT module is done, and finally, the impact of the high frequency loading on the current carrying capability of the fuses is presented.

• 전기학회논문지P
• /
• 제53권3호
• /
• pp.142-147
• /
• 2004

In this study, We developed the microprocessor based controller for Auto Section Switch(ASS). This is installed at consumer's medium-high voltage(load capacity is below 4,000 kVA) switchgear. This function is cooperate with protection device of fault section and automatically dividing the section. And It is designed by Air putter type extinction structure and adopt the mechanism and breaking part module of existing Load Breaker Switch. In addition, We successfully conducted the operation test and checked main function of proto-type.