• 제목/요약/키워드: Switch Point

검색결과 242건 처리시간 0.032초

ATM교환기의 프로세서간 통신을 위한 바이패싱 기능을 갖는 고속 셀 집속/분배 장치의 설계 및 성능평가 (The design and performance evaluation of a high-speed cell concentrator/distributor with a bypassing capability for interprocessor communication in ATM switching systems)

  • 이민석;송광석;박동선
    • 한국통신학회논문지
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    • 제22권6호
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    • pp.1323-1333
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    • 1997
  • In this paper, we propose an efficient architecture for a high-speed cell concentrator/distributor(HCCD) in an ATM(Asynchronous Transfer Mode) switch and by analyzeing the simulation results evaluate the performance of the proposed architecuture. The proposed HCCD distributes cells from a switch link to local processors, or concentrates cells from local processor s to a switch link. This design is to guarntee a high throughput for the IPC (inter-processor communication) link in a distributed ATM switching system. The HCCD is designed in a moudlar architecture to provide the extensibility and the flexibility. The main characteristics of the HCCD are 1) Adaption of a local CPU in HCCD for improving flexibility of the system, 2) A cell-baced statistical multiplexing function for efficient multiplexing, 3) A cell distribution function based on VPI(Virtual Path Identifier), 4) A bypassing capability for IPC between processor attached to the same HCCD, 5) A multicasting capability for point-to-multipoint communication, 6) A VPI table updating function for the efficient management of links, 7) A self-testing function for detecting system fault.

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제품 신뢰성 확보을 위한 배전 계통에 사용되는 전자개폐기 가속스트레스시험에 관한 연구 (To Ensure A Product Reliability The Study on Accelerated Stress Tests for Magnetic Switch Used in Power Distribution System)

  • 류행수;박상용;한규환;권영일;윤남식
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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    • pp.377-380
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    • 2005
  • In this paper, accelerated stress test(AST) for Magnetic Switch (MS) are applied to assure specified reliability of the products. Magnetic contactor that functions with over-current relay is called MS. Magnetic contactor closes and opens the motor load with ON/OFF switch of electronic contactor. It is also used for protecting and controlling the load. Magnetic contactor detects the over-current flow in the load with a over-current relay and disconnects the load by opening its control power. In this study, AST for product assembly are developed in order to improve the weak point so that increase the product reliability. Also we will show the basic information for the accelerated life test(ALT). The proposed AST results and procedures may be extended and applied to testing similar kinds of products to reduce test times and costs of the tests remarkably. Finally the results of this study will contribute to improving reliability of products and strengthening competitiveness of our products in the world markets.

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PIMODS서버에서 분산 비디오스트림의 전송을 위한 상호연결망 (Interconnection Network for Routing Distributed Video Stream on Popularity - Independent Multimedia-on-Demand Server)

  • 임강빈;류문간;신준호;김상중;최경희;정기현
    • 전자공학회논문지C
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    • 제36C권11호
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    • pp.35-45
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    • 1999
  • 본 논문은 멀티미디어 서버의 부하 편중현상을 해결하기 위한 스위치를 제시하고 그 스위치에서의 트래픽 특성 분석을 위한 간단한 확률적 모델을 제안한다. 스위치는 경로설정 방안으로 우회방안을 이용하므로 스위치 내의 트래픽 부하는 우회확률에 커다란 영향을 미친다 본 논문에서는 제안한 모델에 의거하여 스위치의 트래픽 부하에 따르는 우회확률을 추적하였다. 그리고 그 결과를 실험적 결과와 비교함으로써 확률적 모델의 타당성을 검증하였다. 확률적 모델에 의하여 스위치 안으로 유입되는 패킷의 양에 따라 발생하는 우회와 그에 따르는 스위치의 트래픽 포화지점을 예측할 수 있다.

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과전류 및 단락사고 방지용 전기안전 제어장치에 관한 연구 (A Study on Electric Safety Control Device for Prevention of Over Current and Short Circuit Faults)

  • 조시환;곽동걸;정도영;심재선;김정숙
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2008년도 제39회 하계학술대회
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    • pp.2100-2101
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    • 2008
  • This paper is studied on a protective control system for electrical fire and electrical faults due to over current or electric short circuit faults by using electrical thermal characteristics of PTC (Positive Temperature Coefficient) thermistor and current response characteristics of high sensitive reed switch. The PTC thermistor has characteristic of positive resistivity temperature coefficient according to the temperature variation, which is construction of a regular square and cube demarcation with BaTiO3_Ceramics of positive temperature coefficient. Also PTC thermistor shows the phenomenon which is rapidly increased in the resistivity if the temperature is increased over Curie temperature point, and reed switch, which is used for electrical fault current sensing devices, have a excellent characteristic of response velocity in degree of ${\mu}s{\sim}ms$ that sensing magnetic flux in proportion to dimension of line current. This paper is proposed on a protective control system use PTC thermistor and reed switch for sensor which is protected from electrical fire due to overload faults or electric short circuit faults. Some experimental results of the proposed electric safety control device are confirmed to the validity of the analytical results.

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전류공진을 이용한 고주파 유도가열용 전원장치 (The Power Supply for High Frequency Induction Heating by using the Current Resonance)

  • 라병훈;이은영;송대현;서기영;이현우
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.263-266
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    • 2002
  • In this paper, It is indicating that an issues of the conventional boost converter for high frequency induction heating. To improve those issues, it is proposed, simulated and analyzed that the current resonant circuit, simulated. As the result, we knew that the proposed circuit has a good point to improve the waveform of input current and to make high efficiency. On the other side, in the inverter for the high current power supply, it is proposed that the high frequency inverter of the half bridge topology, be done the circuit analysis to extract the optimal circuit parameter. It is making sure of the soft switching operating by the inductor to reverse parallel connected on the inverter main switch, decreasing the surge voltage when the switch is turn-off by compulsion, and repressing the switch current and bringing the high current amplitude operation by the multi resonance.

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영 전위 중성점을 가진 새로운 3상 Three-Level 스위치 전압원 인버터 (Three Phase Three-Level Switched Voltage Source PWM Inverter with Zero Neutral Point Potential)

  • 오원식;한상규;최성욱;문건우
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2004년도 전력전자학술대회 논문집(2)
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    • pp.630-634
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    • 2004
  • A new three phase three-level Pulse Width Modulation (PWM) Switched Voltage Source (SVS) inverter with zero neutral point potential is proposed. The major advantage is that the peak value of the phase output voltage is twice as high as that of the conventional neutral-point-clamped (NPC) PWM inverter. Furthermore, three-level waveforms of the proposed inverter can be achieved without switch voltage unbalance problem. Since the average neutral point potential of the proposed inverter is zero, the common ground between input stage and output stage is possible. The proposed inverter is verified by experimental results based on a laboratory prototype.

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Photovoltaic Micro Converter Operated in Boundary Conduction Mode Interfaced with DC Distribution System

  • Seo, Gab-Su;Shin, Jong-Won;Cho, Bo-Hyung;Lee, Kyu-Chan
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2011년도 추계학술대회
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    • pp.44-45
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    • 2011
  • Research on photovoltaic (PV) generation is taking a lot of attention due to its infinity and environment-friendliness with decrease of price per PV cell. While central inverters connect group of PV modules to utility grid in which maximum power point tracking (MPPT) for each module is difficult, micro inverter is attached on each module so that MPPT for individual modules can be easily achieved. Moreover, energy generation and consumption efficiency can be much improved by employing direct current (DC) distribution system. In this paper, a digitally controlled PV micro converter interfacing PV to DC distribution system is proposed. Boundary conduction mode (BCM) is utilized to achieve zero voltage switching (ZVS) of active switch and eliminate reverse recovery problem of passive switch. A 120W prototype boost PV micro converter is implemented to verify the feasibility and experimental results show higher than 98% efficiency at peak power and 97.29% of European efficiency.

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PWM 스윗치를 이용한 햇빛발전 시스템용 부스트 컨버터 모델링 (PWM Switch Modelling of Boost Converter for Photovoltaic System)

  • 김효진;최주엽;유권종;정영석;최익;안현식
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.341-348
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    • 2003
  • Photovoltaic systems normally use a maximum power point tracking (MPPT) technique ta continuously deliver the highest possible power to the load when variations in the insolation and temperature occur. A simple method of tracking the maximum power points (MPPs) and forcing the boost converter system to operate close to these points is presented through deriving small-signal model and transfer function of boost converter. This paper aims at modeling boost converter including equivalent series resistance of input reservoir capacitor by state-space-averaging method and PWM switch model with properly designed controller for maximum photovoltaic power tracking control.

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단상 계통 연계형 풀브릿지 인버터의 스위치 손실 모의 및 분석 (Simulation and Analysis of Losses of Switching Device for Single Grid-connected Full bridge inverter)

  • 손명수;임현지;조영훈
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2017년도 추계학술대회
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    • pp.101-102
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    • 2017
  • This paper presents analysis of losses of switching device for full bridge inverter connected to grid. The losses are a dominant factor that judges efficiency of the system. The losses of switching device are divided to switching loss and conduction loss. They are can be estimated by analyzing periodic switching waveforms. The switching loss is generated at the point that turn-on and off. And the conduction loss is generated while the switch is on condition. The estimated losses of switch are compared to simulation result in this paper.

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스위치 손실 감소를 위한 단상 3레벨 NPC 인버터의 새로운 스위칭 방법 (A New Switching Method for Reducing switch loss of Single-phase three-level NPC inverter)

  • 이승주;이준석;이교범
    • 전기학회논문지
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    • 제64권2호
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    • pp.268-275
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    • 2015
  • This paper proposes a method of switching to improve power loss for the single-phase three-level NPC inverter. The conventional switching methods, which are called as the bipolar and unipolar switching methods, are used for single phase inverters using three-level topology. However, these switching method have disadvantage in the power loss. Because all of the switch are operated. To reduce the power loss of the three-level NPC inverter, clamp switching method is introduced in this paper. This way, one of the lag is fixed that switching loss is reduced. This paper analyzes and compares power losses of unipolar method and clamp method. The validity of the power loss analysis is verified through the simulation and experimental results.