• Title/Summary/Keyword: Switch Point

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

  • 이민석;송광석;박동선
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.6
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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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To Ensure A Product Reliability The Study on Accelerated Stress Tests for Magnetic Switch Used in Power Distribution System (제품 신뢰성 확보을 위한 배전 계통에 사용되는 전자개폐기 가속스트레스시험에 관한 연구)

  • Ryu, Haeng-Soo;Park, Sang-Yong;Han, Gyu-Hwan;Kwon, Young-Il;Yoon, Nam-Sik
    • Proceedings of the KIEE Conference
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    • 2005.07a
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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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Interconnection Network for Routing Distributed Video Stream on Popularity - Independent Multimedia-on-Demand Server (PIMODS서버에서 분산 비디오스트림의 전송을 위한 상호연결망)

  • 임강빈;류문간;신준호;김상중;최경희;정기현
    • Journal of the Korean Institute of Telematics and Electronics C
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    • v.36C no.11
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    • pp.35-45
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    • 1999
  • This paper presents an interconnection network for load balancing on a multimedia server and proposes a simple probabilistic model of the interconnection network for analysing the traffic characteristics. Because the switch uses deflection algorithm for routing, the traffic load on the switch seriously affects deflection probability. In this paper, we trace the deflection probability as a function of the traffic load according to the model. By comparing the result with the empirical result, we prove that the model is useful for estimating the deflection probability and traffic saturation point against the amount of packets getting into the switch.

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

  • Jo, Si-Hwan;Kwak, Dong-Kurl;Jung, Do-Young;Shim, Jae-Sun;Kim, Jung-Sook
    • Proceedings of the KIEE Conference
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    • 2008.07a
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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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The Power Supply for High Frequency Induction Heating by using the Current Resonance (전류공진을 이용한 고주파 유도가열용 전원장치)

  • Ra, B.H.;Lee, E.Y.;Song, D.H.;Suh, K.Y.;Lee, H.W.
    • Proceedings of the KIEE Conference
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    • 2002.11d
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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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Three Phase Three-Level Switched Voltage Source PWM Inverter with Zero Neutral Point Potential (영 전위 중성점을 가진 새로운 3상 Three-Level 스위치 전압원 인버터)

  • Oh Won-Sik;Han Sang-Kyoo;Choi Seong-Wook;Moon Gun-Woo
    • Proceedings of the KIPE Conference
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    • 2004.07b
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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
    • Proceedings of the KIPE Conference
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    • 2011.11a
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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 Switch Modelling of Boost Converter for Photovoltaic System (PWM 스윗치를 이용한 햇빛발전 시스템용 부스트 컨버터 모델링)

  • Kim, H.J.;Choi, J.Y.;Yu, G.J.;Jung, Y.S.;Choi, I.;Ahan, H.S.
    • Proceedings of the KIEE Conference
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    • 2003.04a
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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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Simulation and Analysis of Losses of Switching Device for Single Grid-connected Full bridge inverter (단상 계통 연계형 풀브릿지 인버터의 스위치 손실 모의 및 분석)

  • Son, Myeongsu;Lim, Hyun Ji;Cho, Younghoon
    • Proceedings of the KIPE Conference
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    • 2017.11a
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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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A New Switching Method for Reducing switch loss of Single-phase three-level NPC inverter (스위치 손실 감소를 위한 단상 3레벨 NPC 인버터의 새로운 스위칭 방법)

  • Lee, Seung-Joo;Lee, June-Seok;Lee, Kyo-Beum
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.2
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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.