• ETRI Journal
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• 제31권6호
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• pp.770-777
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• 2009

We have developed a fully functional reconfigurable optical add-drop multiplexer (ROADM) switch module using a polymer integrated photonic lightwave circuit technology. The polymer variable optical attenuator (VOA) array and digital optical switch array are integrated into one polymer PLC chip and packaged to form a 10-channel VOA integrated optical switch module. Four of these optical switch modules are used in the ROADM switch module to execute 40-channel switching and power equalization. As a wavelength division multiplexer (WDM) filter device, two C-band 40-channel athermal arrayed waveguide grating WDMs are used in the ROADM module. Optical power monitoring of each channel is carried out using a 5% tap PD. A controller and firmware having the functions of a 40-channel switch and VOA control, optical power monitoring, as well as TEC temperature control, and data communication interfaces are also developed in this study.

• Journal of international Conference on Electrical Machines and Systems
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• 제3권4호
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• pp.465-471
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• 2014

This paper proposes a new switching algorithm for an active clamp snubber to improve the efficiency of a module integrated converter system. This system uses an active clamp method for the snubber circuit for the efficiency and reliability of the system. However, the active clamp snubber circuit has the disadvantage that system efficiency is decreased by switch operating time because of heat loss in resonance between the snubber capacitor and leakage inductance. To address this, this paper proposes a new switching algorithm. The proposed algorithm is a technique to reduce power consumption by reducing the resonance of the snubber switch operation time. Also, the snubber switch is operated at zero voltage switching by turning on the snubber switch before main switch turn-off. Simulation and experimental results are presented to show the validity of the proposed new active clamp control algorithm.

• 한국컴퓨터정보학회논문지
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• 제18권9호
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• pp.33-41
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• 2013

본 논문에서는 CdS(황화 카드뮴) 광센서란 소자를 태양광 모듈로 대체하여, 신재생에너지를 통한 충전도 하며 이 전력으로 동작하는 태양광 스위치를 제안하고 이의 효용성을 실험/검증하고자 한다. 우선 기존의 CdS 광센서와 이를 포함한 자동 점멸 스위치의 동작 원리를 조사해 본 후, 태양광 모듈의 특성을 조사함으로써 기존의 광센서를 태양광 모듈로 대체가능할 지를 분석해 본다. 그 가능성을 확인해 본 후, 태양광 스위치 회로를 설계 및 구현한 후, 이의 특성을 실험해 봄으로써 기존 스위치를 대체 가능함을 보이고 그 특성들을 비교/평가해 본다. 연구 결과 제안하는 태양광 스위치가 기존의 자동 점멸 스위치를 대체 가능함을 확인하였을 뿐만 아니라, 보다 많은 장점들을 가지고 있음을 확인하였다.

• 한국시뮬레이션학회논문지
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• 제8권4호
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• pp.1-8
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• 1999

This paper proposes an ATM switch architecture called Output Queued Batcher-Banyan switch (OQBBS). It consists of a Sorting Module, Expanding Module, and Output Queueing Modules. The principles of channel grouping and output queueing are used to increase the maximum throughput of an ATM switch. One distinctive feature of the OQBBS is that multiple cells can be simultaneously delivered to their desired output. The switch architecture is shown to be modular and easily expandable. The performance of the OQBBS in terms of throughput, cell delays, and cell loss rate under uniform random traffic condition is evaluated by computer simulation. The throughput and the average cell delay are close to the ideal performance behavior of a fully connected output queued crossbar switch. It is also shown that the OQBBS meets the cell loss probability requirement of $10^{-6}$.

• 인터넷정보학회논문지
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• 제5권3호
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• pp.45-56
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• 2004

본 논문에서는 네트워크가 많은 endpoint를 가질지라도 낮은 비트율의 데이터를 효율적으로 전송할 수 있는 AAL 유형 2 스위치를 포함하는 ATM스위치 구조를 제안한다. 컴퓨터 프로그램으로 모델링한 ATM스위치는 AAL 유형 1, AAL 유형 2, AAL 유형 3/4 및 AAL 유형 5 셀로 이루어진 모든 유형의 AAL 셀에 대해 셀 스위칭을 지원하고 있다. 우리는 2가지 방식의 스위치를 제안하고 있는데, 하나는 개별적인 입력 포트마다 AAL 유형 2 셀 처리를 지원하는 스위치 패브릭이고, 다른 하나는 모든 입력 포트에 대한 전체적인 AAL 셀 처리를 지원하는 스위치 패브릭이다. 시뮬레이션 결과는 후자의 방식이 전자의 방식보다 우수한 것으로 나타났다. 그러나, 전자의 방식이 구현이 용이하고, 확장성에 대한 장점을 가지고 있다. 따라서 본 논문에서는 전자의 방식을 채용한 AAL 유형 2 스위치 모듈을 VHDL 언어를 사용하여 설계하였으며, 이를 FPGA로 구현하였다. 설계된 칩은 52MHz에서 동작하였다. 본 논문의 ATM 스위치 패브릭은 범용의 ATM 스위치 패브릭으로서 뿐만 아니라 ATM 네트워크상으로 모바일 통신, 협대역 서비스 및 무선 ATM등에 폭넓게 응용될 것으로 사료된다.

• 전력전자학회논문지
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• 제28권1호
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• pp.39-47
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• 2023

This paper applies a structural technique with uniform parallel switch characteristics in gates and power loops to minimize the ringing and current imbalance that occurs when a general discrete package (TO-247)-based power semiconductor device is operated in parallel. Also, this propose a heat sink integrated switching module with heat sink design flexibility and high power density. The developed heat dissipation-integrated switching module verifies the symmetry of the parasitic inductance of the parallel switch through Q3D by ansys and the validity of the structural technique of the parallel switch using the LLC resonant converter experiment operating at a rated capacity of 7.5 kW.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2016년도 전력전자학술대회 논문집
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• pp.361-362
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• 2016

Presented in this paper is the design of a high voltage switch module made up of MOSFETs, pulse transformers and their gate driver circuits compactly fitted onto a single PCB module. The ease by which the switch modules can be configured (series stacking and/or parallel stacking) to meet future load variations allows for flexible operation of this design. In addition, the detailed implementation of the gate driver circuit for reliable and easier switch synchronization is also described in this paper. The stored energy in the capacitor bank of a 15kV, 4.5kJ/s peak power capacitor charger was discharged using the developed high voltage switch, and by experimental results, the operation of the proposed circuit was verified to be effectively used as a switch for pulse discharging.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 G
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• pp.2464-2466
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• 1998

A switch is a component with two or more ports that selectively transmits, redirects, or blocks optical power in a fiber transmission line. Our switch uses rotation mechanism using stepping motor, hence the common optical fiber can scan and allign to one of the arrayed N optical fibers to provide optical path by electronic precise control. The developed switch is consisted of switching module and its control module. The performance parameters of a switching loss and a repeatability are considered very important. We performed the study to reduce the switching loss and improve the repeatability of switch. The switch can be widely used as a test instrument of optical device and of optical cable in factory, also of optical cable monitoring systems.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.267-270
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• 2000

In this paper, we consider the simple redundant structures with the function of hardware based active/standby control. The system includes two switch modules. The switch module is connected to a data bus, but only the active switch module has control of the data bus. The standby unit takes over the function of the active unit when the active unit failure or mode command are asserted. And this paper illustrate the high-speed router system and the overall redundant system architecture. The proposed redundant architecture for 80G Router system is verified and implemented with experiment.

• ETRI Journal
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• 제33권1호
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• pp.136-139
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• 2011

A modular upgrade design for packet transport switch nodes is presented where packet loss is dramatically reduced by intra-module and inter-module buffer sharing. This modular design offers significant cost and power reduction in a high-data-rate system where buffers are highly costly and power-greedy.