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부트스트랩 회로와 차지 펌프 회로를 이용한 플로팅 스위치의 음 전원 공급 방법에 대한 연구
배정환(Joung-Hwan Bae),이종무(Jong-Mu Lee),원충연(Chung-Yuen Won) 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.7
The unipolar gate driving method provides a low cost and simple solution for inverter system design. However, the unipolar gate driving can cause issues like ‘parasitic oscillation’ during turn-on of power switches and ‘unintended parasitic turn-on’ caused by the Miller-effect of power semiconductors. Hence the maximum value of gate resistance has to be limited. The proposed bootstrap circuit can generate a negative gate voltage with minimal increase of components. For this purpose a charge-pump circuitry is merged with a standard bootstrap topology which can generate a negative as well as a positive gate voltage for floating switches without additional isolated power supply.
서버용 650Watt 고효율 파워 서플라이 설계 방안 연구
배정환(Joung-Hwan Bae),이종무(Jong-Mu Lee),원충연(Chung-Yuen Won) 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.6
This paper proposed highly efficiency PSU(Power Supply Unit) using dual boost PFC circuit, LLC resonant converter, and Buck converter. In order to minimize the power conversion loss, PFC circuit selects Bridgeless PFC Dual Boost type using two switching elements and two SiC diodes and minimizes loss by using synchronous rectifier switching method. Using these power topologies helped PSU to meet up to 92% power efficiency and it made a low current and voltage ripple. Furthermore, the proposed method could stably supply the 3.3V and 5V from 12V for network system. In this paper the converter design and loss reduction method were proposed and the whole circuit had designed into 650W rated power. The theories and power efficiency of PSU were confirmed by simulation and experiment.
윤환균(Yun Hwan-Kyun),김이훈(Kim Lee-Hun),김준호(Kim Jun-Ho),원충연(Won Chung-Yuen),최기수(Choi Ki-Soo),배정환(Bae Joung-Hwan) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
Much attention has given to EMI effects created by variable speed ac drive system. This paper focuses on the switching technique to mitigate common mode voltage.<br/> Zero switching states of inverter control invoke large common mode voltage. Using inversed carrier wave, zero switching states are removed. In addition, proposed technique is easy to apply to existing 2-level inverter design.<br/> Simulation results show that common mode voltages adapting proposed technique are reduced regarding conventional method.
직렬형 PWM 인버터를 이용한 동적전압보상기에 관한 연구
배정환,한병문,한경희,김희중 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-
This paper presents a novel compensation method for the voltage sag problem for a critical load. This method is able to restore the supply voltage to the original magnitude and shape by injecting the vector diffence between the desired voltage and the actual voltage. The proposed system consists of a dc energy storage device, dc-ac converter, and a coupling transformer to inject the output of the inverter in series with the line. It can make up for the weakness of UPS and SPS. The operation of this system is verified by the computer simulation with EMTP code and experimental work with a scaled model. The advantages of this new system over the existing system are the fast reaction time and the low compensation energy in operation.