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전기차용 모듈형 충전기의 효율향상을 위한 모듈 제어기법
민병빈(Byoung-Bin Min),황재창(Jae-Chang Hwang),윤석진(Suk-Jin Yoon),임다니엘지섭(Daniel-Jesuph Lim),정재원(Jai-Won Chung) 대한전기학회 2022 전기학회논문지 P Vol.71 No.2
In this paper, we discuss the module control techniques for improving efficiency of modular charging devices for electric vehicles. A modular charger has modules connected in parallel, and modules connected in parallel uniformly handle a load required for an electric vehicle. power converters typically show low efficeincy in the light loads and high efficiency in the heavy. The amount of power requested by an electric vehicle to a charger varies depending on the internal battery charge amount of the electric vehicle. If the amount of electric power required by an electric vehicle is small, the charger is requested to have low power and the charger operates in a light load section. And the charger operating in the light load section becomes less efficient. A modular charger including a plurality of modules may control the number of modules driven in parallel according to a charging amount required for an electric vehicle, thereby reducing an operation in a light load section and improving the overall efficiency of the charger. In this paper, we have studied how to improve the overall efficiency of the charger through the module control technique of the electric vehicle modular charging unit according to the amount of charging.
김현태(Hyun-Tae Kim),민병빈(Byoung-Bin Min),오준태(Joon-Tae Oh),김규식(Gyu Sik Kim),김희식(Hie Sik Kim),김조천(Jo-Cheon Kim) 대한전기학회 2010 정보 및 제어 심포지엄 논문집 Vol.2010 No.10
In this paper, a particular matter monitoring system for subway stations is proposed. It is generally expensive to get the precise measurement of PM10. However, simple and cheap PM sensors like Airtest can have relatively small errors by using linear regression analysis. We show that Airtest can be useful for measuring PM10 in subway stations.