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- 저자 : 嚴泰昱(Tae-Wook Um) (검색결과 3 건)
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보조스위치를 이용한 매트릭스 컨버터(Matrix Converter)의 소프트스위칭 기법
엄태욱(Tae Wook Um),김윤호(Yoon Ho Kim),김승모(Seung Mo Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper presents a soft-switching technique of single-stage power conversion Matrix Converter of AC-AC converters Conventional hard-switching method is limited to operate at low switching frequency due to increased switching loss. In this paper, by additional auxiliary switch circuits, it is shown that the main switch of the matrix converter operate as a zero-voltage switches, and the auxiliary switch operate as a zero current switch. Finally, the soft-switching technique with auxiliary switches is compared with conventional hard-switching technique, and is analyzed by simulation.
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가변주파수 스위칭 Flyback 컨버터를 이용한 자동차용 고압방전등 안정기의 설계
엄태욱(Tae-Wook Um),김윤호(Yoon-Ho Kim) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.4
본 논문은 가변주파수 스위칭 방식의 flyback 컨버터를 이용한 자동차용 35[W]급 고휘도 방전 램프용 전자식 안정기의 고효율 제어시스템을 구현하였다. 또한 안정기 성능, 크기 그리고 효율을 고려하여 planar 변압기를 이용하여 flyback 컨버터를 설계하였다. HID 램프를 자동차에 적용하기 위해 복잡한 과도특성을 제어할 수 있는 매우 복잡한 제어회로와 고효율의 안정기의 제작이 요구되어진다. 제안된 전자식 안정기는 planar 변압기를 사용한 flyback 컨버터, full bridge 인버터와 숭압 정화장치로 구성되어 있으며, flyback 컨버터의 스위칭 주파수는 안정기에 입력 전압의 변화에 따라 제어되도록 설계하였고, planar 변압기를 사용하여, 안정기의 가격과 크기를 크게 절감할 수 있었다. 제안된 시스템에 대한 성능 및 효율은 여러 가지 실험을 통해 확인하였다. This paper presents high efficiency control system of automotive 35W electronic ballast for high intensity discharge(HID) lamp using switching flyback converter with variable frequency, Considering performance, size and efficiency of ballast, the flyback converter is designed with planar transformer in converter stage. HID lamp demands a highly efficient ballast and very complex control circuitry that can control complex transient state for applying to automotive. The proposed electronic ballast system is composed of a flyback converter using planar transformer, a full bridge inverter, and a step up ignitor. In this system, switching frequency of flyback converter is controlled by varying input voltage of HID ballast and the price and the size of HID ballast using planar transformer can be reduced. The performance and efficiency of the proposed system are verified through various the experiment results.
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자동차 헤드라이트용 고압방전등 안정기 시스템의 새로운 점등방식
李在鶴(Jae-Hak Lee),金倫鎬(Yoon-Ho Kim),嚴泰昱(Tae-Wook Um) 대한전기학회 2006 전기학회논문지 B Vol.55 No.4
This paper presents novel ignition method for automotive 35W metal halide discharge lamp electronic ballast. At this study, the novel method of ignition is developed to reduce costs and size of the ballast. By use of the novel method, the voltage needed in ignition is decreased, which result in use of the lower voltage rating power devices compared with conventional method and product compactness was achieved by deleting a circuit generating negative voltage needed in ignition at an conventional circuit. In terms of luminosity, color rendering, light efficiency(㏐/W) and lifespan, the metal halide lamp is superior to, but unlike halogen lamp, it have more complicated transient characteristics to reach its steady state than the conventional halogen lamp. Therefore, in this paper, the electronic ballast was designed such that the metal halide lamp could be optimized for the automotive, by applying a method of microcontroller-based digital control. The results of the proposed system is verified through various experiment results.
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