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마리우스,김민지,오재성,이강우,김은수,황인갑 전력전자학회 2018 전력전자학회 논문지 Vol.23 No.6
This study presents a single-phase single-stage three-level AC/DC converter with a wide controllable output voltage. The proposed AC/DC converter is designed to extend the application of e-mobility, such as electric vehicles. The single-stage converter integrates a PFC converter and a three-level DC/DC converter, operates at a fixed frequency, and provides a wide controllable output voltage (approximately 200–430Vdc) with high efficiencies over a wide load range. In addition, the input boost inductors operate in a discontinuous mode to improve the input power factor. The switching devices operate with ZVS, and the converter’s THD is small, especially at full load. The feasibility of the proposed converter is verified by the experimental results of a 1.5 kW prototype.
입력전압 가변 및 동작 모드 변화를 통해 넓은 출력전압 범위에서 동작하는 LLC 공진컨버터
이지철,주종성,허예창,마리우스,김은수,전용석,국윤상 전력전자학회 2017 전력전자학회 논문지 Vol.22 No.6
In this paper, we propose an LLC resonant converter that operates over a wide controllable output voltage (50 VDC to 800 VDC) and shows high efficiency characteristics under all load conditions and output voltages. Two 3.3kW prototypes are designed for an experimental comparison between the variable frequency control (control scheme 1) and the variable input voltage(VIN) control (control scheme 2) mechanisms. The experimental results show that the variable input control mechanism demonstrates high efficiency under all loads and output voltages.