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노트북 컴퓨터용 LLC 하프 브리지 공진형 어댑터 설계
황국화(Hwang Gookhwa),윤대영(Youn Daeyoung),김창선(Kim Changsun) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The resonant converters cause the high voltage stress according to the input voltage, which increases the conduction loss in converter power switches. The topology of LLC half bridge resonant converter provides ZVS characteristic and also the stress of voltage and current is not higher than that of the general resonant converters. So we can expect the higher efficiency. In this paper, the LLC resonant converter is designed for the notebook computer adapter. In the adapter design, we should consider the weight, the size and overheat of the adapter. Thus the higher efficiency is an essential particular. First of all, the optimal design of transformer is the most important facts. Some parameters should be considered in order to get the highest efficiency. The adapter is designed through the considering of these parameters including the PFC circuit of the pre-regulator. It converts AC line input into about 400V DC Link voltage of the LLC converter input and the converter has 16V<SUB>DC</SUB>/90W ratings. The efficiency measured is about up to 92%.
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김기용(Kim Kiyoung),윤대영(Youn Daeyoung),김창선(Kim Changsun) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The multi-resonant converter minimizes the parasitic oscillations using the resonant tank circuit absorbed parasitic reactances in a converter. So the converter can be operated at a high frequency and it provides a high efficiency because the switching power losses are reduced effectively. However, the high resonant voltage stress of semiconductors leads to the conduction loss. In this paper, it is proposed the novel fly back multi-resonant converter. The converter input is divided by two series input capacitors. And also the resonant stress is reduced to 2-3 times input voltage without any complexity and it provides the various circuit schemes in lots of applications. The proposed converters are verified through simulation and experiment.
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