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Design Consideration of Two Flat Transformers in a Low-Profile LLC Resonant Converter
Sihun Yang,Seiya Abe,Masahito Shoyama 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents the design consideration of a low-profile LLC resonant converter using two flat transformers. The trend toward high power density, high efficiency, and low profile in power supplies has exposed a number of limitations in the use of magnetic component structures. The LLC resonant converter can be operated at a high switching frequency with high efficiency because the switching loss is reduced by soft-switching. However, flat transformer loss causes problems at a high switching frequency. As a result, temperature of flat transformers becomes high. Therefore, it is necessary to reduce the transformer temperature by analyzing the loss. In this proposed converter, flat transformer is integrated into advanced power conversion application systems. Low-profile power module of profile of about 14㎜ is achieved. Temperature inside of transformer repressed to 61℃ and an overall efficiency of about 97.8% was obtained.
On convergence of Laplace inversion for the American put option under the CEV model
Jo, Sihun,Yang, Minsuk,Kim, Geonwoo Elsevier 2016 Journal of computational and applied mathematics Vol.305 No.-
<P><B>Abstract</B></P> <P>In this paper, we study the convergence of the inverse Laplace transform for valuing American put options when the dynamics of the risky asset is governed by the constant elasticity of variance (CEV) model. The CEV model is one popular alternative of the Black–Scholes model to describe well the real financial market. We calculate various coefficients explicitly and prove that the inverse Laplace transform converges absolutely using the properties of Whittaker functions.</P>