Browsing by Author "Lin, Yi-Cherng"

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A method using an averaging technique for the analysis and evaluation of real quasi-resonant converters
(2006-06-01)
Lin, Yi-Cherng
;
Liaw, Der-Cherng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A method using an averaging technique for the analysis and evaluation of real quasi-resonant converters (QRC's) is proposed in this paper. To reduce the great difference between the real characteristics and those of ideal circuits, a modeling technique is developed by considering the effect of parasitic power losses. Then, using the averaging approach reasonably simplifies the process of solving equations to obtain the steady-state solutions of state variables. Also, an updating algorithm is constructed to take all the power losses such as core losses, which are often absent in the conventional analysis, into account to improve the accuracy of the steady-state solutions. By these efforts, the evaluation of characteristics for QRC's is realized.
A novel approach for characteristic evaluation of practical buck zero-voltage switching quasi-resonant converters
(2005)
Lin, Yi-Cherng
;
Liaw, Der-Cherng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
In this paper, we propose a modeling bases scheme to study the practical characteristics of Buck zero-voltage switching quasi-resonant converters (Buck ZVS-QRC's). Instead of assuming the unity power efficiency and/or having the ideal characteristics of all circuit components in most existing studies, a feasible model taking the equivalent intrinsic resistance of each circuit component and the voltages of inductors into account is used to describe the steady-state operation of the converter. By using the developed technique, the circuit equations can be simplified to obtain symbolic solutions. Then, an iterative algorithm is constructed for solving operating points. With the aid of the derived expressions, functions of operating point, a parametric analysis of practical behavioral characteristics is also realized. Experimental results demonstrate the effectiveness of the proposed method.