Implementation and Study of LLC Resonant Converter
| Autor: | Chih-Hao Chan, 詹智皓 |
|---|---|
| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 This thesis conducts Genetic Algorithm and Taguchi method to determine the component values of the resonant circuit. Since LLC resonant converter possesses soft-switching characteristic and has high transfer efficiency and low electromagnetic interference, it is suitable to be used in switching power supplies. Nevertheless, the high output current ripple requiring a larger capacitor is a major drawback that limits the applications of LLC resonant converter. Even though current-shaping technologies have been proposed for overcoming the above-mentioned defect, but there is still no systematic method for the determination of the resonant circuit parameters effectively. Therefore this study develops a novel method to implement a productive resonant circuit for depressing the output current ripple and the experimental results show that there is 20.4% reduction in full-load operation. This thesis first analyzes the operation principles of the LLC resonant converter and the same converter with current-shaping technogy. Afterward MathCAD and Genetic Algorithm are adopted to analyze and determine the resonant circuit parameters for the lowest output current ripple. Also IsSpice software is used for circuit simulations. Besides, the theoretical values obtained from theoretical analysis are confined to the standard specifications of elements, so that proper element specifications cannot be established and the functioning of prototype circuit is far from ideal. Therefore Taguchi method is conducted to achieve optimal design. Eventually, an LLC resonant converter with current shaping is implemented and thus proves the feasibility of the proposed method. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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