Stability Analysis of Li-ion Battery Charger with Multi-Feedback Loops
| Autor: | Wei-Jung Hsu, 許維容 |
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| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 Lithium batteries have recently become popular energy-storage devices for many portable products. There are a variety of control schemes for the charging of such a battery. In this thesis, a specific charging configuration composed of a buck converter with a peak current-loop control and multiple outer feedback-loops control is the focus. In addition, only one feedback compensator network can be used. In the thesis, a detailed analysis of the circuit operating modes throughout a complete charging cycle is given. This analysis leads to eight different feedback paths, depending on the stage/condition of the charging process. Small-signal models are developed for each of the eight configurations. Since only one compensator circuit is used for stabilizing the eight different configurations, a worst case analysis of the uncompensated loop gain transfer functions is necessary. Based on the analysis, a design procedure for the compensation network is developed. Simulations are conducted to verify the small-signal model and the compensator design procedure developed. The results reported in the thesis are primarily part of the evaluation efforts preceding an IC development for such the specific charger. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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