Analysis and Measurement of Small Signal Stability for a Commercial PFC Circuit

• Main Authors: Wei-Lun Huang, 黃瑋倫
• Other Authors: Chih-Wen Liu
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/68412289360386947346

碩士 === 國立臺灣大學 === 電機工程學研究所 === 95 === The theme of this thesis is focused on the measurement and analysis in the small signal model of a power factor correction circuit (PFC). By the design of a system feedback compensator, the analysis of system stability is achieved. In this thesis, several PFC models and control methods are introduced, and the operating theory of PFC is illustrated in detail. In further, the small signal models in average current mode of both current and voltage loops are derived so that the transfer functions can be applied to the design of the system feedback compensator. In order to validate the feasibility, the MATHCAD and MATLAB programs are applied to test the accuracy. By utilizing TI commercial PFC control IC “UCC3817”, the control loop compensator is implemented and completed. The measurement results of frequency response analyzer are in accord with the mathematical computation. In the end, the practical techniques and approaches to measure both current and voltage loops, which can be an important reference for the industry, are advanced and come to a conclusion.