Study of High-Frequency Ripple Effect on Feedback Modulator Gain of Power Converters

• Main Authors: Shiang-Wei Chuang, 莊湘微
• Other Authors: Dan Chen
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/35214591604109605271

碩士 === 國立臺灣大學 === 電機工程學研究所 === 95 === Control loop gain is a very important consideration in the design of a power converter feedback circuit. It affects not only the circuit feedback stability but also the control performances. One of the factors of the converter control loop gain is the pulse-width modulator gain. In the past, this factor has been derived from an assumption that the switching frequency ripple is negligible. Reasonable accuracy has been obtained under this assumption. In this thesis, the ripple effect on the modulator gain was studied using analytical derivation and computer simulations. A new equation of the modulator gain was obtained. Simulation results using SIMPLIS package were used to cross check the theoretical derivation. Discrepancies from the two results were investigated and conclusions drawn.