Design and Implementation of High-Gain Serial-Parallel Switched-Capacitor Step-Up DC-DC Converter

• Main Authors: Song-Ying Kuo, 郭松穎
• Other Authors: Yuen-Haw Chang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/36194865026965542564

碩士 === 朝陽科技大學 === 資訊工程系碩士班 === 100 === A closed-loop scheme of high-gain serial-parallel switched-capacitor step-up DC-DC converter (SPSCC) is proposed by combining a phase generator and pulse-width-modulation (PWM) controller for step-up DC-DC conversion/regulation. The SC-based converter needs no magnetic element, e.g. inductor and transformer. In this SPSCC, there are two 3-stage SC cells in cascade between source VS and output VO, where each cell has 3 pumping capacitors. By using these capacitors charging in parallel and discharging in series, plus the front-stage voltage connected in series, each SC cell can be treated as a small step-up converter with a 4× voltage gain. Thus, this SPSCC is able to boost VO to 4×4 times voltage of VS at most just with the fewer number of pumping capacitors (6 totally). Further, the PWM technique is adopted not only to enhance the output regulation for the compensation of the dynamic error between the practical and desired outputs, but also to reinforce output robustness against source or loading variation. Finally, the closed-loop SPSCC is designed by OrCAD Pspice, and simulated for some cases as: (1) steady-state response, (2) dynamic response (source/loading variation).