HIGH-EFFICIENCY 2-STAGE MULTIPHASE SWITCHED-CAPACITOR CONVERTER VIA VARIABLE-PHASE AND PWM CONTROL

作     者：Chang, Yuen-Haw 

作者机构：Chaoyang Univ Technol Dept Comp Sci & Informat Engn Wufeng Taichung County Taiwan 

出 版 物：《JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS》 (电路、系统与计算机杂志)

年 卷 期：2010年第19卷第8期

页      面：1753-1780页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：National Science Council of Taiwan  R.O.C. [NSC 98-2221-E-324-024/NSC 99-2221/-E-324-014] 

主　　题：Multiphase switched-capacitor (SC) variable-phase control pulse-width-modulation 

摘      要：A closed-loop scheme of 2-stage multiphase switched-capacitor (MPSC) converter is proposed by combining variable-phase control (VPC) and pulse-width-modulation (PWM) technique for low-power DC-DC step-up conversion and high-efficiency output regulation. In this MPSC, there are 2 voltage doublers in series for boosting voltage gain up to 4 at most. Here, VPC is suggested to improve power efficiency, especially for the lower output voltage. It realizes a variable multiphase operation by changing MPSC topological path for more suitable level of voltage gain (4x/3x/2x/1x) according to the desired output. Besides, PWM is adopted for better output regulation not only to compensate dynamic error, but also to reinforce robustness against source/loading variation. Further, the theoretical analysis and design include: MPSC model, steady-state analysis, power efficiency, conversion ratio, ripple percentage, capacitance selection, stability, and control design. Finally, the closed-loop MPSC is simulated, and the hardware implementation is realized and tested. All the results are illustrated to show the efficacy of the proposed scheme.