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Multistage multiphase switched‐capacitor DC–DC converter with variable‐phase and PWM control
Author(s) -
Chang YuenHaw,
Chen YiChing
Publication year - 2012
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.758
Subject(s) - control theory (sociology) , pulse width modulation , ripple , switched capacitor , robustness (evolution) , capacitor , voltage , computer science , mathematics , engineering , electrical engineering , control (management) , biochemistry , chemistry , artificial intelligence , gene
SUMMARY A closed‐loop multistage multiphase switched‐capacitor converter ( n ‐stage p ‐phase MPSC) is proposed with a variable‐phase control (VPC) and a pulse‐width‐modulation (PWM) technique for low‐power step‐up conversion and high‐efficiency regulation. In this n ‐stage MPSC, n voltage doublers are connected in series for boosting the voltage gain up to 2 n at most. Here, VPC is suggested to realize a variable multiphase operation by changing the phase number p and topological path for the more suitable level of voltage gain so as to improve the power efficiency, especially for the lower output voltage Besides, PWM is adopted not only to enhance output regulation for different desired outputs, but also to reinforce output robustness to source/loading variation. Further, some theoretical analyses and designs include: n ‐stage p ‐phase MPSC model, steady‐state analysis, conversion ratio, power efficiency, output ripple, stability, capacitance selection, and control design. Finally, the closed‐loop MPSC is simulated, and the hardware is implemented and tested. All the results are illustrated to show the efficacy of the proposed scheme. Copyright © 2011 John Wiley & Sons, Ltd.