Premium
A switch‐utilization‐improved switched‐inductor switched‐capacitor converter with adapting stage number
Author(s) -
Chang YuenHaw,
Chen YuJhang
Publication year - 2016
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.2102
Subject(s) - switched capacitor , inductor , capacitor , duty cycle , ripple , pulse width modulation , inductance , control theory (sociology) , capacitance , voltage , electronic engineering , engineering , computer science , electrical engineering , physics , control (management) , electrode , artificial intelligence , quantum mechanics
SUMMARY A novel closed‐loop switched‐inductor switched‐capacitor converter (SISCC) is proposed by using the pulse‐width‐modulation (PWM) compensation for the step‐up DC–DC conversion/regulation, and together by combining the adaptive‐stage‐number (ASN), control for the higher switch utilization and wider supply voltage range. The power part of SISCC is composed of two cascaded sub‐circuits, including (i) a serial‐parallel switched‐capacitor circuit with n c pumping capacitors and (ii) a switched‐inductor booster with m c resonant capacitors, so as to obtain the high step‐up gain of ( n c + 1) × m c /(1 − D ) at most, where D is the duty cycle of PWM adopted to enhance output regulation as well as robustness to source/loading variation. Besides, the ASN control is presented with adapting the stage number n ( n = 0, 1, 2, …, n c ) of pumping capacitors to obtain a flexible gain of ( n + 1) × m c /(1 − D ), and further in order to make the SISCC operating at a properly small duty cycle for improving switch utilization and/or supply voltage range. Some theoretical analysis and control design include formulation, steady‐state analysis, ASN‐based conversion ratio, efficiency, output ripple, stability, inductance and capacitance selection, and control design. Finally, the performance of this scheme is verified experimentally on an ASN‐based SISCC prototype, and all results are illustrated to show the efficacy of this scheme. Copyright © 2015 John Wiley & Sons, Ltd.