DocumentCode :
51938
Title :
Advanced Control for Very Fast DC-DC Converters Based on Hysteresis of the {C}_{out} Current
Author :
Huerta, Santa C. ; Soto, Andres ; Alou, Pedro ; Oliver, Jesus A. ; Garcia, O. ; Cobos, Jose A.
Author_Institution :
Toronto Rehabilitation Institute, University of Toronto, Madrid, Canada
Volume :
60
Issue :
4
fYear :
2013
fDate :
Apr-13
Firstpage :
1052
Lastpage :
1061
Abstract :
The bandwidth achievable by using voltage mode control or current mode control in switch-mode power supply is limited by the switching frequency. Fast transient response requires high switching frequency, although lower switching frequencies could be more suitable for higher efficiency. This paper proposes the use of hysteretic control of the output capacitor (C_{out}) current to improve the dynamic response of the buck converter. An external voltage loop is required to accurately regulate the output voltage. The design of the hysteretic loop and the voltage loop are presented. Besides, it is presented a non-invasive current sensor that allows measuring the current in the capacitor. This strategy has been applied for DVS (dynamic voltage scaling) on a 5 MHz buck converter. Experimental results validate the proposed control technique and show fast transient response from 1.5 V to 2.5 V in 2 \\mu{\\rm s} .
Keywords :
Bandwidth; Capacitors; Current measurement; Impedance; Stability analysis; Transient response; Voltage control; DC-DC power conversion; dynamic response; non-linear circuits; transient response;
fLanguage :
English
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
Publisher :
ieee
ISSN :
1549-8328
Type :
jour
DOI :
10.1109/TCSI.2012.2209308
Filename :
6324397
Link To Document :
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