DocumentCode :
1905274
Title :
Characterization and performance comparison of digital V2-type constant on-time control for buck converters
Author :
Cheng, Kuang-Yao ; Yu, Feng ; Mattavelli, Paolo ; Lee, Fred C.
Author_Institution :
Center for Power Electron. Syst., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
fYear :
2010
fDate :
28-30 June 2010
Firstpage :
1
Lastpage :
6
Abstract :
This paper characterizes two digital V2 control schemes using for the buck converters with small-ESR capacitors based on the presented small-signal models. Due to the sampling effects of the analog-to-digital converters (ADCs), the digital V2 control system performances are not as good as the analog ones, even using the inductor current sensing feedback. The major issue is that in order to stabilize and to make the system well-damped, large external ramps or large current sensing gains are required. However, with such large ramp compensations, some benefits of the V2 control architecture, including the fast transients and the easily compensation, will be vanished. In this paper, a hybrid-ramp compensation concept is presented to improve the system performance. Both small-signal modeling analyses and simulation verifications are given. And the load transient experimental results with different ramp compensations are also shown in this paper.
Keywords :
DC-DC power convertors; analogue-digital conversion; digital control; power system control; voltage control; V2 control architecture; analog-to-digital converters; buck converters; digital V2-type constant on-time control; hybrid-ramp compensation concept; inductor current sensing feedback; large current sensing gains; load transient; ramp compensations; sampling effects; small-ESR capacitors; small-signal modeling analyses; small-signal models; system performance; Capacitors; Gain; Impedance; Inductors; Load modeling; Sensors; Transfer functions; DC-DC buck converter; Digital control; V2 control; constant on-time control; small-ESR capacitors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Control and Modeling for Power Electronics (COMPEL), 2010 IEEE 12th Workshop on
Conference_Location :
Boulder, CO
Print_ISBN :
978-1-4244-7462-2
Electronic_ISBN :
978-1-4244-7461-5
Type :
conf
DOI :
10.1109/COMPEL.2010.5562404
Filename :
5562404
Link To Document :
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