DocumentCode :
1062296
Title :
Output capacitor stability study on a voltage-mode buck regulator using system-poles approach
Author :
Wong, Kahou
Author_Institution :
ON Semicond., Chandler, AZ, USA
Volume :
51
Issue :
8
fYear :
2004
Firstpage :
436
Lastpage :
441
Abstract :
System poles approach for pulsewidth-modulated (PWM) dc/dc converters analysis is developed making use of the sensitivity matrix. It combines both small-signal analysis for stability assessment and large-signal analysis for wide operating condition. This paper is particularly focused in stability study on the output capacitor capacitance and equivalent series resistance (ESR) in a buck regulator using the system poles approach. Using the system-poles approach in the output capacitance example it is found that unstable operating point possibly exists between two stable operating points for some conditions. Tends of stable-to-unstable or unstable-to-stable are observed by the z-domain poles movement with different changing circuit parameters. Making use of these tends, it is exemplified that the unstable operating point can be stabilized. This paper shows that output capacitance and ESR are critical to the stability and stability can be improved by modification on the output capacitor.
Keywords :
DC-DC power convertors; PWM power convertors; capacitance; capacitors; circuit stability; poles and zeros; sensitivity analysis; capacitance; dc-dc power conversion; equivalent series resistance; large-signal analysis; output capacitor stability; pulsewidth-modulated dc/dc converters; sensitivity matrix; small-signal analysis; stability assessment; system-poles approach; voltage-mode buck regulator; z-domain poles movement; Capacitance; Capacitors; Circuit stability; DC-DC power converters; Matrix converters; Paramagnetic resonance; Pulse width modulation; Pulse width modulation converters; Regulators; Voltage; Capacitance; dc–dc power conversion; stability;
fLanguage :
English
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
Publisher :
ieee
ISSN :
1549-7747
Type :
jour
DOI :
10.1109/TCSII.2004.832782
Filename :
1323228
Link To Document :
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