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Improved control‐to‐output characteristics of a PWM buck‐boost converter
Author(s) -
Lo YuKang,
Chen JunTing,
Lin ChungYi,
Ou ShengYuan
Publication year - 2011
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.624
Subject(s) - duty cycle , pulse width modulation , control theory (sociology) , buck converter , comparator , transfer function , voltage , buck–boost converter , boost converter , computer science , control (management) , engineering , electrical engineering , artificial intelligence
An indirect control variable for improving the control‐to‐output characteristics of a Pulse Width Modulation (PWM) buck‐boost converter is introduced in this letter. The voltage gain and the small‐signal model of the buck‐boost converter are reviewed. The actual voltage command at one input of the PWM comparator is from the proposed indirect control variable and the peak value of the high‐frequency PWM carrier. The resulted voltage gain function appears proportional to this indirect control command. Also the dependence of the DC gain of the control‐to‐output transfer function on the duty cycle is eliminated. Experimental results conform well to the theoretical analysis. Copyright © 2010 John Wiley & Sons, Ltd.