Title :
Loop model and quasi limit cycle for digitally controlled switching dc-dc converters
Author :
Li, Feng ; Wei, Tingcun ; Yan, Han ; Zheng, Ran
Author_Institution :
Sch. of Comput. Sci. & Technol., Northwestern Polytech. Univ., Xi´´an, China
Abstract :
Loop model and controlled object model for digitally controlled switching dc-dc converters are set up in this paper, and buck converters stability for both digital control and analog control are comparatively analyzed based on the proposed models. This paper also discusses the presence of one oscillation, called as quasi limit cycle, caused by one additional switching cycle delay in the digital feedback loop, and three methods to remove it are introduced and studied. Simulation results are provided to verify the correctness of proposed models and the validity of removal methods.
Keywords :
DC-DC power convertors; digital control; feedback; oscillations; switching convertors; analog control; buck converters stability; controlled object model; digital feedback loop; digitally controlled switching dc-dc converters; loop model; oscillation; quasilimit cycle; switching cycle delay; Converters; Modulation; limit cycle; pulse-width modulation; switching dc-dc converter;
Conference_Titel :
Computer Application and System Modeling (ICCASM), 2010 International Conference on
Conference_Location :
Taiyuan
Print_ISBN :
978-1-4244-7235-2
Electronic_ISBN :
978-1-4244-7237-6
DOI :
10.1109/ICCASM.2010.5620226