Title :
Output impedance analysis of digitally controlled DC-DC converter
Author :
Hua Wang ; Hua Lin ; Xing Li ; Xingwei Wang
Author_Institution :
State Key Lab. of Adv. Electromagn. Eng. & Technol., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
In this paper, the effect of digital control on output impedance converter is analyzed. The continuous time equivalent model is used to describe the digital control system in voltage mode, then output impedance is derived by small-signal model. The time delay caused by digital control is considered to analyze output impedance. The analysis indicates that digital control sharpens the peak of output impedance which appears near the crossover frequency, the factors which affect the peak are presented. Experimental results verified the theoretical analysis.
Keywords :
DC-DC power convertors; continuous time systems; delays; digital control; frequency control; frequency convertors; impedance convertors; voltage control; continuous time equivalent model; crossover frequency; digitally controlled dc-dc converter output impedance analysis; time delay; voltage mode small-signal model; Delay effects; Digital control; Impedance; Mathematical model; Modulation; TV; Voltage control;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2014 IEEE
Conference_Location :
Pittsburgh, PA
DOI :
10.1109/ECCE.2014.6953804
