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Mathematical Problems in Engineering
Volume 2015, Article ID 426315, 10 pages
Research Article

Control Design and Loop Gain Analysis of DC-to-DC Converters Intended for General Load Subsystems

School of Electronics Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea

Received 6 April 2015; Accepted 16 June 2015

Academic Editor: Gisella Tomasini

Copyright © 2015 Syam Kumar Pidaparthy and Byungcho Choi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


DC-to-DC converters are usually intended for general applications where the load impedance characteristics are unknown or undefined. This paper establishes the control design procedures for DC-to-DC converters in the absence of any prior knowledge on their load impedance. The proposed control design can be universally adapted to all the DC-to-DC converters regardless of the impedance characteristics of their actual load. This paper also presents the loop gain analysis of the converter combined with an actual load whose impedance characteristics are only available afterward. A graphical analysis method is proposed, which enables us to predict the loop gain of the converter in the presence of an arbitrary load impedance. The validity of the analysis method is demonstrated using a current-mode controlled buck converter coupled with an inductive load, capacitive load, and converter load. Theoretical predictions are verified with both computer simulations and experimental measurements.