Circle-Based Criteria for Performance Evaluation of Controlled DC–DC Switching Converters
Balestrino, A.; Corsanini, D.; Landi, A.; Sani, L.
Industrial Electronics, IEEE Transactions on
Volume 53, Issue 6, Dec. 2006 Page(s):1862 - 1869
Digital Object Identifier   10.1109/TIE.2006.885157
Summary:An experimental method is proposed to estimate all design specifications represented by circles in the Nyquist plane (e.g., phase margin, sensitivity, and closed-loop bandwidth) in case of closed-loop dc/dc switching converters. The method is based on the complete root contour (CRC) analysis in the root locus plane. All typical specifications for controller design are experimentally checked in case of a boost converter, using only input/output data. The main innovation of this paper is the automatic and systematic application of the CRC method to controlled dc-dc converters. The classic relay-based structure for an experimental estimation of the critical parameters (autotune variation) is compared with a different technique, called sinusoidal autotune variation, more efficient in the case of nonlow-pass systems

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