Many control schemes for dc-dc converters begin with the assertion that inductor currents are "fast" states and capacitor voltages are "slow" states. This assertion must be true for power factor correction (PFC) converters to allow independent control of current and voltage. In the present work, singular perturbation theory is applied to boost converters to provide rigorous justification of the time scale separation. Krylov-Bogoliubov-Mitropolsky (KBM) averaging is used to include switching ripple effects. A relationship between inductance, capacitance, load resistance, and loss resistances derives from an analysis of an approximate model. Similar results hold for buck and buck-boost converters. An experimental boost converter and a simulated PFC boost support the derived requirement.
J. W. Kimball and P. T. Krein, "Singular Perturbation Theory for DC-DC Converters and Application to PFC Converters," Proceedings of the IEEE 38th Power Electronics Specialists Conference, 2007. PESC'07, Institute of Electrical and Electronics Engineers (IEEE), Jun 2007.
The definitive version is available at http://dx.doi.org/10.1109/PESC.2007.4342105
IEEE 38th Power Electronics Specialists Conference, 2007. PESC'07
Electrical and Computer Engineering
National Science Foundation (U.S.)
Keywords and Phrases
Averaging; Integral Manifold; Power Factor Correction; Singular Perturbation
Article - Conference proceedings
© 2007 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.