Characterization of Steady-State Current Ripple in Interleaved Power Converters Under Inductance Mismatches

• Published in: IEEE transactions on power electronics Vol. 29; no. 4; pp. 1840 - 1849
• Main Authors: Antoszczuk, Pablo D., Retegui, Rogelio Garcia, Wassinger, Nicolas, Maestri, Sebastian, Funes, Marcos, Benedetti, Mario
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.04.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Buck converters; Circuit properties; Current ripple; Electric currents; Electric, optical and optoelectronic circuits; Electrical engineering. Electrical power engineering; Electronic circuits; Electronics; Exact sciences and technology; Harmonic analysis; Inductance; inductance tolerance; Inductors; interleaved power converters; Magnetic devices; Power electronics, power supplies; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Semiconductors; Signal convertors; Steady-state; Switches; Switching; Switching frequency; Transformers; Transformers and inductors; Harmonic; High strength current; Current ripple; Power converter; Semiconductor materials; Phase shift; Power electronics; Topology; Experimental study; inductance tolerance; Inductor; Mismatching; Steady state; Switching; Inductance; Phase converter; High current; Analytical method; interleaved power converters; Ripple
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2013.2270005

Interleaved power converters are used in high-current applications due to their inherent reduction of semiconductors stress and total ripple. Ripple reduction is accomplished by a correct phase shifting, and the filtering improvement explained by the increase in the ripple frequency. However, these benefits are wasted, among other reasons, by the mismatch of the phase inductor value. As a consequence, differences in the ripple amplitude among phases are produced, leading to a total current ripple significantly greater than the ideal case, the loss of the cancellation points and the generation of the switching frequency component and its harmonics. The works dealing with this subject matter have focused on particular cases, such as a given number of phases, a specific converter topology, or a particular case of inductance mismatch, disregarding a general analytical approach. This paper proposes an analytical method to characterize the total ripple in steady state as a function of the duty cycle and the number of phases under any condition on inductance mismatch. Experimental results validate the proposed method.