Analysis of CLL Voltage-Output Resonant Converters Using Describing Functions

• Published in: IEEE transactions on power electronics Vol. 23; no. 4; pp. 1772 - 1781
• Main Authors: FOSTER, Martin P, GOULD, Christopher R, GILBERT, Adam J, STONE, David A, BINGHAM, Christopher M
• Format: Journal Article
• Language: English
• Published: New York, NY Institute of Electrical and Electronics Engineers 01.07.2008; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Circuit properties; Convertors; Diodes; Electric, optical and optoelectronic circuits; Electrical engineering. Electrical power engineering; Electrical machines; Electronic circuits; Electronics; Exact sciences and technology; Magnetic devices; Power electronics, power supplies; Printed circuit boards; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Signal convertors; Simulation; Studies; Rectifier; Power converter; DC-DC power conversion; Prototype; Error estimation; Resonant circuit; Theoretical study; Power electronics; Inductor; Modeling; Operating conditions; Voltage converter; Complex impedance; Discontinuous mode; Behavioral analysis; Network analysis; Energy conversion; Equivalent circuit; System simulation; Resonant power convertors; Mathematical model; resonant power conversion; Comparative study
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2008.924835

A new ac equivalent circuit for the CLL voltage-output resonant converter is presented, that offers improved accuracy compared with traditional FMA-based techniques. By employing describing function techniques, the nonlinear interaction of the parallel inductor, rectifier and load is replaced by a complex impedance, thereby facilitating the use of ac equivalent circuit analysis methodologies. Moreover, both continuous and discontinuous rectifier-current operating conditions are addressed. A generic normalized analysis of the converter is also presented. To further aid the designer, error maps are used to demonstrate the boundaries for providing accurate behavioral predictions. A comparison of theoretical results with those from simulation studies and experimental measurements from a prototype converter, are also included as a means of clarifying the benefits of the proposed techniques. [PUBLICATION ABSTRACT]