Input filter influence on the control stability of DC/DC converters

• Published in: 2004 IEEE International Symposium on Industrial Electronics Vol. 2; pp. 1165 - 1171 vol. 2
• Main Authors: Louati, K., Sadarnac, D., Karimi, C.
• Format: Conference Proceeding
• Language: English
• Published: Piscataway NJ IEEE 2004
• Subjects: Applied sciences; Attenuation; Buck converters; Circuit properties; Circuits; DC-DC power converters; Electric, optical and optoelectronic circuits; Electrical engineering. Electrical power engineering; Electrical machines; Electromagnetic compatibility; Electronic circuits; Electronic mail; Electronics; Exact sciences and technology; Filters; Inductors; Information, signal and communications theory; Power electronics, power supplies; Regulation and control; Signal convertors; Stability; Switching converters; Telecommunications and information theory; Voltage; Continuous mode; Electric transformer; Power converter; Up converter; Control system; Direct current convertor; Electromagnetic compatibility; Power electronics; DC-DC power convertors; Step down convertor; Dimensioning; Discontinuous mode; Regulation(control); Current mode; Electromagnetic interference; Frequency converter
• ISBN: 9780780383043; 0780383044
• DOI: 10.1109/ISIE.2004.1571978

Today, almost all converters have an input filter to control EMI/EMC. For most, the sizing of the filter is depending on the required attenuation from the applicable standard. For some standard that leads to very large attenuation, the input filter has more attenuation than the output filter. This study shows the interaction of the input filter and the converter regulation on both aspects of the equations and the physical understanding. We also propose a method to stabilize the whole system (filter, converter and control) without over sizing. Three basic DC/DC converter structures (the buck, the boost and the buck-boost converters) with and without transformer are studied in both modes: discontinuous current mode and continuous current mode.