EMI-Filter Interactions in a Buck Converter

Author

Hankaniemi, Mikko ; Karppanen, Matti ; Suntio, Teuvo

Author_Institution

Tampere University of Technology/Institute of Power Electronics, Tampere, Finland

fYear

2006

fDate

Aug. 30 2006-Sept. 1 2006

Firstpage

54

Lastpage

59

Abstract

The paper investigates the effects of EMI filter in the dynamics of a buck converter. It is shown theoretically that the EMI filter may increase significantly the load sensitivity of the voltage-mode-controlled converter but the peak-current-mode-controlled converter is quite insensitive to the EMI filter interactions. Experimental validations are carried out using a buck converter under three different control modes - voltage-mode, peak-current-mode and output-current-feedforward peak-current-mode control. The investigations show that the phenomenon causing the instability under peak-current-mode control is the negative-resistorÂ¿oscillation (NRO) phenomenon, and confirm also the excess EMI-filter sensitivity of the voltage-mode controlled converter.

Keywords

Buck converters; Electromagnetic compatibility; Electromagnetic interference; Filters; Integrated circuit modeling; Open loop systems; Stability; Switching converters; Transfer functions; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Motion Control Conference, 2006. EPE-PEMC 2006. 12th International

Conference_Location

Portoroz

Print_ISBN

1-4244-0121-6

Type

conf

DOI

10.1109/EPEPEMC.2006.4778375

Filename

4778375