Conducted EMI suppression by Random Carrier Frequency modulation techniques

Author

Guo, Haiyan ; Li, Zhaoji ; Zhang, Bo ; Li, Zehong

Author_Institution

State Key Lab. of Power Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

fYear

2009

fDate

23-25 July 2009

Firstpage

693

Lastpage

696

Abstract

Random Carrier-Frequency (RCF) control mode is a new control scheme. When applied to DC/DC converters, it reduces conducted EMI significantly. However, limited theoretical studies about RCF control mode are available. In this paper, the analytical expression of the amplitude of voltage power spectra density in the RCF mode is deduced. The level of randomness is defined .The effects of the level of randomness on reducing the peak level of the power spectra density are analyzed .Theoretical predictions are confirmed with experiment. Finally special attention is given to the output voltage ripple under different spread spectrum modulation techniques.

Keywords

DC-DC power convertors; electromagnetic interference; frequency control; frequency modulation; interference suppression; spectral analysis; DC-DC converters; EMI suppression; electromagnetic interference; random carrier frequency modulation techniques; random carrier-frequency control; spread spectrum modulation techniques; voltage power spectra density; Autocorrelation; DC-DC power converters; Electromagnetic interference; Fourier transforms; Frequency modulation; Laboratories; Power electronics; Switching circuits; Switching converters; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems, 2009. ICCCAS 2009. International Conference on

Conference_Location

Milpitas, CA

Print_ISBN

978-1-4244-4886-9

Electronic_ISBN

978-1-4244-4888-3

Type

conf

DOI

10.1109/ICCCAS.2009.5250413

Filename

5250413