论文信息 - Conducted EMI suppression by Random Carrier Frequency modulation techniques

Conducted EMI suppression by Random Carrier Frequency modulation techniques

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

[1] D. Boroyevich,et al. EMI Suppression in Voltage Source Converters by Utilizing dc-link Decoupling Capacitors , 2006, IEEE Transactions on Power Electronics.

[2] F. Mihalic,et al. Reduced Conductive EMI in Switched-Mode DC–DC Power Converters Without EMI Filters: PWM Versus Randomized PWM , 2006, IEEE Transactions on Power Electronics.

[3] D. Magnon,et al. Conducted EMI Reduction in Power Converters by Means of Periodic Switching Frequency Modulation , 2007, IEEE Transactions on Power Electronics.

[4] J. Fontaine,et al. Modeling of the power spectrum density of an entirely randomized modulation in power converters , 2003, 2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03..

[5] T.M. Jahns,et al. Development of an Active dv/dt Control Algorithm for Reducing Inverter Conducted EMI with Minimal Impact on Switching Losses , 2007, 2007 IEEE Power Electronics Specialists Conference.

[6] Hing Cheung So,et al. Analysis and spectral characteristics of a spread-spectrum technique for conducted EMI suppression , 2000 .

[7] F. Wang,et al. Frequency-domain EMI noise emission characterization of switching power modules in converter systems , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..