Title :
EMI reduction of power supplies by Bi-Frequency modulation
Author :
Zhang, Y.F. ; Yang, L. ; Lee, C.Q.
Author_Institution :
Power Electron. Res. Lab., Illinois Univ., Chicago, IL, USA
Abstract :
In this paper, a new control (modulation) technique, called Bi-Frequency control, is proposed. By operating the converters at two fixed switching frequencies with a modulation frequency to adjust the duration ratio, the emission spectrum of the control signal is spread and the spectral power level is reduced. The spectral analysis of the Bi-Frequency control signal is given, and the spectral comparison between PWM and Bi-Frequency control is presented. A Bi-Frequency controlled buck ZVS converter is breadboarded to confirm the operation of the Bi-Frequency control
Keywords :
electromagnetic interference; frequency control; interference suppression; modulation; power convertors; power supplies to apparatus; spectral analysis; switching circuits; Bi-Frequency controlled buck ZVS converter; Bi-Frequency modulation; DC/DC converter; EMI reduction; PWM; control signal; duration ratio; emission spectrum; fixed switching frequencies; power supplies; spectral analysis; spectral power level reduction; zero voltage switching; Electromagnetic interference; Frequency conversion; Frequency modulation; Lighting control; Power supplies; Pulse width modulation; Size control; Spectral analysis; Switching converters; Switching frequency;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 1994. APEC '94. Conference Proceedings 1994., Ninth Annual
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-1456-5
DOI :
10.1109/APEC.1994.316343
