Title :
Harmonic analysis of nondeterministic switching methods for DC-DC power converters
Author :
Shrivastava, Yash ; Hui, S.Y. ; Sathiakumar, S. ; Chung, Henry Shu-Hung ; Tse, K.K.
Author_Institution :
Dept. of Electr. Eng., Sydney Univ., NSW, Australia
fDate :
6/1/2000 12:00:00 AM
Abstract :
The authors present a rigorous theoretical harmonic analysis of random pulse width modulation (RPWM) method and random pulse position modulation (RPPM) method for dc-dc converters. The theoretical relationships of discrete harmonics, continuous noise and output voltage ripple of the RPWM and RPPM schemes are established and compared with those of a standard deterministic PWM scheme in a buck converter. Limitations in the randomly switched dc-dc converters are highlighted. The theoretical predictions indicate that the randomized schemes generally have an inherent problem in achieving low output voltage ripple due to the low-frequency continuous noise within the pass-band of the converter filter. For dc-dc power conversion, the RPPM method offers much better output voltage performance than the RPWM method
Keywords :
DC-DC power convertors; PWM power convertors; harmonic analysis; pulse position modulation; DC-DC power converters; buck converter; discrete harmonics; harmonic analysis; low-frequency continuous noise; nondeterministic switching methods; output voltage ripple; random pulse position modulation; random pulse width modulation; randomly switched dc-dc converters; Buck converters; DC-DC power converters; Harmonic analysis; Power harmonic filters; Pulse modulation; Pulse width modulation; Pulse width modulation converters; Space vector pulse width modulation; Switching converters; Voltage;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
