Analyses of the Impact of Current Load Change on a Current-Mode Constant On-Time Buck Converter Regulator
Journal
IEEE Energy Conversion Congress and Exposition (ECCE)
Pages
2005-2012
Date Issued
2014-09
Author(s)
Abstract
For recent energy-saving computer power converter products, it's required to provide a very tightly regulated voltage under very stringent current load change conditions. In this paper, this issue is dealt with for a current-mode constant on-time buck converter. An issue about beat frequency effects analysis is first given using modulation spectrum theory and small-signal frequency-domain model. This analysis provides insight into the complexity of the issue. Then a time-domain approach is used to derive converter output voltage ripple in terms of converter load current excitation. The results are verified in experiments. A mathematical solution is established for estimating the worst-case output ripple voltage due to repetitive large-step AC load current excitation of wide-range frequencies. © 2014 IEEE.
Subjects
Adaptive voltage position (AVP); Constant on-time control; Current mode control; Output voltage ripple; Voltage regulator (VR)
SDGs
Other Subjects
Energy conservation; Frequency domain analysis; Time domain analysis; Voltage regulators; Adaptive voltage; Current Mode Control; Mathematical solutions; Modulation spectrum; On-time controls; Output voltage ripple; Signal frequencies; Time-domain approach; DC-DC converters
Type
conference paper