Voltage Disturbances and Inrush Current of DC Power Supplies
DOI:
https://doi.org/10.24084/repqj08.503Abstract
The potential damaging effects of high inrush currents
occurring after power quality disturbances on switch-mode dc
power supplies (SMPS’) have been reported, but have not been
studied in detail. This paper presents a new analytical model for
the accurate representation and calculation of inrush currents of
low-power SMPS devices. This model is verified against
previously developed circuit-based simulation model and
compared with the only other analytical model available in
existing literature. The developed analytical model is also used
to investigate device protection co-ordination, in order to
demonstrate two important effects of high-inrush current:
nuisance tripping of protection and damage of internal SMPS
components.
Key words. Inrush current, load modelling, analytical
representation, switch-mode dc power supply (SMPS), power
quality disturbance, short interruption, voltage sag
