Start-Up Control to Prevent Overcurrent During Hot Swap in Paralleled DC-DC Converters

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Paralleled power systems require a hot swap which indicates the replacement of a converter module without shutting down the whole system for easy maintenance, repair, and upgrade. A practical issue for the hot swap is an overcurrent toward a newly activating module due to inevitable nonuniformity among the paralleled modules, which causes the excessive current and thermal stresses and even leads to a device failure. In this paper, by analyzing the start-up operation of a converter module during the hot swap, the reason for the overcurrent is demonstrated. Then, based on this analysis, a method increasing the voltage reference exponentially is presented, which can contribute to reduce the overcurrent. However, the overcurrent still remains and causes a problem as the number of paralleled modules or difference in output voltage set points increases. Therefore, a control scheme adjusting the output voltage reference during the start-up is proposed to eliminate the overcurrent effectively. Experimental results from 1-kW paralleled phase-shifted full-bridge converters are shown to verify the proposed works.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2013-12
Language
English
Article Type
Article
Keywords

CURRENT-SHARING CONTROL; BUCK CONVERTER; MODULES; INTERFACE; SYSTEMS; DESIGN; STABILITY; CIRCUITS

Citation

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, v.60, no.12, pp.5558 - 5574

ISSN
0278-0046
DOI
10.1109/TIE.2012.2236999
URI
http://hdl.handle.net/10203/175539
Appears in Collection
EE-Journal Papers(저널논문)
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