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Start-Up Control to Prevent Overcurrent During Hot Swap in Paralleled DC–DC Converters | IEEE Journals & Magazine | IEEE Xplore

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


Abstract:

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...Show More

Abstract:

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.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 60, Issue: 12, December 2013)
Page(s): 5558 - 5574
Date of Publication: 31 December 2012

ISSN Information:


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