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Overcurrent protection for the LLC resonant converter with improved hold-up time

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5 Author(s)
Figge, H. ; Power Electron. & Electr. Drives, Univ. of Paderborn, Paderborn, Germany ; Grote, T. ; Fröhleke, N. ; Böcker, J.
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The LLC resonant converter topology enables high DC-DC conversion efficiency and has been recently adopted for power supplies in several application areas. In this paper a method for overcurrent protection of the LLC resonant converter is proposed, which avoids a reduction of the hold-up time resulting from the application of the protection scheme. The discussion covers the operation principle, design aspects and a detailed analysis of the circuit operation. Finally measurements on a prototype are presented showing an improvement in the hold-up time of up to 83%.

Published in:

Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE

Date of Conference:

6-11 March 2011