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Lower switching losses with LLC resonant topology

Posted: 02 Feb 2009     Print Version  Bookmark and Share

Keywords:Resonant converters  LLC  switching losses 

Resonant converters have been around for a long time. However, only now are they seeing increased acceptance as controllers become more available and there is an absolute need to improve efficiency. The LLC resonant topology allows for zero voltage switching of the main switches thereby dramatically lowering switching losses and boosting efficiency. Efficiencies of 93 to 96 per cent can be achieved with LLC resonant converters. This paper will describe the operation of the LLC resonant topology and illustrate how such high efficiencies can be attained.

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