Combining resonant inductor and transformer into single package, LLC Transformer is available in power ranges from 100–800 W. Resonant power conversion topology minimizes switching losses by promoting zero voltage switching, minimizing unnecessary power dissipation in switches. Power dissipation can be lowered to as little as 5%, ensuring 99% transformer efficiency and 95% overall efficiency.
[source: http://news.thomasnet.com/fullstory/LLC-Transformer-provides-up-to-99-efficiency-20004972]
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