Abstract
This paper investigates the effects of resonant tank arrangements on the common mode (CM) noise current. CM noise reduction methods with symmetrical transformer winding structure and split resonant tank are proposed for full bridge (FB) LLC converters. For half bridge (HB) LLC converters, CM noise cancellation capacitor <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$C_{can}$</tex> is proposed to fully cancel the CM noise current flowing through the transformer. The corresponding extraction and calculation techniques of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$C_{can}$</tex> are provided. Both techniques are lossless and easy to implement. The capabilities and excellence of aforementioned methods are verified by experiments.
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