A coupled-inductor current-doubler topology for a power converter has first and second rectifiers and first and second coupled inductors. Each coupled inductor has a main inductor inductively coupled with a secondary inductor. The secondary inductor of the first coupled inductor is coupled in series...http://www.google.com/patents/US6982887?utm_source=gb-gplus-sharePatent US6982887 - DC-DC converter with coupled-inductors current-doubler
