A high-frequency, power converter circuit including a transformer for transforming electrical current and having a primary; at least one secondary winding of a first type, and at least one secondary winding of a second type. The secondary windings of said first and second types are in flux-coupling relationship...http://www.google.fr/patents/US4455596?utm_source=gb-gplus-shareBrevet US4455596 - Flyback-forward boost switchmode converter
