A　new　gate-driver　scheme　is　proposed　in　this　paper　to　improve　the　efficiency　of　the　synchronous　rectifiers　in　wide-input-voltage　range　Flyback　converter.　The　proposed　new　gate-driver　scheme　bases　on　the　auxiliary　windings　and　an　additional　control　switch,　which　connects　in　parallels　with　the　Flyback　main　circuits　and　synchronous　rectifier.　The　driving　signals　are　synchronized　properly　through　the　auxiliary　windings　of　the　power　transformer　can　optimize　MOSFET　turn-on　and　turn-off　delays　in　synchronous　rectifiers.　The　driving　signal　prevents　the　MOSFET　body-diode　to　conduct　and　continuously　adjusts　to　minimize　the　cross-conduction　time　interval.　The　operation　principle　and　experiment　results　are　presented　in　this　paper.