Patent ID: 7864549

Claim:
A coupled inductor boost power converter, comprising, a first coupled inductor having a magnetically permeable core having substantial energy storage capability, having a primary winding and a secondary winding, said windings being mutually magnetically coupled, wherein said primary winding has a dotted terminal and an undotted terminal and said secondary winding has a dotted terminal and an undotted terminal, a second inductance connected in series with said first coupled inductor, a primary circuit network comprising, an input coupleable to a source of dc power, having a first terminal and a second terminal, said primary winding of said first coupled inductor, first switch means having a first terminal and a second terminal for selectively applying said source of dc power to said primary winding of said first coupled inductor, an active reset network having a first terminal and a second terminal comprising, second switch means operable substantially in anti-synchronization to said first switch means, and a first capacitor coupled to said second switch means wherein the current in said second switch means is substantially equal to the current in said first capacitor, a secondary circuit network comprising, an output coupleable to a load, having a first terminal and a second terminal, said secondary winding of said first coupled inductor, a second capacitor connected to said secondary winding of said first coupled inductor, a third capacitor connected to said output, third switch means having a first terminal and a second terminal wherein said first terminal of said third switch means is coupled to said secondary winding of said first coupled inductor and said second terminal of said third switch means is connected to said output, fourth switch means having a first terminal and a second terminal operable substantially in anti-synchronization to said third switch means wherein said first terminal of said fourth switch means is connected to said output and said second terminal of said fourth switch means is coupled to said secondary winding of said first coupled inductor, whereby substantial net energy is transferred to said secondary circuit network during an on state of said first switch means and substantial net energy is transferred to said secondary circuit network during an off state of said first switch means, the current in said primary winding of said first coupled inductor reverses direction during said off state of said first switch means, and said second inductance contributes energy to reduce the voltage difference between said first terminal of said first switch means and said second terminal of said first switch means during a turn on switching transition of said first switch means.