Patent ID: 6038146
Filing Date: 2000-03-14
Classification: H02M,Y02B

Abstract:
An AC-to-DC power converter, said converter comprising:two AC input terminals;an inductive element having a first set of windings with a first terminal and a second terminal, said first terminal of said first set of windings being coupled to one of said AC input terminals;a transformer having a first primary winding and a secondary winding, said first primary winding having a first terminal and a second terminal, said first terminal of said first primary winding being coupled to one of said AC input terminals and said second terminal of said first primary winding being coupled to said second terminal of said first set of windings of said inductive element;at least one DC output terminal coupled to said secondary winding;a switch having a first terminal, a second terminal, and a control terminal, said first terminal of said switch being coupled to said second terminal of said first primary winding;a capacitive element having a first terminal and a second terminal, said first terminal of said capacitive element being coupled to one of said AC input terminals and said first terminal of said first primary winding, said second terminal of said capacitive element being coupled to said second terminal of said switch; anda control circuit coupled to said control terminal of said switch, wherein said control circuit controls said switch such that when said switch is on a first current flows from one of said AC input terminals into said first terminal of said capacitive element but not said first set of windings of said inductive element while a second current flows from one of said AC input terminals through said inductive element and through said switch, and such that when said switch is off a third current flows from one of said AC input terminals into said first terminal of said capacitive element but not said first set of windings of said inductive element while a fourth current flows from one of said AC input terminals through said inductive element, through said transformer, and into said first terminal of said capacitive element.