Patent ID: 6605980
Filing Date: 2003-08-12
Classification: H02M,Y02B

Abstract:
A rectifier circuit comprising:a transformer (Ãœ) having a primary side (L1) and a secondary side (L21,L22), the primary side (L1) having a first and a second input terminal for coupling in an AC voltage signal (UE), and the secondary side comprising two secondary windings (L21,L22) which are connected to one another and to a first output terminal (VP2), the first and the second secondary winding (L21,L22) being connected by their other terminal to a first terminal of a first and second body diode (BD) of a respective first and second MOSFET (F1,F2) disposed in the forward direction, and the second terminal of the first and of the second body diode being connected to one another and to a second output terminal (VP1), it being possible for a load (LA) to be coupled between the first and second output terminals, the first and the second MOSFET (F1,F2) each has a main current path with a main current direction (HS) and an auxiliary current path disposed parallel to the main current path with an auxiliary current direction (NS) and with a respective body diode (BD) disposed therein, the main current direction (HS) and the auxiliary current direction (NS) running oppositely to one another, and a first and a second drive circuit (M1,M2,HL1,HL2) for driving the first and the second MOSFET (F1,F2) such that the current flow in the main current path is in the auxiliary current direction (NS) within a predetermined time period, the first and the second drive circuit (M1,M2,HL1,HL2) comprise a first and a second auxiliary winding (HL1,HL2) connected to the transformer (Ãœ), and a respective modification network (M1;M2) is disposed between the respective auxiliary winding (HL1;HL2) and the respective MOSFET (F1;F2) for modifying the output signal of the respective auxiliary winding (HL1;HL2).