Patent ID: 7038922

Claim:
A direct energy-transfer converter, which includes: a primary stage with at least one transformer primary winding and one controlled switch presenting conducting and non-conducting operating phases, a secondary stage including at least one secondary winding ( 10 ) of said transformer, and a synchronous rectifier ( 1 ), including: at least a first switch ( 20 ), known as the direct switch, which is self-regulated and conducting during the conducting phases of said controlled switch of the primary stage, known as the direct energy-transfer converter phases, at least a second switch ( 30 ), known as the freewheel switch, which is self-regulated and conducting during the non-conducting phases of said controlled switch of the primary stage, known as the freewheel phases, an output filter ( 5 ), where said converter possesses the first self-regulated means which are triggered as a function of the voltage at the terminals of said secondary winding ( 10 ), and applying to said second switch ( 30 ) a corresponding control voltage suitable to make the second switch ( 30 ) conduct, wherein said first self-regulated means include a first charge-transfer circuit (CTC 1 ) which is directly controlled by said voltage at the terminals of said secondary winding ( 10 ) to apply to said second switch ( 30 ) a control voltage which is more or less constant and supplied by an auxiliary voltage source (VAUX), and said first and second switches ( 20 and 30 ) are MOSFET transistors, and said charge-transfer circuit (CTC 1 ) includes: a by-pass network which includes a capacitor ( 42 ) connected in series with a resistance ( 43 ), where said resistance is connected to one end ( 14 ) of said secondary winding ( 10 ), said circuit detecting the variation in the voltage induced by said primary winding at the terminals of said secondary winding ( 10 ), and a bipolar transistor ( 40 ), known as the charge transistor, where the base of said bipolar transistor us controlled via said circuit, where the emitter of said bipolar transistor is connected to said auxiliary voltage source and where the collector of said bipolar transistor is connected to the gate of the second switch ( 30 ).