Power conversion device with synchronous rectifier driving and voltage oscillation limitation during a discontinuous operating mode

摘要

A power conversion device (10) is described, having:a first and second input terminal (T1,T2), connected to a transformer winding (2), and at least an output terminal (OUT),at least a first and second synchronous rectifier (SR1,SR2), associated to the first and second input terminals (T1,T2) respectively;at least an inductor (L1) comprised in an output stage and inserted between the first input terminal (T1) and the output terminal (OUT);a driving circuit (3) having at least a first and second output terminal (N4,N5) connected to respective control terminals of the first and second synchronous rectifiers (SR1,SR2).;Advantageously according to the invention, the power conversion device comprises an adjustable threshold control block (4) inserted between the device first and second input terminal (T1,T2) and connected to the inductor (L1), the control block (4) being enabled on the low level of a control signal (OUTGate1) on the first output terminal (N4) of the driving circuit (3).A control method of a synchronous rectifier comprised in a power conversion device is also described.