Uses the control electrode attaching semiconductor device for the rectification circuit the convert device

摘要

PURPOSE: To obtain a power converter employing a semiconductor element equipped with control electrode in rectifying circuit thereof in order to reduce loss in which the effect of low loss can be exhibited sufficiently by allowing turn ON of the semiconductor equipped with control electrode for flywheel over the entire time interval to be turned ON. ;CONSTITUTION: A switching element 2 on the primary winding side of a transformer 3 is turned ON/OFF to induce a secondary winding voltage which is employed for turning a semiconductor element 4 equipped with control electrode for rectification and a semiconductor element 5 equipped with control electrode for flywheel alternately ON/OFF thus performing power conversion. In this regard, a capacitor 11 is additionally connected in parallel with the semiconductor element 5 with the capacitance thereof being set at a specific value. This constitution prolongs duration of flyback voltage, raises the flyback voltage above the threshold level of the semiconductor element 5 and turns the semiconductor element 5 ON over the entire time interval to be turned ON while suppressing ON voltage thereof thus realizing a low loss rectifying circuit.;COPYRIGHT: (C)1994,JPO&Japio