A zero-voltage-transition soft switching converter

摘要

A zero-voltage-transition soft switching converter (14) for converting a DC voltage comprises a load output terminal (13); a main switching bridge comprising at least one main switch (S; S) and an auxiliary circuit (15) connected to the main switching bridge. The auxiliary circuit comprises an auxiliary switch (SX1); auxiliary diodes (D, D) connected to positive and negative DC voltages and to a diode connection point; and a coupled inductor (T) having two coupled windings (L; L), connected between the load output terminal and the auxiliary switch and the diode connection point, respectively. The auxiliary circuit is connected to the main switching bridge to block currents in one direction between the main switching bridge and the auxiliary circuit, a residual magnetizing current otherwise freewheeling through a turned-on main switch and an auxiliary diode is reset in each switching cycle and thus no longer accumulated.