Circuit for Zero-Voltage / Zero-Current Switching of Full-Bridge DC / DC Converters

摘要

Unlike the related art, the present invention does not use a separate saturation reactor or an active element, but only a passive element on the secondary side, and enables a zero voltage / zero current switching to a switching element composed of minority carrier elements. A circuit for zero voltage / zero current switching of a bridge DC / DC converter, wherein a full bridge DC / DC converter having the present invention is installed according to the opening / closing operation of the switches S1, S2, S3, and S4 of the full bridge. Transformer (T) for inducing current and voltage on the secondary side to the secondary and tertiary sides, diodes (D1, D2, D3, D4) constituting a full bridge allowing current to flow in one direction on the secondary side, and output filters on the secondary side Full bridge rectifier (BD100), the rectifier (BD100) connected to the tertiary side of the transformer (T) as the (L _O , C _O ) and the applied load (R _O ) and other components of the present invention to rectify the current A capacitor (C100) connected between the output terminal and ground of the The diode D100 connected between the output terminal of the rectifier BD100 and the output terminal of the secondary side is also configured to achieve zero voltage / zero current switching, thereby providing a full bridge DC / DC converter according to the present invention. It is very economical because it can be implemented at low cost by not including lossy parts such as saturation reactors or expensive parts such as active devices, and can be widely used in large-capacity high frequency switching DC / DC converters because of its large capacity. It is a useful invention.