Lossless snubber circuit for soft switching of booster ac / dc converters and full bridge dc / dc converters

摘要

INDUSTRIAL APPLICABILITY The present invention can be applied to a booster AC / DC converter or a bidirectional DC / DC converter. In the self-snubber circuit constituted by connection of simple circuit elements, power supplied to supply or DC-The present invention relates to a booster AC / DC converter for turning on and off a switching element in a circuit for interrupting a current in a zero voltage / zero current state and a lossless snubber circuit for soft switching of the bidirectional DC / The applied snubber circuit is constituted such that a current transformer diode Dp and a snubber capacitor Cr connected in series to a conventional booster converter are connected in parallel to the input boost inductor Lb of the converter and the current diode Dp A snubber diode Dr and a snubber inductor Lr are connected in series between a connection point of the rectification part FD and the connection point of the rectifier part FD and the snubber capacitor Cr, The additional connected small input capacitor (Cin) allows the switching of the main switching element in the converter, without its own power loss for the soft switching of the applied converter, when applied to a booster AC / DC converter or bidirectional DC / DC converter Loss, reverse recovery loss of the reflux diode, and EMI (Electro-Magnetic Interference) due to parasitic oscillation