Full-bridge resonant soft switching device

The utility model discloses a full-bridge resonant soft switching device, which comprises an advance arm, a lag arm, a capacitor in parallel connection with the advance arm and a capacitor in parallel connection with the lag arm, wherein all electronic components constitute a full-bridge resonant circuit; in the resonant circuit, a primary stage of an auxiliary transformer T2 is connected in parallel to a primary stage or a secondary stage or a secondary-stage auxiliary winding of a main transformer T1 by means of the primary connection among a capacitor C5, a saturated inductor Ls and the main transformer T1 as well as the secondary output of the main transformer T1, and the secondary stage of the auxiliary transformer T2 is externally connected with a rectifying circuit D1 and is further connected with a load. The full-bridge resonant soft switching device disclosed by the utility model is reasonable in structure, the power consumption of the circuit of the auxiliary transformer is low in a power conversion