Abstract：Nowadays, current SWISS rectifiers commonly have issues such as hard switching and large switching stress, which seriously affect the power density. In order to improve the efficiency in high power applications and to solve the problem that lag bridge has narrow soft switching range, this paper proposed an improved topology with mid-point clamp capacitors based on the original isolated dual-phase full-bridge SWISS rectifier. Traditional full-bridge converter’s lag bridge soft switching almost relied on leakage inductance, furthermore, only large loads had soft switching condition. The topology proposed in this paper not only can independently design the transformer of the leading bridge and the lagging bridge, but also can use both the leakage inductance and the magnetizing inductance of the transformer’s primary side to assist the lagging switches’ parasitic capacitance charging and discharging, which meet the soft switching condition on light loads without adding much extra loss. This paper described the detailed working states of the circuit during the dead time of the lagging switch, and established the relationship between the circuit and the lagging soft switching. Finally, the correctness of the theoretical analysis and the feasibility of the improved topology were verified by simulation models and prototype models.
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2022, Vol. 37 
