Modeling and analysis of a novel rectifier voltage stress mechanism

This paper presents a novel output rectifier voltage stress mechanism at light load for a phase shifted full bridge converter. The resonance between parasitic capacitor, leakage inductor and external inductor during duty cycle loss period contributes a lot to the voltage stress of the output rectifier at light load. Due to the parasitic resonance, the voltage stress of the rectifier at light load case is typically more severe than that at heavy load case. The paper explains the novel rectifier voltage stress mechanism and verifies it by experimental results.