A 5 kW boost converter with various passive/active snubbers for reducing component stress and achieving high efficiency

This paper presents a 5 kW boost converter with various passive/active snubbers for reducing current and voltage stress, and achieving high efficiency. The proposed converter includes a clamp branch diode and capacitor, a coupling inductor, and a PWM converter to function as active clamp. As compared to a conventional boost converter with a passive inductor-capacitor-diode (LCD) snubber, the proposed has the merits of low current stress imposed on the main switch, clamped switch voltage and limited reverse recovery current. In this study, three types of active snubbers, buck, boost and flyback, are respectively implemented with a boost converter. Theoretical analysis and experimental results have verified that the proposed circuit configuration is attractive for high power applications.