PWM ZERO-VOLTAGE-SWITCHING BOOST-DERIVED CONVERTERS WITH OUTPUT ISOLATION

In this paper, the basic operations and steady-state analysis for thre e modified boost derived converter topologies will be presented, Unlik e the conventional boost topology, these converters provide electrical isolation and zero-voltage switching, while having identical componen t stresses as those in the conventional boost converters, Zero-voltage switching and proper transformer-core resetting are achieved from the resonance that occurs between the parasitic capacitance of the power switch and the transformer magnetizating inductance, By introducing a lossless clamping circuit, the voltage stresses across the switching d evices are limited to the reflected output voltage to the primary side .