HIGH EFFICIENCY SOFT SWITCHING AC-DC BOOSTER CONVERTER USING COUPLED INDUCTOR HAVING POWER FACTOR CORRECTING FUNCTION AND ENERGY REGENERATING CIRCUIT

摘要

PURPOSE: A high efficiency soft switching AC-DC booster converter is provided to significantly reduce electromagnetic interference by reducing stresses of blocking diode, while reducing harmonic distortion. CONSTITUTION: A high efficiency soft switching AC-DC booster converter comprises a booster inductor(Lb) for receiving a DC voltage through a primary coil, and which has a secondary coil operating as a voltage source; a leakage inductor(LL) connected to the secondary coil of the booster inductor, and which limits the current being applied from the secondary coil; an auxiliary switching element(Q2) connected to the secondary coil of the booster inductor through the leakage inductor, and zero-current switched by the current limitation of the leakage inductor; a main switching element(Q1) which is zero-voltage switched when the current flowing by the switching operation of the auxiliary switching element reaches the current flowing at the primary coil of the booster inductor; and a blocking switching element which is switched during turn-off of the main switching element, such that the current flowing through the main switching element charges a resonance capacitor and provides a current path.