What are the advantages of LLC resonant converters?

LLC resonant converters offer high efficiency through soft-switching: zero-voltage switching (ZVS) for primary MOSFETs across load range and zero-current switching (ZCS) for secondary rectifiers at resonance. The resonant tank (inductor Lr, magnetizing inductance Lm, capacitor Cr) shapes current for soft commutation. Operation above resonance maintains ZVS; frequency modulation controls output. Advantages include: high efficiency (>95%), low EMI (sinusoidal currents), and ability to hold up output during brief input loss. Common in server power supplies and EV charging.